The operational principle of the measurement instrument is introduced , the circuit and characteristic of the integrated single channel pulse height analyzer and those of high performance adc are analyzed , and the measured real - time curves of liquid level and foam height are discussed 介紹了該測量儀的工作原理,分析了高速集成單道幅度分析器和高性能a / d轉(zhuǎn)換器的電路及特點,討論了液位曲線和泡沫高度曲線。