Welcome to the wonderful world of CE marking.

Different results from different test houses are, I am lead to believe, to
be expected.
By immunity testing I presume you mean Electromagnetic Compatibility. There
are
also Electrical Safety Tests.

There are two basic routes you can follow.

The Technical Construction File - Here you assemble a file of documentary
evidence
that shows that the equipment cannot exceed the statutory limits.

Testing by a Third Party (or In-House). There are approved and un-approved
Testing Houses.
The tactic that we use is to 1. Do rough tests using very basic equipment to
verify that
                                  we haven't done anything stupid.
                             2. Use an un-approved house for better
standards of tests to
                                  show we have a good chance of passing the
tests, doing
                                  any necessary tweaking.
                             3. Use an Approved Testing House for
(hopefully) the
                                   one final test.


I have been on several courses run by York EMC Services and use them as the
Approved House
(they are an off-shoot of York University). They have several Test
Facilities in the UK.
I believe that they run courses in the USA
and may have set up some Test Facilities there.

Put "CE EMC York" into Google to throw up some useful links

If you have specific questions, I will try to help but I don't pretend to be
any
sort of an expert on this subject. I've just had to jump through the
hoops several times.

Regards

Chris Carr



> Does anyone on the flip side of one of the ponds have some down and dirty
> experience with CE immunity testing?  I've got 2 different labs doing the
> test 2 different ways, and of course only one passes.  I'm just not sure
> which is right, and the spec eludes both are correct!!!!!
>
> To cut to the chase, one lab is simply looking for distortion on our
> "wanted" signal.  The other lab is actually measuring the dB differential
> between our "wanted" and "unwanted" interfering signal.  I'm just looking
> for some practical guidance as to how the measurement should be made, and
> not sure who to call.
>
> Any help appreciated.
>
> Scott F. Touchton

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