false alarm

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false alarm

[¦fȯls ə′lärm]
(electronics)
In radar, an indication of a detected target even though one does not exist, due to noise or interference levels exceeding the set threshold of detection.
References in periodicals archive ?
Such an approach was likely the result of nuisance alarms.
Under the old system, police dispatchers were spending so much time responding to false and nuisance alarms that it was detracting from their police dispatch duties.
In selecting a sensor technology or a specific product, a security manager should look at performance with regard to several criteria including the probability of detection (PD), the false alarm rate (FAR), the nuisance alarm rate (NAR), and vulnerability to defeat (VD).
This situation causes system fluctuations that lead to nuisance alarms.
A nuisance alarm is any sensor response to unintentional stimuli.
We are addressing a need which we have found in the industry for a low-cost solution that can also provide competent nuisance alarm rejection.
When properly installed, both sensors provide a high probability of detection, however, the nuisance alarm rate is higher than for the strain-sensitive cable sensor.
These detectors have wide application in the nuisance alarm prone environments found overseas.
Outdoor security is rife with causes of nuisance alarms.
Honeywell's Xtralis Vesda-E VEP offers improved detection performance - one and a half times greater sensitivity than Vesda VLP, up to six times better dust rejection to minimize nuisance alarms, saving building owners significant potential costs from fire department calls.
As operators realize the number and frequency of nuisance alarms, they begin to tune out all alarms.
Honeywell's Xtralis Vesda-E VEP offers improved detection performance -- one and a half times greater sensitivity than Vesda VLP, up to six times better dust rejection to minimize nuisance alarms, saving building owners significant potential costs from fire department calls.