Drift Test
If the stat test has passed but gauge readings seem to drift
between tests, a drift test can check the gauge’s long-term drift.
NOTE
The gauge should not be turned off between the stat
and drift test. That stat test must be current.
1. After performing the stat test, allow the gauge to sit for
three to four hours.
2. Place the gauge on the reference block in the standard count
position. Recording all counts, take five SLOW counts.
3. Average these five readings.
4. If the difference between this average and the average taken
in the stability test is greater than 1% for moisture, check
and replace the moisture module. If the gauge is still
drifting, check and replace the He
3
tube.
5. If the difference between this average and the average taken
in the stat test is greater than 0.5% for density, check and
replace the density module. If the gauge is still drifting,
check and replace the G-M tubes.
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