UCM Calibration
Page 32
FlexPI Product Guide
3.
Review the Magnitude Response plot. Note the peak responses from the impacts.
4.
If required, adjust the Cable Gain Setting and repeat the tests (i.e., if both the light impacts and
the heavy impacts are registering high magnitude responses, lower the Gain one level; if both
the light impacts and the heavy impacts are registering low magnitude responses, raise the
Gain one level).
5.
Once the Gain Setting results in a consistent response with each heavy impact being recorded
as a Cut Count, and the light impacts registering with significantly lower magnitudes, the Gain
Setting is correct for the installation.
6.
Save the UCM file and download the new settings to the processor.
Setting the Cut Alarm parameters (impact attacks)
To properly set the FlexPI detection parameters, simulate a valid attack that is a close
approximation to the expected threat. Once the system always alarms in response to the
simulated attacks, monitor the system for nuisance alarms (see
).
Setting the Threshold
1.
Start recording a UCM Magnitude response plot tool, and perform the simulated attack
scenario along the protected surface.
2.
If any of the attack simulations (impacts) do not register as Cut Counts, lower the Cut Alarm
Threshold.
3.
Repeat this process until each simulated attack (impact) registers as a Cut Count and leads to
an alarm.
4.
Once the Threshold is set, monitor the system for nuisance alarms. If the nuisance alarm rate
(NAR) is unacceptable, try to determine and correct the source. Otherwise, raise the
Threshold and continue monitoring the NAR.
Note
The response should be similar for impacts of similar force (heavy
impacts = high magnitude, light impacts = low magnitude).
Note
Strike the protected surface close to and away from the cable, Use
the lower reading of the two results when setting the Threshold.
Note
If the Threshold is at or very close to the minimum value, and the
simulated attack is still not causing an alarm, raise the Cable Gain
setting one level, reset the Cut Alarm Threshold to 10, and repeat the
tests.
If the Threshold is at, or close to the maximum value, and the
nuisance alarm rate is unacceptable high, lower the Cable Gain
setting one level, reset the Cut Alarm Threshold to 10, and repeat the
tests.
If performing the above recommendations does not correct the
situation, redeploy the sensor cable using reduced cable spacing,
while ensuring that the cable is in close contact with the protected
surface. Repeat the entire calibration process after modifying the
sensor cable layout.
