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

4.5.1.2.2 A3 tests.

4.5.1.2.2.1 Sampling plan. Two samples shall be selected randomly from each inspection lot and subjected to the A3 solderability test. If there are one or more defects, the lot shall be considered to have failed. Relays failing the A2 electrical tests, or rejected for other criteria which will not influence solderability, may be used for solderability testing. All rejected relays used as samples must accompany the acceptable relays through all processing environments.

The rejected relays shall be marked in a definite manner in order to preclude mixing with acceptable parts.

4.5.1.2.2.2 Rejected lots. In the event of one or more defects, the inspection lot is rejected. The manufacturer may use one of the following options to rework the lot:

a. Each production lot that was used to form the failed inspection lot shall be individually submitted to the solderability test as required in 4.6.4. Production lots that pass the solderability test are acceptable for shipment after successful completion of group A4. Production lots failing the solderability test may be reworked as described in 4.5.1.2.2.2b and 4.5.1.2.2.2c.

b. The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip process in accordance with 3.4.7.5. Two additional samples shall be selected and subjected to the solderability test with zero defects allowed. If the lot fails this solderability test, the lot shall be rejected and shall not be furnished against the requirements of this specification.

c. The manufacturer may submit the failed lot to a strip and replate process followed by a complete group A inspection. The reworked lot shall be considered a new lot for the purpose of the 5 percent requirement of A2. If the lot fails this solderability test, the lot shall be rejected and shall not be furnished against the requirements of this specification.

TABLE II. Group A inspection.

Inspection 1/

Requirement paragraph

Test method paragraph

Inspection requirements

Screening, internal moisture

Screening, run-in

3.5

4.6.2

4.6.3

Internal moisture;

run-in 2/

Dielectric withstanding voltage 3

Insulation resistance 3

Electrical characteristics 3

3.9

3.8

3.10

4.6.7

4.6.6

4.6.8

100 percent

Solderability

3.6

4.6.4

2 samples

Visual and mechanical inspection

(external) 4

Seal

3.1, 3.27, 3.28

3.7

4.6.1

4.6.5

100 percent

1/ Except as noted in 3/, tests shall be performed in the order shown.

2/ Thirteen relays shall be tested. If there are any failures, the entire lot shall be tested for internal moisture.

3/ Testing sequence is optional for insulation resistance, dielectric withstanding voltage, and coil resistance/maximum coil current only.

4/ Minor defects, such as marking, may be reworked. A two piece sample from each lot shall be mechanically

inspected.