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看了一下IEC 60950-1 2nd的clause 2.1.1.7裡面有一段敘述:
. i( C6 N2 x$ s; Z7 C1 _* VThe relevant time constant is the product of the effective capacitance in microfarads and the
* v3 u- a/ m/ W( f9 G$ Y1 [effective discharge resistance in megohms. If it is difficult to determine the effective2 m. K' Y) S' r& a% I
capacitance and resistance values, a measurement of voltage decay at the point of external/ P9 z0 {; R; R7 w x) N
disconnection can be used. When conducting the voltage decay measurement, the result is, s: h* A1 u" N O; ]
referred to an instrument having an input impedance consisting of a resistance of
j* V; F/ v% V2 n100 M Ω ± 5 M Ω in parallel with an input capacitance of 20 pF ± 5 pF.
" e# T/ V. N, t- n7 N# y- }) K不知道這算不算有要求 |
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