DSH 753 Capacitor discharge voltage measurement

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 753 % R( R( ^& N7 J7 c; h8 a, ^* H

Capacitor discharge voltage measurement 5 C$ z, n$ x2 c: i

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

61010-1(ed.2) & 60065(ed.7) * H( r/ y5 L( N4 A2 p6 n

' F' N4 f8 v- O, Y$ GStandard(s): No. Year
IEC60065/2001
. Y- W, }+ s- D3 N. HIEC61010-1/2001
DSH 0753
" J7 ~. s8 i- x5 d+ \2 N, N" I2009
Category:
! X8 {2 F6 m& C, z/ \TRON, MEAS
% }; J: Q2 B/ p$ OSubclause(s):
9.1.6
* b7 r4 j4 F4 J  }. Y6.10.3
Developed by:
3 F7 P% [% z1 C& [$ lWG4, ETF2, ETF3
( ]! N# u/ z0 H/ l! z- g5 ASubject:
Capacitor discharge
voltage measurement
Key words:
" _4 V* S  W- F3 l- Plug discharge
- Capacitor discharge
  ~* g% o4 E' h9 h& }- Shock hazard
, y8 e3 x1 }" jApproved at the 47th CTL
Plenary Meeting, year 2010
3 m% P+ m+ D$ Z7 F; @2 T, J3 x; aQuestion:
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
" j! Q* r3 x, v$ k6 Tthe 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
2 \9 C% E- w0 L! t* o, Xthe intent is to disconnect at the highest voltage possible in the AC power cycle. With the
advent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in
the AC cycle. Using this procedure seems to be within the intent of the standards and would
4 r6 x; a: j4 D! e9 p9 Y6 Wresult in more consistent and repeatable results. Is it acceptable to perform the test this way?
+ H0 W5 ~- ?" h0 a: W9 e* ^' V4 W, [(2) Good laboratory practice dictates that the voltage should be measured with a high input
1 _6 y! q* y9 o+ S) R9 `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
& s, h0 L, v  e. p' t, D4 }4 |% S  Dconsistent and repeatable results should this type of meter always be used for this type of test?
Decision:
) L0 U4 D" b8 _* j(1) Yes, this method should always be used for these tests within the CB Scheme.
' [" c/ K! d' A- |(2) Yes, a meter with the stated input impedance should always be used for these tests within
the CB Scheme.
4 s1 B* Y! H; N6 T( x3 w
- @# K# W( ?+ z5 \( `; E