Abstract
The application of high-speed real-time data acquisition is becoming increasingly wide spread in industrial field, and its measurement accuracy is also increasing. The closed-loop test system of sine wave signal is constructed by the RIGOL’s DG1022 dual-channel signal source, DS1102C oscilloscope and PCI7489 multifunctional data acquisition card. Three kinds of timing methods, such as Visual Basics (VB) Timer control, multimedia timer function timing and query performance frequency function timing method, were carried out a series of comparative experiments. This paper analyzes the correlation characteristics of the measured voltage peak data, which includes mean value, variance, standard deviation, range, mutation system, deviation, kurtosis and so on, and then finds out the influence rules of software timing error on data acquisition and measurement accuracy. In the high-speed data acquisition, the repeatability error can be reduced from 84.22% to 0.62%, which provides scientific basis and reference for selecting software timing method in different test environment.
Highlights
With the rapid development of various measuring instruments and equipment, the demand for accuracy and real-time of data acquisition system measurement is increasing.[1,2,3,4] Usually in the time of data acquisition, it is generally believed that the set of collection time interval is accurate, often ignoring the existence of timing errors, and very few people do this research
When data collection time is very short, such as 50 ms, and sine wave signal frequency is 50 Hz, theoretically occur up to three peaks, but the Visual Basics (VB) Timer control timing already has been difficult to control the data acquisition card to capture the peak-to-peak value of sine wave accurately, the results of measurements standard deviation is 0.3312, and the measurement error up to 84.22%
A sine signal with 1-V peak value was generated by RIGOL DG1022 dual-channel function/arbitrary waveform generator, the frequency were set to 50 Hz, 500 Hz, 5 kHz, 50 kHz and 100 kHz, sampling time was set to 1 s, the data measurement accuracy comparative tests were done and each group still repeated six times
Summary
With the rapid development of various measuring instruments and equipment, the demand for accuracy and real-time of data acquisition system measurement is increasing.[1,2,3,4] Usually in the time of data acquisition, it is generally believed that the set of collection time interval is accurate, often ignoring the existence of timing errors, and very few people do this research. Through the comparison of peak data acquisition voltage at different timing time, when the peak-to-peak value of the measurement signal was 1 V, and the operating frequency was 50 Hz, the VB Timer control timing method was very unstable in the acquisition process, and fluctuations and errors were very large.
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