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|  DSH 566& F+ d6 l' ^! B
5 ~) B3 C3 G$ y | Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ...
6 Z% S5 O" Y2 {1 M | 7.1.1, Table 3
& a9 ]" e+ I1 |6 g | 60065(ed.7)" D( n# J) u! \) I7 ?
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# v, x1 Z( t& KStandard(s):
! @# J# h' y x% IIEC 60065, Ed. 7
9 P% r; A, S( N7 ESub clause(s):" N. X3 F& t% J9 p4 g
7.1.19 e9 K& M$ K0 _0 ^
Table 3' M7 |2 K" |, i A9 \6 K7 b8 Z
Sheet:1 b6 s, |& ]; ?7 G2 W
DSH n. 5664 F( D# C y2 x% m
Subject:
5 _7 p& T; {9 l7 o2 U2 |; m/ FPermissible temperature rise,! ?, X5 n: P2 ? |& a
exposed vacuum tubes and$ h* u/ J5 S, G/ Q( |4 D
enclosures of apparatus5 ~& \7 P* E% p7 l* x* T
containing vacuum tubes.& ^3 [% p2 S: U$ Y* {- F
Key words:
% D0 V% j4 Y; W! X" F8 O- accessible parts
# M4 w4 G$ Y- m- vacuum tube
* B6 ]; U+ M! _+ e0 T& A1 q- maximum temperature
4 C( ?+ M7 }8 _0 dDecision approved9 f! C" I: w7 t7 w2 q- E) v
during the CTL Plenary0 E2 s- g2 ?2 _; Q6 X
Meeting 20069 ?( c: G; j3 ], P3 Y
Question:( G; m: v' l2 U
Will an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
5 e* L0 v5 F5 R! Q2 B1 j( @tube be allowed to have a 65K temperature rise under normal operating conditions?4 ~% c6 W$ \4 h' V& J5 d2 F5 }8 a
Decision
. s1 G9 m% j1 w1 J/ `! QThe 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
7 O z3 J! a, ]% c, bvacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface) d' F6 {, N- @" G
does not incorporate any user switches or controls intended to be handled during normal use.6 @0 |* n# U7 K
The 65K rise is applicable to0 j) F+ g; e5 O8 }
1) metallic apparatus enclosures,; L* L) ^. F1 w! Q, E) i- b
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
: [6 L# j2 L- M# q7 I; Eand: H0 H( M9 F7 Y; L4 K% F
3) ACCESSIBLE parts of vacuum tubes.* s2 i! T. P, \4 R9 K+ l, v
It is also recommended that the user instructions advise the user to permit tubes to cool* e' u! h3 g4 q+ Z) v7 l
before opening the access cover for service
+ [, `8 V, h7 a3 f1 j3 |+ M3 p9 Z9 Z8 y: i, U& C/ [$ R
' N6 n7 a* A) X# S- V; m- m2 n
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发表于 2012-11-8 17:24
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