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#1621: Why does the time-stamp look wrong in Microsoft Excel?

Excel displays our time stamp incorrectly.  If you were to open the data file in Notepad you would see the correct time format.  To correct the data in Excel, Highlight all of column A, right click on the highlighted region and select Format Cells.  Under the Number tab select Custom, Scroll to the bottom of the list that appears and select “m/d/yyyy h:mm”.  You will need to add “:ss.000” to the end of this, so it looks like this “m/d/yyyy h:mm:ss.000” .  Setting the cells to this will give you the highest resolution that Excel can show.

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#1616: Can I change the time zone of data collected?

We use Universal Coordinated Time (UTC) to collect data on all of our devices.  There is no provision to set the time to a local time zone. 

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#1611: Which Integrated Electronics Piezoelectric (IEPE) accelerometers work with the IEPE-Link-LXRS?

The IEPE-Link™ -LXRS® accepts inputs from most IEPE sensors using the industry standard 10-32 mini-coaxial connector and 2.3 mA constant current excitation.

 

 

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#1606: How do I set the 3DM-RQ1-45 back to its default settings?

Using MIP Monitor software, to reset the device to the factory defaults:

  • Establish communication as normal with the sensor.
  • Click Settings.
  • Click Load Default Settings and a message box pops up.
  • Click OK and the message box disappears.
  • Click Settings again.
  • Click Save Current Settings and a message box pops up.
  • Click OK and the message box disappears.

This process does not erase any hard and soft iron calibration that may be on the device.

The Hard and Soft Iron Cal software we provide must be used to do that.

 

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#1571: What PPS signal is supported on the 3DM-GX3-25?

The input specification for PPS on the 3DM-GX3-25 standard and OEM  is LVTTL (low voltage TTL), 5 volt tolerant.

The -25 has a power regulator that will protect up to 15 volts.

 

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#1568: How do I set the 3DM-GX4 back to its default settings?

Using MIP Monitor software, to reset the device to the factory defaults:

  • Establish communication as normal with the sensor.
  • Click Settings.
  • Click Load Default Settings and a message box pops up.
  • Click OK and the message box disappears.
  • Click Settings again.
  • Click Save Current Settings and a message box pops up.
  • Click OK and the message box disappears.

This process does not erase any hard and soft iron calibration that may be on the device.

The Hard and Soft Iron Cal software we provide must be used to do that.

 

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#1567: How do I set the 3DM-GX3 back to its default settings?

Using MIP Monitor software, to reset the device to the factory defaults:

  • Establish communication as normal with the sensor.
  • Click Settings.
  • Click Load Default Settings and a message box pops up.
  • Click OK and the message box disappears.
  • Click Settings again.
  • Click Save Current Settings and a message box pops up.
  • Click OK and the message box disappears.

This process does not erase any hard and soft iron calibration that may be on the device.

The Hard and Soft Iron Cal software we provide must be used to do that.

 

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#1551: Does the ENV-Link Mini support wind speed and wind direction indicators?

Yes. The ENV-Link-Mini provides support for wind speed and wind direction indicators.

An example of instruments that have been proven are:

Wind Speed: http://inspeed.com/anemometers/Vortex_Wind_Sensor.asp

Wind Direction: http://inspeed.com/wind_speed_direction/e-Vane_2.asp

 

 

 

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#1550: Is there a self-test for the backplane of the analog base station?

There is no self-test function on the WSDA-Base-101 Analog Base Station to test the analog outputs.

However, each channel can be tested by using whatever wireless node you have.

Using Node Commander software, confirm that any given channel on whatever wirelees node you have is working.

From there, reconfigure the sensor channel with Node Commander so that the output in Node Commander is VOLTS.

Again using Node Commander, direct the sensor output in VOLTS to each of the output channels on the backplane of the analog base station.

Using your DAQ, multi-meter or other analog measurement system, confirm that the analog voltage output matches the digital voltage output as reported by Node Commander.

 

 

 

 

 

 

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#1549: How do I write previously saved hard and soft iron calibration coefficients back to my 3DM-GX3?

Our MIP Monitor software, as written, will not allow you to save the 12 hard and soft iron calibration coefficients to a file, and then read that file back into the software to rewrite the values to the inertial sensor.

However, you cand accomplish the task by recording the values that are displayed (or take a screen grab).

This would be followed by using the data communications protocol EEPROM Write command to write the values back into the device.

This would require either a terminal program or the ability to write software, an understanding of how to construct the command packets, and a list of the EEPROM addresses involved.

Please contact your Lord MicroStrain support engineer for further details.

 

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#1545: What is the difference between the Internal and External GPS selector in MIP Monitor software?

The Internal or External GPS selector refers to the function that allows the user to turn off the on-board GPS and use a computer to send GPS updates to the device.

If you are using the internal GPS, always select ‘Internal’.

Refer to the data communications protocol if you intend to supply external GPS.

MIP Monitor software also has a test function that allows you to input user selected GPS parameters.

 

 

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#1544: What is the Float function in the analog pairing screen of Node Commander?

In Node Commander software, on the analog pairing screen, there is a check box for "Float". What is the function of this check box?

If the node is configured to send data to the base station in floating point mode, you need to enable this checkbox and set the 0-3 volt scaling.

 

 

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#1543: What inertial data quantities are available in the WSDA-RGD?

The WSDA-RGD (with internal GX3 inertial sensor) is configured to produce the following messages on startup.

GPS Data (1 Hz):

  • UTC Time
  • LLH Position
  • NED Velocity

AHRS Data (100 Hz):

  • Euler Angles

From this output the WSDA logs:

GPS (1 Hz):

  • latitude
  • longitude
  • height above ellipsoid
  • height above MSL
  • horizontal accuracy
  • vertical accuracy
  • speed

AHRS (100 Hz):

  • roll
  • pitch
  • yaw

The WSDA-RGD does not log any data until it gets a valid time, if it is set to get time from GPS only it will not log any output from the GX3 until the UTC timestamp from the GX3 is valid, even though the GX3 is producing valid AHRS data.

This data is not user configurable and is not available as a live stream through LiveConnect.

 

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#1542: How do I calculate the battery life for a wireless node?

As a general rule, you can calculate the battery life of a wireless node by dividing the amp hours of charge on the battery by the amps consumed during sampling.

Using the V-Link-LXRS as an example, we read in the data sheet (http://files.microstrain.com/V-Link_LXRS_datasheet.pdf) that the internal rechargeable battery has a nominal charge of 650 mAh (milliamp hours).  We next go to the V-Link-LXRS power profile (http://files.microstrain.com/V-Link-LXRS-Power-Profile.pdf) and we read that the V-Link-LXRS consumes 12.816 mA when sampling a 350 ohm strain gauge on 1 channel at 128 Hz.  By dividing 650 mAh by 12.816 mA, we find that the battery will last approximately 50 hours before needing recharge.

 

 

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#1541: I have an older wireless node. Will this node work with my newer LXRS base station?

Yes!

However, new LXRS functions such as synchronized sampling, beaconing, etc. will not be available for your older node.

 

 

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#1525: How will the 3DM-GX3-35 work with the magnetometers turned off?

Without the magnetometer, the only heading reference is from the GPS and this heading reference can only be used on a platform that has some constant lateral motion.  This is the only way GPS can get a good heading.   Once a heading reference is obtained (either magnetometer or GPS heading) it can be maintained for a short time (less than 30 seconds typically) with just the gyroscopes.  This, of course, would have to be done through a fusion filter external to the -35.  The LORD MicroStrain 3DM-GX3-45 product actually has this functionality built-in.

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#1512: What is the difference between SINGLE BYTE and MIP protocol?

The main difference between single byte (SB) and MIP is as follows:

  • All MIP commands and data have a header and checksum.  SB only has a header (the echo of the command byte) and a checksum on the replies.  This means that the programmer has to create a header and calculate the checksum for a command before s/he sends the command.  This was not necessary with SB.
  • MIP setup and control commands (like start and stop continuous mode) send an ACK/NACK field with a reply.  SB does not.  The ACK/NACK field has an error code that can be used to confirm that a command was accepted.
  • MIP packets can contain multiple command and data fields.  SB commands and data only have one fixed field.

The reason we created MIP was the higher reliability for communications and control, plus the ability to have custom data messages.  SB was prone to phantom commands in a noisy environment.  In addition, SB had a limited number of data combinations available.

To move code from Single Byte to MIP with simple applications is fairly painless if you follow some guidelines.

  • You can “prebuild” all your setup and control commands and make them constants in your code.   You can plug the prebuilt packet constants into the same part of the code that you previously used to send a single byte command (In essence, you are sending a “multi-byte” command instead of a single byte command).  We have a “packet builder” tool in the MIP Monitor that will build the packet for you.  You can try out the command and then copy the packet and paste it directly into your code as a string constant.
  • When you design the MIP data message, make sure all the “data rate decimation” values are the same.  This will make all the data packets identical, which makes finding data in the packet similar to finding data in a SB data message (by using fixed offsets).

 

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#1508: What is the impedance on the GPS connector?

The impedance on the GPS connector is 50 ohms.

The 3DM-GX3 provides 3 volts power on the center pin of the connector (active antenna).

 

 

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#1506: How can I adjust the Low Pass Filter on the signal conditioner cards?

The DEMOD-DVRT and the DEMOD-DVRT-TC signal conditioners both have a Low Pass Filter.

http://www.microstrain.com/displacement/demod-dvrt

http://www.microstrain.com/displacement/demod-dvrt-tc

The filter is described as: 2 pole, active Butterworth, 3 dB down @ 800 Hz standard; factory adjustable 10 Hz-8 Khz

The filter is modified by manipulating resistors on the circuit board.

