LOCATING SHEATH FAULTS
Transmitter Setup
Remove both the near-end and far-end shield bonds from the test
section. Perform a battery test then with the Transmitter off, connect
the Black clip to the ground rod. Place the ground rod behind the
Transmitter, away from the faulted section, and in line with the cable
path. If necessary, extend the ground lead with the Ground Extension
Cable.
Attach the Red clip to the shield. Press to turn the Transmitter
on in the Ohms mode . Measure the fault resistance. The results
are displayed in ohms. Note that failure to disconnect the shield bonds
at either the near-end or the far-end produces a heavy fault indication.
Press
again, to select the Fault mode . For maximum fault
sensitivity, select high output level by pressing .
Receiver Setup
Press to turn the Receiver on.
Press to select Fault mode . Connect the Earth Contact
Frame to the accessory jack on the Receiver using the earth frame
cable. Near the location of the ground rod (about one step away), insert
the frame probes fully into the ground with the green-banded leg
towards the fault and in line with the cable path. Press to record a
fault level reference visible in the lower left corner of the display. The
Receiver bar graph is visible on the right side (green).This indicates
that the fault is ahead of the operator in the direction of the green-
banded leg. Continue along the cable path, re-inserting the frame
probes every few steps while watching the Receiver bar graph. When
the bar graph is visible on the left side (red), the fault has been passed
and is now behind the operator. Move back, inserting the frame every
few inches, until the bar graph returns to the green side. Turn the frame
ninety degrees to the cable path. The fault is located beneath the center
of the frame when the bar graph changes from one side to the other.
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