关键词: 功放, 虚拟仪器, 量程自动切换, 霍尔电流传感器

Abstract: This paper presents an intelligent test system for power amplifiers by using virtual instrument technology. The automatic range switching circuit and Hall current sensor are applied in this system, realizing effectively the measurement of wide-voltage signal and large current signal..LabVIEW, a graphical programming language, and expert system technology are employed to t realize analysis processing ,displaying,printing function of collected signal and to accomplish automation diagnoses of power amplifier. The results of test show: Virtual instrument makes the best use of computer’s operation, storing and displaying function, thus reduce the cost of the instruments while greatly improve the instruments’ flexibility and data processing capacity .With virtual instrument, a measure system can be easily builded for different requirements and they can meet the needs very well.

Key words: power amplifier, virtual instrument, automatic range switching, Hall current sensor