© 2023 Radiodetection Ltd 34
When using Null arrows:
Use the arrow heads to place the locator above the NULL
point. If the Peak response is not at a maximum, then this
is evidence of a distorted field. If the Peak response is at
its maximum level where the Null point is located, then
there is no or very limited distortion present.
In Peak+ mode the following indicators are displayed by
the LCD:
Right and left arrows
Signal strength
Compass
Current
Depth
To select Peak+ mode:
1 Press the key until the Peak+ mode icon is
displayed on the LCD
Guidance mode
Guidance mode offers good performance in distorted
fields and provides three indicators to guide the user
towards the target line.
The Left and Right Proportional Arrows become shorter
as the locator approaches the target, and the Target
Position Needle will move towards its central position. The
Signal Strength reading will also reach its maximum value
when the locator is positioned above the target.
Any deviation from all three indicators showing the target
position in the same location could signal the presence of
a distorted field.
In Guidance mode the following indicators are displayed:
Proportional left and right arrows
Target Position Needle
Signal strength
Gain
Compass
Current
Depth
To select Guidance mode:
1 Press the key until the Guidance mode icon
is displayed on the LCD
Broad Peak mode
In Broad Peak mode, the RD8200SG locator uses a single
antenna to detect with higher sensitivity over a wider area
than Peak mode. This is particularly useful for locating
deep utilities quickly and indiscriminately. In Broad Peak
mode the following indicators are displayed by the LCD:
Depth
Current
Signal strength
Compass
To select Broad Peak mode:
1 Press the key until the Broad Peak mode
icon is displayed on the LCD.
Null mode
Null mode is used to verify a locate signal in environments
with limited or no interference or distortion. Null mode
gives a null response when it is directly over the line.
In Null mode the following indicators are displayed by the
LCD:
Signal strength.
Compass.
Right and left arrows.
To select null mode:
1 Press the key until the null mode icon is
displayed on the LCD
The sharp, null response can be easier to use than the
Peak response but is vulnerable to interference and
should not be used for locating, except in areas where
there is no interference present.
Guidance Mode offers improved performance in such
conditions while Peak+ mode can combine the Peak
bargraph with Guidance arrows to combine fast and
accurate locate tools.
6.4 Compass
The LCD compass provides a visual indication of the
direction of the target cable, pipe or sonde. The compass
is available for all frequencies apart from Power, Radio
and Passive.
6.5 Trace
Line tracing can be accelerated by switching the locator to
Guidance mode.
Move the locator left and right while walking along the path
of the line to place the target position Needle directly over
the line. As you move the locator over the line, the left and
right arrows (and an accompanying tone) will indicate if
the target line is to the left or right of the locator.
6.6 Pinpoint
Locating a target line in Peak, or Peak+, mode accurately
defines the position of a target line after it has been traced
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