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Oscilloscope Trigger Controls
15 questions By Tony R. Kuphaldt
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Question 4 of 15
On this oscilloscope, identify the location of the trigger level control, and explain what it does:
Reveal answer
Notes:The location of the knob should be easy for students to determine. More difficult perhaps is the explanation of the knob’s function.
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Question 5 of 15
Suppose an oscilloscope has been set up to display a triangle wave:
The horizontal position knob is then turned clockwise until the left-hand edge of the waveform is visible:
Now, the point at which the waveform triggers is clearly visible, no longer hidden from view past the left-hand side of the screen:
What will happen now if the trigger level knob is turned clockwise? How will this affect the positioning of the waveform on the oscilloscope screen?
Reveal answerThe waveform will shift to the left as the trigger level is raised:
Notes:There is nothing special about a triangle wave here. To be perfectly honest, it was the easiest waveform for me to draw which had a sloping edge to trigger on!
By the way, for students to really understand how triggering works, it is important for them to spend time “playing” with an oscilloscope and a signal generator trying things like this. There is only so much one can learn about the operation of a machine by reading!
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Question 6 of 15
Suppose an oscilloscope has been set up to display a triangle wave, with the horizontal position control turned clockwise until the left-hand edge of the waveform is visible:
Then, the technician changes the slope control, changing it from “increasing” to “decreasing”:
Draw the waveform’s new appearance on the oscilloscope screen, with the slope control reversed.
Reveal answerThe waveform will begin at the same voltage level, only on the “down” side instead of on the “up” side:
Notes:There is nothing special about a triangle wave here. To be perfectly honest, it was the easiest waveform for me to draw which had a sloping edge to trigger on!
By the way, for students to really understand how triggering works, it is important for them to spend time “playing” with an oscilloscope and a signal generator trying things like this. There is only so much one can learn about the operation of a machine by reading!
response are clear, thank you