Resistors may either be removed or added or both.

These resistors may go into standoff sockets or require soldering/desoldering on the circuit board surface.

After the rework is done, good practice dictates that the signal conditioner and its paired sensor be recalibrated to reflect changes in noise characteristics.

We recommend that such work be done here at the factory.

 

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#1505: What is the ECCN for the 3DM-GX3?

The ECCN is 7A994.

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#1491: Why are radio channels 25 and 26 missing on my wireless sensor data aggregator (WSDA gateway)?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

 

 

 

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#1490: Why are radio channels 25 and 26 missing on my wireless base station?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

 

 

 

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#1489: Why are radio channels 25 and 26 missing on my wireless node?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

With the introduction of our LXRS radio technology, and its accompanying increase in radio strength and signal distance, the channel 25 radio frequency (2.475 GHz) and the channel 26 radio frequency (2.480 GHz) created harmonics on the edge of the Zigbee band that precludes their use.

All wireless products, both older and new, continue to support 14 channels running from channel 11 to channel 24.

 

 

 

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#1488: What radio frequency is my wireless sensor data aggregator (WSDA gateway) on?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

If you are mixing new nodes and base stations with older nodes and base stations, please be cognizant of these different channel settings.

The Node Discovery function of Node Commander will help you sort out which nodes are on what channels; Node Discovery is channel independent and allows the base station to communicate with any node, no matter what channel it is on

Sampling methods such as synchronized sampling, low duty cycle, network broadcast, etc. require that all nodes are on the same frequency so you will want to insure that you have adjusted the channels settings of the nodes to suit.

 

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#1487: What radio frequency is my wireless base station on?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

If you are mixing new nodes and base stations with older nodes and base stations, please be cognizant of these different channel settings.

The Node Discovery function of Node Commander will help you sort out which nodes are on what channels; Node Discovery is channel independent and allows the base station to communicate with any node, no matter what channel it is on

Sampling methods such as synchronized sampling, low duty cycle, network broadcast, etc. require that all nodes are on the same frequency so you will want to insure that you have adjusted the channels settings of the nodes to suit.

 

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#1486: What radio frequency is my wireless node on?

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

If you are mixing new nodes and base stations with older nodes and base stations, please be cognizant of these different channel settings.

The Node Discovery function of Node Commander will help you sort out which nodes are on what channels; Node Discovery is channel independent and allows the base station to communicate with any node, no matter what channel it is on

Sampling methods such as synchronized sampling, low duty cycle, network broadcast, etc. require that all nodes are on the same frequency so you will want to insure that you have adjusted the channels settings of the nodes to suit.

 

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#1485: Where do I find the Smart Motherboard software user manual?

Click here.

 

 

 

 

 

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#1484: How do I use the Smart Motherboard RS-232 communication interface with my laptop?

The Smart Motherboard has a standard RS-232 9-pin communication interface.  It can be used with any computer that has a USB port by employing a serial-to-USB adapter.

These are readily available from:

IOGear http://www.iogear.com/product/GUC232A/

Radio Shack http://www.radioshack.com/product/index.jsp?productId=12755098&utm_source=Google&utm_medium=PPC&utm_term=55053626&utm_content=Exact&utm_campaign=PLA&{ifmobile:ds_dest_url=http%3A%2F%2Fm.radioshack.com%2Fradioshack%2Fproduct%2Fdetail.do%3FitemId%3d12755098%26utm_source%3dGoogle%26utm_medium%3dPPC%26utm_term%3d55053626%26utm_content%3dExact%26utm_campaign%3dPLA}&cagpspn=pla&gclid=CICa0v6Y6bgCFQrS4AodE1MAAA&gclsrc=ds.ds

Staples http://www.staples.com/Staples-USB-to-Serial-Adapter/product_837560

Belkin http://www.belkin.com/us/p/P-F5U409

...and many others.

Be sure to load the driver so that the adapter is recognized by the computer operating system.

 

 

 

 

 

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#1483: How do I enter the Slope and Offset calibration into Smart Motherboard software?

As an example. here is the Quick Start Guide for the M-DVRT-9: http://files.microstrain.com/Micro_Sub_DVRT_Quick_Start_Guide.pdf

Page 7 refers to the Slope and Offset that you will need to enter into the Smart Motherboard software.

In the Smart Motherboard software, click Tools.

Click Configuration and the Configuration screen appears.

Select the appropriate channel (remember that each channel, i.e., each DVRT and DEMOD –DVRT signal conditioner card in the Smart Motherboard is calibrated separately) by checking the Channel check box.

Select the Linear Radio Button.

Enter the Slope and Offset in the number scroll boxes.

Select None in the Peak Detect drop-down.

Change the Units from Volts to mm (for millimeters) by wiping through with your mouse.

Click File.

Click Save As Default.

Click File.

Click Return and you are ready to sample in millimeters.

 

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#1482: Can I field calibrate a gauging DVRT?

The MG-DVRT Microminiature Gauging and SG-DVRT Subminiature Gauging Differential Variable Reluctance Transducers are typically calibrated with their signal conditioning electronics at the factory. These calibrations are highly accurate and are always recommended. However, under certain conditions the user may determine that a field calibration should be performed. This technical note provides a step-by-step instruction to field calibration and assumes the user is familiar with the DVRT displacement transducer and its signal conditioning electronics (Motherboard, Smart Motherboard, or DEMOD-DC).

Click here.

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#1481: How do I handle a Smart Motherboard error that says the "tabctl32.ocx run-time component is missing"?

A run-time component named ' tabctl32.ocx' has not been automatically registered with your Windows system for some reason.

Let’s register it manually:

Download the component http://download.microstrain.com.s3.amazonaws.com/component.zip.

Unzip the file.

Copy the component into the following folder on your computer: C:\WINDOWS\system32.

Click the Windows Start.

Click Run.

The Run window will appear.

Cut and paste (or type) this command into the Open drop-down box: regsvr32 c:\windows\system32\tabctl32.ocx

Click OK and you will receive a confirming message that the component has been registered.

Click OK in the message box.

Now try your Smart Motherboard application and the error will have been cured.

 

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#1480: How do I upgrade the firmware on my GX3 inertial sensor?

From time to time, MicroStrain releases firmware upgrades for its 3DM-GX3® inertial sensors. These firmware upgrades represent operating improvements, new functions, etc. In most cases, the user may download these upgrades and perform the upgrade using a simple step-by-step process. This technical note describes which firmware upgrades may be accomplished by the user and which firmware upgrades must be done at the factory. Familiarity with 3DM-GX3® operation is assumed. The upgrade procedure employs a Microsoft Windows computer and the Microsoft HyperTerminal utility.

Click here.

 

 

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#1479: Can I use the 3DM-GX3-35 with a Campbell Scientific datalogger?

Yes. We provide sample code for the Campbell Scientific CR1000 and CR3000 dataloggers.

Click here and navigate to the Sample Code on the Documentation tab.

 

 

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#1478: Can I use the 3DM-GX3-45 with Bluetooth?

The LORD MicroStrain 3DM-GX3-45 high-performance, miniature GPS-Aided Inertial Navigation System (GPS/INS) combines MEMS inertial sensors, a highly-sensitive embedded GPS receiver, and a complex Extended Kalman Filter to generate optimal position, velocity, and attitude (PVA) estimates. It is currently available with RS-232 and USB communication interfaces. A wireless communication interface can easily be added by employing off-the-shelf Bluetooth RS-232 adapters.

Click here.

 

 

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#1477: Can I use dataloggers with the inertial sensors?

Many inertial applications incorporate dataloggers. The datalogger can take many forms: hardware or software, analog or digital, simple or complex, and/or combinations of all. For our purposes, let’s work through a simple-digital-software datalogger. In this case, datalogger software is installed on a computer. The inertial sensor is connected to the computer via an RS-232 communication interface. The inertial sensor is pre-programmed to automatically send data when powered. The computer receives the stream of data and the datalogger software continuously records the stream to a data file.

Click here.

 

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#1476: How can I program the inertial sensor so that it outputs on start-up?

The LORD MicroStrain 3DM-GX3 inertial sensor family allows the user to pre-program the inertial sensor so that it continuously outputs specific data packets at specific sampling rates each time it is powered on. This functionality facilitates integration of the inertial sensor with other equipment and systems. For example, connection of the 3DM-GX3 inertial sensor to a datalogger becomes quite easy. The user pre-programs the 3DM-GX3 data output settings on his desktop, connects the 3DM-GX3® to the datalogger’s RS-232 port, powers the 3DM-GX3, and the datalogger records the inertial data. This technical note assumes some familiarity with your particular 3DM-GX3 inertial sensor and its accompanying MIP Monitor (Windows-based) software.

Click here.

 

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#1475: How do I output a 4 to 20 mA current loop with the analog base station?

The LORD MicroStrain® WSDA-Base-101-LXRS Wireless Analog Output Base Station supports all data acquisition sessions between wireless nodes and host computers including Synchronized Sampling (both Continuous and Burst modes), Armed Datalogging, Datalogging, Streaming and Low Duty Cycle. As an integral feature, the WSDA-Base-101-LXRS has an analog output back panel that supports analog data acquisition equipment (DAQs). Up to 8 sensor channels from one or multiple wireless nodes can be fed into a DAQ with simultaneous digital feed into a PC, or into a DAQ with the PC removed (stand-alone configuration). Each channel on the back panel has a 0 to 3 volt range representing the particular sensor’s full scale output. In some environments and with some equipment, the 0 to 3 volt range is not appropriate; many types of programmable logic controllers (PLCs) and DAQs have only current loop inputs, are therefore incompatible with voltage output sensors, and require a 4 to 20 mA output range to operate. This technical note demonstrates how to convert the 0 to 3 volt output to a 4 to 20 mA output using a third party converter and assumes familiarity with the WSDA-Base-101-LXRS, LORD MicroStrain wireless nodes and Node Commander software.

