Hi all,
are you interested in the HP4401A? It´s a plug-in-card for the HP3852A Acquisition system.
The HP4401A contains the "HP Multi-Slope II conversion technique" which is also used in the HP3457A, HP3468A and HP3478A. Because of that it contains a lot of similar components.
HP used a nice shielding foil for isolation of analog and digital parts.
I´m sure many of you realize the circuits.
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Too many pictures! You have to visit my Website:
https://www.richis-lab.de/HP44701A.htmGerman as usual but ask me in here whatever you want to know.
In my view the most interesting facts are:
- It seems they used different "key-pictures" for different dies.
- In my view the slope switch would be able to support seven steps.
- They integrated a strange overvoltage protection in the second hybrid...