MIL-PRF-49464C
3.18.3 Substitution of capacitance tolerance and rated voltage. Parts qualified and marked to tighter capacitance
tolerance or higher rated voltage are, with acquiring agency approval, substitutable for parts marked to looser
capacitance tolerance or lower rated voltage, provided all other values, such as case size, characteristic, and leads
are the same. Unless specified in the contract or order (see 6.2), the substitutable parts shall not be remarked.
3.19 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.20 Workmanship. Capacitors shall be processed in such a manner as to be uniform in quality when using 7x
minimum to 30x maximum magnification. All capacitors shall not exhibit pits, cracks, rough edges, adhered foreign
material or other defects that will affect life or serviceability. The capacitors shall exhibit no demetalization (lift-off,
blisters, or roll back) or voids or scratches on the electrodes that expose the dielectric over more than 5 percent of the
area.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. Qualification inspection (see 4.4).
b. Verification of qualification (see 4.5).
c. Conformance inspection (see 4.6).
d. Periodic group B inspection (see 4.7).
4.2 QPL system. The manufacturer shall establish and maintain a QPL system in accordance with 3.3. Evidence
of such compliance is a prerequisite for qualification and retention of qualification.
4.3 Inspection conditions and methods.
4.3.1 Inspection conditions. Unless otherwise specified herein, all inspections shall be made in accordance with
the "GENERAL REQUIREMENTS" of MIL-STD-202 except relative humidity shall not exceed 75 percent. Accuracy
of all test voltage measurements shall be within ±2.0 percent of the specified voltage.
4.3.2 Reference measurements. When requirements are based on comparative measurements made before and
after conditioning, the reference measurement shall be considered the last measurement made at +25°C ±3°C prior
to conditioning. Unless reference measurements have been made within 30 days prior to the beginning of
conditioning, they shall be repeated.
4.3.3 Power supply. The power supply used for life testing shall have a regulation of ±2 percent or less of the
specified test voltage. The power supply used for insulation resistance measurements shall be stabilized to at least
±100 parts per million. Voltage fluctuations shall not occur during measurements that would produce a variation in
the current measurement.
4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the
Government (see 6.3), on sample units produced with equipment and procedures normally used in production.
Samples shall be selected in accordance with 4.6.1.1.1 and shall be representative of the highest capacitance value.
4.4.1 Sample size. The number of capacitors to be submitted for qualification inspection shall be as specified in
table V and in appendix A to this specification. Each separate capacitor class shall be qualified separately.
4.4.2 Test routine. Sample units shall be subjected to the qualification inspection as specified in table V, in the
order shown. All sample units shall be subjected to the inspections of group I. The sample shall then be divided as
specified in table V for groups II through VI inclusive, and subjected to the tests for their particular group.
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