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
the maximum capacitance per unit surface area shall also be tested if this ratio
& N+ P1 o( K- X+ k# x5 a* w  Z' fexceeds that of the maximum capacitance value in the range by 10% or greater.
, E& T8 ^, q' RSimilarly, the capacitor with the minimum capacitance per unit area shall also be
! I1 e7 r/ C3 Wtested if this ratio is less than that of the minimum capacitance value in the range by
' A7 d* m3 Q% r+ E) r% N& Z10% or greater”. Nevertheless, the sampling plan is not well specified when the
0 k+ s2 o8 C& q9 C) i0 M. P1 {above case occurs. How should be composed the final sampling for tests?
/ s% d: v% e( e1 s+ Y3 aDecision: For the time being to apply the following proposed solution:
3 I7 g: a. m% o: ~; y) h- G+ f  |When the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4
of IEC 61049 shall contain as nearly as possible equal numbers of capacitors of the
+ V9 A) ^4 [  y, z& x8 Ehighest capacitance and of capacitors with capacitance per unit surface area
9 U; H7 S" G8 N% l# n" u; @9 Nexceeding 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
% ~4 u- |9 U) q- F# o. gcapacitors of the lowest capacitance and of capacitors with capacitance per unit
8 w" ~- v# q3 K/ `+ qsurface area less than that of the minimum capacitance value in the range by 10% or
greater.
Example – IEC 61048 - § 11 – self-healing capacitor.
7 @% v" I2 v5 M, G* ZA sampling of 50 capacitors is required and according to the above decision they
/ T4 ^0 F% w" z' Cshall be split as follows:
- 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
6 K# ]$ m% p% l& m$ Cmaximum value in the range by 10% or greater;
! h" B& r8 X5 x+ `1 K$ n5 x4 z- 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.
: M" S. t; H, j
+ F) x, ?( u, i* P4 l7 Y" s& H8 c9 S$ V

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