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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);
9 S; t% n0 `5 Y I' m4 ^ X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?
# c! Q6 J& W9 X7 W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,
' m; d8 Q8 l. ?9 pterminal A of the measuring instrument is connected via measurement switch "s" to the main# _& e# A+ n% V* H5 G, g* B( N; _
protective earthing terminal of the EUT, with the earthing conductor switch "e" open.
5 Y* Z, T1 Y: Y, l8 LThe test is also conducted, on all equipment, with terminal A of the measuring network7 [) M8 D6 {; K: g8 Q0 S0 W3 C
connected via measurement switch "s" to each unearthed or non-conductive accessible part
% f6 R* `9 s0 V& sand each unearthed accessible circuit, in turn, with the earthing conductor switch "e" closed
( {( o9 {: h$ u- X这是标准上面说的,意思就是有地断地,没地接地~~$ B% E* a* f/ M* F$ Q
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
8 B( S' |# p" G, fprotective 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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