I’m confused (again)
Is it legally mandated by either the FCC or the EMC directives for
a component switched mode power supply be tested for EMC compliance as a stand
alone unit?
The end use equipment into which the supply is mounted has a large
effect on the power supplies ability to comply because of actual power load,
system impedances, and clocks etc. Most suppliers do test, but with a fixed
resistive load etc. While a good thing it really only provides a first level
of screening for the end user that the manufacturer has put some effort into
insuring that the power supply will likely be successful in most end use
applications.
A smps might have a CE mark but really only addressing the safety
implications of the supply and wouldn’t necessarily indicate any information
about EMC performance, correct?
To keep the story short the vendor I’m looking at really has an
seemingly contradictory set of EMC/Safety callouts sometime claiming EMC
compliance and sometimes not. They are a really solid but relatively new
supplier so I think they are mostly just confused, but it lead me once again
question what drives them to do any EMC testing – law or internal policies.
Thanks
Gary
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