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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3M 2273 manual Locating Sheath Faults, Transmitter Setup
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