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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:
% ?- t7 P& {0 i) y' f+ p6 ]The relevant time constant is the product of the effective capacitance in microfarads and the! C! q/ d5 h6 Q/ x4 S+ V4 \' F
effective discharge resistance in megohms. If it is difficult to determine the effective
* Z7 m/ u2 N% O1 V2 Kcapacitance and resistance values, a measurement of voltage decay at the point of external
) b7 L' T) j+ Z( p8 `% H2 e- b, y7 S/ Hdisconnection can be used. When conducting the voltage decay measurement, the result is5 z( z) b) _) c8 d7 q
referred to an instrument having an input impedance consisting of a resistance of
) w1 z4 i% w" k" M* }# t100 M Ω ± 5 M Ω in parallel with an input capacitance of 20 pF ± 5 pF.
6 E" ~- r+ n" z6 ]不知道這算不算有要求 |
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