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Accuracy of Current Source for Micro-Ohmmeter
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namster:
Hello ,
for my final years projet i have to release a Micro-Ohmmeter  with 4 Wires methods , i start with uncertainty Calculation , According to the calculations in 20m \$\Omega\$ Range and resolution of 1ยต \$\Omega\$ , the relative Error in Current have to be 0.01mA for 1A ,
Are my calculations correct ?
Vref ( 10Volt )
kony:
Direct measurement is quite poor choice both precision and SNR wise. This is usually done with AC excitation and synchronnous demodulator.
001:

--- Quote from: kony on December 23, 2018, 11:05:03 pm ---Direct measurement is quite poor choice both precision and SNR wise. This is usually done with AC excitation and synchronnous demodulator.

--- End quote ---

Do You mean bridge measurments?
kony:
Bridge measurement is orthogonal to that, but also helps.
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