DSH 753 Capacitor discharge voltage measurement

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DSH 753 2 {2 R( Q5 r$ ?( S# Y) e( w6 ?" q# ~ 6 U* u2 J/ q8 @

Capacitor discharge voltage measurement ( }1 }! {2 [& _( V! V6 o+ V

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

61010-1(ed.2) & 60065(ed.7)

  N- s0 M2 \/ c; d4 e- \* I  `/ q3 oStandard(s): No. Year
IEC60065/2001
, F% D! [1 T# b- j) ZIEC61010-1/2001
DSH 0753
8 ?  q  O1 Y7 {2 ~! O7 @6 o; q2009
Category:
TRON, MEAS
8 r; \- d+ L  I7 A3 I3 J! vSubclause(s):
/ A+ C* X7 F9 f2 _2 q5 I9.1.6
6.10.3
( z% `$ y! o; A- V( v  p; aDeveloped by:
WG4, ETF2, ETF3
/ e  A" y3 f1 y  [Subject:
5 E" {6 {  \/ Z% E1 R) NCapacitor discharge
voltage measurement
Key words:
- Plug discharge
- Capacitor discharge
- Shock hazard
" A+ q. y7 \$ }( C) dApproved at the 47th CTL
Plenary Meeting, year 2010
Question:
The standards referenced include a test commonly referred to as a plug discharge or capacitor
: L, }' T# |6 ?. e  w' h% Edischarge test that involves disconnecting the product under test from the mains and
  q4 C2 h+ r- e1 B5 f5 xmeasuring the residual voltage across a capacitor(s) at a specified time. The intent in each of
8 A  C# Y, _* V: Y; S5 Ythe referenced standards is the same – measure the maximum voltage obtainable at the time
specified.
(1) Each standard has a slightly different description of how the mains disconnect is made, but
8 U! X2 Z4 N1 C0 @, O4 k  pthe intent is to disconnect at the highest voltage possible in the AC power cycle. With the
  ]) ~- _9 ?( ]2 v) L) R6 Vadvent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
  `) Y' V$ o8 b6 ]0 q: K) W! Xthe AC cycle. Using this procedure seems to be within the intent of the standards and would
4 `. W: T- C" D7 ~result in more consistent and repeatable results. Is it acceptable to perform the test this way?
& b/ G( Z3 T3 J' I(2) Good laboratory practice dictates that the voltage should be measured with a high input
impedance 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:
2 q! l$ J! h* k  I* a8 `& E$ W(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
4 t/ b3 Z1 A. e/ q) z: n2 xthe CB Scheme.

5 z& [+ t% A  ~+ e7 c: M