Hardware Insights Forum

I was told by a friend of mine that deals a lot with hardware pc parts, that a UPS brand named "EAST" produces high quality UPS.
Never heard this brand before and i would like to tell me if you know anything about it
I looked at the internet for reviews but didn't find something

I've never heard of them. I prefer APC myself.

c_hegge wrote:I've never heard of them. I prefer APC myself.

I used to have a lot of trust for Cyberpower, but lately i bought a Cyberpower 1300VA UPS ( http://eu.cyberpowersystems.com/product ... pfclcd.htm ) and put it at my brother's pc.
After a while, (*about a month), i noticed that i could hear from distance the sound of the electric current running through the UPS (*when i say from distance, i mean i could hear the sound from 0,5 meters away !! Another Cyberpower i use for my own pc is completely silent (* http://eu.cyberpowersystems.com/product ... avrlcd.htm ).
So i figured that something is going wrong with the new UPS and decided to pull it out.
Any suggestions? I had it connected to the "battery backup socket", shall i try to see if the same sound comes when connected to "surge only socket", or it's a waste of time?

Does the sound change depending on whether the PC is on or off? If not, then it probably won't make a difference. It could be a transformer hum (which happens either when there is excessive ripple going through one of the transformer's windings, or the windings are loose, and are vibrating at an audible frequency), much like coil whine in a PSU.

c_hegge wrote:Does the sound change depending on whether the PC is on or off? If not, then it probably won't make a difference. It could be a transformer hum (which happens either when there is excessive ripple going through one of the transformer's windings, or the windings are loose, and are vibrating at an audible frequency), much like coil whine in a PSU.

No the noise at the UPS doesn't change whether the pc is on or closed.
What do you mean excessive ripple at the transformer? is it something i should worry, or this is something that could be considered as "normal operation" for the UPS?
Do you think it is safe to start using it again? or maybe 1st should i send e-mail to Cyberpower?
P.S: This UPS has more than enough power to back my system (*i mean it is operating with only 30-40% load when my brother uses his pc. He has an i5 cpu / 780 gtx gpu / 8 GB ram / and a Seasonic 660 platinum psu ), so is it normal to appear an excessive ripple at the transformer like you mention?

^
It depends on the sound. If it's more of a hum, then it's probably just loose windings vibrating at mains frequency (50-60Hz), which is probably nothing to worry about. If it's more of a whine, then it's more likely to be higher than normal ripple going through the coils. That may be more of an issue, depending on what's causing it.

c_hegge wrote:^
It depends on the sound. If it's more of a hum, then it's probably just loose windings vibrating at mains frequency (50-60Hz), which is probably nothing to worry about. If it's more of a whine, then it's more likely to be higher than normal ripple going through the coils. That may be more of an issue, depending on what's causing it.

Hmmm, i see, ok thanks for the info