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Users Manual

THDV – In Function A

Function A:

VTHD

∑

: RMS value of harmonic frequency #n.

: RMS value of the fundamental frequency.

THDV: total contents of harmonics of the line power voltage as a percentage

of the fundamental.

This algorithm is according to EN 61000-4-7.

THD of currents:

Function A:

THDI

∑

and

()

∑

IATHDI

: RMS value of harmonic frequency #n.

: RMS value of the fundamental frequency.

THDI: total contents of harmonics of the current as a percentage of the

fundamental.

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