Then later in the problem's evolution, the fluorescent light plugged into the same circuit would sometimes flicker at the same time. Oddly enough (meaning FRUSTRATINGLY), the UPS software never showed under- or over-volts - so I assumed this was perhaps the UPS going bad/getting more sensitive. Assumed this was the AVR automatically switching transformer taps to boost/buck the voltage back to 120v - but it was basically impossible to tell from the UPS' LCD screen, as it insists on rotating displays constantly, making it all but useless to actually monitor a parameter. it would click every couple of seconds for a minute or two or five, then stop for a while. It was getting more frequent, but still came in bursts: i.e. I've had this happening for a few months now (random clicking of my UPS), and I think I've finally fixed it. I know this is an old thread, but wanted to return some value here - thank you to all previous posters for the education and insight. That's something that strikes me as very useful. I still intended to buy that ground testing gadget though. Perhaps it might have been the battery after all? That's one thing I definitely changed, and the unit itself was about 6 years old at the time, so the battery likely needed changing anyway. When I bought my PSU a few years ago, I had no idea what PFC was at the time, so it never even occurred to me.īut the important thing is that the annoying noise is totally gone. In fact, I just recently learned that my PSU has the active PFC capability, and that I should have used a pure sinewave output with it from the beginning. Haven't heard squat from the old UPS (which I have hooked up to the UHDTV and other stuff in the living room), or the new one which is powering my new system. To this day I have no idea what was causing it, but it's definitely gone. One day before my new UPS came, which is this model with pure sinewave output, the strange clicking noise completely vanished If you see something like 5V or 10V between neutral and ground, that means there is a grounding issue. Ground and neutral are the same electrical point, and current running through the neutral can cause the voltage to be higher than 0V, but it should still be very close to 0V. If you just have a multimeter, set it to AC voltage and measure the voltage between the neutral and the ground. If you don't already own one, you should buy a ground tester. I don't know if it was always broken like that (made in China) or if it was damaged after years of general wear and tear. The power bar used to feed power to their computer and monitor had defective grounding. I didn't know my parents had ground issues until I connected a UPS to their computer, and the UPS was reporting grounding issues. The wiring in your house is probably fine since we have wiring laws in this country, but it's always possible for the grounding in a power bar or extension cord to be damaged in some way. Do you have any hard-starting motors running on the same circuit as your computer? Fridges, freezers, some furnace fans, etc? Anything related to air conditioning? Vacuum cleaners? A large freezer will really screw with your voltages when the compressor turns on and off. Things like high efficiency motors have very high starting currents, but electronic devices generally do not. Click to expand.Possible, but very unlikely.
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