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Abstract. Calibration interval adjustment of measuring instruments is one of the urgent tasks in industries. The article represents the calibration interval calculation of the potentiometer PCB-4P according to the verifications for the 4 year period of the Metrological Department in the aviation plant. The calibration interval is shown to be increased according to the calculation of its reliability and stability of metrological characteristics.

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Abstract. The creeping speed mode is studied with calculation of the resultant vector of the flux linkage ψ 0 of the double-fed machine. It is shown that use of the double-fed machine as the actuating motor in the creeping speed mode increases the working off accuracy of the motion law. A mathematical model of the double-fed machine to study various modes of the CNC machine including the creeping speed mode is developed. The method to estimate the load parameters of the double-fed machine is presented. Practical implication of the study is confirmed by the results obtained in the evaluation of the influence of load parameters on the dynamic indicators of actuating electromotor.

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