|
|
|  DSH 3900 x& [# q( @5 }. C$ p
7 {/ R2 l! Y, j4 d: Q% w6 u. z
| Abnormal test, R+ s/ b1 }) Q$ n0 S3 j; W9 p* |
| 5.4.6! B; D0 }" s# t6 A( o
| 60950(ed.2);am1-am4# Y2 p8 n. L0 n$ C5 ]1 E
|
0 N; d" e2 I3 A( p( Q4 ?Standard:1 G& \: d6 j) H% S0 f
IEC 60950 (1991) 2nd ed., Amdts.1( t! c( f6 j- W) }# K4 \6 w. ~
(1992), 2 (1993), 3 (1995), 4 (1996)
N) w: P& J* e3 P, V1 vSub clause:& B6 h& m) t ^/ ^7 K7 L2 M
5.4.6
. T b+ c; n) wSheet n. 390
Y- T, J# }, ~Page 1(1)
- G/ Z; s7 M; @, Q/ v$ R- YSubject:$ ^, C1 b- w% `
Abnormal test. \6 V, G$ F. v# x. G" \
Key words:
- j8 ^+ k4 F; M3 T5 ]( I6 o. n) R; o- Abnormal test; v; d! k& i# T6 O
- Fault
) {' ^# W. t EDecision confirmed/ N# P; k* n* M- X0 s! V
at CTL 38th meeting
w9 G9 c' w+ d+ U% j' d' I B' w( j$ RQuestion:
" T' X- w2 c/ @) J1 l5 t* c& Z( yIf a printed wiring board mains trace opens during the performance of the component abnormal
* m: Q) O1 ~8 c% Y6 F" gtest, should the test be terminated, should the trace be shorted and the test be continued until the6 V* F) ~! @5 z$ i5 h" U
ultimate results are obtained, or should the test be repeated a total of three times? Y+ \( A8 w/ u8 H4 ?
Decision:
$ m; }- c: \9 t! LFor primary circuits, the trace should be shorted and the test continued until the ultimate results
2 A2 j2 h6 p! H+ w% l# yare obtained, additional short circuiting applied as required. For secondary circuits, where the6 h# r+ E1 N( [! @! P' H" U
trace is designed to be opened in a repeatable manner, a second option is for the test to be& g! j$ q" l" }9 |5 A0 E$ k& Y
repeated three times to determine the circuit opens repeatedly.
X2 Q. u2 V5 u, T/ V
* }' J2 U+ u g( G5 Q+ H
7 |6 \. x7 p9 f9 G' a0 u5 \* _ |
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