Lesson 10 Digital Instruments.ppt

1、Lesson 10 Digital Instrument, Backgrounds Text tour Language in use Vocabulary Structure Reading/writing techniques,2020/8/11,1,测控技术与仪器英语教程,Backgrounds, Terminology digital instruments 数字仪器 digital displays 数字显示器 digital counter 数字计数器 signal conversion 信号转换 time base oscillator 时基振荡器 time base divid

2、ers 时基分配器 counting register 计数寄存器 operation mode 操作模式 Digital Voltmeters 数字伏特计 signal period 信号周期 timing diagram 时序图,2020/8/11,2,测控技术与仪器英语教程,Text tour, Outline 10.0 Advantage of Digital Instruments 10.1 Digital Displays 10.2 Electronic Digital Counter 10.3 Input Signal Conditioning 10.4 Timerbase Os

3、cillator 10.5 Timerbase Dividers 10.6 Counting Register 10.7 Digital Voltmeters,2020/8/11,3,测控技术与仪器英语教程,10.0 Advantages of Digital Instruments, The digital instruments is a truly objective readout which are not influenced by visual and psychological perception of viewers .,2020/8/11,4,测控技术与仪器英语教程,10

4、.1 Digital Displays, a variety of digital displays The first digital display devices were mechanical incandescent lamp display Gas-discharge plasma readouts emit light fluorescent readout Electroluminescent display light emitting diodes liquid-crystal displays,2020/8/11,5,测控技术与仪器英语教程,10.2 Electronic

5、 Digital Counter, functional definition The digital 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 application of the digital counter frequency counter seven major functions of frequency count

6、er,2020/8/11,6,测控技术与仪器英语教程,10.2 Electronic Digital Counter, seven major functions of frequency counter input signal conversion timerbase oscillator main-gate flip-flop timerbase dividers main gate counting register readout display Figure 10.1 Electronic digital counter block diagram,2020/8/11,7,测控技术

7、与仪器英语教程,10.3 Input Signal Conversion, the input signal is conditioned to remove unwanted noise and make the signal level compatible with the internal digital processing circuitry , so the input must pass through many conditioning circuits before it is fully conditioned .,Figure 10.2 Signal condition

8、er block diagram,2020/8/11,8,测控技术与仪器英语教程,10.4 Timerbase Oscillator, The timerbase oscillator is an accurate crystal oscillator that drivers the timerbase dividers. Temperature is the natural enemy of any oscillator. The frequency stability of an oscillator is directly dependent on the temperature st

9、ability of the tuned- circuit components,2020/8/11,9,测控技术与仪器英语教程,10.5 Timerbase Dividers, The timerbase dividers contains a bank of decade counters, each of which dividers the input frequency by 10.,Figure 10.3 Timerbase oscillator and dividers,2020/8/11,10,测控技术与仪器英语教程,10.6 Counting Register, The co

10、unting register is an array of decade counters that count and tally the digital pulses. Each display digit has its own decade counter, which consists of a latch circuit and a BCD to seven-segment decoder.,Figure 10.4 Counting register,2020/8/11,11,测控技术与仪器英语教程,10.6.1 Digital Frequency Counters, frequ

11、ency counter is the original application of the digital counter. When the main gate is controlled by an accurate time interval, the counter is in the frequency mode . use the main gate to control the time space and then measure the pulses which through the counter register the reconfiguration of the

12、 basic counter period mode ratio mode time interval mode and phase measurements,2020/8/11,12,测控技术与仪器英语教程,10.6.2 Period Mode, In this mode, the counting register counts pulses from the timerbase oscillator, and the input signal is used to enable the main-gate flip-flop .,Figure 10.5 period mode,2020/

13、8/11,13,测控技术与仪器英语教程,10.6.3 Ratio Mode, In the ratio mode, the ratio of two input signals is displayed on the counter readout,Figure 10.6 ratio mode,2020/8/11,14,测控技术与仪器英语教程,10.6.4 Time Interval Mode and Phase Measurements, The time interval mode permits the counting of any number of events occurring

14、 between any two points in time . A special application of the time interval mode is phase measurement.,Figure 10.7 Time interval mode,2020/8/11,15,测控技术与仪器英语教程,10.6.4 Time Interval Mode and Phase Measurements,The phase interval of time measurement is possible with a more elaborate gate control.,Figu

15、re 10.8 Phase mode timer control,2020/8/11,16,测控技术与仪器英语教程,10.7 Digital Voltmeters, The digital voltmeters is perhaps the most prolific of all digital test instruments. methods of analog-to-digital conversion Voltage to frequency integrating Single ramp Dual-slope integrating Successive approximation

16、 potentiometeric Continuous balance potentiometeric,2020/8/11,17,测控技术与仪器英语教程,Language in use,Vocabulary digital, counter, oscillator, divider,frequency Structure Reading/writing techniques,2020/8/11,18,测控技术与仪器英语教程,digital in dictionary, 数字的,数位的,手指的,计数的 数字, 数字式 手指,琴键,2020/8/11,19,测控技术与仪器英语教程,digital

17、in text, The first digital display devices were mechanical, made up of numbered wheels and driven by servo-controlled motors. 第一台数字显示器是机械结构的，由一定数目的被伺服 控制发动机驱动的齿轮组成。 The digital readout, on the other hand, is a truly objective one, with all users perceiving the same indication. 另一方面，数字指示器是真正客观的读出器，对所

18、有的 用户可以得到相同的指示。,2020/8/11,20,测控技术与仪器英语教程,digital in use, analog digital 摸拟数字 sound signal digital 声信号数字 cascade digital 级联数字 Arabic digital 阿拉伯数字码 analog-to-time-to digital 模拟-时间-数字转换,2020/8/11,21,测控技术与仪器英语教程,counter in dictionary, 相反的， 反对的； 反击的； 背后的； 背面的； 副本 和.相反， 反对， 提出抗衡的计划； 反驳； 抗辩 阻遏 计算器, 计数器, 计

19、算者, 柜台, 筹码 （鞋底的）后跟； (马的)前胸部； (船尾的)突出部 （拳击）回击 副轴； 中间轴； 副斜杆， 对角布置的斜杆,2020/8/11,22,测控技术与仪器英语教程,counter in text, Common to all digital instruments is the electronic digital counter. 所有数字仪器共同的是电子数字计数器 frequency counter 频率计数器 decade counter 十进制计数器,2020/8/11,23,测控技术与仪器英语教程,counter in use, run counter to 与.

20、相抵触， 违反 counter-electrode 反电极 counter-cargo 回头货 counter-dam 副坝，辅坝，前坝，抗蚀墙,2020/8/11,24,测控技术与仪器英语教程,oscillator in dictionary, 摇摆者 【电】振荡器; 震动器; 振动子, 发生器; 加速器 振荡管; 振荡部 【物】振子,2020/8/11,25,测控技术与仪器英语教程,oscillator in text, timerbase oscillator 时基振荡器 crystal oscillator 晶体振荡器,2020/8/11,26,测控技术与仪器英语教程,oscillat

21、or in use, high-frequency oscillator 高频振荡器 all-wave oscillator 全波振荡器 audio oscillator 声频振荡器 balanced oscillator 平衡振荡器 beating oscillator 拍频振荡器 bias oscillator 偏置振荡器 bridge type oscillator 桥式振荡器 control oscillator 控制振荡器 coupled oscillator 耦合振荡器 differential oscillator 差分振荡器,2020/8/11,27,测控技术与仪器英语教程,divider in dictiona