On 8/23/2021 9:04 PM, Hugo Loranger wrote:
I had 3 Cyberpower CP1500PFCLCD and in operation I hear a lot of noise.
When they are on standby, they are silent but when the current cuts off the
noise increases drastically.
I have a switch where the 2 UPS are connected and when it is off it is obvious
that the noise comes from the 2 ups ...
Hi Hugo,
I have not evaluated them when the power is down and they are supplying
power to their loads. I have serious common mode chokes on their power
cables, as I do with all potential noise sources.
73, Jim K9YC
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