NOYAFA NF-816 - Manual (Page 5)

D. Tracking Behind Walls
Hold the receiver in one hand and the antenna in the other. Position
the antenna flat along the wall and at a right angle to the wire, approxi
-mately five feet away from the transmitter. Gently sweep around the
subject area until a PEAK signal is found. Follow the PEAK signal to
track the path of the wire.
Peak signal will become
weaker as the antenna
gets further away from
the path of the wire.
Adjust the receiver
gain first, then if
necessary, also adjust
the transmitter output
for best results.
(Fig.02)
C. Measuring Depth
Once the path has been
determined, mark the ground
at a null point along the path.
Hold the receiver antenna at
a 45-degree angle to the
ground and move at a right
angle away from the path of
the wire until another null is
found. Mark this point.
The distance between the
two marks is the approximate
depth of the wire.(Fig.01)
Fig·01-Measuring Depth
Receiver
Antenna
Null
Points
45
。
Ground Level
Cable or Pipe
Fade
Peak
±5 Feet
Fade
NF-816
Your excellent helper in cable test! 3