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    The Math

    I know this is a simple question but can someone help explain this?


    Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division: Click image for larger version. 

Name:	sin wave.png 
Views:	64 
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ID:	316

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    Quote Originally Posted by Ronwilson1801 View Post
    I know this is a simple question but can someone help explain this?


    Determine the RMS amplitude of this sinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division: Click image for larger version. 

Name:	sin wave.png 
Views:	64 
Size:	5.1 KB 
ID:	316

    The thicker lines in the middle that split the graph into quadrants are the 0 lines, representing voltage (horizontal) and time (vertical). The wave peaks just above the second horizontal line up from the middle, if the lines are 0.2 volts each, then the peak is a little over 0.4 volts. If you look very closely there are 5 diving lines per division (0.2 / 5 = 0.04), so closer to 0.44 volts peak.

    To find RMS, take the peak value and multiply by 0.707. In this case 0.44 x 0.707 = 0.31108.

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