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引用第2楼roy517于2007-11-06 12:02发表的 :2 _, K- w% B" q( q" d
为什么呢？能说明原因吗？麻烦了！
UL1310' @6 c5 A! w1 {+ p
0 n4 Q6 H' U5 w, e7 ?14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:
2 U$ `( D) e; j/ s/ C% Fa) 42.4 V peak for sinusoidal or nonsinusoidal AC;% K9 X+ U5 x |7 g* F% X& Y
b) 60 V for continuous DC;" @6 R: l. z4 S
c) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and ]& q. v: s/ O, } X& ]* t2 |
d) As indicated in Figure 14.3 for combinations of AC and DC.: K" E0 g* x% h
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.* s" C; ?; R$ p9 H; Z
3 E) K, ? C* d$ V7 a5 j
1 K& b1 ^ u- \7 a! G8 m7 q! ~"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