Amprobe UAT-505 Guide D'utilisation page 19

IMPORTANT NOTICE, PLEASE READ BEFORE TRACING
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Avoiding signal cancellation problems with a separate ground connection
The signal generated by the Transmitter creates an electromagnetic field around the wire. This field is what is
detectable by the Receiver. The clearer this signal, the easier it is to trace the wire.
If Transmitter is connected to two adjacent wires on the same circuit (for example, hot and neutral wires on a
Romax cable), the signal travels in one direction through the first wire and then returns (in opposite direction)
through the second. This causes the creation of two electromagnetic fields around each wire with opposite
direction. These opposing fields will partially or completely cancel each other out, making wire tracing difficult if
not impossible.
To avoid the cancellation effect, a separate ground connection method should be used. The gray test lead of the
Transmitter should be connected to the hot wire of the circuit you wish to trace, and the green lead to a separate
ground, such as water pipe, ground stake, metal grounded structure of the building, or outlet ground connection
of an outlet on a different circuit. It is important to understand that an acceptable separate ground is NOT the
grounding terminal of any receptacle on the same circuit as the wire you wish to trace.
100
999
8kHz
33kHz
50Hz
Radio
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