VOLTCRAFT DSO-2154 - Page 24

4.Advanced User Guidebook
21
analyzing the input signal on Oscilloscope. You can match these frequencies with
known system frequencies, such as system clocks, oscillators, or power supplies.
FFT function in this oscilloscope transforms 2048 data points of the time-domain
signal into its frequency components mathematically (the record length should be
10K or above). The final frequency contains 1024 points ranging from 0Hz to
Nyquist frequency.
Press the Math button to display the menu on the right, select Type as FFT.
Function Menu
Setting
Description
Type
FFT
Display the FFT menu
Source
CH1
CH2
CH3
CH4
Select the FFT source.
Window
Hamming
Rectangle
Blackman
Hanning
Kaiser
Bartlett
Select window for FFT.
Format
Vrms
dB
Select Vrms for Format.
Select dB for Format.
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Hori (Hz)
frequency
frequency/di
v
Switch to select the horizontal
position or time base of the FFT
waveform, turn the M knob to adjust it
Vertical
div
V or dBVrms
Switch to select the vertical position or
voltage division of the FFT waveform,
turn the M knob to adjust it
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Taking the FFT operation for example, the operation steps are as follows:
1. Press the Math button to display the math menu in the right.
2. In the right menu, select Type as FFT.
3. In the right menu, select Source as CH1.
4. In the right menu, select Window. Select the proper window type in the left
menu.
5. In the right menu, select Format as Vrms or dB.