A highly reliable, precise, user-friendly, and easy-to-maintain frequency measurement system has been proposed and developed for use in the field of power electronics. The system is designed to provide accurate and real-time measurements, making it efficient and convenient for both operation and maintenance. The hardware platform is based on an embedded PC104 computer, while the software development is carried out using LabWindows/CVI. The system employs a measurement cycle method, selecting different reference frequencies depending on the frequency being measured. Practical tests have confirmed that the design meets the required standards for accuracy and real-time performance, and it can also be applied in other fields where high-precision frequency measurements are necessary.
In the field of power electronics, frequency is a fundamental physical quantity, and its accurate measurement plays a crucial role in engineering applications. Traditional approaches often rely on microcontrollers or programmable logic devices. However, in certain harsh environments, conventional methods may not meet the required levels of accuracy and reliability, or they may be too costly. To address these challenges, this paper presents a frequency measurement system based on a PC104 measurement and control computer. By selecting appropriate reference frequencies according to the tested signal, the system achieves a measurement accuracy of 0.2% and enables the simultaneous measurement of multiple signals.
The overall design of the system is based on the measurement cycle method. This approach involves using a standard frequency signal as a reference to measure the period of the input signal. The system includes a conditioning module to process the input signals, which are then transmitted through the PC104 bus to the operating system. The data is processed by algorithms and displayed on a liquid crystal screen.
The hardware design utilizes the PC104 platform, which is fully compatible with standard desktop PCs and offers features such as compact size, low power consumption, wide temperature range, and high reliability. It is well-suited for use in challenging environments. Functional modules such as DMM-32X-AT, OMM-XT, and GPIO-MM-XT are used to enable the simultaneous measurement of multiple frequency signals.
The software design leverages NI LabWindows/CVI as the development environment, offering tools for data acquisition, analysis, and display. Multi-threading technology, specifically a thread pool, is employed to improve real-time performance when handling multiple signals. Additionally, the SQLToolkit is used to record test data and perform offline analysis.
Experimental results show that the system achieves a measurement error below 0.2%, confirming its effectiveness in power electronic applications. The system is easy to operate, highly reliable, and efficient, making it suitable for various industrial settings. Overall, the proposed frequency measurement system provides a robust solution for high-precision frequency measurement in demanding environments.
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