Piezo Crystal

Discussion in 'Homework Help' started by Steve1992, Sep 15, 2011.

  1. Steve1992

    Thread Starter Senior Member

    Apr 7, 2006
    When used as a clock in a circuit: microprocessor.
    Using an oscilloscope should I view the waveform by measuring across the crystal or with respect to ground?
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    Best answer is neither: your scope capacitance is going to change the circuit so what your measuring is different from what your circuit really is.

    If you measure across the cap you need to use two probes and subtract the inputs as generally you do not want to ground one end of the crystal.

    If you must measure the crystal measure each end to ground in two measurements