Koncepcja wielokanałowego systemu rejestracji danych

Artykuł jest propozycją rozwiązania problemu budowy wielokanałowego szybkiego systemu akwizycji danych. System zaprojektowano, jako jednostkę monitującą, rejestrującą dane przez wiele godzin. Nowatorskie w tym podejściu jest zastosowanie 3 połączonych ze sobą systemów, FPGA, systemu czas rzeczywistego RT oraz komputer klasy PC. Połączenie to zapewniło dużą częstotliwość próbkowania, przy długim czas monitorowania danych. Zbudowano system, który umożliwia 8 kanałowy 16 bitowy pomiar z częstotliwością próbkowania 200Ksps.

The paper presents a device which is a solution to the problem of fast, long term, simultaneous measurements of energetic values. The system is designed for monitoring 3-phase voltage and current values of the tested load. It consists of tree autonomic devices: FPGA, a real - time platform and a PC computer. This rare combination enables recording fast-distortion signals caused by switching or failure of a part of the power network. This is possible by using high speed acquisition in FPGA. The measured signals are stored on a hard disk with support of a real time operating system. To simplify the user control, all system commands, indicators and preview of the measured signal are sent by a TCP-IP protocol to the PC computer used to control all processes. The introduction is presented in Section 1. The requirements and limitations of the project are specified in Section 2. The hardware used in the project is described in Section 3 divided in Subsection 3.1 which describes the industrial platform PXI and Subsection 3.2 presenting the FPGA data acquisition card. The IDE which was used to develop the system is described in Section 4. Section 5 deals with the work of the system and connection between the devices. Subsection 5.1 is focused on the operating system on PXI, Subsection 5.2 presents the idea of two operating systems, Subsection 5.3 describes the application on the acquisition FPGA - card, Subsection 5.4 presents the idea of a multi thread application of PXI and Subsection 5.5 describes the control-application on PC. In Section 6 there is presented an example of the measured signals. Section 7 contains the conclusions.