MIL-PRF-28750F
TABLE II. Group A inspection.
Test
Inspection
Requirement
method
Sampling
paragraph
paragraph
procedure
Group A1
Screening
Group A2 1/ 2/
Insulation resistance
DWV
Electrical characteristics 3/
Group A3 4/ 5/
Seal
Visual and mechanical inspection
Group A4
Solderability 6/
1/ Testing sequence optional for insulation resistance and DWV.
2/ Transient voltage and exponential rate of voltage rise (dv/dt) shall be performed at
+25C ambient.
3/ Electrical characteristic testing shall not include the following: Electrical system spike,
overload, and power dissipation.
4/ Physical dimensions and weight shall be measured on two sample units per lot.
5/ Minor defects, such as marking, may be reworked.
6/ This solderability test can be eliminated if the manufacturer has demonstrated
process control under the SPC program (see 3.3.1), or other method that has been
approved by the qualifying activity. If the design, material, technology, or processing
of the part is changed or, if there are any quality problems, or failures, the qualifying
activity may require resumption of the specified testing. Deletion of testing does not
relieve the manufacturer from meeting the test requirement in case of dispute.
4.6.1.2.1 Sampling plan (group A1, group A2, and group A3). The tests performed in group A1, group A2, and
group A3 shall require 100 percent inspection, except only two units per production lot shall be tested for dc offset
voltage, waveform distortion, and minimum current ratings. Defective SSR's shall be removed from the production lot.
If, during the 100 percent inspection of group A2 over 5 percent of the SSR's are discarded, the production lot shall
be rejected. Unless otherwise specified, the 5 percent shall only be applicable to +25C tests. The rejected
production lot may be resubmitted for group A2 rescreening provided the SSR's meet the following criteria:
a.
The observed percentage defective allowed (PDA) does not exceed twice the specified PDA.
b.
The cause of failure has been evaluated and determined.
c.
The failure was due to random causes or, for pattern failures, appropriate and effective corrective action has
been completed to reject all SSR's affected by the failure cause.
15
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business