助手标题
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
共[17]条 当前为第1条到17条
 

相关语句
测量
    The impedance measurement is completed by vector voltage method,including the technologies of testing impedance using auto-balance bridge,10 kHz~5 MHz frequency synthesis,phasicdetection and dual-integral A/D transforming.
    阻抗测量采用矢量电压法,其中包括自动平衡电桥测量阻抗1、0 kHz~5 MHz频率合成、相敏鉴波和双斜A/D转换等技术。
    The design of the instrument is compact,the accuracy of measurement is high,relative error of the system is less than 0.5%.
    该仪器整体设计结构简单、测量精度高,经测定系统相对误差小于0.5%。
    In the designed hardware, AT89C51 single chip computer and many kinds of new type circuit chip (including: special power measuring chip-CS5460A, DS1302 calendar/clock chip, SMS0601 LCD, X5045 serial memory) are used for design. The hardware circuit is simplified, the meter's anti-interference ability is enhanced and the precision of measurement is also advanced.
    设计中以AT89C51单片机为核心,采用多种新型集成电路芯片(包括电能计量专用芯片CS5460A、DS1302日历/时钟芯片、SMS0601液晶显示器、X5045串行存储器)进行接口设计,简化了硬件电路,提高了电能表的抗干扰能力和测量精度。
    4) High accuracy of measurement is assured.
    4.这种方法保证了较高的测量准确度。
    A series of experiments show that the uncertainty of this multiplier for power measurement is less than 1×10-3 at a power factor of 0.1 and within a frequency range of 40Hz to 3.1kHz.
    实验表明此电压乘法器在功率因数等于0.1、频率在40Hz~3.1kHz时的功率测量误差小于1×10~(-3)。
    By using this power standard the microwave power can be measured at 400~8000 MHz frequency range on the power level 9~15mW. The un- certainty of measurement is within ±0.25%.
    该标准能在400~8000MHz频率范围内准确地测量微波功率,其不确定度为±0.25%,测量的功率电平为9~15mW.
    The flux measurement is conducted by V-F conversion techniques with zero pre-bias and by the principle of digital integration.
    磁通测量采用零预偏置V-F变换技术和数字积分原理。
    By using this power standard, the effective efficiency of thermister mounts can be measured in 26.5 to 40 GHZ frequency range. The uncertainty of measurement is 0.4%.
    该标准装置能在26.5~40GHz频率范围内准确、方便地测量热敏电阻座的有效效率η,其测量不确定度为0.4%。
    Technical key to realization of the measurement is analyzed.
    分析了实现这一测量方法的技术关键。
    The network based measurement is a new direction of the measuring technology of mechanical parameters, and the virtual instrument is the base of network based measurement.
    网络化测量是机械量电测技术新的发展方向 ,而虚拟仪器是网络化测量的基础。
    The parameter of power system is measured and relay protection is set by 7330.The measurement is analysed.
    用 7330测量电力系统参数 ,设置继电保护。
    The finial conclusion is that the precision of PMU can be achieved to 1°if the accuracy of frequency tracking and measurement is ensured.
    最后得出 :在保证频率跟踪测量精度的前提下 ,PMU的相角测量精度可以达到 1°。
    Modern microwave measurement is an important part of the microwave subject.
    从微波测量仪器、测量技术及测量分析出发 ,简单地阐述了现代微波测量发展的趋势。
    Considering the effects of electromagnetic coupling between transmission lines, a two parallel wire to earth model is put forward based on the telegraph equation Online parameter calculating formulas based on data collected at both ends of the lines are derived A novel method of online parameter measurement is presented based on this principle Its application in power system is also studied
    考虑传输线之间的电磁耦合作用 ,以电报方程为基础 ,推导两线 -地耦合传输线的数学模型 ,得出基于首、末端电气量的耦合传输线参数在线测量的计算公式 ,并提出一种全新的在线测量耦合传输参数的原理及方法 ,并讨论了该方法在电力系统中的应用。
    The electric energy measurement error in active energy measurement is less then 0.1% over a dynamic range of 1000 to 1 at 25°C.
    在25°C的温度条件下和1到1000的测量动态范围内,电能表的有功电能测量误差小于0.1%。
    The experiment shows that the power system can work well as the current of bus bar is above 8 A. The accuracy of current measurement is 0.2% and the whole system can satisfy the demand of current measurement in power system.
    母线电流>8 A时电源系统能正常供电,测量误差<0.2%,能满足电力系统电流测量的要求。
    This electric circuit of frequency measurement is take AT89C51 as the core. It can survey the realization cycle frequency and show the measurement result by using dynamic scan method.
    本频率测量电路是以AT89C51为核心,实现周波频率的测量及使用动态扫描的方法将测量结果显示出来。
 

首页上一页1下一页尾页 

 
CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社