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Question: In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for sampling plan are provided.& z* W( x, Q7 ?4 X/ ~$ U
Beside the main rule, the following additional statement is given: “The capacitor with
$ T' W! _( G# W! Jthe maximum capacitance per unit surface area shall also be tested if this ratio
, e* I! G. S- L/ R: K- [exceeds that of the maximum capacitance value in the range by 10% or greater.- E" S$ u) ~, ]1 K8 h$ b
Similarly, the capacitor with the minimum capacitance per unit area shall also be
3 R4 ]; }3 j* {5 }5 N6 ?tested if this ratio is less than that of the minimum capacitance value in the range by
/ A% [ S2 @, J; N+ Z+ {10% or greater”. Nevertheless, the sampling plan is not well specified when the m# M8 o$ L% z8 P
above case occurs. How should be composed the final sampling for tests?/ Z" ?- z4 C% G% X. h3 W0 z
Decision: For the time being to apply the following proposed solution:
2 q d7 z0 p- CWhen the above case occurs, each group referred to in § 11 of IEC 61048 or in § 4
J( |! q5 N) f+ C* d9 v$ u, _$ P8 _: N- Uof IEC 61049 shall contain as nearly as possible equal numbers of capacitors of the; P/ p# [5 u' M* M- q6 ~ i
highest capacitance and of capacitors with capacitance per unit surface area
5 p. ?( ~ L" {exceeding that of the maximum capacitance value in the range by 10% or greater.9 M$ t' U4 f2 U; X
Similarly, each of those groups, shall contain as nearly as possible equal numbers of
: |4 \$ a* x% F: W( m. _. b7 wcapacitors of the lowest capacitance and of capacitors with capacitance per unit
4 x5 j; f3 B7 y; u, Ksurface area less than that of the minimum capacitance value in the range by 10% or
0 U- u9 w& E" ~1 a$ \# ^greater.- t% H/ @" V7 L3 e! Y: c
Example – IEC 61048 - § 11 – self-healing capacitor.
. M$ \0 T0 G/ S J$ {) L) fA sampling of 50 capacitors is required and according to the above decision they+ |5 u) J! X+ K3 d# A/ G$ C+ n
shall be split as follows:
2 f8 }( J; B% Y; |5 _- 12 (13) capacitors of the highest capacitance in the range;$ c+ p/ u2 g! ^! M* V! N
- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
g1 P, H$ F/ Y! _& R, Imaximum value in the range by 10% or greater;
# U9 M3 ]3 a" ^: t8 v% K- 12 (13) capacitors of the lowest capacitance in the range;. p) T9 b6 w# j% f' s
- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum! \2 g4 u6 P5 `% g8 _: |
capacitance value in the range by 10% or grater.8 D" j) N/ E: t8 n# p/ \1 ]3 A" F1 S
7 I: ]9 v1 ~7 _5 J) g
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