Connect with us

Crystal oscillator 15pF load

Discussion in 'General Electronics Discussion' started by CommanderLake, Nov 14, 2019.

Scroll to continue with content
  1. CommanderLake

    CommanderLake

    199
    6
    Oct 2, 2012
    How can one verify a crystal oscillator has a 15pF load if any kind of testing equipment such as a scope probe adds capacitance to it, it seems impossible to verify the waveform without modifying it?
     
  2. bertus

    bertus Moderator

    1,599
    632
    Nov 8, 2019
    Hello,

    What schematic do you use?
    For what application is the oscillator?

    Bertus
     
  3. CommanderLake

    CommanderLake

    199
    6
    Oct 2, 2012
    I have a Connor-Winfield OH4610LF-024.576M
    Its not a question relating to any particular application, the datasheet says 15pF nominal load so hypothetically how does one verify such a small load if a scope probe tip is 15pF?
     
  4. bertus

    bertus Moderator

    1,599
    632
    Nov 8, 2019
    Hello,

    With the 15 pF load, you probably mean the test circuit in the datasheet:

    cx259_test_circuit.png
    The load is only there to show the driver capability.
    Measuring the output to show the rise and fall times of the signal.

    Bertus
     

    Attached Files:

  5. CommanderLake

    CommanderLake

    199
    6
    Oct 2, 2012
    Page 3, parameter Load: 15pF nominal.
    How is it possible for one to validate such a small load?
     
  6. majoco

    majoco

    50
    8
    Nov 10, 2019
    IMHO the load affects the waveform - 50ohms load makes the output into s a sine wave, 15pF might preserve a square wave shape.
    As in most things - one test is worth a thousand opinions. ;)
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-