Compliance West GFM-40ac, Instruction Manual

Page: 18 / 19

14
Troubleshooting Guide
Problem encountered Possible Solution
Meter deflects, then returns to zero when tester
is turned on and turned off.
Normal operation. The meter movement is fully protected
and swings will not harm it
.
Unit will not pass Voltage Zero adjustment
when the EUT has a non-detachable
power cord
Cord is too long. Check Table 1-2.
Blue light does not light. Blue light is the pilot light for secondary AC power. Check
for proper operation. If unit does not work, check supply
voltage and fuse F1. If unit works correctly, check pilot light
and replace if necessary with a 14V type 73 bulb.
Meter will not fully deflect on Amps scale. Check for full voltage deflection. If meter fully deflects, go
to next paragraph. If not, service is required.
Perform voltage zero adjustment with supplied IEC cordset.
If meter fully deflects during this adjustment, the resistance
in your test setup is too high. Check for open grounding
circuit or excessive lead resistance.
Voltage Zero adjustment not effective (voltage
drifts when current is varied)
Rerun Voltage Zero adjustment making sure the connection
between the alligator clips is very tight.
Check EUT for degradation of grounding path under high
current.