FED-STD-228A
Method 1411.1
18 April 2014
WIDTH, METAL TAPE ARMOR
1. SCOPE
1.1 This method is intended for use in determining the width of flat metal tape or interlocking armor of
insulated wire and cable.
2. SPECIMEN
2.1 The specimen should be the tape or armor removed from a piece of the inspection unit at least 3
inches in length.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Vernier caliper graduated to 1/40 inch or less with a vernier to read to 1 mil or 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. Any dirt, grease, saturants, or other
extraneous materials shall be removed from the specimen by means of the cloth and solvent. The
calipers shall be applied directly to the specimen so that the jaws of the calipers are just brought into
contact with the specimen in such a manner that the tape or armor is not distorted. The criterion of
contact is the initial development of frictional resistance to movement of the specimen between the caliper
jaws. The width of the tape or armor shall be read from the caliper scale and the value recorded. Five
measurements equally spaced along the length of the specimen shall be made.
4.2 Interlocking armor shall be removed from the finished wire or cable and flattened before the width
measurements are made.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, two specimens, one from each end of the
inspection unit, shall be tested.
5.2 The average width of the tape or armor of the inspection unit shall be the average of the results
obtained from the specimens tested.
5.3 The minimum width of the tape or armor of the inspection unit shall be the smallest of all values
averaged in determining the average width, 5.2.
5.4 The maximum width of the armor of the inspection unit shall be the largest of all values averaged in
determining the average width, 5.2.
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