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Frequency/Period Detection

2005-11-22
2013-04-29
  • Karl Hiramoto

    Karl Hiramoto - 2005-11-22

    I have a screen shot of a 50Hz signal but xoscope shows 10K Hz.  Aparently there is a 10K Hz noise on top of the 50K Hz

    http://karl.hiramoto.org/temp/xoscope-wrong-freq.png

    Should I file a bug report?

     
    • Tim Witham

      Tim Witham - 2005-11-23

      Why are you showing channel 1 but measuring channel 2?  We can't see the signal being measured.  Since it has almost zero deflection (5 samples high) I doubt it is valid to be taking any measurements from it.  If you wish to measure the displayed channel 1 instead, then hit 1 to select it, and it will be measured.

      Even then, the measurements might be great, as described in LIMITATIONS of xoscope(1):
             The automatic measurements count zero crossings and divide to determine
             the frequency and period.  If these zero crossings are not  "regularly-
             periodic", these measurements could be invalid.

       
      • Karl Hiramoto

        Karl Hiramoto - 2005-11-23

        Thanks for pointing that out.

         

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