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The SCD-112D-2 is a 12-channel plug-in signal conditioning card for use in Curtiss-Wright’s EDAU-20XX, CDAU-20XX, and WDAU- 20XX products. The card is intended for applications that require significant signal conditioning flexibility and simultaneous sampling capability. The card provides constant voltage excitation on a perchannel 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 6th order Butterworth filter with a software-specified –3dB frequency falling within broad 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

  • 12 channels per card
  • Simultaneous sampling or divided rate simultaneous sampling (thinning -10 omg) 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 a 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
  • Programmable voltage excitation on a per-channel basis
  • Programmable gain and offset
    • > 10,000 settings from 1 to 1,000


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