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Users Manual
THDV – In Function A
THD
Function A:
V
: RMS value of harmonic frequency #n.
n
V
: RMS value of the fundamental frequency.
1
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:
THDI
Function A:
I
: RMS value of harmonic frequency #n.
n
I
: RMS value of the fundamental frequency.
1
THDI: total contents of harmonics of the current as a percentage of the
fundamental.
34
50
∑
2
V
n
n
2
V
V
1
50
∑
2
I
n
n
2
I
1
and
50
∑
THDI
A
n
2
I
n
2
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