FED-STD-228A
4.2 Minimum thickness.
4.2.1 The inspection unit shall be examined for thin places in the insulation. The specimen shall be
taken from the inspection unit so as to include the point where the insulation is considered the thinnest
and shall be free from mechanical damage. Any saturants or extraneous materials shall be removed from
the insulation by means of the cloth and solvent.
4.2.2 The insulation shall be removed from the specimen on the side opposite the point considered
thinnest. A measurement including the thickness of the insulation at the point considered thinnest and
the diameter of the conductor or separator (if one is used) shall be made by applying the dial micrometer
in the manner described in 4.1.1 for determining the diameter over the insulation and the value recorded
as d1. The insulation at the point considered thinnest shall then be removed from the conductor and the
diameter over the conductor or separator (if one is used) measured as described in 4.1.2 and the value
recorded as d2.
4.2.3 The measurement over the insulation and the diameter over the conductor or separator shall be
determined as nearly as practicable at the same point.
4.2.4 If no thinnest point is located in the insulation of the inspection unit, the procedure shall be as
described in 4.1.
5. RESULTS
5.1 The results shall be described in method 1011.
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