Self-checking square-voltage phase-difference converter

Autor: I. Kh. G. Korsunskii, A. M. Ilyukovich, A. T. Dyuzhin
Rok vydání: 1984
Předmět:
Zdroj: Measurement Techniques. 27:832-836
ISSN: 1573-8906
0543-1972
DOI: 10.1007/bf00863754
Popis: Phase-difference (PD) converters of sine to dc voltage usually provide for two successive operations: shaping of square voltages (SV) from the zero transitions of dle sine wave and PD-SV conversion to dc voltage [i]. Checking of converters that perform these operations allows determination of the metrological characteristics of the PD converter as a whole. The errors of the devices that distinguish the zero transitions can be found by feeding to the inputs in-phase sine waves, which creates the prerequisites for its self-checking (SC). ~lere are no fundamental difficulties here, and the question of such checking is not considered here. A device that performs P~-SV conversion is checked most simply using a two-phase generator (TPG) of SV with variable PD [2]. Since PD is a dimensionless value, SC methods are also applicable in this case, but the error due to interchannel coupling must be eliminated. The couplings can have direct or capacative components [3]. With intermediate accuracy requirements and selection of the proper design, the effect of the direct component can be made negligible. In the frequency range to i00 kHz, for which the converter in question is designed, the effect of capacitative coupling is small and does not vary with time. ~lis approach to phase-meter checking differs from the conventional, in which the phase meter as a whole is checked using phase calibrators [4]. However, its use simplifies checking and in some cases is advisable.
Databáze: OpenAIRE
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