Temat: time interval counter - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A study of the effect of temperature changes on the interpolating time counter
Autorzy:: Sondej, D.
Szplet, R.
Powiązania:: https://bibliotekanauki.pl/articles/114363.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: time interval measurement
time-to-digital conversion
two-stage interpolation
time counter
Opis:: This paper presents an analysis of the impact of ambient temperature changes on main parameters of the interpolating time counter. The performed tests reveal that a relatively small change in the ambient temperature of 1°C causes a measurement error of the counter as large as 3.5 ps. The thorough research of two stages of interpolation of the counter allowed determining the main sources of the error. One of them is the temperature drift of widths of four-phase clock (FPC) segments in the first interpolation stage (FIS). It equals 2.5 ps/°C. The widths of FPC phases directly influence the active range of the second interpolation stage (SIS) and its offset. The test results also show that the temperature drift of the offset has a greater impact on the measurement accuracy than the temperature-driven changes of quantization steps in SIS. The presented conclusions are the first step to develop a new method for reducing the impact of changes in the ambient temperature on the measurement accuracy of the interpolating time counter.
Źródło:: Measurement Automation Monitoring; 2015, 61, 7; 302-304
2450-2855
Pojawia się w:: Measurement Automation Monitoring
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Badanie nieliniowości w precyzyjnym pomiarze przedziału czasu dla wybranych typów częstościomierzy-czasomierzy
Verification of nonlinearities in time interval measurement with a chosen type of time inteval counters
Autorzy:: Urban, A.
Czubla, A.
Osmyk, R.
Szterk, P.
Krehlik, P.
Śliwczyński, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/952793.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:: pomiar przedziału czasu
częstościomierz-czasomierz
nieliniowość
niepewność pomiaru
time interval measurement
time interval counter
nonlinearity
measurement uncertainty
Opis:: Celem niniejszego artykułu jest zaprezentowanie metody i wyników badań nad nieliniowością częstościomierzyczasomierzy w pomiarach precyzyjnych przedziałów czasu, prowadzonych w GUM przy współpracy z AGH. Dokonano porównań wyników pomiarów dla częstościomierzy-czasomierzy SR620 i HP 53132A zarówno stałych i zmiennych przedziałów czasu. Potwierdzono przydatność dwukanałowego generatora/dzielnika typu Dual Channel 1/100 PPS Generator oraz komparatora częstotliwości typu A7-MX.
In this paper we present the method and the last results of verification of nonlinearities in time interval measurements with the usage of Time Interval Counters (TIC), performed at Central Office of Measures (GUM) with cooperation of AGH University of Science and Technology. We consider the non-ideal operation of TIC manifested by fluctuations of differences between the current indication of TIC and the real value of the measured time interval. We observed instabilities of indications of TIC, even if the measured time interval is keeping constant. For verification of TIC operation at continuously changed time intervals, it was set up a special measurement system that performs simultaneous measurements of the phasetime changes between two standard frequency signals (with the usage of A7-MX standard frequency comparator) and time intervals between two pulse signals (with the usage of TIC under test). Due to applying a special, developed by AGH, dual channel 1/100 pps generator, the measured 1 pps (1 pulse per second) and 10 MHz signals are standardized and the phasetime between 1 pps and 10 MHz signals are kept in pairs constant. Differences between the indications of TIC and the proper measurement results for frequency allow to verify internal nonlinearities of TIC in time interval measurements. Here, we show and shortly discuss the results obtained for SR620 and 53132A universal counters. The obtained range of fluctuations of indications of SR6200 with relation to the measured time interval approaches about 190 ps, and for 53132A – about 450 ps, whereas the observed short-term noise of measurement for SR620 is about 10 ps, and for 53132A – about 100 ps typically. It was confirmed the complex and random influence of many factors on operation of TIC. Our investigation will be continued with the usage of 100 pps (100 pulses per second) signals and with automatic switching of the measured pulse signals in pairs.
Źródło:: Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2014, 38; 81-84
1425-5766
2353-1290
Pojawia się w:: Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Employing FPGA DSP blocks for time-to-digital conversion
Autorzy:: Kwiatkowski, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/221505.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: time-to-digital converter
time coding line
time interval counter
digital signal processing
field-programmable gate array
Opis:: The paper presents a novel implementation of a time-to-digital converter (TDC) in field-programmable gate array (FPGA) devices. The design employs FPGA digital signal processing (DSP) blocks and gives more than two-fold improvement in mean resolution in comparison with the common conversion method (carry chain-based time coding line). Two TDCs are presented and tested depending on DSP configuration. The converters were implemented in a Kintex-7 FPGA device manufactured by Xilinx in 28 nm CMOS process. The tests performed show possibilities to obtain mean resolution of 4.2 ps but measurement precision is limited to at most 15 ps mainly due to high conversion nonlinearities. The presented solution saves FPGA programmable logic blocks and has an advantage of a wider operation range when compared with a carry chain-based time coding line.
Źródło:: Metrology and Measurement Systems; 2019, 26, 4; 631-643
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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