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signal noise level is with high pulse densities directly proportional to the square root
of the total ionization stream.
By determined use of this relation the current measurement in the picoampere
e can be done with extremely high precision. Simultaneously by this a
regularly appearing source of errors is eliminated, the drift of the preamplifier
offset, which results of the temperature sensitive FET-structure of the preamplifier.
Channel 3 stands for a ”classic” direct current measurement. Its use is bound to
the appearance of extremely high radon concentrations. Moreover, it is a
guarantee for a high fold back tightness of the measuring system.
On the basis of these three signal characteristics six
different analyzing algorithms
are processed. Finally, via an optimized density procedure the real radon
concentration is determined of them. By this any of the displayed radon values of
AlphaGUARD is the final result of ca. 50.000.000 arithmetic operations.
5 INSTRUMENT HOUSING
All measuring technical and electronic components of the AlphaGUARD are
housed in a sturdy aluminum body. The dimensions are:
- Housing: Length: 282 mm
Width: 340 mm
Height: 123
- Housing, including handle: Length: 329 mm
Width: 355 mm
Height: 123 mm
All functional and HMI elements are located on the front side of the
AlphaGUARD.
The sturdy handle is mounted on the left side panel.
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