Additional Features: Autoranging Digital Calibration Baseline Correction Interface: GPIB Input port: BNC triaxial connector Isolated 100V Voltage Source The Keithley 617 Programmable Electrometer is our latest and most advanced electrometer. It is a sensitive, versatile, 41/2-digit, 7-function instrument which includes a bipolar 100V voltage source, a decade current source, IEEE-488 interface, and outstanding low current accuracy specifications.