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DLx

3 (0.5VA), 2 (1.5/2.2 VA), or 1* (3.0 VA) Channel(s)

Linear Variable Differential Transformer (LVDT) and Rotary Variable Differential Transformer (RVDT) are transformer-type voltage/current transducers that convert a linear/rotary movement of a core/shaft to a multi-wire differential AC electrical signal. Both deliver signals linearly proportional to the position of a shaft (magnetic induction core). An LVDT/RVDT simulator is used to convert digital positional commands to corresponding AC signals.

A wide variety of D/L modules cover the range of excitation voltages/frequency, include extensive field-parameter programmability, and provide a full operating envelope choice for simulating virtually any type of LVDT or RVDT. By eliminating the need for external transformers and operating with lower AC reference frequencies, these solid-state designs offer huge space savings.

There are three types of D/L modules:

Features
  • 3 Channel Modules: These high-density modules have a lower power output drive (0.5 VA per channel, max.). The lower power output drive is ideal for driving solid-state input instruments, gauges (most LVDT/RVDT measurement circuits are high input impedance, as "real" LVDTs/RVDTs do not supply a large amount of current).
  • 2 Channel Modules: The 2-channel modules have a standard power output drive(1.5 VA [2.2 VA for DLE] per channel, max.).
  • 1 Channel Modules*: The single-channel modules have a high-power output drive capability (3 VA per channel, max.). All LVDT/RVDT simulation modules feature a wrap-around self-test capability and most platforms support an optional programmable AC excitation supply. In addition to state-of-the-art technologies and design algorithms, the modules include many other useful application features such as excitation loss detection, and excitation voltage and frequency measurement. They can be programmed (and re-programmed) in the field for any excitation and simulating signal voltage between 2 - 28 Vrms or 28 - 90 Vrms full scale range. Individual excitation inputs are supplied for each A and B output pair. All LVDT/RVDT simulation modules feature a wrap-around self-test capability and most platforms support an optional programmable AC excitation supply. Utilizing state-of-the-art technologies and design algorithms, many useful application features such as excitation voltage and frequency measurement, excitation loss detection and many others are “built-in.” They can be programmed (and re-programmed) in the field for any excitation and simulating signal voltage between 2 and 28 Vrms or 28-90 Vrms full scale range.
  • *Single channel module pending - contact factory for availability.

Specifications
  • Number of Channels: 1, 2, or 3 channels
  • Resolution: 16-bits (.00305% FSR)
  • Linearity: ±0.1% FS for .2 ≤ Turns Ratio (TR) ≤ 2.0 (3 or 2-channel); ±0.35% FS for .2 ≤ Turns Ratio (TR) ≤ 2.0 (single-channel); ±0.1% FS (DLL only*) *Accuracy maintained based on customer-specified set of operating parameters to include VLL, VREF @ FREQ (expected operating parameters tolerance within ±20% for all channels). Board-level dash number to be assigned.
  • Output Format: Configurable for either 3/4-wire or 2-wire. Galvanically isolated. Output voltage is programmable fixed or ratiometric.
  • Output Voltage: 2-28 VLL (low voltage modules); 28-90 VLL (high voltage modules).
  • Output Load*: 0.5 VA (3-channel), 1.5/2.2 VA (2-channel), or 3.0 VA (single-channel). Short circuit protected. *Output Load/Drive Power Derating: For low voltage modules (2-28 VLL), the specified power is rated maximum at 28-11.8 VLL, then derates linearly from 11.8 VLL to 2 VLL; For high voltage modules (28-90 VLL) the specified power is rated maximum at 90 VLL, then derates linearly to 28 VLL.
  • Reference Voltage: 2-115 Vrms Galvanic isolated. Uses 1 mA maximum/channel.
  • Regulation (VL-L): ±5% max. No load to Full load.
  • Phase Shift: ±0.5° maximum between output and reference @ 0° default/commanded phase, or programmable induced phase shift tolerance.
  • Self-Test: Built-in wraparound self-test.
  • Settling Time: Less than 100 microseconds.
  • Weight: 1.5 oz. (42 g).
Block Diagram

(Click diagram to enlarge)

Documentation
3/24/2021 8:04:18 AM
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