Keithley 6220 DC Precision Current Source

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.