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4
Main Feature Description
This chapter provides some general information that you need to learn before using an oscilloscope. It contains:
1.
Oscilloscope setup
2.
Trigger
3.
Data acquisition
4.
Waveform scaling and positioning
5.
Waveform measurement
4.1
Oscilloscope Setup
While operating the oscilloscope, you may often use three features: Autoset, saving a setup and recalling a setup.
Hereinafter they are introduced one by one.
Autoset: This function can be used to adjust the horizontal and vertical scales of the oscilloscope automatically and
set the trigger coupling, type, position, slope, level and mode, etc., to acquire a stable waveform display.
Saving a Setup: By default, the oscilloscope will save the setup each time before being closed, and automatically
recall the setup once being turned on. (Note: If you modify the setup, please wait for more than 5 seconds
before turning off the oscilloscope to ensure the proper storage of new settings.) You can save 10 settings
permanently in the oscilloscope and reset them as necessary.
Recalling a Setup: The oscilloscope can recall any of your saved setups and the default factory setup.
Default Setup: The oscilloscope is preset for normal operations when it is shipped from the factory. This is the
default setup.
4.2
Trigger
The trigger determines when the oscilloscope begins to acquire data and display a waveform. Once a trigger is
properly set up, the oscilloscope can convert unstable displays or blank screens to meaningful waveforms.
Here
introduce some basic concepts about trigger.
Trigger Source
The trigger can be generated with multiple sources. The most common one is the input channel (alternative between
CH1, CH2, CH3). Whether the input signal is displayed or not, it can trigger normal operations. Also the trigger
source can be any signal connected to an external trigger channel or the AC power line (only for Edge triggers). The
source with the AC power line shows the frequency relationship between the signal and the AC commercial power.
Trigger Type:
The oscilloscope has six types of triggers: Edge, Video, Pulse Width, Slope, Overtime and Alter.
Edge Trigger uses the analog or digital test circuits for triggering. It happens when the input trigger source
crosses a specified level in a specified direction.
Video Trigger performs a field or line trigger through standard video signals.
