Operation In The Field; Peak Mode; Null Mode - SubSurface Instruments PL-2000 Operation Manual

OPERATION IN THE FIELD

020
Low sound.
Directly over
the pipeline.

1. PEAK MODE

Bar Graph.
080
Maximum sound.
020
Low sound.
Receiver.
In .the .Peak .Mode, .the .pipeline .location .is .
indicated .by .the ."rising .pyramid" .bar .graph, .
by .the .numerical .display .directly .below .it, .
and .an .increase .in .sound .output .
The ."rising .pyramid" .bar .graph .increases .
as .the .Receiver .is .moved .closer .to .the .
pipeline .from .either .side . .If .there .is .no ."rising .
pyramid," .increase .the .sensitivity .using .the .
Up . A rrow .key . .When .the ."rising .pyramid" .
reaches .a .maximum, .the .Receiver .is .directly .
over .the .pipeline .
The .numerical .display .beneath .the ."rising .
pyramid" .and .the .audio .sounds .are .also .
indications .of .the .strength .of .the .signal . .
Both .are .also .at .their .maximums .when .the .
Receiver .is .directly .over .the .pipeline . .Often, .
small .changes .in .the .numbers .displayed .or .
in .the .audio .are .easier .to .detect .than .small .
changes .in .the .height .of .the .pyramid .
16
OPERATION IN THE FIELD

2. NULL MODE

On left side
070
High sound
On left side
On right side
020
Low sound
Low sound
Receiver.
a) Hold .the .Receiver .directly .over .the
pipeline .and .facing .in .the .direction .of
the .pipeline . . A djust .the .sensitivity .with
the .Sensitivity .Up/Down . A rrows .until .the
sensitivity .level .(upper .right .corner .of
display) .is .about .30 .
b) Adjust .the .sound .level .with .the .Sound
Volume .Control .Key .to .a .level .easily
heard .by .the .user . .The .sound .volume
cycles .through .4 .levels .
Middle Low
c) As .the .Receiver .is .moved .closer .to .the
pipeline .from .either .side, .the .sound .level
decreases . .Directly .over .the .pipeline,
the .sound .level .is .at .its .minimum, .and
the small figure jumps from one side of
the .pipe .to .the .other .very .quickly . .This
minimum .point .is .the ."Null" .location .
NOTE: . There .is .no .depth .measurement . .
function .in .the .Null .Mode .
17
020
On right side
Operator's Picture
070
High sound
Stop High