Tuning detectors

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Adjusting Detectors is an ongoing process. It is necessary to perform this direction when a particular detector starts producing too many false alarms. Adjustment is usually made possible by two central buttons: the residence time and the threshold value. The dwell time is a parameter shared by all the Detectors, and it indicates how long after entering the Pending Mode, the Detector will enter the Trigger Mode. A threshold value is a parameter that causes the Detector to respond to the data state at the start of an alert. In the Detector Setup screen, the parameters are arranged in order of importance. Thus in the directional process, one should always start from the parameter placed first. Next to the parameter name is a green/red arrow and a + or - sign. This arrow explains how an appropriate change (positive or negative) will cause an increase or decrease in the number of alerts.