MIL-PRF-23648F
TABLE IX. Group C inspection.
*
Inspection
Requirement
Method
Number of
paragraph
paragrap
sample units to
h
be tested
Monthly 1/
Dissipation constant
Thermal time constant
10
Terminal strength
Quarterly - Subgroup 1 1/
Resistance temperature characteristic
Thermal shock
10
Resistance to soldering heat
Moisture resistance
Quarterly - Subgroup 2
Load life
10
Quarterly - Subgroup 3 1/
High temperature exposure
10
Semiannually 2/
Vibration, high frequency
Shock, specified pulse
10
Immersion
*
1/ If the manufacturer can demonstrate that these tests have been performed for 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 three years after
the deletion as part of long term design verification. If the design, material, construction, or
processing of the part is changed, or if there are any problems, 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.
*
2/ If the manufacturer can demonstrate that these tests have been performed for 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 five years after
the deletion as part of long term design verification. If the design, material, construction, or
processing of the part is changed, or if there are any problems, 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.
4.7.2 Sampling plan.
4.7.2.1 Monthly. Ten sample units of any resistance value shall be inspected monthly with one
defective unit allowed. If more than one sample fails the monthly tests, double the quantity of samples
required shall be inspected with no defective units allowed.
4.7.2.2 Quarterly. Thirty sample units of any zero power resistance between the middle value and the
highest value for which qualification is sought shall be inspected quarterly. Ten sample units shall be
subjected to the tests of group 1, and ten sample units of the value closest to the value above the middle
value shall be subjected to the tests of subgroup 2. In addition, ten sample units shall be subjected to the
tests of subgroup 3. One defective unit will be allowed for each subgroup, but not more than one
defective for the three groups combined.
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