SIGLENT SDS1000D Manual do Utilizador descarregar pdf (Página 42)

5. Measuring an FFT Spectrum Using Cursors

You can take two measurements on FFT spectrums: magnitude (in dB) and frequency

(in Hz). Magnitude is referenced to 0 dB, where 0 dB equals 1 VRMS. You can use the

cursors to take measurements at any zoom factor. (Refer to cursor measure2.11.2)

Use horizontal cursors to measure amplitude and vertical cursors to measure

frequency.

If you input a sine signal to channel 1, follow these steps:

1. Measure FFT Amplitude

1) Input a sine signal to channel 1, and press the “AUTO” button.

2) Press the “MATH” button to enter the “MATH” menu.

3) Press the “Operation” option button to select “FFT”.

4) Press the “Source” option button to select “CH1”.

5) Press CH1 button to display CH1 menu.

6) Turn the “S/div” knob to adjust sampling rate (at least double bigger than frequency

of input signal).

7) If FFT display on full screen, press CH1 button again to remove channel waveform

display.

8) Press the “CURSOR” button to enter “Cursor” menu.

9) Press the “Cursor Mode” button to select “Manual”.

10) Press the “Type” option button to select “Voltage”.

11) Press the “Source” option button to select “FFT”.

12) Press the “CurA” option button; turn the “Universal” knob to move Cursor A to the

highest point of the FFT waveform.

13) Press the “CurB”option button, turn the “Universal” knob to move Cursor B to the

lowest point of the FFT waveform.

14) The amplitude (△T) displays on the top of the left screen.

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SIGLENT SDS1000D Manual do Utilizador Página 42