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引用第9楼zange007于2011-12-06 11:17发表的 :
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非常感谢您。我有疑问的是:测试输出端子断地测试,是从输入端把断开(线路中的E开关);
8 J% n( T0 C. a" a8 u7 c' |4 y9 H# a还是从次级把输出负与地线断开呢(就是把地线接次级点断开)。有什么判定依据吗?从标准里哪能找得到呢?
B: `$ W# L/ f5 E1 } S因为以上两种断地测试的结果是不一样的,假如初级有与地的桥接Y电容的话。 For equipment having a protective earthing connection or a FUNCTIONAL EARTHING connection,9 M7 q8 [8 v2 G" \, w$ d$ m
terminal A of the measuring instrument is connected via measurement switch "s" to the main
5 ^. Z( w3 N, q1 [# Yprotective earthing terminal of the EUT, with the earthing conductor switch "e" open.. I8 r3 Y/ Z! A2 @* B5 j! w3 B0 E
The test is also conducted, on all equipment, with terminal A of the measuring network
, G, {6 K$ B% N& @6 b, f' Vconnected via measurement switch "s" to each unearthed or non-conductive accessible part
2 ^3 ?, Y/ Q% Y. l( n3 I3 w& H! J* B$ pand each unearthed accessible circuit, in turn, with the earthing conductor switch "e" closed. l7 J9 c8 c& y7 ~, A1 I4 P
这是标准上面说的,意思就是有地断地,没地接地~~
+ |2 T* W& |2 }& \% j5 _1 t7 ^7 c如果你输入地断开来测得话,那得按3.5来卡(这和测接地金属外壳是一样的结果),但是标准里面讲我们测得地方是switch "s" to the main" S. s+ {9 \2 q. I" C) P
protective earthing terminal of the EUT,输出端子负端接地如果不能过接地连续性测试的话,他只能算是功能地,按没有接地的方式来测,输入的地接上,输出的地如果不断开测得值是个定值上面我有说过,所以输出端子负端地断开,那就按0.25来卡,一般是按这种方法来测得。 |
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