MIL-DTL-55074G
concurrently with 4.7.15.1.
4.7.16 Temperature cycling (contact assembly and connector) (see 3.18). Connectors, mated and
prepared in accordance with 4.7.2.4, shall be subjected to the following temperature cycle consisting
of 5 steps. The rate of temperature change between steps shall be as rapid as possible and is to be
accomplished by moving the connectors within 5 minutes from one environmental chamber, which is at
the temperature and humidity conditions of any given step to another environmental chamber, which is
at the temperature and humidity conditions of the next step. Measurements shall be taken on steps 1,
3, and 5 and shall meet the requirements of 3.18. When measurements are taken on steps 1, 3, and
5, practical thermal equilibrium shall first be attained. Practical thermal equilibrium is attained when
the temperature of any selected surface of the equipment changes less than I°F during a 1/2 hour
period while the ambient temperature is steady at specified temperature.
Step 1: Temperature 77°F ±3°F, relative humidity less than 75%; minimum exposure is the time
necessary to reach practical thermal equilibrium. Measurements shall be taken.
Step 2: Temperature 163°F ±3°F, humidity is uncontrolled; minimum exposure is 24 hours or to
practical thermal equilibrium, whichever occurs first. No measurements shall be taken.
Step 3: Same as step 1. Measurements shall be taken.
Step 4: Temperature -83°F ±3°F, humidity is uncontrolled; minimum exposure is 24 hours or to
practical thermal equilibrium, whichever occurs first. No measurements shall be taken.
Step 5: Same as step 1. Measurements shall be taken.
4.7.17 Mating at high and low temperature extremes (connector) (see 3.20). Sample connectors, 1/2
mated and 1/2 unmated, shall be placed in a temperature chamber and conditioned at -65°F ±2° for 24
hours. Within 5 minutes of being removed from the chamber the connectors shall be mated and unmated
to determine compliance with 3.20. The above shall be repeated at +150°F ±2°.
4.7.18 Moisture resistance test (connector) (see 3.21). Connectors prepared in accordance with
4.7.2.4, mated, unmated with protective cover in place, and unmated without protective cover, shall be
tested in accordance with method 507, procedure III of MIL-STD-810 for 30 continuous 24-hour cycles.
Insulation resistance measurements shall be made at the required test steps. For step 7, insulation
resistance measurements shall be made near the end of every fifth cycle while still at 30°C (86°F) and
95% relative humidity. The equipment shall meet the requirements of 3.21.
4.7.19 High humidity and high temperature (connector) (see 3.22). Connectors prepared in accordance
with 4.7.2.4, mated, unmated with protective cover in place and unmated without protective cover shall be
placed in a chamber at 86°F ±5° and a relative humidity of 92 to 98 percent. The temperature and
humidity shall be maintained continuously for 5 days. While still at these conditions, the insulation -
resistance shall be measured on the last day and the equipment shall meet the requirements of 3.22.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract
or order (see 6.2). When actual packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military service's system commands.
Packaging data retrieval is available from the managing Military Department's or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
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