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

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From: Alastair Hardie (AHardie@compuserve.com)
Date: Wed Nov 24 1999 - 13:54:14 PST


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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