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Page Title:
Table VIII. Sample size for group A, subgroup 1 |
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|  MIL-C-18312F
TABLE VIII. Sample size for group A, subgroup 1.
Lot size
Sample size
1 - 125
100%
126 - Up
125
TABLE IX. Sample size for group A, subgroup 3.
Lot size
Sample size
1 - 90
3
91 - 500
13
501 - Up
20
4.6.2 Periodic group B inspection. Group B inspection shall consist of the examinations and tests specified in
table X in the order shown.
4.6.2.1 Sampling plan. Group B inspection shall be performed once every 2 months on samples from each
inspection lot (see 4.6.1.1). A sample, consisting of twelve specimens of voltage ratings representing a fair cross-
section of the lot and of the highest watt-second rating in each voltage category, shall be selected for each of
subgroups 1, 2, and 3 at random from each lot. Every 12 months, 12 sample capacitors that have completed the
group A life test, shall be subjected to the extended life test of subgroup 4, in accordance with 4.7.16.3. Shipments
of lots shall not be delayed pending results of the life test, except as specified in 4.6.2.3. Not more than one
defective capacitor will be allowed for a single sample (12 specimens).
TABLE X. Group B inspection.
Number of
Number of
defects
sample units to
Examination or test
Requirement
Method
permitted
be inspected
paragraph
paragraph
Subgroup 1
Vibration 1/
3.11
4.7.8
Salt spray (corrosion) 2/
3.12
4.7.9
12
1
Thermal shock and immersion 2/
3.13
4.7.10
Subgroup 2
Solderability (axial wire leads only)
3.14
4.7.11
Shock, specified pulse 1/
3.15
4.7.12
12
1
Moisture resistance 2/
3.16
4.7.13
Subgroup 3
Terminal strength 2/
3.17
4.7.14
Low temperature and capacitance change
12
1
with temperature
3.18
4.7.15
Subgroup 4
Life (extended)
3.19
4.7.16.3
12
1
1/ The time period for shock and vibration tests is a minimum of once every 24 months.
2/ If the manufacturer can demonstrate that this test has been performed five consecutive times with zero failure,
this test, with the approval of the qualifying activity, can be deleted. The manufacturer, however, shall perform
this test every 3 years after the deletion as part of long term design verification. If the design, material,
construction processing of the part is changed, or if there are any quality problems, the qualifying activity may
require resumption of the specified testing. Deletion of testing does not relieve the manufacturer from meeting
the test requirements in case of dispute.
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