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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: How can i tell my power source has noise? posted by michaelv20850 on March 23, 2007 at 14:42:24:
It is difficult to measure power line noise. That is because the power line voltage is so high in value that it swamps out the noise riding on it. The best way to actually measure power line noise is to make a passive notch filter for 50 or 60 Hz, depending on where you live, with an inductor and a capacitor. Then look at the residual with a scope or a spectrum analyser. This can be done by anyone who is sufficiently motivated and technical, but it is not absolutely necessary. If you can try a power line conditioner, AND it works for you, then you probably needed it. If it doesn't, then maybe your power line is fairly clean.
The last time I measured an AC power line, I found garbage out to RF frequencies, and plenty of stuff below 20KHz as well. It is NOT like the textbook assumption of what a power line should be, you know, a main component (60Hz, let's say), and a few harmonics. There was all kinds of stuff, including garbage from switching supplies and perhaps even power saving light sources. How this gets into your audio system is not easy to predict, but often it does, and it effects the sound of your audio (and video) equipment.
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Follow Ups
- Re: How can i tell my power source has noise? - john curl 17:05:43 03/23/07 (0)
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