欧盟276.03.osm.ctl

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IEC61347/UL935镇流器热试验箱

灯具防风罩

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家电125mm试验指

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无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

Question: In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for sampling plan are provided.
$ f+ ^0 c. ~. }  r( C* xBeside 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
) ?2 k% f; E$ 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
8 k  f2 |8 r& y; |; v6 P; W2 Y9 Y! ztested if this ratio is less than that of the minimum capacitance value in the range by
- x. f5 y4 x7 Q+ W10% or greater”. Nevertheless, the sampling plan is not well specified when the
above case occurs. How should be composed the final sampling for tests?
Decision: For the time being to apply the following proposed solution:
( ]4 B! n# Q! d! iWhen the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4
2 E. Q) t- w" _5 e* @7 |) a/ Kof IEC 61049 shall contain as nearly as possible equal numbers of capacitors of the
1 F! H& i. @/ x0 F) }3 ]+ y- zhighest 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
) I; W  z# z! n) P5 Q+ ?capacitors of the lowest capacitance and of capacitors with capacitance per unit
+ q9 q" V& d* o3 k0 F" m5 @surface area less than that of the minimum capacitance value in the range by 10% or
5 K) |' q# e3 I' d& E: @& rgreater.
Example – IEC 61048 - § 11 – self-healing capacitor.
  o* C; S9 [7 r# h: d5 TA sampling of 50 capacitors is required and according to the above decision they
shall be split as follows:
2 U  G1 x1 Q- O- 12 (13) capacitors of the highest capacitance in the range;
1 Z, `' F& G$ ^+ ]- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
+ Y. k6 i/ A$ h7 N5 Y2 P) Jmaximum value in the range by 10% or greater;
6 c# X# m1 U( z# u- 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
( U& a# c. u1 j4 {& i- zcapacitance value in the range by 10% or grater.

9 K" j& j5 @& n) L" H3 k

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