One Ampere Current Supply Stable to One Part per Million per Hour
Michael W Retsky, J.S. Wall · Review of Scientific Instruments · 1972
A 1 A current supply stable to better than 1 ppm/h is described. The technique uses a standard feedback circuit, but many practical problems had to be solved to achieve the high stability. Details concerning a 10−3 °C stability oven, a 1 ppm/h variable reference voltage, and a 1 ppm/°C power resistor are given.