Click here.

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#1474: How do I measure small voltage with a wireless node?

The LORD MicroStrain V-Link-LXRS Wireless 7 Channel Analog Input Sensor Node supports a wide range of Wheatstone bridge and analog sensors including acceleration, vibration, strain, load cells, torque, pressure, magnetic fields, displacement, geophones, etc. As a basic function of support for these sensors, the V-Link-LXRS is measuring small voltages. This technical note demonstrates how to measure a voltage within a +/-20 mV range on channels 1 through 4 and assumes some familiarity with the V-Link-LXRS and Node Commander software. The technical note goes on to demonstrate measurement of other small voltage ranges.

Click here. 

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#1473: How do I measure small current with a wireless node?

The LORD MicroStrain V-Link-LXRS Wireless 7 Channel Analog Input Sensor Node and the SG-Link-LXRS Wireless 2 Channel Analog Input Sensor Node support a wide range of Wheatstone bridge and analog sensors including acceleration, vibration, strain, load cells, torque, pressure, magnetic fields, displacement, geophones, etc. As a basic function of support for these sensors, the nodes measure small voltage. The nodes can actually be repurposed to measure small current. This is useful, for example, if one wanted to add the wireless capability of the nodes to a 4 to 20 mA sensor. This technical note assumes some familiarity with the V-Link-LXRS, SG-Link-LXRS and Node Commander software, and uses a 4 to 20 mA pressure transducer for its example.

Click here. 

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#1472: How do I control a relay with a wireless node?

The LORD MicroStrain® V-Link-LXRS Wireless 7 Channel Analog Input Sensor Node and the SG-Link-LXRS Wireless 2 Channel Analog Input Sensor Node support a wide range of Wheatstone bridge and analog sensors including acceleration, vibration, strain, load cells, torque, pressure, magnetic fields, displacement, geophones, etc. As a basic function of support for these sensors, the nodes provide +3 volt DC excitation to the sensor circuit. The excitation is initiated when the node is instructed to sample. Because the excitation turns on and turns off as the sampling turns on and turns off, a relay can be switched on and off, and used to control another component in a system. For example, a motor could be turned on and off to coincide with the sensor sampling. This technical note assumes some familiarity with the V-Link®-LXRS, SG-Link-LXRS and Node Commander® software.

Click here.

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#1471: How do I use a 4 to 20 mA pressure transducer with V-Link-LXRS and SG-Link-LXRS?

The LORD MicroStrain V-Link®-LXRS Wireless 7 Channel Analog Input Sensor Node and the SG-Link®-LXRS Wireless 2 Channel Analog Input Sensor Node support a wide range of Wheatstone bridge and analog sensors including acceleration, vibration, strain, load cells, torque, pressure, magnetic fields, displacement, geophones, etc. As a basic function of support for these sensors, the nodes measure small voltage. The nodes can actually be repurposed to measure small current. This is useful, for example, if one wanted to add the wireless capability of the nodes to a 4 to 20 mA sensor. This technical note assumes some familiarity with the V-Link-LXRS, SG-Link-LXRS and Node Commander software, and uses a 4 to 20 mA pressure transducer for its example.

Click here.

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#1443: The plunger of my DVRT is too long, can I cut it?

Yes, but you must be sure to cut the correct end or the plunger will not work and must be replaced.

1.       The M-DVRT plunger has a smaller diameter wire protruding from the end that is not inserted into the DVRT body.  This is the end that can be cut.  Another way to determine the correct end is to insert the plunger into the DVRT and observe the output.  If you get an output change, do NOT cut that end, as it is the end with the ferrite, and the plunger will no longer work if this end is cut.  You can use a pair of wire cutters to cut the M-DVRT plunger.

2.       The S-DVRT plunger looks like it is plugged at one end and hollow at the other end.  The plugged end is the end with the ferrite: do NOT cut that end.  Again, another way to determine the correct end is to insert the plunger into the DVRT and observe the output.  If you get an output change, do NOT cut that end, as it is the end with the ferrite, and the plunger will no longer work if this end is cut.  You can use a dremel tool to cut the S-DVRT plunger.

When cutting the plungers, keep in mind that you want some length of plunger protruding from the DVRT for mounting when it is fully compressed.

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#1424: Is the 3DM-GX3-35 GPS PPS (pulse per second) signal available to outside devices?

The GPS PPS signal is available on pin 7. It can drive one high impedance TTL input.

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#1380: How can I get NMEA data packets from the inertial sensor?

NMEA packets can be had by putting the 3DM-GX3-35 or 3DM-GX3-45 in GPS Direct mode and manipulating the devices with the GPS manufacturer’s software.

Here are two technical notes which show how this is done:

http://files.microstrain.com/8401-0017-Using-u-blox-Software-3DM-GX3-35-3DM-GX3-45.pdf

http://files.microstrain.com/8401-0013-Outputting-NMEA-Packets-to-GPS-Ready-Software.pdf

NMEA packets can also be generated in the user's own application by gathering the navigation data output by the 3DM-GX3-35 or 3DM-GX3-45 and formatting it into NMEA packets. The inertial sensor feeds navigation data to the host computer, the host computer formats the navigation data into NMEA packets, and sends them out the serial port to a NMEA-ready device.

 

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#1370: Does Node Commander work on a smart phone?

No.  Node Commander is a Windows software which requires a standard version of the XP Pro, Vista, Win 7 or Win 8 operating system.  Smart phones do not have these standard operating systems installed.

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#1369: What operating systems and computing platforms support Node Commander?

Node Commander is a Windows software which will operate on XP Pro, Vista, Win 7 and Win 8.  Any computing platform, whether desktop, laptop, tablet, etc. which supports these standard Windows OS can be used for Node Commander.

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#1362: Where can I acquire plastic shim stock for field calibrating the Non-Contact DVRT?

Plastic shims and shim stock can be acquired from industrial supply houses.

McMaster-Carr offers assortments as shown below.

These may be found at: www.mcmaster.com

Part Number: 9513K42
Type Shim Stock
Material Plastic
Material Type PETG and Polyester
Length x Width 5" x 20"
Specifications Met Not Rated
Assortments Standard Shim Stock
Assortments
Assortment Type Plastic Assortment - 15 Piece
Assortment Contents 1 each of these thicknesses:
.0005", .00075", .001",
.0015", .002", .003", .004",
.005", .0075",
.010" (±10%); .0125",
.015" (±.001"); .020",
.025", .030" (±5%).

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#1361: How long is the cable for the GPS antenna?

The GPS antenna cable that ships with every 3DM-GX3-35 and 3DM-GX3-45 is 3 meters in length.

Cable length is important.  The longer the cable, the lower the signal strength.  If the user lengthens the cable, the signal strength will diminish.  The loss of signal strength can only be empirically determined by trying out a particular installation.  Loss of signal strength will manifest itself in the number of satellites seen, quality of data reception from satellites, etc.

 

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#1360: Does the GPS receiver use Differential GPS?

No.  The GPS Receiver only receives standard GPS signals.  It does not receive Differential GPS (DGPS) signals.  If the user requires DGPS input, the GX3 will accept DGPS via an external feed and in the case of the 3DM-GX3-45, incorporate it in its Kalman filter processing.  To be clear: the on-board GPS will be bypassed in favor of the external GPS.

Wikipedia GPS: http://en.wikipedia.org/wiki/Global_Positioning_System

Wikipedia DGPS: http://en.wikipedia.org/wiki/Differential_GPS

 

 

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#1359: Does one billing plan apply to all of my devices?

Each device has its own billing plan.  This allows the user to upgrade critical devices to prevent service disruption, and select the plan most appropriate for each device's usage pattern.  Each upgraded device will have its own base charge, and accumulate additional usage charges based on its plan.
 

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#1358: What happens if I use all of my available MDP and/or OpenData API allotment?

When devices on the basic plan reach their maximum MDP, SensorCloud will reject any further data uploads.  Similarly, API calls will be rejected after the allotment is exhausted.  All previously uploaded data remains accessible through fastgraph.  For upgraded devices, SensorCloud will not reject any requests, but will accumulate additional usage costs.  These additional costs are defined in each of the billing plans.  Additional costs will appear at the end of the month when the billing cycle is renewed.
 

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#1357: What is SensorCloud's billing cycle?

Each SensorCloud billing plan operates on a monthly cycle.  The month begins when the user enters their billing info.  A user can upgrade and downgrade devices at any time in the month.  Upgrades made during a billing cycle will be pro-rated for the remaining days in the billing cycle.  At the end of the billing cycle, all upgraded devices are automatically renewed and MDP and OpenData API allotments are refreshed.
 

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#1356: Can the 3DM-GX3-45 be coupled with RTK?

No, the on-board GPS does not support this.... but if the user has a GPS that does, this external GPS can input its 'RTK-groomed' measurements into the 3DM-GX3-45 and the 3DM-GX3-45 will incorporate those measurements into the Kalman filter.  To be clear: the on-board GPS will be bypassed in favor of the external GPS.

