A Current Source for Picoammeter Calibration

Callegaro, Luca; D'Elia, Vincenzo; Trinchera, Bruno

doi:10.1109/tim.2007.900128

Cited by 25 publications

(27 citation statements)

References 8 publications

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“…Equation (2) shows that the traceability of the measurement of R is given by C, a timebase, and a voltage ratio; therefore, absolute voltage traceability is not required. The method here proposed is a derivation of a method developed for the calibration of lowcurrent meters [16], [21], where a proper traceability of the v in measurement was however necessary.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…The method allows to produce accurate dc currents in the range 100fA to 100pA and is insensitive to non idealities of the input stage of current amplifiers, such as voltage burden and finite input resistance. Currents can be generated with typical relative uncertainties in the 10 −5 range [14]- [16]; the performances of different measurement setups based on the method have been verified in an international intercomparison [22].…”

Section: Introductionmentioning

confidence: 99%

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Calibration Setup for Ultralow-Current Transresistance Amplifiers

Finardi

Callegaro

2018

IEEE Trans. Instrum. Meas.

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We describe a calibration setup for the transresistance of lowcurrent amplifiers, based on the capacitancecharging method. The calibration can be per formed in the current range of typical interest for elec tron counting experiments. The setup implementation is simple and rugged, and is suitable to be embedded in larger experiments where the amplifier is employed. The calibration is traceable to units of capacitance and of time. The base relative accuracy of the implementation is in the 10 −5 range.

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Section: Principle Of Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calibration Setup for Ultralow-Current Transresistance Amplifiers

Finardi

Callegaro

2018

IEEE Trans. Instrum. Meas.

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“…The range extender allows the generation of voltage ramps at V max = 100 V or higher 2 , having properties very similar to the original ramp at V max = 10 V already described in [3]. The noise of E is specified as 20 nVHz −1/2 at audio frequency.…”

Section: Methodsmentioning

confidence: 99%

“…1. The range extender amplifier E has a ×10 gain configuration, and is connected to the existing ramp generator RG [3] (having V max = 10 V).…”

Section: Measurement Setupmentioning

confidence: 99%

“…In most published generators [2], [3], [5], [7], T =100 s to 200 s and V max = 10 V, which in turn limits the maximum available current to 100 pA to 200 pA when S = 0.1 V s −1 and C = 1 nF. In one implementation [4] a maximum current of 1 nA has been reached at the expense of raising the current slope to S = 1 V s −1 , hence reducing the available measurement time to 20 s.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Reference DC Currents at 1 nA Level With the Capacitance-Charging Method

Callegaro

Capra

D'Elia

et al. 2014

IEEE Trans. Instrum. Meas.

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The capacitance-charging method is a wellestablished and handy technique for the generation of dc current in the 100 pA range or lower. This method involves a capacitance standard and a sampling voltmeter, highly stable devices easy to calibrate, and it is robust and insensitive to the voltage burden of the instrument being calibrated. In this paper, we propose a range extender amplifier, which can be employed as a plug-in component in existing calibration setups, and allows the generation of currents in the 1 nA range. The extender has been employed in the Istituto Nazionale di Ricerca Metrologica setup and validated with two comparisons at 100 pA and 1 nA current levels. The calibration accuracy achieved on a top-class instrument is 5 × 10 −5 at 1 nA.

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