电子文档交易市场
安卓APP | ios版本
电子文档交易市场
安卓APP | ios版本

电子信息类专业英语 教学课件 ppt 作者 温丹丽unit 4 unit 4 passage one

11页
  • 卖家[上传人]:E****
  • 文档编号:89164030
  • 上传时间:2019-05-19
  • 文档格式:PPT
  • 文档大小:299.51KB
  • / 11 举报 版权申诉 马上下载
  • 文本预览
  • 下载提示
  • 常见问题
    • 1、电子信息类专业英语,http:/,机械工业出版社同名教材配套电子教案,温丹丽 高源 制作,机械工业出版社 http:/,1. What are the major functions of a simple frequency counter? 2. How does the frequency counter measure frequencies?,Passage One Digital Counter and Digital Frequency Counters,Passage One Digital Counter and Digital Frequency Counters,Words and Expressions emerge v. 显现,脱出 interval n. 时间间隔 auto ranging 自动量程,机械工业出版社 http:/,Passage One Digital Counter and Digital Frequency Counters,Text Electronic Digital Counter Common to all digital ins

      2、truments is the electronic digital counter. The electronic counter, most often thought of as a device that totalizes input events, is the basic building block for all digital test and measurement applications. The digital counter has come a long way since it first appeared on the commercial marked. Even in its original form it was recognized as perhaps the most useful measuring instrument to emerge from the laboratory since the oscilloscope. The original application of the digital counter was th

      3、at of a frequency counter.,机械工业出版社 http:/,Passage One Digital Counter and Digital Frequency Counters,The main gate is nothing more than a logic AND circuit. When both the input conditioning and main-gate flip-flop are logically true, the main gate opens for a period of time that is determined by the timer base divider. While the main gate is open, the conditioned input signal pulses are passed through to the counting register, where they are tallied and then scaled for output by the display circ

      4、uitry. At the end of the counting period, the main gate is closed and counter reset for the next sampling period.,机械工业出版社 http:/,Passage One Digital Counter and Digital Frequency Counters,Digital Frequency Counter When the main gate is controlled by an accurate time interval, the counter is in the frequency mode. The frequency mode is similar to the totalize mode described above, with the difference being in the way the gate control is operated. For frequency measurements, the counting time inte

      5、rval is precisely controlled to be multiples of a second. If, for example, 45,500 pulses pass through to the counting register while the main gate remains open for one second, then the input signal frequency is 45.5 kHz. Depending on the number of digits in the read out, this number could be directly or expressed as powers of ten.,机械工业出版社 http:/,Passage One Digital Counter and Digital Frequency Counters,To measure frequencies that would otherwise exceed the maximum count of the counting register

      6、, the time interval of the main gate can be reduced, with an appreciate change made to the scale factor. A similar number of pulses (45,500) accumulating in the counting register within a 0.1 second period, for example, would represent a frequency of 455 kHz; 25,000 pulses counter within 10s is 2.5MHz, and so forth. Scaling can be done automatically by the positioning of the decimal point on the digital read out, as the timer base period is switched from range to range.,机械工业出版社 http:/,Passage On

      7、e Digital Counter and Digital Frequency Counters,Instead of manually switching to the appropriate timer range, some instruments have an automatic range selection system called auto ranging. The ranger usually consists of a circuit that generates voltage level; one of several transistor switches is turned on to select the correct timer base and decimal point position. Using the frequency counter as a frequency meter, however, is exploiting but one of its several electronic counter functions. A co

      8、unter can also indicate the period of an input signal, compare two signals in the ratio mode, indicate the time between two points on a waveform, or do reciprocal counting.,机械工业出版社 http:/,Passage One Digital Counter and Digital Frequency Counters,Exercises . Match the items listed in the following two columns. 1. electronic digital counter a. 计数寄存器 2. main gate b. 频率计数器 3. counting register c. 采样周期 4. frequency counter d. 电子数字计数器 5. sampling period e. 主控门,机械工业出版社 http:/,Passage One Digital Count

      9、er and Digital Frequency Counters,. Complete the following sentences according to the text. 1. is the basic building block for all digital test and measurement applications. 2. The main gate is a logic circuit. 3. While the main gate is open, the conditioned input signal pulses are passed through to the , where they are tallied and then scaled for output by . 4. To measure frequencies that would otherwise exceed the maximum count of , the time interval of the main gate can be reduced, with an appreciate change made to the scale factor.,机械工业出版社 http:/,Class is over!,Have a rest!,追 求,机械工业出版社 http:/,

      《电子信息类专业英语 教学课件 ppt 作者 温丹丽unit 4 unit 4 passage one》由会员E****分享,可在线阅读,更多相关《电子信息类专业英语 教学课件 ppt 作者 温丹丽unit 4 unit 4 passage one》请在金锄头文库上搜索。

      点击阅读更多内容
    最新标签
    发车时刻表 长途客运 入党志愿书填写模板精品 庆祝建党101周年多体裁诗歌朗诵素材汇编10篇唯一微庆祝 智能家居系统本科论文 心得感悟 雁楠中学 20230513224122 2022 公安主题党日 部编版四年级第三单元综合性学习课件 机关事务中心2022年全面依法治区工作总结及来年工作安排 入党积极分子自我推荐 世界水日ppt 关于构建更高水平的全民健身公共服务体系的意见 空气单元分析 哈里德课件 2022年乡村振兴驻村工作计划 空气教材分析 五年级下册科学教材分析 退役军人事务局季度工作总结 集装箱房合同 2021年财务报表 2022年继续教育公需课 2022年公需课 2022年日历每月一张 名词性从句在写作中的应用 局域网技术与局域网组建 施工网格 薪资体系 运维实施方案 硫酸安全技术 柔韧训练 既有居住建筑节能改造技术规程 建筑工地疫情防控 大型工程技术风险 磷酸二氢钾 2022年小学三年级语文下册教学总结例文 少儿美术-小花 2022年环保倡议书模板六篇 2022年监理辞职报告精选 2022年畅想未来记叙文精品 企业信息化建设与管理课程实验指导书范本 草房子读后感-第1篇 小数乘整数教学PPT课件人教版五年级数学上册 2022年教师个人工作计划范本-工作计划 国学小名士经典诵读电视大赛观后感诵读经典传承美德 医疗质量管理制度 2 2022年小学体育教师学期工作总结 2022年家长会心得体会集合15篇
    关于金锄头网 - 版权申诉 - 免责声明 - 诚邀英才 - 联系我们
    手机版 | 川公网安备 51140202000112号 | 经营许可证(蜀ICP备13022795号)
    ©2008-2016 by Sichuan Goldhoe Inc. All Rights Reserved.