Wikipedia's definition: http://en.wikipedia.org/wiki/Real_Time_Kinematic

Real Time Kinematic (RTK) satellite navigation is a technique used to enhance the precision of position data derived from satellite-based positioning systems, being usable in conjunction with GPS, GLONASS and/or Galileo. It uses measurements of the phase of the signal′s carrier wave, rather than the information content of the signal, and relies on a single reference station to provide real-time corrections, providing up to centimetre-level accuracy. With reference to GPS in particular, the system is commonly referred to as Carrier-Phase Enhancement, or CPGPS. It has application in land survey and in hydrographic survey.

 

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#1355: Can I get data collected by Node Commander software into SensorCloud?

Yes.  Node Commander has a function that allows the user to drag and drop its CSV data files into SensorCloud.

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#1354: Can I view my data from a mobile device?

Yes, absolutely.  SensorCloud is viewable on Android and IOS devices.

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#1353: How can I process raw sensor data into more sophisticated engineering values?

SensorCloud has a very powerful function called MathEngine.  MathEngine allows users to process vast quantities of sensor data in the cloud, and on the fly.   Users can either create simple custom scripts for basic operations such as averaging and filtering, or, they can implement advanced data processing algorithms for generating condition indicator metrics such as metal fatigue or bearing failure.  

Link to MathEngine: http://www.sensorcloud.com/features/mathengine

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#1352: Can I share my data with other users?

Yes, absolutely.  You are the administrator of your account and you can grant password protected read or read/write access to anyone you like.  Anyone who has access to a web browser can graphically see your data.  You can also send automatic alerts to anyone you like.

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#1351: Once my data is in SensorCloud, am I able to get it out of SensorCloud?

Yes, absolutely.  The SensorCloud interface allows you to manually download a CSV (spreadsheet file) on any data set you choose.  You may also download any data set programmatically using the calls in the OpenData API.

Link to OpenData API: http://www.sensorcloud.com/features/open-data-api

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#1350: I like the functions of SensorCloud but I want to host it in my own data center. May I do that?

No. SensorCloud is designed around Amazon Web Services.

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#1349: Is data secure and private on SensorCloud?

Security and data privacy are paramount at SensorCloud.  Security has been a cornerstone of our platform from day one, and all services adhere to industry best practices.  SensorCloud is currently built on top of Amazon Web Services, which provides a world-class secure and trusted platform with well-documented processes and exceptional physical security.

Link to our Security and Privacy statement: http://www.sensorcloud.com/features/security-privacy

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#1348: What does a terabyte of time series data look like?

Sensors generating vast quantities of data.  This video demonstrates how SensorCloud can rapidly plot and navigate through a one terabyte (TB) vibration data set containing over 100 billion measurements. 

 

Link to video: http://www.youtube.com/watch?feature=player_embedded&v=T6tko2wOJc4

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#1347: Does SensorCloud alert the customer when certain events occur?

SensorCloud Alerts allow users to create custom email and SMS text message alerts for monitoring data exceedances and events of interest.

  • Flexible and powerful syntax for generating custom alert messages with embeddable event data parameters.
  • Customizable email "From" field allows users to manage and respond to alert replies.
  • Trigger alert on sensor channel exceedances
  • Trigger alerts on sensor channel inactivity

Link to Alerts Documentation: http://www.sensorcloud.com/documentation/alert-documentation

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#1346: Do I have to use LORD MicroStrain® wireless sensor equipment to utilize SensorCloud?

Absolutely not.  Certainly LORD MicroStrain® equipment is optimized for SensorCloud use but any-web connected sensor, source or platform can send its channelized data to SensorCloud and take advantage of its functions.  Any network enabled device that supports HTTPS communication can upload to SensorCloud!  We provide a complete OpenData API for the developer or will provide a customized solution meeting the customer’s needs.

Link to OpenData API: http://www.sensorcloud.com/features/open-data-api

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#1345: How is SensorCloud priced?

To get started with SensorCloud, we offer a free BASIC account with:

  • 3 Million Data Points Per Month
  • Unlimited Total Data Storage
  • 1 Custom Alert
  • 1 User Login
  • 50,000 OpenData API Calls per Month

As your needs increase, we have many plans to suit.  Here is a link to pricing: http://www.sensorcloud.com/pricing

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#1344: How much data can I store?

Data storage is actually unlimited.  With a free BASIC account, you may upload up to 3 million data points per month with unlimited total storage.  With a PREMIUM account, you may upload up to 5 million data points a month with unlimited total storage.  With a PRO account, you may upload up to 50 million data points a month with unlimited total storage.  Larger plans are also available. Here is a link to pricing: http://www.sensorcloud.com/pricing

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#1343: What is the maximum data upload rate for SensorCloud?

SensorCloud is capable of uploading a maximum of 5000 samples per second per channel to an unlimited number of channels.

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#1342: How do I repair or return a LORD MicroStrain® product?

In order to return any LORD MicroStrain® product either for repair or return, you must contact us for a Return Merchandise Authorization number (RMA). If you purchased directly from LORD MicroStrain® in the United States, please contact your Sales or Support Engineer to obtain an RMA.  If you purchased directly from a LORD MicroStrain® distributor, please contact your distributor to obtain an RMA.

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#1340: Where do I purchase LORD MicroStrain® products?

If you are located in the United States, LORD MicroStrain® supplies you directly.  If you are in located in another country, LORD MicroStrain® products are available exclusively from LORD MicroStrain® distributors.  Please use this locator to determine your distributor: http://www.microstrain.com/support/international

Direct link: view

#1339: Does LORD MicroStrain® provide a trial period for its products?

To enable customers to try our standard products risk free, LORD MicroStrain® offers a 30 day return on the purchase of a starter kit. In order to take advantage of this offer, a purchase order or payment for the starter kit is required when the order is placed. 30 day trial details may be found at: http://www.microstrain.com/support/warranty

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#1338: How do I get support for my LORD MicroStrain® products?

LORD MicroStrain® Support Engineers are always available to support you in any way we can by phone, email, SKYPE or Live Chat from our home page.  Contact details may be found at: http://www.microstrain.com/support/contact-support

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#1337: What is the shipping policy for LORD MicroStrain® products?

LORD MicroStrain® insures all products shipments to their full value unless the customer specifically states a different method.

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#1336: What is the warranty for LORD MicroStrain® products?

LORD MicroStrain® warrants its standard products to be free from defective material and workmanship for a period of one (1) year from the original date of purchase.  Warranty details may be found at: http://www.microstrain.com/support/warranty

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#1335: What cables are needed to operate the 3DM-DH3?

The 3DM-DH3 is operated by a combination RS-422 communication and power cable, part number 4005-0003.

 

 

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#1334: What cables are needed to operate the FAS-A?

The FAS-A is operated by a combination RS-232 communication and power cable, part number 6208-0020.

The FAS-A analog out port uses an analog cable with flying leads, part number 6208-0010.

 

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#1333: What cables are needed to operate the 3DM-DH?

The 3DM-DH is operated by a combination RS-232 communication and power cable, part number 6202-0020.

A technical drawing can be found at: http://files.microstrain.com/3010-0008.pdf

 

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#1332: What cables are needed to operate the 3DM?

The 3DM is operated by a combination RS-232 communication and power cable, part number 6202-0020.

A technical drawing can be found at: http://files.microstrain.com/3010-0008.pdf

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#1331: What is the difference between static and dynamic accuracy?

The term ‘static’ accuracy refers to measurements made when the inertial unit is not moving and the on-board orientation algorithm has recovered from any sensor over-ranging.

The term ‘dynamic’ accuracy refers to measurements made while the inertial unit is moving and not exceeding the measurement range of the individual on-board sensors (accelerometers, gyroscopes, magnetometers).

The 3DM, 3DM-DH and FAS-A are designed to measure static rotations.

The 3DM-GX3 family is designed to measure both static and dynamic rotations.

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#1330: How do I make the data file timestamp human readable in Microsoft Excel?

Microsoft Excel displays the timestamp contained in the wireless node data files incorrectly.  If you were to open the CSV file with Microsoft Notepad, you will see that the timestamp is shown properly.  In order to get Excel to show the human readable time, follow the below procedure:

  • Highlight all of column A (column with the timestamp)
  • Right click on highlighted region and select Format cells...
  • Select the Number Tab in the window that open and choose Custom from the Category box
  • Scroll to the bottom of the list in the Type box, find this entry: m/d/yyyy h:mm and click it
  • Add to the entry an :ss.000 so it now looks like this: m/d/yyyy h:mm:ss.000
  • Click OK

The timestamp will now be correct.

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#1329: When does the inertial sensor need recalibration?

From time to time the inertial sensor may need recalibration.

Example: If the inertial sensor contains magnetometers, coming in contact with magnetic influences (magnets, motors, etc.) may cause residual magnetism to be picked up by the on-board components which alter the calibration.  In these cases, the inertial sensor should be returned to the factory for recalibration.

Example: The inertial sensor receives a severe shock, slightly altering the position of the circuit boards in relation to the enclosure, again altering the calibration.  In these cases, the unit should be returned to the factory for recalibration.

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#1328: Is the 3DM calibrated?

Yes.  The unit is factory calibrated and ready for use with power-up.

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#1327: Is the 3DM-DH calibrated?

Yes.  The unit is factory calibrated and ready for use with power-up.

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#1326: Is the 3DM-DH3 calibrated?

Yes.  The unit is factory calibrated and ready for use with power-up.

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#1325: How is the 3DM-DH3 deployed in the drill string?

Physically, the 3DM-DH3 is easily mounted into the drill string using its body’s threading attachments. It can be tethered to an RS-422 communication cable for continuous real-time measurements to a host computer during drilling operations, or it can be remotely deployed and run as a datalogger, with data retrieval after it has been run through the drill path. The unit can be powered through the communication cable tether from a platform source or by batteries.

