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DLx

3, 2 or 1 Channels, 0.5 VA, 1.5 VA or 3.0 VA

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:

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 (1.5 VA per channel, max.).

Single-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.

Specifications
  • Number of Channels: Model dependent. See Model Designations table below.
  • Resolution: 16-bits (.001526% FS)
  • 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)
  • Output Format: Configurable for either 3/4-wire or 2-wire. Galvanically isolated. Output voltage is programmable fixed or ratiometric.
  • Output Voltage: Programmable, model dependent. See Model Designations table below.
  • Output Load: 10 kΩ minimum typical. Short circuit protected. Model dependent. See Model Designations table below.
Block Diagram

(Click diagram to enlarge)

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