Model 3411-B Advanced Control Unit 4–5
4. SPECIAL FUNCTIONS
DRIFT TEST
If the stat test has already been performed (and passed), but gauge
readings seem to drift between tests, the drift test can check the
long-term drift of the gauge.
A drift test consists of 5 four-minute counts taken approximately
three to eight hours after completion of a stat test with no movement
of the gauge between tests. Pass/fail limits are set using the percent
difference between the average of the stat and drift test results. If the
percent difference exceeds 0.5% for density or 1% for moisture, the
drift test fails.
NOTE
The gauge should not be turned off between the stat test
and drift test. The stat test must be current.
In addition, the gauge must not be moved between the
stat and drift tests to eliminate possible failure due to
positioning changes.
With the gauge still in the standard count position (on the reference
standard block), press 〈SPECIAL〉.
From the Special functions, select the Drift Test feature by pressing
the down arrow three times and 〈START/ENTER〉.
press START for
20 m. Drift Test
To begin the five counts, press 〈START/ENTER〉.
- DRIFT TEST -
Rdg.#:xx xxx sec
As with the stat test, the gauge indicates the count progress during
the drift test.
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