What is the TRIG.SOURCE button for?

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SUMMARY

The TRIG.SOURCE button on oscilloscopes is crucial for selecting the source of the trigger signal, which can be either internal or external. This functionality is essential for synchronizing the horizontal sweep of the oscilloscope with the input waveform, ensuring a stable display. In the context of Lissajous curves, the oscilloscope should be set to X-Y mode, bypassing the need for traditional triggering from channel 1 or channel 2. Understanding this feature enhances the effectiveness of frequency comparison experiments.

PREREQUISITES
  • Basic knowledge of oscilloscope operation
  • Understanding of trigger signal concepts
  • Familiarity with X-Y mode on oscilloscopes
  • Experience with Lissajous figures and their analysis
NEXT STEPS
  • Research the functionality of internal vs. external trigger sources on oscilloscopes
  • Learn how to configure X-Y mode on various oscilloscope models
  • Explore advanced techniques for analyzing Lissajous curves
  • Study the impact of trigger settings on waveform stability and display quality
USEFUL FOR

Electronics engineers, physics students, and anyone involved in waveform analysis and frequency comparison using oscilloscopes.

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This button as I far was informed is located on the oscilloscope. What is it for (my experiment is frequency comparison to find Lissajous curves)?
How does it look like (I have never noticed it).

Thanks
 
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On any instrument (pulse generator, scope etc) with a trigger the trig.source switch selects the source.

The source of the trigger signal may be internal or external.

On a two channel scope the usual arrangement is for a button to select between triggering from ch1 and ch2.

The idea of the trigger is to run the sweep across the screen in synchronisation with the signal to get a good steady display. So the rising input waveform is arranged to start (trigger) the beginning of the horizontal sweep.

You do not want this for lissajous figures - you use the scope in X -Y mode for that.
 
Last edited:
Oh thanks :) That was helpful
 

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