ITech IT7622 User Manual

Harmonic Function
Copyright ©ITECH Electronic Co., Ltd. 56
factor.
 %r:
use all harmonic measurement data from the minimum harmonic order
(0
th
) to the maximum harmonic order (within the upper limit of analysis
orders) as the denominator.
 %f: using the data of fundamental wave (1-order) components as the
denominator.
The distortion factor calculation formulas and methods of different
measurement functions are as follows:
Measurement
function
Calculation formula and method
%r
%f
Harmonic distortion
factor of voltage
( )
( )
TotalU
kU
( )
( )
1U
kU
Harmonic distortion
factor of current
( )
( )
TotalI
kI
( )
( )
1I
kI
Total harmonic
distortion rate of
voltage
( )
( )
TotalU
kU
k
∑
=
max
2
2
( )
( )
1
max
2
2
U
kU
k
∑
=
Total harmonic
distortion rate of
current
( )
( )
TotalI
kI
k
∑
=
max
2
2
( )
( )
1
max
2
2
I
kI
k
∑
=
NOTE
Total harmonics are calculated as follows:
( ) ( )
∑
=
=
max
0
2
k
kUTotalU
，
( ) ( )
∑
=
=
max
0
2
k
kITotalI
. k
indicates the harmonic order, and max indicates the upper limit of analysis orders. 50 orders
at most.
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ITech IT7622 Specifications

General

Brand	ITech
Model	IT7622
Category	Power Supply
Language	English