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引用第3楼aha0827于2011-04-15 13:47发表的 :
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UL1031是哪个版本,我使用的第5版(2009)没有该条款耶!
C, S/ r$ o2 p: b在UL60950-1中插孔极性标识是通过以下来规定的吗?; |5 S2 k v2 K7 z* z
----Symbo for nature of supply , for d.c. only " L4 B( g @6 P9 E
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UL60950-1 中是通过Symbo for nature of supply , for d.c. only规定的,而且还可以参考TableNAA.1(informative)1.7.1
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/ T/ @8 x# p# n/ S& \3 N& m1.the following information may be provided: c)rated output frequency or frequency range or symbol for d.c
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' d: d# c' U4 b9 b4 PUL1310 我刚才看到是2001年的,第五版在clause 51.6
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) k( r! S( w6 t" r& P6 Y$ i) wThe polarity of a direct-current output shall be plainly marked, unless the unit is provided with a$ y4 m2 t7 ~, b+ S1 W+ T
polarized termination. |
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