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We report on the development of a novel highly linear voltage ramp generator to be used for the traceable calibration of picoamperemeters. The generator is based on two digital-to-analog converters, one of them being used to compensate for the differential nonlinearity of the other one. The generator is completely controllable by a computer, its voltage slope dV/dt is adjustable between 1 and 1000 mV/s. During a ramp running between -10 and +10 V, the slope shows a relative variation of only 1.3 middot10-5 (relative standard deviation). Due to a small output filter time constant of only 10 ms, we are, for the first time, able to conduct dynamic measurements of picoamperemeters with no sacrifice of linearity.
Instrumentation and Measurement, IEEE Transactions on (Volume:58 , Issue: 4 )
Date of Publication: April 2009