This article compares two instruments for the traceable measurement of dc low currents, a custom capacitance-voltage (C-V) source and the ultrastable low-current amplifier (ULCA), a commercial precision transresistance amplifier. The instruments are calibrated through independent traceability routes. The comparison base relative accuracy is in the 10(-6)-10(-5) range. Differences between the two instrument readings, in the 10(-5) range, are interpreted as an effect of the frequency dependence of the capacitor employed in the C-Vsource. Such frequency dependence can also affect primary metrology experiments in other fields.

Comparison of Low DC Current Traceability Methods and Gas Capacitors AC–DC Dependence / Callegaro, Luca; Cassiago, Cristina; D'Elia, Vincenzo; Gasparotto, Enrico; Enrico, Emanuele; Gotz, Martin. - In: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT. - ISSN 0018-9456. - 70:(2021), pp. 1-6. [10.1109/TIM.2021.3053974]

Comparison of Low DC Current Traceability Methods and Gas Capacitors AC–DC Dependence

Callegaro, Luca
;
Cassiago, Cristina;D'Elia, Vincenzo;Gasparotto, Enrico;Enrico, Emanuele;
2021

Abstract

This article compares two instruments for the traceable measurement of dc low currents, a custom capacitance-voltage (C-V) source and the ultrastable low-current amplifier (ULCA), a commercial precision transresistance amplifier. The instruments are calibrated through independent traceability routes. The comparison base relative accuracy is in the 10(-6)-10(-5) range. Differences between the two instrument readings, in the 10(-5) range, are interpreted as an effect of the frequency dependence of the capacitor employed in the C-Vsource. Such frequency dependence can also affect primary metrology experiments in other fields.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/72976
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