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DSO vs. Analog Scope for 1Hz signals

Discussion in 'Electronic Basics' started by [email protected], Dec 4, 2012.

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  1. Guest

    Hi all,

    Is there a way to examine slow clock pulses (around 1Hz)and supply rails for switching spikes or other instabilities using an analog scope? I've triedusing my 350Mhz Tek but it just seems hopeless for this kind of thing - unless there's an obscure setting or work-around for this kind of measurementthat I'm not aware of?

    tia!
     
  2. Fred Bartoli

    Fred Bartoli Guest

    Phil Hobbs a écrit :
    Well, I guess that if you wander around some of the bikini contests with
    a Rigol onto your shoulder, you'd have a pretty good success :)
     
  3. Fred Bartoli

    Fred Bartoli Guest

    Phil Hobbs a écrit :
    Oh, I never wear it on my shoulder :)
     
  4. With a tee shirt that reads,
    "Flirt Harder!
    (I'm a geek and mostly clueless)"

    To the OP you might look at Bob Masta's sound card software... (Well
    OK the response of the sound card at 1 Hz will be pretty poor... but
    it should do the edges ok.)

    George H.
     
  5. Bob Masta

    Bob Masta Guest

    On Tue, 4 Dec 2012 12:44:36 -0800 (PST), George Herold

    Thanks, George. You are correct: The sound card's AC
    coupling typically rolls off below a few Hz, but edges are
    just fine.

    As it happens, I'm putting the final touches on some new
    macros to allow reading pulse width and duty cycle. (And
    frequency or period, of course, but Daqarta's Frequency
    Counter can already do that.) They'll be in v7.20, out in a
    week or so. I'll post a note here.

    Best regards,


    Bob Masta

    DAQARTA v7.10
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, Pitch Track, Pitch-to-MIDI
    FREE Signal Generator, DaqMusic generator
    Science with your sound card!
     
  6. Phil Allison

    Phil Allison Guest

    <>

    Is there a way to examine slow clock pulses (around 1Hz)and supply rails for
    switching spikes or other instabilities using an analog scope? I've tried
    using my 350Mhz Tek but it just seems hopeless for this kind of thing -
    unless there's an obscure setting or work-around for this kind of
    measurement that I'm not aware of?


    ** As you do not state what it is you are trying and failing to see - I can
    only guess at the problem.

    The scope will not synch ?

    You cannot see the pulses cos they are too short ?

    You cannot see the rise and fall times ?

    Far as examining DC rails goes, try using AC coupling and stop the time
    base, leaving only a spot on the screen - this will allow you to
    dramatically increase the vertical gain and see even very brief glitches.


    .... Phil
     
  7. whit3rd

    whit3rd Guest

    Well, there's an obscure work-around all right. It's a Polaroid camera with a hood
    that clamps onto the oscilloscope. Makes hardcopy, and everything.
     
  8. Bob Masta

    Bob Masta Guest

    Hmm, that "week or so" got dragged out a bit, but Daqarta
    v7.20 has finally been released.

    When you first start Daqarta there will be a pop-up message
    that mentions "mini-app" macros and how to activate them.
    The relevant one here is Pulse_Meter, which is activated via
    F8 followed by U keys. (Or CTRL+F8 and select from list.)

    It shows frequency, pulse width, and duty cycle for both
    input and output channels, via 4 color-coded meters.
    Right-click any meter to go to Help for this mini-app, which
    discusses how to customize, add data-logging, etc.

    Enjoy!


    Bob Masta

    DAQARTA v7.20
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, Pitch Track, Pitch-to-MIDI
    FREE Signal Generator, DaqMusic generator
    Science with your sound card!
     
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