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[MED] DSH 399 Component impedance

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发表于 2012-11-5 11:51 | 显示全部楼层 |阅读模式
广东安规检测
有限公司提供:
DSH 399- ]5 R2 c% ^! \
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Component impedance. ~% ~( H, g/ h5 W& d2 R
17a) and 17g)! @" `5 w& V. _; ]0 Q6 w
60601-1(ed.2);am1;am2$ y7 ]5 x( o' {# n
9 m4 P0 O: U6 Z
Standard(s)- (year and edition):
6 ?$ ]; i$ \& ]1 i6 i* YIEC 60601-1:1988 Ed.2 Am1+Am2
. E8 L5 d2 m( B0 n1 Q7 gSub clause(s): 17 a) and 17 g)* e4 W2 |) Z" ?) N! d
Sheet n°: DSH-399
( S- N( w- f! e- v/ q: w2 }Subject: Component impedance
; l; K' Q( p( q7 _' cKey words: Component impedance, high integrity& s8 g$ i% u  l# R$ L1 h
Confirmed by CTL at its 39th meeting, in Cologne, p6 u5 P  p2 D9 `
Question:
9 G7 P  ]4 c/ q+ y  a$ LComponent impedance is generally unreliable. Components certified to IEC 60384-14 etc. can% S: b7 t% r) r" a2 H& D4 U+ g
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
! F3 H% ]" G9 j# o# w. J1 |' Mof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such! E+ s+ S+ p9 g# B6 I) ]
a component? Does this sub-clause mean that further component review is not required?
4 f: X0 ~& T" v  |, z3 d5 F% ^Decision:
, Q6 s" ~1 H8 ^2 d" R" h6 w* ]Secondary circuits providing protective means after short-circuiting of inadequate AIR! v9 j% W# n- Y" n7 q
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
0 z( ]- y2 w. R7 p( bthese circuits shall be investigated as a SINGLE FAULT CONDITION
5 @  E* Y# j: L' s9 T* A6 L# i: c
' I& ?/ C) ~$ m- y: s$ F. H& }2 U% I9 P

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