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4 Channels, 2-28 Vrms Input, 47 Hz-1 kHz

A linear variable differential transformer (LVDT) is a type of electrical transformer/transducer used for measuring linear displacement (position). A counterpart to this device used for measuring rotary displacement is called a rotary variable differential transformer (RVDT). The RVDT is like an LVDT in that it measures a positional displacement, however, the displacement, which is still a linear proportional function, is based on rotary instead of linear positional movement.

Both types provide output signals (voltages) as a proportional linear function based upon an AC reference source. The AC Reference source applied at the transformer primary winding causes a magnetic flux generated on the transformer secondary windings by a moveable core, which causes output signal(s) proportional to the linear displacement position being gauged.

With isolated excitation and signal input covering 2, 3, or 4-wire transducer interfaces and a normalized digital position word based on a percentage of full-scale travel, these modules can interface to virtually any type LVDT or RVDT transformer.

  • Signal, reference and frequency measurements
  • Signal under-voltage and over-voltage detection
  • Reference under-voltage and over-voltage detection
  • Support an optional, programmable AC excitation supply
  • All channels have continuous background Built-In-Test (BIT)
  • Extended LVDT FIFO buffering capabilities for greater incoming data storage/management
  • Programmable FIFO buffer thresholds

  • Resolution: 24-bit
  • Input Format: Linear Variable Differential Transformer (LVDT), Rotary Variable Differential Transformer (RVDT), 2, 3, or 4-wire programmable
  • Input Voltage: 2 - 28 Vrms
  • Reference Voltage: 2 - 115 Vrms
  • Input Impedance: 300 kΩ
  • Accuracy: ±0.025% FS 3-wire or 4-wire and 2-wire w/ compensated phase, ±0.050% FS for 2-wire, uncompensated phase
  • Bandwidth: Default factory setting is 40 Hz. Bandwidth is field programmable on a per channel basis. User must program all parameters for each boot up, or parameter will be set to the default value.
  • Frequency Range: 47 Hz - 1 kHz
  • Phase Shift: Automatically compensates for phase shifts between the transducer excitation and output up to ±60° (3 and 4-wire configurations). Programmable fixed compensation is provided for 2-wire configurations.
  • Self-Test: Built-in wraparound self-test.
  • Power: 5 VDC @ 1 A
  • Ground: Isolated signal and excitation. Channels individually isolated from each other and from system ground.
  • Weight: 2.5 oz. (71 g)
Block Diagram
10/26/2022 8:17:22 AM
10/26/2022 8:16:59 AM
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