DSH 302 Capacitance

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DSH 302 0 L# u; l& n& j4 N* G5 S) q

Capacitance

6.3.1.3 ! u+ }7 V, I. h7 ~# }+ h1 j- W* o

61010-1(ed.1);am1;am2 : `6 e& W5 f! Q" C* U4 U

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Standard:
; \5 m! }5 e0 Q7 LIEC 61010-
2 {: Z3 \0 K( n' M6 K1:1990+A1:1992+A2:1995
  V0 N, l+ U- MSub clause:
6.3.1.3
' P( l& D' g5 q( O' ]Sheet n. 302
Page 1(1)
Subject:
Capacitance
Key words:
- Capacitance
- Charge
/ I+ a3 U+ p2 m; oDecision taken by
# i  J7 o8 F8 ^( M! y/ \  U* GETF3 and confirmed
by CTL at its 38th
8 D# ]: m$ i. V) T9 o% {meeting, in Toronto
3 A: b5 ?# O9 h8 d0 x9 }Question:
How can the stored charge be measured, in particular where the circuit is complex?
& V2 Y- U) E) C  xDecision and Explanation:
Only the charge accessible to the user is of concern under the standard. Therefore, where the
% ~, W# Y: p; s, F3 Kcircuit is complex, it is considered that a method of measurement from the accessible part is
4 u$ U# H2 V+ ?1 lneeded. It is, therefore, recommended that a procedure of discharge through a defined
! {/ I- X8 E5 U& ~1 M# Q: }* A! zresistor is used, monitoring the voltage – time profile to provide a method of calculation of
0 B+ F7 M4 f) M$ _6 vcharge.
8 k0 v8 C! `9 O* h3 [When this method is used it is requested that details are recorded in the report for the benefit
) m0 u% B& ^* C! U- I/ D6 Z: N" Nof CB members.
The method described in IEC 60950 Subclause 2.1.10 is recommended.
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