GFL-Series User Manual V1.1
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helps to reject noise and interference. Stray capacitance in the system will permit a
small current to flow; filtering will also minimize the effect of this.
The direction of current flow in Figure 4-10 (
I direct.:
) is shown with reference to the
arrow on the current clamp. That is, if the current flow (and therefore the fault current) is
in the direction of the arrow on the current clamp, a green arrow pointing to the right will
be shown. The red arrow indicates no significant signal is detected. Allow a few
seconds for the reading to stabilize after fitting the clamp.
5.2 Tracing a ground fault
The Signal Generator should be connected to the system under test as described in
Section 4.2.3. The fault is traced by following the current from the signal generator
through the wiring system until the faulty branch is located. Figure 5-1 shows how a
fault can be traced by moving the clamp by following the green arrow, until the faulty
branch is isolated.
In Figure 5-1, the first clamp position (1) the arrow on the display indicates that the
current flow
– and therefore the fault current, is present in this branch of the circuit.
Therefore, the clamp is moved to the next position (2). Here the arrow indicates the
fault current isn’t present here, so clamp is moved to position (3) and so on until the
faulty branch is isolated at position 7.
It is not necessary to separate positive and negative cables; the clamp may be placed
around several cables during the fault tracing process.