IIRC, the FFT is a seperate module from the RS232 module.
So, it is not worth the $$$$.

Kevin

On Mon, 20 Sep 2004, Mike Hord wrote:

> IIRC, the module for the TDS200 series scopes also adds FFT
> capability.  That may make it worth having as well.
>
> Check secondhand retailers and maybe Ebay.  Good luck!
>
> Mike H.
>
>
> On Sat, 18 Sep 2004 13:24:50 -0300, Mark <mark@cpovo.net> wrote:
> >
> >         I would like to build a RS232 interface to my TDS220 scope.
> >         Tektronix has the TDS2CM modules, but at ridiculous prices!
> >         Is there some schematics available?
> >
> >         Mark Jordan
> >
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