Electronics > Repair
HP 34401a DMM with leaking segments
HighVoltage:
I have a broken 34401A with a bad VFD laying around, would be nice to test !
qu1ck:
bitseeker
I considered a graph but decided against it (at least for now) because 1) 64 pixels vertical resolution makes a graph not that useful and 2) display does not support horizontal scrolling so I would have to refresh big poligon every time. I'm not sure if I have time budget between text refreshes for that.
HighVoltage
Are you asking for firmware? If you want to reproduce this experiment I can provide wiring diagram and a binary. Source is not ready for public yet.
bitseeker:
--- Quote from: qu1ck on June 26, 2018, 09:38:57 pm ---bitseeker
I considered a graph but decided against it (at least for now) because 1) 64 pixels vertical resolution makes a graph not that useful and 2) display does not support horizontal scrolling so I would have to refresh big poligon every time. I'm not sure if I have time budget between text refreshes for that.
--- End quote ---
I was partly joking, but for future exploration, a higher resolution screen might make it feasible. The need for hardware scrolling is a good point. It's fun thinking about the possibilities.
qu1ck:
High resolution has drawbacks too, either big pixel density (single pixel line not visible from typical distance) or big size and definitely price. Also you will have to go back to lcd most likely so add low contrast to the list.
I even thought of doing the whole thing on esp8266 and stream data to any mobile device/pc. Then you can have any graphs you want. But that is also a lot of software to write and I'm in this business for the rosin smoke lol. When I publish the protocol maybe someone else will do it. Esp8266 has probably enough speed for it.
Although another reason I didnt start with esp is I didnt want a rf antenna inside the metal can that is 34401a generating lots of reflections and affecting measurements god knows how.
Sent from my moto g(6) using Tapatalk
TiN:
qu1ck
Awesome works, keep it up.
Extra thumbs-up for making (or planning) to make it open to community.
I'd love to have similar one for my Keithley 6485 and 2182A here, which use UART datalink to FP too. :-+
Hate ugly single-line Keithley VFD. :--
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version