Thd - Iskra MC320 User Manual

THD
63

2
I
n
 
 
n 2
I

THD

%
f
I
1
63

U
 
 
n 2
U THD %
f
U
f 1
63

U
 

 n 2
U THD %
ff
U
ff
74
Current THD
I ‐ value of first harmonic
 1
100
n ‐ number of harmonic
2
Phase voltage THD
fn
U ‐ value of first harmonic
 1
100
n ‐ number of harmonic
2
Phase‐to‐phase voltage THD
ffn
U ‐ value of first harmonic

1
100
n ‐ number of harmonic
1
Measuring centres – MC320, MC330, MC350 & MC350H ‐ User's Manual
APPENDIX E: CALCULATIONS & EQUATIONS