A friend suggested this program as it has normal oscilloscope display, phase (XY) Lissajous, FFT, and a signal generator.
"Visual_Aanalyzer_Freeware"
at
https://www.zeitnitz.eu/scope_en
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The FFT display is labeled "Frequency" for some unknown reason. It has a zoom function that is rather useful.
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At the moment our 240V AC Mains has 3.8% to 4.5% harmonic distortion. It varies randomly. I wonder what effect a few hundred thousand people turning on their coffee makers has.....
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I have a 240V outlet at my radio desk just in case I ever want to get serious about ham radio and add a 5kw RF amp. [yea right after hell freezes over] It's really for a special space heater an electrician friend located for me.
[That warmed my room from 68F to 75F in 30 minutes. I've found I don't tolerate cold as well at 73 as at 16. Bummer.]
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The phase, which indicates short term, "instantaneous," frequency variation, goes wild at ~6:30 about the time the harmonic distortion also goes nuts.
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I have a 10MHz GPS disciplined oscillator with a magic PIC 10MHz to 60Hz (zero jiter) that I feed into the vertical and attenuated 60Hz from the AC mains into the horizontal. The Lissajous "circle" jitters like crazy until ~9:00AM when it "stabilizes" [sort of] then goes nuts around 4:00PM until ~7:00PM.
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Yea I know I have some really odd hobbies that will probably kill me someday,
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And yes it's a bit hypocritical that I routine monitor the AC Mains, but I'm extremely careful, have designed interfaces that are as safe as I can make them and the outputs are "idiot proof."
