FED-STD-228A
Method 8011.1
18 APRIL 2014
PICKS PER INCH, BRAID
1. SCOPE
1.1 This method is intended for use in determining the number of picks per inch in the braid of insulated
wire and cable. For the purpose of this method "picks per inch" is defined as the number of carriers
contained in 1 inch of the braid measured lengthwise of the finished wire or cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 4 inches in length with braid intact,
from which any covering over the braid has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 A thread counter, pick glass or other suitable instrument consisting of a low power ocular mounted
on a rack and pinion over a graduated scale. The position of the ocular with respect to the scale shall be
indicated by a pointer.
3.1.2 Wiping cloth.
3.1.3 Alcohol or other suitable solvent.
4. PROCEDURE
4.1 Any saturants or finishing material shall be removed from the surface of the specimen by means of
the cloth and solvent. The counting instrument shall be placed on the specimen so that the graduated
surface is parallel to the length of the specimen. The zero graduation on the scale and the pointer shall
be set on a braid intersection and the number of "carriers" over a length of 1 inch of the braid counted and
the value recorded. The value obtained is the number of picks per inch.
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 number of picks per inch of the braid of the inspection unit shall be the average of the results
obtained from the specimens tested.
5.3 The picks per inch of the braid of the inspection unit shall be recorded to the nearest 0.1 pick.
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