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7. Set the receiver MODE Switch to "Active".
8. Because the receiver is operating close to the transmitter, the receiver will detect the
transmitter output by air coupling and emit a tone. In order to cancel the air coupling the
receiver must be positioned exactly perpendicular to the transmitter: The operator must be a
least 15 feet from all metal objects, pipes, fences, cars, etc.
Hold the instrument at arms length, parallel to the ground with the receiver facing up as shown
in below graphic. First turn the topmost knob clockwise until full tone is indicated and the spring
is compressed. Then turn this same knob in a counterclockwise direction until you have a zero
audible and visual signal. Continue to turn through this “no signal” area until a slight signal is
heard and the visual indicator reads within the “SET” area. Leave the topmost knob at that
position. If you are unable to find a “no signal” area, lower the sensitivity.
Adjusting for Audio Balance
5.7.2
Locating with the Handle-Mounted VM-480B
1. Holding the handle-mounted VM-480B with the receiver face up and the transmitter on the
back end, start traversing the area you need to blind search.
2. As you cross a conductor at right angles - the point of maximum audio and visual signal, make
a mark on the ground.
3. Continue to walk in the same direction until "no signal" is registered. At this point make a
180 degree turn and walk back over the same path until the maximum signal registers on
the meter and audio tone again. Make a second mark on the ground at this point. The true
location of the conductor is midway between the two marks.
Rx
Tx
Tx
5 Operation
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