Depth Measurement When Using the Sonde
Once the SONDE has been located, the depth can then be found. Refer to the figure below for a reference.
Start by moving the RECEIVER along the path behind the SONDE with the antenna in line with the SONDE and
find a NULL between the PEAK ghost signals. Mark this point (A). Then move the R
ECEIVER along the path
in front of the S
ONDE and find another NULL. Mark this point (B). Next, measure the distance between these
two points. The depth of the pipe is 0.7 times the distance between the two points.
The 8879 is specially designed to measure the SONDE depth digitally. To use this feature, the RECEIVER must
be placed in the position shown in the diagram above. The RECEIVER antenna must be in line with the
SONDE. The RECEIVER must also be in the SONDE mode. Locate the SONDE as described previously. When
the S
ONDE has been located, press the DEPTH button. The LCD display will indicate dEP, SON and display
the depth of the SONDE in feet or meters.
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