Hi everyone,
I have an APC BK500MC 120V-300W (2002 model with only seriel port and two backup outlets and one surge output port)UPS with me. Just wanted to know if these normal UPS produce pure sinewave or are they those square wave inverters? Got a fan motor 208~230V 100W 1.2A from an A/C today, stepped it up with a 110V to 220V 100VA stepup transformer tried to test if its working and it did spin the fan but there was kinda loud hum when I ran it. But that noise isn't there when I tried to run it on a 220V outlet. So, is it because of the square wave from the UPS/Inverter? (Note: I don't have an oscilloscope with me to test its output waveform)
Thanks
I have an APC BK500MC 120V-300W (2002 model with only seriel port and two backup outlets and one surge output port)UPS with me. Just wanted to know if these normal UPS produce pure sinewave or are they those square wave inverters? Got a fan motor 208~230V 100W 1.2A from an A/C today, stepped it up with a 110V to 220V 100VA stepup transformer tried to test if its working and it did spin the fan but there was kinda loud hum when I ran it. But that noise isn't there when I tried to run it on a 220V outlet. So, is it because of the square wave from the UPS/Inverter? (Note: I don't have an oscilloscope with me to test its output waveform)
Thanks
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