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A new approach to the creation of the equivalent voltage dividers is proposed. This approach is based on the creation of the signal, having digitally controlled magnitude by the summing of the signals, having digitally controlled phase. On this basis one possible bridge structure has been developed and its properties analyzed.

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The accurate (uncertainty -better than 1 ppm, sensitivity -better than 0.1 ppm on main ranges) bridge-comparator, balanced by phase control only, is described. Bridge is aimed to measure any impedance in wide dynamic range (from 10 -7 to 10 17 Ohm). It operates in wide frequency range (from 10 -2 to 10 kHz). Bridge balancing and uncertainty correction use the variational method and measurements of unbalance signals.Bridge compares the impedances with arbitrary phase angle, i.

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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