MIL-DTL-26518C
3.6.13 Insulation resistance.
3.6.13.1 Insulation resistance. When connectors are tested as specified in 4.7.14.1, the insulation resistance shall be greater
than 5,000 megohms, when measured separately between pairs of contacts and between the shell and any contact. Shielded
contacts shall be measured between inner conductor and shield and between shield and closest adjacent shields to shell and shell.
3.6.13.2 Insulation resistance at high temperature. When tested in accordance with 4.7.14.2 and at an ambient temperature of
200°C +3°C, -0°C, the insulation resistance of connectors shall be greater than 2,000 megohms, when measured separately between
any two contacts and between the shell and any contact. Shielded contacts shall be measured between inner conductor and shield
and between shield and closest adjacent shields to shell and shell.
3.6.14 Salt spray (corrosion). After being tested in accordance with 4.7.15, the connectors shall show no exposure of basic
metal.
3.6.15 Temperature life. After subjection to the test of 4.7.16, the connectors shall perform satisfactorily and shall pass the
succeeding tests in the qualification test sequence.
3.6.16 Contact resistance. After subjection to tests specified in 4.7.17, and when tested as specified in MIL-C-39029, except with
a mating plug, the average contact resistance value of any 10 contacts of class H connectors shall not exceed those of table IV by
more than 700 percent. No individual contact shall exceed the specified value by more than 1100 percent.
TABLE IV. Contact resistance (Maximum potential drop in millivolts).
Contact
Wire
Test current
Potential drop
Potential drop
Potential drop
size
amperes
across Y-Y
across Y-Y
across Y-Y after
at 25°C
at 200°C
corrosion
20
24
3.0
12.0
25
23
20
22
5.0
13.5
26
23
20
20
7.5
15.0
26
23
16
20
7.5
12.0
26
23
16
18
15.0
20.0
36
38
16
16
20.0
21.0
36
38
12
12
35.0
22.0
36
38
12
14
25.0
21.0
33
35
12
16
20.0
20.0
32
35
3.6.17 Ozone exposure. At the end of the ozone exposure test of 4.7.18, the connectors shall evidence no cracking of materials
or other damage which will adversely affect subsequent performance in the qualification test sequence.
3.6.18 Insert retention. When tested in accordance with 4.7.19, completely assembled and unmated connectors shall withstand
an axial load of 45 psi (310.26 kPa) in either direction for a period of at least 5 seconds without being dislocated from their normal
position in the shell.
3.6.19 Air leakage.
3.6.19.1 Air leakage (class R). When tested in accordance with 4.7.20.1, class R receptacles shall prevent leakage of more than
1 cubic inch (16.39 cubic cm) of air per hour. Air leakage shall be measured at temperatures and pressures specified in 4.7.20.1.
3.6.19.2 Air leakage (class H connectors). When tested in accordance with 4.7.20.2, and when subjected to a pressure
differential of 30 psi (207 kPa) across the connector, class H connectors shall not exhibit an air leakage rate that will produce a
pressure change of more than 0.2 micron per cubic foot (0.028 cubic meter) per hour. The specified leakage rate shall apply through
the connector only and not through the flange and mounting surface sealing area.
3.6.20 Contact retention. When tested as specified in 4.7.21, the individual contact-locking mechanism on unmated connectors
shall withstand, in both directions, the axial loads specified in table V. During the test, the axial displacement of the contact shall not
exceed 0.012 inch (0.305 mm) when pressures are applied from the face side.
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