STAT TEST
Erratic readings, or readings that seem to fluctuate, may indicate a
problem with the gauge. If the readings are suspect, perform a stat
test, or statistical stability test, to validate the normal operation of
the gauge.
A stat test consists of twenty 1-minute counts. From the twenty
counts, the gauge calculates the standard deviation. This standard
deviation is compared to a theoretical standard deviation value.
Ideally, this ratio should be 0.25, with acceptable limits from 0.17 to
0.33. The gauge is considered unstable if the ratio is outside these
limits and the stat test will fail. If the stat test fails, ensure that the
gauge setup and testing was conducted correctly, and take an
additional test. If the second test fails, contact the nearest Troxler
service center for assistance. For a list of Troxler and authorized
Troxler service centers, refer to page iii of this manual or visit the
Troxler website at www.troxlerlabs.com/SERVICES/services.shtml
.
To access the Stat Test function, press 〈4〉 at the Setup menu. The
gauge displays the Stat Test menu:
To select a menu option, press the corresponding numeric key or
press
〈ESC〉 to return to the Setup menu.
TAKING A STAT TEST
Choose an area free of other nuclear gauges or radioactive sources.
Place the gauge on the reference standard block as shown in Figure
4–1 on page 4–3.
To take a new stat test, press 〈1〉 at the Stat Test menu shown
above. The gauge prompts the operator to place the gauge on the
reference standard block with the source rod in the SAFE (shielded)
position. Ensure that the gauge is properly positioned and press the
〈ENTER/START〉 key.
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