FED-STD-791D
where:
CW = change in mg/cm2
W1 = original weight in mg.
W2 = final weight in mg.
W = width of metal strip in cm.
L = length of metal strip in cm.
8. REPORTING
8.1 Report change in weight in mg/sq cm rounded off to the nearest mg.
9. PRECISION
9.1 Repeatability. Results of each test obtained by one operator using the same
apparatus must not vary by more than that shown in Table 1.
9.2 Reproducibility. Results of each test obtained by different operators or
different apparatus must not vary by more than that shown in Table 1.
TABLE 1 - Precision.
Average weight change
Permissible variation
mg/cm2
Repeatability
Reproducibility
0.09 mg/cm2
0.046 mg/cm2
0 to 0.46
20%
10%
Above 0.46
Method prepared by:
Air Force - SFTL - 1986
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