¿ªÔÆÌåÓýHi Regi. Measuring the performance of "EMI" filters can be done many ways depending on what kind of data or information is required. There are so many different kinds of filters and so many different applications for them that it is difficult to find just one of two sources of information that will answer all of your questions. Many different filter companies measure things in different ways and few are eager to release their test methodology. I will be happy to help you the best I can off line. Being an old tempest engineer goat my field and EMC has some overlap in different places. As a point of interest have a look at these
papers & sites, if anything it will help introduce you to
many of the terms used and at least provides a primer to the
subject. I will see if I can forward to you additional reading
material in the near future.....has several Dr. appts today and
this week. 73 Gedas, W8BYA Gallery at Light travels faster than sound.... This is why some people appear bright until you hear them speak. On 2/11/2019 1:33 AM, Reginald
Beardsley via Groups.Io wrote:
I've been lazy and not read the entire manual. Where do you set the coupling? I fired it up and tried all the buttons, but did not find the AC/DC coupling on my 8560A. I presume I'd need to first measure the input and output impedances and then construct matching baluns.. Whatever is not reflected is transmitted except for any absorption due to resistive losses. So except in certain pathological cases reflection does not matter. But sometimes it does. In reflection seismology the water layer reverberation is a major aggravation. I'm afraid I've gone off the deep end. My power feed for my bench is all shielded with Liquatite SL-516 flex conduit. I cut off the cords, and ran them from Appleton 4SS boxes (which I do *not* recommend as it gets *very* cramped). I bought them because they fit the external space nicely, but got beat up pretty badly getting the wires to fit inside. I still need to mount a 20 A EMI filter where I connect to the mains. I've got a filter, but it's rather large and I still need to find a suitable enclosure. This might seem like overkill, but if you investigate the radiated EMI from a GW Instek GDS-2000E series scope you'll be appalled by the radiated EMI. There is *no* shielding on the SMPS. I plan to correct that as I have a bending brake and can fabricate an enclosure, But after discovering the issue decided that shielding my power feed was worth while. Besides which I really did not have room for runnning all the power cords into power strips. The last attempt at that led to a wad of cables of absurd dimension. As for probes, so far Bob Pease has kept me to the strait and narrow. |
