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 no attention to the line on that graph, it’s very deceiving as the fan speed only went from a range of 607-609; in other words, it was a constant speed (within an error of margin). The fan was extremely quiet and that’s very impressive given how much power it can output.
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