3-1
IM WT1801-01EN
3 Harmonic Measurement Conditions (Option)
Harmonic Measurement Conditions (HRM SET)
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.”
Models with the Harmonic Measurement Option
The following menu items appear.
• PLL source (PLL Source)
• Measured harmonic orders (Min Order/Max Order)
• Distortion Factor Equation (Thd Formula)
Models with the Simultaneous Dual Harmonic Measurement Option
The following menu items appear.
• Input element group (Element Settings)
• PLL source of group Hrm1 (Hrm1 PLL Source)
• Measured harmonic orders of group Hrm1 (Min Order/Max Order)
• Distortion factor equation of group Hrm1 (Thd Formula)
• PLL source of group Hrm2 (Hrm2 PLL Source)
• Measured harmonic orders of group Hrm2 (Min Order/Max Order)
• Distortion factor equation of group Hrm2 (Thd Formula)
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 from the choices below. The available options vary depending on the installed elements.
U1, I1, U2, I2, U3, I3, U4, I4, U5, I5, U6, I6, and 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 WT1801-03EN.
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