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[MEAS] DSH 753 Capacitor discharge voltage measurement

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发表于 2012-9-18 11:21 | 显示全部楼层 |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)6 l. n" n1 F; s3 ~. h

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2 I% |9 ]. m: d8 c& gStandard(s): No. Year
# ~: f$ S% v* U( B. O+ h- x+ DIEC60065/2001
/ t, n: F* N1 Q0 [- ]& t# {IEC61010-1/2001
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2009 DSH 0753 TRON, MEASCategory:  + s) c& S& K3 V: v! D0 z* K
9.1.6Subclause(s):
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, m, v) ^& X, ZDeveloped by:
3 w  _5 x- z" xWG4, ETF2, ETF3
5 x3 k; W: j7 S+ g/ k! p% @Subject:$ T% y# h$ U' P6 W  n
Capacitor discharge
! T( P5 @) f: d8 pvoltage measurement
4 X6 a, X/ J7 Z& yKey words:
) x  {7 E' A7 {) U/ |; J: u- Plug discharge
' l7 A+ o1 s3 Z% x* V- Capacitor discharge
/ `  Z% i! U. @& z- Shock hazard4 U" M- K, x1 S4 ]+ D/ Y2 u: j2 {4 g
Approved at the 47th CTL$ M" x, P" [) }+ c3 N8 [
Plenary Meeting, year 2010( _5 r: D; v/ \. Q
Question:
1 ]9 {5 f2 @$ ?. W2 pThe standards referenced include a test commonly referred to as a plug discharge or capacitor
$ J; o5 G( t9 tdischarge test that involves disconnecting the product under test from the mains and
  ~& x7 b; X! Rmeasuring the residual voltage across a capacitor(s) at a specified time. The intent in each of) H' s$ E0 P$ M1 @
the referenced standards is the same – measure the maximum voltage obtainable at the time
8 t5 |. J$ A9 J1 Vspecified.
4 e& ]) ~1 z7 h" b2 D/ V(1) Each standard has a slightly different description of how the mains disconnect is made, but2 r' X5 H+ O. G, l  a% C0 |  h
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the
8 c5 d$ K( w! }( J' s7 o" P9 padvent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in$ G0 N9 N; U* Z
the AC cycle. Using this procedure seems to be within the intent of the standards and would
; w, ~3 w# _- ?3 a6 Dresult in more consistent and repeatable results. Is it acceptable to perform the test this way?
) K  K( F: f; X  C! p(2) Good laboratory practice dictates that the voltage should be measured with a high input1 ]9 N% v. d5 R+ o) D- g
impedance voltmeter. For this test, some standards require the use of a voltmeter with an input5 Q: H* x4 r# V7 y* S+ y
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more1 _" u. i, R* y0 E+ w6 X8 h
consistent and repeatable results should this type of meter always be used for this type of test?, D5 B# M9 C1 c1 q
Decision:& n! M0 p7 x0 M2 e+ L( u: |
(1) Yes, this method should always be used for these tests within the CB Scheme.
3 {: v7 }7 j* p2 E& F(2) Yes, a meter with the stated input impedance should always be used for these tests within! A$ o3 v8 P8 N' p/ Y) Z1 p
the CB Scheme.
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