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A binary Josephson system was used to characterize an 81/2-digit sampling voltmeter. This voltmeter is the heart of the primary standard for power at 50 Hz or 60 Hz at several National Metrology Institutes (NMIs). In this paper, we present first results on the calibration of the voltmeter under conditions that mimic its use in the power standard set-up. Furthermore, the dependence of the root-mean-square...
This paper describes how to calibrate a Self-Calibration Decade Inductive Voltage Divider (S-IVD). The S-IVD consists of windings of a decade main-divider and nine bifilar windings as an essential standard. A commercial Four-Terminal-Pair (4TP) LCR meter is used for measuring the differential vector voltage of the S-IVD. It does not require injection signals for balancing. The S-IVD can be calibrated...
This paper deals with the characterization of the metrological performance of digitizers so that they can be used for metrology applications. Apart from dc behaviour such as linearity, stability, and noise, especially the dynamic performance of the digitizers is important and thus the measurement of AC flatness, phase, and sample jitter are essential. We present here first results of characterizations...
Sampling is a promising technique for comparing the stepwise-approximated sine waves synthesized by an AC Programmable Josephson Voltage Standard to the sinusoidal voltages of a secondary source at low frequencies (a few hundred hertz or less). This paper describes a differential method that uses an integrating sampling voltmeter to precisely determine the amplitude and phase of high purity sine wave...
The paper describes a test procedure, the test waveforms, and the reference equipment used to calibrate the voltage and current total harmonic distortion (THD) measuring functions of multi-function electrical standards. It also shows that it is possible to establish traceability to the SI units for the THD measurements by measuring the voltage and power of the test waveforms with voltmeters and wattmeters...
The AC quantum voltmeter, an instrument for measuring AC waveforms by comparing them to a Josephson waveform, has been enhanced. Two different improvements to the signal-to-noise ratio are presented. The signal amplitude has been significantly increased by using 10-V Josephson arrays. The noise contribution has been reduced by adding a preamplifier at the input of the sampling null detector.
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