Microstrain Little Sensors. Big Ideas.

inertial banner

3DM-DH® -- Discontinued -- Limited Availability

3DM-DH Down Hole Orientation Sensor

Microminiature Solid State 3-axis Pitch, Roll, and Yaw Sensor

The 3DM-DH® OEM Orientation Sensor is designed to provide 3-axis static and quasi-dynamic orientation measurements. It incorporates 3 accelerometers and 3 magnetometers together with an on-board microprocessor, embedded software algorithm, non-volatile memory for configuration, and serial communication interface. Its form-factor, rated temperature range and power supply requirements are optimized for a broad array of applications and is specifically targeted at OEM and downhole users. The 3DM-DH® outputs acceleration vectors, magnetic field vectors, Euler angles (pitch, roll, yaw) and orientation matrix and has optional analog output.

3DM-DH Down Hole Orientation Sensor

Easiest to Use

  •     out-of-the-box pitch, roll, and yaw

Best in Class

  •     high-speed sample rate & flexible data outputs
  •     extended use, low-power data logging

Cost Effective

  •     reduced cost and rapid time to market for customer’s applications
  •     aggressive volume discount schedule


static/quasi-dynamic measurements

Sensor suite

accelerometers, magnetometers

Orientation range

360° about all axes

Accelerometer range


Accelerometer bias stability


Accelerometer nonlinearity


Magnetometer range

+/-6 Gauss

Magnetometer bias stability

0.4 Gauss

Magnetometer nonlinearity


A/D resolution

12 bits

Orientation accuracy

pitch +/-0.7° typical, roll +/-0.7° typical, yaw +/-1.5° typical

Orientation resolution

<0.1° at most aggressive setting


pitch and roll 0.7° typical, yaw 0.26° typical

Output modes

acceleration, magnetic fields, Euler angles (pitch, roll, yaw), orientation matrix

Analog output

factory option; provides voltage linearly proportional to inclination; 0-5 volts full scale

Communication interface


Communication/power connector

RJ11 type

Data rate

angle mode up to 45 Hz; sensor mode up to 70 Hz


infinite impulse response (IIR); user programmable weighted moving average

Baud rate

1200, 9600, 19200

Power supply voltage

+5.2 to +12.0 VDC

Power consumption

50 mA

Operating temperature

-25°C to +70°C


28mm x 71mm x 18mm


11 grams

Shock limit




#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.

Direct link: view

#1341: What are the terms and conditions under which LORD MicroStrain® products are sold?

LORD MicroStrain® complete terms and conditions of sale may be found at: http://files.microstrain.com/terms-conditions-sale.pdf

Direct link: view

#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

Direct link: view

#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

Direct link: view

#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.

Direct link: view

#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

Direct link: view

#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


Direct link: view
Related products:

#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.

Direct link: view

#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.

Direct link: view
Related products:

#1327: Is the 3DM-DH calibrated?

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

Direct link: view
Related products:

#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
Direct link: view
Related products:

#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.


Direct link: view
Related products:

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

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


Direct link: view
Related products:

#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)


Direct link: view
Related products:

#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.


Direct link: view
Related products:

#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

Direct link: view

#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.

Direct link: view


How To Order

To discuss configuration for your specific system requirements, please use our contact sales page.

For large quantity orders or OEM discussions, please contact Michael_Robinson@LORD.COM.

If you are outside the US, please contact one of our distributors.


  • Downhole Orientation
  • Vertical Wells
  • Antenna, Satellite, and Camera Pointing
  • Robotic Control

Related Products

  • 3DM-DH33DM-DH3™ - Downhole Orientation Sensor and Data Logger