The new state measurement standard of the unit of frequency deviation of frequency-modulated oscillations

Abstract

The article is devoted to the review of the main results of research and development works performed during the improvement of the state primary measurement standard of the frequency deviation unit. The article analyzes the situation in the field of measuring the parameters of frequency-modulated oscillations in Ukraine that led to the need for improving the unit of frequency deviation created in 1996, namely the need to significantly enhance metrological characteristics and expand the functionality of the measurement standard.Тhe principle of building a modern measurement standard with advanced functionality, improved metrological characteristics was developed. Solutions used the modern hardware level for measuring parameters of oscillations with frequency modulation and expanding modulating frequencies and deviations.In the measurement standard, the role of the reference receiver is performed by the spectrum analyzer, which implements the method of measuring the deviation of the Bessel function “zeros” (NFB). The second method used in the measurement standard is a digital method known as the “electronic counting frequency meter” (ELC) method. One of the comprehensive decisions was the use of digital signal generators, which are based on DDS technology (direct digital synthesis) and its subsequent version – Trueform. The article presents the results of analysis of metrological capabilities of these generators in the FM mode, original methods of their research and new results obtained.During the improvement, the method of receiving the FM signal, based on the use of a spectrum analyzer and an option, analog-digital demodulator, was used and investigated. Automation of control and computational operations on the measurement standard on the basis of the Labview program was carried out.As a result, a reference complex was created, which according to its metrological characteristics and functional capabilities is able to calibrate not only the devices in the FM mode, but also a wide range of radio measuring instruments of both receiving and generating types.