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Pico Ammeter Combines 500V Source With Femto Amp Resolution

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Addressing the growing need for performing low dc current measurements on devices that also require stimulation, the Model 6487 pico ammeter measures current down to 20 fA and includes a voltage source up to 500V. Using the source voltage in a current-measure topology and an alternating voltage method to minimize background current errors, the 5-1/2 digit instrument provides direct readout of resistances up to 5 x 10E16?. Voltage source ranges are ±10, ±50, and ±500 Vdc with a basic accuracy of ±0.1%. A time-stamped, 3,000-reading data buffer gives minimum, maximum, and standard deviation statistics on all measurements. Other features include a data acquisition rate of 1,000 readings, REL and LOG functions, scaled voltage analog output, one-touch front-panel control, on/off display light for light-sensitive component testing, and digital I/O capabilities. The instrument comes with EceLINX, an add-in utility for Excel, and an instrument driver for use with development environments including LabVIEW, LabWindows/CVI, Visual Basic, C/C++, and TestPoint. Price is $2,995. KEITHLEY INSTRUMENTS INC., Cleveland, OH. (888) 534-8453.

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