MIL-DTL-26500G
4.6.13.1 Insulation resistance (group B). Connectors shall be tested in accordance with test procedure
EIA-364-21. For group B inspection the test potential may be applied through simulated contacts. The
resistance shall be measured separately between the closest three pairs of adjacent contacts and
between the contacts closest to the shell and the shell. Maintenance aging is not required for group B
inspection.
4.6.13.2 Insulation resistance (high temperature) (see 3.17.1). The insulation resistance of mated
connectors shall be measured in accordance with 4.6.13 except the connectors shall have been exposed
to an ambient temperature of 200°C +3°C -0°C for classes R, H, G, K, and E, and 175°C +3°C -0°C for
class F for 30 minutes; the resistance shall be measured while the connector is at the elevated
temperature.
4.6.14 Salt spray (corrosion) (see 3.18). Wired connectors shall be subjected to a salt spray test in
accordance with test procedure EIA-364-26. Following the test, connectors shall be examined for
corrosion. Class H specimens shall be tested in accordance with 4.6.22.
4.6.15 Magnetic permeability (except class H, see 3.19). Permeability shall be checked with an
instrument conforming to ASTM A342/A342M. The connectors may be wired or unwired, as convenient,
but shall not be carrying current.
4.6.16 Temperature life (see 3.20). The mated connectors shall be subjected to an ambient
temperature of 200°C +3°C -0°C for classes R, H, G, K, and E, and 175°C +3°C -0°C for class F, as
monitored adjacent to connector shells, for 1,000 hours. The wired contacts shall carry sufficient current,
not exceeding the rated current to maintain a contact temperature of 238°C +3°C -0°C for classes R, H,
G, K, and E, and 200°C +3°C -0°C for class F. The temperature shall be monitored on a contact closest
to the center of the connectors.
4.6.17 Insert retention (see 3.21). Unmated connectors shall be subjected to axial loads applied
separately to insert face and insert rear. The loading shall be increased gradually at an approximate rate
of 10 pound per second until the specified load is reached. The load shall be maintained for 5 seconds.
The load-applying device may be shaped as necessary to reduce the pressure at individual points.
4.6.17.1 Insert retention (class H) (see 3.21.1). Test specimens shall be mounted in a fixture which
simulates mounting in actual services. Such fixture shall accommodate an adapter suitable for
connection to a pressure source (air or hydraulic). Pressure shall be gradually applied at a rate such that
the specified pressure is uniformly arrived at in a time not to exceed 2 minutes. Pressure shall be
maintained for the specified time. Following the test, air leakage shall be performed as specified in
4.6.18.
4.6.18 Air leakage, class H (see 3.22). Receptacles shall be mounted in a test apparatus arranged to
permit application of 15 lbf /in2 pressure differential across the connector. Prior to test, at least 10 percent
with a minimum of three of the contacts shall have short wires soldered into normal service positions.
The leakage rate shall be determined while 15 lbf /in2 pressurized air or gas, containing not less than 10
percent helium by volume, is applied to the connector.
4.6.19 Contact retention (see 3.23). An axial load, as shown in table V, shall be applied to the
mating end of the contacts in unmated connectors. Testing shall be in accordance with test procedure
EIA-364-29. Contact movement shall be measured after contact is firmly seated on the retention
member. The connector shall have all the contacts in place during the test.
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