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SeekTech SR-60
Pole
Ground
Figure 34: Dipole Field
When locating a Sonde, first set up the locate:
Activate the Sonde before putting it in the line. Select
the same Sonde frequency on the SR-60 and make sure
it is receiving the signal.
After the Sonde has been sent into the pipe, go to the suspected
Sonde location. If the direction of the pipe is unknown, push the
Sonde a shorter distance into the line (~15 feet (5m) from the ac-
cess is a good starting point).
Location Methods
There are three major parts to locating a Sonde. The first
step is to localize the sonde. The second part is pinpointing.
The third is verifying its location.
Step 1: Localize the sonde
Hold the SR-60 so the mast is pointing outward. Sweep
the antenna mast in the suspected direction of the
Sonde while observing the Signal Strength and listen-
ing to the sound. The signal will be highest when the
mast is pointing toward the Sonde.
Lower the SR-60 to its normal operating position (an-
tenna mast vertical) and walk in the direction of the
Sonde. Approaching the Sonde, the Signal Strength will
increase and the audio tone will rise in pitch. Use the
Signal Strength and the sound to maximize the signal.
Maximize the Signal Strength. When it appears to be at
its highest point, place the SR-60 close to the ground
over the high-signal point. Be careful to hold the receiv-
er at a constant height above the ground as distance
affects Signal Strength.
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Pole
If while "getting closer" the Equator appears on the screen, fol-
low it in the direction of an increasing Signal Strength to localize
the Sonde.
If a Pole appears before the Equator appears, localize the Sonde
by centering the Pole in the cross-hairs.
Step 2: Pinpoint the Sonde
The Poles
nal point, an equal distance on either side if the Sonde is level.
If they are not visible on the screen at the point of maximum
Signal Strength, move from the maximum point perpendicular
to the dotted line (Equator) until one appears. Center the locator
over the Pole.
Where the Poles occur depends on the Sonde's depth. The deep-
er the Sonde, the further away from it the Poles will be.
The dotted line represents the Equator of the Sonde. If the
Sonde is not tilted, the Equator will intersect the Sonde at
maximum Signal Strength and minimum Measured Depth.
Note: Being on the Equator does not mean that the loca-
tor is over the Sonde. Always verify the locate by maximiz-
ing Signal Strength and marking both Poles.
Ridge Tool Company
Note the Signal Strength and move away from the high
point in all directions. Move the SR-60 far enough in all
directions to verify that the Signal Strength drops sig-
nificantly on all sides. Mark the point of highest Signal
Strength with a yellow Sonde Marker (clipped to anten-
na mast for convenience). This is the suspected Sonde
location.
Figure 35: Poles and Equator of a Sonde
should appear on either side of the maximum sig-
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