SECTION 4 OPERATION
65
4.6.2.3 WAVEFORM SYNTHESIS (cont’d)
(Option: Harmonic Analysis and Synthesis)
The harmonic synthesis feature uses the formula:
WAVEFORM = Σ α
n
sin(nwτ + δ)
to calculate the finished waveform values.
Where: n = harmonic number
α
n
= harmonic amplitude (% of fundamental)
δ = harmonic phase angle
For example, the above formula may use values from the following tables:
WAVEFORM #1 SINE WAVE
n
αn %
δ
1 100 0 THD=0%
WAVEFORM #13 - IEC 77A CLASS 1
n
αn %
δ
1 100 0
3 8 0
5 9 0
7 5 0
11 2 0
13 2 0 THD = 12.6%
WAVEFORM #14 - IEC 77A CLASS 2
n
αn %
δ
1 100 0
3 6 0
5 8 0
7 7 0
11 7 0
13 6 0 THD = 14.4%
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