(c) Measure the distance between the two depth nulls Multiply this
surface measurement by
(
) to calculate the depth of the
transmitter If the depth nulls are evenly spaced about the surface
location of the sonde then this calculated depth is very accurate If they
are not evenly spaced or you cannot even find both depth nulls then
the calculated depth is not accurate
Locating a Sonde by Peaking
Set the locating mode to PEAK and
hold the receiver vertical while
searching
(a) Walk the area wherein the sonde
is suspected to be As the signal is
detected move so that the ANR
and bar response increase
(b) While searching rotate the
pointer to maximize the response
as well Assuming the sonde is
resting roughly horizontal the
maximum response should occur
when the pointer is directly
above the sonde and rotated so
that the direction of the sonde is
side to side
If the sonde is positioned vertically
underground then a similar procedure
may be used setting the locating
mode to NULL