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#1324: What is the measurement accuracy of the 3DM-DH3?

The 3DM-DH3 has measurment accuracy of +/-0.2 degrees inclination and +/-0.5 degrees azimuth.

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#1323: What is the communication interface to the 3DM-DH3?

The 3DM-DH3 has a four-wire full-duplex RS-422 serial communication interface.

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#1322: Does software come with the 3DM-DH3?

Yes.  A Windows XP/Vista/7 compatible software is shipped the product.  The software allows the user to configure, operate, display and save data from the sensor.

 

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#1321: Within what temperature range will the 3DM-DH3 operate?

The 3DM-DH3 will operate within a temperature range of - 40 degrees C to 125 degrees C.

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#1320: What drill path measurements does the 3DM-DH3 provide?

The 3DM-DH3 provides accurate drill path measurements including Inclination, Azimuth, GTF, MTF, Dip Angle, sensor temperatures, G-TOT and H-TOT.

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#1319: Does the FAS-A have an analog output option?

Yes.  The FAS-A comes with an analog output cable and will output its pitch and roll measurements as a linearly proportional voltage (0 to 4.096 volts full scale).

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#1318: What are the data quantities that the FAS-A can output?

The sensor can output pitch and roll.

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#1317: What are the data quantities that the 3DM-DH can output?

The sensor can output:

  • acceleration
  • magnetic fields
  • Euler angles (pitch, roll, yaw)
  • orientation matrix
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#1316: What are the data quantities that the 3DM can output?

The sensor can output:

  • acceleration
  • magnetic fields
  • Euler angles (pitch, roll, yaw)
  • orientation matrix
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#1315: Does software come with the FAS-A?

Yes.  A Windows XP/Vista/7 compatible software is shipped the product.  The software allows the user to configure, operate, display and save data from the sensor.

 

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#1314: Does software come with the 3DM-DH?

Yes.  A Windows XP/Vista/7 compatible software is shipped the product.  The software allows the user to configure, operate, display and save data from the sensor.

 

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#1313: Does software come with the 3DM?

Yes.  A Windows XP/Vista/7 compatible software is shipped the product.  The software allows the user to configure, operate, display and save data from the sensor.

 

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#1312: Is the FAS-A programmable by the user?

Yes.  A complete data communications protocol manual and sample code is shipped with the sensor.

 

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#1311: Is the 3DM-DH programmable by the user?

Yes.  A complete data communications protocol manual and sample code is shipped with the sensor.

 

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#1310: Is the 3DM programmable by the user?

Yes.  A complete data communications protocol manual and sample code is shipped with the sensor.

 

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#1309: What is the measurement accuracy of the 3DM?

The 3DM can measure static and quasi-dynamic rotations with an accuracy of:

  • pitch +/-0.7 degrees (typical)
  • roll +/-0.7 degrees (typical)
  • yaw +/-1.5 degrees (typical)

 

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#1308: What is the measurement accuracy of the 3DM-DH?

The 3DM-DH can measure static and quasi-dynamic rotations with an accuracy of:

  • pitch +/-0.7 degrees (typical)
  • roll +/-0.7 degrees (typical)
  • yaw +/-1.5 degrees (typical)

 

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#1307: What is the measurement accuracy of the FAS-A?

The FAS-A can measure static and quasi-dynamic rotations with an accuracy of +/-0.7 degrees typical.

 

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#1306: What is the Euler angle measurement range of the FAS-A?

The FAS-A can measure 360 degrees in single axis mode and +/-70 degrees in dual axis mode.

 

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#1305: What is the Euler angle measurement range of the 3DM-DH?

The 3DM-DH is a 3-axis orientation sensor capable of measuring:

  • -180˚ to + 180˚ of yaw (heading)
  • -180˚ to +180˚ of roll
  • -90˚ to +90˚ of pitch (see note following)

Note: The 3DM-DH has a pitch range of +/-90˚.  It will measure pitch accurately within this range.  However, due to a mathematical singularity in the Euler theorem, as pitch exceeds either -70˚ or +70˚, the yaw and roll measurements of the 3DM-DH will become numerically unstable.  So to put it another way, if you are just measuring pitch with the device, all measurement between -90˚ and +90˚ will be accurate.  If you are measuring pitch and roll at the same time (for example), pitch measurements beyond -70˚ or + 70˚ will effect the accuracy of the roll.

 

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#1304: Does the EH-Link come with ready to use software?

Yes.  The EH-Link is shipped with Node Commander software which enables immediate out-of-the-box operations with the host computer.

 

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#1303: Does the EH-Link communicate wirelessly with its host computer?

Yes.  The EH-Link has an on-board radio which operates in the 2.4 GHz direct sequence spread spectrum and is license-free worldwide.  The radio has a radiated power of 0 dBm (1 mW) and a range of 70 meters line-of-sight.  The EH-Link communicates with a base station that is connected to the host computer.

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#1302: What on-board sensors are on the EH-Link?

The EH-Link has the following on-board sensors:

  • triaxial accelerometer
  • relative humidity and temperature sensor
  • external single channel differential (Wheatstone bridge) input
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#1301: Can the EH-Link use a piezoelectric source (harvester)?

Yes.  Here is a detailed technical note on the subject: http://files.microstrain.com/tech_notes/PZT_TN_Rev0.2.pdf

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#1300: Can the EH-Link use a thermoelectric generator (harvester)?

Yes.  Here is a detailed technical note on the subject: http://files.microstrain.com/tech_notes/Thermal_TN_Rev0_1.pdf

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#1299: Can the EH-Link use a solar harvester?

Yes.  Here is a detailed technical note on the subject: http://files.microstrain.com/tech_notes/Indoor_Solar_TN_Rev0_1.pdf

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#1298: What is the EH-Link Pioneer Kit?

The EH-Link Pioneer Kit, LORD MicroStrain® part number 6320-0041 includes 1 EH-Link wireless sensor node, 1 solar demo harvester and 1 TEG demo harvester, enabling users to set up an Energy Harvesting demo in minutes.

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#1297: What is Gyro Bias?

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#1296: How does the 3DM-GX3-45 work?

Here is a link to the 3DM-GX3-45 Theory of Operation: http://files.microstrain.com/3DM-GX3-45_Theory_of_Operation.pdf

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#1295: What is the 3DM-GX3-45 accuracy?

Kalman Filter Performance

Typical position accuracy †

±2.5 m RMS horizontal, ±5 m RMS vertical

Typical velocity accuracy †

±0.1 m/s to ±0.75 m/s RMS (application and settings dependent)

Typical attitude accuracy †

±0.35 deg RMS roll &

† RMS values generated from actual vehicle testing (airborne & land) when compared to a reference navigation unit

Attitude and Heading (AHRS)

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

GPS Receiver

GPS velocity accuracy

0.1 m/sec

GPS heading accuracy

0.5°

GPS horizontal position accuracy

< 2.5 m Autonomous

< 2.0 m SBAS (CEP, stationary 24 hours, SEP 3.5 m)

GPS timepulse signal accuracy

30 nsec RMS

< 60 nsec 99%

 

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#1294: What is the 3DM-GX3-35 accuracy?

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

 

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#1293: What is the 3DM-GX3-15 and 3DM-GX3-15 OEM accuracy?

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

Important note: Unlike the -25, the -15 does not contain magnetometers.  Magnetometers measure Earth's magnetic fields and provide the AHRS with a reference to produce an accurate heading.  In the -15, the heading is accurate from moment to moment but drifts over time and should not be relied upon.

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#1291: How do you change the radio channel on a wireless node and wireless base station?

Changing a radio channel on your wireless node and wireless base station is accomplished through Node Commander software.  Follow the four step process outlined below to update your radio channel (frequency) setting.  Note that radio channels on both your wireless node and wireless base station must match to establish network communication.

To change node/base station radio channel:

  1. Right-click Base Station/Node.
  2. Click Configure. 
  3. Click Frequency.
  4. Click Channel, e.g. 24 (2.470 GHz).
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#1189: How much network bandwidth does a WSDA-1000 use when uploading to SensorCloud?

Uploads to SensorCloud are typically dominated by the data content, with minor additional overhead for secure communications.   One simple method to estimate upload bandwidth is to multiply the number of samples to be uploaded by 12 bytes.   Each uploaded sample contains an 8 byte field for the timestamp, and a 4 byte field for the value.   Example:  If you have three nodes with one channel active all sampling at 32 Hz, your effective upload rate would be 96 samples per second.    Multiplying by 12 bytes per sample, this amounts to 1,152 bytes per second.  This amounts to 2,985,984,000 bytes over the course of a month, or approximately 2.78 GB.

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#1183: Can the WSDA-Base-101 be powered by USB and the 12 Pin header at the same time?

Yes, the WSDA-Base-101 can indeed be powered by both power sources at the same time.  The base station will use whatever power source has the higher voltage.

Please refer to page 29 of the WSDA-Base-101 user manual: http://files.microstrain.com/WSDA-Base-101-Analog-Output-Base-Station-User-Guide.pdf

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#1142: What is the rate at which data is downloaded from a wireless node's memory?

The wireless node's effective download rate is ~9.2 kBps, or 73.6 kbps.  In perfect wireless conditions, a node's full 2MB memory can be downloaded in approximately 3.7 minutes.  While 250 kbps is the radio transmission rate, there are others variables that factor into the effective download rate including memory read time, packet overhead, radio acknowledgments, and base station to PC communication.   

