Connect with us

Modern digital oscilloscopes question

Discussion in 'Electronic Basics' started by eatmorepies, Dec 12, 2011.

Scroll to continue with content
  1. eatmorepies

    eatmorepies Guest

    Hello

    I worked in a place that gave me access to budget, non memory 20MHz CRT
    scopes - I no longer work there. They were perfect for my needs.

    Six years on and I find I need an oscilloscope, the market seems to have
    changed. Are those cheap digital models any good?

    I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be
    nice, it's not for radio work.

    I found things like this...

    http://www.rapidonline.com/Tools-Eq...399/?sid=2e6f6286-b98a-4994-b9ce-0631e8fc6b4d

    Decent for the money? Or to be avoided?

    John
     
  2. Phil Allison

    Phil Allison Guest

    "eatmorepies"

    ** Not so good for service work, particularly audio service.

    If you like using analogue scopes, stick with one.

    Analogue scopes are easy to use and tell you no lies.

    The opposite is true for digital ones.



    .... Phil
     
  3. Phil Allison

    Phil Allison Guest

    "George Herold"

    Yeah but an analog 'scope can't average.

    ** So fucking what ?

    Put that together with the digital filters on the front end of the
    Rigol

    ** Shame there are no analogue ones.

    Shame how the scope keeps showing things that are not at the input - like
    aliasing products, noise and signals that have stopped seconds ago.

    These are fatal flaws in audio servicing.


    .... Phil
     
  4. Phil Allison

    Phil Allison Guest

    "George Herold"
    I'll post some 'scope shots tomorrow.


    ** FFS dickwad - I own a bloody Rigol !!!

    Oh I agree, But the cost would be out of control.


    ** Not to mention the scope would then finally,y actually have
    INTENTIONALLY varying bandwidth with sweep setting.

    This is the biggest LIE about DSOs and why analogue scopes are SOOOOO much
    better for troubleshooting analogue circuits.


    Oh DSO's aren't for every task.


    ** FFS read the bloody CONTEXT !!

    Here it is again - you RETARDED BIRD BRAIN !!


    " I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be
    nice, it's not for radio work.

    ** Not so good for service work, particularly audio service.

    If you like using analogue scopes, stick with one.

    Analogue scopes are easy to use and tell you no lies.

    The opposite is true for digital ones."



    .... Phil
     
  5. Bob Masta

    Bob Masta Guest

    <Shameless plug>
    How about a cheap analog scope, supplemented by a
    ridiculously-cheap (US$29) Windows sound card scope for
    audio work?

    Sound cards don't do DC (without mods or external help), but
    the "audio" range keeps creeping up... these days you can
    get to nearly 96 kHz (192 kHz sample rates) even on cheap
    built-in sound chipsets.

    With the proper software (hint, hint!) you can get fancy
    triggering, including negative trigger delay, hysteresis,
    hold-off, etc. You can get real-time FFT spectrum analysis
    (with optional peak tracking), and color spectrograms.

    Synchronous waveform averaging allows stupendous noise
    reduction... you can easily extract signals that were
    totally buried in noise. See for example:
    <http://www.daqarta.com/dw_wavg.htm>

    Best of all, you get a signal generator that can create
    almost any signal you want, with modulation including AM,
    FM, PM, Burst, and Sweep on up to 4 independent streams per
    stereo output channel. It can drive all your tests, and
    provide the sync for the averaging as well. See:
    <http://www.daqarta.com/dw_gen,htm>

    (Actually, the generator is free. Even if you stick with
    only an analog scope, or a cheap DSO, you will find plenty
    of uses for the signal generator.)

    Lots of other features, like a frequency counter that can
    read low frequencies quickly with high precision (due to
    reciprocal period methods). True RMS measurements. Sound
    level (SPL) meter (if you have a calibrated microphone).
    Histograms, including post-stimulus time histograms.

    The $99 Pro version allows you to write macros to run
    automated test sequences, allows custom spectrum response
    limits for pass/fail production testing, and supports remote
    control from custom software.

    Best regards,


    Bob Masta

    DAQARTA v6.02
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
    Pitch Track, Pitch-to-MIDI
    Science with your sound card!
     
  6. Fred Abse

    Fred Abse Guest

    I have one of these. Only problem is the 1MHz B/W. Has been useful.though.
     
  7. Fred Abse

    Fred Abse Guest

    I know it isn't tubes, but whaddabout your 610C?
     
  8. Jamie

    Jamie Guest

    I still have 2 HP RF volt meters I use, good for 1 ghz that are tubes
    and has a chopper motor in the back :)

    Jamie
     
  9. Fred Bartoli

    Fred Bartoli Guest

    George Herold a écrit :
    Did once a 10^11 GBW preamp (100K-1MHz) with a 200pV/rtHz input noise
    down to 1.5nV/rtHz at 0.1Hz, has 140dB CMRR and still quite a lot (don't
    remember the figures) at 1MHz, a few years ago.
    It also show no thermal tail so that you can look at the nV level errors
    right after a 10V blast.

    Maybe I should sell it too?
    Wonder what the market for this could be...
     
  10. Fred Abse

    Fred Abse Guest

    Schooling should be a gradual process ;-)

    I still use an HP vector voltmeter.
     
  11. Fred Abse

    Fred Abse Guest

    A rare ability in this age of "lead people by the hand".
    Give me knobs and switches over menu-driven crap every time ;-)
    I intend to keep putting up with mine.
     
  12. Fred Abse

    Fred Abse Guest

    You, me, both.
     
  13. Les Cargill

    Les Cargill Guest


    http://www.imdb.com/title/tt0084917/quotes

    Walt: Daddy what's gradual school?
    T. S. Garp: What?
    Walt: Gradual school. Mommy say's she teaches at gradual school.
    T. S. Garp: Oh Gradual school is where you go to school and you
    gradually find out you don't want to go to school anymore.
     
  14. Les Cargill

    Les Cargill Guest

    The original novel was from John Irving, who most seem to
    have forgot, and is always striking to read. Throw the
    original "Forrest Gump" on there, too.
     
  15. Guest

    I figured it out before I went that far. Then I went back because I was being
    paid to go. I gradually came to the conclusion that I wasn't being paid
    enough. ;-)
     
  16. Fred Abse

    Fred Abse Guest

    But how often is that necessary?

    I seldom need more than 3
     
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

-