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A traceable current source for the calibration of low-current meters (picoamperemeters, electrometers) in the 100 fA-100 pA current range is here presented. It is based on a low-frequency trapezoidal wave generator, measured with a sampling voltmeter, which charges and discharges a gas-dielectric capacitor. The generated current is traceable to units of voltage, capacitance and time. The source is...
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