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I just acquired a used PS280. I have tested the DC voltage from it and it looks good across the +ve and -ve terminals on each of the three rails. However if I measure the potential relative to ground I see about a ~8 volt (peak) noisy ~60Hz AC wave. So both +ve and -ve terminals have the same AC wave relative to ground but the waves are separated in potential by a smooth DC voltage. My question; is this normal for this supply? I expected something more stable relative to ground.
I searched these forums and saw one post on the PS280 saying this is a rebranded GW Instek product.
Does anyone know what the equivalent product number from GW Instek is?
After downoading and reading the operating manual I have learned that you can operate in several modes, I think I am in floating mode and what I want is ground referenced mode which for my use involves connecting the -ve terminals to ground.
I did not expect to see such a big potential oscillation in floating mode but discovering that I can ground reference is great news.
I designed a simple circuit with a mosfet, potentiometer, and three thermistors
with negative temperature coefficient. I epoxied the thermistors into yellow spade
lugs and attached them to the three power transistors on the central heatsink.
System works great. When I hold one of the lugs between my fingers the fan
starts within 2-3 seconds and increases in speed as the resistance drops.
http://i128.photobucket.com/albums/p189 ... C_0726.jpg
http://i128.photobucket.com/albums/p189 ... C_0728.jpg
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