FED-STD-228A
Method 1611.1
18 APRIL 2014
ANGLE, BRAID
1. SCOPE
1.1. This method is intended for use in determining the angle between the yarns of the braid and the axis
of the insulated wire or cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 6 inches in length from which any
covering over the braid has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as described in the methods referenced in 4.
4. PROCEDURE
4.1 The specimen shall be free from mechanical damage. Any fiber, saturants, or other extraneous
materials shall be removed from the surface of the specimen by means of the cloth and solvent. The
number of picks per inch shall be determined as described in method 8011 and the value recorded as P.
4.2 The number of carriers shall be determined as described in method 8021 and the value recorded as
C.
4.3 The thickness of the braid shall be determined as described in method 1111 and recorded as T.
4.4 The braid shall be removed from the specimen and the diameter over the core (assembly under the
braid) determined as described in method 1111 and the value recorded as D.
4.5 If two braids are present, the angle of the outer one shall be determined from the diameter over the
inner braid.
5. CALCULATION
5.1 The tangent of the angle of the braid at any place shall be calculated as follows:
Tangent of angle = 2šP(D+T)
C
where:
P=the number of picks per inch of the braid
D=the diameter over the core, inch
T=the thickness of braid, inch
C=the number of carriers in the braid
2š=6.28
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