Balanced wide frequency range quadrature phase shifter

Surdu, M. N.; Lameko, A. L.; Surdu, D. M.; Kursin, Sergii

doi:10.1109/cpem.2010.5543424

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Autotransformer Bridge: Description and Analysis1

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“…The bridge consists of the supply unit (the generator G connected to the voltage transformer TV), the main autotransformer AT and the variationally balanced 90 phase shifter [28], which is calibrated through calibration circuit CC. The vector voltmeter VV (through the preamplifier PA and switchers S 1 and S 2 ) measures the bridge (U 1 ,U 2 ) and the calibration circuit CC (U c ) Figure 8.…”

Section: Autotransformer Bridge: Description and Analysismentioning

confidence: 99%

Variational Calibration

Surdu¹

2018

Metrology

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The approach to the improving the accuracy of the impedance parameter measurements is described. This approach is based on the well-known variations of the influence of the disturbing factors on the results of measurement. Using these variations, measurement circuit provides the additional number of measurements, equal to the number of the disturbing factors. System of equations describes these results of measurements. The solution of this system eliminates the influence of the appropriate uncertainty sources on the results of measurement and gets the true result of the measured value. In addition, the solution of this system also gets the values of the uncertainty components in every measurement and possibility to monitor the properties of the measurement circuit. Examples of the realization of this method for improving the accuracy of the impedance parameter measurements in different bridges are given.

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Section: Autotransformer Bridge: Description and Analysismentioning

confidence: 99%