4. Technology#

The JS220+ leverages new components and techniques to achieve nanoamp accuracy. The improvements include:

  • Improved guard traces for reduced leakage.

  • Replaced the 18 µA current range selection MOSFET for one with lower gate-source leakage.

  • Redesigned analog front-end for lower input bias current and better temperature stability.

  • Redesigned anti-aliasing filter for improved temperature stability.

  • Redesigned ADC reference and level shift for improved temperature stability.

  • Redesigned voltage ESD solution, dramatically reducing leakage currents.

  • Migrated to Rogers 4003C PCB material for both the main PCB and front panel PCB. Rogers 4003C has 1000x higher resistivity than FR4 for significantly reduced current leakage.

JS220+ front panel with safety banana jacks

JS220+ back panel with GPIO, USB and trigger connectors