直升机旋翼转速调节系统的作用是保证飞机飞行时使旋翼的转速保持恒定，该调节系统包括旋翼转速调节放大器(以下简称“旋放”)、执行机构和转速报警等几个部分。以前使用的各测试系统只是对旋放或执行机构进行单一产品电参数测量的分立式仪器。本课题测试系统以旋放与执行机构组成的整体为研究对象，以数字量代替了以前各分立式测试中的模拟量，实现了旋放性能和执行机构位移关系在一个界面下的测试，为旋放改型设计建立数学模型提供了基础。相比于以前各分立式测试仪器具有很大的方便性。 课题在分析实测系统的基础上，依靠单片机、虚拟仪器和计算机等技术和模块化设计思想完成了整个系统的设计和电路系统测试实验。其中，硬件主要包括数字高精度低频信号源、模拟信号调理板卡、数据采集板卡和通信模块等，实现了旋放工作环境的模拟和测试；软件以LabWindows/CVI6.0为开发平台，创建软面板，借助计算机的强大功能，完成了旋放改型设计所需各项性能指标的测试，为旋放改型设计的进一步进行奠定了基础。 高精度数字低频信号源模块基于直接数字频率合成技术(DDS)，采用了CPU+DDS软件算法的思想，成功模拟了旋翼的转速信号；数据采集模块实现了28路宽量程模拟量输入信号的变送和采集；设计的USB通信模块，利用MCU+USB专用芯片，电路设计简单，成本低，使用方便，为本实验室以后课题研究中通信模块的设计提供了一种新思路。 该系统具有良好的扩展性，便于以后系统的推广使用。

The Rotorcraft rev-regulator system is to keep the Rotorcraft at a constant speed, it includes Rotorcraft-rev-regulator Amplifier、 Executive Device and rev-alarm. Many systems have been proposed to detect the parameters in this system. In the new system in this paper we use the digital quantity instead of the analog variable in former systems and integrate the testing function to Rotorcraft-rev-regulator Amplifier and Executive Device together. It is more convenient and exact for a testing system. Based on the analysis of the factual system，this project completed the testing system design and experimentalize under the support of technologies of MCU、Visual Instrument and Computer as well as the idea of Modularization. We designed modular circuits: the digital low-frequency and high-precision signal synthesizer、analog signals modulation card、data acquisition unit and communication module as well as some other units. we also developed testing software under the LabWindows/CVI6.0 to complete the entire performance test . It lay a strong foundation to redesign the Rotorcraft-rev-regulator Amplifier. The digital low-frequency signal synthesizer is designed based on the DDS and adopts the idea of MCU+DDS, it simulates the speed signal of Rotorcraft successfully; The transformation and acquisition to Twenty-eight analog variable has been realized by the data acquisition unit; The USB communication module has been designed to use MCU+USB dedicated integrated circuit. The designing of electric circuits are easier、lower cost as well as more convenient, it proposed a new way to design the communication module in the laboratory. The system we proposed in this paper can be expanded easily and can be used in future testing system easily.