Users Guide
63
Due to the distance between the two test points, the supplementary measurement cable
that you will have to use for at least one of the test points will be long. To avoid noises,
you must use a shielded cable which shield must be connected to the YELLOW tip of the
equipment test cable.
* The level of the measurement input V1 is very low so a cable with a
special connector is used (supplied with the equipment) to shield the
measurements well from possible electromagnetic noise. In ambients
where there is loud noise, the tip of the YELLOW cable (Earth) must be
connected to the earth of the system, or at least to the BLACK tip of the
measurement cable.
Test:
Select and inject 300 A current. Maintain the current for a few minutes to give time for
any possible fault point to open, if this is the case.
Stop the current injection and test by clicking on the button of the dial.
The voltage measured by the Display V1 must be divided between the meters that
separate the two earth taps to be tested. If the result is more than the value of 0.1 V/m,
this indicates a problem in the ground grid.
If the 300 A current cannot be reached, or it can be exceeded with your configuration,
convert your criterion into V/m that can be reached according to the following formula:
Itest *0.1/300
Carry out this test with the highest possible injected current (always bearing in mind the
capacity of the test cable). Thus it will be closer to the reality of the values that can be
reached in an earth fault.
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