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|
|  DSH 390" l. y" {" b! R* E4 ^. E
6 X- X' }# } M* o% Y' X+ G: n
| Abnormal test, e; Y( U. Y1 i Y' G1 R% Z3 @* ?
| 5.4.6
- d# D9 r0 |. s3 Q+ x; C, [ | 60950(ed.2);am1-am4" Q# p# E4 J% X7 D' a7 ^ l: P
|
0 O d( A5 q7 r2 L; x7 d
Standard:) m' d! c* s, a0 H5 B
IEC 60950 (1991) 2nd ed., Amdts.1 }' ^! H+ x0 u: d6 a$ f% Q
(1992), 2 (1993), 3 (1995), 4 (1996)" H3 z6 l/ e) x' V: k: ?5 ~! F
Sub clause:
( b4 N; d' X' {; T6 ~2 L6 i5.4.6
$ H5 C) t3 D4 y) O9 zSheet n. 390, `/ f: h5 h% [: ?3 `% [5 j
Page 1(1)
& s: b0 c+ D$ f9 ^6 I( ISubject:
8 P. [( i% O0 e1 \" @: VAbnormal test
, d( J* G5 I$ t. B/ J8 X% CKey words:
" [! p) r/ A+ ] h4 `% o- Abnormal test/ T' |4 j b0 i; n
- Fault. _1 v" @3 ]6 C1 Y) B8 Y( J- y
Decision confirmed
8 F6 e& l5 @- n1 e2 hat CTL 38th meeting) Z7 e$ V Z9 q, a* h/ F* G" Z
Question:
3 V% g: Q5 ~/ \/ AIf a printed wiring board mains trace opens during the performance of the component abnormal
: U- ]5 S! r+ F. Y2 w! H/ Ytest, should the test be terminated, should the trace be shorted and the test be continued until the& {9 H o% {. L7 N; b3 z: |, s
ultimate results are obtained, or should the test be repeated a total of three times?- {3 k4 z; j2 p5 y
Decision:; d5 _9 S4 o; Y1 T6 y
For primary circuits, the trace should be shorted and the test continued until the ultimate results S% ]: [+ q5 U2 x/ t+ o# k
are obtained, additional short circuiting applied as required. For secondary circuits, where the
4 `; Z% v& R7 G4 C) j: ntrace is designed to be opened in a repeatable manner, a second option is for the test to be- q/ W q) s E" v
repeated three times to determine the circuit opens repeatedly., D# p: F7 y& J+ @
! [6 J* F" |7 K
7 O! i1 }' F' y' I" ~
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发表于 2012-11-6 17:11
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