UCM Calibration
Page 30
FlexPI Product Guide
UCM detection parameters
Step 1 - Setting the filters
The Filter Settings are used to discriminate between vibrations (frequency response) caused by
environmental effects, and vibrations caused by an actual attack. The most important factor when
making the Filter Settings is the type of surface on which the sensor cable is mounted. For
example, if the sensor cable is installed on a rigid surface that has a dampening effect on
vibrations (e.g., wood, drywall, plasterboard, cement, brick, stone, masonry, etc.) the system may
UCM Parameter
Parameter description
Default
Cut Alarm Settings
Parameters used to detect an intrusion attempt using cutting, hacking, smash-
through, etc. (impact attack)
Window (sec) The time period in which the specified number of impacts (Count) must occur
to cause an alarm.
30
Threshold The received signal strength at which an impact is added to the Count total.
10
Count The number of impacts with signal magnitudes above the Threshold setting
that must occur within the specified Window to cause an alarm.
4
Cut Profile (%) A percentage of the Window setting that is added to the time remaining in the
Window each time an impact is added to the Count total.
20%
Climb Alarm
Settings
Parameters used to detect an intrusion involving a continuous action such as
drilling, boring, sawing, cutting, chiselling, climbing, etc. (sustained attack)
Window Sets the time period in which the specified Time of a sustained attack must
accumulate to cause an alarm.
30 sec.
Threshold The received signal strength at which sustained activity is added to the total
Time.
10
Time Sets the period of Time that the received signal must exceed the climb
Threshold to cause an alarm. The Time must be accumulated within the climb
alarm Window setting.
2 sec.
Filter Settings
The filter settings are used to customize the sensor’s frequency response to
the type of mounting surface and the installation environment. Correct
adjustment of the Filters increases the signal to noise ratio and helps to
screen out the ambient background noise.
There are two slider controls, which enable you to set the processor’s
frequency response band between 100 Hz and 900 Hz.
lower corner
300 Hz
upper corner
700 Hz
Gain Settings
Four settings that amplify/attenuate the received signal from the sensor cable
before processing.
Cable Sets the processor’s input signal Gain based on the type of mounting surface
and installation conditions (1 = low to 4 = high).
2
Misc Settings
A setting used to screen out ambient noise from environmental effects.
Ambient
Compensation
When Ambient Compensation is enabled, the processor evaluates the signals
from the sensor cable to obtain data on environmental activity (background
noise) that is typically gradual and of long duration. This ambient signal can
effectively be ignored and only the signals which are outside this ambient,
consistent region, are evaluated for Cut and Climb Alarm significance.
ON
Output
Configuration
Two settings used to set the minimum time that the relays remain active
following an event.
Hold/Active Time The length of time, in seconds, that the alarm relay will activate when an
intrusion alarm occurs (0.125 s to 10 s).
The minimum length of time that the supervision alarm relay will activate when
a supervision alarm occurs (0.125 s to 10 s).
2 sec.
2 sec.
