Products > Test Equipment
RPL1116 (MSO1000Z) and PLA2216 (MSO5000) Active Logic Probe teardown
dren.dk:
Close inspection of the board file revealed that the problem was that I fucked up and overlapped the -2.5V and +4V zones so they ended up shorted.
The good news is that the MSO5k has a nicely robust set of power supplies for the LA probe, they survived the abuse just fine.
I've created a new board and I'm just waiting for another layout for the same order before sending it out.
The changes are:
* Fixed the Charlie plexing fuckup.
* Fixed the power rail short.
* Moved the parts away from the edge, so there's less risk of damage when depanelizing.
* Wired the ISP tracks out to the panel frame, so it's easy to program without fiddling with the annoying SOIC clip.
johnmx:
--- Quote from: dren.dk on March 22, 2019, 08:20:28 pm ---Close inspection of the board file revealed that the problem was that I fucked up and overlapped the -2.5V and +4V zones so they ended up shorted.
--- End quote ---
Always run the Design Rule Check before sending the design for production. Most people don't care about this tool, but I think it is essential.
I am only happy when it returns 0 errors.
thm_w:
--- Quote from: johnmx on March 22, 2019, 08:35:16 pm ---Always run the Design Rule Check before sending the design for production. Most people don't care about this tool, but I think it is essential.
I am only happy when it returns 0 errors.
--- End quote ---
Wow, that is wild that people would not care, it should be run as default function when generating gerbers. Of course the best is live DRC, but that is probably much harder to implement software wise.
Good to know it didn't blow the Rigol, but I'm thinking to add some 1A fuses on the 4V/2.5V rails, just in case.
dren.dk:
I certainly always run DRC before tapeout, but in this case it generated a single warning that didn't sound dangerous and when I went over the board I could not see any problems at all, so I figured that it was a false positive.
Good thing 4 layer boards are so cheap now, so it's only a 50 USD lesson:)
BTW: Someone warned against having decoupling caps on the bottom of the board because it would be too hard to assemble, but that was really not a problem at all.
voltsandjolts:
Maybe they meant it is more hassle for automated assembly and reflow - all components on one side would have to be glued in place?
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