Owon HDS-N Series Uživatelský manuál stáhnout pdf (Strana 72)

OWON HDS-N Series Handheld DSO & DMM 8-Advanced Function of Oscilloscope

Fig.59: the second page of the record

8.14 Using FFT

An FFT breaks down signals into component frequencies, which the oscilloscope uses to display a

graph of the frequency domain of a signal, as opposed to the oscilloscope's standard time domain

graph. You can match these frequencies with known system frequencies, such as system clocks,

oscillators, or power supplies.

FFT in this oscilloscope can transform 2048 points of the time-domain signal into its frequency

components and the final frequency contains 1024 points ranging from 0Hz to Nyquist frequency.

The following table describes the FFT menu:

Function Menu Setting Instruction

FFT

OFF

Turn on FFT function

Turn off FFT function

Source

CH1

CH2

Select CH1 as FFT source

Select CH2 as FFT source

Window

Rectangle

Blackman

Hanning

Hamming

Select window for FFT.

Format

Vrms

Set Vrms as vertical scale unit

Set dBVrms as vertical scale unit

Zoom

×1

×2

×5

×10

Set multiple ×1

Set multiple ×2

Set multiple ×5

Set multiple ×10

Taking the FFT operation for example, the operation steps are as follows:

1. Press MENU key and the function menu appear on the right side of the screen.

2. Press MENU ▲ or MENU ▼ key to select FFT MODE. Five items selectable are available

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Owon HDS-N Series Uživatelský manuál Strana 72