Hmmm... isn't this the Dave Jones micro-current project?


Quoting IVP <joecolquitt@clear.net.nz>:
>
> Just read an article about a DMM adapter using the MAX4239ASA+
> chopper amp. 0.1uV offset typical, 2.5uV over the temperature range.
>
> Article claims resolution of 10pA on a 4.5 digit meter, 0.2% accuracy
>
> Unfortunately the circuit is not bidirectional
>
> http://parts.digikey.com/1/parts/1270799-ic-amp-low-noise-8-soic-max4239a=
sa.html
>
> Joe



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