The Source meter is designed specifically for test applications that demand tightly coupled sourcing and measurement. It provides precision voltage and current sourcing as well as measurement capabilities. The instrument is both a highly stable DC power source and a true instrument-grade 5-1/2 digit multimeter. The power source characteristics include low noise, precision and readback. The multimeter capabilities include high repeatability and low noise. The result is a compact, single-channel, DC parametric tester. In operation these instruments can act as a voltage source, a current source, a voltage meter, a current meter and an ohmmeter.
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Manufacturer's Website: http://www.tek.com/keithley-source-measure-units/keithley-smu-2400-series-sourcemeter