【正文】
better known as a dual slope converter or integrating converter. This type of converter is generally preferred over other types as it offers accuracy, simplicity in design and a relative indifference to noise which makes it very reliable. The operation of the circuit is better understood if it is described in two stages. During the first stage and for a given period the input voltage is integrated, and in the output of the integrator at the end of this period, there is a voltage which is directly proportional to the input voltage. At the end of the preset period the integrator is fed with an internal reference voltage and the output of the circuit is gradually reduced until it reaches the level of the zero reference voltage. This second phase is known as the negative slope period and its duration depends on the output of the integrator in the first period. As the duration of the first operation is fixed and the length of the second is variable it is possible to pare the two and this way the input voltage is in fact pared to the internal reference voltage and the result is coded and is send to the display. back side All this sounds quite easy but it is in fact a series of very plex operations which are all made by the ADC IC with the help of a few external ponents which are used to configure the circuit for the job. In detail the circuit works as follows. The voltage to be measured is applied across points 1 and 2 of the circuit and through the circuit R3, R4 and C4 is finally applied to pins 30 and 31 of the IC. These are the input of the IC as you can see from its diagram. (IN HIGH amp。0187。171。 檢查您的故障或損壞的部件項(xiàng)目。 零件清單 R1=180k P1=2 萬(wàn)多轉(zhuǎn)微調(diào) R2=22k U1=ICL7107 R3=12k LD1, 2,3,4=MAN6960共陽(yáng)極 LED 顯示屏 R4=1M R5=470k R6=560 Ohm C1=100pF C2,C6,C7=100nF C3=47nF C4=10nF C5=220nF 5 故障檢查簡(jiǎn)介 檢查您可能造成的虛焊,跨越鄰近軌道或助焊劑殘留物的橋梁工作,通常會(huì)造成問(wèn)題。盡量避免用你的手接觸引腳,并且保持地面電路和你的身體電位在你插入的位置。 當(dāng) 你 完成 你 的工作 時(shí) ,切斷組件的多余 部分 和用適當(dāng)?shù)娜軇﹣?lái) 徹底 清除 可能還留在電路板上的 助焊劑殘留物。如果焊料看起來(lái)暗淡無(wú)光,有裂痕的,或有一個(gè)氣泡的形狀,那么你虛焊了和你應(yīng)該清除焊 接劑 (用泵,或焊芯 )然后重做它。 當(dāng)焊錫絲開(kāi)始融化和流動(dòng)等待它均勻覆蓋孔周圍的區(qū)域和通量癤并且焊料從下面流出。在這種情況下使用的小型鉆孔略有放大。但如果您必須使用額外的流量,因?yàn)樗?在 你 不得不將銅線 鍍 錫 的情況下 , 將起徹底清除干凈后你完成了你的工作。 如果烙鐵 尖 不能清洗 或 更換 , 請(qǐng)勿 用 文件或砂紙 弄 臟或磨損 其尖部 。這項(xiàng)工作也并不是很困難,如果你堅(jiān)持有一些規(guī)則你應(yīng)該沒(méi)有問(wèn)題。該印刷電路板是由薄絕緣銅的導(dǎo)電復(fù)合材料薄層形成, 這樣 以形成電路之間的各組成部分的必要的導(dǎo)體。至于我們上面已經(jīng)提到的芯片它能夠驅(qū)動(dòng) 4 個(gè)共陽(yáng)極 LED 顯示屏。電容 C3 和電阻 R5 在一起的電路是輸入電壓的集成電路,同時(shí)它可避免任何使電路更快的分裂輸入電壓,從而使錯(cuò)誤的可能性大大減少進(jìn)而使電路更穩(wěn)定。從下圖你可知這是該集成電路的輸入 (分別為高與低 )。作為第一個(gè)操作時(shí)間是固定的,第二個(gè)變量的長(zhǎng)度就可以比較兩個(gè) 這樣的輸入電壓,其實(shí)是相對(duì)于內(nèi)部參考電壓,其結(jié)果是編碼,然后發(fā)送到顯示。如果將電路分兩個(gè)階段描述,該電路的操作將更好的理解。 它有一個(gè)內(nèi)置的時(shí)鐘 。 3 數(shù)字電壓表的基本原則 為了了解電路的運(yùn)作的原則,說(shuō)明 ADC 的集成電路工程是必要的。 成本低。 (3) 測(cè)量范圍: .............+ / 01,999V在四個(gè)范圍 。在 IC 中內(nèi)置的電路是數(shù)字轉(zhuǎn)換器,比較器,一個(gè)時(shí)鐘,一個(gè)解碼器和一個(gè) 7 段 LED 顯示 驅(qū)動(dòng)器模擬。 簽名: 年 月 日 (用外文寫(xiě) ) 附件 1:外文資料翻譯譯文 LED 顯示屏的數(shù)字電壓表 來(lái)源:智能工具包 1 引言 這是一個(gè)很容易建立并且非常準(zhǔn)確和有用的數(shù)字電壓表。 指導(dǎo)教師評(píng)語(yǔ): 所選文獻(xiàn)與課題密切相關(guān),翻譯字?jǐn)?shù)符合要求,譯文意思與原文基本符合,語(yǔ)句較通順,反映作者已具備一定的外文文獻(xiàn)閱讀與翻譯能力。該 IC 采用 40 引腳的情況下整合了所有必要的電路模擬