C-SCOPE L2 Series Instruction Manual page 48

Signal Current Measurement (MXL2 Locator only)
Signal Current Measurement can also help to identify the layout of pipe and cable networks
as the main line after a 'T' will have most of the Signal Current remaining on it whereas the
shorter connection will have correspondingly less.
The Signal Current reading should also reduce at a uniform rate as the distance from the
Generator/ Transmitter increases. A sudden drop in Signal Current, in a short distance,
indicates a change to that service such as an unknown connection, an insulated joint or
a break in the pipe or cable.
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