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Scope or Design Problem

Discussion in 'General Electronics' started by Aaron, Aug 10, 2004.

  1. Aaron

    Aaron Guest

    Hello,

    I have a very simple circuit that is giving me trouble. I have a
    transformer coverting 120 VAC to 9.8VAC I then take one lead from the
    9.8 VAC output side and connect a 1N4937 Diode to it followed by a 330
    Ohm resister and the connect the other end of the resistor to the
    opsite side of the Transformer (see below)


    |------------A----(->|-)---B--( 330 Ohm Resistor )---C-|
    9.8 VAC |
    |------------------------------------------------------|

    If I were to Connect a Ocilloscope to Point A I should see a sine
    wave (of 60 HZ).

    If I connect to point B I should see only the positive Half of the
    sine wave

    If I connect to point C I should see the Entire Sine wave


    THe problem that I have is when I connect to point B I see the entire
    sine wave. I have tried 6 different diodes with the cathode in both
    directions. and still get the same results. I am using a HP54602A
    Scope. Is there something wrong with my scope or am I just not doing
    something correct?

    Thanks for the input
     
  2. Bob Stephens

    Bob Stephens Guest

    Put the probe tip on point B and the probe's reference lead on point C and
    see what you get.
     
  3. SolarWind

    SolarWind Guest


    Another try:

    Clip the scope prob "ground clip" on "C", hook the prob tip on "C"
    too:
    1. If you see 0V line only, the prob may be ground OK!
    2. If you see sinewave on scope, that means you got bad ground wire,
    or broken wire in ground clip, use ohmmeter to measure the wire.
     
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