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|  DSH 390! _& p2 O* D. ^" N$ ^/ Y
- B; O" [& |3 _ | Abnormal test1 ^7 X3 e3 \- R. d7 e% v
| 5.4.65 F9 X$ R. y' V2 P; @, L" i
| 60950(ed.2);am1-am4: x* Y M; A. }6 q+ m, b
|
7 R; a9 m7 L/ u& J/ @' L# H/ B
Standard:
/ j1 x6 y' h1 U% H& g0 zIEC 60950 (1991) 2nd ed., Amdts.1
- U. ^2 l8 S2 c+ Z. e) R(1992), 2 (1993), 3 (1995), 4 (1996)# e" l8 I4 c& H8 ^
Sub clause:! H. O3 ]; R" [) c
5.4.6
, [8 r2 ?; P% X7 o( Y6 b4 i0 ESheet n. 390
! I5 O7 X2 }. S' g( QPage 1(1)
& I, L/ Q1 |/ M3 Y. [Subject:
8 b P: M K9 _" l+ FAbnormal test
# ?5 F/ G4 p1 B a0 bKey words:: y' a) c+ o& [2 j
- Abnormal test
% O' k2 Y4 [: ]+ M- Fault/ N" U$ M% v' N- ~, u4 O$ f( Y
Decision confirmed
! n' j9 `( d" c& Aat CTL 38th meeting6 d6 D) F7 ]1 G
Question:4 M4 k6 G$ g! @+ b1 M& G- z
If a printed wiring board mains trace opens during the performance of the component abnormal1 K) r0 f' s$ S8 r* ^. `* @
test, should the test be terminated, should the trace be shorted and the test be continued until the
2 X9 H+ P1 [! [$ P4 tultimate results are obtained, or should the test be repeated a total of three times?
( Y+ B' N A0 zDecision:: ~ a7 I# J& a% M" s( |- R0 k
For primary circuits, the trace should be shorted and the test continued until the ultimate results
- O% i, P& `7 t6 care obtained, additional short circuiting applied as required. For secondary circuits, where the' S' z/ w7 p3 o c) t. h. x3 c
trace is designed to be opened in a repeatable manner, a second option is for the test to be9 j2 h& i- c: ?+ w; v) ^! z
repeated three times to determine the circuit opens repeatedly.3 I$ Q. x7 q d8 N( s
; U# O G$ k9 A7 U% q& d$ K# q
) S# ~( N. f; c# }0 c1 r1 N |
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