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Thus the actual alarm threshold adjusts itself automatically to
the existing background radiation level while taking a mini-
mum count rate to alarm into account. Please see also chapter
12.1 for more details about the relationship between Sigma
value and false alarms.
The actual setting of the alarm threshold 1 can be observed at
the bar graph threshold mark. At power on of the instrument,
the background ratemeter starts with its maximum value of
100cps, reaching its final value after 30 seconds. Using the
menu option
, the exact value of the alarm
Alarm Cnt. Rate
threshold currently valid at the respective background can be
displayed.
After acknowledgement of a sigma-alarm, the background
ratemeter is set to the actual count rate. Accordingly the alarm
threshold is increased and is fine adjusted during the next 15
seconds after acknowledgment. For this time the message
"Learning" together with a progress bar is displayed.
Alarm 2 is always referring to the total count rate without con-
sideration of any learned background.
3-10
DB-066 E
RadEye PRD-ER
Iw/Tr/Ff 06.07.2015
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