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buying a THD meter

Discussion in 'General Electronics Discussion' started by docb, Nov 10, 2016.

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  1. docb

    docb

    131
    2
    Feb 11, 2010
    Does anyone have any suggestions for a meter that can test power THD?
    The purpose it to test THD on LED drivers.

    I see Fluke 43's at $3500. Was hoping for something closer to $1000.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,482
    2,830
    Jan 21, 2010
    Are you referring to measuring the affect on the mains waveform by the non-resistive load characteristics of (in this case) a LED driver?

    Just curious, because all my THD measurements have been on signals rather than power. (This told me a lot).

    This seems to be near your price point (and this is even cheaper).
     
  3. docb

    docb

    131
    2
    Feb 11, 2010
    That Schnedir is discontinued, unfortunately.
    I should have mentioned we need to test 120v, (277v would be nice, though not essential)
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There is a link on that page to the replacement model which is priced identically and operates from 110VAC to 415VAC
     
  5. TedA

    TedA

    156
    16
    Sep 26, 2011
    You should be able to make this measurement using a current transformer and a personal computer.

    Feed the signal into a sound input. Get yourself some audio measurement software and you are in business. Some of this software will provide a nice waveform display on the screen, separate values for each harmonic, etc, as well as the THD.

    You could also use a traditional audio harmonic distortion analyzer with the current transformer.

    Ted
     
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