Ridgid SeekTech SR-20 User Manual download pdf (Page 13)

Ridge Tool Company

Tools For The Professional

seekTech sR-20

• While tracing, the mapping display operates best under

the following conditions:

The line is level

2. The SR-20 Locator is above the target utility elevation

3. The SR-20 antenna mast is held approximately

vertical

If these conditions are not met, pay close attention to

maximizing Signal Strength.

In general, if the SR-20 is used in a zone over the target

line within a sweep area of about two “depths” of the line,

the map will be useful and accurate. Be aware of this when

using the map if the target or line is very shallow. The width

of the useful search area for the map can be small if the line

is extremely shallow.

Measuring Depth (Line Tracing Modes)

The SR-20 calculates Measured Depth by comparing the

strength of the signal at the lower antenna to that at the

upper antenna.

Measured Depth is measured correctly in an undistorted eld

when the bottom antenna is touching the ground directly

above the signal source and the antenna mast is vertical.

To measure depth, place the locator on the ground,

directly above the Sonde or the line.

Measured Depth will be shown in the lower left hand

corner.

A Measured Depth reading can be forced by pressing

the Select Key.

Measured Depth will be accurate only if the signal is

undistorted and the antenna mast is held vertical.

Testing for the consistency of the Measured Depth reading

can be done by raising the SR-20 a known distance (say,

12 inches (33 cm)) and observing whether the Measured

Depth indicator increases by the same amount. Small variation

is acceptable, but if the Measured Depth does not change, or

changes drastically, it is an indication of a “distorted” eld, or

very low current on the line.

NOTE: In Active Line Trace or Passive Line Trace modes,

pressing and holding the Select Key will force a Measured

Depth reading and will force the Signal Angle indicator to

change to Current. If sound is set on, it will also recenter the

audio tone.

Current and Signal Angle Reading

The Current Strength (mA) and Signal Angle indicator

( ) in the upper right corner of the screen will display the

current detected on the traced line, in milliamps, when the

computed angle to the center of the detected eld is less

than 35° and the SR-20 crosses the center of the eld as

sensed by the guidance arrows.

When moving across the center of the eld the current display

will “latch” the displayed current value (retain it in the display)

until the guidance arrows reverse again, at which point the

latched display will be updated. The update and latch cycle

occurs whenever the guidance arrows reverse.

When the angle to the center exceeds 35°, the Signal Angle

indicator will again replace the Current indicator, and the

display will show the computed angle to the center of the

detected eld.

Clipping (Tracing Modes)

Occasionally the Signal Strength will be strong enough that

the receiver will be unable to process the whole signal, a

condition known as “clipping”. When this occurs, a warning

symbol

will appear on the screen. It means that the

signal is particularly strong. If clipping persists, remedy it

by increasing the distance between the antennas and the

target line OR by reducing the strength of the current from

the transmitter.

NOTE: Measured Depth Display is disabled under clipping

conditions.

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Ridgid SeekTech SR-20 User Manual Page 13

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