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why i cannot read 37kHz clock on any board with Hantek 2x20MHz

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  • khaahk
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Ground probe on GND and signal measured on capacitor near crystal, but it should not make any difference, they are close to each other. You are adding extra capacity to the circuit with the probe but it should not affect the measurement at 32KHz, even with x1 probe. Eevblog has good video on x1/x10 probe differences.
    https://www.youtube.com/watch?v=OiAmER1OJh4

    Leave a comment:


  • ktmmotocross
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Originally posted by khaahk View Post
    Something like that:
    thats righ on one leg of crystall or on kbc pin?

    Leave a comment:


  • pecrie
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    @ktmmotocross ,

    If you have a dmm that also can measure frequency , you can at least check
    if you have some signal from the X-tal.

    I tried today with my dmm - and it gave me a reading of about 21 Khz.
    So , I know that there is a fequency coming out.I don't know what the real frequency must be.

    I didn't measure how much volt it is , though.

    Leave a comment:


  • khaahk
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Something like that:
    Attached Files

    Leave a comment:


  • ktmmotocross
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Originally posted by pecrie View Post
    Are you sure that there is a 37Khz signal from the X-tal ?
    And what is the voltage of the 37Khz ?

    What is the sensitivity of your oscilloscope input ? Microvolts or millivolts ?
    Are you measuring on a test point on the motherboard ?
    thats why i need picture of this clock on scope to know how it looks when it is ok

    Leave a comment:


  • pecrie
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Are you sure that there is a 37Khz signal from the X-tal ?
    And what is the voltage of the 37Khz ?

    What is the sensitivity of your oscilloscope input ? Microvolts or millivolts ?
    Are you measuring on a test point on the motherboard ?

    Leave a comment:


  • khaahk
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    If the probe is at x10 position then it should work.

    Leave a comment:


  • ktmmotocross
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Originally posted by khaahk View Post
    Maybe using probes x1 instead of x10?
    have two 60MHz probes with switching 1x/10x


    can anybody upload a foto with ociloscope with this clock?

    Leave a comment:


  • khaahk
    replied
    Re: why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    Maybe using probes x1 instead of x10?

    Leave a comment:


  • why i cannot read 37kHz clock on any board with Hantek 2x20MHz

    I try to make check if i have 37kHz on any board. have cheap Instrustar 2x20MHz

    I cannot measure that if i have signal or not.

    When i run online generator from audio card it can measure its 20khz without problem. So how to measure if this frequency is ok ?
    Last edited by ktmmotocross; 03-27-2021, 04:25 AM.
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