DSH 390 Abnormal test

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DSH 390

Abnormal test / E! z9 u8 H' Z0 I

5.4.6 3 P; v4 t8 X8 ~7 `- r5 ^

60950(ed.2);am1-am4

0 V" v( `3 P6 f8 G3 D3 rStandard:
IEC 60950 (1991) 2nd ed., Amdts.1
( w$ }4 H: |1 E. ?(1992), 2 (1993), 3 (1995), 4 (1996)
6 p6 H1 E' x, M" r5 _/ ?Sub clause:
: C* h9 w8 Q9 Q- ?6 Z# i& C5.4.6
6 n4 e5 U2 e* \, u: dSheet n. 390
Page 1(1)
1 B- m$ e4 o/ O/ O+ m' USubject:
& |. z5 `& h  A" _: o! w( }Abnormal test
- H5 W3 T7 j5 D0 G$ RKey words:
% ^: R7 |4 g4 n3 Y& B" r- Abnormal test
- Fault
Decision confirmed
at CTL 38th meeting
Question:
$ V$ d6 _, }1 t- i% w3 U5 KIf a printed wiring board mains trace opens during the performance of the component abnormal
- c) u& Z% [$ O; y4 h4 ]& Ytest, should the test be terminated, should the trace be shorted and the test be continued until the
0 l( A0 C% M* p2 r/ G/ c- Cultimate results are obtained, or should the test be repeated a total of three times?
6 V+ x, z# X9 {  n$ w# oDecision:
7 Z$ D' e4 F( _For primary circuits, the trace should be shorted and the test continued until the ultimate results
are obtained, additional short circuiting applied as required. For secondary circuits, where the
0 y8 ?" h) h& V( [trace is designed to be opened in a repeatable manner, a second option is for the test to be
  k2 b% l" H( |$ ?6 h- _. {repeated three times to determine the circuit opens repeatedly.
' K- m+ {" d" q' G; u4 E; l