PDSH 1003 Sampling plan

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PDSH 1003 & V% w+ A! k; o1 }1 _ 3 l; t7 S7 N; M6 A4 n, D, q- P. I

Sampling plan , C2 F4 v# j1 H' F  c4 }% P

4 / 3

61048(ed.2) & 61049(ed.1)

Standard(s):
IEC 61048/2006
  n# T* m8 r0 Y4 ^. [* q* f' ^IEC 61049/1991 Ec/1992
Subclause(s): 4 3
9 f- M" q6 E) d  X$ Z4 cNo. Year PDSH 1003 2010
% l* `$ D0 X- ~! \( ]Category: LITE Developed by: ETF5 OSM/LUM
Subject:
Sampling plan
Key words:
- Capacitance
1 y1 S) x! y( d! I1 @' X# A; S6 b- Self-healing capacitor
- 50 capacitors
To be approved at the 49th CTL Plenary Meeting, in 2012
' f3 V0 j9 Y$ A1 c# h0 [2 r6 UQuestion:
1 k5 R2 @( S: L, y& a8 [In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for the sampling plan are provided. Beside the main
, z1 q& t1 B9 t) w, F2 G6 crule, the following additional statement is given: “The capacitor with the maximum capacitance per unit
surface area shall also be tested if this ratio exceeds that of the maximum capacitance value in the range
; k. s  C9 _3 V- s8 B3 k# H9 kby 10% or greater. Similarly, the capacitor with the minimum capacitance per unit area shall also be tested
4 W0 G# e1 }1 Xif this ratio is less than that of the minimum capacitance value in the range by 10% or greater”.
) P6 y" @* X) q1 s+ H9 y, hNevertheless, the sampling plan is not well specified when the above case occurs. What is the composition
of the final sampling plan for tests?
Decision:
. J8 O# u7 _: ]; N! A0 M1 V  sFor the time being, apply the following proposed solution:
9 s* J& J& h, m" V8 r% ~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
: H8 a' K( A( ^. U. A3 S0 u4 c! jcapacitance per unit surface area exceeding that of the maximum capacitance value in the range by 10%
5 ?5 p6 X( U. Sor greater. Similarly, each of those groups, shall contain as nearly as possible equal numbers of capacitors
6 K; g, a) f8 Dof the lowest capacitance and of capacitors with capacitance per unit surface area less than that of the
* R5 i; n7 x' B. I% l9 qminimum 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:
! r4 s+ G& z5 c9 ~1 T1 s- 12 (13) capacitors of the highest capacitance in the range;
* Y% [7 d: @2 K) [. y& U7 C0 t, M- 13 (12) capacitors with the maximum capacitance per unit surface area exceeding that of the
* k9 D& W: j5 O. u+ L2 omaximum value in the range by 10% or greater;
: j. U3 R" o: T7 ]- [$ {9 G- 12 (13) capacitors of the lowest capacitance in the range;
- v/ }' \  V3 F% x. K: Y- 13 (12) capacitors with capacitance per unit surface area less than that of the minimum capacitance
value in the range by 10% or greater.
' q0 P! N; ], S* @8 `. B6 F3 V/ Y
! W- T, T3 G$ x- i