RIDGID SeekTech SR-20 - Manual (Page 9)

Ridge Tool Company 
Tools For The Professional TM
seekTech sR-20
3. Press the Select Key (shown below) to check the
box for each frequency to be used.
Figure 15: Select Key
Figure 16: Desired Frequency Checked
4. Frequencies that have been selected for use will show
a check in the box next to them.
5. Press the Menu Key again to accept the choice
and exit.
Figure 17: Menu Key
The Main Menu lists all frequencies available for activation.
For information on adding additional frequencies to the Main
Menu so they can be chosen for activation, see “Frequencies
Selection Control” on page 22.
Sounds of the SR-20
The sound level is driven by the proximity to the target. The
closer to the target, the higher the sound pitch will be. A
rising tone indicates increasing signal.
In Active Line Trace or Passive Line Trace mode, sound is on
one continuous curve and does not rescale.
When there is no distortion present, the sound of the SR-20 is
a clear warbling sound when on the left side of the detected
field, with a slight click added when on the right side of the
detected field. If distortion is detected a sound similar to
AM radio static sound can be heard, which gets stronger as
the degree of distortion increases. If the distortion response
feature is disabled, the static sound does not occur.
In Sonde Mode, the pitch will “ratchet” upward. That is, it will
rise and then rescale (fall) in pitch while approaching the
Sonde. Moving away from the Sonde, it will drop to a lower
pitch and remain there as long as one moves away from the
Sonde.
If desired, force the sound to recenter at a medium level (in
any mode) by pressing the Select Key during operation.
Key Items in Using the SR-20
SIGNAL STRENGTH represents the strength of the field being
detected by the lower antenna node of the SR-20, converted
mathematically for scalability. In a clear and undistorted field,
you can locate based on Signal Strength alone.
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 received at the lower and upper antennas, adjusted
for scalability.
DISTORTION is the degree to which the field detected is
deformed from the simple circular shape of an ideal magnetic
field caused by current in a long conductor. 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. Distortion is reflected by the Tracing Line growing
unfocused instead of sharp on the display screen.
GUIDANCE ARROWS are driven by the signals received at the
side-wheel antennas of the SR-20. 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.