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| Capacitor discharge voltage measurement5 Y# o! U% ?/ c+ p
| 9.1.6 (IEC60065/2001) 6.10.3 (IEC61010-1/2001), q- v5 Y8 R0 M5 `7 _2 w$ }
| 61010-1(ed.2) & 60065(ed.7)
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Standard(s): No. Year# I, w1 R3 L1 Q! j f" Z& }
IEC60065/20010 @, z @1 u* M/ f; \- i
IEC61010-1/2001
. r3 C' |9 V/ |9 J' a% e: c8 D2009 DSH 0753 TRON, MEASCategory: . I- U7 N/ K6 p z
9.1.6Subclause(s): 5 s4 g7 K% }7 A6 U9 e4 c& U# Y4 M1 j
6.10.3 \5 N' N( \7 b; E
Developed by:
o S! h4 F& b1 p* \WG4, ETF2, ETF38 B! y" u1 @7 J, s
Subject:
1 X3 y2 R- f2 p- K8 g/ ZCapacitor discharge
8 U8 T4 W4 p9 g" G) mvoltage measurement
! a4 a6 z; P2 g8 A7 J1 ]/ rKey words:7 `$ R: `- n$ C
- Plug discharge3 P2 D9 R3 k5 z
- Capacitor discharge
) k+ f7 h0 W7 W1 a- \- Shock hazard
8 J8 A5 D$ v9 W- Z) w! S+ _- m+ `Approved at the 47th CTL
0 A! R7 z& w3 D2 @6 |4 VPlenary Meeting, year 2010
9 E" T" r. P C% pQuestion:
- ?0 `" r8 H6 x8 n& e/ fThe standards referenced include a test commonly referred to as a plug discharge or capacitor
& ^: x* u+ q2 C! h; bdischarge test that involves disconnecting the product under test from the mains and
8 @: n; h3 z2 F0 N& q% h' _0 xmeasuring the residual voltage across a capacitor(s) at a specified time. The intent in each of4 p, Y3 z6 _: [( m2 o. Q
the referenced standards is the same – measure the maximum voltage obtainable at the time
8 X5 I& s1 A6 N4 {2 uspecified.
& d! n6 H5 M3 ^( h% N9 S' O- R p6 i8 j(1) Each standard has a slightly different description of how the mains disconnect is made, but2 q5 q9 h& W, o4 H
the intent is to disconnect at the highest voltage possible in the AC power cycle. With the& |8 p0 x: ~1 e/ }/ v
advent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in) p+ b) [( L4 ? ?
the AC cycle. Using this procedure seems to be within the intent of the standards and would
; D5 }; P2 {; s; J# ?result in more consistent and repeatable results. Is it acceptable to perform the test this way?
. ]. U2 B* I! _% o! f& W: `4 \# h9 ](2) Good laboratory practice dictates that the voltage should be measured with a high input
& x4 O8 Q3 D8 V1 y* pimpedance voltmeter. For this test, some standards require the use of a voltmeter with an input+ D; k+ ^# t* v: `/ W" a
resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more. r% a% p: H4 p- K
consistent and repeatable results should this type of meter always be used for this type of test?2 v6 k5 h6 z7 `4 H5 _2 A
Decision:
+ b/ ^4 T1 z5 m+ Y1 h7 D(1) Yes, this method should always be used for these tests within the CB Scheme.
2 N* e# i: \: R, Z' T(2) Yes, a meter with the stated input impedance should always be used for these tests within% |/ W2 X8 a; ]9 H- d
the CB Scheme.
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