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|  MIL-C-18312F
4.6.2.2 Disposition of sample units. Sample units that have been subjected to group B inspection shall not be
delivered on the contract or purchase order.
4.6.2.3 Noncompliance. If a sample fails to pass group B inspection, the supplier shall take corrective action on
the materials or processes, or both, as warranted, and on all units of product that can be corrected and that were
manufactured under essentially the same conditions, with essentially the same materials, processes, and so forth,
and that are considered subject to the same failure. Acceptance of the product shall be discontinued until corrective
action, acceptable to the qualifying activity, has been taken. After the corrective action has been taken,
group B inspection shall be repeated on additional sample units (all inspections or the inspection which the original
sample failed, at the option of the qualifying activity). Group A inspection may be reinstituted; however, final
acceptance shall be withheld until the group B reinspeciton has shown that the corrective action was successful. In
the event of failure after reinspection, information concerning the failure and the corrective action taken shall be
furnished to the cognizant inspection activity and the qualifying activity.
4.7 Methods of examination and test.
4.7.1 Visual and mechanical examination. Capacitors shall be examined to verify that the materials, design,
construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements
(see 3.1, 3.3, 3.4, 3.21 and 3.23).
4.7.2 Seal (see 3.5). Capacitors shall be tested in accordance with method 112 of MIL-STD-202, condition A. For
liquid-filled capacitors, the following test may be substituted: Capacitors shall be placed with the terminals facing
sideways (not upward) on a clean sheet of absorbent paper and exposed to a case temperature within +3C, -0C of
the applicable high test temperature (see 3.1) for a minimum of 1 hour. Capacitors shall then be visually examined
for evidence of leakage of impregnant, filling compound, or bubbles from the seal.
4.7.3 Dielectric withstanding voltage (see 3.6). Capacitors shall be tested in accordance with method 301 of MIL-
STD-202. The following details and exceptions shall apply:
a. Magnitude and nature of test voltage: As specified (see 3.1).
b. Duration of application of test voltage: At least 98 percent of applied potential for 1 minute.
c. Points of application of test voltage: As specified (see 3.1).
d. Power supply voltage regulation: 2 percent or better.
e. Current resistance: Sufficient to limit charging current to 1.0 ampere maximum.
f. Examination after test: Capacitors shall be visually examined for evidence of damage, arcing, or
breakdown.
4.7.4 Capacitance (see 3.7). Capacitance shall be measured by method 305 of MIL-STD-202 with an accuracy
within 2 percent, when referred to measurements made on a standard bridge at 60 or 1,000 Hz, as applicable, at a
temperature of 25C 3C (77F 5F). Capacitors having a nominal capacitance greater than 1 F or less shall be
measured at a frequency of 1,000 100 Hz. The tolerance used for capacitance tests conducted at the contractor's
plant shall be equal to the absolute tolerance, less the accuracy of the instrument used. The tolerance used for
capacitance tests conducted at a Government laboratory shall be equal to the tolerance measured (absolute
tolerance) plus the accuracy of the test equipment used.
4.7.5 Dissipation factor (see 3.8). The dissipation factor shall be measured at a temperature of 25C 3C at an
ac voltage (rms) not greater than 20 percent of the rated dc voltage of the capacitor. Capacitors having a nominal
capacitance of greater than 1 F, shall be measured at a frequency of 60 5 Hz. Capacitors having a nominal
capacitance of 1 F or less shall be measured at a frequency of 1,000 100 Hz.
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