Keithley 220 Programmable Current Source The 220 Programmable Current Source is a current source with full range current from 2 nA to 100 mA. Incorporates a selectable voltage compliance of up to 105 V in 1 V increments. The 100 memory locations allow up to 100 storage points for programming source, V-limit, and dwell time. Can be used with any measurement system that uses the IEEE-488 interface bus or operated via the front-panel. Manufacturer's Standard Accessories Triaxial Test Lead (3 ft) [6011] Instruction Manual