TM 5-6635-386-12&PIt is most desirable that the operator maintain a standardcount diary with his raw data and his computationswritten down. This is most helpful to the repair shopshould the tester require repair for some complaint of"drift" or "erratic" counts. Use DA Form 5449-R(Moisture and Density Tester (Nuclear Method)Utilization Log) to record standard counts. DA Form5449-R is located at the back of this TM for localreproduction authority.Figure 1-3. Field Data WorksheetNote that both standard count series produced a normal split of 3 out of 7 inside the limits of + square root of the average.A split of 2 out/8 in or 4 out/6 in is normal occasionally, provided the usual split is a 3/7 and provided the average standardcount remains within approximately 1/3 square root of the prior series’ average.It is perfectly proper to use the Automatic Standard countfor daily routine, but it is very desirable that the fullevaluation be run periodically to ascertain that your testeris running properly, regardless of make or model.1-12. WHAT DO POOR RESULTS MEAN?If the tester consistently exhibits a tendency towards ahigh deviation, that is, the calculator method trends moretowards the 1.25 end of the spread than the 0.75 end,and the manual method trends more towards 4 and 5 outinstead of 2 out, the tester is indicating a tendencytowards erratic counts beyond the normal projecteddeviation to be expected.This erratic tendency is likely to come from a dirty highvoltage supply, dirty detector connectors, or a failingcomponent in the high voltage supply. Simply dusting offthe supply may eliminate the problems. If this does notwork the tester may require repair.1-11
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