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|  DSH 753
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. z$ G/ M; W9 N! q | Capacitor discharge voltage measurement' G* T* }5 J8 L* c2 H( ]4 E
| 9.1.6 (IEC60065/2001) 6.10.3 (IEC61010-1/2001)
7 ?( n. O% I. y( I3 {. b+ U | 61010-1(ed.2) & 60065(ed.7)' O5 {( o* T0 Q4 j6 p, A; u$ a& t$ ^
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Standard(s): No. Year
1 o* d+ U# x' C r5 b; @IEC60065/20012 U* o0 `, ~9 S& y! |
IEC61010-1/2001
1 `6 U2 @7 b5 _# tDSH 0753
6 f( _8 Q! E$ u( U1 }- l2009
9 V3 _# U) X% Y0 u0 rCategory:
) Z% f6 ?% d Y) r: s) oTRON, MEAS) ?& D& z( w0 K
Subclause(s):
7 S& l- S' h, ?9.1.6! x* [5 e. w" b; O: n K
6.10.3
9 M$ o' {) k5 G! m6 D% P+ tDeveloped by:9 r" H. O& P! o
WG4, ETF2, ETF3' Z( F% `: T) f K, y" A
Subject:8 p1 l: x" s- P' o4 k! N
Capacitor discharge1 z- e# a! x& Y" g- h3 b% S8 E
voltage measurement
- }! Z; _) v# o0 x8 E eKey words:" [* Z" k7 n- [8 @7 O
- Plug discharge
# q7 m" O; Y% J4 F k1 u' U- Capacitor discharge
4 N! c4 h7 F5 T- Shock hazard
$ N: O" U+ O6 E4 G6 n4 |, V& H+ l2 SApproved at the 47th CTL4 C8 _: k5 G1 M' N9 x! a
Plenary Meeting, year 2010
" z$ U) ]8 v7 TQuestion:
# q6 R" ~/ t+ M3 X- @The standards referenced include a test commonly referred to as a plug discharge or capacitor
- K* n# q' c( e; r- a% ddischarge test that involves disconnecting the product under test from the mains and+ j$ M+ h# W1 _/ ?/ c
measuring the residual voltage across a capacitor(s) at a specified time. The intent in each of
* d% {+ G9 ]- I1 ?$ u( |3 I' \the referenced standards is the same – measure the maximum voltage obtainable at the time9 Q9 q$ b8 }! K
specified.
* Z% L$ e# \0 O% Y0 n(1) Each standard has a slightly different description of how the mains disconnect is made, but7 z& A' j1 O+ [ S7 C) I1 ]$ J8 z
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the* U5 f* n0 [+ P7 N& _
advent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
. q% }. U9 N3 E3 ]" lthe AC cycle. Using this procedure seems to be within the intent of the standards and would
* Q3 ]5 x5 E' V! _0 A% A& Fresult in more consistent and repeatable results. Is it acceptable to perform the test this way?6 E2 W4 f. d- b9 W$ H. _! N
(2) Good laboratory practice dictates that the voltage should be measured with a high input
7 q6 j2 m6 a# ^1 S, i5 {impedance voltmeter. For this test, some standards require the use of a voltmeter with an input) [& H0 o# l& W) h& N2 e3 Z" t2 s3 x% \
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more1 J: k3 `- _% S6 P4 s
consistent and repeatable results should this type of meter always be used for this type of test?: [! [) o. c! w, z2 T; D
Decision:+ I! m8 S5 m, c( E
(1) Yes, this method should always be used for these tests within the CB Scheme.
( p7 u3 p- ~ P' w(2) Yes, a meter with the stated input impedance should always be used for these tests within
+ ?$ n+ d* |( rthe CB Scheme.
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