Model 3400-B Series
6-5
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.
Summary of Contents for 3411-B
Page 3: ...Model 3400 B Series iii...
Page 10: ......
Page 15: ...Model 3400 B Series 1 3 Figure 1 Gauge and Accessories...
Page 20: ...2 4 Figure 2 3411 B Front Panel Controls...
Page 30: ...3 8 NOTES...
Page 44: ...5 8 Figure 4 Roller Pattern...
Page 76: ...Appendix A 16 NOTES...
Page 91: ...Model 3400 B Series Appendix C 3 Figure 15 Direct Transmission and Backscatter Geometries...
Page 92: ...Appendix C 4 Figure 16 Backscatter Surface Density Effects...
Page 104: ......
Page 108: ...Appendix E 4 NOTES...
