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Advice on affordable USB oscilloscope

Discussion in 'Electronic Equipment' started by [ Frank ], Mar 20, 2007.

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  1. [ Frank ]

    [ Frank ] Guest

  2. Honestly, I think the 200kHz sample rate is wayyyyyy toooo slow. ;-) I
    think that if you look around, you can find yourself a nice chinese DSO for
    about twice the money. Something like this maybe:
    http://cgi.ebay.co.uk/RIGOL-DIGITAL...ryZ45008QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

    I just bought the DS1102C and I really like it. Believe me it blows that
    USB scope away with 400 million samples per second and a 1MB buffer depth.
    Plus it comes with a 3 year warranty.
     
  3. [ Frank ]

    [ Frank ] Guest

    Anthony Fremont ha scritto:
    It's 445¤ (the version including 16channel Logic Analyzer)
    Anyway, seems a very good instruments.
    Thanks
     
  4. The logic analyzer adds allot to the price at least on the model that I
    bought. It added 50% to the price, so I didn't get that option.
    These are fairly inexpensive, but I don't know anything about them:
    http://cgi.ebay.co.uk/OWON-PORTABAL...40224QQcategoryZ45008QQtcZphotoQQcmdZViewItem

    Larger screen and battery options, lower sampling rate, but still miles
    ahead of the USB scope. I went with the Rigol because they make one of
    Agilent's low-end scopes and I liked the features.
     
  5. John E.

    John E. Guest

    Larger screen and battery options, lower sampling rate, but still miles
    Description says:
     
  6. They sample it over multiple cycles and combine them. If the signal
    isn't repeating identically it doesn't work. "equivalent sample rate"
    is a BS spec; if I *had* a repeating signal I would be using the analog
    scope anyway. My advice is to ignore it and pay attention to the 400.
     
  7. Exactly.
     
  8. Lionel

    Lionel Guest

    The first figure is for continuous sampling over a time period, & the
    second figure is for sampling with skewed timing offsets over multiple
    time periods. Eg; it might take 10 samples over one cycle at X+0%,
    then another 10 samples from the next cycle at X+5%, etc, resulting in
    finer detail, but with the risk of aliasing.
     
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