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| Keithley 7700 Multiplexer card |
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| MarkKruetzmann:
Hi! I am tempted to buy a Keithley 2750, but I would like to equip it with some scanner cards as well if I do. As they are quite expensive while being mostly relais and connectors, I wondered whether it would be possible to recreate the versatile 7700 by DIY means. I did search for photos of the internals or even a schematic, but nothing came up despite a ROM dump and the relais type and manufacturer. Is there someone with a 7700 or similar and would like to share some pictures of it, especially the used chips? Also, it would be interesting to know which connector they use for interacting with the meter. This question is - for now - more out of curiosity, but might be useful for future me or others. Interesting it will be anyway. Mark |
| kilobyte:
The 7700 uses a bunch of standard 4094 shift registers to control the relais, so noting special. So there is no microcontroller on it but a small eeprom to store the card ID and the relay cycle counters. there is a full Partlist in the 2700 Servicemanual, but sadly no schematic. I have two 7700 Cards so I can take some highres photos. |
| MarkKruetzmann:
That'd be great! Some high res photos of both sides with the chips and their markings would be very useful. And maybe detailed shots of the connector and sizes of everything. |
| kilobyte:
Here are some pictures of the 7700 card. Because the card doesn't use any microcontroller or some other special parts it should be possible to design a DIY Mux Card. I only had the PCB rules at hand so maybe I can measure some dimension at the weekend. |
| Kleinstein:
Somewhere in the thread about the DMM6500 there is some extra info and AFIAR even hints on a DIY solution. I am however not sure if the cards are the same. |
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