Very low accurate DC current measurement?

[bobcat1]

Hi

for a new design, I need to mesure dc current pulse; pulse duration is in the range of 10msec and up to 900 msec and continus current in the 10 ~ 100 uA range

Can any one can please advice on how to measure very low DC current (uA range) accuretly to 0.1 ~ 0.25%

Any circuit ,schematic,application note,idea - wellcom

Thanks

Bobi

 

[FvM]

A basic parameter is the permissible voltage drop at the measurement circuit. A passive shunt is generally the most simple circuit, an OP I/V converter may be used if a voltage drop can't be tolerated. There are also options for a floating or isolated current measurement.

It's also unclear, if you simply want to monitor the current waveform or need to extract a parameter, e. g. average pulse current or area. A basic limitation for measurement resolution is from noise, but you most likely can stay far away from noise limited operation with the required rather slow measurement.