O scope purchase

Discussion in 'General Electronics Chat' started by Bobstein, Apr 24, 2013.

  1. Bobstein

    Thread Starter New Member

    Apr 24, 2013
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    I have the opportunity to purchase an o scope the owner says that it powers on and a dot moves across the screen. Does that indicate that the unit will work?
     
  2. nigelwright7557

    Senior Member

    May 10, 2008
    487
    71
    No.

    I bought a second hand scope that the second channel read off the wrong voltage.

    You need to try all channels with a signal generator.
     
  3. Bobstein

    Thread Starter New Member

    Apr 24, 2013
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    0
    Thanx Nigel
     
  4. tindel

    Active Member

    Sep 16, 2012
    568
    193
    If a dot is moving across the screen, then that indicates that the horizontal amplifier is working at low frequencies. At high frequencies - the dot should look like a straight line.

    You can check if the vertical amplifier is working by placing your finger on the probe tip and looking for a messy sine wave at about 16.6ms (60Hz).

    You can't really check calibration unless you have a waveform generator that's calibrated.
     
  5. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    many scopes have a square wave generator available on the front panel for calibrating probes. Just connect a probe to it and you should see a square wave on the screen. You'll have to play with the controls a bit to see the wave.
     
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