MIL-DTL-83538 Connectors And Accessories, Electrical, Circular, Umbilical, Environment Resistant, Removable Crimp Contacts For Mil-Std-1760 Applications \(Metric\), General Specification ForThis specification covers connectors and accessories, electrical, circular, umbilical. The connector assembly provides the necessary connections required to meet MIL-STD-1760, class I electrical interface between stores and their associated launchers using a "blind mating" mechanism. The connector assembly consists of a receptacle installed on the launcher, a receptacle installed on the store, and a buffer plug installed between the two receptacles. This specification also includes the required mounting adapters and nut, accessory adapter, cable bushing, and protective covers \(see 6.1 for details on intended use and application\). The connectors covered by this specification are intended for use with launcher mechanisms with an applied holding force in the range 271 Newtons \(61 lbs\) to 427 Newton \(96 lbs\).

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MIL-DTL-83538D

Assembly and setup of figure 14 fixture shall be as follows:

The loading force should be applied using the following method:

1. Loosen the screws on the fixture slide to allow free movement.

2. Fit the clamp between the base of the fixture and the fixture slide using a suitable screw.

The thread of the screw should be of a fine pitch to enable accurate adjustment and should

match the thread in the base of the fixture slide.

3. Apply the load force to the spigots of the M83538/4 connector and clamp the loading

device such that the load is maintained. (It is recommended that a load cell or similar is

used to apply the load to the spigots. Devices relying on spring compression such as

spring balances shall not be used).

4. Tighten the screw between the clamp and fixture slide thus allowing the application of the

force to be transferred to the fixture arms until the force reading at the spigots reads no less

than 454 grams (1 lb).

5. Tighten the screws on the fixture slide to fix the position.

6. Remove the clamp and screw prior to vibration testing.

7. Steps 1 to 6 should be repeated prior to vibration in each axis.

4.6.17.1 Random vibration. Connectors shall be subjected to the test specified in method 514 of

MIL-STD-810 (see figure 9). The following details shall apply:

a. Procedure I: Using the vibration test spectrum of MIL-STD-810, with W0 functional = 0.20

G2/Hz, and W0 Endurance = 0.83 G2/Hz.

b. Vibration to be conducted at ambient temperature.

c. 0.04 G2/Hz to 31 Hz (89 Hz for functional test).

d. 4 dB/oct. increase to W0 at 300 Hz.

e. W0 from 300 Hz to 1000 Hz.

f. 6 dB/oct. decrease down to 2000 Hz.

g. The connectors shall be assembled utilizing a straight EMC backshell in accordance with

SAE-AS85049/19 or equivalent, attached to the launcher receptacle.

The duration shall be 30 minutes functional, 1 hour endurance, 30 minutes functional applied in each of

the 3 major axis.

4.6.17.2 Random vibration. Alternative procedure. Procedure 2: A lower endurance test level may be

used increasing the test time according to the following formula:

Wof / Woe =(Te / Tf )0.25

= time in high dynamic environment (300 h)

= endurance test time (hours)

= functional test level (g2/Hz)

Wof

= endurance test level (g2/Hz)

Woe

For example, if endurance test level is Woe=0.64 g2/Hz, then the test time should be set to

Te=2 hours and 52 minutes. The level and time periods for the functional vibration shall be as in

4.6.17.1. The vibration level of 0.64 g2/Hz is the lowest acceptable level to be applied.

This procedure applies to the following assemblies: