fengxinzi 发表于 2013-10-7 18:02

一楼说的对,如果耐压测试通过不了,然后只要可以通过元器件短路测试是能接受的,但是电气间隙不够可以用UL8750 中50W功率点测试来评估。

jjlamshushushu 发表于 2013-10-15 14:37

Nezof 发表于 2013-9-27 14:40 static/image/common/back.gif
PCB上的距离不够可以通过裸板耐压来代替

带电件到可触及表面上的距离必须按照表的要求来了


裸板耐压不过的话,有50W测试来再验证------请问:这个50W测试如何进行的?

Nezof 发表于 2013-10-15 15:10

jjlamshushushu 发表于 2013-10-15 14:37 static/image/common/back.gif
裸板耐压不过的话,有50W测试来再验证------请问:这个50W测试如何进行的?

看来你都没有看完上面几楼的回帖,再回去看看

jjlamshushushu 发表于 2013-10-15 15:19

Nezof 发表于 2013-10-15 15:10 static/image/common/back.gif
看来你都没有看完上面几楼的回帖,再回去看看

所有回帖都看了,还是不明白UL8750的插图8.1关于50W试验是如何做测试的。请指点迷津,谢谢!

Nezof 发表于 2013-10-15 15:34

jjlamshushushu 发表于 2013-10-15 15:19 static/image/common/back.gif
所有回帖都看了,还是不明白UL8750的插图8.1关于50W试验是如何做测试的。请指点迷津,谢谢!

其实你可以看看UL 的DS的

Connect a wattmeter and an adjustable resistive load across the capacitor or semiconductor junction under test.The load resistor should be capable of handling at least 50 Watts and should be set for its maximum resistance at the start of the 'test'.
Close the knife switch on the protective device in the circuit.Then adjust the load resistor to cause a power dissipation of exactly 50 Watts as indicated by the meter.Open the knife switch across the protective device.If the protective device functions within 1 minute to reduce available power to less than 50 Watts, the point under test is considered not capable of delivering 50 Watts for one minute.Similarly, if a circuit component or components, open in less than 1 minute, or current is inherently limited to keep power below 50 Watts, the test point is considered as not capable of delivering 50 Watts for 1 minute.

jjlamshushushu 发表于 2013-10-15 15:36

Nezof 发表于 2013-10-15 15:34 static/image/common/back.gif
其实你可以看看UL 的DS的

Connect a wattmeter and an adjustable resistive load across the capacit ...

DS=describe ?

Nezof 发表于 2013-10-15 15:41

jjlamshushushu 发表于 2013-10-15 15:36 static/image/common/back.gif
DS=describe ?

datasheet

jjlamshushushu 发表于 2013-10-15 15:48

Nezof 发表于 2013-10-15 15:41 static/image/common/back.gif
datasheet

你有相关的ULDADASHEET 吗?

Nezof 发表于 2013-10-15 15:52

jjlamshushushu 发表于 2013-10-15 15:48 static/image/common/back.gif
你有相关的ULDADASHEET 吗?

你有ul myhome账号的话,可以自己去下载你们公司做过的认证下的datasheet
如果你们没做过ul认证的话,我就爱莫能助了

jjlamshushushu 发表于 2013-10-15 16:25

Nezof 发表于 2013-10-15 15:52 static/image/common/back.gif
你有ul myhome账号的话,可以自己去下载你们公司做过的认证下的datasheet
如果你们没做过ul认证的话,我 ...

我有ul myhome账号,但我公司目前没做过相关的UL认证
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查看完整版本: UL 1993中,电气间隙不足时,是否可通过裸板耐压来豁免。