DSH 753 Capacitor discharge voltage measurement

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DSH 753

Capacitor discharge voltage measurement

9.1.6 (IEC60065/2001) 6.10.3 (IEC61010-1/2001)

61010-1(ed.2) & 60065(ed.7) ; ^. w- s% M2 Z  [

Standard(s): No. Year
IEC60065/2001
IEC61010-1/2001
( U3 t3 z: c8 t+ n, V6 x* u. z2009 DSH 0753 TRON, MEASCategory:  
9.1.6Subclause(s):
8 R2 l% Q# S3 F* H/ l' \6.10.3
Developed by:
" k$ l8 k: R+ q+ h! e3 R+ G1 YWG4, ETF2, ETF3
Subject:
/ ]+ l* L, [  W. tCapacitor discharge
/ C9 G* b' B& C/ }6 yvoltage measurement
: h6 z3 q- z+ E3 ?Key words:
  y0 E+ d7 R" @; ]+ ]* n. T- Plug discharge
$ C" U6 H& G' _" q! R6 X# J& i- Capacitor discharge
- Shock hazard
Approved at the 47th CTL
; ^2 e' ^8 H$ H2 u7 tPlenary Meeting, year 2010
Question:
+ q, h% C3 J% e7 L7 {The standards referenced include a test commonly referred to as a plug discharge or capacitor
discharge test that involves disconnecting the product under test from the mains and
measuring the residual voltage across a capacitor(s) at a specified time. The intent in each of
the referenced standards is the same – measure the maximum voltage obtainable at the time
specified.
' T& ]3 X& A: b% _! h1 R. T7 I. x(1) Each standard has a slightly different description of how the mains disconnect is made, but
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the
- S. Z1 a) m) l6 H( u5 radvent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
0 a# G+ N3 E+ F' q7 P# kthe AC cycle. Using this procedure seems to be within the intent of the standards and would
# i) z0 a, v( U% x/ F1 d8 _. \  F8 Mresult in more consistent and repeatable results. Is it acceptable to perform the test this way?
6 u2 I  x" e1 O1 C+ ^8 S(2) Good laboratory practice dictates that the voltage should be measured with a high input
. d! ^' ~" V+ A& v5 @6 R6 T% Bimpedance voltmeter. For this test, some standards require the use of a voltmeter with an input
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more
consistent and repeatable results should this type of meter always be used for this type of test?
Decision:
(1) Yes, this method should always be used for these tests within the CB Scheme.
(2) Yes, a meter with the stated input impedance should always be used for these tests within
the CB Scheme.