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Inductive Broadcast Operation - If the inductive clamp is not plugged
in in the IDUCT setting the internal Broadcast antenna is activated,
saturating the area around the Pro881™ transmitter case with a high
frequency field. This field couples to nearby cables and pipes
allowing tracking of even unseen targets. This Broadcast mode can
be used to check open areas for unknown cables, track cables from a
visible valve box to a controller or follow the path of a buried cable
that is not accessible.
How to Determine Depth – Find the null over the wire path and mark
it. Then place the tip of the receiver on the ground at the mark.
Without lifting the receiver tip from the ground, lower the top of the
receiver to approximately a 45-degree angle. Now slowly drag the
receiver away from the wire path until you re-acquire the null. The
distance between the wire path and the newly established null is the
approximate depth of the target. This is the equilateral triangle
method.
Determining Target Accuracy – This is a very easy to perform method
of determining target accuracy. Place the tip of the receiver on the
ground directly over your suspected target location, switch from null
to peak by pressing the mode selection pad. The peak and null
responses will agree if the locate is accurate. If the peak and null are
off by more than a few inches the location is not accurate. Toggling
between the null and peak modes often when locating the wire path
will assure you of accuracy and help build your confidence.
Helpful Hints – Increases in signal strength and/or the size of the area
it is occurring from usually indicates some type of anomaly in the
cabling. Things that could cause this are valves (as described above),
nicks, cuts, bad splices, or cut wires. Cable in good condition does not
normally change the tone or strength, other than a very gradual loss
of reception over distance, but it is possible. Slack loops of extra wire
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