Amprobe AT-4000 Advanced-Wire-Tracer User Manual
Page 15
Finding Opens
‘Opens’ are dead-end conductors that are not connected to anything and therefore do not
pass current. To find an Open, use the T-4000 transmitter, R-4000 receiver, and the
alligator clip cord set. (Refer to figure 15)
1. Plug the two banana plugs into the T-4000
2. Connect one of the alligator clips or the grounding test lead to a separate ground.
3. Connect the other alligator clip to the conductor.
4. Where possible, ground any other conductors sharing the same path as the Open wire.
5. Turn the T-4000 ‘ON’ by pressing the ON/OFF push button and select a signal level
transmission by pressing the signal level push button.
6. Turn the R-4000 ‘ON’ by pressing the ON/OFF push button.
7. Select ‘OPEN’ mode by pressing the MODE push button( the LED must be ‘ON’).
Note: If the conductor is buried in moist soil, the ‘SHORT’ mode may give better results.
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.)
13
T-4000
R-4000
Fig.15 Tracing Open Wire