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引用第2楼roy517于2007-11-06 12:02发表的 :8 G5 W) d+ b) v7 z' S5 I( @
为什么呢？能说明原因吗？麻烦了！
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14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:
, y3 f# {9 ~% sa) 42.4 V peak for sinusoidal or nonsinusoidal AC;
t3 `: \% N9 ub) 60 V for continuous DC;$ m2 }5 j6 C* ]3 n
c) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and- I# U5 T4 u! f0 b7 u' i
d) As indicated in Figure 14.3 for combinations of AC and DC./ E7 E# V2 X% b: J! G$ n/ D
For 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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发表于 2007-11-6 11:53
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发表于 2007-11-6 12:20
