TROUBLESHOOTING - TM-9-6625-2803-14-P0014

TM 9-6625-2803-14&P

8.0

TROUBLESHOOTING

If trouble is suspected, the fuses should first be checked.

8.1

Access to these fuses can be obtained by removing the outer

panel screws and lifting the panel out of the case. A spare

A blown fuse can be

set of fuses are mounted in the case.

diagnosed using an Ohmmeter to measure its continuity.

8.2

Additional troubleshooting should be done in a Base shop

Currents can be applied to the

containing adequate Standards.

If the trouble

Ammeter, and the various switch ranges tested.

is in the current range, recalibration or the meter, or its

Operation on some

replacement, can be performed if required.

switch positions, but not on others, would indicate that the

switch has to be replaced.

8.3

If the problem is in the Voltmeter, application of standard

voltages can identify whether the problem is in the meter itself,

These parts can then be

the switching, or in the transformers.

replaced as indicated.

The Frequency Meter can be checked on each range using a

8.4

The transducer adjustments can be

standard frequency source.

If this is not

used to bring the meter into calibration.

possible, the meter itself should be checked and replaced as

If the meter is alright, the transducer should be

indicated.

replaced.

The Watt/Var Meter should be tested by applying a standard

8.5

three phase voltage and load.

Slight calibration adjustment can

be performed on the wattage transducer.

Large errors are a

If it

cause which requires that the meter movement be tested.

is okay, the transducer should be replaced.