NR-2000 User Manual
21
To do this alter antenna module position and orientation, variate the
probing signal emitted power with PWR
(+,-
) buttons, and change the
receiver sensitivity with ATT (+,-) buttons.
Use SND button to switch over receiver outputs to compare second
and third harmonic levels and to identify the source of the response
signal.
USEFUL HINT:
If the second harmonic signal level is considerably higher than that of
the third one, it is highly probable that there are certain industrial
semi-conductor components within the detection area.
If the third harmonic signal level substantially exceeds the second
harmonic level, a corrosive nonlinear scatterer is the most likely to be
the source of the response signal.
20K mode is used to identify a detected object. Natural corrosive
nonlinear scatterer (two metal items divided by an oxide layer) has an
unstable junction.
Under mechanical impact (tap) in close vicinity of detected nonlinear
junction Operator will hear a wheeze and cracks in the headphones that
corresponds to above mentioned impact.
A man-made target (electronic device, gear and etc.) has more stable
junctions and produces a weak respond to mechanical impact. Active
device like clockwork produces a regular signal without any external
impact.
NOTE: its highly recommended to switch Detector over to 20K mode
when receiver signal level achieves 20 dB according to the 2-nd & 3-
rd harmonics scales because of this mode lower detection capacity.
