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Sonde Locating
A sonde is a small transmitter that enables the user to trace metallic and
nonmetallic pipes, sewers, drains, or ducts. It can also be used to find a blockage
or collapse. Refer to sonde manufacturer’s guide for proper selection of sonde
for the desired application.
A representation of a sonde transmission field appears below.
There are typically three peak signals present. The strongest peak signal is over
the center of the sonde. The signal will drop off each ‘side’ or ‘end’ of the sonde,
and then rise again. The ‘drop off points’ are referred to as nulls.
Sonde Locating Screen
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1. Speaker Icon – Indicates audio level
2. Bar graph – Graphical representation of received signal
3. Antennae Icon – Indicates single peak mode
4. Selected Sonde Frequency – Toggles through activated sonde frequencies
(512, 640, or 33 k)
5. Sonde Icon – Indicates sonde mode vs. line locating
6. Battery Icon – Indicates battery level of receiver
7. Signal Level – Numerical reading of received signal (dB)