wwwabcd 发表于 2012-9-3 10:14

测试角所用的热点偶是否必须是直径不超过0.3毫米的?


测试角所用的热点偶是否必须是直径不超过0.3毫米的?

zyhua1985 发表于 2012-9-4 20:22

11.8 During the test, the temperature rises are monitored continuously and shall not exceed
the values shown in Table 3. The temperature rise limit for metal applies to parts having a
metal coating at least 0,1 mm thick and to metal parts having a plastic coating less than
0,3 mm thick.

zyhua1985 发表于 2012-9-4 20:24

11.3 Temperature rises, other than those of windings, are determined by means of fine-wire
thermocouples positioned so that they have minimum effect on the temperature of the part
under test.
NOTE 1 Thermocouples having wires with a diameter not exceeding 0,3 mm are considered to be fine-wire
thermocouples.

332783568 发表于 2012-9-4 20:33

家电:11.3 除绕组温升外,温升都是由埋置细丝电偶的方法来确定,以使其对被检部件的温度影响最小。
注1:认为线径不超过0.3mm的热电偶,是细丝热电偶。
灯具:附录K,应能顺利穿过0.3mm的孔。

wwwabcd 发表于 2012-9-5 07:32


测试角的温度是通过焊在热电偶上的铜片测量的,铜片的尺寸远远超过了热电偶的
尺寸,还有必要使用很细的热电偶来消除可能引起的误差吗?

luckyfch 发表于 2012-9-5 09:52

还是需要细丝热电偶的

willing 发表于 2012-9-5 10:24

按11.3, 即使用了铜片, 也是要用细丝热电偶. 但一般工厂都直接用细丝热电偶贴在测温点, 不知试验室是否也这样做的?
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