6220/6221 DC and DC/AC Current Sources

The 6220 DC Current Source and Model 6221 AC and DC Current Sources combine ease of use with exceptionally low current noise.


In our effort to bring our customers the highest level of precision measurement capabilities, Fluke Calibration is proud to offer these precision metrology grade products from Keithley Instruments. Renowned as a leader in low-level precision electrical measurements, these selected Keithley products present an opportunity to help you further reduce uncertainties in your lab.

The 6220 DC Current Source and Model 6221 AC and DC Current Sources combine ease of use with exceptionally low current noise. High sourcing accuracy and built-in control functions make the Models 6220 and 6221 ideal for resistance measurements using the delta mode, pulsed measurements and differential conductance measurements. These 622X sources, when linked to the Model 2182A Nanovoltmeter, provide control with excellent measurement results for low-value, low-noise resistance measurements.

6220 and 6221

  • Source and sink (programmable load) 100 fA to 100 mA
  • 1014 Ω output impedance ensures stable current sourcing into variable loads
  • 65000-point source memory allows executing comprehensive test current sweeps directly from the current source
  • Built-in RS-232, GPIB, trigger link, and digital I/O interfaces
  • Reconfigurable triax output simplifies matching the application's guarding requirements
  • Delta mode enabling of 2182A Nanovoltmeter for ultra low-noise voltage and resistance measurement capability

6221 only

  • Source ac currents from 4 pA to 210 mA up to 100 KHz
  • Built-in arbitrary waveform generator with 1 mHz to 100 kHz at 10 msps update
  • Four user defined waveforms plus sine, square and ramp
  • Programmable pulse widths to 5 us for effective control of power dissipation




Technical Specifications*   6220 and 6221

 Ranges: 2 nA to 100 mA
 Min. Resolution: 100 fA
 Best Accuracy: 0.4% of reading +2 pA (1 Year)
 Output Resistance >10^14  Ohms
Typical noise (P-P)
 2 nA Range 400 fA
 200 ua Range 20 nA
 100 mA Range 10 uA
Programming resolution
 2 nA Range 100 Fa
 200 ua Range 10 nA
 100 mA Range 10 uA
Calibration Documentation Traceable calibration report included (no data); Z540.1 or 17025 accredited report optional
Program Memory  64K steps
Compliance Voltage  Bipolar from 0.1 V to 105 V in 0.01 V increments
Output Power  11W   (Source or Sink)
Remote interface  GPIB (IEEE-488.2) and RS-232C
SCPI (Standard Commands for Programmable Instruments)

Technical Specifications*   6221 dc / ac current source only

 Range 1 mHz to 100 kHz
 Accuracy +/- 100 ppm (1 year)
 Waveforms Sine, Square, Ramp, 4 user defined
Sine Wave Flatness  <1 db up to 100 kHz
Square Wave
 Overshoot 2.5% max
 Duty Cycle Variable settable to 1 us minimum
 Linearity <0.1% of peak output to 10 kHz



Model Name


6220-F DC Current Source
6221-F AC and DC Current Source
6220/2182A 6220 DC Current Soruce and 2182A Nanovoltmeter (Combined System)
6221/2182A 6221 AC/DC Current Source and 2182A Nanovoltmeter (Combined System)

Accessories common to all models:



237-ALG-2 Low-Noise Triax Input Cable
8501-2 6.6 ft (2 m) Trigger Link Cable for 2182A
CA-180-3A Ethernet Crossover Cable (6221 only)
CA-351 Communication Cable for 2182A
CS-1195-2 Safety Interlock Connector


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