2. misc-audio
  3. 157777-13272

Measuring line noise and power conditioners

I recently purchased a Trifield EMI (Dirty Electricity) Line Meter to measure noise coming from my outlets. To my surprise, my $500 power conditioner (name withheld to protect the potentially innocent) appears to not filter any noise per the Trifield readings. In fact, with some of my outlets the measures are higher through the conditioner’s outlets, than the measures coming straight out of the wall. The manufacturer denies anything is wrong with their conditioner, claiming the Trifield is measuring the wrong frequencies. Can anyone explain?

output555

Showing 6 responses by geoffkait

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geoffkait
23,365 posts
 
danvignau446 posts06-19-2020 10:36amHocus Pocus! Directional Alternating Current fuses are my favorite scam, and some electrical services somewhere might benefit from a tru power conditioner, but I doubt I will even move to outer Mongolia.

>>>>If it’s a scam it’s one helluva good one since more than 100,000 have been sold. You probably don’t realize it but fuses are always used in AC circuits. They’re all AC. Hel-loo! 
geoffkait's avatar
geoffkait
23,365 posts
 
Wow, I have seen that much jibber jabber since the last time I squeezed your head. You don’t get audio frequencies until the speaker diaphragm moves. Then you get audio, Mr. Smarty Pants. 👖Up until the signal gets to the speaker there is no audio, only current and voltage.
geoffkait's avatar
geoffkait
23,365 posts
 
robberrttddidd
High frequency RF as measured by these EMI toys does not represent well the much harder to filter frequencies on the AC line that are either in the audio band and/or close it and can sub-modulate down into the audio band.

>>>>Sub-modulate down to the audio band? Are you high? Radio Waves are not even in the same domain as acoustic waves. How can MHz or GHz electromagnetic waves submodulate down to the acoustic band? It almost sounds like you actually think the acoustic waveform is traveling through the wires and cables.
geoffkait's avatar
geoffkait
23,365 posts
 
So happy I jumped off the grid 4 years ago. 🤗 Good luck with all that.
geoffkait's avatar
geoffkait
23,365 posts
 
Uh, RFI and EMI are the same thing. Usually up in the mid-high MHz and low GHz frequencies, you know, radio waves, electromagnetic waves. When you ASSUME something you make a fool out of me and Uma Thurman.
geoffkait's avatar
geoffkait
23,365 posts
 
RFI also known as EMI types,

Electromagnetic interference can be categorized as follows:

And, Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infraredfrequencies;[1][2] these are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves. Different sources specify different upper and lower bounds for the frequency range.
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