User Manual
CHAPTER 7. HARMONIC MEASUREMENT FUNCTION 33
7.3 Setup Menu
The setup menu allows the user to set the distortion factor calculation formula, PLL source, and set of harmonics
to analyse and display. From the Harmonic Measurement function, , press the “MENU” soft-key.
Figure 7.4: Harmonic Measurement Setup Menu
7.3.1 Parameters
Use the arrow keys to select the dierent parameters, and if numeric, the rotary knob to set the value, or the
soft-keys.
THD Formal Distortion factor calculation formula.
% r displaying harmonics in the form of percentage to the overall current (voltage, power) amplitude of
all harmonics.
% f displaying harmonics in the form of percentage to the fundamental wave current (voltage, power).
PLL Source Select the PLL (Phase Locked Loop) source: U/I/OFF. Used for determining the fundamental
wave cycle as the reference for analysis of harmonic orders.
Serial Harmonic sequence: whole sequence/odd sequence/even sequences
Order Max Set the harmonic analysis orders (1-50). You can specify the harmonic measurement range. These
specied analysis orders are used for calculating the value of the distortion factor.
7.3.2 Distortion factor
Distortion is either calculated relative to the fundamental (%f) or to the total signal (%r). Internally, the 5335B
calculates according to the following equations: