The DEMOD-DC® in-line signal conditioner makes DVRT® sensors as easy to use as a potentiometer. With integral signal conditioning electronics, the user connects power, ground and analog out, and the DEMOD-DC® outputs a buffered, high-frequency response voltage proportional to linear position. During the manufacturing process the analog output voltage is digitally trimmed, ensuring that every DVRT®’s offset and gain values match one another. The DEMOD-DC® provides internal power regulation and reverse polarity protection, and will operate with a wide range of input voltages.

Datasheet
Large Quantity & OEM Orders

Ease of Implementation

  • Out-of-the-box use with all standard LORD MicroStrain® DVRT® sensors
  • Miniature body for embedded and space restricted applications
  • Identical performance between units for quick scaling

High Performance

  • High dynamic range for difficult measurements
  • Ready for use with LORD MicroStrain® wireless sensor network
Sensor Types inductive (DVRT®)
Excitation regulated sinewave, 150 kHz standard other frequencies available on request
Demodulation asynchronous, DC output
Output 0 to 5 V typical, digitally trimmed
Gain factory adjustable from 10 to 10,000
Low pass filter 2 Pole, 3 dB down @ 800 Hz standard factory adjustable 10 Hz – 20 kHz
Supply voltage + 6.0 to + 16 volts DC
Supply current 22 mA typical (15 mA when modified for use with LORD MicroStrain® V-Link® or DVRT-Link™ wireless nodes)
Warm-up time 30 seconds recommended
Operating temperature -40 to +85 °C
Enclosure size 65.7 mm x 19.9 mm x 8.3 mm
Connections power, ground, analog output
Connector micro-D (MIL-C-83513/5) mating connector included
Weight 12.02 g

 

Mechanical

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.

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

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

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

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

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

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.

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

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.

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.

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

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.

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.

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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