Re: [SI-LIST] : Scope Queries (was Probing PCI...)

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From: Istvan Novak - Board Design Technology (inovak@pompom.east.sun.com)
Date: Wed Nov 24 1999 - 15:56:04 PST


Alastair,

Two types that come to my mind: Tektronix TDS794D, and TDS684B; and sure there
are several others.

Regards

Istvan Novak

SUN Microsystems

        Date: Wed, 24 Nov 1999 16:54:14 -0500
        From: Alastair Hardie <AHardie@compuserve.com>
        Subject: [SI-LIST] : Scope Queries (was Probing PCI...)
        To: "INTERNET:si-list@silab.eng.sun.com" <si-list@silab.eng.sun.com>
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        What digital scopes have an output connection at one of their analog
front
        end amplifiers?
        
        Also, does anyone have information about which scopes have one convertor
        for each channel (some use one for two channels) ?
        
        Regards,
        Alastair.
        
>if you are interested in the frequency response of your scope probe,
and
>have a vector network analyzer on hand, you can measure it easily. You
        also
>need a scope with sufficient bandwidth which has output connection at
one
        of
>its analog front end amplifiers (some digital scopes still have it).
        First
>you calibrate out the response of the scope by connecting VNA port1 to
the
>scope input directly and port2 to the scope analog output. Second, you
>connect your probe in series to this link, by connecting the robe
inputs
>across a 50-ohm termination of the vna port1 output, and the probe
output
>connected to the scope. You may see that simple homemade 1kohm probes
>easily can get a 3dB bandwidth up to 1-5GHz.
>
>thanks
>
>Istvan Novak
>SUN Microsystems
        
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Istvan Novak Sun Microsystems, Inc.
Istvan.Novak@Sun.Com Workgroup Servers, BDT Group,
                        One Network Drive, Burlington, MA 01803
                        Phone: (781) 442 0340

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