Using The A-Frame To Pinpoint A Fault; Preparing A Cable - Amprobe AF-600 Manual De Usuario

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6. USING THE A-FRAME TO PINPOINT A FAULT

�WARNING
Always be aware of the location of buried utilities (especially buried power lines) when pushing the spikes of
the A-Frame into the soil.
The spikes of the A-Frame are sharp. Always handle carefully to avoid injury.
The A-Frame is used to detect ground faults on cables and pipes. In the case of cables, faults are usually
caused by insulation damage allowing the metallic sheath or internal conductor to become in contact with the
ground. In the case of pipes, the faults consist of coating defects.
The A-Frame works in conjunction with the UAT-600-T Transmitter. The Transmitter is used to apply a fault find
signal to the utility under test, and the A-Frame is used to receive the signal and pinpoint a place of the fault.

6.1 Preparing a Cable

1. Disconnect and isolate the cable on both ends. Make sure to disconnect all ground bonding. This will ensure
that the test signal traveling through the ground fault is not masked or doesn't interfere with the one
conducted by grounding bonding to the ground. The A-Frame cannot distinguish between these two signals.
2. Use the resistance measuring function on the Transmitter, or a dedicated resistance measuring device, to
identify a cable with a fault to ground. The A-Frame will typically detect faults up to 2 MΩ (depending on
the distance from the Transmitter, soil conditions, etc.).
When at A-Lo / A-Hi mode, the
circuit under test, the Ω measurement will be opt out under MENU screen.
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Tx
� Use caution when above voltage indication warnings are ON.
indicator will blink. In case of a voltage presence ≥10 V (typical) on the
Terminals for direct connection and signal clamp
Tx
Hazardous output voltage indicator.
The icon on the screen indicates the transmitter is
outputting voltages ≥30 V.
Protection fuse
Hazardous voltage indicator (over 30 V)
The red solid light indicates the presence of AC voltage ≥30 V
on the circuit under direct connection mode.
The red blinking light indicates the presence of voltages
above 30 V on the Transmitter terminals under A-Lo and A-Hi
mode (generated and/or measured). In case of the presence
of line voltage >50 V (typical) during the operation of A-Lo or
A-Hi mode, the transmitter automatically disables A-Lo and
A-Hi modes, the red solid light indicator appears.
� Always check the presence of voltage on the circuit by
additional voltage tester.
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