1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Oscilloscope trigger homework problem

  1. Jan 14, 2009 #1
    Here is the problem.

    The first answer is 2.5V, but I'm having trouble getting ωt

    I'm using the equation: V = V0 sin(ωt) --> 2.5V = 5V sin(ωt) --> sin-1(2.5V/5V) = ωt --> ωt = 30 degrees but that's incorrect and so is -30 degrees

    I've just used an oscilloscope for the first time last week, and I don't know much about it. What does changing the trigger slope polarity affect in this case? Apparently the scope still triggers at 2.5V... please shed some light on me!
     
  2. jcsd
  3. Jan 14, 2009 #2
    A positive trigger at 2.5 volts means that scope should trigger on a rising part of the waveform as it reaches 2.5 volts. Negative trigger means it will trigger on a falling part.

    It still triggers at 2.5 volts. But the waveform is falling.
     
    Last edited: Jan 14, 2009
  4. Jan 14, 2009 #3
    Assuming Vo is equal to Vpeak then dividing the trigger voltage by Vpeak and finding its sine [ sin(Vt/Vo) ] will give you the phase angle.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Oscilloscope trigger homework problem
Loading...