preamplification meaning in English
前置放大作用
预放大
Examples
- A range automatic transfer is designed for the preamplification system with resistance feedback
前置放大电路设计了量程自动切换的电阻反馈式两级放大。 - 2 . the sign of temperature is by extracted mini - thermal - electronic - couple transducer , and amplified by preamplification circuit and main magnifier . the processed data are sent to the computer after a / d conversion , which is displayed in curve form through the software controlling panel built by delphi 3
设计制作了无失真、抗干扰的温度信号检测电路，实现了加热过程的实时温度监测，尤其解决了以往由于金属材料在微波场中的热传导及欧姆热效应而引起的干扰问题。 - This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering . at first , this paper gives the brief introduction of the history and present status of accelerometer and its testing technology , the working principium and math model of the liquid floated pendu - lous accelerometer , and then , decides the binary width pulse force retrim loop as the design proposal of testing system , researches the transfer function of every part in the system emphasizly , analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system , and designed the correcting net , analyses the basal problems such as resolution , sampling restraint , precision and so on , designs the hardware testing circuits such as preamplification , band - pass filter , alternating amplifier , phase sensitive demodulatorn , pulse - width modulation , frequency scale circuit , moment current generator . finally , using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system , realized the testing functions
首先对加速度计及其测试技术的发展历史和现状,液浮摆式加速度计的工作原理和数学模型等作了简要的介绍,然后确定了以二元调宽脉冲再平衡测试回路为设计方案,并从控制理论的角度进行了分析,着重研究了系统中各部分的传递函数,利用系统开环传递函数分析了系统的稳定性,同时设计了系统的校正网络;分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题,并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路,验证了电路的正确性,最后按照测试系统的要求,采用了美国ni公司专为测试领域所开发的虚拟仪器工具? ? labview作为测试软件开发工具,利用该图形化编程语言完成了测试系统软件部分的设计,实现了测试功能。