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Each channel must be calibrated individually by either simulating desired zero and span
calibration resistance values or by actually placing the channel’s RTD into an actual
precision temperature generator. Ice water is an acceptable method for generating the
0°C zero temperature value. Upscale span values are best simulated with an RTD
calibrator. Since RTD’s are stable and repeatable of over long time periods calibrations
normally only need to be performed upon initial installation. Since the PCB has 8
channels, two are required for 16 channel applications. JP25 configures inputs for
channel groups 1-8 or 9-16.
Figure 3.6
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