PDSH 1003 Sampling plan

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PDSH 1003 8 j) u' e9 ~. S

Sampling plan

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61048(ed.2) & 61049(ed.1) % l! A' v2 l/ r& W' S9 Z

Standard(s):
IEC 61048/2006
1 Z( k1 O, O4 Y/ T+ _IEC 61049/1991 Ec/1992
% h! f) H7 f% n9 lSubclause(s): 4 3
No. Year PDSH 1003 2010
Category: LITE Developed by: ETF5 OSM/LUM
Subject:
8 @% u' C0 m4 g& ~# [: zSampling plan
Key words:
- Capacitance
9 D! J" |: ^9 k- Self-healing capacitor
- 50 capacitors
. \2 j8 }% I  u- JTo be approved at the 49th CTL Plenary Meeting, in 2012
Question:
In § 4 of IEC 61048 and in § 3 of IEC 61049 rules for the 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 exceeds 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 10% or greater”.
Nevertheless, the sampling plan is not well specified when the above case occurs. What is the composition
of the final sampling plan for tests?
Decision:
7 i) J* n( R2 G$ ^  JFor the time being, apply the following proposed solution:
3 y+ ^  w4 g) p2 r8 v/ ?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
, e9 S! }% ~$ d) E% Fcapacitance 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 capacitors
5 {' U$ @! T" i  ]& q; [of the lowest capacitance and of capacitors with capacitance per unit surface area less than that of the
minimum capacitance value in the range by 10% or greater.
Example – IEC 61048 - § 11 – self-healing capacitor.
( M6 K" O4 h9 w& b5 e" N; \% BA sampling of 50 capacitors is required and according to the above decision they shall be split as follows:
1 U/ O, U. }5 a5 I8 ~$ s- 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
, [$ g* B$ P  Emaximum value in the range by 10% or greater;
& {, P6 o& b" V& n- 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 greater.
% g2 B: u3 ?: D( V

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