Beha-Amprobe AT-7000-EUR Mode D'emploi page 15

3. MAIN APPLICATIONS
IMPORTANT NOTICE, PLEASE READ BEFORE YOU START TRACING
�
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, Line
and Neutral wires), the signal travels in one directions through the first wire and then
returns (with opposite direction) through the second one. This causes 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 Neutral connection method should be used.
The red test lead of the transmitter should be connected to the Line wire of the circuit
you wish to trace and the green test lead to a Neutral wire either directly at the RDC
or at the closest connection point to the RCD as it is possible. Please make sure that Line
wire and separate Neutral are connected to the same RCD, otherwise the RCD will trip.
Proper connection will be indicated by the red LED on a transmitter to light up. If the LED
is OFF, make sure the circuit is energized and the red test lead is connected to Line wire,
and green to the Neutral. The separate Neutral connection creates the maximum signal
strength, because the electromagnetic field created around the Live wire is not being
canceled by a signal on the return path flowing along an adjacent wire (Line and Neutral)
in the opposite direction, but rather through the separate Neutral circuit. Please note
that connecting a test lead to Ground instead of Neutral, will trip the RCD. The ground
connection can be used for circuits that are not protected by the RCD.
11