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|  DSH 7537 t) G0 L' O- b" \
" }# g9 n# q1 ~7 h' t7 ]4 { | Capacitor discharge voltage measurement
* R! I' _9 m# r1 F, P | 9.1.6 (IEC60065/2001) 6.10.3 (IEC61010-1/2001)/ ?$ J, T8 _" j! d% ]
| 61010-1(ed.2) & 60065(ed.7); P1 U* K4 S+ [, s* W0 T! M3 n
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+ U/ V) ~8 K" b, L6 L. L! S; E! ZStandard(s): No. Year6 p: }. k4 ~/ Z7 E. _4 P( O. m
IEC60065/2001
; f0 r7 G( e9 @6 o( OIEC61010-1/2001% C$ A1 u; S/ c/ m9 Y2 b
DSH 07532 S, v* `' I9 t1 Y
2009 O8 J: a* d6 M/ w' Y! Q
Category:
" e- y8 w9 T. N' Z$ MTRON, MEAS
( |& R9 ?2 Y$ @% n! ]$ P2 mSubclause(s):) v8 K+ P' ~; ?. u
9.1.6
' S- R8 B3 M) _5 S8 R5 j4 d# {6.10.3
. v, U% X( y; m" t; t' pDeveloped by:
& a1 W( F+ ]) i' lWG4, ETF2, ETF3* i! u. C5 X% Q2 r" A6 [
Subject:9 W( g0 s2 E4 [3 a" y2 F
Capacitor discharge
' R" q, M' l( hvoltage measurement# n: v# U1 I& t2 o [* z, C$ e8 M
Key words:
5 w; \4 y7 M; C1 Q1 L# g' b9 i, o- Plug discharge; Y" g1 ?9 X1 L, y
- Capacitor discharge: W5 r4 E0 b# `
- Shock hazard: V0 ~# ]7 k5 i9 f$ r5 Q
Approved at the 47th CTL& E/ ^0 q2 e; G' C1 [( N X+ D
Plenary Meeting, year 2010
2 F6 Z0 s# t* I) H: {3 t: AQuestion:
- D+ b6 Q( E9 hThe standards referenced include a test commonly referred to as a plug discharge or capacitor
- y4 l) l" } Q/ O9 r, odischarge test that involves disconnecting the product under test from the mains and
5 M# o6 X3 n, R7 b2 e0 cmeasuring the residual voltage across a capacitor(s) at a specified time. The intent in each of5 ~) ~. Q4 |- J' h
the referenced standards is the same – measure the maximum voltage obtainable at the time# y0 t i* j J) S: D3 ]
specified.' X* j; u. P& ^( I6 r. Q x" \2 d
(1) Each standard has a slightly different description of how the mains disconnect is made, but/ g* q8 y# z" R2 m4 Z0 o
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the
5 r& m8 o6 J7 p3 I9 [advent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
- r3 g/ y+ D+ @1 O3 f: K( k1 ^the AC cycle. Using this procedure seems to be within the intent of the standards and would) M1 x# f1 U. m7 n
result in more consistent and repeatable results. Is it acceptable to perform the test this way?. ~+ U# Z4 L$ M# P* d$ t& h
(2) Good laboratory practice dictates that the voltage should be measured with a high input4 T6 O, _! Y7 y* j
impedance voltmeter. For this test, some standards require the use of a voltmeter with an input) B; u! \2 C% r( L: `0 k
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more5 L( S [" a- z! H
consistent and repeatable results should this type of meter always be used for this type of test?
; s! y( c9 f5 c! e' [( fDecision:# `4 B, [! k% B6 t' [. _
(1) Yes, this method should always be used for these tests within the CB Scheme.* [ C9 e2 j( q% W7 H0 z2 Z
(2) Yes, a meter with the stated input impedance should always be used for these tests within2 L+ u7 X3 q1 @
the CB Scheme.
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