基于at89c51單片機(jī)的數(shù)字電壓表設(shè)計(jì)外文翻譯-wenkub
2022-11-02 13:33:44 本頁(yè)面
【正文】 on and allow the solder to cool naturally without blowing on it or moving the ponent. If everything was done properly the surface of the joint must have a bright metallic finish and its edges should be smoothly ended on the ponent lead and the board track. If the solder looks dull, cracked, or has the shape of a blob then you have made a dry joint and you should remove the solder (with a pump, or a solder wick) and redo it. Take care not to overheat the tracks as it is very easy to lift them from the board and break them. When you are soldering a sensitive ponent it is good practice to hold the lead from the ponent side of the board with a pair of longnose pliers to divert any heat that could possibly damage the ponent. Make sure that you do not use more solder than it is necessary as you are running the risk of shortcircuiting adjacent tracks on the board, especially if they are very close together. When you finish your work, cut off the excess of the ponent leads and clean the board thoroughly with a suitable solvent to remove all flux residues that may still remain on it. For the replacement resistors follow the table below: 0 2 V ............ R3 = 0 ohm 1% 0 20 V ........... R3 = Kohm 1% 0 200 V .......... R3 = 12 Kohm 1% 0 2020 V ......... R3 = 120 Kohm 1% When you have finished all the soldering on the board and you are sure that everything is OK you can insert the IC in its place. The IC is CMOS and is very sensitive to static electricity. It es wrapped in aluminium foil to protect it from static discharges and it should be handled with great care to avoid damaging it. Try to avoid touching its pins with your hands and keep the circuit and your body at ground potential when you insert it in its place. Connect the circuit to a suitable power supply ρ 5 VDC and turn the supply on. The displays should light immediately and should form a number. Short circuit the input (0 V) and adjust the trimmer P1 until the display indicates exactly 171。 樣品電源 1 樣品電源 2 6 結(jié)論 一個(gè)配備自動(dòng)檢查和校準(zhǔn)的電壓表減少了實(shí)驗(yàn)所校正的必要，因?yàn)樗且粋€(gè)偶爾為了更好的參考電壓而校正的參考單元。再次檢查所有的電路和外部連接，看看是否有一個(gè)錯(cuò)誤。 電路連接到一個(gè)合適的電源 ρ5 伏直流電上，開(kāi)啟電源。 更換的電阻按照下表： 0 2V............ R3 = 0 歐姆 1％ 0 20V........... R3 = 千歐 1％ 0 200V.......... R3 = 12 千歐 1％ 0 2020V......... R3 = 120 千歐 1％ 當(dāng)您完成所有的電路板上焊接和您確信一切正常，可以插入在其位芯片。 注意不要過(guò)熱的軌道，因?yàn)樗呛苋菀?從其電路板上 解除 從而損壞電路板。整個(gè)過(guò)程不應(yīng)超過(guò) 5 秒。不要使孔太大，因?yàn)檫@將會(huì)使焊接困難。 為了焊接組件正確，您應(yīng)該執(zhí)行下列操作： 用一小塊砂紙清潔清潔組件。 在 市場(chǎng)上 有許多不同類型的焊接 劑 ，你應(yīng)該選擇一個(gè)優(yōu)質(zhì)的一個(gè)在其核心包含 必 需 的 流量 的 焊接劑 ，以保證每次 焊接時(shí)都能 完美的 接 合。 在你使用 電烙鐵 時(shí) ，其 功率 不應(yīng)超過(guò) 25 瓦。一個(gè)設(shè)計(jì)完善的印刷電路板是非?？扇〉模?yàn)樗蟠蠹涌炝?加 工，并大大減少了決策失誤的可能性。這三個(gè)最右邊的顯示器相連，使他們可以顯示所有從 0 到 9 的數(shù)字，而從左邊第一個(gè)只能顯示數(shù)字 1，當(dāng)電壓為負(fù) “ ” 的時(shí)候。在沒(méi)有輸入電壓時(shí)電容器 C5 強(qiáng)迫儀器顯示為零。 R1 電阻的 C1 一起用來(lái)設(shè)置內(nèi)部振蕩器 (時(shí)鐘 )，該設(shè)置約 48Hz。 示意圖（固定 161109） 7 段顯示器引出線 MAN6960 這一切聽(tīng)起來(lái)很容易，但實(shí)際上它是一系列非常復(fù)雜的操作，這些都是由ADC 集成電路 作出 了很少的外部元件，幫助它們用來(lái)配置工作的電路。在第一階段的輸入集成電壓和最后階段的輸出集成電壓中有一個(gè)電壓與輸入電壓成正比。 它不需要精度高的外部元件。該集成電路具有以下非常重要的特點(diǎn)： 準(zhǔn)確性 。 簡(jiǎn)單的調(diào)整。 (4) 精度： .................％ 。在這里它描述了一個(gè)可以顯示在01999 電壓范圍的直流電壓電路。它被設(shè)計(jì)成一個(gè)面板儀表，可用于直流電源供應(yīng)
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