Hello min. Your videos are rally very helpful. We are testing high power three phase ac equipments which has high voltage switching . We put some standard emi filters at the input of the LIsN to minimise the ambient noise. It seems to work. But do you think this is a good idea or can you suggest some alternative.
you can use a tent, or switch off nearby equipment. But sometimes it is hard, in one case, when I was visiting a client, there was a very strong ambient noise in the whole building, also very broadband, we could not simply use an antenna. I posted the question to all the EMC professionals I know, none of them has ever seen that kind of noise before, and they were all interested to know what caused it. Unfortunately it was a one-off visit, otherwise I would want to identify the noise source in that building.
Hi Min, thx for this video! It solves some problems which I encountered. But also raises some questions 😅: 1) instead of using the powercables with ferrites. Could we also use a coax/shielded cable? Maybe coax is not a good example because the gnd is not the shield. 2) same for the connection between the DUT/LISN. At the time you connected them the span was bigger. Could we also suspect noise from the environment coupling into the wire? I think usually the original powercord is used of the DUT? (If applicable) 3) I see ground is connected between the two LISN’s and I guess also the electronic load. If the DUT has a earth/gnd, also connect that one? 4) LISN is put in dBuV mode. Current probe in dBa. Should we also put H-field probes in dBa and E-field probes in dBuV?
Another great video Min. Your explanation of all things RF and Pre-Compliance is absolutely invaluable. Thank you.
Very clear explanation, thanks
Thanks for another great video. I appreciate your very clear explanations.
Hello min. Your videos are rally very helpful. We are testing high power three phase ac equipments which has high voltage switching . We put some standard emi filters at the input of the LIsN to minimise the ambient noise. It seems to work. But do you think this is a good idea or can you suggest some alternative.
What if my Spectrum analyzer keep picking stray noise all the time? How to bring the noise floor down to minimum?
you can use a tent, or switch off nearby equipment. But sometimes it is hard, in one case, when I was visiting a client, there was a very strong ambient noise in the whole building, also very broadband, we could not simply use an antenna. I posted the question to all the EMC professionals I know, none of them has ever seen that kind of noise before, and they were all interested to know what caused it. Unfortunately it was a one-off visit, otherwise I would want to identify the noise source in that building.
Hi Min, thx for this video! It solves some problems which I encountered. But also raises some questions 😅:
1) instead of using the powercables with ferrites. Could we also use a coax/shielded cable? Maybe coax is not a good example because the gnd is not the shield.
2) same for the connection between the DUT/LISN. At the time you connected them the span was bigger. Could we also suspect noise from the environment coupling into the wire? I think usually the original powercord is used of the DUT? (If applicable)
3) I see ground is connected between the two LISN’s and I guess also the electronic load. If the DUT has a earth/gnd, also connect that one?
4) LISN is put in dBuV mode. Current probe in dBa. Should we also put H-field probes in dBa and E-field probes in dBuV?
Hi Remy, thanks for the great questions. i have answered pretty much all of them in a new video. Enjoy!