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The SCD-608D-2 is an 8-channel plug-in signal conditioning card for use in Curtiss-Wright’s EDAU-20XX, CDAU-220XX, and WDAU-20XX products. The card is intended for applications that require significant signal conditioning flexibility and simultaneous sampling capability.

The card provides AC and DC input coupling, constant current and constant voltage excitation, numerous bridge and potentiometer input configurations, programmable presample filtering, calibration, and user-programmable gain and offset. FIR or IIR digital presample filtering may be selected. Each digital filter is phase-locked to the channel format sample rate to maintain time correlation between the input signal and the PCM output. The filter can be set for 3, 4, 5, 6, 8, or 10 times oversampling (the filter -3dB point will be automatically set to the format sampling rate divided by the oversampling value).

The conditioned analog signal is digitized at up to 16-bit resolution for transmission in the system PCM output format.

Key Features

  • 8 channels per card
  • Simultaneous sampling capability
  • Programmable digital FIR or IIR presample filtering
  • Software selected FIR filters: 120, 90, 60, and 40 taps
    • 120 tap FIR filter provides comparable response to 12-pole Butterworth filter
    • Software selected IIR filters: 6-pole and 8-pole Butterworth, 6-pole Bessel, and 6-pole Chebyshev
    • Automatic adaptive filter based on format sample rate
    • Analog anti-aliasing filter
  • Bridge or potentiometer inputs
    • 1/4, 1/2, 3/4, and full configurations
    • On card completion of up to 3 arms
  • Programmable voltage excitation
  • Constant current excitation


  • Flight test instrumentation
  • Factory automation and process control
  • Accelerometers, strain gages, load cells, pressure transducers
  • Research measurements and experiments
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