| Products > Test Equipment |
| finding short on motherboards with a shorty (with display) |
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| wacd:
I built this Shorty on breadboard it works relatively good but there is one thing that i don't understand. When i measure various shunt resistors it shows me strange results 0.0200R - 0.0189 0.0250R - 0.0245 0.0330R - 0.0333 0.0400R - 0.0430 0.1000R - 0.1100 Something wrong but i don't know what. |
| kripton2035:
did you build MY shorty-with-display with arduino nano, or the "clone" with ST controller ? the shorty-with-display is not a precision instrument, so the error is possible. it's only to measure relative to another point also I suspect the device to change the value when it becomes hotter with time. it could change values |
| Antonio90:
Hello, all results are within 5% tolerance, except the last one, which is 10%. What is the tolerance of the shunts? 5-10%? Even if the resistors are 1% the results are well within expected values for a continuity tester IMHO. |
| wacd:
I removed these shunts from laptop motherboards There is something about the results , its like a pattern for example -10 -5 -2 -0 +2 +5 +10 Sorry for not being able to explain myself i'm just a begginer at this kind of work and a complete stranger to the software side of the project. |
| wacd:
Yes its your version Kripton. It's a clone nano. MCU has Atmel writing on it. 328P. @Antonio90 All of them are %1 If i play around with these configs , i can get it to display the exact value of the resistor that i'm measuring. But when i change the resistor with a smaller or with a bigger value , it just does not measure it correctly. How can this be improved any suggestions? |
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