Omega Engineering 450 Series User Manual page 28

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
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