DSH 566 Permissible temperature rise, exposed vacuum tubes and enclosures of

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 566 ) b- i4 J, E) B0 L# w; M 5 S; G+ }* L+ j% s1 l

Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ...

7.1.1, Table 3 9 U# d+ [& Z! V1 g$ J, z, k2 I

60065(ed.7) ! U8 I3 F  i2 P# J' U

Standard(s):
( v$ o& R: j3 K- C* Z! O0 ^IEC 60065, Ed. 7
3 g3 |' F# A: }) J) W, u4 `Sub clause(s):
" Q* T+ G8 n4 ?! c* L7.1.1
Table 3
Sheet:
DSH n. 566
% ^) I' o" B( U) f, _3 b: c- m/ pSubject:
Permissible temperature rise,
& O1 J, K" t( A* p6 Oexposed vacuum tubes and
5 W9 ^4 c/ r$ b, g  jenclosures of apparatus
containing vacuum tubes.
Key words:
- accessible parts
- vacuum tube
- maximum temperature
Decision approved
, L! ]+ C% X* |1 y) X, ~+ H! eduring the CTL Plenary
! W5 S/ Z) Z: b# d2 {" }Meeting 2006
) f) w& y0 l+ a; ?9 [- w0 @Question:
Will an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
tube be allowed to have a 65K temperature rise under normal operating conditions?
% U9 f+ o$ y" U& C. a( R# XDecision
- k( n, A/ C$ f) |+ UThe 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
vacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface
) @# [9 P' N3 D1 c& q& y  Q8 fdoes not incorporate any user switches or controls intended to be handled during normal use.
The 65K rise is applicable to
1) metallic apparatus enclosures,
4 i4 ]5 A6 M" d& G2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
3 E- \& i& m- N, K4 |and
3) ACCESSIBLE parts of vacuum tubes.
* L9 k& f1 Y: r" E. ^% qIt is also recommended that the user instructions advise the user to permit tubes to cool
2 d# r2 H* m! p7 ~0 R8 L3 Wbefore opening the access cover for service


- Q! y! f0 R! Y9 r1 ~