SEFRAM MW9520, Instruction Manual

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(d) Non-contact voltage detection:
The circuit must be connected to mains and
live, and set the receiver to the U
AC
mode to
detect. The AC signals detected by the receiver
in the U
AC
mode indicated only whether the
circuit is live or not. During the search for the
ends of several supply lines, the lines must be
connected separately, one by one. The number
of bars is indication the strength of received
signal emitted depend on the voltage in the
circuit and the distance from the circuit.