Weekend-project:
Autoranging microvoltmeter based on the MSP430FR4133 launchpad.
ADC used: MIcrochip MCP3422, an 18bit, 3.75 sample/second Sigma Delta with 2 differential inputs. I2C interface
This nice little chip contains a programmable amplifier (x2,x4,x8) and a not-too-bad internal reference of 2.048V.
Max input range is +/-2.048V, resolution (8x amplified) is 2uV.
Hand-etched a single layer PCB which goes on top of Launchpad.
Type K cable in hot water: 2.93mV, 73Kelvin temp difference to ambient
compare with my Fluke 289, 0.06% (datasheet says 0.05% typical, 0.35