產品介紹：

智能全自動三相電容電感測試儀，具有測量工作量小、快捷簡便、性能穩定、測量準確、故障檢出率高 等特點。此外，它的電流測量單元還可兼作CVT、避雷器等電器設備的測量之用 ，具有一機多能的功效。

產(chan)品功能：

1、量程自動轉換；
2、儲存2000個測試數據；
3、大屏幕液晶（320×240 LCD）顯示, 漢字菜單操作提示；
4、實現波形和測量處理數據同屏顯示，使測試過程更直觀；
5、智能全自動三相電容電感測試儀具有設置、校正和調試功能。

產(chan)品參數(shu)：

1、電容量量程：  0.2μF～2,000μF；
容量范圍： 5～20,000 kvar；
測量精度： 0.2μF～2μF    ±1%讀數±0.02μF；
2μF～2,000μF  ±1%讀數±2個字；
2、電感量程：    1mH～9.99H；測量精度：±1.5%讀數±2個字
3、輸出測量電壓：AC 26V/500VA；50Hz；
4、顯示方式 ：   大屏幕液晶示屏全漢字輸出，TPμp-40面板式熱敏打印機
5、外形 / 重量 ：370×370×220 mm / 16 kg
6、工作條件
a. 環境溫度： 0℃ ～ +40℃，相對濕度：≤90%
b. 電    源： AC 220V±10%；50Hz； 

接線方法：

電(dian)阻(zu)、電(dian)容、電(dian)感(gan)(gan)測試儀的設(she)計可用(yong)多種方案完成，例如利用(yong)模擬(ni)電(dian)路(lu)，電(dian)阻(zu)可用(yong)比(bi)例運(yun)算(suan)器(qi)法(fa)和(he)(he)積分運(yun)算(suan)器(qi)法(fa)，電(dian)容可用(yong)恒(heng)流法(fa)和(he)(he)比(bi)較(jiao)(jiao)法(fa)，電(dian)感(gan)(gan)可用(yong)時間常數(shu)發和(he)(he)同(tong)步分離法(fa)等、使(shi)用(yong)可編程邏輯(ji)控制器(qi)(PLC)、振蕩電(dian)路(lu)與(yu)單(dan)片(pian)機結(jie)合(he)或CPLD與(yu)EDA相(xiang)結(jie)合(he)等等來實現。在設(she)計前對各種方案進行(xing)了比(bi)較(jiao)(jiao):

1)利(li)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)純模(mo)擬電(dian)(dian)(dian)(dian)(dian)路(lu) 雖(sui)然避(bi)免了編(bian)程(cheng)(cheng)的(de)(de)麻煩，但(dan)電(dian)(dian)(dian)(dian)(dian)路(lu)復雜(za)，所用(yong)(yong)(yong)(yong)(yong)(yong)(yong)器(qi)件(jian)(jian)較(jiao)多，靈活(huo)性(xing)差，測(ce)量(liang)精度(du)低，現(xian)在已較(jiao)少使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)。2)可(ke)編(bian)程(cheng)(cheng)邏(luo)輯控(kong)(kong)制(zhi)器(qi)(PLC) 應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)廣泛(fan)，它能(neng)(neng)(neng)夠非常(chang)方便地集成(cheng)(cheng)到工業控(kong)(kong)制(zhi)系(xi)(xi)統(tong)(tong)(tong)(tong)中。其速度(du)快(kuai)，體(ti)積小，可(ke)靠性(xing)和(he)精度(du)都(dou)較(jiao)好，在設計中可(ke)采用(yong)(yong)(yong)(yong)(yong)(yong)(yong)PLC對硬(ying)件(jian)(jian)進行控(kong)(kong)制(zhi)，但(dan)是(shi)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)PLC實(shi)現(xian)價(jia)格相對昂貴，因而(er)(er)成(cheng)(cheng)本過高(gao)。 3)采用(yong)(yong)(yong)(yong)(yong)(yong)(yong)CPLD或FPGA實(shi)現(xian) 應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)目前(qian)廣泛(fan)應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)的(de)(de)VHDL硬(ying)件(jian)(jian)電(dian)(dian)(dian)(dian)(dian)路(lu)描述語(yu)言(yan)，實(shi)現(xian)電(dian)(dian)(dian)(dian)(dian)阻，電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)，電(dian)(dian)(dian)(dian)(dian)感測(ce)試儀的(de)(de)設計，利(li)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)MAXPLUSII集成(cheng)(cheng)開發環境進行綜合(he)、仿真，并下(xia)載到CPLD或FPGA可(ke)編(bian)程(cheng)(cheng)邏(luo)輯器(qi)件(jian)(jian)中，完成(cheng)(cheng)系(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)控(kong)(kong)制(zhi)作用(yong)(yong)(yong)(yong)(yong)(yong)(yong)。但(dan)相對而(er)(er)言(yan)規(gui)模(mo)大，結構(gou)復雜(za)。4)利(li)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)振(zhen)蕩(dang)電(dian)(dian)(dian)(dian)(dian)路(lu)與單片機(ji)結合(he) 利(li)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)555多諧振(zhen)蕩(dang)電(dian)(dian)(dian)(dian)(dian)路(lu)將電(dian)(dian)(dian)(dian)(dian)阻，電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)參數(shu)轉化(hua)為(wei)(wei)頻率，而(er)(er)電(dian)(dian)(dian)(dian)(dian)感則是(shi)根據(ju)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)三點式電(dian)(dian)(dian)(dian)(dian)路(lu)也(ye)轉化(hua)為(wei)(wei)頻率，這樣就能(neng)(neng)(neng)夠把模(mo)擬量(liang)近似的(de)(de)轉換為(wei)(wei)數(shu)字量(liang)，而(er)(er)頻率f是(shi)單片機(ji)很容(rong)(rong)易處理(li)的(de)(de)數(shu)字量(liang)，一方面測(ce)量(liang)精度(du)高(gao)，另一方面便于使(shi)(shi)儀表實(shi)現(xian)自(zi)動化(hua)，而(er)(er)且單片機(ji)構(gou)成(cheng)(cheng)的(de)(de)應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)系(xi)(xi)統(tong)(tong)(tong)(tong)有較(jiao)大的(de)(de)可(ke)靠性(xing)。系(xi)(xi)統(tong)(tong)(tong)(tong)擴展、系(xi)(xi)統(tong)(tong)(tong)(tong)配置靈活(huo)。容(rong)(rong)易構(gou)成(cheng)(cheng)各種規(gui)模(mo)的(de)(de)應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)系(xi)(xi)統(tong)(tong)(tong)(tong)，且應(ying)(ying)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)系(xi)(xi)統(tong)(tong)(tong)(tong)有較(jiao)高(gao)的(de)(de)軟、硬(ying)件(jian)(jian)利(li)用(yong)(yong)(yong)(yong)(yong)(yong)(yong)系(xi)(xi)數(shu)。單片機(ji)具有可(ke)編(bian)程(cheng)(cheng)性(xing)，硬(ying)件(jian)(jian)的(de)(de)功(gong)能(neng)(neng)(neng)描述可(ke)*在軟件(jian)(jian)上實(shi)現(xian)，而(er)(er)且設計時間短，成(cheng)(cheng)本低，可(ke)靠性(xing)高(gao)。

