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11 PARTICULAR INFORMATION FOR USE
- AlphaGUARD disposes of an internal real time clock. When there are
simultaneous measurements with several instruments the clocks have to be
synchronized in advance.
- Each time when switching on AlphaGUARD a new measurement series is
generated automatically, and after receiving the first value established in the
working memory. Here, all following measuring values are filed as far as the user
has not enforced a further measuring series by memory reset, change of the
system clock,
change of the operation mode or switching the monitor off and
on.
- The working memory of the AlphaGUARD has a capacity of up to 60 000 data
points. If the memory is full, then automatically the eldest data point is
overwritten respectively (ring storage). This means that with permanent
operation of the AlphaGUARD, data of the last 60 000 measuring cycles are
always available in the memory.
- The numbers of experiments are placed by the AlphaGUARD autonomously in
ascending order. Up to a maximum of 512 measuring series can be
administrated in the memory of AlphaGUARD. This means that initiating further
measuring series leads to overwriting of the eldest measuring series.
- Operating the AlphaGUARD for longer times mains-independently (> 10 days),
the instrument switches off automatically. In this case the remain
of the internal rechargeable battery has fallen below a certain limit to operate
correctly. This security switch off secures the battery against a total discharging
and prevents the complete system from malfunction.
- The automatic background correction can lead to negative radon values
especially when measuring with short cycles (1 or 10 min) close to the lower
detection limit.
Only when the system clocks run parallel a correct correlation of measuring values
is possible.
In order to avoid loss of data the memory should regularly be read out
under consideration of the selected measuring cycle.
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