FED-STD-228A
4.3 The diameter of the small thread shall be measured with the microscope and the value recorded as
D.
4.4 Unless otherwise specified in the detail specification, two measurements equally spaced along the
length of the specimen shall be made.
5. RESULTS
5.1 Calculation
5.1.1 Circumference. The circumference of the wire, cable, or conductor, etc., at any place shall be
calculated as follows:
Circumference, inches = L - šD
N
where:
L=the length of the thread for N turns at the place measured
N=the number of turns of the thread
D=the diameter of the thread, inch
5.1.2 Diameter The diameter of the wire, cable, or conductor, etc., at any place shall be calculated
by dividing the circumference by 3.1416.
5.2 Unless otherwise specified in the detail specification, three specimens from each inspection unit
shall be tested.
5.3 The average circumference of the wire, cable, conductor, etc., of the inspection unit shall be the
average of the results obtained from the specimens tested.
5.4 The minimum circumference of the wire, cable, conductor, etc., of the inspection unit shall be the
smallest of all values averaged in determining the average circumference, 5.3.
5.5 The average and minimum circumference of the wire, cable, conductor, etc., of the inspection
unit shall be recorded to the nearest 0.002 inch.
5.6 The average diameter and minimum diameter of the wire, cable, conductor, etc., of the inspection
unit shall be recorded to the nearest 0.0001 inch.
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