FED-STD-228A
Method 1151.1
18 April 2014
THICKNESS, SERVING; MICROMETER CALIPER
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 a diameter of less than one inch.
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 Micrometer caliper graduated to read in mils or 0.0001 inch and having flat surfaces on both anvil
and end of spindle, each approximately 0.25 inch in diameter. The surfaces of anvil and spindle shall be
parallel to within 0.0001 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 micrometer caliper shall be applied
directly over the serving so that the specimen can just be moved between the anvil and the spindle
without distortion of the serving. The diameter over the serving shall be read from the micrometer caliper
scale and the value recorded as D1.
4.2 The serving shall be removed from the specimen and any fibers, saturants, or other extraneous
materials removed from the surface of the core (assembly under the serving) by means of the cloth and
solvent.
4.3 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. The diameters over the serving and over the core shall be
determined as nearly as practicable at the same point.
5. RESULTS
5.1 Calculation. The thickness of the serving at any point shall be calculated as follows:
Thickness, inch=D1-D2
2
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