Gday Fahim
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So how to the Dewbuster and other commercial controllers mange to keep this down? Or at least advertise that it is reduced.
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Dunno, but i dont always believe everything i read ;-)
I have never seen/tested a Dewbuster, but i have seen a new Kendrick
It Has a metal chassis, and if this is earthed properly, then the RFI and noise back up the lines shld be reduced as the alloy chassis will form a shield. Also, the old kendricks i tested ran at about 5 on/offs per minute whereas the new ones were about 52Hz, thus the new ones dont thump on/off as much as prev, hence reduce noise spikes back up the supply lines, but they do produce rfi.
The problem ( with RFI ) comes when you attach a heater strip.
The wires between the controller and the strip radiate away like blazes
Again, i must stress, i know i have RFI coming from my units wires ( and anyone running a PWM device will also have RFI ). Its just a matter of "does it affect the scopes electronics".
To date, mine hasnt, so i dont worry too much.
Unfortunately, RFI reduction falls into the "black arts" category.
Andrew