Recommended maintenance
FlexZone Product Guide
Page 89
Adjusting the Target Filters
Each cable side includes both a high pass and a low pass filter which can be used to screen out
some sources of nuisance alarms. Before adjusting the Target Filters, verify that the fence is not
loose and that there are no objects or vegetation that can contact the fence in strong winds. The
default value for the high pass filter is 10 Hz, the default value for the low pass filter is 40 Hz.
•
If you are encountering an unacceptably high NAR during moderate to strong winds, increase
the high pass filter slightly and continue monitoring for nuisance alarms. If you increase the
high pass filter, you should also increase the low pass filter by the same value to ensure that
there is adequate bandwidth for reliable detection.
•
If you have a very stable fence and would like to increase the detection sensitivity, you can
lower the high pass filter. If you do lower the high pass filter, monitor the fence to ensure that
the NAR has not increased.
•
If you are encountering detection problems (low sensitivity) rather than nuisance alarms, the
most likely source of the problem is the sensor cable. Sensor cable problems typically result
from improper conditioning, handling damage, or incorrect installation. Review the current
clutter level to see if there are any areas of the cable where the clutter signal is particularly
high. Repeat the profiling procedure and compare it to the original cable profile. Once you
have determined the location of the cable problems, correct the problems by reconditioning
the cable, or correcting any installation problems, or repairing the damaged section with a
cable splice.
Figure 90: Cable Side Configuration Target Filters
Note
If you adjust the Target Filters or make any cable repairs, always
reprofile and retest the sensor cable.
high pass filter
low pass filter
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