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Hello Mike and Rainer,

Gentlemen, I suggest you search this group with terms like "EMI testing" as this has been discussed at great length previously.

But the long and the short of this is that EMI/EMC Testing is an incredibly complicated subject.
If your product is powered by the mains, there are also Conducted Emission tests that require additional specialised equipment such as a LISN. Look it up:-)
There have been some very good links to some excellent tutorials and references on the subject also in this group.

The best thing is to get your product pre-compliance tested by a registered Test Lab and use their report as your reference.
Pre-compliance testing costs a lot less than a full Compliance Test.
Note where your product fails and by how much.
Then set up your DUT (Device Under Test) in your own lab and do your own testing.
Note the levels you measure at the failure points noted in the Test Lab report and these become YOUR test reference levels.
Then modify your design and aim to reduce your failure points by the amount the Test Lab result notes plus at least a 6dB margin, preferably a 10dB margin.
When you think your product is right, take it back to the Test Lab and have another pre-compliance test done.
Repeat this cycle until the pre-compliance test results all pass. Then you can get your Test Lab to do a full Certification Test.

NOTE: You can NOT certify your own products unless you are a registered Test Lab and you would not be asking these questions if you were:-)

It is vital that you understand the complexities of ensuring you duplicate your test setup on every subsequent test you do.
Photographs of your test setup are your best friend.
You need to ensure your DUT, every piece of test equipment and every cable is in exactly the same position each time and that every piece of electronic equipment in or near your lab is in the same on or off condition. This includes any type of lighting other than basic filament lamps.
Preferably turn off and unplug any piece of electronic equipment not required for the testing. As a minimum, unplug any unnecessary electronic stuff, microwave ovens, printers, desktop computers, TVs, etc that are on the same power circuit as your lab as even when these things are "off", they can often have some degree of electronics running that can contaminate your test results. And mobile phones are a definite no-no!

The TinySA is a great tool and can save you a lot of money if used correctly with appropriate accessories like antennas and E and H field probes to develop your product.
But as noted earlier, you can not certify your own equipment.

So welcome to the wonderful world of EMI/EMC Testing. It is a fascinating and at times, very frustrating, area of product development. (Been there, done that!)

Enjoy your research!

HTH...Bob VK2ZRE