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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:
: ^: F) u: n' WThe relevant time constant is the product of the effective capacitance in microfarads and the
, C4 j3 k- `5 ]0 [2 S* t: neffective discharge resistance in megohms. If it is difficult to determine the effective* q' I; Z& O/ O2 [9 _8 N4 C+ ~7 W
capacitance and resistance values, a measurement of voltage decay at the point of external
* U! E. h J. L4 }disconnection can be used. When conducting the voltage decay measurement, the result is
7 q( n0 r; c; W2 [4 [% Y2 qreferred to an instrument having an input impedance consisting of a resistance of( c* Y: a+ E$ M8 `! {0 M8 ~
100 M Ω ± 5 M Ω in parallel with an input capacitance of 20 pF ± 5 pF.
3 b# U0 ]; }8 C* x& h# R不知道這算不算有要求 |
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