If the screen is joined to earth at the supply end you should get suppression. There's a whole discussion over whether it should be connected to earth at both ends, which I'll leave to others.
I used one of these on the output of a noisy inverter generator. The noise was being radiated by the extension lead plugged into the generator.I put it in a diecast box with a mains outlet socket and a short (30cm) lead to the generator. Very effective. Jaycar EMI Filter
I hadn't noticed those on the Jaycar site - thanks for this.
I guess that might filter out the crud close to the source, whereas a screened mains cable likely still has it and delivers it to the device.
Actually looking at the graphic on the unit, how did you wire it up - the generator to the two pin end and the extension cord with earth to the other end?
(26-05-2022, 01:44 PM)VK3RX Wrote: Actually looking at the graphic on the unit, how did you wire it up - the generator to the two pin end and the extension cord with earth to the other end?
Yes, commonly the "two pin end" is connected to the incoming supply, the UPS in your case and the other end to the load.
That middle pin on the load side is connected to the common earth line running from the supply side to load side.
For the circuit with the fuse built in, the power source (mains or genset) should be on the side of the filter feeding the fuse otherwise the fuse does not provide any protection in event of the filter failing.