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|  DSH 566
) V$ A% c+ M4 J+ B7 k0 x; f0 m' }) }, S K/ ?& B
| Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ...
# @+ V1 z8 R+ h5 U, b | 7.1.1, Table 3# z) _% R8 X/ Y0 m6 @
| 60065(ed.7)
6 u2 C: Z# a$ Q |
9 k' Q" T. F3 p5 [ u- YStandard(s):
% Q; i- W0 G, hIEC 60065, Ed. 77 u5 v6 B3 y3 K7 I# d
Sub clause(s):# Y- T- W4 f' X" u6 G* B
7.1.14 u- L5 [% W; `) j+ J+ [ S) P
Table 35 h# E* b' e6 I+ r
Sheet:. w' m# e# ^7 K8 X6 t+ F) R# D
DSH n. 566
& I/ K2 J5 o' `- e- @1 wSubject:
2 J, b. d6 D) K4 g0 N: X. f fPermissible temperature rise,: |$ N9 w- f( }: o1 r7 K
exposed vacuum tubes and$ K N8 ^. I# _9 W3 I' r
enclosures of apparatus5 Q1 q& L7 W2 c& p3 _. |
containing vacuum tubes.
' f. [/ O9 O" b0 T: I- _* qKey words:) X0 I6 _9 d1 v" e6 F# ]
- accessible parts$ \( n8 J- W+ J" T4 x. q6 _( C
- vacuum tube4 s/ Z- e5 d+ m
- maximum temperature; B4 p) F8 x, T" @" Y
Decision approved
7 |5 f; e7 c! z+ _; h8 m* Dduring the CTL Plenary
9 N m, z+ u- f0 [" lMeeting 2006! G7 ~; t0 J# S4 E3 [& ^
Question:
# C8 W) m0 x" [' e4 kWill an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
' A# y- w$ W/ C9 utube be allowed to have a 65K temperature rise under normal operating conditions?
3 }$ Z# V9 j) u# T h9 ^( wDecision
: @+ D. i. J- N& r9 ?8 l6 i6 ^The 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
; \/ m/ V5 h' n* Ivacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface' }) l, w2 W4 N) M' y
does not incorporate any user switches or controls intended to be handled during normal use." ~4 g1 u6 m$ T0 p+ F# u
The 65K rise is applicable to/ e1 H/ ?( R9 m6 j
1) metallic apparatus enclosures,$ E: i/ W! F3 o0 U2 }# X! B
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),8 H3 s- o |: F, {: Z1 O* U
and8 W- }' B r3 N; J8 k6 g. ]! {: R$ x
3) ACCESSIBLE parts of vacuum tubes.
2 k; c$ `3 Q9 Q( n/ e* e5 PIt is also recommended that the user instructions advise the user to permit tubes to cool
! S% w' y6 o0 E2 t6 Y0 Lbefore opening the access cover for service: a; L8 s- p; Q3 r' D; I! t' f
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