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e. Move the DVM HI lead to the “3.7V”
testpoint and record the voltage (disregard
polrity).
f. The voltage measured at the “3.7V” test-
point should be 3.007 times larger than
the voltage measured at the “-1.23V” test-
point. Adjust Rc (which varies the +3.7V
line to attain the proper ratio.
g. Adjust Rb for an indicator display of 32.2°F.
h. Adjust Ra for an indicator display of +196.0°C.
i. Reassemble the indicator.
Perform the zero calibration