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引用第3楼sinian519于2007-08-31 16:48发表的 :- b9 S& O& H. y5 x* r
我也不是很熟悉,请看标准UL153,Clause140.2
根據這個圖就對了.
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@- c2 q! J( T# R; q不過根據這個設備的要求, 發現標準存在問題, 請對照上面的圖再看此條, 一直困惑中:
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140.2.5 The measurement circuit for leakage current is to be as illustrated in Figure 140.1. The
9 y6 D2 X5 a; n- A; Z" bmeasurement instrument is defined in (a) – (c). The meter that is actually used for a measurement is
* v9 V% t1 R4 \7 m& ~1 H' I' Nrequired to only indicate the same numerical value for a particular measurement as the defined$ m& E' F9 m2 @3 F) d
instrument. The meter used is not required to have all the attributes of the defined instrument.) o1 t* Z# u( M0 n4 ^+ v% z
a) The meter is to have an input impedance of 1500 ohms resistive shunted by a capacitance4 l! r5 c% X- F Q8 q2 ]/ m" ?
of 0.15 microfarad.
! b( u, M" f" _b) The meter is to indicate root mean square values which is 1.11 times the average of the fullwave
9 a7 a3 f: Y n+ h5 F0 h0 ]rectified composite waveform of the current through the resistor.5 h& j4 J6 T/ r. p( j; K" ^
c) Over a frequency range of 0 – 100 kilohertz, the measurement circuitry is to have a! p5 b* |: R. g( @
frequency response – ratio of indicated to actual value of current – that is equal to the ratio of: v5 g3 N9 T8 X. a
the impedance of a 1500 ohm resistor shunted by a 0.15-microfarad capacitor to 1500 ohms. At2 A2 G; D9 z& }) |' n0 w
an indication of 0.5 milliamperes, the measurement is not to have an error of more than 5- f' g% i3 e0 a k& |6 v
percent at 60 hertz. |
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发表于 2007-8-31 16:06
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发表于 2007-8-31 17:25
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