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The SCD-108D-4 is an 8-channel plug-in signal conditioning card for use in Curtiss-Wright’s EDAU-20XX, CDAU-20XX, and WDAU-20XX products. It is intended for applications requiring significant signal conditioning flexibility and simultaneous sampling capability. The card provides constant voltage excitation on a four-channel basis, programmable presample filtering, calibration, and user-programmable gain. The user may select between digitally implemented FIR and IIR filters. All filters are 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). Alternatively, a filter with a user-specified -3dB frequency that falls within limits calculated by TTCWare™ may be selected. 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 a 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 or on software selected -3dB frequency (6 pole Butterworth characteristic only)
    • 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


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