OWON VDS Series - Manual (Page 25)

When the "Infinite" option is set, the measuring points will be stored till the controlling value is changed.
Click "Clear" button, the persistence will be cleared.
Note:
If the time base, voltage division, deep memory is changed, or the channel is turned off/on, the persistence will be cleared automatically and
record the updated waveform.
Grid Brightness
Drag slider to adjust the brightness of grid in the Waveform Display Area.
10.Use Mathematical Manipulation Function
The Mathematical Manipulation function is used to show the results of the addition, multiplication, division and subtraction operations between
Channel 1 and Channel 2, and the FFT operation of Channel 1 or Channel 2.
Math of dual waveform
1. Turn on CH1 and CH2.
2. Click to show Function menu, choose "Math". Check "Math".
3. Choose the factors and operator. Select the voltage division of M. The software transforms the waveform data of the two factors into selected
voltage division of M and calculates. The green calculated waveform M is displayed in the screen.
Using FFT function
The FFT (fast Fourier transform) math function mathematically converts a time-domain waveform into its frequency components. It is very useful
for 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 and the
final frequency contains 1024 points ranging from 0Hz to Nyquist frequency.
Taking the FFT operation for example, the operation steps are as follows:
1. Click to show Function menu, choose "Math". Check "FFT". The user interface is switched into Three View mode.
2. Set "Channel", "Window", "Format", "Scale", "Frequency Base".
3. You can drag anywhere in FFT window to move the signal up and down and side to side.
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