Keithley 6221: Pros And Cons, Common Issues, And Best Places To Purchase

Keithley 6221 Information

The Keithley 6221 is a low-noise precision AC/DC current source with a wide range of features and capabilities. It is ideal for a variety of applications in research and development, as well as in production environments.

Introduction

The 6221 combines ease of use with exceptionally low current noise. It is the only low-current AC source on the market that can be programmed to generate both basic waveforms (sine, square, triangle, and ramp) and customizable waveforms with an arbitrary waveform generator (ARB) that supports defining waveforms point by point.

The 6221 also features a built-in sourcemeter function, which allows it to be used to measure current and voltage simultaneously. This makes it ideal for applications such as Hall measurements, resistance measurements using delta mode, pulsed measurements, and differential conductance measurements.

Specifications

The 6221 has a source current range of ±2nA to ±100mA and a source voltage range of ±100mV to ±40V. It has a typical current noise of 0.1nA (rms) at 1mA and a typical voltage noise of 10µV (rms) at 10V. The 6221 has an output power of 11W.

Features

  • Low-noise precision AC/DC current source
  • Built-in sourcemeter function
  • Arbitrary waveform generator (ARB)
  • Wide range of current and voltage ranges
  • Low current noise
  • High output power
  • Easy to use

What's in the box

The Keithley 6221 comes with the following items:

  • 6221 current source
  • Power cord
  • User manual
  • CD-ROM with software

Image of Keithley 6221 current source

Applications

The Keithley 6221 is ideal for a variety of applications, including:

  • Hall measurements
  • Resistance measurements using delta mode
  • Pulsed measurements
  • Differential conductance measurements
  • Semiconductor device characterization
  • Nanotechnology research
  • Superconductor research
  • Production testing

Pricing

The Keithley 6221 has a list price of $2,995.00. However, it is often available for a lower price from authorized dealers.

Conclusion

The Keithley 6221 is a versatile and powerful current source with a wide range of features and capabilities. It is ideal for a variety of applications in research and development, as well as in production environments.

Keithley 6221 Compare with Similar Item

a table comparing the Keithley 6221 to some similar items:

FeatureKeithley 6221Keysight 34420ATektronix 370C
Current range100 µA to 100 A10 µA to 10 A1 µA to 10 A
Voltage range0 to 200 V0 to 100 V0 to 100 V
Accuracy±0.01%±0.005%±0.02%
Noise0.1 nA0.05 nA0.1 nA
Waveform generationSine, square, triangle, ramp, arbitrarySine, square, triangle, ramp, arbitrarySine, square, triangle, ramp
InterfacesGPIB, RS-232, USBGPIB, LAN, USBGPIB, LAN, USB
Price$2,500$3,000$3,500

As you can see, the Keithley 6221 is a high-accuracy, low-noise AC/DC current source with a wide range of features. It is also relatively affordable. The Keysight 34420A and Tektronix 370C are both similar products, but they are more expensive than the Keithley 6221.

Here is a summary of the key differences between the three products:

  • Accuracy: The Keithley 6221 is the most accurate of the three products, with a ±0.01% accuracy. The Keysight 34420A and Tektronix 370C have accuracies of ±0.005% and ±0.02%, respectively.
  • Noise: The Keithley 6221 also has the lowest noise of the three products, with a noise of 0.1 nA. The Keysight 34420A and Tektronix 370C have noise levels of 0.05 nA and 0.1 nA, respectively.
  • Price: The Keithley 6221 is the most affordable of the three products. The Keysight 34420A and Tektronix 370C are both more expensive.

Ultimately, the best product for you will depend on your specific needs and budget. If you need the highest accuracy and lowest noise, then the Keithley 6221 is the best choice. If you are on a budget, then the Keysight 34420A or Tektronix 370C may be a better option.

Keithley 6221 Pros/Cons and My Thought

The Keithley 6221 is a precision source measure unit (SMU) that is well-suited for a variety of applications, including circuit testing, device characterization, and research. It features a wide voltage and current range, high accuracy, and low noise.

Pros:

  • Wide voltage and current range: The 6221 can source or measure voltages from ±100 mV to ±40 V and currents from ±2 nA to ±100 mA. This makes it suitable for a wide range of applications.
  • High accuracy: The 6221 has a typical accuracy of ±0.005% of reading plus 1 digit. This makes it a good choice for demanding applications where high accuracy is required.
  • Low noise: The 6221 has a typical noise level of 2 nV/√Hz at 1 MHz. This makes it a good choice for applications where low noise is important.
  • Built-in functions: The 6221 includes a number of built-in functions, such as source/measure, compliance testing, and IV curve tracing. This makes it a versatile tool for a variety of applications.
  • User interface: The 6221 has a user-friendly interface that makes it easy to use. The display is clear and easy to read, and the controls are well-organized.

Cons:

  • Price: The 6221 is a relatively expensive SMU. However, its high accuracy, low noise, and wide range of features make it a good value for users who need a high-performance SMU.
  • Size and weight: The 6221 is a relatively large and heavy SMU. This may be a drawback for users who need a portable SMU.
  • Limited software: The 6221 comes with a limited software package. Users who need more advanced software features may need to purchase a third-party software package.

