FED-STD-228A
Method 1223.1
18 April 2014
THICKNESS, WOVEN OR BRAIDED METAL ARMOR;
DIAMETER TAPE
1. SCOPE
1.1 This method is intended for use in determining the thickness of woven or braided metal armor. It is
recommended for use when the wire or cable has an over-all diameter of 1 inch or more.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 2 feet in length.
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. Any dirt, grease, or other extraneous
materials shall be removed from the specimen by means of the cloth and solvent. The diameter tape
shall be applied directly over the armor in such a manner that the armor is not distorted. The diameter
over the armor shall be read from the tape and the value recorded as D1.
4.2 The armor shall be removed from the specimen and the diameter over the core (assembly under the
armor) determined in the same manner as described for over the armor and the value recorded as D2.
4.3 Three measurements equally spaced along the length of the specimen shall be made. The
diameters over the armor and over the core shall be determined as nearly as practicable at the same
point.
5. RESULTS
5.1 Calculation. The thickness of the armor at any place shall be calculated as follows:
Thickness, inch = D1-D2
2
Where:
D1=the diameter over the armor at the place measured, inches.
D2=the diameter over the core at the place measured, inches.
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