High Power Source Measure Unit, High Capacitive (1A - 100fA, 200V - 0.2µV, 21W) 100µF Load Capacity for 4200A-SCS. The Keithley Model 4211-SMU is a high power (1 A, 20 W) instrument with increased low I stability. The Model 4200-SCS system can support up to nine high power SMUs. Measurement range: Current max.: 1A Voltage max: 210V Power: 21W Load Capacitive: 100µF Measurements: DC I-V Very low frequency C-V QSCV Measurement resolutions: 0.2µV, 100fA