FP400 alarm detection
FP400 Product Guide
Page 59
Detection parameters
UCM Parameter
Parameter description
Default/Range
Zone Enable
Select (check) the Zone Enable checkbox to make the corresponding Zone
operational.
Deselect the Zone Enable checkbox only for an unused Zone (i.e., no fiber
optic cable connected).
unchecked
(zone OFF)
RX Cable Gain
Amplifier setting that boosts the detection signal received from the sensor
cable.
Use the RX gain to optimize the amplitude of the detection signal.
1 / 1 - 3
Extended Lead In
When checked, the Extended Lead In checkbox enables a fixed gain
pre-amplifier to compensate for attenuation due to a long run of lead-in cable.
Use in conjunction with the RX Gain setting to optimize the detection signal
amplitude.
Select (check) the Extended Lead In checkbox if there is more than 5 km
(3.1 mi.) of lead-in cable to a zone’s start module.
unchecked
(lead-in cable
length less
than 5 km)
Detection Settings Detection parameters used to detect an intrusion attempt.
Low Frequency
Filter Settings
Sets the low frequency cut-off of the target detection filter. Signals below this
frequency are ignored.
20 kHz
1 kHz-40 kHz
High Frequency
Filter Settings
Sets the high frequency cut-off of the target detection filter. Signals above this
frequency are ignored.
30 kHz
1 kHz-40 kHz
Event Threshold The Event Threshold is the signal level at which a cable stimulus is
considered to be a fence disturbance event.
Each time the Event Threshold is crossed, the Event Count is incremented
and the Event Duration accumulates the time that the signal remains above
the Threshold.
Using a lower Event Threshold setting typically increases the probability of
detection (Pd). However, a lower Event Threshold may also increase the
nuisance alarm rate (NAR).
A higher Event Threshold typically decreases the Pd and may also reduce
the NAR.
25 / 1 - 255
Alarm Window
(Sec)
Sets the time period following an event in which the Event Count setting or
the Event Duration must be reached to cause an alarm. If neither parameter
is met within the Alarm Window time setting the three parameters are cleared
and reset to 0.
30 / 10 - 120
(Seconds)
Event Count Sets the number of events that must occur within the Alarm Window to trigger
an alarm.
Counts the disturbance events that have signal magnitudes above the Event
Threshold.
4 / 1 - 32
Event Duration An advanced parameter that sets the cumulative time period that the signal
remains above the Event Threshold within the specified Alarm Window time
to trigger an alarm.
3 / 1 - 30
(Seconds)
Event Profile (%) An advanced parameter that specifies a percentage of the Alarm Window
time setting that is added to the time remaining in the Alarm Window each
time the Event Count is incremented.
20% / 10 - 100
Event Mask (Sec) An advanced parameter that specifies the time period following an Event that
must lapse before the next Event can be recorded.
Used to prevent reverberations caused by a single event from being recorded
as subsequent events.
0.3 / 0.1 - 20