MIL-PRF-49175C(CR)
TABLE IV. Group B Sampling Plan.
Monthly
Number of sample
Lot Size
units monthly
1-99
1
100-299
3
300-499
5
500-999
7
1000 or more
10
4.4.2.4.2 Group B failures. Actions required relative to group B
failures shall be as specified in the contract.
4.4.2.4.3 Disposition of group B samples. Group B samples shall be
accepted on contract subsequent to the tests of table III.
4.4.2.5 Group C inspection. Group C inspection shall be conducted on
coolers selected from units which have passed the tests in 4.4.2.2. Reliability
inspection shall be in accordance with 4.8 and Table V.
TABLE V.
Group C Inspection.
Inspection
Requirement
Test
Paragraph
Paragraph
Reliability
3.8
4.8
4.5
Test methods.
4.5.1 Cooling capacity. The cooling capacity shall be measured by
attaching to the cooler a test Dewar and coldstation. The heat load shall be
applied 30 minutes after achieving cooldown. Capacity shall be measured not
less than 20 minutes later. The tests of paragraphs 4.5.1, 4.5.2 and 4.5.3
shall be performed using test equipment consisting of the following items to
measure cooldown and refrigeration capacity:
1.
Test dewar
2.
Coldstation
3.
Appropriate power supplies and meters
4.
High vacuum source
a.
The test dewar shall be made of either brass or aluminum
with a highly polished surface finish of at least an 8
RMS. The test dewar in conjunction with the high vacuum
source shall enclose the coldfinger and coldstation in a
vacuum of 1x10-5 torr or lower.
7
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