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引用第2楼roy517于2007-11-06 12:02发表的 :" g! j4 ~7 A3 A" F
为什么呢？能说明原因吗？麻烦了！
UL1310
9 H% d- w* l- j4 a5 { n0 w/ P2 ^) g) K0 J& w
14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:8 W- P: h ~, r0 Y7 y
a) 42.4 V peak for sinusoidal or nonsinusoidal AC;
1 y* _6 {# c; B. d, Q, x7 ^b) 60 V for continuous DC;) J; J) ]7 l0 s+ z) v8 R( |/ ^9 u
c) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and
3 ?6 T- m) Y0 S9 C1 ~: zd) As indicated in Figure 14.3 for combinations of AC and DC.
B0 y% \' Q( o, i/ i! p' D1 rFor 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.& I5 l4 Z! ]/ Q5 z
8 j+ ^9 X* m+ ^( @# O t% m: [$ C
- v) Z$ }% X8 Q2 X: {5 D! X"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
