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|
|  DSH 3909 r# A7 A7 S6 C, r, [& M3 [9 |& i
) o! N! R( ~/ z# Q! `' T8 w r- K | Abnormal test
4 D, ~# }( P2 u5 J9 T% {& ~6 B; N9 x0 j | 5.4.6- M* _- h; O9 U# _2 K& Z
| 60950(ed.2);am1-am44 F* L; V" P# _$ q; h7 Q8 q
|
% T. ]( D2 O+ L5 w8 }- `, pStandard:
* Z( Y& m' ^5 b" I: i: R( CIEC 60950 (1991) 2nd ed., Amdts.1
! v# s9 _3 |; Q6 a6 [(1992), 2 (1993), 3 (1995), 4 (1996)
+ y1 O% {% w* z( c& g' s$ BSub clause:7 y5 o c- J0 e
5.4.6+ g( _0 }& |+ I- l
Sheet n. 390
, ]3 P- ^+ g! fPage 1(1)
9 c/ D* c0 A& [ ^' s( P' XSubject:
. M9 o8 |% {$ c7 r0 p' ~: rAbnormal test
8 W( @, ] o( j0 eKey words: _* D7 n& B. F- q. i- H
- Abnormal test
]2 Y& \( U) u) A. N4 S- Fault
/ P L, ~. B, O- t& m* O# HDecision confirmed
2 F7 ~$ A. U: E* V2 @/ Rat CTL 38th meeting
" R# U3 e; M# p7 M" ?6 h, L# WQuestion:
) Y/ Q0 r* `9 _7 e4 t: fIf a printed wiring board mains trace opens during the performance of the component abnormal
7 }, D, ]* g' l' s; [& ntest, should the test be terminated, should the trace be shorted and the test be continued until the0 Z9 W# {9 \4 i+ B: Q
ultimate results are obtained, or should the test be repeated a total of three times?5 y! o4 O+ W- l6 M
Decision:- O+ ?+ q: l( ]# Q' k, D
For primary circuits, the trace should be shorted and the test continued until the ultimate results" k+ P y1 z/ V/ ~
are obtained, additional short circuiting applied as required. For secondary circuits, where the+ u# D, d$ u5 S
trace is designed to be opened in a repeatable manner, a second option is for the test to be1 \6 d d5 r" }2 X- E
repeated three times to determine the circuit opens repeatedly.9 h# G, c* L G4 x
- C3 h- g) n% q* ^5 I& J% X; z
' q2 H5 d, u$ z$ c2 U |
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发表于 2012-11-6 17:11
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