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。% `5 N0 J0 Q- v i& t5 t, I5 r http://www.angui.org/read.php?tid=8740 1 e( |& r! u4 ~- x( H s% j/ L在有些标准中有定义： ' Y% T$ d; g- D8 l6 d" ?# j1.引用kuiyin001 \Hand-held appliances are operated for 20 min.7 F$ b# [. D8 [ i1 s( N
Other appliances are operated until steady conditions are established.--60335－2－32 章节11.7 " F0 }9 @. U6 h' W0 m" @: C , J) d/ K. Y8 U$ {/ X# Y+ r) d2.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( ^# C7 \3 b+ Y/ G0 W6 p4 h. W2 N
3.引用caballo31571 r2 V# G" P0 F9 j
IEC60598:# X0 u3 ^8 Q$ v' O$ N
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. 3 ?+ V# w9 m; x2 b8 l% h- eUL1029: # A8 C! y; ?; S- D7 H0 r! u% G: C21.1.6 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., l1 [' P: }1 o+ G/ P5 q9 _
UL1278: 8 U, x- p$ k. T' i; d2 y" y39.1.8 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.3 q( {/ E1 P6 Y3 f2 o7 O7 g# E
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 " S0 X. Z) S1 s; j3 [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 " `8 m( d6 c8 i# G d在一些特标中会规定出试验截至的状态 $ f5 p% k9 P2 e x: [8 w L但大多数都仅仅是说工作到稳定状态 ' h4 O9 g! m, L. T: ?$ O个人认为 1 G2 z, L, x4 D# z. B. P6 y3 |8 j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） ! {2 T/ _6 @+ L3 N, E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。 - ^3 B( X! R \- H8 [3 m8 J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 ?$ A6 T4 H. L9 \* Q9 V7 K& R
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* ~7 z% }* ^' Z8 r7 ~
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