OT(?) : HP1630D Logic Analyser

On Thu, 13 Oct 2011 08:04:52 +0200 Wolfgang Eichberger <oe5ewl at gmail.com> wrote: In 1998 I got may hands on a Dolch Logic Instruments LAM4850A logic analyzer. -- Without pods, das usual. I phoned the support of the company and eventually a kind person emailed me the pinout of the pod connectors. Basicly it was -5.2 V and 5 V ECL / TTL supply voltage, threshold voltage, GND and four differential ECL inputs for the signals. I ordered the last dozend TTL to ECL level shifter ICs that a supplier had in stock and build my own pods. Now I am limited to (LS)TTL imput levels, but that is all I need. Maybe somthing similar is possible for the HP units. BTW: I am looking for active probes for my HP 54720D DSO. I have three 54712A Y-plugins with fixed 50 Ohm inputs. Probes like the 54701A are available, but to expensive at around US$ 150. I can build something myself, but I need schematics. Designing somthing that can do an impedance transformation fom 1 MOhm to 50 Ohm at DC to at least 1 GHz is far bejond my skils. -- \end{Jochen} \ref{http://www.unixag-kl.fh-kl.de/~jkunz/}