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Advice on Gould DSO please...

Discussion in 'Electronic Repair' started by storan4wd, Aug 30, 2007.

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  1. storan4wd

    storan4wd Guest

    I have just got a Gould 465 DSO (same as 420 & 450 but 100MHz
    bandwidth).

    With the input grounded the trace is never dead straight (as with an
    analogue scope) but exhibits a very, very tiny amount of vertical
    noise. It doesn't alter with channel sensitivity and is the same on
    both channels, so I'm guessing it's due to ADC error. Everything else
    about the scope works perfectly.

    It's livable with but if anyone can tell me whether this is normal
    behaviour for these scopes (or other DSOs in general) I'd appreciate
    it.

    Bob
     
  2. N Cook

    N Cook Guest

    If its invariant noise then surely it must be noise on the final "Y" stage
    supply rail. Try adding a HV electrolytic to see if it has any effect.
     
  3. Charles

    Charles Guest

    Yes, they seem to have those problems. Mine is a Tek and I wish I had never
    purchased it.
     
  4. storan4wd

    storan4wd Guest

    Thank you for the suggestion, I see where you're coming from but
    everything else on screen (menus, grid, measurements etc.) are all
    rock solid. I therefore suspected that the problem did not lie in the
    deflection system.

    Bob
     
  5. storan4wd

    storan4wd Guest

    Thank you Charles, now I can relax. If Teks do it it must be OK! Or
    maybe we've both got faulty scopes? ;)
    Really appreciate your helping me.

    Bob
     
  6. Charles

    Charles Guest

    You are most welcome.

    I'll share a bit more. I retired and moved and had to convert to the
    smaller stuff (I loved my old boat-anchor analog scopes). I wanted to
    maintain some laboratory capabilities and thus purchased a TEK THS730A. It
    works, but I really miss my analog scopes. I actually hate the damned thing
    .... for the same reason you mentioned and others as well.

    There are better digital scopes now available, but being retired (limited
    income and lab space), I am sort of screwed.

    Charles
     
  7. storan4wd

    storan4wd Guest

    ... but being retired (limited

    I'm with you all the way! It's better than working though!

    Bob
     
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