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发表于 2013-10-12 10:14
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我在旧版的标准中有看到不同的描述:7 v$ y% _, ~$ Q- e. I- q. g) Y
2.10.5.3 Printed boards
* ^, Z! s! z0 i4 Y7 g# \9 R; jFor the inner layers of multi-layer boards, the distance between two adjacent tracks on the same
+ X) W" Q3 m3 J4 {# flayer of a printed board is treated as distance through insulation (see 2.10.5.1).6 P, |4 r8 ^$ ~, Z
( t5 S# {, v0 K G4 J! O内层距离当成是绝缘穿透距离。+ M# ?; @0 S. y! U
: w, f' `5 h! u& y+ B2 Q4 J但新标准已经对这部分做了修改,改为
/ s q1 H7 W; F) ^7 A# s2.10.6.3 Insulation between conductors on the same inner surface of a printed board- b0 U7 z0 T. T$ b
On an inner surface of a multi-layer printed board (see Figure F.16), the path between any two* @( n" ], b, `9 E: M: W- }
conductors shall comply with the requirements for a cemented joint in 2.10.5.5! K; j9 ^+ h/ S2 y: c5 j/ n9 V6 T" Y
2.10.5.5 Cemented joints
% C* x4 H: v+ n, h( s7 x$ xWhere the path between conductive parts is filled with insulating compound, and the insulating) C: D5 _/ k0 i- B# i
compound forms a cemented joint between two non-conductive parts (see Figure F.18) or
- i! N' _- W7 R/ H5 z" O& B( A2 xbetween a non-conductive part and itself (see Figures F.16 and F.17), one of the following, a),- X; Y8 c; u7 S" p* {3 V
b) or c) applies.
/ S E/ T2 A& P7 Ba) The distance along the path between the two conductive parts shall not be less, u" t. A! y, i! a3 G
than the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 2. The& K5 n; F) q$ Z; F
requirements for distance through insulation of 2.10.5.2 do not apply along the joint.b) The distance along the path between the two conductive parts shall not be less
0 P: Y5 `4 e! U Y% Vthan the minimum CLEARANCES and CREEPAGE DISTANCES for Pollution Degree 1.. H; y/ u9 d7 B o' l
Additionally, one sample shall pass the test of 2.10.10. The requirements for distance
" ?+ Q9 [, v$ Xthrough insulation of 2.10.5.2 do not apply along the joint./ P" |* F' J- T& `+ v/ R
c) The requirements for distance through insulation of 2.10.5.2 apply between the
( v3 | p$ [+ Fconductive parts along the joint. Additionally, three samples shall pass the test of
+ T/ e- ^ ]9 N, H3 [' S
1 Z* k- f% M0 p: A$ z# J我们公司一般应用的是2.10.5.5中的a),
2 l. y- W* k0 X/ e1 x7 g所以在新的标准里,内层的距离和外层的绝缘距离是相同的。' R# @' R% R% ]3 B/ j; [
2 a( P0 P' A r: u5 z9 U2 E
请高手指教,我的理解是否正确。 |
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