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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:" N' h" F* {" Z' o8 w5 |
The relevant time constant is the product of the effective capacitance in microfarads and the
# z% i2 y q& I! t* b2 Weffective discharge resistance in megohms. If it is difficult to determine the effective& w8 Q* j* j7 j
capacitance and resistance values, a measurement of voltage decay at the point of external
/ r8 k6 d! I9 Q2 M/ S& Hdisconnection can be used. When conducting the voltage decay measurement, the result is
! `3 g- H. L" I/ @3 D( D* n# U7 ireferred to an instrument having an input impedance consisting of a resistance of4 k0 v# p" { z& d$ V4 U) X
100 M Ω ± 5 M Ω in parallel with an input capacitance of 20 pF ± 5 pF.
8 I/ B, `& [6 r4 C2 o不知道這算不算有要求 |
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