User reviews:

Overall, users of the Keithley 6221 are very positive about the instrument. They praise its accuracy, low noise, and wide range of features. Some users have noted that the price is high, but most users feel that the 6221 is a good value for the price.

My thoughts:

The Keithley 6221 is a high-performance SMU that is well-suited for a variety of applications. It is accurate, low-noise, and has a wide range of features. However, it is also relatively expensive and large. Overall, I think the 6221 is a good value for users who need a high-performance SMU.

Here are some additional thoughts on the Keithley 6221:

  • The 6221 is a good choice for users who need a high-accuracy SMU. Its typical accuracy of ±0.005% of reading plus 1 digit is better than most other SMUs in its price range.
  • The 6221 is also a good choice for users who need a low-noise SMU. Its typical noise level of 2 nV/√Hz at 1 MHz is comparable to other high-end SMUs.
  • The 6221's wide range of features makes it a versatile tool for a variety of applications. The built-in functions, such as source/measure, compliance testing, and IV curve tracing, can save users time and effort.
  • The 6221's user interface is clear and easy to use. The display is large and easy to read, and the controls are well-organized.
  • The 6221's size and weight may be a drawback for some users. It is larger and heavier than some other SMUs in its price range.
  • The 6221's limited software package may also be a drawback for some users. Users who need more advanced software features may need to purchase a third-party software package.

Overall, I think the Keithley 6221 is a good value for users who need a high-performance SMU. It is accurate, low-noise, has a wide range of features, and is easy to use. However, it is also relatively expensive and large.

Keithley 6221 Problems and Solutions

some common issues and problems with the Keithley 6221 and their solutions, as reported by experts:

  • The display is blank. This can be caused by a number of things, such as a loose connection, a dead battery, or a problem with the display itself. To troubleshoot, check the connections to the display, replace the battery, and contact Keithley support if the problem persists.
  • The instrument is not responding to commands. This can be caused by a number of things, such as a loose connection, a problem with the software, or a problem with the instrument itself. To troubleshoot, check the connections, restart the software, and contact Keithley support if the problem persists.
  • The measurements are inaccurate. This can be caused by a number of things, such as a loose connection, a problem with the probe, or a problem with the instrument itself. To troubleshoot, check the connections, calibrate the probe, and contact Keithley support if the problem persists.
  • The instrument is not saving data. This can be caused by a number of things, such as a loose connection, a problem with the software, or a problem with the instrument itself. To troubleshoot, check the connections, restart the software, and contact Keithley support if the problem persists.

Here are some additional tips for troubleshooting Keithley 6221 problems:

  • Check the user manual. The user manual often contains troubleshooting tips for common problems.
  • Use the Keithley 6221 diagnostic software. The diagnostic software can help you identify and troubleshoot problems with the instrument.
  • Contact Keithley support. If you are unable to troubleshoot the problem yourself, contact Keithley support for assistance.

I hope this helps! Let me know if you have any other questions.

Keithley 6221 Manual

Safety Information

  • The Keithley 6221 is a high-voltage and high-current device. Always exercise caution when using it.
  • Do not connect the 6221 to a circuit that is not properly protected.
  • Do not operate the 6221 outside of its specified voltage and current ranges.
  • Do not touch the output terminals of the 6221 while it is powered on.
  • Use the proper safety equipment when using the 6221, such as eye protection and gloves.
  • Follow all safety instructions in the 6221 manual.

Before Use

  • Read the 6221 manual carefully before using it.
  • Make sure that the 6221 is properly connected to a power source.
  • Set the output voltage and current ranges of the 6221 to the desired values.
  • Connect the 6221 to the circuit you want to test.

Troubleshooting

  • If the 6221 is not working properly, check the following:
    • Is the 6221 properly connected to a power source?
    • Are the output voltage and current ranges set correctly?
    • Are the probes connected properly?
    • Is the circuit you are testing properly configured?
  • If you are still having problems, contact Keithley Technical Support.

Maintenance

  • The 6221 requires very little maintenance.
  • Periodically clean the exterior of the 6221 with a soft cloth.
  • Do not use harsh chemicals or solvents to clean the 6221.
  • If the 6221 is not going to be used for an extended period of time, disconnect it from the power source.

Warranty

The Keithley 6221 is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase. If the 6221 fails during the warranty period, Keithley will repair or replace it at no charge.

Contact Information

  • Keithley Instruments, Inc.
  • 2875 Lakeview Ave.
  • Cleveland, OH 44117
  • USA
  • Phone: 1-800-553-1734
  • Fax: 1-216-431-1497
  • Website: https://www.keithley.com

Additional Information

  • The 6221 can be used with a variety of software packages, including Keithley Measurement Suite and MultiSim.
  • The 6221 can be used to measure a variety of electrical parameters, including voltage, current, resistance, and capacitance.
  • The 6221 can be used to generate a variety of waveforms, including DC, AC, and pulse waveforms.
  • The 6221 can be used to perform a variety of test functions, such as compliance testing and swept source measurements.

I hope this manual has been helpful. If you have any further questions, please contact Keithley Technical Support.

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