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If a gauge performs all functions in the operating sections
normally, the final indication that the gauge is electronically
correct is passing the stability and drift tests. Passing these tests
means a gauge is suitable for field use, if properly calibrated.
The Quick Field Stability Check also provides a quick check of
the gauge’s performance.
Quick Field Stability Test
If gauge readings are suspect, perform a quick stability test.
1. Turn the gauge on and allow it to warm up for fifteen to
twenty minutes. (Ten minutes is adequate for normal field
use.)
2. Place the gauge on the reference block in the standard count
or SAFE position.
3. Recording each set of counts (DS and MS), take five four-
minute standard counts in succession.
4. Calculate the difference between the highest density
standard count and the lowest density standard count. The
density counts are stable if the percent difference between
the highest and lowest density standard count is less than
1%.
5. Calculate the percent difference between the highest
moisture standard count and the lowest moisture standard
count. The moisture counts are stable if the percent
difference between the highest and lowest moisture
standard count is less than 2%.
If the standard counts fail one or both of the above tests, return
the gauge to the lab to perform statistical stability (stat) and
drift tests.
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