Comment on APC UPS switches to battery 50 times a day
Rivalarrival@lemmy.today 1 year ago
and it gets nowhere near those thresholds, the voltage fluctuates in the 224-234 range.
I’m assuming you measured hot to neutral, and didn’t find any transients.
Did you put your oscilloscope on hot to ground as well? A faulty ground could cause what you are seeing.
Do you have any CFL bulbs anywhere in your house? I once had a dead CFL bulb in a fixture in my basement. Anytime I turned on my basement light, every LED lamp in the house would strobe.
dosse91@lemmy.trippy.pizza 1 year ago
I tested live to ground, live to neutral, both in and out of the UPS, and I couldn’t see anything out of the ordinary.
The input signal isn’t a clean sine wave but it’s not dirty either, I’d say it’s sine with some extra harmonics and a little bit of noise. There were no sudden peaks or meaningful variations even while the UPS was switching furiously.
I don’t have CFL bulbs, only LEDs. I can’t think of anything else that could be causing interference. I’ll try contacting the power company as suggested by @glimse@lemmy.world
Thanks for all the replies.
Rivalarrival@lemmy.today 1 year ago
Just for shits and grind, how about neutral to ground? They should be bonded together in the breaker box (and nowhere else), but if there is a fault, you might see some significant potential across them.
You’ve tried different outlets?
dosse91@lemmy.trippy.pizza 1 year ago
From neutral to ground there seems to be just some noise and a bit of DC.
Yes, I tried different outlets, doesn’t make a difference. I checked the wiring inside the plug too, the connection seems solid.