Main Feature Description Chapter 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 thr feature: Autoset. 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.
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 and CH2). Whether the input signal is displayed or not, it can trigger normal operations. 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. ➢ Pulse Width Trigger can trigger normal or abnormal pulses that meet trigger conditions. ➢ Slope Trigger uses the rise and fall times on the edge of signal for triggering. ➢ Overtime Trigger happens after the edge of signal reaches the set time. ➢ Alter Trigger , as a feature of analog oscilloscopes, gives stable displays of signals at DSO1000B(V )Series HandHeld Oscilloscope User Manual 8