Part 3 in the Precision Current Source series.
Dave breadboards a classic precision low current source circuit using the 10V REF102 voltage reference to generate accurate 1mA and 1uA currents.
Also some talk about the errors in a typical precision circuit like this.
Part 2 HERE
Part 1 HERE
Dave shows how to search for cheap 6.5 digit bench multimeters on Ebay and other ...