An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.
模拟信号由直流和交流分量、频率和相位四部分组成。
As the frequency of the AC component increases, the DC meter response decreases, until at some frequency only the average input voltage will be displayed.
当交流分量的频率增加时，直流仪表的响应就会变得不够快，直到在某一频率时，仪表只能显示出输入电压的平均值。
A method for direct measuring the frequency of a free electron laser using AC Josephson effect is presented.
提出一种利用交流约瑟夫森效应直接测量自由电子激光频率的方法。
An AC powered source usually has a significant level (often several volts) of line frequency common mode voltage.
交流供电的源通常具有很高电平的电源频率共模电压(常常有几伏)。
Individual infinite variable speed drive of each roll with AC-motors coupled to programmable frequency inverters.
电机驱动方式为交流变频无极变速驱动。
Based on the theory of ac fluid networks, the frequency response characteristics of a hydraulic fluid system were analyzed.
根据交流流体网络理论，通过单传管路的传递函数阵分析了液压流体系统的频率响应特性。
On usual DMM only can measure signal's amplitude of DC and AC from fifty to five hundred Hz, it can not measure signal's frequency or amplitude of high frequency.
数字万用表（DMM）只能测量直流和几十到几百赫兹的低频正弦信号幅度，不能测量高频信号和信号的频率。
It has proven by practice that the two solutions both can implement Variable Frequency Control of ac Motor well, and have good applied cost.
实践证明，两种解决方案均能很好地实现交流电机的变频控制，具有良好的应用价值。
We design a suit of aviation AC excitation generator system, it insures the output voltage is constant frequency and constant voltage.
我们设计了一套航空用交流励磁发电机系统，以保证输出电压恒频恒压。
The zero-crossings of the AC voltage and digital frequency synthesizer are used in solving the two main problems in frequency hopping system-synchronization and fast frequency synthesizing.
利用电力系统三相交流电压过零点和高速数字频率合成器解决了跳频系统中同步和快速频率合成的两个关键问题。
Against the heavy equipment load and complex operations characteristic, the spindle used vector control technology of ac frequency speed control; the car used advanced ac servo control technology.
针对该设备负载大、运行情况复杂等特点，主轴采用了交流变频调速矢量控制技术，小车采用了先进的交流伺服控制技术。
A synchronized towing system with constant tension composed of AC Frequency conversion speed regulator is introduced.
本文介绍一种由交流变频调速器构成的恒张力同步拖动系统，应用于圆筒针织物冷轧堆设备上。
Based on the introduction of components and principle of work of frequency modulation system of constant frequency AC power supply, math model of frequency modulation system is established.
在介绍某型恒频交流电源频率调节系统的组成和工作原理的基础上，建立频率调节系统的数学模型。
This paper introduces the features of the frequency control technique of AC motor, and expounds the present situation, developing trends and applicability of the converter technique.
介绍了交流电动机变频调速技术的特点，阐述了变频技术的现状和发展趋向及其应用领域。
On the basis of digital signal process and nondestructive testing, the effect of welding process on the frequency spectrum of the current signal in AC spot welding is analyzed.
在数字信号处理及无损检测的理论基础上，分析了焊接过程对电流信号频谱的影响。
The theory of AC frequency modulation for motor speed regulation technology, its applied procedure and actual effect in dedusting fan of converter are stated.
介绍了交流变频调速技术的原理、在转炉除尘风机上的实施过程和使用效果。
A set of ac power-supply circuits carrying currents of equal frequency with uniformly-spaced phase differences.
一组频率相同，相位彼此相差均匀的交流供电电路。
Direct Torque Control (DTC) of induction motor based on DSP is new technology of high performance AC — frequency conversion — rate of regulation.
基于DSP的电动汽车用交流电机的直接转矩控制是电机高性能交流变频调速的新技术之一。
The steady principle of the inverter with a high frequency pulse AC link and the unipolarity phase shifting control strategy are investigated.
该文深入分析研究了高频脉冲交流环节逆变器稳态原理特性与单极性移相控制策略。
A novel topologic structure of high frequency AC pulse density modulation converter is proposed, and its operation principle, control scheme and design are described in detail.
提出了一种新颖的高频交流脉冲密度调制变频器的拓扑结构，并详细阐述了工作原理、控制方案和设计方法。
To introduce the application of fully digital AC frequency converter in the stainless steel cut to length line, describe its configuration, functions and control features.
介绍全数字交流变频调速装置在不锈钢横切生产线上的应用，说明其基本配置、功能和控制特点。
Purpose: Used in circuit of DC or low frequency AC.
用途：用于直流或低频交流电路中。
This paper proposes a novel structure of high frequency AC hybrid resonant inverter power for electric vehicles, and describes design and analysis principle of the hybrid resonant network.
提出了一种用于电动汽车的高频交流混联谐振逆变电源的结构，描述了混联谐振网络的设计原则和分析方法。
At present, the major application trend of servo system is AC frequency conversion servo system.
变频交流伺服系统是目前伺服系统应用的主要趋势。
A circuit topology family of inverters with high frequency pulse AC link and a double polarities phase-shifting control strategy are proposed and deeply investigated.
提出并深入研究了高频脉冲交流环节逆变器电路拓扑族及其双极性移相控制策略。
DSP-based variable frequency AC motor speed control system, he is more use of the procedure.
基于DSP的交流电动机变频调速控制系统，他是比较使用的程序。
This paper introduces application and developing tendency of AC speed control technique by changing frequency in crane's electrical diving of port and Marine based on potential energy load.
文章主要介绍具有位能性负载特点的港口及船舶起重机械电气传动中交流变频调速技术的应用及发展趋势。
The main parts of the aircraft VSCF electrical power system consist of the no-brush AC variable frequency generator, converter and controller.
飞机变速恒频电源系统的主要部件有无刷交流变频发电机、变换器和控制器。
The main parts of the aircraft VSCF electrical power system consist of the no-brush AC variable frequency generator, converter and controller.
飞机变速恒频电源系统的主要部件有无刷交流变频发电机、变换器和控制器。
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