RECALL
The Recall function allows the operator to view the data from the
last reading. Even though the ACU does not store multiple readings,
this function displays the latest data.
To access the Special functions, press 〈SPECIAL〉.
To access the Recall feature, press 〈START/ENTER〉.
The gauge displays the data from the last measurement. Scroll
through the screens using the up and down arrow keys.
OFFSET
For information on offsetting gauge readings, refer to page 3–2.
STAT TEST
The statistical stability test, or stat test, may be performed to
validate the normal operation of the gauge. Erratic readings or
readings that seem to fluctuate may indicate a problem with the
gauge. In the event the readings are suspect, a stat test may be
executed.
A stat test consists of 20 one-minute counts. After the 20 counts, the
gauge calculates the standard deviation. This standard deviation is
compared to a theoretical standard deviation value. Ideally this ratio
should be one. However, the ACU pre-scales (or divides) the counts
by 16, resulting in an ideal ratio of 0.25. The acceptable limits for
the ratio are from 0.17 to 0.33. The gauge is considered to be
unstable if the ratio is outside these limits.
4–2
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