SIGLENT SDS1000D Manual do Utilizador descarregar pdf (Página 39)

Table 2-9 FFT function menu 2:

FFT Option Setting Introduction

Vrms Set Vrms to be the Vertical Scale unit. Scale

dBVrms Set dBVrms to be the vertical Scale unit.

Display

Split

Full

screen

Display FFT waveform on half screen.

Display FFT waveform on full screen.

Page 2/2 Return the first page of FFT menu.

To use the Math FFT mode, you need to perform the following tasks:

1. Set up the source (time-domain) waveform.

●

Press the AUTO button to display a YT waveform.

●

Turn the vertical “POSITION” knob to move the YT waveform to the center vertically

(zero divisions).

●

Turn the horizontal “POSITION” knob to position the part of the YT waveform that you

want to analyze in the center eight divisions of the screen.

The oscilloscope calculates the FFT spectrum using the center 1024 points of the

time-domain waveform.

●

Turn the “Volts/div” knob to ensure that the entire waveform remains on the screen.

●

Turn the “S/div” knob to provide the resolution you want in the FFT spectrum.

●

If possible, set the oscilloscope to display many signal cycles.

To display FFT correctly, follow these steps:

1. Push the “MATH” button.

2. Set the “Operation” option to FFT.

3. Press the “Source” button to select “CH1”, “CH2”, “CH3” or “CH4”

according to input signal channel.

4. According to Nyquist law, turn the “S/div” knob to adjust the sampling

rate(This parameter is displayed behind the time base parameter) is at

least double than input signal frequency.

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SIGLENT SDS1000D Manual do Utilizador Página 39