When testing in a power supply laboratory it is difficult to take fan noise readings as the noise from the Sunmoon test equipment and air conditioning corrupts everything. The next best thing in our circumstances was reading off the fan speed with a tachometer to get an idea for the noise. The ambient temperature during testing held constant at 22 degrees, with 1 degree of variation. Each power supply had a consistent time period of 5 minutes to stabilise between each load scenario.
In my experience, the following general relationships apply between noise levels and fan speeds, though it can vary greatly between the type of fan used.
Pay close attention to the numbers on the left and you’ll notice that the fan speed only has a deviance of 12RPM here. This could be attributed to an error of margin in our testing hardware and it’s easier to say the fan was approximately 730RPM at all time. This is nice and slow and also incredibly quiet; you’re unlikely to ever hear this unit running!
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