78-9000-5020-0 Rev C 23
− If the continuity of the circuit is very good (the reading on the display is less than
3K Ω and a solid tone from the transmitter is heard) all frequencies can be used to
locate. Always use the lowest frequency available. Lower frequencies are less likely
to ‘bleed over’ to other cables in the same area, and are very good for tracing over
long distances.
− If the circuit reads more than 3K Ω, but less than lOK Ω (indicated by a beeping
tone from the transmitter) it will be necessary to use a higher frequency than 577 Hz
in order to locate the cable/pipe.
− If the circuit reads more than lOK Ω, it will be necessary to use an RF signal such
as 33 kHz, 82 kHz, 133 kHz or 200 kHz.
− If there is no tone and the transmitter indicates that there is an open circuit (OL in
the display) this could be an indication of a poor ground, or an open-ended cable or
pipe. Use one of the higher frequencies available, at high or maximum level. If it is
an open-ended cable or pipe, the receiver's response will decrease suddenly at the
site of the clear or severed end.
Note: In the ohms mode, the transmitter can detect voltage as well as ohms. If a low
voltage is detected, the Digital Display [T-4] will alternate between displaying ohms
and volts. When displaying ohms, the ag over the Ω symbol will be visible. When
displaying volts, the ag over the ‘V' will be visible. When the voltage magnitude
is sufcient to impair the accuracy of the ohms measurement, only voltage will be
displayed. If the voltage is AC, a sine wave will be visible on the Digital Display [T-4].
If a high AC voltage is detected, a rapid beeping tone will be heard.
• Press Trace [T-3] repeatedly until the desired frequency appears on the display. Note
that the number that ashes alternately with the selected frequency is called the relative
current. This number can be useful in identifying the target cable/pipe and is discussed
more in 8. Depth and Current Estimate and 10. Locating in Directional Peak Mode.
• Press Output Level [T-5] to select high, or maximum, output level for longer tracing
distances or deep pipe/cable.
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