All its properties make it best suitable for the system diagnosis which involves examining 13 analog signals , detecting several digital signal s , issuing the required instructions at an exact pace and sampling many analog signals simultaneously 在硬件设计中选用了pc / 104模块及多功能数据采集模块。实现了加速度计频差信号的动态频率测量、多通道模拟信号的高速同步采样。
A high speed and high precision distributed data acquisition and processing system is designed based on dsp . the synchronous data sampling of supervising system is realized by multi - channel collection retaining and a / d transformation circuit 硬件设计方面，根据电力系统中数据采集和处理的实际特点，设计了信号的多通道采样保持和时分转换电路，实现了多路信号的同步采样和快速转换。
The instrument can sample by dual channel simultaneously , and it can process float point data in high speed and high capacity . you can operate the instrument conveniently . data acquisition , storage , display , and analysis can be achieved on the spot 该仪器可进行双通道同步采样，具有高速浮点数处理能力，容量大，操作简单，功能强大，可完成对振动信号的采集、存储、显示和分析。
The data - sampling section completes analogue - to - digital conversion using fpga and high speed adc , then transmits these data to processing communication equipment in some format . because fpga has high speed processing capacity , this section can obtain very high sampling rate 数据采集部分采用现场可编程门阵列（ fpga ）作为与模数转换器件（ adc ）的接口，在单芯片内实现了同步采样控制、数据编码传输的功能。
This thesis studies a measuring system of three phrase electricity parameter based digital sampling method . its function includes the measuring of current , voltage , fre - quency , phrase , factor , active power and energy , reactive power and energy 本文主要研究基于数字采样测量方法中的同步采样法设计的三相电参数测量系统，主要功能包括电流、电压、频率、相位、功率因数、有功功率、电能、无功功率、电能等的测量。
At the same time , using two - terminal voltages and currents sampled by the medium - speed sampling and processing unit synchronized by the pulse per second ( 1pps ) of gps , the fault locator can realize accurate double - ended steady - state location 同时，线路两端的测距装置利用gps的同步秒脉冲信号（ 1pps ）控制各自的中速采样处理单元对线路的电压、电流信号进行同步采样，用这些同步采集到的数据还可以实现精确的双端稳态法测距。
The paper discusses the advent and development of digital sampling theory , inc - luding the synchronous sampling method ， asynchronous sampling method and quasi - synchronous sampling method . of all the methods , hardware synthronous sampling method cost less and its software is small 本文简述了数字采样原理的产生和发展，对数字采样法中的三种主要方法即同步采样法、非同步采样法、准同步采样法做了基本介绍，并分别对其特点进行了比较。
The meter adopts digital synchronous sampling and micro technology to accurately measure true rms of transformer ' s primary voltage , current , power , power factor , true rms ( ac ) or average ( dc ) of secondary voltage and current , true rms of secondary voltage ripple 该系列仪器采用数字同步采样及微机技术，能准确测量变压器的初级电压、电流、功率、功率因数的真有效值，次级电压、电流的真有效值（交流）或平均值（直流） ，次级电压纹波的真有效值。
The quantizing error , linear error and differential linear error of an a / d converter were deduced , after that the error model of synchronous sampling , asynchronous sampling and quasi - synchronous sampling algorithms used in power measurement were build in condition that a / d was not perfect 推导了a / d量化误差、非线性及微分非线性误差的数学模型。然后，建立了采样功率测量同步采样算法、非同步采样算法和准同步采样算法在非理想情况下的计算机仿真模型。
The main tasks of this thesis are as follows : ( 1 ) a two - terminal fault location arithmetic based on the synchronization sampling of gps has been brought up . ( 2 ) because of the cost of gps and the truth that there is phase difference of two - terminal , the two - terminal fault location arithmetic is faced up with facts that how to keep the sampling data of two - terminal synchronous . according to that , two new methods are proposed , which do n ' t need the synchronized sampling data of two - terminal 全文主要工作如下： ( 1 )利用全球定位系统gps的授时功能，提出了基于gps同步采样的双端故障测距算法； ( 2 )由于增加gps硬件设施，造价比较高，且客观上双端数据存在着不同步相差，双端故障测距法所面临的主要问题是两端数据采样的同步问题，针对这一问题，本文又提出了两种不需要两端数据采样同步的工频故障测距新方法，基于powell方向加速法和基于遗传算法的故障定位算法。
