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Generally, a special device is required for high-frequency voltage measurement. This paper is to introduce a simple new device for the measurement which can be applied to exactly measure the comparatively low high-frequency voltage and any high-frequency voltage of any wave shape even when there is not a special device.
This essay introduces the experimenting principles and methods of testing electric resistivity with methop of whirling currents by measuring silicon samples. Compared the results with that of of the classical testing with tetrapolar poles it shows this experiment method is more complicated but the results are reliable. It can measure the electric resistivity of the semiconductor materials within ta...
The paper introduces the excitation system parameter test of No. 1 unit in Gansu Hanpingzui Hydropower Station. According to the field test data, the excitation system model for stability calculation is set up and the model parameters are obtained. No-load 5% step response of No. 1 unit is simulated by BPA simulation software. The simulation result indicates that the mathematical model and its parameters...
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