Who you gonna call? The Blur Busters! For Everything Better Than 60Hz™
https://forums.blurbusters.com/
It did fix it for me, don't remember the model but was around 300$ if I remember correctly.
Well what do you mean by neutral wire problems , if its about resistance or undersized vs This should start serious voltage problems anyway.MK92 wrote: ↑10 Oct 2025, 05:21What a double conversion online UPS should fix in theory:
-Voltage fluctuation, too low voltage or too high voltage
-RF interference
-EM interference
-Basic harmonics (in my case it didn't help though, probalby because they are either interharmonics or because values are simply too high)
What a double conversion online UPS will NOT fix:
-Problems with electricity related to installation in your house/apartment, not the electrical grid, so:
-Grounding problems
-Neutral wire problems
-Faulty sockets, bad contacts
I tried with PowerWalker VFI 1000C LCD, it says "THD: ≤ 3% THD (linear)" and "THD: ≤ 6% THD (non-linear)", if that's what you meant.amorou wrote: ↑10 Oct 2025, 15:25Well what do you mean by neutral wire problems , if its about resistance or undersized vs This should start serious voltage problems anyway.MK92 wrote: ↑10 Oct 2025, 05:21What a double conversion online UPS should fix in theory:
-Voltage fluctuation, too low voltage or too high voltage
-RF interference
-EM interference
-Basic harmonics (in my case it didn't help though, probalby because they are either interharmonics or because values are simply too high)
What a double conversion online UPS will NOT fix:
-Problems with electricity related to installation in your house/apartment, not the electrical grid, so:
-Grounding problems
-Neutral wire problems
-Faulty sockets, bad contacts
Same goes for bad contacts.
If you meant impedance , ups will provide low imp to pc i dont think ups itself will get effected much
Grounding is no concern , you can have perfect pc without grounding
About interharmonics , ups should eliminate them too , maybe freq of operating compenents of ups's will pass ? idk
How much output thd speced for non lineer devices on ups you tried?
Hmm , you said your town has 200 homes , generally voltages swing a lot on those places , maybe ups going bypass mode after too much voltage drop or smth , do u still have the ups ?MK92 wrote: ↑10 Oct 2025, 15:55I tried with PowerWalker VFI 1000C LCD, it says "THD: ≤ 3% THD (linear)" and "THD: ≤ 6% THD (non-linear)", if that's what you meant.amorou wrote: ↑10 Oct 2025, 15:25Well what do you mean by neutral wire problems , if its about resistance or undersized vs This should start serious voltage problems anyway.MK92 wrote: ↑10 Oct 2025, 05:21What a double conversion online UPS should fix in theory:
-Voltage fluctuation, too low voltage or too high voltage
-RF interference
-EM interference
-Basic harmonics (in my case it didn't help though, probalby because they are either interharmonics or because values are simply too high)
What a double conversion online UPS will NOT fix:
-Problems with electricity related to installation in your house/apartment, not the electrical grid, so:
-Grounding problems
-Neutral wire problems
-Faulty sockets, bad contacts
Same goes for bad contacts.
If you meant impedance , ups will provide low imp to pc i dont think ups itself will get effected much
Grounding is no concern , you can have perfect pc without grounding
About interharmonics , ups should eliminate them too , maybe freq of operating compenents of ups's will pass ? idk
How much output thd speced for non lineer devices on ups you tried?
Been around a year almost.amorou wrote: ↑10 Oct 2025, 15:27How long you got decent gameplay with ups ? Since agust ?
What they’re correct about
UPSs don’t “generate” sine waves magnetically. There is switching residue. A 3-phase delta-star isolation transformer gives the cleanest power isolation. 
What they’re wrong or overstated about
“Commercial UPSs produce chow-mein of harmonics.” “Only a 3-phase UPS can produce a real sine.”I mean we've seen the results, it doesn't require a scientist.amorou wrote: ↑11 Oct 2025, 08:54Hmm somebody wrote in hifi forum:
As an electrical engineer I can only say none of the so called pure sine wave commercial 1 phase UPS can provide you a pure sinewave as even a small kerosene engine driven genset can. They don't turn in a magnetic field like an AC generator in a perfect circle to produce a sine wave. All of them chop the DC and serve a chowmein of harmonics whatever filter they use.
Unless you have a 3 phase isolation transformer with delta connected primary and star secondary you are not going to eliminate fully the harmonics generated by the chowmein supply feeding into your gear. And for that you need a 3 phase UPS.
Chat gpt response:
Engineer is partly right, partly exaggerating. Let’s dissect what’s true, what’s outdated, and what matters for your PC.
What they’re correct about
UPSs don’t “generate” sine waves magnetically.
True — an AC generator’s rotating magnetic field produces a naturally perfect sine waveform by physics.
A UPS inverter digitally synthesizes the sine wave from DC using pulse-width modulation (PWM).
That means the waveform is composed of many high-frequency pulses that are then filtered by inductors and capacitors.
Even the best UPS inverter will have tiny high-frequency components (tens of kHz).
These are far above 50 Hz and easily rejected by any power supply — but they do exist if you measure with an oscilloscope.
It cancels common-mode noise, shifts ground references, and blocks many harmonics.
In datacenters, it’s the “gold standard.”
What they’re wrong or overstated about
“Commercial UPSs produce chow-mein of harmonics.”
Modern double-conversion UPSs (from Eaton, APC, Vertiv, etc.) use high-frequency PWM and multi-pole LC filters.
Output THD is < 2 % with linear load, < 5 % with nonlinear load — that’s far cleaner than most household grid feeds (which are 4–6 %).
The harmonics they do have are in the 20–100 kHz band, well outside your PC PSU’s sensitivity.
Not true — single-phase UPSs can and do produce near-perfect sine waves.
The 3-phase delta-star idea is about isolation and phase cancellation, not about the purity of the sine wave itself.
For a small single-phase load (like a PC), the difference is academic.