Products > Test Equipment
finding short on motherboards with a shorty (with display)
kripton2035:
the shorty is not a precision device. what you need to measure is two relative points to see at less than a milliohm if the resistance is lower or higher between the two points. the absolute ohm value is not important, and not to be trusted to the last digit !
wacd:
Okay, thanks for the replies. I understand that it's not a precision device but it has very good components to be one, right? Maybe there is still room for improvement.
kripton2035:
I will see if I can find the good function for the devices you measured, but the current may be not constant for the measure so that's why the value is not linear compared to the resistors.
wacd:
Improvement on the software side would be good, what else can be done to make the circuit physically better than it is now? Constant current source maybe?
aeg:
Make sure to null out the probes before measuring shorty_measured_res, and again before making your confirmation measurements.
If that's not good enough, change "Rx = Rx * calibration_factor;" to "Rx = (Rx + 0.039) * 0.916;" for linear two-point calibration.
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