Near field probe measurement

[Remy Hurx]

Hi Min/Robert,

Hopefully I don't ask something very stupid... but I just bought a DSA815 to get some grip on EMI on my boards and also for the fun of learning. I know near field measurement is only an indication of E/H fields and a measured apparent higher (less negative) dB signal is not always a sign of something bad happening. But can we say for signals with a specific +x dB (compared to 'normal' ) the likelihood of it being a bad sign is high in case of a specific height Y above the PCB?

gr Rémy

[Mach One Design]

Hi Remy,

Great to see you here. Well, it is not a stupid question at all. I would guide you to this article. See http://emccompliance.co.uk/wp-conten...gic-Loop-3.pdf , section 4. and https://www.ramayes.com/Data%20Files...st_Methods.pdf

[Remy Hurx]

Hi Min,

thank you very much! It’s clear to me now

Both articles are very interesting.