LVDT Interface Model LVDT-8


  • This product has been discontinued. Please contact us for help in finding a suitable replacement.
  • Great News! ACCES has designed the replacement for this discontinued product. Just a click away to the LVDT-8A!
  • Excitation and signal conditioning for up to eight independent LVDT transducers
  • DC outputs multiplexed to a host-mounted A/D converter
  • 5 KHz excitation frequency (1-10 KHz optional)
  • Individual offset, gain and phase adjustments
  • Up to 64 LVDT's per A/D converter
The LVDT-8 is mounted externally to the host computer in a metal enclosure that measures 8" x 4.75" x 0.75". Each LVDT-8 provides AC excitation and signal conditioning to eight independent LVDT transducers connected to the card via terminal blocks. A regulated voltage oscillator supplies standard 5 KHz excitation (1-10 KHz available) to the primary windings of the LVDT's. Signals from each LVDT secondary pass through an RC phase adjustment circuit and are then applied to a synchronous demodulator and low pass active filter for conversion to DC voltage. The DC signal then passes through an amplifier which provides offset and gain adjustment. Gain-selection jumpers are provided on each channel. All DC outputs are connected to an 8:1 multiplexer. The multiplexer is controlled by a 3-bit address (A0, Al, A2) from the A/D converter in the host computer. The output of the multiplexer is buffered and connected via jumpers OV-0 through OV-7 to one of eight output channels. Outputs can then be coupled to multiplexed A/D cards such as ACCES' Model AD12-8. Since one LVDT-8 module requires only one output channel to serve eight transducers, a total of 64 transducers can be served per eight-input A/D card. If more channels are needed, then additional A/D card(s) can be installed in the computer.

Available Reference Manuals

Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.


  • Transducers Served: LVDT, RVDT, LVRT with primary impedances of 150 Ohms or greater.
  • Excitation: 3.2 Vrms at 5 KHz, all channels synchronized. Optionally, the frequency may be anywhere in the range of 1 to 10 KHz. Also, frequency selection can be made individually for each LVDT channel. Actual frequency may be slightly different.
  • Available Gains: Each channel has a gain from 1 to 8, selected by jumpers and adjustment potentiometers. A post amplifier provides a gain of either 2 or 3 applied to all channels on a card.
  • Output Analog Voltage: + 5 VDC.
  • Control Inputs: Three binary digital inputs for channel selection. Logic levels compatible with LSTTL logic.


  • Operating Temp: 0 to 65oC.
  • Storage Temp: -40 to 100oC.
  • Humidity: 0 to 90% RH, non-condensing.
  • Size: 8.0 by 4.74 by 0.75 inches, fits inside the included T-Box enclosure
  • Power Required: +12 VDC: 230 mA; -12 VDC: 230 mA
Regulatory Compliance
Declaration of Conformity, and Test Reports are on file. Users must use appropriate shielded cables.

ModelPrice (USD)

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