AEMC 721 User Manual page 31

%THD Application Example:
It is possible to calculate total harmonic current from a %THD reading
when a true RMS current or voltage is also known. First, solve for the Fun-
damental current using the following example:
2
RMS
Fundamental =
2
%THD
+1
100
With the value for fundamental current known, we can calculate for the
amount of Harmonic Current.
Harmonic =
2 2
(RMS) – (Fundamental)
Example:
The Model 721 measures a RMS value of 230 Amps and THD of 130%.
This means that the harmonic content is 130% of the fundamental. Calcu-
late for Total Harmonic current by solving the equations:
�
���
���������������
�
����
��
���
��������������� ���������������
����
������������ �����������������������������������
���
30
Harmonic Meter Model 721