False Alarms

Hi All, I need to evaluate performance of an alarming fence systems. False alarms are major issue. I was wondering if there's a *definition* for false alarm. Is it # of false alarms for somedistance in a given time? e.g. 5 false alarms per mile per day. Does that make sense? Does anyone have better suggestion? Thanks a lot in advance, Omer.

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Omer
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False Alarm is generaly an alarm that cannot be attributed to any know causes. Not to be compared or evaluated with nuisance alarms from known causes like shaking fences or loose fixtures..these are known cause and to not factor in for False alarm caluculations. Nuissance alarms = small animal, wind, environmentals and other alarms that can be attributed to to a visible or know cause!

Don't know the length of fence you are testing.. take a section of let say

100yards/meters over 30 days..use this as a multiplier for yearly and agregate lengths. If multiple line processors are used as calculations should remain within one (1) processsor/loop. Add all loop alarms to your aggregate count for system wide alarm rates.

If you are testing extra long length or fence sensors with multiple processors you may want to calculate the MTBF, Mean Time Between Failure. Most manufacturers of long distance sensor provide this info!, this will allow you to properly assess your spares requirement over the life cycle of your system and allow for volume purchase of spares at the initial roll out of your system purchase.

Pogo

Reply to
Pogo

Fals alarm comes from PIR or other sensitive detector. It does not mean the wireless or wire system is unuseless. What we can do it to improve this false alarm? By high technology to conquer false analysis,we distinguish pet from humanbeing. This generates Pet immune PIR motion detector. Follow to browse microsecu.com, you may learn more from it.thank you.

Reply to
microsecu68

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