Current range of 100fA to 100mA or 10pA to 1A Low current noise Stable current with up to 10^14 ohm output impedance RS-232, GPIB, Trigger Link, digital I/O interfaces Automated testing capability
Current range of 4pA to 210mA or 70µA to 5A Pulse mode Industry’s only low AC current source (6221) Difference conductance measurements (6221) Prevents electrostatic discharge (2520)