Products > Test Equipment

finding short on motherboards with a shorty (with display)

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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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