Harmonic Measurement Conditions; Harmonic Measurement Conditions (Harmonics); Input Element Group (Elements); Pll Source (Pll Source) - YOKOGAWA WT5000 Features Manual

7 Harmonic Measurement Conditions

Harmonic Measurement Conditions (Harmonics)

Using harmonic measurement, you can measure functions that are based on the voltage, current, and power
harmonics and their distortion factors; on the phase angle of each harmonic relative to the fundamental; etc. You
can also compute the harmonic distortion factors for voltage and current.
For a list of the measurement functions that can be measured with harmonic measurement and their
descriptions, see "Harmonic Measurement Functions" under "Items That This Instrument Can Measure."
Click here.
The following menu items appear.
•

Input element group (Elements)

•

PLL source (PLL Source)

• Measured harmonic orders (Min Order/Max Order)
• Distortion factor equation (Thd Formula)
• Number of FFT points (FFT Points)
Input Element Group (Elements)
You can divide all the input elements into two groups: Hrm1 and Hrm2, and measure harmonics using two PLL
sources with different frequencies. You can measure the input and output harmonics of an AC–AC converter
whose input and output frequencies are different.
Element1 to Element7
Set the group of each element to Hrm1 or Hrm2. Input elements that are assigned to the same wiring unit are set
to the same group.
PLL Source (PLL Source)
For harmonics to be measured, the fundamental period (the period of the fundamental signal) that will be used to
analyze the harmonics must be determined. The signal for determining the fundamental period is the PLL (phase
locked loop) source.
Select the PLL source of groups Hrm1 and Hrm2 from the following options. The available options vary
depending on the installed elements.
U1, I1, U2, I2, U3, I3, U4, I4, U5, I5, U6, I6, U7, I7, Ext Clk
* If you select Ext Clk, the frequency of the signal applied to the rear panel's external clock input connector
(EXT CLK) is used as the fundamental frequency for harmonic measurement. For the EXT CLK connector
specifications, see section 4.3 in the Getting Started Guide, IM WT5000-03EN.
IM WT5000-01EN
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