Compute the measurement of the oscilloscope

Discussion in 'Homework Help' started by SilverKing, Jul 4, 2015.

  1. SilverKing

    Thread Starter Member

    Feb 2, 2014
    72
    0
    Hi everyone.

    I've a problem I need help to solve it. The problem states:
    "An instrument (oscilloscope) is prepared to measure a sinusoidal periodic wave, compute the measurement error if the same instrument is used to measure the wave indicated in figure 1
    [​IMG]

    (The wave is much more like a sawtooth wave, sorry for bad drawing)

    Actually, I don't how to start, should I assume that sinusoidal wave is 4V peak (from 6V to 10V above, and 6V to 2V below) and substracting the values?

    [​IMG]
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    2,803
    1,237
    What characteristic of the signal are you measuring? Distortion (and, hence, 'error') will be a function of the instrument's input bandwidth and sweep linearity -- neither of which are stipulated in the 'problem'...:confused:

    Best regards
    HP
     
  3. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    What does it mean to "prepare an oscilloscope to measure a sinusoidal wave"?

    What does it mean to "measure" a waveform?
     
  4. SilverKing

    Thread Starter Member

    Feb 2, 2014
    72
    0
    It turns out that the solution lies in the 'k' factor - which Vrms over Vavg -, and every oscilloscope is designed with k equal to 1.11 (sinusoidal wave 0.707/0.632), so to solve this problem, I've to determine both the Vrms and the Vavg of the triangular wave and compute the error with respect to the default k (1.11).
     
  5. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    This makes even less sense than the rest of the problem description you've provided. For a sinusoidal waveform Vavg is identically zero, making your 'k' value infinite.
     
Loading...