智(zhi)能款(kuan)全自動三相電容電感測試(shi)(shi)儀綜上所述(shu)，利用振蕩電路(lu)與(yu)單(dan)片(pian)機結合實現電阻、電容、電感測試(shi)(shi)儀更為(wei)(wei)簡便可行，節約成(cheng)本(ben)。所以(yi)，本(ben)次設計(ji)選定(ding)以(yi)單(dan)片(pian)機為(wei)(wei)核心來(lai)進行。

系(xi)統(tong)的(de)原理(li)框圖：

本設(she)(she)計中，考(kao)慮到單片(pian)機(ji)具有物美價廉、功能(neng)強、使用方(fang)便靈活、可靠性 高等特(te)點(dian)，擬采用MCS - 51系列的(de)單片(pian)機(ji)為核心(xin)來實現電(dian)阻、電(dian)容、電(dian)感測試儀的(de)控制(zhi)。系統分四(si)大部分:測量(liang)電(dian)路、控制(zhi)電(dian)路、通道(dao)選擇和(he)顯(xian)示電(dian)路。通過P1.3和(he)P1.4向模擬開(kai)關送兩位地址(zhi)信號，取得(de)相應的(de)振(zhen)蕩頻(pin)(pin)率，然后(hou)根據所測頻(pin)(pin)率判斷是(shi)否轉換量(liang)程(cheng)，或者是(shi)把數據進行處理后(hou)，得(de)出相應的(de)參數值。系統設(she)(she)計框圖(tu)如圖(tu)2-1如下所示。

框(kuang)圖各部(bu)分(fen)說明(ming)如下:(1)控制部(bu)分(fen):本(ben)(ben)設(she)計以單片(pian)機(ji)為核心，采用89C51單片(pian)機(ji)，利(li)(li)用其管腳的(de)(de)特殊功能以及所具備的(de)(de)中斷系統，定時/計數(shu)器等。液晶(jing)顯示屏1602。鍵(jian)盤:本(ben)(ben)設(she)計中有(you)Sr，Sc，SL三(san)個按鍵(jian)，可靈活控制不同測量參(can)數(shu)的(de)(de)切換，實現(xian)一鍵(jian)測量。(2)通(tong)道選(xuan)擇(ze):本(ben)(ben)設(she)計通(tong)過開關(guan)選(xuan)擇(ze)輸入到單片(pian)機(ji)中，單片(pian)機(ji)通(tong)過信號(hao)判斷相應顯示。(3)測量電(dian)路(lu):RC震蕩電(dian)路(lu)是利(li)(li)用555振蕩電(dian)路(lu)實現(xian)被(bei)測電(dian)阻(zu)和被(bei)測電(dian)容(rong)頻(pin)率化(hua)。電(dian)容(rong)三(san)點(dian)(dian)式(shi)振蕩電(dian)路(lu)是利(li)(li)用電(dian)容(rong)三(san)點(dian)(dian)式(shi)振蕩電(dian)路(lu)實現(xian)被(bei)測電(dian)感參(can)數(shu)頻(pin)率化(hua)。

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