Yoawaret Pimsut, S. Bauer, M. Kraus, Ralf Behr, M. Kruskopf, O.F. Kieler, L. Palafox
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引用次数: 0
Abstract
The four-terminal-pair impedance bridge using pulse-driven Josephson voltage standards at PTB has been fully automated. The same bridge configuration was employed to determine R:R and C:C ratios over the frequency range between 53 Hz to 50 kHz. Only minor changes are needed to cover this large frequency range: amplifiers to increase the sensitivities of the current detections for low frequencies and signal generators with higher resolutions at high frequencies to reach 50 kHz. Furthermore, the bridge can be operated for quadrature R:(1/ωC) measurements. The combined standard uncertainties (k = 1) for the new bridge were evaluated for all operating frequencies. They reach 2 nF/F and 4 nΩ/Ω at 1233.15 Hz. At this frequency, the 10 nF:10 nF ratio matched the ratio of PTB's bridge employing inductive voltage dividers within 1 nF/F ± 3 nF/F (k = 1). Over 45 days, the 10 nF:10 nF ratio deviated less than -2 nF/F ± 3 nF/F (k = 1). The 12.9 kΩ:10 kΩ ratio at 53 Hz differed -2 nΩ/Ω ± 5 nΩ/Ω (k = 1) from the DC ratio measured by the PTB's cryogenic current comparator bridge. Using a 12.9 kΩ resistance standard and a graphene AC quantum Hall resistance, the 10 nF:10 nF ratios derived from quadrature measurements agreed with the PTB's inductive voltage divider bridge better than 9 nF/F ± 13 nF/F (k = 1).
期刊介绍:
Published 6 times per year, Metrologia covers the fundamentals of measurements, particularly those dealing with the seven base units of the International System of Units (metre, kilogram, second, ampere, kelvin, candela, mole) or proposals to replace them.
The journal also publishes papers that contribute to the solution of difficult measurement problems and improve the accuracy of derived units and constants that are of fundamental importance to physics.
In addition to regular papers, the journal publishes review articles, issues devoted to single topics of timely interest and occasional conference proceedings. Letters to the Editor and Short Communications (generally three pages or less) are also considered.