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3098 Technical Manual Maintenance & Fault Finding
5-3
d) Meter Faults
These faults can be found by a few simple tests:
I. Spoolbody Assembly: The magnetic drive and pick-up assembly (spoolbody) can be checked visually for problems
and also electrically for continuity, by measuring the resistance of the drive and pick-up coils. The resistance of each
coil should be (72±10)Ω at 20°C.
II. Meter Amplifier: If careful examination of the sensing element and spoolbody assembly does not reveal the cause
of the problem, the amplifier should be replaced. This will show whether the problem is with the amplifier.
Note: A check of the amplifier current consumption is a good indicator of the amplifier’s health.
A further test to check the amplifier is to change the supply voltage across its operating range and check that the time
period does not change.