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#1116: Can the 3DM-GX3-45 generate a data file for Precise Point Positioning (PPP) – post GPS processing?

In a word, no.  Precise Point Positioning is a Global Navigation Satellite System (GNSS) positioning method to calculate very precise positions up to few centimeter level using a single (GNSS) receiver in a dynamic and global reference framework like International Terrestrial Frame (ITRF).  The 3DM-GX3-45 is not capable of this precision.

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#1099: What is the input impedance of the harvester input on EH-Link?

The input impedance is dependent on the programmed sample rate, the transmit rate, and how many and what type of sensors are enabled. As can be seen from the product datasheet, there are 3 different harvester/generator inputs, and a myriad of programmable operating modes to accommodate varied harvesters and energy environments.

The most commonly used harvester input is the Piezo input, an ultra-efficient switchmode converter. Figure 1 below clearly demonstrates the capability of the EH-Link versus different wireless transmit rates. Figure 1 shows test results where the applied voltage was 7.5V, a 1000 ohm Wheatstone bridge is being measured, and the transmit rate and packet payload size were varied. In this test the sample rate is fixed at one sample per second. The number of measurements saved up for transmission was varied from 1 to 30, where at 1 a single measurement was transmitted over the wireless link once per second. At 30 in this test, 30 measurements are accumulated and transmitted every 30 seconds. This is done to demonstrate that much less power is used to sample than to transmit. It is important to note that even at 30, the data sample timing is preserved and no data are missed in the received measurement stream.

Another harvester input, the 'ultra low voltage' input, is very low impedance and is intended for thermoelectric generators and thermopiles, which have very low voltage and relatively high output current. The input impedance on this input is on the order of 6 ohms, and varies a little with operating mode. With our demo TEG harvester is able to sustain continuous sampling at 64 samples per second and one transmission per second with a temperature differential of only 8 degrees Celsius between the mounting surface and the heat sink on the cool side.

The third input is an ultra high impedance AC type intended for use with high voltage piezo materials where the capacitance of the piezo is discharged at a threshold of approximately 130V peak. This is done to maximize the 'V' term in the capacitive energy equation (one half C*V squared). This input is somewhat experimental but has been shown to be very high efficiency and very high (>1 megohm) input impedance before the discharge threshold is reached, making it ideal for use with high voltage piezo ceramics.

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#1065: What is the maximum cable length between a DVRT and its DEMOD signal conditioner?

If you are using the standard cable type supplied with the DVRT sensors, 20 feet is the maximum for M-DVRT and MG-DVRT, and 60 feet is the maximum for S-DVRT, SG-DVRT and NC-DVRT. If you require longer cable lengths, LORD MicroStrain® can provide custom cables of lower resistance.

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#1064: Does carbon fiber affect the analog output from the DVRT?

No, carbon fiber has not been shown to pose a problem.

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#1063: Can we provide a drill bit and tap for threaded body DVRTs?

Yes, as a courtesy, LORD MicroStrain® will provide an appropriate drill bit and tap to match the DVRT's thread size at a nominal charge.

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#1062: How do I use the calibration documents provided with each DVRT?

In most cases, MicroStrain calibrates every DVRT with its accompanying electronics and provides a detailed calibration certificate. The certificate provides 3 methods of calibration and all the particulars including formulas to resolve voltage into engineering units.

  • Standard Least Squares Linear Fit provides a simple mathematical method to convert sensor output to displacement and delivers reasonable accuracy.
  • Polynomial Fit provides a more mathematically intensive method to convert sensor output to displacement and in turn delivers a high degree of accuracy. A possible drawback to some users of this method may be that it can not accurately report measurements beyond its stroke length (i.e., over-stroking).
  • Multi-Segment Linear Fit provides the most mathematically intensive method to convert sensor output to displacement, delivers a high degree of accuracy and is not subject to the drawback of over-stroking.
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#1061: What are the major benefits of a DVRT over an LVDT?

  • Body length to stroke ratios for DVRTs are typically 2.5 to 1 as compared to 6 to 1 for LVDTs.
  • Microminiature DVRTs are available in body diameters of only 1.5 mm (.060") and with core diameters of only 0.5 mm (.020"); this makes them the World's smallest commercially available linear displacement transducers.
  • DVRTs maintain their temperature stability due to the use of two coils arranged differentially.
  • Each DVRT is capable of submersion as a standard feature.
  • Each DVRT can be hermetically sealed as an option.
  • Microminiature DVRTs are available with super-elastic, nickel titanium cores.
  • DVRTs have a standard operating temperature range up to 175 degrees C; LVDTs typically only operate up to 85 degrees C.
  • DVRTs have been operated successfully in liquid nitrogen; LVDTs typically only operate to -20 degrees C.
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#1060: What's the output from the DVRT?

The output is an analog DC voltage proportional to linear displacement.  The full scale voltage is optionally +/-5 volts or 0-10 volts.  The analog voltage is easily read using a multi-meter or DAQ.  The voltage can also be read in the digital domain by using LORD MicroStrain® Smart Motherboards.  These Smart Motherboards provide a data gateway to PC-based software or to user-programmable LCD displays on the motherboard itself.

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#1059: Are DVRTs submersible?

Yes. DVRTs can be used in wet environments.  One of our customers uses the DVRT to measure mussel growth on the ocean floor.  An automotive customer uses the DVRT in a hot oil environment for under-the-hood testing.  Our orthopaedic customers use the DVRT for soft and hard tissue testing (in vivo and ex vivo) in cadaver and animal studies.

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#1058: Is there a mating connector for the DEMOD-DC?

Yes.  A Micro-D connector with color-coded wire pigtail is provided and is designed to complete the run to a DAQ.

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#1057: What is the spring force of the microminiature gauging and the subminiature gauging DVRTs?

The spring force on standard units is 0.2 newtons/mm or 1 pound/inch.

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#1056: Is there a comparison chart for the DVRT line?

Yes.  A comparison chart may be found at: http://files.microstrain.com/Displacement-Sensors-Comparison.pdf

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#1055: How much pressure can DVRTs withstand and still be functional?

Sandard DVRTs can operate up to 100 PSI.  However, custom-designed sensors have been used in applications up to 10,000 PSI.  Please contact your sales or support engineer for more info.

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#1054: Are DVRTs calibrated?

Typically, every DVRT is calibrated at the factory with its accompanying DEMOD signal conditioner.  The calibration is made over the entire system (DVRT and DEMOD) to insure the highest accuracy.  DVRTs and DEMODS are color-coded to insure that they stay together as a pair when in use.

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#1053: Where would I find scientific papers describing the use of DVRTs?

LORD MicroStrain® posts links to a number of published scientific papers at: http://www.microstrain.com/company/scientific-papers

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#1052: Which of the DEMOD signal conditioners provide temperature compensated conditioning?

DEMOD Type Temperature Compensation
DEMOD-DVRT No
DEMOD-DVRT-TC Yes
DEMOD-DC No

 

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#1051: Do DVRTs always require a Motherboard or Smart Motherboard to operate?

No.  LORD MicroStrain® makes a DEMOD-DC which provides an alternate method of DVRT signal conditioning.  The DEMOD-DC provides conditioning as an in-line connector and connects to your DAQ.  Although not normally recommended, a DEMOD-DVRT or a DEMOD-DVRT-TC can be used without its Motherboard enclosure; external power is the only requirement.

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#1049: What is a ‘Motherboard’ and what is the difference between a standard Motherboard and a Smart Motherboard?

The term ‘Motherboard’ refers to the LORD MicroStrain® DEMOD-DVRT or DEMOD-DVRT-TC signal conditioner mounting chassis.  The standard Motherboard provides a mounting slot and power to the individual DEMODs.  The Smart Motherboard provides a mounting slot, power and digital communications (RS-232) to the individual DEMODs.  Both Motherboard and Smart Motherboard provide analog ouput to a DAQ.  In addition, Smart Motherboard provides digital output to a computer.  Motherboards and Smart motherboards can accommodate 1 to 8 DEMOD cards.

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#1048: What attachment options are available for DVRTs?

DVRT Type Threaded Core Threaded Body Core Clamps Body Clamps SM-Block Core/Body Magnetic Mount Core/Body
Subminiature X X     X X
Subminiature Gauging X X        
Microminiature X X X X    
Microminiature Gauging X X   X    
Non-Contact   X**        

** Non-Contact comes standard with threaded body except for 5.0.

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#1047: Can an LVDT use the DEMOD signal conditioning electronics?

In a word, no. The design of an LVDT’s coil forms a Wheatstone full bridge and the design of LORD's DVRT coil forms a Wheatstone half-bridge. LORD MicroStrain® signal conditioning electronics are designed for the half-bridge.  Likewise, a DVRT can not use a LVDT's signal conditioning electronics.

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#1046: What is the difference between a DVRT and an LVDT?

DVRT (Differential Variable Reluctance Transducer) and LVDT (Linear Variable Differential Transformer) combined with their signal conditioners convert a linear displacement into a linear variable electrical output signal. The displacement is detected by the movement of a core within the coils inside of the sensor. The difference between the sensors is in their coil format.

DVRT: The coil shown below is energized using an AC excitation through the center tap. The coil is usually arranged in a Wheatstone bridge with the Center Tap being the bridge excitation (forming a "half bridge"). With the core in the central location (null) the signals Va and Vb are equal. When the core moves, Va and Vb vary proportionally. Since this design is less complicated we are able to produce considerably smaller sensors than LVDT manufacturers.

