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引用第2楼roy517于2007-11-06 12:02发表的 :
) M+ ]' c$ [. O/ s( Q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: J. D1 S3 i5 w( Y, i3 m* @
a) 42.4 V peak for sinusoidal or nonsinusoidal AC;0 J+ t& ]/ B. \5 D9 P
b) 60 V for continuous DC;
1 N, }" v5 |: Tc) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and
; _- N, ~/ }; t" dd) As indicated in Figure 14.3 for combinations of AC and DC.
& N( U; y' }3 Q8 O8 TFor 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.& G3 {1 L# \/ K' }' x
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"Since short term peak voltage is of interest during tests involving a fault," |
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