OHAUS TROOPER, Руководство по обслуживанию

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4-4
CHAPTER 4 TESTING
Figure 4-5. Sample Calculation of Standard Deviation ( ).
Reading Weight (kg) Weight - Mean (Weight – Mean) 2
1 3000.0 -.02 .0004
2 3000.0 -.02 .0004
3 3000.2 .18 .0324
4 3000.0 -.02 .0004
5 3000.2 .18 .0324
6 3000.0 -.02 .0004
7 2999.8 -.22 .0484
8 3000.0 -.02 .0004
9 3000.0 -.02 .0004
10 3000.0 -.02 .0004
SUM = 30,000.2 SUM = 0.116
Mean = SUM/10 Variance SUM/9=.0129
Mean =
=
= = = 3000.02 = Variance
=
= = = = 0.114
Figure 4-6. Off-Center Load Test Weight Locations.
σ
σ
σ
√
4.3.2 Off-Center Load Test
The Off-Center Load Test is used to determine whether displayed weight values will be affected by moving
the load to different areas of the weighing pan. See Figure 4-6.
MASS LOCATIONS
4.3.1 Repeatability Test (Cont.)