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Groups > sci.electronics.design > #452770

Re: DS1054 LF common mode aberation

From Jon Elson <jmelson@wustl.edu>
Organization Washington University
Date 2017-03-20 14:31 -0500
Subject Re: DS1054 LF common mode aberation
Newsgroups sci.electronics.design
References <skqtcc1sja2tgg9jnnr06mh5shn7b3m5ld@4ax.com> <oan5s8$a1d$1@dont-email.me> <70ducchuupf1je8ikvovl9qq1t0sv2kdvs@4ax.com> <oap042$bkr$1@dont-email.me>
Message-ID <WoydnZr4c5Z_sE3FnZ2dnUU7-R2dnZ2d@giganews.com> (permalink)

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Frank Miles wrote:


> Tektronix scopes (most of them, specifically excluding those with isolated
> channels) have their input BNC outer shells solidly connected to common/
> sheet metal.

Oh, that USED to be true, in the "good old days".  Now, they use PC boards, 
and it leads to lots of ground currents flowing in one BNC shell and out on 
all the others.  You will see this on pretty much all the plastic shell Tek 
scopes, DPO, etc.

Jon

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Thread

DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-19 17:04 -0400
  Re: DS1054 LF common mode aberation Frank Miles <fpm@u.washington.edu> - 2017-03-19 23:56 +0000
    Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-19 22:21 -0400
      Re: DS1054 LF common mode aberation Frank Miles <fpm@u.washington.edu> - 2017-03-20 16:30 +0000
        Re: DS1054 LF common mode aberation Jon Elson <jmelson@wustl.edu> - 2017-03-20 14:31 -0500
  Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-19 22:31 -0400
    Re: DS1054 LF common mode aberation Phil Allison <pallison49@gmail.com> - 2017-03-19 20:11 -0700
    Re: DS1054 LF common mode aberation Jon Elson <jmelson@wustl.edu> - 2017-03-20 14:33 -0500
  Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-20 11:58 -0400
    Re: DS1054 LF common mode aberation George Herold <gherold@teachspin.com> - 2017-03-20 09:12 -0700
      Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-20 21:30 -0400
        Re: DS1054 LF common mode aberation Phil Allison <pallison49@gmail.com> - 2017-03-20 18:41 -0700
          Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-21 01:43 -0400
            Re: DS1054 LF common mode aberation Jon Elson <jmelson@wustl.edu> - 2017-03-21 17:04 -0500
          Re: DS1054 LF common mode aberation Jon Elson <jmelson@wustl.edu> - 2017-03-21 17:02 -0500
  Re: DS1054 LF common mode aberation Jon Elson <jmelson@wustl.edu> - 2017-03-20 14:28 -0500
    Re: DS1054 LF common mode aberation legg <legg@nospam.magma.ca> - 2017-03-20 21:36 -0400

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