Reference Waveform, Saved stored reference waveform

Discussion in 'General Electronics Chat' started by watsongrey, Nov 9, 2014.

  1. watsongrey

    Thread Starter Member

    Oct 31, 2014
    Oscilloscopes have a function to store/save a reference waveform
    When would a technician want to save and store a reference waveform?
    I'm guessing it is used to compared it

    Also a Reference waveform at a amplitude and frequency can be injected into Ch2 and Ch1 will be probed on a circuits output or stage to measure the phase error/ phase shift

    What else have you guys seen that uses a Reference waveform? please list some examples of circuits or tests you have done that uses a Reference waveform
  2. vk6zgo

    Active Member

    Jul 21, 2012
    You've pretty much got it!
    Back in the day,if your service information didn't show waveforms,if you had a working unit of the same kind,you could run them both,& compare waveforms,either probing back & forth,or using two channels
    Of course,that only works that one time,so we would sometimes take photos of the 'scope display of the waveform from the reference unit for later use,or add hand drawn waveforms to the schematic.
    When digital 'scopes became available,it was possible to save the signal from the good unit for "reference".
    This is more of a "real-time " test,with no waveform storage.
    They would probably be variations on the above.
  3. watsongrey

    Thread Starter Member

    Oct 31, 2014
    This is more of a "real-time " test,with no waveform storage.

    yes true, can you guys think of any Reference waveform/signal to use on an unused oscilloscope channel for a real time test?
    The only time i have done this was to use a reference waveform on an unused oscilloscope channel was to test for phase error or phase shift.
    Ch1 is the reference waveform
    Ch2 is the waveform undertest or comparison waveform

    Thanks for you help and time