The DEMOD-DVRT2 is a high-performance, high-resolution, expandable DVRT signal conditioner designed for use with all MicroStrain LVDT's.
Product Highlights
- Accurate, repeatable signal processing for all contact-types
- Modular form-factor for a stand-alone single sensor, or use in a four-channel backplane with optional DIN-rail mount
- Filtered and buffered output provides clean, high-level signals to coaxial connections
THIS PRODUCT HAS BEEN DISCONTINUED AND IS NO LONGER AVAILABLE FOR PURCHASE.
Datasheet ManualDesigned for ease of use and general versatility, this printed circuit card provides complete temperature compensated conditioning for any sensors. The DEMOD-DVRT® -TC utilizes both alternating current and direct current excitation of the sensor’s inductive bridge to accurately measure position in the face of temperature gradients. Each card contains the requisite components to facilitate plug-and-play use, including active, jumper selectable low pass filters, input supply line filters with reverse input protection, and output line buffers. The DEMOD-DVRT® -TC sine wave excitation and synchronous demodulator provide excellent noise rejection and elimination of thermally induced potentials.
DatasheetThe DEMOD-DC in-line signal conditioner makes LVDT sensors as easy to use as a potentiometer. With integral signal conditioning electronics, simply connect 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 every LVDT’s offset and gain values produce optimal system output accuracy. The DEMOD-DC provides internal power regulation and reverse polarity protection and operates with a wide range of input voltages.
THIS PRODUCT HAS BEEN DISCONTINUED AND IS NO LONGER AVAILABLE FOR PURCHASE.
DatasheetHigh Performance
- Precision synchronous demodulation
- Differential amplifier raises AC voltages and provides optimum demodulator performance
- Paired and calibrated with each DVRT sensor for high accuracy outputs
- Line voltage transient filtering and constant current excitation source to the sensor bridge
Easy to Use
- Factory-adjustable output filtering and calibration-model options to match application needs
- Rapid warm-up time
- Analog backplane available for connection optimization
Cost Effective
- Complete position-sensing solution with no integration to other systems required
- Volume discounts
High Performance
- Temperature compensated signal conditioning
- Precision synchronous demodulation
- Rapid warm-up time
Ease of Use
- Plug-and-play with LORD MicroStrain® motherboards
- Compatible with all LORD MicroStrain® DVRT sensors
- Adjustable trimmers to set resolution range
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
Signal Conditioner
- Sensor Types: Parker LORD inductive LVDT (formerly DVRT®) sensors
- Excitation: Alternating constant current, 156kHz typical
- Demodulation: Synchronous, DC output
- Gain: Adjustable from 14 to 10,000 (factory set during calibration)
- Analog Low-Pass Filter: 2-pole, active Butterworth, -3dB @ 800Hz (standard), factory adjustable 10Hz to 20kHz
Operation
- Analog Output Voltage: 0 to 10VDC (standard), 0 to 5VDC (optional)
- Power Source: 12 VDC nominal ± 1 VDC (universal voltage wall AC/DC converter provided)
- Power consumption: 30mA
- Power Indicator: Green power-on indicator
- Warm-Up Time: 5 minutes recommended
Package
- Operating Tempurature: -20 to +60°C
- Enclosure Size: 70mm x 95mm x 20mm
- Connectors:
- Center-positive DC barrel socket (power supply)
- 4 pin receptacle (sensor input)
- HDBNC (analog output); backplane connector
- Analog Backplane: Four channel bus (see backplane specifications)
- Sensor Cable: 4-pin receptacle to 4-pin mini, calibrated with sensor and signal conditioner
- Weight: 113 grams
- Mounting: Desktop with rubber feet (standard), analog backplane (optional)
- Regulatory Compliance: CE, ROHS
Compensates for a temperature gradient across the sensor
Sensor types |
inductive (DVRT®) |
Excitation |
regulated sinewave, 70 KHz typical |
Demodulation |
synchronous, DC output |
Output |
± 4.5 volts typical |
Gain |
factory adjustable 10-10,000 |
Low pass filter |
2 pole, active Butterworth, 3 dB down @ 1 KHz standard; factory adjustable 10 Hz-8 Khz |
Supply voltage |
motherboard supplies power (typical), ± 6.5 volts min, ± 16 volts max (when used without motherboard) |
Supply current |
30 milliamps per rail |
Warm-up time |
15 minutes recommended |
Operating temperature |
-40 to 85˚C |
PC board size |
120mm x 48mm x 20mm (thick) |
Connectors |
10 pin, .1" pitch header (power, ground); LEMO 4 pin receptacle (bridge points); BNC (analog output) |
Trimmers |
offset (std.) |
Signal Conditioner
- Sensor Types: Parker LORD inductive LVDT (formerly DVRT®) sensors
- Excitation: Regulated sinewave, 150 kHz standard (other frequencies available on request)
- Demodulation: Asynchronous, DC output
- Gain: Factory adjustable from 10 to 10,000
- Low-Pass Filter: 2 Pole, 3dB down @ 800Hz standard, factory adjustable 10Hz to 20kHz for higher bandwidth (lower resolution) or higher resolution (lower bandwidth)
Operation
- 0 to 5V typical, digitally trimmed
- Unique calibration curves provided with each unit for optimal accuracy
- Supply Voltage: +6 to +16 VDC
- Supply Current: 22 mA typical (~15 mA when modified for use with V-Link-200 wireless node)
- Warm-Up Time: 30 seconds recommended
Package
- Operating Tempurature: -40 to +85°C
- Enclosure Size: 65.7mm x 19.9mm x 8.3mm
- Connector:
- Interface: micro-D (MIL-C-83513/5) mating connector included for power supply, ground, analog output
- Sensor: 4-pin PEEK LEMO connector
- Weight: 12g
General Documentation
General Documentation
- DEMOD-DVRT-TC Datasheet
- Microminiature and Subminiature DVRT® Quick Start Guide
- Microminiature and Subminiature Gauging DVRT® Quick Start Guide
- Displacement System Chart
- Motherboard Quick Start Guide
Technical Notes
Mechanical Print (Uncontrolled)
General Documentation
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Software/Firmware
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