Microwave barrier
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TESTING AND TUNING
To implement the desired operation of the detector, it must be set to operational status after
verification of the proper generation of alarm signals. It is therefore necessary to first perform test
penetrations of the detection zone along its entire length, especially at particularly vulnerable
points like depressions and elevations. In the event that no signal, an insufficient signal, a falsely
high signal or other faulty signal is generated when the detection zone is penetrated, it is
necessary to readjust the detection threshold level taking the measures described immediately
below.
ATTENTION!
To optimize the efficacy of the noise-proof feature of the detector, it is recommended
to establish the highest possible practical absolute value for the detection threshold level.
The final specification of the detection threshold level is done after first determining its
appropriate value by performing test penetrations of the detection zone. The mass of the mock
intruder performing the test penetrations should be 110-176 lbs. (50-80 kg), and the height of the
mock intruder, when bent, must be 2.62-3.28 ft. (0.8-1 m). It is compulsory to perform test
penetrations in the following places:
-
in the middle of the segment in both upright and bent positions;
-
at a distance of 49.21-65.62 ft. (15-20 m) from the transmitter unit and the receiver
unit in both upright and bent positions;
-
in a bent position in depressions.
When the mock intruder penetrates the detection zone, the resultant diminished signal should
then surpass the established detection threshold level, thereby triggering the generation of an
alarm signal.
Should the level of the received signal be insufficient (e.g., in cases where this is caused by the
actual length of a protected segment being close to the maximum range of the detector used), it is
recommended to increase the height(s) of the transmitter unit and/or receiver unit within a range
of 2.30-3.28 ft. (0.7-1 m), first in 0.33 ft. (0.1 m) increments, then in finer increments of in./cm.
It must be taken into account that, in certain cases, the maximum level of the received signal
during adjustment is achieved when the detector units have been inadvertently oriented in the
direction of a nearby reflective surface (e.g., metal fencing, water surface, etc.). In such cases it is
not advised to orient the detector units in such a direction.
One of the possible causes of erroneous responses of the detector (e.g., the generation of a false
alarm in the absence of an actual intrusion or, conversely, the generation of no alarm in the event
of an actual intrusion) may be the effect on the receiver unit of one segment of the emission of the
transmitter unit of a nearby segment. Such effect can be verified by temporarily switching off the
power supply of the nearby transmitter unit. To eliminate the effect, it is necessary to change the
operating frequency of the affected detector. The operating frequency change must be done
in
both the affected receiver unit and its transmitter unit
.
If the signal processing analysis suggests the possible presence of ‘noise’ in the received signal (e.g.,
by recording changes in signal strength not caused by an actual penetration of the detection zone),
it is necessary to identify and eliminate the source of such noise, if possible, or to modify the
