Elenco PK101 w/ Computer Interface Instrukcja Użytkownika Pobierz pdf (Strona 10)

Now its time to look at your electronic signal in a different way. The oscilloscope features you have

been using show you voltage (amplitude) vs time, now you will see voltage vs frequency. Engineers

use expensive instruments called spectrum analyzers to do this, but Winscope uses a mathematical

transformation called an FFT to do this. Set the Y1 gain control back to its default position for now.

Click on the 5ms/div button to display a wider range, then click on the FFT button. Your display

should be similar to this:

You are seeing the frequency

spectrum of your signal, up to 22

KHz. Notice that most of the ener-

gy is at the low frequencies

(below 7 KHz), and there is very

little as you go higher.

The 1:1 gain mode does not apply to the FFT screen, so move the Y1 gain control down to here so

you can see the peak energy at the low frequencies.

Move the variable resistor control

and watch how it changes the fre-

quencies on the display.

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Elenco PK101 w/ Computer Interface Instrukcja Użytkownika Strona 10