Figure 1-3. Field Data Worksheet

TM 5-6635-386-12&P It is most desirable that the operator maintain a standard count diary with his raw data and his computations written down. This is most helpful to the repair shop should 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 Form 5449-R is located at the back of this TM for local reproduction authority. Figure 1-3. Field Data Worksheet Note 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 standard count remains within approximately 1/3 square root of the prior series’ average. It is perfectly proper to use the Automatic Standard count for daily routine, but it is very desirable that the full evaluation be run periodically to ascertain that your tester is running properly, regardless of make or model. 1-12. WHAT DO POOR RESULTS MEAN? If the tester consistently exhibits a tendency towards a high deviation, that is, the calculator method trends more towards the 1.25 end of the spread than the 0.75 end, and the manual method trends more towards 4 and 5 out instead of 2 out, the tester is indicating a tendency towards erratic counts beyond the normal projected deviation to be expected. This erratic tendency is likely to come from a dirty high voltage supply, dirty detector connectors, or a failing component in the high voltage supply. Simply dusting off the supply may eliminate the problems. If this does not work the tester may require repair. 1-11