Precision Measurement Engineering, Inc.

Discussing the Hardware

OFFSET AND GAIN BLOCKS

These two circuits and analog signal processors that implement

Vad = (256/NGAIN) * (NOFF/256 +/- Vin)

where

Vad - circuit output voltage

Vi - circuit input voltage

NGAIN - gain integer, 0 to 255

NOFF - offset integer, 0 to 255

Sub-ranges of channel voltage ranges can be mapped to the full A/D input voltage range by proper selection of  NOFF and NGAIN. SCAMP internal software sets NOFF and NGAIN for each channel prior to A/D conversion of the channel. Thus each of channels 0 to 15 can have its own scaling using the same circuitry. Channels 16 to 31 do not have this scaling ability.