Measurement of the phase difference of the two signals has found wide application in various fields of science and technology. However, the existing methods of measurement do not fully meet modern requirements-high speed and high accuracy of phase shift measurement. In this paper we consider a new method for measuring the phase difference, based on the deterministic increment of the initial phase of one of the signals, which makes it possible to achieve high speed and small measurement error, analytical dependencies of the method are derived. The method is based on digital signal processing. References 10, figures 2, table 1.
Abstract. The quadrature bridge for comparison of the impedance standards in wide frequency and dynamic range was developed. The digital phase inversion of the operating signal is the single internal standard of this bridge. Technically bridge is based on the digital synthesizers of the sinusoidal signals, which are used as sources of quadrature voltages, supplying the standards to be compared. The appropriate algorithm of measurement eliminates the influence of the synthesizer's uncertainty on the results of measurement. The bridge can compare the impedance of the standards on frequency range from units of Hz to units of kHz with uncertainty better than 1 ppm and resolution better than 0.03 ppm.Le pont en quadrature a été élaboré pour comparer les impédances sur une large bande de fréquences et valeurs de l'impédance. Le seul étalon interne du pont est l'inversion numérique de phase du signal. Dans l'aspect technique, l'étalon est se base sur les synthétiseurs numériques des signaux sinusoïdaux, utilisés comme les alimentateurs des branches du pont. L'algorithme élaboré exclut complètement l'erreur des synthétiseurs sur le résultat de la comparaison des impédances des étalons comparés. Le pont peut comparer les étalons variant entre les unités Hz et les unités kilohertz avec l'erreur de moins de 1 ppm et sensibilité de plus de 0.03 ppm.
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