電路cad課程設(shè)計--頻率計(已修改)
2025-06-21 05:56 本頁面
【正文】 摘要 在電子技術(shù)中，頻率是最基本的參數(shù)，并且與許多電參量的測量方案，測量結(jié)果都有十分密切的關(guān)系，因此頻率測量就顯得更加重要。測量頻率的方法有很多種，其中 數(shù)字計數(shù)器 測量頻率具有精度高、使用方便，測量迅速，以便于是先測量過程自動化等優(yōu)點，是頻率測量的重要手段之一。 數(shù)字 計數(shù)器測頻有兩種方式：意識直接測頻法，即在一定的閘門時間內(nèi)測量被測信號的脈沖個數(shù)；而是間接測頻法，如周期測頻法。直接測頻法適用于高頻信號的測量，簡介測頻法適用于低頻信號的測量，本文敘述了間接測頻即周期測頻法測量頻率的過程。 關(guān)鍵字： 74ls160,555 定時器，矩形波發(fā)生器。 2 Abstract: In electronic technology, frequency is the most basic parameters, and with many electric parameter measurement, measurement results are very close relationship, so frequency measurement is more important. Method of measuring frequency there are a lot of kinds, including electronic technology panies measure frequency has high precision, easy to use, measurement quickly, so that the first measurement process automation, etc, is one of the important means of frequency measurement. Consciousness of electronic counter measure frequency has two ways: direct frequency measuring method, namely, in a certain gate time measurement of the measured signal pulse number。 But indirect frequency measurement method, such as the cycle frequency measuring method. Direct frequency measurement method is suitable for high frequency signal measurement, the introduction of frequency measurement method is suitable for low frequency signal measurement, this paper describes the indirect frequency measuring the cycle frequency measuring method to measure the frequency of process. 3 一、設(shè)計任務(wù)和要求 .................................................4 二、 方案選擇與論證 ..............................................
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