DSH 390 Abnormal test

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DSH 390 + D6 i) Q8 t  K9 ]6 k8 N0 ?, B

Abnormal test

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60950(ed.2);am1-am4 ' y7 W. ?7 K9 b4 t* c6 X

Standard:
IEC 60950 (1991) 2nd ed., Amdts.1
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- L' e' a) E5 A# j" VSheet n. 390
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) a, O) d( O, E" XSubject:
1 M& ]( L7 X& h' F3 Y' i* XAbnormal test
  t# d4 Q! ?" j+ h; C( p3 G9 nKey words:
- Abnormal test
% ~3 }: d0 y. \" Z1 ?5 i1 I$ V- Fault
Decision confirmed
7 K1 h  V  o7 D5 M& R1 c# nat CTL 38th meeting
  I- L4 F% U8 w$ T0 o( z/ C: ^! NQuestion:
If a printed wiring board mains trace opens during the performance of the component abnormal
! u) [1 l! }5 t& G6 o" d' ntest, should the test be terminated, should the trace be shorted and the test be continued until the
ultimate results are obtained, or should the test be repeated a total of three times?
4 ], f3 Q: }3 h3 e- m# W1 r. UDecision:
9 N5 _/ m  y7 V$ ~; IFor primary circuits, the trace should be shorted and the test continued until the ultimate results
: d1 |; a# C+ Zare obtained, additional short circuiting applied as required. For secondary circuits, where the
1 i9 h9 T5 W8 D% p( Qtrace is designed to be opened in a repeatable manner, a second option is for the test to be
repeated three times to determine the circuit opens repeatedly.
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