MIL-R-5757-SUP-2 Relays, Electromagnetic, General Specification forThis specification covers the general performance requirements for electrical relays with contact ratings up to and including 10 amperes for use in electronic, communications, and other applications see 6.1.

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MIL-R-5757J

4.6  Methods of inspection.

4.6.1. Visual and mechanical.  Relays shall be examined to verify that the materials (see 3.3), interface and construction (see 3.4), physical dimensions (required only where mechanical inspection is specified), marking (see

3.27),  header glass (see 3.28), and workmanship (see 3.29) are in accordance with the applicable requirements. Inspection requirements apply only where indicated (see 3.28).

4.6.2  Internal moisture (when specified; see 3.1, 3.5).  Relays (coils de-energized) shall be held at 15°C to 25°C for a minimum of 30 minutes.  The insulation resistance of all contact pins, to case only, shall be observed and measured.  The relay coil shall be energized with 140 percent of rated voltage (or current) for a period of two and

one-half minutes.  The insulation resistance of all contact pins, to case only, shall be verified a minimum of once each

30 seconds during this period.  The lowest value shall meet the requirements of 3.5.

4.6.3  Run-in (when specified; see 3.1, 3.5).  Relays shall be subjected to 5,000 operations.

Maximum cycle rate           =                                               0.1         (cycles per second)                   Maximum operate time  +  Maximum release time

(seconds)                               (seconds)

The following conditions apply:

a.  Room ambient temperature (25°C).

b.  The coil shall be energized at rated voltage (or current) (see 3.1).

c.  Each pair of mated contacts shall be monitored for dynamic contact resistance. d.  The load conditions shall be at low level, unless otherwise specified.

4.6.4  Solderability (see 3.6).  Relays shall be tested in accordance with method 208 of MIL-STD-202.  The following detail and exception shall apply:  All terminations of each part shall be tested.

4.6.5  Seal (see 3.7).  Relays shall be tested in accordance with 4.6.5.1 or 4.6.5.2, as applicable.  In case of dispute, method 1014 of MIL-STD-883, test condition B shall govern.

4.6.5.1  Relays sealed with a tracer gas.  Relays sealed with a tracer gas shall be tested in accordance with method 112 of MIL-STD-202, or at the option of the manufacturer, method 1014 of MIL-STD-883.  The following details shall apply:

a.  Method 112 of MIL-STD-202:

(1)      Test condition C, procedure IV.  Relays shall be back-filled with a helium tracer gas (90 percent dry gas and 10 percent helium).  Silicone oil shall not be used.

(2)      Leakage rate sensitivity:  1 X 10-8  atm cm3/s or as specified (see 3.1). (3)      Measurements after test:  Not applicable.

b.  Method 1014 of MIL-STD-883, test condition B (gross leak test not required).

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