How To Zoom The Waveform - Owon VDS1022l User Manual

 DC component or offset can cause incorrect magnitude values of FFT waveform. To minimize the DC component, choose AC Coupling on
the source signal.
 To reduce random noise and aliased components in repetitive or single-shot events, set the oscilloscope acquisition mode to average.
What is Nyquist frequency?
The Nyquist frequency is the highest frequency that any real-time digitizing oscilloscope can acquire without aliasing. This frequency is half of the
sample rate. Frequencies above the Nyquist frequency will be under sampled, which causes aliasing. So pay more attention to the relation
between the frequency being sampled and measured.
Note：
In FFT mode, only support to set coupling, voltage division and zero position in Channel window, other operations are prohibited. If you want to
enter other menus, uncheck "FFT" first.

11.How to zoom the waveform

Click to show Function menu, choose " Horizontal ".
Main Time Base
The setting of the horizontal main time base is used to display the waveform.
Assist Set
A window area is defined by two cursors, which will be expanded to the full screen size in Window Expansion.
Choose W value from the combo box to adjust the size of this window area. Click
position of the area in main window by it.
Note: In Assist Set status, the time base and horizontal trigger position can not be set.
Window Expansion
Click "Zoom", the window area defined by two cursors will be expanded to the full screen size.
You can adjust the time base W and horizontal trigger position Tw of zoom window in the menu. You can also drag the red pointer to adjust the
horizontal trigger position (3 in II. User Interface).
to show the slider bar. You can adjust the horizontal
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