Finding Ground Faults - Amprobe AT-4003-A User Manual

8. Select the 'HIGH' sensitivity by pressing the SENSITIVITY push
button (the LED must be 'ON').
9. Starting from the T-4000, trace the conductor. The open will be at
the point you begin to lose signal. At that point, select the 'MID'
sensitivity mode (the LED must be 'blinking') in order to pinpoint
the exact location of the Open.
10. Repeat process from the other end of the wire to make sure that
you trace the right wire.
If you end up tracing the entire length of the wire without locating
the open, you may experiencing capacitive coupling, or 'Signal bleed-
off' onto the adjacent conductors. This condition may be alleviated
by: a) grounding all adjacent conductors; b) minimizing the distance
between the point of connection and the open.
If another conductor is connected to the first conductor somewhere
along its length, the signal will split between them, causing both
conductors to emit half the signal each. The B2024 battery or the
B2025 converter can be used to increase the signal strength. (Note:
When using the battery booster (B2024 or B2025) the unit will work in
ultra high "U-HI" mode only. Remove the battery booster to return to
normal operation.)

Finding Ground Faults

A ground fault is a direct connection of the conductor to ground. A
typical ground fault may cause a tripped circuit breaker or a blown fuse
( in contrast to an 'open', which passes no current). In this situation,
the B2024 battery can be used as the current source. The high voltage
from the B2024 will overcome a high resistance fault and will produce
a stronger signal. Also, you can use line voltage as the power source
by connecting the T-4000 across the breaker. (Note: When using the
battery booster (B2024 or B2025) the unit will work in ultra high
"U-HI" mode only. Remove the battery booster to return to normal
operation.)
1. Plug the alligator clip cord set into the T-4000.
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