Dear experts, I have read EN 55022:2006 and I feel I don't understand Annex F.3. 1. It is about figure C.3 and it discusses how to do capacitive voltage probe to preserve TCM 150 +-20 ohm, but the method C.1.3 (figure C.3) don't call for 150 ohm so the whole F.3 seems to have no sense. 2. I suppose in second F.3 paragraph the 120 ohm is an error and 130 ohm were intended to be there. 3. That second paragraph I read: "To reduce 150 to 120(130) you add 5pF. After adding 5pF you get 148." - looks amazing. I know that these 148 is from about 147-j20. If that -j20 consumes the max TCM tolerance than writing about reducing 150 to 130 has no sense. 4. I'm not sure if -j20 consumes the max TCM tolerance because I suppose that 147-j20 will give measurement results much closer to 150 ohm than 130 as phase shift looks for me not important when measuring only voltage or current (in methods needing 150). It is out of subject in C.1.3 as 150 is not needed in C.1.3. 5. The note at the F.3 end says: "..., it is recommended to use the power measurement approach of C.1.5.". I have read carefully the whole C.1.5 flowchart (figure C.6) and I can't find the power measurement approach there. Can you comment these, please. Best Regards Piotr Galka MicroMade Poland -
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