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Cc initials test

this is the fourth session in our series of videos about EMC conducted emission testing in a previous sessions we described the test techniques and showed how to optimize the test parameters on our analyzer in this session we shall take an actual measurement and analyze the results here is a test setup showing the item to be tested which is a table lamp the lizhen the pre selector and the analyzer with a PC running the EMC engineer software will first turn they long on on the PC we select the input device which is a lism and then the preamplifier then the attenuation level this has been chosen as shown in the previous session to be 10 DB and also select the appropriate limit in this case we use e'en 5 501 5 which shows a quasi peak and the original limit levels also note that we are using the 150 kilohertz to 30 megahertz range which is band B as the initial result seen in the previous session showed that the emissions in bambe were well below the limits for this initial scan we have used a peak detector this is standard procedure as it gives a quickest result the limits however relate to quasi peak and average detectors so these are not really relevant to the peak detector we have just measured the standards to state that if the peak result is below both limits the product is compliant unfortunately in this case the peak result is clearly above the limits so we must now use the quasi-peak an average detectors to check the compliance of the product however the requirements of the EMC standards dictate that these detectors are slow so to scan the whole band would take significant time but we can improve productivity by choosing to select only those frequencies of interest this can be done using marker points mode in this mode we can choose frequencies by dragging and clicking the notice how the system automatically uses a zoomed window so that we can select the frequency very accurately also note how the list is sorted into frequency order regardless of the order in which we select the markers just one more and there we have a selection of five markers all have a red background because they are all above the limits the list includes frequency value limit level and the margin above or below the limit if we select marker points mode here the table is updated in real time and we can see the updates scrolling through the list we can select quasi-peak results which shows one failed frequency and average results which shows four failures we can display the results in bar graph format I'll just drag the window over here so it's not to cover the plot the vertical scales are normalized so that the limit level is in the middle of the axis we could show both quasi-peak and average results so now I have a...