Thank to those who provided information I was able to successfully use 54003A input modules as 1 meg probe converter/extenders.
For my company the current COTS device was used to allow remotely using scope probes (like the Tek HP probes) at a distance from the test equipment, which also happened to have 50 ohm inputs. However I also wanted this capability in my home lab and didn't want to spend a lot of money.
The 54003A modules are available very inexpensively.? With a small +/- 10 volt supply and soldering on a 50 ohm coax cable these modules will very nicely allow high impedance measurements with 50 ohm instruments like spectrum analyzers, up to 300 MHz or so.
These can be had for under $30 shipped from the auction site.
IMHO a very useful device to have hanging around the lab. Especially for the money.
Peter
