Fluke 1744 - Manual (Page 43)

1744/1743
Users Manual
34
THDV – In Function A
Function A:
1
50
2
2
V
V
V THD n
n
∑
= =
V
n
: RMS value of harmonic frequency #n.
V
1
: 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: 1
50
2
2
I
I
THDI n
n
∑
= =
and
( ) ∑
=
=
50
2
2
n
n
I A THDI
I
n
: RMS value of harmonic frequency #n.
I
1
: RMS value of the fundamental frequency.
THDI: total contents of harmonics of the current as a percentage of the
fundamental.
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