IEC 60384-20-2015 pdf free download.Fixed capacitors for use in electronic equipment – Part 20: Sectional specification – Fixed metallized polyphenylene sulfide film dielectric surface mount d.c. capacitors.
3.4 Qualification approval procedures
3.4.1 General
The procedures for qualification approval testing are given in lEG 60384-1 :2008. 0.5.
The schedule to be used for qualification approval testing on the basis of lot-by-lot and periodic tests is given in 3.5. The procedure using a fixed sample size schedule is given in 3.4.2 and 3.4.3.
3.4.2 Qualification approval on the basis of the fixed sample size procedure
The fixed sample size procedure is described in IEC 60384-1 :2008. Clause Q.5.3. list item b).
The sample shall be representative of the range of capacitors for which approval is sought.
The sample may be the whole or part of the range given in the detail specification.
The sample shall Consist of four specimens having the maximum and minimum rated voltages. and, for these voltages, the maximum and minimum capacitances. When there are more than four rated voltages an intermediate voltage shall also be tested. Thus, for the approval of a range, testing is required of either four or six values (capacitance/voltage combinations). When the range consists of less than four values, the number of specimens to be tested shall be that required for four values.
Two (for six values) or three (for four values) per value may be used as replacements for specimens which are non-conforming because of incidents not attributable to the manufacturer.
The numbers given in Group 0 assume that all groups are applicable. If this is not so the numbers may be reduced accordingly.
When additional groups are introduced into the qualification approval test schedule, the number of specimens required for Group 0 shall be increased by the same number as that required for the additional groups.
Table 4 gives the number of samples to be tested in each group or subgroup together with the permissible number of non-conforming items for qualification approval tests.
3.4.3 Tests
The complete series of tests specified in Table 4 and Table 5 are required for the approval of capacitors covered by one detail specification. The tests of each group shall be carried out in the order given.
The whole sample shall be subjected to the tests of Group 0 and then divided for the other groups.
Non-conforming specimens found during the tests of Group 0 shall not be used for the other groups.
Approval is granted when the number of non-conforming samples is zero.
Table 4 and Table 5 together form the fixed sample size test schedule for the qualification approval on the basis of the fixed sample size procedure.
Table 4 gives the number of the samples or permissible non-conforming items for each tests or test groups.IEC 60384-20 pdf download.