Autonomous metrological security of automatic checking systems for ac voltage and current measuring facilities in the frequency range from 20 Hz to 100 kHz

Increasing Metrological Autonomy of in-Plant Measuring Systems

“…After disconnecting them from the measuring signals a stable reference signal should be simultaneously connected to the inputs of the all MIs. Using the series of readings obtained from this set of MIs of the same kind -{Х 1 , Х 2 ,…, Х m } it is necessary to compute its arithmetic mean, which is considered to be a reference value: (1) Then, having determined errors of the MIs {Δ 1 , Δ 2 ,…,Δ m } and having compared values of these errors with maximum allowable limits for each MI there can be identified MIs whose error exceeds the allowable limits and, therefore, they should be removed from the process of measurements and be calibrated. An important requirement in the implementation of this method of comparison is to ensure the stability of the reference signal source while recording readings of all the MIs under test.…”

“…In particular, the speed and accuracy of decision making on functioning many industrial processes and systems depends on the accuracy, correctness and timeliness of measurements and monitoring of various parameters. Therefore, the level of measurement reliability in various fields of human activity largely determines their effectiveness [1,8,11,15,22].…”

“…Because of significant deterioration [12] of standard equipment and rising prices on metrology services, the role of organizational and technical measures to ensure a certain metrological autonomy of in-plant measuring systems that will reduce the cost of their metrological support while ensuring the required level of unity, accuracy and reliability of measurements significantly increases [1]. That is why the market for metrological services is estimated to be about 4% of GDP in developed countries [6,7].…”