Electronics > Repair
HP 34401a DMM with leaking segments
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justanothername:
After a long time a quick update.
I now got myself one of these cheap replacement VFDs from aliexpress. If someone needs the oled display i built, please send me a private message, maybe we can figure something out.
qu1ck:
Just wanted to note, I'm still open to help you or anyone else with newer meter and some free time to resolve incompatibility with current firmware. Since I only have an older meter I can't do it myself. I would like to see logic analyzer dumps of SPI bus to start.
justanothername:

--- Quote from: qu1ck on July 14, 2019, 11:25:26 am ---Just wanted to note, I'm still open to help you or anyone

--- End quote ---

Thank you for the offer! The thing is: I got paranoid. I've been watching how the voltage reading of the meter was changing when the case was unscrewed. Then I thought about the extra two clocked devices (cpu @ 8mhz and oled @ i dont know) I was about to put into the housing.
I know it is bullshit and will not affect the precision, but I did shit my pants and went with the replacement vfd.
I'm very sorry.
coromonadalix:
I do have recent hardware front pcb's in my two 34401a meters, but i dont have the logic analyser thing ....  :(   never used such tools :(
qu1ck:
Get yourself cheapo analyzer, any hobbyist should have one in their tool kit.
https://www.ebay.com/itm/USB-SALEAE-24M-8CH-Logic-Analyzer-24M-8-Channel-FPGA-debugging-tool-With-buffer/173828458153?hash=item2878fbc6a9:g:E6kAAOSw56Fc0-yt

It's supported by open source software sigrok/pulseview: https://sigrok.org/wiki/Downloads
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