Math Fft - Hantek DSO4072 User Manual

Probe Attenuation
Invert
Coupling

If the channel adopts a DC coupling mode, you can quickly measure the DC component of the
signal by observing the difference between the waveform and the signal ground.

If the channel adopts an AC coupling mode, the DC component in the signal is filtered. By this
mode, the AC component of the signal is displayed at a higher sensitivity.

If the channel adopts a GND coupling mode, cut off the input signal. Inside the channel, the
channel input is connected with a zero volt reference electric level.
Fine Resolution
In the fine resolution setting, the vertical scale readout displays the actual VOLTS/DIV setting. The
vertical scale changes only after you adjust the VOLTS/DIV control and set to coarse.
Remove Waveform Display
To remove a waveform from the screen, first push the menu button to display the vertical menu,
then push again to remove the waveform. A channel waveform which is unnecessary to be
displayed can be used as a trigger source or for math operations.
4. MATH MENU: Display the waveform math operations. See the table below for details.
The MATH menu contains source options for all math operations.
Operations Source Options
＋
CH1+CH2
CH1-CH2
－
CH2-CH1
X CH1xCH2
CH1/CH2
/
CH2/CH1
FFT CH1 or CH2
Note: All selected menus are highlighted in orange.

2.7.2 Math FFT

This chapter elaborates how to use the Math FFT (Fast Fourier Transform). You can use the Math
DSO4000 Series Digital Storage Oscilloscope
1X
Selects a value according to the probe attenuation factor so
10X
as to ensure correct vertical readouts. Reduce bandwidth to
100X
6MHz when using a 1X probe.
1000X
Off
Inverts the waveform relative to the reference level.
On
Comments
Add Channel 1 to Channel 2.
Subtract the Channel 2 waveform from the Channel 1
waveform.
Subtract the Channel 1 waveform from the Channel 2
waveform.
Channel 1 multiply channel 2
Channel 1 divide channel 2
Channel 2 divide channel 1
Three types of window available for selection: Hanning,
Flattop, Rectangular.
Zoom: Use the FFT Zoom button to adjust the window size.
Scale: x1, x2, x5, x10.
Basic Operation
16