Andrea-
Depending on the requirements there are several vendors of differential
amp-probes. For quick and dirty testing like you mentioned look at this:
https://www.quantasylum.com/content/Products/QA190.aspx For less than $100 and
including a current clamp (AC only) it’s a good deal. QA has a number of tools
(scope, source, audio analyzer) that are very high value.
There are other diff probes. A Google search will find a lot of options
depending on whether you are looking for high gain or high voltage, but they
start at around $500. They have replaced the older model of the preamp + probes
it seems.
Demian
> Hello Mark.
>
> Yes, the AM502 is the thing I am searching, but they are not very
> cheap for a 1977 vintage, in particular adding the mainframe.
>
> It's possible that in 38 years no maker did anything like?
> Looking better, all other modules I saw aren't equipped with front
> panel output, because are in effect vertical oscilloscope amplifiers
> and thus the output is on the backplane. And they are not cheap also.
>
> Best regards,
> Andrea Baldoni
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