The Keithley 6220 DC Precision Current Source generates stable, highly accurate DC current from 100 fA to 100 mA with exceptional output impedance of 10¹⁴ Ω, enabling precise current delivery into varying loads. The instrument features low noise characteristics, adjustable voltage compliance from 0.1 V to 105 V in 10 mV steps, and an internal source memory of 65,000 points for executing complex current sweeps without external control. It operates in multiple sourcing modes: fixed DC level, memory list sequences, linear/logarithmic/custom current ramps, pulsed measurements, and Delta Mode for low-voltage and resistance measurement when paired with compatible nanovoltmeters. Model 220 emulation mode enables direct replacement of legacy current sources without application reprogramming.
Technical Specifications
Current Sourcing
• Source and Sink Range: 100 fA to 100 mA
• Output Impedance: 10¹⁴ Ω
• Source Memory: 65,000 points
Voltage Compliance
• Adjustable Range: 0.1 V to 105 V
• Step Resolution: 10 mV
Electrical
• Power Consumption: 120 VA
• Input Power: 100 V to 240 V rms, 50–60 Hz
Interfaces
• Remote Control: IEEE-488 (GPIB), RS-232C
• Digital I/O: Handler Interface with start/end-of-test control, 3 category bits, +5 V @ 300 mA supply
• Trigger Outputs: 1 trigger input, 4 TTL/Relay Drive outputs (33 V @ 500 mA, diode clamped)
• Trigger Link: Synchronization interface for instruments such as Model 2182A Nanovoltmeter
• Output Connections: Reconfigurable triax connector (Teflon insulated), DB-9 for trigger and digital I/O, screw terminals for CHASSIS and INTERLOCK (maximum 10 Ω external impedance)
Physical
• Cooling: Passive (no fan)
• Warm-up Time: 1 hour to rated accuracy
• Dimensions: 104 mm H × 238 mm W × 370 mm D
– Key Features
• Sourcing modes: Fixed DC, Memory List, Current Ramps (linear, logarithmic, custom), Pulsed Measurements, Delta Mode
• Model 220 emulation for legacy system integration
• Passive cooling design
– Typical Applications
Research and development, production testing, semiconductor characterization, nanotechnology research, superconductor testing.
– Compatibility & Integration
Direct compatibility with Keithley Model 2182A Nanovoltmeter via Trigger Link. GPIB and RS-232C interfaces enable integration into automated test systems. Handler Interface supports production test environments.
