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Keithley launches two current source devices

Posted: 21 Jul 2004 ?? ?Print Version ?Bookmark and Share

Keywords:keithley instruments? model 6221? ac/dc current source? model 6220? dc current source?

Keithley Instruments Inc. released its Model 6221 ac/dc current source and Model 6220 dc current source.

According to the company, the Model 6221 is the only ac current source available on the market. It also provides better accuracy, consistency, reliability, robustness and cost effectiveness than "home-made" solutions, it added. The product is also claimed to be the only commercially available current source waveform generator, which simplifies creating and outputting complex waveforms. Pulse widths as short as 5Micro;s can be programmed, and the instrument supports pulsed I-V measurements.

The models 6220/6221 feature ease of use and low current noise. High sourcing accuracy and built-in control functions make the devices suitable for various applications such as Hall measurements, resistance measurements using delta mode, pulsed measurements and differential conductance measurements.

Both current sources are fully programmable via the front panel controls or from an external controller via RS-232 or GPIB interfaces, with the Model 6221 also featuring an Ethernet interface for remote control. Both instruments can source dc currents from 100fA to 100mA, while the Model 6221 can also source ac currents from 1pA to 100mA, with 10MHz output update rate. The Model 6221 also features built-in standard and arbitrary waveform generators with 1mHz to 100kHz frequency range.

Both models offer tools for defining current ramps and stepping through predefined sequences of up to 64,000 output values using a trigger or a timer. They support linear, logarithmic and custom sweeps.

When used with the company's Model 2182A Nanovoltmeter, both the Model 6220 and Model 6221 measure resistances from 10 milliohms to 1 gigaohm. Used in this way, the Model 6221 acts as a high performance alternative to AC resistance bridges and lock-in amplifiers for measuring resistances and coordinates pulsing and measurement with pulse widths as short as 50?s.

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