Measuring AC Power Line Noise - Page 10
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  1. #91
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    Re: Measuring AC Power Line Noise

    Quote Originally Posted by Alrainbow View Post
    If you live in the continental states it's too high at 115 to 130.
    So I'm not sure what your question is
    Yes, I live in the USA but am using Japanese 95VAC electronics via a step down transformer. I seem to have a noise issue and I would like to see if that is on my AC main, is due to the transformer, or possibly something else?

  2. #92
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    Re: Measuring AC Power Line Noise

    Ok if ok let me ask you a question
    What type of transformer is it ? A pic and make and model also what device are you using with it. More than one ?

  3. #93
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    Re: Measuring AC Power Line Noise

    Quote Originally Posted by vortrex View Post
    Can this be done more accurately with a digital oscilloscope? Seems like plenty of options in the $200-$300 range on Amazon.
    Yes it can, but only if you have the technical knowledge to use equipment like this on an AC power line. In the R&D lab we would hide the good O-scope probes from the techs. They often made hook-up mistakes and wasted the probe.

    It's much better to measure the signal-to-noise ratio at the audio output of your hi-fi system. All this requires is a sensitive DMM.

    Well designed hi-fi components can deal with a lot of AC power line noise (that's because they generate a lot of the line noise).

  4. #94
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    Re: Measuring AC Power Line Noise

    While measuring the output of devices can show noise it does not lend itself to why or where it starts
    If we measure at the line or both line and psu dc output the given data is more conclusive reg power.
    Lastly to Measure at the output is far more complex too.

  5. #95
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    Re: Measuring AC Power Line Noise

    Quote Originally Posted by Alrainbow View Post
    While measuring the output of devices can show noise it does not lend itself to why or where it starts
    If we measure at the line or both line and psu dc output the given data is more conclusive reg power.
    Lastly to Measure at the output is far more complex too.
    That's all completely backwards.

  6. #96
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    Re: Measuring AC Power Line Noise

    Quote Originally Posted by Speedskater View Post
    That's all completely backwards.
    Could you explain this statement?
    Logic would dictate garbage in, garbage out.
    My System:
    A trusty old Pioneer PD-65 as a Transport, Lumin A-1, a Merrill Heirloom T.T. as sources. A Lampizator DAC to PAD Cables to a SP-14 Tubed PreAmp, Pass XA30.5 , Fusion speaker cables, AudioKinesis Zephryn 46 Speakers. pair Rythmik F-12 subs, EP2050, Kaplan Power cables, Hydra power conditioner, Two dedicated 20Amp power lines. DIY corner traps and Acoustic Geometry Curves for room treatment.

  7. #97
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    Re: Measuring AC Power Line Noise

    Speed I can't understand your comment either. Please clarify if possible
    TUBEZATOR

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