What is the function of the trigger level knob of the oscilloscope?
1. First, understand the function of the "level" knob of the oscilloscope: it is to adjust and set the trigger level value.
2. The level value refers to using an oscilloscope to observe a signal waveform of a fixed frequency, which means to display the voltage value of the "waveform" on the screen in a timely manner. It means to move the display point from left to right at a certain speed. This is scanning.
3. Scanning starts from the left end, ends at the right end, starts from the left end again, and repeats. In order to obtain a stable waveform, the starting timing of each scan must be the same. Otherwise, the "waveform" will move left or right on the screen, or even become chaotic. In order to control the starting timing of each scan, there is a detection The circuit detects that the observed signal reaches a certain level value and triggers immediately to start scanning.
4. Select the trigger level: The trigger level needs to only observe one signal and use the internal trigger. To make the displayed waveform start to change upward, select + for the trigger polarity, otherwise select -, and then adjust the trigger level and X-axis time. until the waveform stabilizes.
5. That's basically it. Different models and manufacturers may be different, but the difference is not big. Basically, the principle is the same, and relevant adjustments should be made according to the specific conditions.
How many triggering methods does an oscilloscope have? How to choose the triggering method of an oscilloscope?
(1) Normal: When there is no signal, there is no display on the screen; when there is a signal, it displays a stable waveform in conjunction with the level control;
(2) Auto: When there is no signal, the light trace is displayed on the screen; when there is a signal, it cooperates with the level control to display a stable waveform;
(3) Television field (tv): used to display television field signals;
(4) Peak auto (p-p auto): When there is no signal, light traces are displayed on the screen; when there is a signal, a stable waveform display can be obtained without adjusting the level. This method is only used in some oscilloscopes (such as Caltek ca8000 series oscilloscopes).
