I put a 60 kΩ sensing resistor plus low-bias current amplifier with a gain of 500 into an aluminium bag and tied it to AGND for EMI shielding. The second stage is an ADS1256 24-bit ADC. The purpose is to try to get a lower noise level during extremely low current measurements. I would like to implement it all on a PCB. What kind of Faraday cage is suitable for this?
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