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 7 j6 l* T8 ]* i6 d" n7 F

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

7.1.1, Table 3

60065(ed.7) 6 N0 b/ ?* _. }5 `; O' Y

Standard(s):
IEC 60065, Ed. 7
Sub clause(s):
7.1.1
Table 3
; a& p0 B# I$ S; DSheet:
DSH n. 566
) e! x! ^' C. m. a; P0 JSubject:
Permissible temperature rise,
exposed vacuum tubes and
  V2 [8 J2 h, zenclosures of apparatus
containing vacuum tubes.
4 _$ S7 F+ J% Q, iKey words:
8 ]+ d: A3 A/ j/ Q, |- accessible parts
- vacuum tube
- maximum temperature
Decision approved
5 X: H2 {( o! S- n) I/ Uduring the CTL Plenary
Meeting 2006
Question:
) x$ P, S2 k9 c, [6 F9 ZWill 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?
  c6 n  q; j5 a8 F  oDecision
The 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
2 X4 l& ]2 S& t% p1 k" Ydoes not incorporate any user switches or controls intended to be handled during normal use.
; W# a1 e7 o- I% M6 Y: ]  _The 65K rise is applicable to
9 p* m7 X' k8 m0 U1) metallic apparatus enclosures,
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
9 T/ V2 |( I& T& ~3 ]0 ^* \( a  nand
( w0 a8 g1 h) e0 K. ?9 e3) ACCESSIBLE parts of vacuum tubes.
/ Z3 p4 \3 v* k1 }2 U2 H5 `, X, A/ W5 cIt is also recommended that the user instructions advise the user to permit tubes to cool
before opening the access cover for service
, w% ~% b% D0 w9 f. @; C