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引用第9楼zange007于2011-12-06 11:17发表的 :) e. i$ |$ l* c m; `4 `: B
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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);- n8 O* E& \) M( }) o2 s+ O% V2 d
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?9 w! f8 w7 K% d$ }9 K+ z
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,
$ \. H; z0 r" j& Y4 [ Gterminal A of the measuring instrument is connected via measurement switch "s" to the main7 E& _7 f8 @0 ^0 u& ?7 O
protective earthing terminal of the EUT, with the earthing conductor switch "e" open.
, x7 k* x# @' n( N5 |4 LThe test is also conducted, on all equipment, with terminal A of the measuring network2 x, [7 y6 Q( {; r3 C. h) p, t
connected via measurement switch "s" to each unearthed or non-conductive accessible part
3 r) u" R, d1 h3 n. q) ^and each unearthed accessible circuit, in turn, with the earthing conductor switch "e" closed
1 E! N8 G2 _4 `6 X9 |' z/ o这是标准上面说的,意思就是有地断地,没地接地~~
1 L4 c+ _7 Z6 M X1 \0 L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 main3 f0 Y M/ I3 ` e) y4 R, E! W. }
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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