|
引用第3楼aha0827于2011-04-15 13:47发表的 :
+ I' b w" H' K) T# z1 A7 P1 s+ Y% ?. Q! m( A# @- p. o
& m: Q$ ^# r0 _
UL1031是哪个版本,我使用的第5版(2009)没有该条款耶!
* N6 q* D7 n- V. ^. `在UL60950-1中插孔极性标识是通过以下来规定的吗?0 s. p& u6 b6 R
----Symbo for nature of supply , for d.c. only U7 d2 p7 f6 K. T) j
6 Z, ]0 H8 n& I: J, `. a! T
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
" |! Z# g( C8 i& D8 @4 U/ }2 A0 q. m6 e) w" \' q
1.the following information may be provided: c)rated output frequency or frequency range or symbol for d.c# N9 l) m6 Q) m2 |: N( g7 y
% r+ g* \+ U7 l2 l, @
*************************************************************************************************; x0 `2 G" \/ v2 ^& P9 i
UL1310 我刚才看到是2001年的,第五版在clause 51.6( H* s9 s3 M; l
) A' i: F# j; c7 w( Y7 u6 D; K g
The polarity of a direct-current output shall be plainly marked, unless the unit is provided with a
. {, @7 o6 O! u" v9 f" O* Spolarized termination. |
|