Setting The Pll Source, Measured Harmonic Order, And Thd Equation - YOKOGAWA WT310E User Manual

6.3 Setting the PLL Source, Measured Harmonic
Order, and THD Equation
Procedure
Follow the procedure indicated by the thick lines in the following menu.
PLL Source
1.
Measured Harmonic Order
1.
THD Equation
1.
Explanation
PLL Source
Set the PLL (Phase Locked Loop; frequency synchronization) source, which is used to determine the
fundamental frequency. The fundamental frequency is the reference for the measured harmonics of
harmonic measurement. The default value is U1.
Be sure to specify a signal with the same period as the harmonic measurement source waveform.
Selecting an input signal with small distortion and fluctuation for the PLL source will enable stable
harmonic measurement.
• U1: The PLL source is set to the voltage of element 1.
• I1: The PLL source is set to the current of element 1.
• U2: The PLL source is set to the voltage of element 2 (WT333E only).
• I2: The PLL source is set to the current of element 2 (WT333E only).
• U3: The PLL source is set to the voltage of element 3 (WT332E and WT333E).
• I3: The PLL source is set to the current of element 3 (WT332E and WT333E).
6-6
(Display B)
3.
2.
(Display B)
2.
3.
(Display B)
2.
3.
Set the PLL source.
5.
(Display C)
4.
Confirm
the setting.
An example for the WT333E
The display varies depending
on the installed elements.
Set the harmonic order.
5.
(Display C)
4.
Confirm
the setting.
Set the equation.
5.
(Display C)
4.
Confirm
the setting.
6.
Close menu.
6.
Close menu.
6.
Close menu.
IM WT310E-01EN