安规问题集锦:
1、标志不当:
a.fuse marking
b.power swITch symbol
c.protective earth symbol
d.PE wire color
2.安全说明:
a.Motltipower supply system
b.protective earth connection instruction
c.High touch current warning label
d.Hazardous voltage
3.绝缘距离:
a.10N force requirement for all parts
b.misunderstand bulk capacitor's insulation specifications
c.Ill assembly
d.misunderstand fan wire's insulation feature
e.transformer construction fail: margin tape width and turns of insulation tape
4.资料和元器件:
a.certificate out of validity
b.misuse component certificate: UL and European standards different
c.miss safety critical components in CDF: discharge resistors and bulk capacitor
d.misunderstand the requirements for safety critical components: not all safety critical components need certificate
e.misunderstand components
5.安规测试:
a.Hi-pot fail, especially after 48hours' humidity treatment
b.Touch current fail
c.Output overload fail: temp. exceeded safety limit
d.Component fault simulation: temp.on transformer and output voltage exceeded safety limit
6.设计更改和生产一致性:
a. Non-conformance between certification and production
b. Label format
7.PCB Layout图提供不对,只提供了器件装配图,没有走线图。