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

Indeed, but with a 1000:1 probe that becomes a +/- 2000 volt input range which is sufficient.

That was a work requirement and their solution covers more, although this would be sufficient for them too.

Peter

On 2/21/2025 10:25 PM, Jeremy Nichols via wrote:

Peter, didn’t you have some high-voltage requirements for your application? Looks like the 54003A is limited to +/- 2 Volts, after whatever reduction the probe provides. (Just curious. I missed the last couple of days of discussion.)?

Jeremy?

On Fri, Feb 21, 2025 at 7:07?PM Peter Gottlieb via <hpnpilot=[email protected]> wrote:

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