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
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