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SeekTech SR-60
If desired, force the sound to re-center at a medium level (in any
mode) by pressing the Select Key during operation. See also the
Directional Sound section, below.
Key Items in Using the SR-60
PROXIMITY SIGNAL reflects the proximity of the locator to the
target utility; the closer the locator moves to the center of the
detected field, the higher the Proximity Signal number gets. The
Proximity Signal is calculated from the ratio of the signals re-
ceived at the lower and upper antennas, adjusted for scalability.
SIGNAL STRENGTH represents the strength of the field being
detected by the lower antenna node of the SR-60, converted
mathematically for scalability. In a clear and undistorted field,
you can locate based on Signal Strength alone.
DISTORTION is the degree to which the field detected is de-
formed. In an undistorted environment, current on a long con-
ductor produces a field which is cylindrical, down the conduc-
tor. If multiple fields are present, the detected field is pushed
or pulled out of shape and the different antennas will pick up
different field strengths. On the SR-60, distortion is reflected by
the Tracing Line growing unfocused instead of sharp, or by disa-
greement among the Guidance Arrows, Tracing Line, and Signal
Strength.
TRACING LINE indicates the direction and degree of distortion
in the detected field.
GUIDANCE ARROWS are driven by the signals received at the
guidance antennas of the SR-60. When the fields detected by
these side antennas are equal, the arrows will center. If one
is receiving a stronger field signal than the other, the arrows
will point toward the probable center of the target conductor.
Moving in the direction indicated by the arrows will bring you
closer to the center of the detected field. A small "guidance line"
at the end of a guidance arrow indicates the degree of alignment
with the conductor's field. It will be at its maximum length when
correctly aligned with the conductor, with the guidance antenna
axis crossing the field at 90°. Rotational guidance arrows on the
perimeter of the screen will indicate the direction you need to
turn to align with the detected conductor.
DIRECTIONAL SOUND from stereo speakers will let you follow a
line by sound, while staying visually alert for nearby traffic or ob-
stacles. The Sound Pointer speakers are designed to be clipped
to a jacket or vest on either shoulder.
14
Stereo sound from the speakers will fade to the left or right. The
louder side indicates the direction toward the center of the de-
tected field. Sound will balance when over the center of the line.
The operator can stay centered on the line using sound signals
instead of the visual cues on the screen. The SR-60 comes with-
clip-on speakers designed to be attached to the left and right
shoulders of a safety vest for this purpose.
Shutting Down
Pressing the Power Key at any time during operation will start a
count-down of 3 seconds, during which the shut-down tone will
sound. At the end of the count-down, the SR-60 will shut down.
Line Tracing with the SR-60
There are two major ways to look for lines underground with the
SR-60. They are called Active and Passive. The difference is that
in Active Line Tracing, a current is placed on a conductor using a
transmitter, and that specific signal is then sought for using the
locator. Passive tracing does not use a transmitter and seeks for
any signal that may be picked up at particular frequencies.
Active Line Tracing
In active line tracing, underground lines are energized with a
Line Transmitter. This active signal is then traced using the SR-60.
A Line Transmitter is different from a Sonde in that it is used to
energize a conducting target line, rather than acting as a target
for a locate itself, the way a Sonde does. Line transmitters ener-
gize lines by direct connection with clips, or by directly inducing
the signal using a clamp, or by inducing the signal using induc-
tive coils built into the transmitter.
Ridge Tool Company
Figure 19: Count-Down Screen
(Shutting Down)
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