title: Constant-current supply of 3 ppm stability and resettability; application for a SQUID.
abstract: We describe a new design for a constant-current supply which is stable and resettable to 3 ppm over a period of one week, even in the presence of ambient temperature changes of several degrees. These characteristics are achieved by utilizing a digital-to-analog converter for providing a changeable, yet extremely stable, reference voltage. Seven full-scale current ranges are available between 0.1 and 100 mA. It is also shown that this constant-current supply is suitable even for use with a SQUID, meeting all of the exacting requirements for such use.
authors.affiliation: Department of Physics, Bar-Ilan University, Ramat-Gan, Israel.
authors.forename: B
authors.initials: B
authors.lastname: Levy
authors.forename: A J
authors.initials: AJ
authors.lastname: Greenfield