Omega Vehicle Security 450 manual

at the “-1.23V” testpoint: disregarding polarity indication, record the voltage.

f.Move the DVM HI lead to the “3.7V” testpoint and record the voltage (disregard polarity).

g.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.

h.Adjust Rb for an indicator display of 0.2°C.

i.Set the resistance box to 148.4 ohms.

j.Adjust Ra for an indicator display of +101.0°C.

k.Reassemble the indicator.

l.Perform the zero calibration

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