Kochan R. Methods and equipment of metrology self-testing of precision analogue to digital converters during exploitation

There is solved an scientific and technical problem of uniformity the measurements and providing metrological reliability of the conversion results of analog to digital converters (ADCs) with limited complexity of their metrological support. It is proposed to embed the metrology self-testing system into ADC. This metrological self-testing system is based on null setting, calibration and nonlinearity identification (these procedures are necessary and sufficient). The nonlinearity identification procedure is based on multi-resistors voltage divider connected to ADC calibration source. It is proved that this voltage divider, in the case of averaging voltages on all resistors, is a converter with negligible small error. It provides development basic method of ADC's integral nonlinearity identification and methodology of this method modification. It gives opportunity to develop new seven methods. It is showed that noise of ADC is the main source of residual error and it brings error less than 0,0002 %. There is investigated the compatibility of the proposed methods for nonlinearity identification and correction of precision sigma-delta ADC. There is proposed and investigated the conception of development of metrology self-verification system of ADC. There is proved the utility of ADC implementation in temperature measurement systems using replacement method (error less than 1 mK).