簡易的數字頻率計

電子信息工程論文編號:DZXX094  論文字數:11400,頁數:35

摘要 2
Abstract 3
引言 4
 第一章 測量原理 5
1.1計數式直接測頻 5
1.2計數式直接測周期 6
1.3計數式測量時間間隔 7
1.4設計設計方案選擇 9
1.5測量方法實現 10
1.6基本性能與指標 10
1.6.1基本要求 10
1.6.2發揮部分 11
第二章 總體方案設計 12
2.1輸入電路設計 12
2.2分頻器電路和三態門電路設計 14
2.3基準信號源 16
2.4　單片機電路 17
2.4.1時鐘和復位 17
2.4.2 定時/計數功能 18
2.4.3 LED的驅動電路 19
第三章 軟件設計 21
3.1頻率的測量 21
3.2周期測量 22
3.3 脈寬測量 22
3.4占空比測量 22
第四章 誤差分析 23
第五章 簡易的數字頻率計的實際情況 24
第六章 結論 25
致謝 26
參考文獻 27

摘要
 數字頻率計是一種基本的測量儀器。它被廣泛應用與航天、電子、測控等領域。它的基本測量原理是，首先讓被測信號與標準信號一起通過一個閘門，然后用計數器計數信號脈沖的個數，把標準時間內的計數的結果，用鎖存器鎖存起來，最后用顯示譯碼器，把鎖存的結果用LED數碼管顯示出來。本文主要講述了數字頻率計的工作原理以及其各個組成部分，以單片機AT89C52為核心，充分利用AT89C52中三個可編程定時/計數器，現實頻率\周期的高精度測量。
 關鍵字：單片機、頻率計
   
 AbstractThe digital cymometer is a kind of basic measuring instrument. It is widely used in such fields as the spaceflight , electron , observing and controlling ,etc. Basic measurement of it principle, is it examine signal adopt the gate together with standard signal to let at first, the number of the signal pulse that then count through the counter , latch with the latch the result of counting within standard time, use decipher display finally, number show is it is it come out to show to in charge of with LED result that latch. This article mainly narrated the digital frequency meter principle of work by and its each constituent. In this method , the Single - Chip Micro - computer AT89C52 is taken as a core part and it s three programmable timer/ counters are well used and the algorithm for measuring the waveshape period of N signals is also employed.

Key Words :  Frequency - counter ; Single - Chip Micro - computer