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Component Signiture Analysis

Discussion in 'General Electronics Chat' started by Huttojb1, Aug 21, 2017.

  1. Huttojb1

    Huttojb1 Member

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    Hey All

    I have a component signiture Analsist machine at work and when measuring a capacitor it displays a circle like signiture.

    Depending on frequency it can turn into an oval shape. Although I have been explained on why the signiture is a circle like signiture, I don't fully believe it's the true explaination.

    I have done research on the internet and it demonstrates how the signiture is a circle for capacitance but doesn't ever give a reason or explaination.

    Can anyone here help.

    Jason.
     
  2. Les Jones

    Les Jones Well-Known Member

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    Are you sure that it is not just an oscilloscope connected in X Y display mode showing phase shift. As in the first line of pictures on this web page. This type of display is called a Lissajous pattern. A circle is produced when the phase shift is 90 degrees. With 50 Hz (Mains frequency) if you connect a capacitor and resistor in series and the capacitor has the same value of reactance as the value of the resistor then a circle is displayed with the Y axis showing the voltage across the resistor and the X axis showing the voltage across the capacitor. (0.1 uF and a 33K resistor will do this at 50 Hz)

    Les.
     
  3. Huttojb1

    Huttojb1 Member

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  4. dave

    Dave New Member

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  5. Huttojb1

    Huttojb1 Member

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    This isn't the tool I have but it shows an example of the signitures

    Jason
     
  6. Les Jones

    Les Jones Well-Known Member

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