LVDT: The primary coil is excited with an AC waveform. When the core is in the central location, the coupling between the secondary coils (Va & Vb) and the primary coil Ve) is equal. When the core moves, Va changes proportionally to Vb in both magnitude and phase.

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#688: What is the Euler angle measurement range of the 3DM?

The 3DM is a 3-axis orientation sensor capable of measuring:

  • -180˚ to + 180˚ of yaw (heading)
  • -180˚ to +180˚ of roll
  • -90˚ to +90˚ of pitch (see note following)

Note: The 3DM has a pitch range of +/-90˚.  It will measure pitch accurately within this range.  However, due to a mathematical singularity in the Euler theorem, as pitch exceeds either -70˚ or +70˚, the yaw and roll measurements of the 3DM will become numerically unstable.  So to put it another way, if you are just measuring pitch with the device, all measurement between -90˚ and +90˚ will be accurate.  If you are measuring pitch and roll at the same time (for example), pitch measurements beyond -70˚ or + 70˚ will effect the accuracy of the roll.

 

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#677: What formulas are used to convert between the various orientation data quantities?

Here is a link to a detailed technical note: http://files.microstrain.com/Orientation%20Conversion%20formulas.pdf

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#672: Does the Inertia-Link® or 3DM-GX2® have an analog out option?

No, not currently. If you need an analog out option, please consider our 3DM-GX1® at:

http://www.microstrain.com/3dm-gx1.aspx

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#664: Is it possible to use the RS-232 interface of LORD MicroStrain® inertial sensors with a serial port emulator (i.e., with a USB to serial adapter)?

Yes.  We have had good success with several types of off-the-shelf USB to serial port adaptors, such as those from IOGear and Keyspan, which may be purchased through any of the electronics products distributors.

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#658: May I write my own software application for the Inertia-Link® and 3DM-GX2®?

Yes. We provide a complete data communications protocol manual which describes in detail each and every command and response that is available with the devices.  Applications may be developed in any programming environment (C, VB, LabVIEW, Matlab, etc.) which supports communication via serial port.

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#599: Where can I find mounting and connector information for the 3DM-GX3 OEM version?

Here is a link to a detailed technical note: http://files.microstrain.com/3DM-GX3-25_OEM_Footprint_and_Connector.pdf

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#598: Can the USB and serial interfaces of the 3DM-GX3 be used at the same time?

No – only one can be used at a time.  The device auto-senses which communication signal is attached (USB or serial), and only uses that channel for communications.

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#597: Where can I buy additional communication 3DM-GX3 and 3DM-GX3 OEM interface connectors?

The standard unit uses a specialized Ulti-Mate brand micro-DB9.  This technical note contains more details: http://files.microstrain.com/TN-I0023_Inertia-Link_3DM-GX2_3DM-GX3_Pin-Outs.pdf

The OEM unit uses a Samtec FTSH-105-01-F-D-K.  This technical note contains more details: http://files.microstrain.com/3DM-GX3-25_OEM_Footprint_and_Connector.pdf

LORD MicroStrain® suggests that you purchase additional connectors with your order.

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#596: How long can the communication cables be for the 3DM-GX3?

The 3DM-GX3 USB and RS-232 communication interfaces are built to satisfy the standard USB-IF and EIA specifications.  LORD MicroStrain® provides 6 foot cables as standard.  Many techniques can be used to extend the length of the communication interfaces including powered USB hubs, USB boosters, RS-232 extenders, etc.

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#595: What is the purpose of the double mounting holes on the 3DM-GX3 standard enclosure?

The 3DM-GX3 standard enclosure has been designed with precision alignment holes on the ‘ears’ of the enclosure to allow the user to install the unit with precise alignment to the rest of the components in the user’s application.

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#594: Does the 3DM-GX3 require calibration during use?

The 3DM-GX3 is calibrated at the factory.  The user is also provided with Hard and Soft Iron Calibration software to field calibrate the GX3 in situ.  This video further describes the function: http://www.microstrain.com/video/hard-soft-iron-calibration

Important note: Hard and soft iron calibration is not required for the 3DM-GX3-15 and the 3DM-GX315 OEM.  These units do not contain magnetometers.

From time to time the 3DM-GX3 may need recalibration. For example, as a result of coming in contact with magnetic influences (magnets, motors, etc.), residual magnetism may be picked up by the on-board components which will alter the calibration.  Another example: the 3DM-GX3 receives a severe shock, slightly altering the position of the circuit boards in relation to the enclosure, again altering the calibration.  In these cases the unit should be returned to the factory for recalibration.

 

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#593: Does the 3DM-GX3 have an analog out option?

No.

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#592: Can I use multiple 3DM-GX3 at the same time?

Yes. Any number of units can be operated by a host at the same time. Several considerations surround this implementation (primarily computing power) and we suggest that you discuss your requirements with LORD MicroStrain® sales or a support engineer.

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#591: What are the power requirements of the 3DM-GX3?

For the standard units, here is a link to a detailed technical note: http://files.microstrain.com/TN-I0023_Inertia-Link_3DM-GX2_3DM-GX3_Pin-Outs.pdf

For the OEM units, here is a link to a detailed technical note: http://files.microstrain.com/3DM-GX3-25_OEM_Footprint_and_Connector.pdf

 

 

 

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#590: Can the 3DM-GX3 be installed in any orientation?

Yes, there are no limitations.  However, if a user requires a ‘zeroing’ of the axes, this must be done in the user’s external application.  Good practice dictates that the orientation matrix be used to calculate such zeroing.  Please also be aware of the mathematical singularity in Euler angles.

The user should be aware that the Euler angle formulation in general contains a mathematical singularity at Pitch = +90 or –90 degrees. In practice, poor numerical results will be present if the Pitch angle exceeds +/-70 degrees. In applications where the Pitch angle cannot be guaranteed to exceed these values, it is recommended that the orientation matrix output be utilized instead.

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#588: Are the 3DM-GX3 sampling rates adjustable?

Yes. The sampling rates are user adjustable.

For the -15 and -25, the user may set the sampling rate at up to 1000 Hz depending on the data quantity.

For the -35, the user may set the AHRS sampling rate up to 1000 Hz depending on the data quantity and the GPS sampling rate up to 4 Hz.

For the -45, the user may set the Navigation sampling rate up to 100 Hz.

 

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#587: At what baud rates can the 3DM-GX3 be operated?

The baud rate is user adjustable and may be set to 9600, 19200, 115200 (default), 230400, 460800, and 921600.

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#585: Can distortions of Earth’s magnetic field degrade the system accuracy of the 3DM-GX3?

Yes.  The presence of strong magnetic fields or large magnetic materials will distort Earth’s weak local magnetic field and this will influence the on-board magnetometers.  A hard and soft iron calibration software utility is provided to field calibrate the 3DM-GX3-25, 3DM-GX3-25 OEM, 3DM-GX3-35 and 3DM-GX3-45.

The 3DM-GX3-15 and 3DM-GX3-15 OEM do not contain magnetometers and are not affected by hard and/or soft iron interference.

 

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#584: What orientation output formats are available with the 3DM-GX3?

The following orientation outputs formats are available:

  • Acceleration
  • Angular Rate
  • Magnetic Vector
  • DeltaAngle and DeltaVelocity
  • Orientation Matrix
  • Quaternion
  • Euler Angles (pitch, roll and yaw)
  • ...and more.

A detailed description of these outputs can be found in the Data Communications Protocol manual of each product.

 

 

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#583: What communication interfaces are available for the 3DM-GX3?

The standard units support both USB and RS-232 interface.

The OEM units support both USB and TTL.

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#581: May I write my own software application for the 3DM-GX3?

Yes. We provide a complete data communications protocol manual which describes in detail each and every command and response that is available with the device.  Applications may be developed in any programming environment (C, VB, LabVIEW, Linux, Matlab, etc.) which supports serial communication.

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#580: What software do you provide for 3DM-GX3?

We provide a general application for Microsoft XP/Vista/Win 7 operating systems that configures, reads, displays and saves data generated by the device.  This application (MIP Monitor) supports both the USB and RS-232 communication interfaces.

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#579: How is the 3DM-GX3 packaged?

When you initially purchase a 3DM-GX3, a starter kit (SK) provides you with everything you need to get started! SKs include a 3DM-GX3 module, communication and power cables, software, manuals and GPS antenna if applicable.  In subsequent purchases you may only require additional modules or other individual components. Several communication interfaces are available creating several starter kit variations.

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#578: What is the 3DM-GX3-25 and 3DM-GX3-25 OEM accuracy?

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

 

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#577: Can the user retrieve the current GPS almanac from the 3DM-GX3-45 via USB or RS-232?

Yes, but the method is a bit involved.  The user would have to put the -45 in direct mode to the GPS, use the u-blox commands to retrieve the almanac, and put the -45 back into normal mode for regular use.

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#576: Can you characterize the 3DM-GX3-45 horizontal position accuracy?

The GPS datasheet accuracy is CEP at 24 hours stationary, a common test condition for GPS.  CEP is a 50% confidence number.  Like other single (non-differential) GPS units, our accuracy is limited by constellation geometry, atmospheric, and clock error effects (largest contributors when selective availability is not included.)  This pegs best performance at approximately 5 meters RMS dynamic.  This is improved for areas where WAAS is enabled.

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#575: Can you quantify the 3DM-GX3-45 positional vertical accuracy?

We have not performed extended duration tests against a surveyed point, but have tested against a higher-performing unit (with tightly-coupled filter.)  Dynamic RMS position error during car and flight tests for the vertical channel, hover around 5m, with individual excursions out to about 10m.  Telling which unit was more accurate at a given time, and at which extreme of the uncertainty ellipse each is at, is more difficult.

