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文中探讨ＪＪＧ６３９－９０规程中有关超声功率参数的检定，提出当检测Ｂ超机功率时，应考虑有效作用平均功率和峰值功率，并对当用磁电式力平衡机构声功率计来检测Ｂ超机声功率存在的不足提出了看法。
The paper discusses the verification of the ultrasonic power parameters in the JJG639-90 procedure, and proposes that the effective power and peak power should be considered when detecting the power of a B-mode ultrasound machine, and the B-mode ultrasound power meter should be used to detect the B-mode ultrasound. The lack of sound power in the machine provided insights.