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引用第2楼roy517于2007-11-06 12:02发表的 :
2 |! P+ L7 ~+ W) b: _( |$ r+ @, }为什么呢?能说明原因吗?麻烦了!
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1 C9 e& ^ O/ ~' i; X' ?14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:
' |) ~ L0 v) R7 V2 q9 v7 La) 42.4 V peak for sinusoidal or nonsinusoidal AC; Q' W6 Z! f+ E' T8 L% `. B
b) 60 V for continuous DC;
3 J3 [# `& z8 C6 y- k& qc) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and. |8 D/ E2 ~5 H$ y0 N* E5 K
d) As indicated in Figure 14.3 for combinations of AC and DC.
7 {% k# Q4 k% z2 yFor the purpose of this requirement, initial transients lasting less than 200 milliseconds may be ignored. Since short term peak voltage is of interest during tests involving a fault, voltages are to be monitored by using a storage oscilloscope for the first two seconds after any fault is introduced.
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"Since short term peak voltage is of interest during tests involving a fault," |
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