Mantracourt ICA1H User Manual page 18

6. Fine Span (Gain) and Zero (Offset) Adjustment Problems
a) If the adjustment cannot reach the maximum output desired then, check the tare is not too high.
b) If the potentiometer does not alter the output the unit must be repaired – remove from service.
c) It is always wise to check a known good ICA against the problem installation before rejecting the suspect ICA.
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Mantracourt Electronics Limited – ICA User Manual