model SL-1001 forza powe 1000va 600va

Hello, good afternoon, I hope this device helps me the forza brand ups model SL-1001 I have it as a protector I have the fan the TV and the encoder the mark its normal output 110v but what is strange to me is that a reflex time sounds and the fan rolls With a little more force I measure with the multimeter and mark the 127v output I would like to know if that is normal for my device. Of course, it lasts like that with that 127v then goes back down to 110 normal but I would like to know if it is working normal thanks