1.National Key Laboratory of Science and Technology on Metrology & Calibration, Changcheng Institute of Metrology and Measurement,Beijing 100095,China
2.National Institute of Metrology, Beijing 100029,China
Abstract：For the modulation measuring instrument, a calibration method is proposed, which includes directly using a digital oscilloscope for signal acquisition and measurement in the case of low-frequency carrier, and performing software demodulation analysis to obtain the modulation domain parameters. For the high-frequency carrier case, it is first converted to a low-frequency carrier case using down-conversion frequency technology, and then measured and analyzed. All the courses are discussed in details. In this way, the measurement value of the modulation domain instrument can be traced to the sampling rate and amplitude of the digital oscilloscopes, so as to achieve the purpose of calibrating the modulation meters. Calibration verification experiments performed on a specific type of instrument validate the effectiveness and feasibility of the method described herein.
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2021, Vol. 42 
