How to test noise level of PSU?

Sunsun22 · 10th August 2006, 02:24 AM

I have a multi-meter, a diy signal generator and an oscilloscope only.

mike.m216 · 10th August 2006, 02:38 AM

Read this article.. Should help you.

http://tangentsoft.net/elec/psu-tests/

jackinnj · 10th August 2006, 02:48 AM

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.

10th August 2006, 02:24 AM	#1
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	How to test noise level of PSU? I have a multi-meter, a diy signal generator and an oscilloscope only.

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10th August 2006, 02:38 AM	#2
mike.m216 diyAudio Member Join Date: Jun 2006	Read this article.. Should help you. http://tangentsoft.net/elec/psu-tests/

10th August 2006, 02:48 AM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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