MIL-PRF-46374G
TABLE IV. Long term accuracy.
Average mean
Mean daily
Type
daily rate
rate
(Seconds per day)
(Seconds per day)
Type I, class 4
72
120
Types II and III, class 4
36
60
Types I, II and III,
2.4
4
classes 1, 2, and 3
3.5.14 Human perspiration resistance. Types II and III watches and their watch bands shall show
no evidence of corrosion, discoloration, or staining after having been subjected to an accelerated
lactic acid test in accordance with the human perspiration environment of table I.
3.6 Radiological performance. (NOTE: Section 3.6 is applicable only if nuclear material is
present.)
3.6.1 Contamination. Completed watches shall be tested for contamination after having been
subjected to all the environments of table I. They shall be wiped with a Metricel GN-6 or
equivalent wipe, moistened with deionized or distilled water. Within 1 minute of wiping, the wipe
shall be placed in a scintillation counter. Each resulting wipe shall indicate a removable
contamination level of not more than 100 disintegrations per minute (dpm).
3.6.2 Long term contamination (Qualification only). Completed watches shall be packaged in
accordance with 5.1 for a period of not less than 90 days. They shall then be wiped with a
Metricel GN-6 or equivalent wipe moistened with deionized or distilled water. Within 1 minute
of wiping, the wipe shall be placed in a scintillation counter and the disintegrations measured.
Each resulting wipe shall indicate a removable contamination level of not more than 100 dpm.
3.6.3 Diffusion. Completed watches shall be submerged in a measured volume of distilled or
deionized water, equal to approximately 10 times the volume of the watch, for 24 hours at
23 °C ± 1 °C (73 °F ± 3 °F). The watches shall then be removed from the water and the water
measured for radioactive content. The diffusion of contamination into the water shall not exceed
50 nanocuries per 24 hour period (see 3.5.5).
3.7 Workmanship. All parts shall be furnished so the case and crown shall have no sharp edges
or corners which could cause skin cuts or abrasions. All lugs from the tip of the lug to the body
of the bezel shall have corners rounded to avoid skin abrasion. Rounded edges and corners shall
be uniform in appearance.
3.8 Operating instructions. An operating instruction shall be furnished with each watch. This
instruction shall describe all the functions of the watch, the durability (i.e., shock and water
resistance features), life expectancy, and accuracy that can be expected from the watch, type
battery and any precautions that should be observed during the life of the watch.
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