It all depends on what type of UPS u have. A UPS is basically a battery charger, a battery and an inverter. If you have a switching UPS it'll only run off the battery when the power drops so in normal running it will not filter out line noise. If you have a continuous UPS then it will filter line noise.
Basically if u have a switching UPS the problem may still be line feedback and if u have a continuous it is'nt.
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