Reply To: BB60C, EMC measurements:How to lower the noise floor of my setup ?

Something is off with the replies in this forum. I edited my reply and it got deleted..

Thanks to both of you for replies!

Reply to Justin Crooks:
is the antenna the same distance as in your test site, or did you compensate readings for distance to DUT?
Antenna is 3m away from DUT in both cases – certified test lab and our lab.

Did you factor in any preamplifiers or cables used?
We do not use external preamplifiers so we did not have to factor them in. Regarding cables- yes, we added cable path loss table.

But can you tell why the noise floor is so high? And what result should we even expect in empty chamber? 30dbuV/m seems a lot.

Reply to kaiser:
So if I understand correctly you advise us to add a LNA to our setup right?
Can you give me one example of cheap LNA? I only found this one and it does not seem cheap to me :
https://www.aaronia-shop.com/products/breitband-vorverstaerker/hf-preamps/bypass-amplifier

I will do the test you described about ref level change and SNR.

Yes, I know we do not have anechoic chamber, we are gradually upgrading our chamber, but it should not affect the measurement if we are measuring empty chamber. We were surprised that we had 30dbuv/m noise floor in empty chamber.

BTW, we can even see the standing waves if we move the antenna 😀