Ronan XSD-1000 - Manual (Page 43)

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Background Alarms
The default values for this menu should not be changed without consulting the factory.
The Detector Low Count Failure is the lowest number of counts you can receive from an
active detector. This value is typically 1.
The Consecutive Failures till Alarm ensures that you do not get false alarms in a very low
background radiation area.
The High Background Alarm Multiplier should always be 3. If the detector counts
suddenly peak above the background average by this amount (3 times background
average), then the detector will fault after the Consecutive Number of Faults. This alarm
is to ensure that radioactivity introduced to the detectors during Background mode does
not affect the sensitivity or calibration of the system.
The Consecutive Failures till Alarm behaves the same as above, except here it applies to
a High Background Alarm.