Rigol DS1000CA series Guia do Utilizador descarregar pdf (Página 43)

RIGOL

User‟s Guide for DS1000CA Series

2-15

1. FFT Analyse

The FFT (Fast Fourier Transform) process converts a time-domain signal into its

frequency components mathematically. FFT waveforms are useful in the

following applications:

 Measuring harmonic content and distortion in systems

 Characterizing noise in DC power supplies

 Analyzing vibration

Press MATH→Operate→FFT to enter FFT setting menu.

Figure 2-17 Table 2-7 The FFT menu

Settings

Comments

Operate

A+B

A-B

A× B

FFT

Add source A to source B.

Subtract source B from source A.

Multiply source B by source A.

Fast Fourier Transform.

Source

CH1

CH2

Define CH1 or CH2 as FFT source.

Window

Rectangle

Hanning

Hamming

Blackman

Select window for FFT.

Display

Split

Full screen

Display FFT waveform on half screen.

Display FFT waveform on full screen.

Scale

RMS

dBV

RMS

Set “V

RMS

” as vertical unit.

Set “dBV

RMS

” as vertical unit.

Key points for FFT

1. Signals that have a DC component or offset can cause incorrect FFT

waveform component magnitude values. To minimize the DC component,

choose AC Coupling on the source signal.

2. To reduce random noise and aliases components in repetitive or

single-shot events, set the oscilloscope acquisition mode to Average.

3. To display FFT waveforms with a large dynamic range, use the dBV

RMS

scale. The dBV

RMS

scale displays component magnitudes using a log scale.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 145 146

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