A.M. Abramov1

1 FSBEI HE “Ryazan State Radio Engineering University named after V.F. Utkin” (Ryazan, Russia)

1 abramov.a.job@yandex.ru

In order to control metrological and technical characteristics of the apparatus and software of the “Multimag-M” complex, which contains diagnostic instruments for measuring pulse wave, breathing process, blood pressure and blood oxygen saturation (saturation), it was proposed to introduce an automated block of control, testing and self-calibration into the structure of the chrono-magnetotherapy complex [1]. The main purpose of the unit is the formation of test signals (TS) with precision, adjustable parameters and the organization of verification methods. As one of the verification techniques, a new method, called the method of related histograms, which does not depend on the linearity of TSs, was proposed [2, 3]. The new method is based on the sequential feeding of a periodic triangular-shaped TS, a level-shifted down TS and a level-shifted up TS to the input of a diagnostic channel, which generally contains an input analog device and an analog-to-digital converter (ADC), to obtain three histograms and calculate the ADC code transition time for each histogram, which allows to determine the contribution of the nonlinear component of the TS to the integral nonlinearity (INL) for each ADC code, except for the minimum and maximum, and taking into account the nonlinear component of the IC to determine the INL function of the ADC. When introducing a new verification method, it is important to evaluate its effectiveness [4].

The aim of the work is to evaluate the efficiency of the method of connected histograms using simulation modeling in LabVIEW graphic programming environment, by comparing the calculated with the given (true) INL function of the diagnostic channel of the “Multimag-M” complex.

Modeling has shown that the method of related histograms can accurately estimate the INL function of the diagnostic channel of the “Multimag-M” complex with an error of less than 1 LSB (least significant bit). The model of the diagnostic channel containing an input analog device and a 12-bit parallel ADC was used as an object of research. To check the adequacy of the developed model of the metrological test system, modeling was carried out on the object of study at different combinations of the average number of ADC code appearances per quantization interval and additive noise amplitude.

Application of the new method of control of metrological characteristics of diagnostic channels of the “Multimag-M” complex will allow to reduce the requirements to the reference measuring instruments in terms of accuracy class by taking into account the nonlinear component of the TS.

Abramov A.M. Analysis of the effectiveness of the method of related histograms in testing diagnostic channels in complex magnetotherapy. Biomedicine Radioengineering. 2025. V. 28. № 4. Р. 43-56. DOI: https://doi.org/10.18127/j15604136-202504-05 (In Russian).

1. Abramov A.M., Gurzhin S.G., Proshin E.M. Kontrol' metrologicheskih i tekhnicheskih harakteristik apparatno-programmnyh sredstv kompleksa hronomagnitoterapii «Mul'timag-M». Biomedicinskaya radioelektronika. 2008. № 7. S. 29–34. (in Russian).
2. Abramov A.M. Sposob opredeleniya integral'noj i differencial'noj nelinejno-stej ACP po trem gistogrammam pri ispytaniyah diagnosticheskih kanalov v kom-pleksnoj magnitoterapii. Biomedicinskaya radioelektronika. 2024. T. 27. № 4. S. 25–35. (in Russian).
3. Abramov A.M. Uchet nelinejnoj sostavlyayushchej izmeritel'nogo signala po svyazannym gistogrammam pri metrologicheskih ispytaniyah ACP. Vestnik Ryazanskogo gosudar-stvennogo radiotekhnicheskogo universiteta. 2024. № 88. S. 95–105. (in Russian).
4. Vostroknutov N.N. Cifrovye izmeritel'nye ustrojstva. Teoriya pogreshnostej, is-pytaniya, poverka. M.: Energoatomizdat. 1990. 208 s. (in Russian).
5. IEEE Std. 1057-1994. IEEE Standard for Digitizing Waveform Recorders. Institute of Electrical and Electronics Engineers. Inc., New York. USA. 1994.
6. IEEE Std. 1241-2000. IEEE Standard for Terminology and Test Methods for Analog-to-Digital Converters. Institute of Electrical and Electronics Engineers. Inc., New York. USA. 2000.
7. CEI IEC62008- First edition 2005-07, "Performance characteristics and calibration methods for digital data acquisition systems and relevant software". P. 28–29.
8. IEC60748-4-3- First edition 2006-08, "Semiconductor devices Integrated circuits- Part 4-3: Interface integrated circuits- Dynamic criteria for analogue-digital converters (ADC)". P. 9–10.
9. EEE Std. 1057-2007, IEEE Standard for Digitizing Waveform Recorders, Institute of Electrical and Electronics Engineers. Inc., New York. USA. 2008.
10. Patent № 2828783 (RF), MPK H03M 1/10. Sposob opredeleniya integral'noj i dif-ferencial'noj nelinejnostej ACP i ustrojstvo dlya ego osushchestvleniya. A.M. Abramov; RGRTU. Zayavl. 07.02.2024; Opubl. 18.10.2024, Byul. № 29. 22 s. (in Russian).
11. Abramov A.M. Analiz effektivnosti metoda metrologicheskogo ispytaniya pri vychislenii integral'noj nelinejnosti ACP. Vestnik Ryazanskogo gosudarstvennogo radiotekhnicheskogo universiteta. 2024. № 90. S. 133–142. (in Russian).
12. Abramov A.M. Vliyanie nestacionarnyh effektov ispytatel'noj sredy na tochnost' metoda svyazannyh gistogramm pri metrologicheskom ispytanii ACP. Vestnik Ryazanskogo gosudarstvennogo radiotekhnicheskogo universiteta. 2025. № 91. S. 249–255. (in Russian).