Oscilloscope beginner

Discussion in 'The Projects Forum' started by samuraimarc, May 20, 2009.

  1. samuraimarc

    Thread Starter Active Member

    Mar 28, 2009
    48
    0
    Hello all,
    I have an hp 141a oscilloscope with a 1401A dual trace amplifier and a 1420a time base plugin's. This is my first O-scope and have never used one before only seen it done a while ago. I'm trying to see the waveform of a pwm or the gating of a n-channel mosfet. I don't know where to start and I don't want to fry the scope.
    Is this scope capable of showing me this?
    what port do I plug into? ext. trigger? horziontal ext. trigger?
    N please help with the intial setup if possible.
    Thanks in advance for any help.
     
  2. RFactor

    Active Member

    May 1, 2009
    33
    3
    I woulld probably be impossible to fry your scope with what you are trying to look at assuming the voltages are well under 1000v on the mosfet. The probe should be going into ch1 input and set the voltage on ch 1 to max voltage and then bring it down until you see the waveform. You can then adjust the horizontal freq until you see the pulses.
     
  3. samuraimarc

    Thread Starter Active Member

    Mar 28, 2009
    48
    0
    yeah it's only 12v.
    Would channel 1 be channel A on the dual trace amplifier?
     
  4. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    Yes, there should also be a ground reference clip on the probe to hook to the ground common of the circuit to be measured. Also look for a DC/AC coupling switch on the O-scope and if there is one make sure you have it in the DC position.


    Lefty
     
  5. samuraimarc

    Thread Starter Active Member

    Mar 28, 2009
    48
    0
    Ok I tried all of that and eventually my trace line went away, I think the scope is junk. I found a different one at work and are able to get it to work fine.
    Thanks
     
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