标题: 求教:怎样确定温升测试时间? [打印本页] 作者: kelvinwen 时间: 2011-7-5 16:49 标题: 求教:怎样确定温升测试时间? 看了寒烟翠以下链接的文章后,真是受益颇多。只是对试验稳定条件建立时所对应的时间没有明确的定义。 $ k& D& V2 T# \0 z7 k5 zhttp://www.angui.org/read.php?tid=87400 D R- W7 Z. E8 N
在有些标准中有定义:" F) R. _1 ?; ?: ?8 f4 J
1.引用kuiyin001 \Hand-held appliances are operated for 20 min. ' _+ _ t# t9 R7 W; jOther appliances are operated until steady conditions are established.--60335-2-32 章节11.7 % O9 X9 Z5 q" S8 Z$ m( w - r% ]. b2 x$ R2.The temperature is considered to be stabilized when three successive readings, taken at intervals of 10 percent of the previously elapsed duration of the test but not less than 5 minutes indicate no change.---UL859 /37.1.10 C! e& R5 F+ Y5 @0 S2 r9 [
3.引用caballo3157! f- [8 C+ b) J, a: |7 D
IEC60598:0 {, k+ _8 G; y1 _- d% W2 b3 A0 H% u
12.4.1 f Measurements shall not be taken until the luminaire has stabilized thermally, i.e. temperatures are changing at a rate less than 1 °C per hour. " ~) }7 [1 G" p2 bUL1029: ! ?; i6 T: @# E' D21.1.6 A thermocouple-measured temperature is to be considered constant if three successive readings, taken at not less than 15-minute intervals, indicate no upward change. ! O9 O) @8 [1 b" W; wUL1278:- b+ V" v& Y! H8 T: t
39.1.8 To determine whether a heater complies with the requirement in 39.1.1, it is to be operated continuously until constant temperatures have been reached. A temperature is considered to be constant when three successive readings, taken at intervals of 10 percent of the previously elapsed duration of the test (but not less than 5-minute intervals), indicate no change.4 n* r6 s+ ~% e2 _9 b* O% V
4. 引用寒烟翠:所谓的稳定的意思是一个小时内温度上升不超过1度就可以停止测试,当然是指所有的点;不知是通标EN60335中哪个章节?5.UL1082第33.1.8条等等, ^: u( e8 k1 X
请各路高手多多指点及补充。作者: xcxgod_309 时间: 2011-7-5 19:06
在IEC 60335﹣1通标中没有针对试验的稳定状态作出详细的解释9 M9 T7 P0 i, K: Y
在一些特标中会规定出试验截至的状态8 }! C/ z& f2 q3 d1 P
但大多数都仅仅是说工作到稳定状态 I: I5 N6 i3 r8 _ F
个人认为. R8 f: t) B# v: v# _
稳定分两种,一种是达到一定限值后不再升高,另一种是动态的平衡(波动在一定范围内) : b% U, i5 g9 q0 }5 }# j& B) N" D针对第一种情况严格来说是要温升在一定时间内不超过一定值,比如一小时一度,但在实际操作起来非常困难,那么采用十分钟内上升不超过一度或两度,最后取值比实测温升高五度。9 h. R& ^4 k5 D5 m% v0 I
针对第二种情况要采取多周期测量,反复重复几次,会有一个周期是最高峰,取值就取最高峰的峰值 w8 L% V0 P5 ~0 I8 ^' ^
要是纯从标准来说我认为IEC体系与UL体系不能完全适用,标准不能针对所有器具进行规定 / \+ P6 M$ e! c拿电磁炉来说,电磁炉的11章标准中也没有考虑到太多情况,最后还是通过一些会议得到的一些结论作者: kelvinwen 时间: 2011-7-6 08:30
有没有哪个CTL提及怎样确定这个稳态?作者: 代文 时间: 2011-7-6 08:53
ul有具体说明,IEC60598也有具体说明每小时波动不超过1k