Detect Low Currents in Nano/Pico Amperes

[Rising_Phoenix]

Hello everyone. I am looking for a practical method to detect very small currents in nano or pico amperes. Are there galvanotmeters or devices capable of doing that? Thanks a lot.

 

[jtbell]

Yes, there are such devices. See for example http://www.keithley.com/ and search for "picoammeter".

 

[Rising_Phoenix]

Thanks a lot. That is very helpful. Are there other devices that can measure small magnetic fluxes and very small variations in them? I would like to measure small changes in a magnetic flux without having to measure the induced AC current resulting from this
variation, since such picoammeters measure DC current. Thanks again.

 

[dmkelley]

Question.

What can you do if you need to make a floating measurement of such a small current? The commercial picoammeters only have a range of about 500V maybe 700V.