[quote author="Larrchild"]Something like this:
http://cgi.ebay.co.uk/USB-I%2FO-Data-Acquisition-Control-+-Standalone-Operation_W0QQitemZ190237219497QQcmdZViewItem?IMSfp=TL0807161032a5517
...would be more flexible for future projects, is cheap and will probably work with any of the curve tracer apps out there I have seen. So, the audio card mod is fine, but it is a purpose-built device. Buying one of these USB pods and running different apps will get you addicted to virtual test gear, lol.
I use a pci card but I took all my older test gear and gave it computer interfaces.[/quote]
There's sure something to be said for that route, especially if you're 'doing' more than one or two.
Had a look at something like that to replace/use the X/Y-plot-functionality of an old HP audio analyzer. I forgot what the showstopper then was.
Alternative is to use HP-IB (/GP-IB) for the boxes that have it, I have the hardware (but not the justification/inclination of setting up / writing drivers / debugging etc).
A colleague
has that knowledge & spirit, but no applications
Regards,
Peter