1-3
IM WT310E-01EN
Features
1
Measurement Functions Used in Harmonic Measurement (Option)
Harmonic measurement functions are measured for each input element and only work with single-
phase measurement. They cannot measure comprehensive measurement functions that treat multiple
phasesasasinglewiringunit(Σfunctions).
Measurement
Function
(Symbol)
Panel Indicator
Light
Description
U(k) V Rmsvoltagevalueofharmonicorderk
I(k) A Rmscurrentvalueofharmonicorderk
P(k) W Active power of harmonic order k
λ(k) PF Power factor of the fundamental wave (1st harmonic)
Φ(k) V°or
A°
Phase difference between the fundamental voltage and fundamental
current when the harmonic order k is the 1st harmonic (fundamental
wave)
Uthd THDV% Total harmonic voltage distortion
Ithd THDA% Total harmonic current distortion
Uhdf(k) V% Harmonic distortion factor of voltage for harmonic order k
Ihdf(k) A% Harmonic distortion factor of current for harmonic order k
Phdf(k) W% Harmonic distortion factor of power for harmonic order k
ΦU(k) V° Phase difference between the voltage of harmonic order k and and the
fundamental voltage
ΦI(k) A° Phase difference between the current of harmonic order k and the
fundamental current
k: The harmonic order, which is indicated in display A.
Harmonic Measurement Function Orders
The harmonic orders that you can specify are indicated below.
Measurement
Function
(Symbol)
Panel Indicator
Light
Total Value (Total rms
value)
1 (fundamental
wave)
Harmonics
U(k) V Yes Yes 2to50*
I(k) A Yes Yes 2to50*
P(k) W Yes Yes 2to50*
λ(k) PF No Yes No
Φ(k) V°or
A°
No Yes No
Uthd THDV% Yes No No
Ithd THDA% Yes No No
Uhdf(k) V% No Yes 2to50*
Ihdf(k) A% No Yes 2to50*
Phdf(k) W% No Yes 2to50*
ΦU(k) V° No No 2to50*
ΦI(k) A° No No 2to50*
k: The harmonic order
* The maximum measured harmonic order varies depending on the frequency of the fundamental
wave. (See section 7.4, “Harmonic Measurement,” in the Getting Started Guide, IM WT310E-
02EN.)
1.1 Items That This Instrument Can Measure
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