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|  DSH 390
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7 ?: u! m: c* j% } | Abnormal test! Z3 w5 v5 N3 n5 @) N
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+ l+ o1 F6 a* \ L3 z/ k | 60950(ed.2);am1-am46 a. A2 y, m' v' m
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Standard:1 J) c" L; A9 l6 X
IEC 60950 (1991) 2nd ed., Amdts.1: x3 l9 |1 f- g6 ~0 W
(1992), 2 (1993), 3 (1995), 4 (1996)1 s- A1 U* e! |" e! G9 p# X
Sub clause:) \4 J6 p' d0 X/ h& l
5.4.6
( y& c- K7 \3 ]Sheet n. 390* | F7 g9 F, p% A+ [% n. p! r
Page 1(1)
* q* M; j/ R2 u7 ^3 Z5 u) [7 {Subject:3 Z2 K# Z2 t5 K) q$ o, m1 f5 Q+ p$ `
Abnormal test0 w- y0 W" o+ s
Key words:/ V' _5 n D- i, ?; p
- Abnormal test0 U) Y$ H7 y3 Q6 |
- Fault
7 g0 u- c; K1 ^Decision confirmed; s6 w$ N9 x* v1 D1 A- V
at CTL 38th meeting, j$ t/ @. w" D8 H+ ^
Question:
4 g2 N5 L% Q. JIf a printed wiring board mains trace opens during the performance of the component abnormal& c2 w7 A9 f T' i
test, should the test be terminated, should the trace be shorted and the test be continued until the- n! {- s& p2 Q, I6 y0 Z, I# W% h
ultimate results are obtained, or should the test be repeated a total of three times?5 e5 z5 g, W2 Y9 F7 W9 d# T# e& _
Decision:% C. \3 O# w. P' a# E
For primary circuits, the trace should be shorted and the test continued until the ultimate results
/ M! \- D3 s' J0 |' e1 lare obtained, additional short circuiting applied as required. For secondary circuits, where the
* X1 q( ~: x9 ~" g; Ntrace is designed to be opened in a repeatable manner, a second option is for the test to be
3 M/ q7 c n1 S' ^repeated three times to determine the circuit opens repeatedly.
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