User's Manual

MIL-PRF-46374G
15
4.6.5.7 Case bars, types II and III. Type II and III case bars shall be checked for conformance to
3.4.5. With the watch held in a secured position and the strap held in a position that shall not
exert pressure on the buckle or the keeper of the strap, a pulling force of 67 ± 2 N (15 ± 1/2
pounds) shall be applied to each case/spring bar via the strap without the case/spring bar
permanently bending, loosening or causing damage to the case/spring bar or case assembly.
4.6.5.8 Case markings. All numbers and lettering shall be visually inspected for correctness,
legibility, and application in accordance with 3.4.8. Inspection for permanent marking shall
ensure that acceptable processes have been applied, such as: Casting, molding, steel stamp, acid,
etching, or engraving.
4.6.5.9 Vibration. The watch shall be vibrated in accordance with 3.5.1.
4.6.5.10 Shock. In compliance with 3.5.2, while running, the watch shall be dropped from a
height of 50 cm (19.7 inches), uncontrolled, onto vinyl tile 3 mm (one-eighth of an inch) thick
affixed to concrete block. At the conclusion of this test, the watch shall be running and be
subjected to a visual and tactile examination in compliance with 3.4.6 for any crystal damage or
loose, missing or damaged parts. After passing this examination, the watch shall be subjected to
the test in 4.6.5.11.
4.6.5.11 Storage. In compliance with 3.5.3, the watch shall be subjected to storage temperatures
for the times and in the order shown in table I. (Unless otherwise specified, the humidity is the
ambient humidity.) Temperature changes in the watch may be gradual to avoid thermal shock.
All watches shall have the battery in the watch. There shall be no evidence of physical defects,
damage on the watch, or imperfections of crystal. After passing this test, the watch shall be
subjected to and meet the requirements of 3.5.10. NOTE: The mechanical watches shall not be
run during storage tests.
4.6.5.12 Water resistance. The watch shall be examined to determine conformance with 3.5.4.
The watch shall be tested by immersing it completely for at least 5 minutes in distilled water
containing a wetting agent of approximately 1 percent by weight at room temperature and
atmospheric pressure of 1 atmosphere (14.7 pounds per square inch) for 5 minutes. For an
additional 5 minutes, the watch shall be immersed under a pressure of 3 atmospheres
(44.1 pounds per square inch). The watch interior shall then be inspected for moisture by placing
it on a heating element at 40.6 °C ± 1 °C (105 °F ± 2 °F) for 5 minutes, then placing several drops
of 21 °C ± 1 °C (70 °F ± 2 °F) water on the center of the crystal. Any visible condensed water
(fogging) on the inside of the crystal constitutes failure of this test.
4.6.5.13 Synchronization. The watch shall be examined to determine conformance with 3.5.6.
The setting mechanism shall be activated and readings taken when the minute hand is at 12 and
the hour hand is at the 3, 6, 9 and 12 hour respectively, to determine compliance with 3.5.6.
4.6.5.14 Magnetism. A magnetic field shall be generated electrically using standard test
equipment capable of developing the magnetic intensity (in Gauss) within the limits specified in
3.5.7. With the watch running, it shall be placed into the energized field in the manner specified in