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引用第9楼zange007于2011-12-06 11:17发表的 :$ e- _7 [8 r7 b; X
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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);- L7 r6 ~1 R& g% L* i$ k6 g: Z
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?
! Z6 w' q' p+ E) y: M4 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,& f( U+ K: l" t' H% T# P' q
terminal A of the measuring instrument is connected via measurement switch "s" to the main7 u* O, K9 f4 D- e. s
protective earthing terminal of the EUT, with the earthing conductor switch "e" open.
0 H1 v5 D! K, Y# ]7 L6 S* t' eThe test is also conducted, on all equipment, with terminal A of the measuring network, H5 L) A$ b& p6 S7 q! k7 r
connected via measurement switch "s" to each unearthed or non-conductive accessible part7 }0 d8 Z5 f! n; t& H
and each unearthed accessible circuit, in turn, with the earthing conductor switch "e" closed
- \2 D, B2 Z- n. o- e这是标准上面说的,意思就是有地断地,没地接地~~* a3 o3 m7 t, i+ @7 U1 h
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) d- m+ F, b9 c, J9 W' b( x. T* _
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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