SIMPLORER User Manual V6.0 - FER-a

Calculating Total Harmonic Distortion (FFT Analysis)
Characteristics
SIMPLORER 6.0 — Manual 447
With the ANALYSIS>POWER menu in the DAY Post Processor, you can calculate the Total Harmonic
Distortion, a measure of the harmonic content, for any simulation quantity. However,
it is necessary to define a time period (through cursors) which is used for computation the Total
Harmonic Distortion.
∞
2
∑ An n = 2
∞
2
∑ An n = 1
k = ---------------------------- THD1= ∞
2
∑ An n = 2
A1 ----------------------------
The button opens the dialog to select table or graphic. The calculated values are
displayed in a separate window in the selected presentation form.
The CHARACTERISTICS command includes tools to compute parameters important in time domain
system analysis. Select first a data set and then a data channel by a mouse click in the
window below. The characteristics, displayed in the table, relate always to the last selected
data channel.
Value
(data channel)
Display for
active cursors
The command compiles the characteristic values of all selected data channels in a
table. If cursors are active, then they represent the boundary values on the X axis for the parameter
computation.