低周波用スペクトラムアナライザの試作

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In order to analyze the higher harmonic waves generated from the thyristor converters or inverters, which are connected to the commercial frequency power line, a low-frequency spectrum analyzer has been constructed for trial. For the purpose of this analysis, the spectrum analyzer will be sufficient practically, if it is possible to analyze from fundamental wave up to 40th harmonic wave concerning harmonic order, and to measure up to one percentage of an amplitude of the fundamental voltage wave concerning amplitude of higher harmonic wave. The spectrum analyzer for trial is one of the heterodyne system and several remarkable features as follows : it is laid emphasis on practicability and simplicity of operation by omitting quite the additional high-grade functions provided in the marketed spectrum analyzer, and moreover, all filters used in the circuits are the active filters composed with the CR elements and the ordinary operational amplifiers, therefore, since the elements, which are hard to obtain at the general market, are not used entirely, it is possible to construct very inexpensively compared with the marketed spectrum analyzer. For one thing, this trial is a challenge whether the resolving power is obtained stably to what extent by using the CR active filters. As an example, the test results for the typical square voltage wave were agree well with the calculation results with accuracy within ±1% error to the reference amplitude of the fundamental wave. And thus the initial purpose was almost accomplished. In this paper, the circuit construction and characteristics of the spectrum analyzer for trial are described.
山梨大学の論文

低周波用スペクトラムアナライザの試作

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