Thermal voltage converter calibrations using a quantum ac standard

Abstract

We report on the first-ever use of a quantum ac source to calibrate a thermal transfer standard as part of the NIST calibration service for such devices, with reductions in calibration uncertainty of as much as an order of magnitude over traditional ac-dc transfer methods. We briefly describe the basic quantum ac calibration system, its operation and measurement results. An analysis of the uncertainties for the measurements is presented and plans for further development are described.

Correction of Systematic Errors Due to the Voltage Leads in an AC Josephson Voltage Standard

“…At 2.5 kHz, the standard uncertainty of the ac-dc transfer calibrations using the ACJVS was derived in [2]. For higher frequencies the influence of the following error sources was additionally taken into account: test repeatability, residual systematic errors due to the intrinsic array inductance, [6], and lead voltage correction.…”

“…uring the last twelve years, the quantum-based pulsedriven ac Josephson Voltage Standard (ACJVS) has progressed from a concept to a calibration instrument, [1], [2]. The operating principle of such a standard was described in detail in a series of papers [1] - [6].…”

“…In the following we present preliminary investigations of systematic errors due to signals on the voltage leads between the array and the DUT. These frequency-dependent errors can be neglected at 10 kHz and below [2], but must be taken into consideration at higher frequencies.…”

Development of Josephson voltage standards

“…Then, pulse-driven arrays were utilized for calibrations of thermal converters and transfer standards, which are well-established devices in ac metrology (cf. Lipe et al, 2008;Benz et al, 2009a). Single-or multi-tone signals were, in addition, used for the characterization of electronic components like filters or a/d converters (cf.…”

Establishing an AC JOsephson Voltage Standard at NRC

“…The NIST pulse-driven AC Josephson Voltage Standard (ACJVS) has been described in the literature [1]; see a detailed reference list in the review paper [2]. At NIST it progressed from an experimental phase to a practical application phase [3]. Several other NMIs have also intensified efforts leading to an adoption of ACJVS as a primary ac voltage standard [2].…”