How to test noise level of PSU? - diyAudio
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Old 10th August 2006, 01:24 AM   #1
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Join Date: Jul 2004
Location: Hong Kong
Default How to test noise level of PSU?

I have a multi-meter, a diy signal generator and an oscilloscope only.
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Old 10th August 2006, 01:38 AM   #2
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Read this article.. Should help you.
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Old 10th August 2006, 01:48 AM   #3
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kinda depends upon the purpose to which the power supply is intended -- there is a real, real, real guru amongst the denizen of DIYAUDIOr's and that's janneman

but here's a start -- use a capacitatively coupled differential amplifier for the input -- for those measuring power supply noise where a precise ADC measurement is required you want to filter the supply over a 100 milliHertz to 10 Hertz bandwidth for a period of 10 seconds. take a look at the materials on Texas Instruments website for their TL431 shunt regulator for a circuit --
Jim Williams application notes at Linear Technology also have some really excellent suggestions. I guess if you have a really good scope you could look at the envelope over a 10 second interval.
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