数字表

This paper introduces the research and implementation of all-purpose high-speed test adapter for ADC. The main contents includes two methods about how to testing the static parameters and dynamic parameters for ADC. The servo loop method is proposed to static parameters, by using the test principle of high-precision voltage source, high-precision voltage meter and digital comparator. To dynamic parameters, the DDS chip of AD9851 is used to generate sine waves with high signal to noise ratio, then the high-s...

servo loop ； FFT ；本文介绍了关于ADC高速通用测试适配器的研究和实现，主要介绍了测试ADC芯片静态参数和动态参数两种方法，针对静态参数，提出了用伺服环的方法，采用高精度电压源，高精度电压表和数字比较器的测试原理；针对动态参数，提出了用DDS芯片AD9851产生高信噪比的正弦波，采用高速采样模块采集数据，最后用FFT算法对采集的数据进行处理。

In this paper, a large number of digital voltage reference design based on the table.

本文在参考了大量数字电压表设计的基础上。

Along with the continuous development of science technique, people have more request on the digital voltmeter.

随着科学技术不断的发展，人们对数字电压表的要求也越来越高。

This is a 062 - AD0832 digital voltmeter 1602 LCD, for beginners and project development.

这是一个062-AD0832数字电压表1602液晶，适合初学者及工程开发。

Every day the water gauge tells me how many hundreds of tons of waste we have recycled. I knew what I jot down is not just a number we have to report to the supervisor.

每天从水位表可以知道我们今天用的水有多少吨是来自循环使用的废水，我明白我所记录的不只是一个必须向上级领导报告的简单数字。

Its software uses system self-detecting algorithm to assure measurement channel .It uses softening hardware technique software synchronic data sampling to trace the frequency of exterior signal, in other words , it gives sampling control signals 128 times of power net's frequency .It uses Direct Digital Frequency Synthetics algorithm to transform radical sine waveform parameter table into needed current. It uses FFT algorithm to get radical waveform altitude of current ,voltage and resistor .

整个系统在软件设计上采用系统自检验算法保证测量通道可用，采用硬件软化技术--软件锁相环技术，达到对外部信号频率的跟踪，给出频率为电网工频128倍的采样控制信号：直接数字频率合成技术将基波参数表转换成需要的电流信号，采用FFT变换及基波幅度的计算方法得到被测电流、电压基波幅度和电阻大小。

Table 3 has too many significant figures presented. Values should be rounded to the nearest whole number.

表3中已呈现了太多有效数字，数值应四舍五入为最接近的整数。

The PXI modules include:PXI-1044 AC power supplies,14 slots and 3U box,PXI-5152 digital module,PXI-4072 digital multimeter module,PXI-5422 function signal generator module,PXI-5660 RF signal analyser modult,PXI-8351 zero slot controller module , PXI-6115 multi-function DAQ module , PXI-4461 dual-channel DAQ module,PXI-2593 matrix module and so on.

根据测试的要求所选用的PXI模块包括PXI-1044交流电源14插槽3U机箱、PXI-5152数字化仪模块、PXI-4072数字多用表模块、PXI-5422函数信号发生器模块、PXI-5660 RF信号分析仪模块、PXI-8351零槽控制器、PXI-6115多功能DAQ模块、PXI-4461双路数据采集模块、PXI-2593多路复用器/矩阵模块等。

With the continuous development of science and technology,electronic test instruments awide range of applications in the field of measuring technology,digital voltage meterof rapid development,it has become ameasurement realize automation,improve the efficiency of an indispensable instrument,digital is the current measurement instrumentation,one of the main directions of development.

随着科学技术的不断发展，电子测试仪器广泛的应用在测量技术领域中，数字电压表的高速发展，使它已成为实现测量自动化、提高工作效率不可缺少的仪表，数字化是当前计量仪器仪表发展的主要方向之一。

Bbstract:With the continuous development of science and technology,electronic test instruments awide range of applications in the field of measuring technology,digital voltage meterof rapid development,it has become ameasurement realize automation,improve the efficiency of an indispensable instrument,digital is the current measurement instrumentation,one of the main directions of development.

随着科学技术的不断发展，电子测试仪器广泛的应用在测量技术领域中，数字电压表的高速发展，使它已成为实现测量自动化、提高工作效率不可缺少的仪表，数字化是当前计量仪器仪表发展的主要方向之一。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。