安规网

标题: DSH 566 Permissible temperature rise, exposed vacuum tubes and enclosures of [打印本页]
作者: 小米    时间: 2012-11-8 17:24
标题: DSH 566 Permissible temperature rise, exposed vacuum tubes and enclosures of
DSH 566
0 T) e: R- j" k% e5 P' `7 Q6 D) C* _4 n
Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ...1 ~6 z9 f+ [$ t# \$ s& v
7.1.1, Table 3
" x$ ?( V( @, Y1 c5 l		60065(ed.7)1 G  v+ A9 A! Y  e
3 N) i+ ]  B/ [" j- E6 s
Standard(s):
, N% G6 Y! n( x$ @( b) l5 oIEC 60065, Ed. 7
# |8 X  j" `* X7 j0 |0 mSub clause(s):
, V& Z6 u! D3 R; F8 H# f! p4 y7.1.1
5 @/ o) g7 A0 c9 e0 PTable 32 W, i+ v2 k3 I- [
Sheet:
, |" y+ c0 z% z6 c1 r( `- mDSH n. 566) j2 F0 `& i7 q# K2 f2 w( d
Subject:" ~# K7 Y. K* d' v
Permissible temperature rise,
' `, J% z( s" t( h3 cexposed vacuum tubes and1 B& n1 o. a' @' X( m
enclosures of apparatus9 g8 i; e8 a! g. W
containing vacuum tubes.
7 X' j' Z- ?, C0 F6 m+ |Key words:
, k. j0 q& Q- c  H0 ^* U* m- accessible parts
' ?1 h) q5 f, h5 T! |5 @- vacuum tube
% r5 K8 n4 [3 B9 x+ F% N- maximum temperature
0 D8 U: M9 W- j/ PDecision approved
6 C1 j# ^! ^  ]& uduring the CTL Plenary( i3 O6 ]# G, K9 A# j+ P7 G
Meeting 2006, O4 Z6 v3 T9 G$ H# F$ e$ W
Question:
* `: _: I. s7 T( A  K0 WWill an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
) S0 `, w% k0 r* Rtube be allowed to have a 65K temperature rise under normal operating conditions?
# K% S& f# l! M6 l! r* VDecision
3 _! o: b' J% J' `) F3 O- `* k1 G0 p# EThe 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over1 K. n6 A% K* q5 |& k
vacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface
3 n  f9 c; @' W3 K9 J+ P, s: jdoes not incorporate any user switches or controls intended to be handled during normal use.
$ N2 v$ @! q/ B( C6 CThe 65K rise is applicable to
) O, J( Q. I  C/ Q$ h  J/ v1) metallic apparatus enclosures,
; B, V, g% O& m% j  h2) non-metallic apparatus enclosures taking into account Table 3 Note (c),* ~8 N& |) s5 O
and
- M5 h0 `. G. K8 c2 `( K* p# D7 c3) ACCESSIBLE parts of vacuum tubes.
$ L% L, }. B& K+ _It is also recommended that the user instructions advise the user to permit tubes to cool
: H" A5 @- h$ I& l  z9 zbefore opening the access cover for service
" K7 J4 `0 k. H1 D" _; ]
" r* v3 x" x5 n/ {6 `1 v; N- X( l1 Q3 Y  t[attach]77286[/attach]( q5 ]) f. u2 m1 c* U; z& d! `" }




欢迎光临 安规网 (http://bbs2.angui.org/) Powered by Discuz! X3.2