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    What is the differences between THD and thd in a PM5560?

    THD provides the indication of the quality of a waveform.
     
    Harmonic content calculations 
    1. Calculate harmonic content (HC).
    HC = √(H2)²+(H3)²+(H4)²...
    HC (harmonic content) is equal to the RMS value of all the non-fundamental harmonic components in one phase of the power system.

    2. Calculate the harmonic content for current (HCI).
    HCI = √(HI2)²+(HI3)²+(HI4)²...
    HCI (harmonic content current) is equal to the RMS value of all the non-fundamental current harmonic components (HI2…HIn) in one phase of the power system.
     
    Formula for calculating the THD and thd
    THD is total distortion present in a waveform and is the ratio of harmonic content to the fundamental. Formula used to calculate THD:
    THD = (HC/H1) x 100
    Where H1 is equal to the fundamental harmonic.
     
    thd uses  the RMS value for the total harmonic content rather than the fundamental content. 

    Formula used to calculate thd:
    thd = [HC/{√(H1)²+(HC)²}] x 100 
     

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