MIL-DTL-25516F
4.7.19 Ozone expose. Connectors shall be tested for ozone exposure in accordance with test
procedure 014 of EIA 364. Rubber portions of the connectors shall be subjected to ozone exposure
having a concentration of 0.010 to 0.015 percent by volume for 2 hours at room temperature. After
testing, the connectors shall be visually checked for evidence of cracking or other damage that will affect
performance adversely (see 3.6.18).
4.7.20 Corrosion resistance. Mated and wired connectors and contacts shall be subjected to 5 percent
salt spray in accordance with test procedure 026 of EIA 364, condition B. Mated connectors shall pass the
insulation resistance test (4.7.2) and outer contact resistance test (4.7.4). It shall be possible to mate and
unmate the connectors as in service and there shall be no corrosion (3.6.19).
4.7.21 Sulphide immersion. Mated and cabled connectors shall be immersed for 1 minute in the
following solution, prepared as specified, after which they shall be double rinsed in tap water, rinsed in
alcohol, air dried, and examined for tarnish:
Dissolve 1 pound of sodium sulphite in 800 cm3 of distilled water.
a.
Dilute to 1000 cm3.
b.
c.
Add 250 grains of powdered sulphur.
d.
Allow solution to stand 16 hours.
e.
Dilute with distilled water to a specific gravity of 1.14. This solution shall be replaced once each
week.
4.7.22 Maintenance aging. The connectors shall be mated and unmated 10 times to provide
accelerated maintenance aging of the contact, contact locking mechanism, and sealing provisions (see
3.6.21).
4.7.23 Shield clamp resistance (except classes H and Y) (see 3.6.22). The shield clamp (cable braid to
connector) resistance measurement shall be conducted with the apparatus shown on figure 5 and under
the steps indicated below:
a. Accurately determine the resistance per inch of several feet of the coaxial cable shield (braid to
conductor) and record this value as Rb/inch.
b. Assemble 5-inch lengths of cable to the test sample connectors and accurately determine the
shield effective length in inches from where the shield enters the braid clamp to where it enters
the power supply connection, as shown on figure 6 and record this value as Eb.
c. Then the effective cable shield (braid) resistance shall be (Rb/inch) (Eb) = Rb. (Eb is the effective
braid length) (Rb is the effective braid resistance).
d. Determine the total shield circuit resistance from the body of the connector to the power supply
cable braid connection and record as RT.
e. Then the resistance of the shield clamp connection will be RT Rb = Rc. Rc is the shield clamp
resistance in milliohms.
NOTE: The millivolt values can be used as milliohm values, if the current has been kept to one ampere
as required.
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