14
Turn the transmitter on by pressing OHMS [T-2]. The continuity of the circuit
will be measured. The results are displayed [T-4] in ohms and as a tone.
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 10KΩ (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 10K
Ω, it will be necessary to use an RF signal
such as 33 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 the highest possible frequency available, at
high 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 display will alternate between
displaying ohms and volts. When displaying ohms, the flag over the
Ω
symbol will be visible. When displaying volts, the flag over the ‘V’ will be
visible. When the voltage magnitude is sufficient 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 display [T-4]. If a high AC voltage is
detected, a rapid beeping tone will be heard.
Press the TRACE [T-3] to select trace mode. Press [T-3] again to select the
frequency.
Press OUTPUT [T-5] to select high output level for longer tracing distances
or deep pipe/cable.
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