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
8 U3 e1 j, O7 n) z% N0 \' @6 xthe maximum capacitance per unit surface area shall also be tested if this ratio
+ i" J+ K" \* R( T4 P- J* Rexceeds 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
& V. R5 O" O% u/ o) I, Z10% 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:
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
highest capacitance and of capacitors with capacitance per unit surface area
  k" N  s2 y6 t5 C) eexceeding that of the maximum capacitance value in the range by 10% or greater.
& l! ]; Z5 w, F9 ?Similarly, each of those groups, shall contain as nearly as possible equal numbers of
7 Q( k& x# F4 r2 W. U$ T7 jcapacitors of the lowest capacitance and of capacitors with capacitance per unit
; B! }* R/ p/ u5 jsurface area less than that of the minimum capacitance value in the range by 10% or
greater.
Example – IEC 61048 - § 11 – self-healing capacitor.
A sampling of 50 capacitors is required and according to the above decision they
shall 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
' O  c# U& ~  p1 h5 Ymaximum value in the range by 10% or greater;
- 12 (13) capacitors of the lowest capacitance in the range;
4 E8 i5 |$ j4 e1 s$ v) }- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum
: }0 M1 `7 r, ?$ u1 a5 i6 ccapacitance value in the range by 10% or grater.
# ?( D/ h  \2 b, |2 o5 a6 a
  u' Y, ]4 A$ A8 Y0 e3 U

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