17-8
IM CW240E
Harmonic Measurement Basic Equations
∑
50
n=2
Measurement Item Equations
Voltage RMS Value
Current RMS Value
RMS Value nth Order Content
Total Harmonic Distortion Ratio
(Fundamental Wave Standard)
Total Harmonic Distortion Ratio
(Total RMS Value Standard)
100%
RMS Value Phase Angle
(Fundamental Wave Standard)
Un
(nth order harmonic voltage phase) - (fundamental wave phase) n
In
(nth order harmonic voltage phase) - (fundamental wave phase) n
fundamental wave rms value
nth order rms value
Un =
2
(
Unr)
2
(
Uni)
2
In =
2
(
Inr)
2
(
Ini)
2
THDF =
(fundamental wave voltage (current) rms value)
2
(nth order harmonic voltage (current) rms value)
2
THDR =
(nth order harmonic voltage (current) rms value)
2
= tan
–1
(
)
{
tan
–1
(
)}
n
Uni
Unr
U1i
U1r
RMS Value Phase Angle
(U1 Standard)
Un
(nth order harmonic voltage phase)
In
(nth order harmonic current phase)
= tan
–1
(
)
Uni
Unr
= tan
–1
(
)
Ini
Inr
= tan
–1
(
)
{
tan
–1
(
)}
n
Ini
Inr
I1i
I1r
∑
50
n=2
(nth order harmonic voltage (current) rms value)
2
∑
50
n=1
17.1 CW 240 Specifications
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