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Measuring voltage current phase shift

Discussion in 'General Electronics Discussion' started by Jeanguypataterubberboot, Jul 9, 2013.

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  1. Jeanguypataterubberboot

    Jeanguypataterubberboot

    41
    2
    Jul 9, 2013
    Is there a way to measure the phase shift between the voltage and current in a circuit on a scope? Or is it just done mathematically ?

    This may be a dumb question but I'm a newbie and still learning this stuff.

    Thanks for the help

    Pierre
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    There are several ways.

    One is to use a dual channel scope to show voltage on one trace and current on the other (ensure you get the right mode for this on an analogue scope!). Current is measured with a current probe or by looking at the voltage across a series resistor. Be careful with your grounds!

    The other way is to use X/Y mode on the scope. This will draw a line (or shape) which tells you very clearly what the phase relationship is between the signals.

    There may be other ways
     
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