Synchro Resolver Cards


  • Available on VME64x bus architectures
  • Up to 2 measurement and 6 simulation channels on single card
  • Common On-board Oscillator for reference signal generation
  • Measurement function
    > Internally Synthesized Reference
    > Software programmable 10-, 12-, 14- or 16-bit resolution
    > Input amplitudes: 2 Vrms L- L, 11.8 Vrms L- L, or 90 Vrms L- L
    > Incremental Encoder Emulation or Velocity Output
    > Transformer isolation for all input channels
  • Measurement function
    > Output Amplitudes 11.8 Vrms L- L for Synchro or Resolver for Simulation function
    > Optional Transformer Isolation
    > Programmable Two-Speed Ratio
    > Software driver support for Windows 2000, Windows XP, Linux, RT Linux

The AT Synchro/Resolver series of products provide fully independent Synchro/Resolver-to-Digital and fully independent Digital-to-Synchro/Resolver channels which are available on 6U VME64x module. Each channel is implemented using DDC converters. A common on-board oscillator eliminates the need for an external reference oscillator. Transformer isolation is available on-board for measurement channels while it is optional for simulation channels.

The card is available in various combinations. Up to 2 measurement (Synchro/Resolver-to-Digital) Channels and 6 simulation (Digital-to-Synchro/Resolver) Channels can be configured. The S/R-D products can be used as Synchro/Resolver simulator to test the equipment, which has Synchro/Resolver interface in it. The D/S-R products can be used for angular measurement applications.


The card is capable of accommodating most military voltages; e.g., 11.8, or 90 Vrms @ 400 Hz. This architecture allows for minimum board count to achieve the maximum functionality in systems that require precision positioning, control and stabilization. Each input channel of S/R-D is independent and can be configured as either a Synchro or Resolver input using on-board jumpers. Each output channel of D-S/R is independent and can be configured as either a Synchro or Resolver output using on-board jumpers.


The AT-VME-SRC software includes
> Virtual Instrument Panels
> Drivers & APIs

Virtual Instrument Panel
The AT-VME-SRC card comes with a “Virtual Instrument Panel” providing interactive control of Synchro/Resolver features. The control interface appears on the computer display & user manipulates these controls with a mouse/trackball or keyboard. The purpose of Virtual Instrument Panel is to help the user (mostly system integrators) to quickly setup & use the card, just like a stand-alone instrument with physical front-end knobs, controls & display without getting into programming intricacies.

Drivers & APIs
The AT-VME-SRC card comes with a powerful set of library functions to access the Synchro/Resolver functionality. The drivers are designed in a modular fashion consisting of component functions & application functions. The user’s test program can be developed with a few calls to the card driver, by using the set of application functions provided. Drivers and high-level API libraries for Windows 2000/XP, Linux, RT-Linux are available.

Synchro/Resolver to Digital

  • Channels: Up to 2 channels
  • Resolution: Programmable 10-, 12-, 14-, 16- bit
  • Accuracy: 2 arc-minute
  • Inputs: Jumper selectable S/R inputs
  • Reference: Separate external reference for each channel
  • Speed: Programmable speed ratios
  • Frequency: 400 Hz

Digital to Synchro/Resolver

  • Channels: Up to 6 channels
  • Resolution: 16-bit
  • Accuracy: 1arc-minute
  • Outputs: Jumper selectable S/R signal outputs
  • Isolation: Optional Transformer isolation
  • Speed: Programmable speed ratios
  • Frequency: 400 Hz
  • Output Drive: 1.2 VA


  • Rear I/O connectivity option provided for VME card
  • Wrap around self-test provided
  • Built-in tests for all I/O channels provided

Software Support

  • Driver support for Windows 2000/XP, Linux, RT-Linux


  • VME: VME64x, 6U size
  • Dimensions: 233mm x 160 mm


  • Operating Temperature: 0°C to + 50°C
  • Storage Temperature: -20°C to + 70°C


  • 1 year limited warranty
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