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Eight Channel Signal Conditioner Board


  • Eight channels of AC LVDT conditioning
  • Full-bridge and Half-bridge LVDTs supported
  • Offset and wide-range gain calibration pots
  • Removable screw terminal blocks for easy connection and serviceability
  • Use easily with PLC or PC-based Data Acquisition
  • Non-multiplexed, simultaneous conditioned outputs
  • Compatible with other ACCES A/D products for use in legacy systems using DB37M connector
  • Jumper selected LED display utility for quick and easy operating verification of connected LVDTs
  • Factory oscillator frequency of 10kHz
  • Master / Slave excitation frequency synchronization
  • Onboard DC/DC converter with reverse power protection operates on a single 12VDC external source
  • Designed, made, supported, and manufactured in the USA


  • Powered from 12VDC, 48VDC or 15VDC
  • RT-BOX industrial enclosure
  • DIN rail mounting provision
  • Excitation frequencies from 20Hz to 20kHz
  • Non-synchronized oscillators
  • Wide gain ranges available per channel
  • Multiplexor accessory (LVDT-MUX) allows up to eight LVDT-8U boards to be connected to one A/D board

The LVDT-8U signal conditioning board was designed to improve upon the advances made with the release of our LVDT-8A model. Half-bridge LVDTs requiring high-gain and a wide offset adjustment are now supported, as well as the inclusion of one master channel for frequency generation, which all other channels are synchronized to. This eliminates beat frequencies when sampling the outputs with a fast A/D, providing more reliable and accurate data.

The board supplies excitation and the corresponding conditioning of the outputs for up to eight independent LVDT transducers simultaneously. Those outputs are then readily available via removable screw terminals for introduction to a data acquisition or measurement circuit such as an analog to digital converter or simply by using a display meter.

It also has an LED display utility for quick and easy checkout of the sensors and signal conditioner operation. Jumper select the channel of interest and observe the output voltage level as +10V, +5V, ZERO, -5V or -10V. This inherently makes the product more serviceable and vastly more user friendly.


Certain LVDT sensor specifications affect the way the LVDT-8U board will be configured for your application, so please have this information available when placing your order.

  • Model Number of LVDT (a second set of eyes always helps to verify the specifications)
  • Configuration / Number of wires (full-bridge / 4 wires or half-bridge / 3 wires)
  • Displacement / Travel (usually specified in mm or mils if not in metric)
  • Displacement / Travel of interest (this is often less distance than the LVDT is capable of)
  • Output Span / Sensitivity (usually specified in mV/V/mils)
  • Excitation Voltage (such as 2.5Vrms nominal)
  • Excitation Frequency (such as 4.8kHz +/-8%)
  • Desired Output Signal Level (such as +/-1V to +/-14V)
  • Desired Bandwidth (the rate at what the LVDT probe tip will be moving)


Accessories include an assortment of 37-pin ribbon cables for connecting the conditioned outputs to a variety of readily available analog to digital converter products. ACCES offers a broad range of A/D products using USB, RS-485, PCI, PC/104, Ethernet, 900MHz/2.4GHz wireless, and even ISA bus types. For high-channel count applications our multiplexor accessory allows up to eight LVDT-8U boards to be connected to one 8-channel A/D board.

No software is necessary to start using the LVDT-8U. A user friendly setup program and user manual is included with each shipment. The setup program can be used to help with the selection of application specific options and the user manual contains full details on the boards operation.

Available Reference Manuals

Available Software Downloads

Available Datasheets

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 more
Signal Conditioner
Excitation Frequency:
10kHz standard
The frequencies may be anywhere in the range of 20Hz to 20kHz however this is a factory installed option which should be specified at the time of purchase. Frequencies may also be different for each LVDT channel.
Power Required:
+24 (18 to 36) VDC at 350 mA maximum
Options Include:
  • +12 (9 to 18) VDC at 700 mA maximum
  • +48 (36 to 75) VDC at 175 mA maximum
  • External power supply: ±12VDC or ±15VDC at ±300 mA maximum
Output Analog Voltage:
±5VDC to ±10VDC
Operating Temperature:
0°C to 65°C
Storage Temperature:
-40°C to +100°C
0 to 90%, non-condensing
Size (LVDT-8U board):
8.0" long (203 mm) X 4.75" wide (120 mm) X 0.75" high (19 mm)
Size (RT-BOX):
8.5" long (216 mm) X 5.25" wide (133 mm) X 2.375" high (60 mm)

ModelPrice (USD)

LVDT-8U - Signal conditioning card installed in enclosure
LVDT-MUX - Multiplexor Accessory board

Acquisition, Control, Communication: Engineering and Systems