Troubleshooting - Extech Instruments 382356 User Manual

Trouble Shooting
1. Snap the jaws open and closed two or three times before turning the meter on
2. Do not clamp on to any device during the power-up initialization sequence.
3. Snap the jaws two or three times after clamping on to the ground electrode or rod.
4. Slight amounts of drift may occur at high resistance measurements. This is normal,
and should not be cause for concern.
Blank display or any failure mode
Replace the battery before proceeding.
Start-up Initialization Failure
The start-up calibration will continue indefinitely if the jaws are open or dirty. Check that the
jaws' mating surfaces are clean. Do not open the jaws while the initialization sequence is
running.
Noise on the Ground Electrode or Rod
If noise is present (over 3A or 30V) on the ground electrode or rod, the word "NOISE" will
appear on the display and readings can no longer be considered accurate. Before the
meter can be used accurately, the noise problem must be addressed.
Reference Test Loop
The reference test loop is a set of resistors that provides a means to check the
performance of the meter.
1. Open the measurement jaws and check that the mating surfaces are clean and free
of dust, dirt, or any foreign substances. Clean if necessary.
2. Clamp the meter around the reference loop as shown in the diagram.
3. Give the meter a few seconds to settle and read the measurement. The meter
should display approximately the same value as marked on the reference loop,
taking into consideration the accuracy listed in the specification chart. If the readings
are not similar to what is marked on the reference loop, consult the Trouble
Shooting and Maintenance sections of this manual.
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382356 V2.0 5/03