欧盟276.03.osm.ctl

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IEC60335试验指甲

Question: In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for sampling plan are provided.
Beside the main rule, the following additional statement is given: “The capacitor with
0 y! v; i# X; F2 c- W) }0 _the maximum capacitance per unit surface area shall also be tested if this ratio
3 P! L4 B- j7 w* f. d- ?( u8 Gexceeds that of the maximum capacitance value in the range by 10% or greater.
Similarly, the capacitor with the minimum capacitance per unit area shall also be
tested if this ratio is less than that of the minimum capacitance value in the range by
. a) Q' S9 T0 B" L6 g10% or greater”. Nevertheless, the sampling plan is not well specified when the
( S! F: P; U0 \0 S6 X  B: i0 qabove case occurs. How should be composed the final sampling for tests?
7 N. L. v  Q& @Decision: For the time being to apply the following proposed solution:
" @- m% n4 |9 i- T% E3 B1 {When the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4
7 N: {: L0 C2 b8 N" Qof IEC 61049 shall contain as nearly as possible equal numbers of capacitors of the
highest capacitance and of capacitors with capacitance per unit surface area
exceeding that of the maximum capacitance value in the range by 10% or greater.
Similarly, each of those groups, shall contain as nearly as possible equal numbers of
capacitors of the lowest capacitance and of capacitors with capacitance per unit
" w. i% v, C8 k' g( b) I  n: n" ksurface area less than that of the minimum capacitance value in the range by 10% or
greater.
  C' `- B% O" W" Q8 w4 v! rExample – IEC 61048 - § 11 – self-healing capacitor.
" P- Q- w0 e# ?; d9 _A sampling of 50 capacitors is required and according to the above decision they
% g+ Y8 u0 _- `# Tshall be split as follows:
+ a1 P- c6 a4 z1 t5 n$ `- 12 (13) capacitors of the highest capacitance in the range;
- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
1 x9 `: C7 c6 e# Z/ Z4 jmaximum value in the range by 10% or greater;
- 12 (13) capacitors of the lowest capacitance in the range;
- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum
capacitance value in the range by 10% or grater.

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