Oscilloscope Vs Current waveform

Discussion in 'Homework Help' started by Eddy boy, Mar 29, 2009.

  1. Eddy boy

    Thread Starter Member

    Nov 19, 2008
    11
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    Can we connect the probes of Oscilloscope is series with a AC circuit to see the current wave? Will the Oscilloscope shows current graph like it shows voltage wave graph ?:confused:
     
  2. AlexR

    Well-Known Member

    Jan 16, 2008
    735
    54
    The simple answer is NO.
    The input impedance of the probe in X1 mode is 1megohm and when its switched to X10 its 10megohm. Also one side of the probe is at earth potential.
    Oscilloscopes are designed to display voltage only.

    The more complex answer is that you can get a current probe for an oscilloscope that uses a Hall effect device to sense current and convert it into a voltage for display, but they are very expensive and somewhat difficult to use.
     
  3. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    Or you can wire a low ohm series resistor to the circuit you wish to observe and measure the voltage drop across the resistor. Special attention has to be given to isolating the scope from ground if you attempt that method as the ground clip on the scope probe is normally connected to AC ground on most scopes.

    Lefty
     
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    If a differential probe isn't in the budget (usually not for a hobbyist), It is usually more desirable to use a 2 channel scope with channel 2 in ADD/INVERT mode, and both grounds connected to chassis.
     
  5. Eddy boy

    Thread Starter Member

    Nov 19, 2008
    11
    0
    Thanx to all...
     
  6. Eddy boy

    Thread Starter Member

    Nov 19, 2008
    11
    0
    The most comprehensive anwer was given by AleXR,but can u tell me the approx prize of current probe and how it looks like...? like ordinary probe?
     
  7. AlexR

    Well-Known Member

    Jan 16, 2008
    735
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