FED-STD-228A
where:
N=the number of ends of yarn in the specimen.
A=the angle between the yarn and axis of wire or cable.
L=the length of lay of the wrap or serving, inches.
D=the constant for yarn size (table I).
W=the equal to P Cos A.
P=the equal to L Tan A.
1.1
Unless otherwise specified in the
detail specification, one specimen from each inspection unit shall be tested.
5.3 The coverage of the wrap or serving of the inspection unit shall be the result obtained from the
specimen tested.
5.3.1 When more than one specimen is tested, the coverage of the wrap or serving of the inspection unit
shall be the average of the results obtained from the specimens tested.
5.4 The coverage of the wrap or serving of the inspection unit shall be recorded to the nearest 1.0
percent.
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