Hi,
Attached is a simple current source for measuring DC resistance of small inductors (0-100mH). The constant current is 100mA and therefore max voltage is 100mV since I will be measuring up to 1Ω.
Using a 10-bit ADC with a Vref of 100mV would give me at least a resolution 1milliΩ. Having very little components on my PCB and waiting for any transients in the circuit to settle down, would it make this method suitable and immune to noise? If not what is the best alternative of amplifying. I will not increase the current as I plan to measure very small inductors.
The presented schematic actually worked when measuring with a DMM giving a resolution of 0.1mV.
Attached is a simple current source for measuring DC resistance of small inductors (0-100mH). The constant current is 100mA and therefore max voltage is 100mV since I will be measuring up to 1Ω.
Using a 10-bit ADC with a Vref of 100mV would give me at least a resolution 1milliΩ. Having very little components on my PCB and waiting for any transients in the circuit to settle down, would it make this method suitable and immune to noise? If not what is the best alternative of amplifying. I will not increase the current as I plan to measure very small inductors.
The presented schematic actually worked when measuring with a DMM giving a resolution of 0.1mV.
Attachments
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