It was about five years ago, I did an EMC job to meet the CE mark requirement for a Semiconductor equipment manufacturer by the approach of TCF (Technical Construction File). The whole system was real giant and there was no way to bring the system to the lab fitting in the chamber. Many sub-systems were OEM parts and most of them had been CE marked. However, during the site testing at customer's premises, a walky-talky made the system shut-down. It was quite straight-forward to find the cause of the failure and that was the CE marked UPS system. When we looked at the detail information of the CE Marked UPS system, it was truely CE marked, however the test report shows that this UPS system is a Class B device and that manufacturer declared CE compliance at Class B. Nobody was wrong, but the Semiconductor system must meet Class A environment. The advice to the semicondutor equipment manufacturer was to either fix the UPS immunity problem or change another UPS system. So CE marked - what does that mean? It is a manufacturer's self declaration. As a result of this when you shop around for CE marked sub-systems or OEM parts, make sure that CE mark is what you want. Regards, Leslie
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