MIL-PRF-27G
TABLE VIII. Groups A and B, zero defect-sampling plan.
Sample size
Lot size
Group A
Group B
Subgroup 2
Product level M
Product level M
1 to
5
100 percent
100 percent
6 to
13
100 percent
5
14 to
50
13
5
51 to
90
13
7
91 to
150
13
11
151 to
280
20
13
281 to
500
29
16
501 to
1,200
34
19
1,201 to 3,200
42
23
3,201 to 10,000
50
29
10,001 to 35,000
60
35
35,001 to 150,000
74
40
150,001 to 500,000
90
40
500,00 and over
102
40
4.6.1.5 Group B inspection (Product level M and T only). Group B inspection shall consist of the tests specified in
table IX, in the order shown and shall be made on sample units which have been subjected to and have passed the
group A tests unless it is more practical to select a separate sample from the lot for group B inspection.
TABLE IX. Group B inspection.
Test
Requirement
Method
paragraph
paragraph
Electrical characteristics: 1/ - - - - - -
Rated load 2/- - - - - - - - - - - - - - -
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Harmonic distortion- - - - - - - - - - -
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Frequency response - - - - - - - - - -
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Self-resonant frequency- - - - - - - -
---
Coupling among units (multi unit
transformers and inductors) - - - -
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Electrostatic shielding- - - - - - - - -
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Magnetic shielding - - - - - - - - - - -
---
Storage factor - - - - - - - - - - - - - -
---
Wave shape - - - - - - - - - - - - - - -
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Phase shift- - - - - - - - - - - - - - - - -
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Insertion loss - - - - - - - - - - - - - - -
---
Other electrical characteristics
(see 3.1) - - - - - - - - - - - - - - - - - -
---
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1/ As applicable (see 3.1). The actual circuit may be used for the electrical inspection tests in lieu of the test circuits
specified herein.
2/ The rated load test need not be performed if proof of prior compliance is available and other group A and B
electrical parameters are within the specified limits.
4.6.1.5.1 Product level M transformers/inductors. A sample of parts shall be randomly selected from inspection
lots that have passed group A inspection in accordance with table VIII. If one or more defects are found, the sample
has failed. Group B inspection shall be completed within 6 months of shipment. If the manufacturer can demonstrate
that the group B inspections have been performed five consecutive times with zero failures, these tests, with the
approval of the qualifying activity, can be deleted. The manufacturer, however, shall perform these tests every two
years after the deletion as part of the long-term design verification. If the design, material, construction, or processing
of the part is changed or, if there are any quality problems or failures, the qualifying activity may require resumption of
the original test frequency. Deletion of testing does not relieve the manufacturer from meeting the test requirement in
case of dispute.
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