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[MEAS] DSH 753 Capacitor discharge voltage measurement

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发表于 2012-9-18 11:21 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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DSH 753
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Capacitor discharge voltage measurement
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9.1.6 (IEC60065/2001) 6.10.3 (IEC61010-1/2001)
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61010-1(ed.2) & 60065(ed.7)5 i. [. G7 A& M0 P$ ]1 q) l9 {# U
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Standard(s): No. Year
) A3 w& d. R% G5 R. A* N: VIEC60065/2001
5 C( ~) G5 ~8 M% i! q2 nIEC61010-1/2001
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2009 DSH 0753 TRON, MEASCategory:  
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9.1.6Subclause(s): : E8 j+ m; J' q& D
6.10.3
/ Q/ t* {; J; R! c, xDeveloped by:2 v, E4 F8 E$ j; ]
WG4, ETF2, ETF3$ {1 x! c* o; t
Subject:5 M, Y  t/ ~/ C/ Q, D
Capacitor discharge
, X7 `' \1 H: o  V0 D5 r9 U2 L) xvoltage measurement
9 W' z) @: j, QKey words:5 |$ h) |8 U! v  H8 c
- Plug discharge$ G9 L6 ]% b/ G+ T8 n: k
- Capacitor discharge
4 A& N1 }% |. K+ N3 u0 k/ _- Shock hazard
' d! [! k2 K8 VApproved at the 47th CTL
3 N: j& y2 ~/ `4 i7 i5 x) IPlenary Meeting, year 2010
9 O  l! C6 t" v5 B& ~Question:9 D0 h6 _4 d  q" l
The standards referenced include a test commonly referred to as a plug discharge or capacitor+ ]; E5 a1 F( n
discharge test that involves disconnecting the product under test from the mains and
& l1 \7 D7 S7 b' E# w+ q2 F4 \/ Vmeasuring the residual voltage across a capacitor(s) at a specified time. The intent in each of( i( }$ I! p6 J: C. f9 e
the referenced standards is the same – measure the maximum voltage obtainable at the time
2 P2 c6 y) y! N: G4 Vspecified.
* b) y, m6 k$ r0 N! w; K8 a( H(1) Each standard has a slightly different description of how the mains disconnect is made, but, s7 H0 f9 F/ x& N1 N
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the
) y1 p% v/ j8 Madvent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
& J% L' q; G+ Y; j* B  gthe AC cycle. Using this procedure seems to be within the intent of the standards and would3 g# r4 C5 I- I3 k6 `
result in more consistent and repeatable results. Is it acceptable to perform the test this way?- q4 Q! m4 \) p% m
(2) Good laboratory practice dictates that the voltage should be measured with a high input
7 K" o' G2 K7 ~: _, n" aimpedance voltmeter. For this test, some standards require the use of a voltmeter with an input* B/ D- J3 ^# z6 O1 w* p, J3 f" K$ ^# U
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more
$ A& p5 g% R4 G& D$ ^7 lconsistent and repeatable results should this type of meter always be used for this type of test?
* j6 D/ K/ d2 E0 E, `  L5 lDecision:( Y* t3 M2 y7 ^4 {" Y
(1) Yes, this method should always be used for these tests within the CB Scheme.
1 w, |: D# b% `9 d(2) Yes, a meter with the stated input impedance should always be used for these tests within
( {, y2 i3 B. k4 d3 R+ F" e- J4 Uthe CB Scheme.8 I$ g2 r3 g/ ^$ r7 T7 F* P+ b3 j
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