RD4000 Locating System User Manual
Page 57
Checking the depth of a sonde
Electronic depth measurement.
Pinpoint the sonde following procedures 1-4 above. Adjust sensitivity
to bring the bargraph indication on scale. Switch the receiver to
sonde depth indication. Depress the depth measurement key and
read the depth on the display.
Note: If the receiver is not set to sonde mode, the unit will still work
but the depth indication will not be correct.
Calculation method.
Pinpoint the sonde. Move the receiver in front of the sonde and still
with the antenna in line with it, increase sensitivity to find the peak of
the ghost signal. Move the receiver to behind the sonde ensuring that
the receiver blade is always in line with the sonde. Find the null
positions A and B. Measure the distance between them and multiply
by 0.7 to give an approximate depth measurement.
Types and range of sondes
Standard sonde.
The standard sonde combines compact size with a strong signal and
is the standard sonde for most applications unless a smaller size,
greater depth, or rugged construction sonde is required.
A
B
d=0.7AB
d
d
105mm
Ø 39mm
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