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8. When starting a locate, you need to “prelocate” the targeted conductor by using the broad
range PEAK method first to find the general location of the line. Then hone in on the exact
location of the conductor with the precision NULL method.
5.2.2
Peak Method
The PEAK method gives a maximum (loud tone) signal. Hold the receiver by the handle in a
vertical position and move it from side to side. The audio tone and field strength will increase as
you approach the location of the conductor.
Peak VM-480B Receiver Response
5.2.3
Null Method
To pinpoint the location of the conductor use the NULL method by holding the VM-480B receiver
in a flat, horizontal position. The audio tone will increase and then go silent at the exact location
of the conductor.
Null VM-480B Receiver Response
MAX
MIN
MAX
MIN
Rx
Tx
volume of receiver
tone as pipe is
crossed.
Locating Pipe
MAX
Rx
Tx
MIN
MAX
MIN
volume of receiver
tone as pipe is
crossed.
Pinpointing Pipe
5 Operation
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