square wave

Discussion in 'The Projects Forum' started by Lezsalmon, Feb 1, 2011.

  1. Lezsalmon

    Thread Starter New Member

    Jan 26, 2011
    2
    0
    Hello, I am a newbee as far as electronics are concerned (so please be patient with me!).
    I have recently bought a Gould OS300 'scope. I built a circuit from a book which should produce a square wave. When I see the wave that is being produced, I only seem to get the top horizontal line and the bottom horizontal of the 'square wave showing'. I know my oscilloscope is a bit old and when I bought it, I was shown it working by the seller connecting a wave generator to it. Is this normal or am I mistaken in thinking I'm actually observing a square wave? Any help for this ancient novice would be appreciated!
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    I think that you have the volts/div knob in the wrong position.

    Take a look at this PDF how to use an oscilloscope:
    XYZ_of_oscilloscopes.pdf

    Bertus
     
  3. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Do the upper and lower lines go all the way across the screen? If not, you probably are failing to see the rise and fall times of the square waves because they move the electron beam much faster in the vertical direction than the horizontal direction. If you change the sweep speed to much faster and set your sync control properly, you should be able to see the rise time or fall time.
     
  4. Lezsalmon

    Thread Starter New Member

    Jan 26, 2011
    2
    0
    Hi, Ok, thanks, I will try both suggestions. Got to find the 'sinc control' now! Will let you guys know how I get on.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
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