oscilloscope

Discussion in 'General Electronics Chat' started by dukeman, Feb 11, 2009.

  1. dukeman

    Thread Starter Member

    Feb 7, 2009
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    0
    Hi,
    I have two questions:
    1. I just bought an old analog scope. Do you know any electronic projects out there that teach how to test scopes?
    2. Can you also please tell me some reliable online electronic parts places?

    Thanks,
    Dukeman
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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  3. dukeman

    Thread Starter Member

    Feb 7, 2009
    13
    0
    Hi Ken,
    I am in the States.

    Thanks,

    Dukeman
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Mouser, Jameco, Digikey, Radio Shack (in an emergency ;) ), MPJA, Allied, Newark, Allelectronics... are some.

    Ken
     
  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    A good test for the oscilloscope AND your probes is the Calibrator thingamajigger. Attach your probe to that and see that you've got a really CLEAN square wave. The vertical amplitude should match what your gain controls say. The frequency should be really close to 1KHz as well, so you can test your time base.

    If it's a dual trace scope, but the two inputs in a DIFFERENTIAL mode..this is by putting the trace in the ADD mode and polarity reverse in one channel (most scopes let you do this on the B channel. Connect both probes to the calibrator test point and see that you have a straight line....if you do, your amps are well matched.

    If you have two sine wave generators, put one in the X channel and one in the Y and play with Lissajous patterns. You should be able to get a nice clean circle with 90 degree phase shift and a clean diagonal line with 0 phase shift.

    If there is a Z axis input, you might want to see if that works too. If you're really a mad scientist, you can put video in there, horizontal sync into the X channel, vertical sync in the Y channel, and make a TV set out of the thing.

    (Yes, even electronics techs have slow days!)

    eric
     
  6. bertus

    Administrator

    Apr 5, 2008
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