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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: digital meter volatile reading, when I try to measure the AC ripples in smps posted by wlee on November 22, 2014 at 13:38:50:
Ordinary digital or analog meters have a limited bandwidth and are essentially designed to read steady, not impulsive signals.
What you are experiencing is the inability to capture fast lf or hf transients generated by a computer's demand for current as requirements kick in.
To see real voltage rail noise in a computer and to measure pulses, you need a high bandwidth scope, ideally an analog one with a good trigger. When you do, you will see low frequency pulses as well as high frequency ones that are orders of magnitude above the common 'mV' noise quoted in PC magazines or websites. These numbers mean nothing by way of real life performance.
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Follow Ups
- RE: digital meter volatile reading, when I try to measure the AC ripples in smps - fmak 09:03:52 11/23/14 (0)
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