IEC 60384-22-2019 pdf free.Fixed capacitors for use in electronic equipment—Sectional specification – Fixed surface mount multilayer capacitors of ceramic dielectric, Class 2.
7.4.2 Qualification approval on the basis of the fixed sample size procedures
The fixed sample size procedure is described in lEC 60384-1:2016,-Q.5.3,b)Q.2.4.Thesample shall be representative of the range of capacitors for which approval is sought.Thismay or may not be the complete range covered by the detail specification.
For each temperature characteristic,the sample shall consist of specimens of capacitors ofmaximum and minimum size and for each of these sizes, the maximum capacitance value forthe highest rated voltage and minimum rated voltage of the voltage ranges for which approvalis sought. When there are more than four rated voltages,an intermediate voltage shall also betested. Thus, for the approval of a range,testing is required of either four or six values(capacitance/voltage combinations) for each temperature characteristic. Where the total rangeconsists of less fewer than four values, the number of specimens to be tested shall be thatrequired for four values.
In case assessment level EZ is used, spare specimens are permitted as follows:
Two (for six values) or three (for four values) per value may be used as replacements forspecimens that 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, thenumbers may be reduced accordingly.
When additional groups are introduced into the qualification approval test schedule,thenumber of specimens ‘required for Group 0 shall be increased by the same number as thatrequired for the additional groups.
Table 4 gives the number of samples to be tested in each group or subgroup together with thenumber of permissible non-conformances for the qualification approval test.
7.4.3 Tests
The complete series of tests specified in Table 4 and Table 5 are required for the approval ofcapacitors covered by one detail specification.The tests of each group shall be carried out inthe order given.
The whole sample shall be subjected to the tests of Group 0 and then divided for the othergroups.
Non-conforming specimens found during the tests of Group 0 (according to Table 4) shall notbe used for the other groups.
“One non-conforming item” is counted when a capacitor has not satisfied the whole or a partof the tests of a group.
The approval is granted when the number of non-conforming items do not exceed thespecified number of permissible non-conforming items for each group or subgroup and thetotal number of permissible non-conformances is zero.
NOTE Table 4 and Table 5 together form the fixed sample size test schedule.Table 4 includesthe details for the sampling and permissible non-conforming items for the different tests orgroups of tests. Table 5 together with the details of the test contained in Clause 8 gives acomplete summary of test conditions and performance requirements and indicates where, for example for the test method or conditions of test, a choice has to shall be made in the detailspecification.
The conditions of test and performance requirements for the fixed sample size test scheduleshould shall be identical to those prescribed in the detail specification for quality conformanceinspection.IEC 60384-22 pdf download.