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4 Using the vLoc3-DM Receiver
Log
0
0.78m
233mA
50°42′59.90570′′N
3°26′35.54358′′W
27.50m
0
SD
233mA
2
Continue to locate, pinpoint, and trace.
4.11 Using the A-frame Fault Finder
The A-frame is used to pinpoint coating defects along the pipeline. It does this by measuring the voltage in the ground caused by
the vLoc3-DM signal current entering the pipe at a fault. It is necessary to make physical/electrical contact with the ground. The
A-frame has two spikes to facilitate this. Although the spikes are a few inches long it is usually only necessary to puncture the
ground with the spikes. Fully inserting them is only necessary where the ground conditions are particularly dry or high resistance.
The A-frame should be plugged into the accessory port. The receiver will automatically recognize the A-frame and enter the fault
find mode. The display will be similar to the one below:
96 dB
98Hz
3+6Hz
1
0.00m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
Locate frequency
8
Distance from last saved DM current reading
2
Locate signal strength indicator
9
Record data point key
3
Left/Right cable location indicator
10
Graphing options soft key
4
Fault direction indicator
11
Graphing area
5
Compass line direction indicator
12
DM FF frequency
6
Press to delete log
13
Fault find signal level
7
Log number
14
Peak signal level indicator
