| Products > Test Equipment |
| finding short on motherboards with a shorty (with display) |
| << < (14/37) > >> |
| cybermaus:
You have my support @kripton2035. Stay the course, lets get a few 5 digit ones in actual use before we start over complicating based on paper specs. |
| masterx81:
Any news about this? Had to repair a notebook with a ceramic mlcc cap shorted at 1.6ohm and i really tought that with shorty it would have taken much less time to spot it instead of constantly watching the display of the milliohm meter |O That sort of work that you do not too often but when you have to check dozens of caps on a mainboard can be really annoying. :-DMM |
| kripton2035:
I've received the pcb's. had to deal with a voltage regulator mcp1755s not working at all when in parallel with the arduino regulator. this took quite some time to figure out. rebuild the code to have a simple calibration procedure: you measure 0 ohm and 1 ohm and the calibration is done. now I only have some instabilities that are not on the prototype ( ! ) that makes the measure instable at "high" ohms you can measure in theory up to 7 ohms I also changed the constant current (that was not one) with a zener. we are almost there. will make a demo movie soon. |
| masterx81:
Good job! Quite interesting that on the prototype with flying wires on proto board all was stable, and with a proper pcb with good ground plane not :-BROKE In the mantime i need to source an accurate 1 ohm reference :P Most of the shorted things that i've found were under the 7 ohm (only few in the 30ohm range), so must be a good value. |
| kripton2035:
these : https://www.aliexpress.com/item/1005002205975393.html seems fine and enough for the purpose of this tool. I would like the tool to be able to measure up to 1-300Ω to handle any kind of situation but it would require a more capable adc. |
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