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#574: Does the 3DM-GX3-45 use an active/powered antenna?

Yes, the antenna is powered at 3 Volts and draws 10 mA.

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#573: What is the GPS module being used onboard the 3DM-GX3-45?

u-blox 5 AMY module.

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#572: For U.S. entities, is it possible to get a 3DM-GX3-45 without the COCOM GPS limits?

No, our GPS supplier does not produce modules without this limitation.

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#571: What is the maximum acceleration and jerk (first derivative of acceleration) that the 3DM-GX3-45 GPS will maintain lock?

4g maximum acceleration (must use Airborne dynamics mode).  We have no published numbers on jerk from the GPS module manufacturer.

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#570: Does the 3DM-GX3-45 filter estimate the attitude first and then position (cascaded filters) or is it one large filter?

The attitude, position, velocity, and sensor bias states are all states within the same filter; therefore, they are calculated together.

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#569: Does the 3DM-GX3-45 use the output of the GPS filter (latitude, longitude, altitude) when doing the overall position and attitude estimates?

The attitude, position, velocity, and sensor bias states are all states within the same filter; therefore, they are calculated together.

 

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#568: Does the 3DM-GX3-45 use a tightly coupled GPS/INS Kalman filter using GPS pseudo-ranges?

The 3DM-GX3-45 implements a loosely-coupled filter that uses the GPS solution (position and velocity) as an input to the filter.

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#567: Is the 3DM-GX3-45 GPS PPS (pulse per second) signal available to outside devices?

The GPS PPS signal is available on pin 7. It can drive one high impedance TTL input.

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#565: Can my 3DM-GX3-35 be upgraded to a 3DM-GX3-45?

No.  A 3DM-GX3-35 can not be upgraded to a 3DM-GX3-45.

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#563: Is there an option to turn off the 3DM-GX3-45 GPS and run just the AHRS?

Yes, this can be done easily in software.

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#562: Is there a Kalman Filter implemented in the 3DM-GX3-45?

Yes.  The Theory of Operation document will be of interest.  It is available at: http://files.microstrain.com/3DM-GX3-45_Theory_of_Operation.pdf

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#551: Is the data output of the 3DM-GX3-45 time-stamped?

Yes, several time-stamps are available depending on the output including AHRS time-stamp, GPS synch time-stamp and GPS correlation time-stamp. The GPS time-stamp is available across all 3 datasets including NAV, GPS and IMU.

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#541: What type of connector is used on the 3DM-GX3-35 and 3DM-GX3-45 GPS antenna?

The connector is an MMCX type connector.  The non-magnetic extension cable with SMA connector provided by LORD MicroStrain® must be used to isolate the magnetometers from magnetic connectors.

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#539: Since the 3DM-GX3-35 has on-board GPS, does it support any type of mapping software?

The 3DM-GX3-35® has a GPS direct mode to use the device in GPS only mode. This is compatible with existing NMEA and UBX applications.

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#538: Can my 3DM-GX3-15 or 3DM-GX3-25 be upgraded to a 3DM-GX3-35 or 3DM-GX3-45?

No.  There is no upgrade path.

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#536: Is there an option to turn off the 3DM-GX3-35 GPS and run just the AHRS?

Yes, it is easily done in software.

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#535: Is there a Kalman Filter implemented in the 3DM-GX3-35?

No. We do however have a Kalman filter on our 3DM-GX3-45 product.

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#521: Is the data output of the 3DM-GX3 -35 time-stamped?

Yes, several time stamps are available including AHRS time stamp, GPS synch time stamp and GPS correlation time stamp.

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#505: How do you use the 50g, 100g and 200g triaxial accelerometer cubes with the V-Link-LXRS?

Here is a link to a detailed technical note: http://files.microstrain.com/tech_notes/TechNote_2400_TriaxialAccels.pdf

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#504: What is the purpose of the internal power switch on the V-Link-LXRS, SG-Link-LXRS, G-Link-LXRS, DVRT-Link-LXRS, TC-Link-1CH-LXRS and TC-Link-6CH-LXRS?

The internal power switch allows the wireless node to use external power from batteries or other sources. Here is a link to a detailed technical note: http://files.microstrain.com/8401-0004-Using-External-Power-With-Wireless-Sensor-Nodes.pdf

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#503: What bridge configuration is supported by V-Link-LXRS, SG-Link-LXRS, SG-Link-OEM-LS and SG-Link-OEM-LXRS?

The V-Link-LXRS has 4 strain gauge channels; the SG-Link-LXRS, SG-Link-OEM-LS and SG-Link-OEM-LXRS have 1 strain gauge channel. When ordering these units, you must specify the bridge completion for each channel.  Full, half and quarter are all available and they can be mixed and matched.  These completions are accomplished in the factory as part of the final assembly.

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#502: Is the G-Link-LXRS calibrated?

The G-Link-LXRS contains 3 accelerometers, one on each of the 3 axes.  A simple linear calibration (over a range of +/- 1g) is done at the factory and this slope (gain and offset) calibration is stored in the non-volatile memory (EEPROM) of the G-Link-LXRS.  The user can elect to use this calibration in conjunction with Node Commander software to measure acceleration, or the user can make their own calibration of the instrument.

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#501: What is the format of the data generated by the wireless system?

All software provided by MicroStrain saves data files in CSV (comma separated value) format.  The CSV file is readily importable into any third party analysis program.

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#500: What are the shock limits of wireless nodes?

The wireless nodes, including circuit boards, antenna, internal battery and enclosure, can withstand shock loads up to 500g. LORD MicroStrain® can provide customization of the nodes by using high-G crystals, potting and non-masted antennas to withstand greater shock loads.

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#499: How much datalogging memory do wireless nodes have?

The wireless nodes all have 2 Mbytes of datalogging memory.  This 2 Mbytes is organized into 8,191 ‘pages’ of memory, each page holds 132 data points.  The maximum number of data points that can be held in memory can be calculated as follows: 8,191 pages x 132 data points/page = 1,081,212 total data points.

Now the question arises, ‘how long can a node datalog before its memory is full?’. The answer is that it varies depending on how many channels are being sampled and what sampling rate has been set. Here are two examples:

Let’s set a V-Link-LXRS so that channel 1 is active with a datalogging sampling rate of 2048 samples per second and we launch continuous datalogging.  Our calculation would be:

  • 1 channel x 2,048 samples per second = 2,048 data points per second
  • 1,081,212 data points / 2,048 data points per second = 527 seconds
  • 527 seconds / 60 seconds per minute = ~9 minutes to fill the memory

Let’s set a G-Link-LXRS so that channels 1, 2 and 3 are active with a datalogging sampling rate of 32 samples per second and we launch continuous datalogging.  Our calculation would be:

  • 3 channels x 32 samples per second = 96 data points per second
  • 1,081,212 data points / 96 data points per second = 11,262 seconds
  • 11,262 seconds / 60 seconds per minute = ~187 minutes to fill the memory
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#498: How are V-Link-LXRS, SG-Link-LXRS, G-Link-LXRS, DVRT-Link-LXRS, TC-Link-6CH-LXRS and TC-Link-1CH-LXRS powered?

The nodes contain an internal high capacity rechargeable battery.  The nodes are provided with an external power supply which is used to recharge these batteries.  The battery life of the internal battery is fully dependent on the data acquisition mode.  High speed streaming will consume the battery in hours while low duty cycling can operate months and months if a low sample rate is set.  The nodes may also be powered externally by an external battery or power supply.

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#497: How are strain gauges calibrated with the wireless nodes?

V-Link-LXRS, SG-Link-LXRS, SG-Link-OEM-LS and SG-Link-OEM-LXRS support strain gauges.  Node Commander software contains a strain gauge ‘wizard’ which allows the user to calibrate the output of the strain gauges using an on-board precision shunt resistor.  With this calibration, the nodes can now output engineering units, i.e. microstrain.

 

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#496: What radios are used in LORD MicroStrain® Wireless Sensor Networks?

The gateways (base stations and WSDA-1000) and the wireless nodes employ radios with these general specifications (see the individual product data sheet for any variations):

Radio frequency (RF) transceiver carrier 2.4 GHz direct sequence spread spectrum, license free worldwide (2.405 to 2.480 GHz) – 16 channels, radiated power programmable from 0 dBm (1 mW) to 16 dBm (39 mW); European models limited to 10 dBm (10 mW)
RF data packet standard IEEE 802.15.4, open communication architecture
RF data downloading 8 minutes to download full memory
Range for bi-directional RF link programmable communication range from 70 meters to 2 kilometers

 

 

 

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#494: Where would I find white papers describing the use of Wireless Sensor Networks?

White papers are posted at: http://www.microstrain.com/white-papers.aspx

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#493: What is the difference between finite sampling and continuous sampling?

In FINITE sampling, the user sets a total number of samples to be taken which equates to a time period.  Because the sampling rate per second is known, the user can adjust the number of samples to be taken to determine how long the sampling period will be.

In CONTINUOUS sampling, the user does not set the total number of samples and therefore does not set the time of the sampling period.  By selecting CONTINUOUS sampling, the user is instructing the system to sample data until the user manually stops the sampling (via software), the power is cycled, the on-board datalogging memory is full, the battery dies, the power fails, etc.

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#492: What data acquisition modes are available on Wireless Sensor Networks?

LORD MicroStrain® Wireless Sensor Networks provide several data acquisition modes including:

  • Synchronized Sampling
  • Armed Datalogging
  • Streaming
  • Duty Cycle

See the particular wireless node for specifics.

 

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