
FP400 initial calibration
FP400 Product Guide
Page 65
Setting the cable supervision parameters
The FP400 processor supervises the sensor cables (lead-in and detecting) independently for each
zone. There are two settings that are used to fine tune cable supervision: Supervision Duration
and Supervision Threshold. The Supervision Duration sets the period of time the processor uses
to declare a supervision alarm. The Supervision Threshold subtracts the minimum signal from the
maximum signal to determine if there is a supervision event in progress. When the difference
between min. and max. is below the Supervision Threshold setting, 100 ms of supervision time is
accumulated. When the difference between min. and max. is above the Supervision Threshold
setting, the accumulated supervision time is reduced by 100 ms. If the accumulated supervision
time reaches the Supervision Duration setting, a supervision alarm is declared in that zone.
Setting the Supervision Duration
Use the Supervision Duration to set the period of time that must accumulate before a supervision
alarm is recorded in the selected zone (default value = 5 seconds, range from 0 to 240 seconds).
Setting the Supervision Threshold
The Supervision Threshold sets the signal level that determines whether a supervision event is in
progress. The processor subtracts the minimum signal level from the maximum signal level
recorded during a 100 ms period to determine the value of the supervision signal. When the value
of the supervision signal is below the Supervision Threshold, 100 ms of supervision time is
accumulated. When the value of the supervision signal is above the Supervision Threshold, the
accumulated supervision time is reduced by 100 ms (default value = 50, range from 0 to 4095).
Mitigating weather related nuisance alarms
If your FP400 system is having a problem with nuisance alarms during inclement weather, inspect
the fence to ensure it is in good condition and there are no loose fittings or other objects that can
cause metal on metal contact or bang against the fence. Check to make sure that no vegetation is
growing against or through the fence and that there are no overhanging tree branches that can
contact the fence or the barbed wire/razor ribbon topping. Next, connect the UCM to the processor
and review the alarm history. Adjust the detection parameters to try to exclude the signals that are
causing the nuisance alarms. Continue with this process until the nuisance alarm rate reaches an
acceptable level. Retest the detection response after adjusting the detection parameters.
Note
Senstar recommends using the default supervision settings. Adjust the
supervision settings only if you encounter an unacceptable nuisance
alarm rate (NAR).
To increase the processor’s sensitivity to supervision events lower the
Supervision Duration and/or raise the Supervision Threshold.
To decrease the processor’s sensitivity to supervision events raise the
Supervision Duration and/or lower the Supervision Threshold.