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本文阐述和分析了采用 B&K 4143型互易校准仪对一英寸标准电容传声器进行校准所迂到的一些问题。论证了传声器灵敏度和大气压的关系,指出气压降低时,传声器灵敏度升高,并提出了符合实际使用的灵敏度修正公式。本文还论述了传声器灵敏度和极化电压的关系,提出了精确测量极化电压的平衡法。最后,指出应重视标准电容传声器的实验室环境的控制和保存条件。
This article describes and analyzes some of the problems with using the B & K 4143 Reciprocal Calibrator to calibrate one-inch standard condenser microphones. The relationship between the microphone sensitivity and the atmospheric pressure is demonstrated. It is pointed out that the sensitivity of the microphone increases when the air pressure decreases, and the sensitivity correction formula that is suitable for practical use is proposed. This paper also discusses the relationship between the sensitivity of the microphone and the polarization voltage, and proposes a balanced method of accurately measuring the polarization voltage. Finally, it is pointed out that the control and storage conditions of the laboratory environment of standard condenser microphones should be emphasized.