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rectification qustion

Discussion in 'Electrical Engineering' started by malcolm walker, May 16, 2004.

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  1. When i measure the input and output of a bridge rectifier using a two
    channel oscilloscope i loses the negative cycle of input and negative cycle
    of out.

    The input signal is supplied by a frequency generator about 10 volts, 100 Hz
    and used 1N4005 diodes.

    Could someone explain why the negative cycle is killed off when i connect
    the scope lead to the output of the bridge rectifier.
     
  2. Hi Greg what is happening is that i am lossing the negitave side on the
    input and the negitave side is missing from the positive side of the output
    i.e. showing only have wave rectification.
     
  3. DarkMatter

    DarkMatter Guest

    One of the elements contained in the bridge is/has opened, or the
    bridge is not configured correctly.
     
  4. jriegle

    jriegle Guest

    The ground of the scope channels is common and you are shorting out 1/2 of
    the wave. Diagram this and you can see why. If the current is strong enough,
    you may have cooked a diode. If you still get a full wave on the output with
    the scope leads removed from the input, it is okay.
    John
     
  5. Ben Miller

    Ben Miller Guest


    Either the bridge is wired wrong, or you have a bad diode in the bridge that
    is shorting the input on the negative half of each cycle. This prevents it
    from showing up on the output as well.

    Ben Miller
    [/QUOTE]
     
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