FED-STD-228A
Method 1153.1
18 April 2014
THICKNESS, SERVING; DIAMETER TAPE
1. SCOPE
1.1 This method is intended for use in determining the thickness of the outside serving of armored cable.
It is recommended for use when the wire or cable has an over-all diameter of one inch or more.
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 serving has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Diameter tape graduated to read to at least 0.01 inch.
3.1.2 Wiping cloth.
3.1.3 Alcohol or other suitable solvent.
4. PROCEDURE
4.1 The specimen shall be free from mechanical damage. The diameter tape shall be applied directly
over the serving of the specimen in such a manner that the serving is not distorted. The diameter over
the serving shall be read from the tape and the value recorded as D1.
4.2 The serving shall then be removed from the specimen and any saturants, fibers, of extraneous
materials removed from the surface of the core (assembly under the serving) by means of the cloth and
solvent. The diameter over the core shall be measured in the same manner as described for diameter
over the serving and the value recorded as D2.
4.3 The diameters over the serving and over the core shall be measured as nearly as practicable at the
same place.
5. RESULTS
5.1 Calculation. The thickness of the serving at any place shall be calculated as follows:
Thickness, inch=D1-D2
2
where:
D1=the diameter over the serving at the place measured, inches.
D2=the demand over the core at the place measured, inches.
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