若何挑選絕緣電阻測試儀和兆歐表？

    絕緣電阻(zu)測試儀(高(gao)精度LCR測試儀)首要由三部分構成。第一個是直流(liu)(liu)高(gao)壓產(chan)生器，用于(yu)產(chan)生直流(liu)(liu)高(gao)壓。第二個是丈量(liang)電路。第三是顯現。

　　(1)直流高(gao)壓產生器

　　必須在(zai)丈(zhang)量端(duan)施加高壓(ya)以丈(zhang)量絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)阻(zu)。在(zai)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)阻(zu)測試(shi)(shi)儀(yi)的國度規范中，將該高壓(ya)值為50V，100V，250V，500V，1000V，2500V，5000v。凡是(shi)(shi)，有(you)三種(zhong)產(chan)生(sheng)直流高壓(ya)的方式。第(di)一種(zhong)是(shi)(shi)手動發機電(dian)(dian)(dian)(dian)(dian)。今朝(chao)，中國出產(chan)的絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)阻(zu)測試(shi)(shi)儀(yi)中約有(you)80%操縱(zong)這類(lei)方式(兆歐表(biao)稱號的來歷)。第(di)二種(zhong)是(shi)(shi)經由過(guo)程(cheng)電(dian)(dian)(dian)(dian)(dian)源(yuan)變壓(ya)器增(zeng)添電(dian)(dian)(dian)(dian)(dian)壓(ya)，并(bing)經由過(guo)程(cheng)整流取得直流高壓(ya)。該方式被通俗的電(dian)(dian)(dian)(dian)(dian)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)阻(zu)測試(shi)(shi)儀(yi)接納。第(di)三種(zhong)方式是(shi)(shi)操縱(zong)晶體管振蕩或的PWM電(dian)(dian)(dian)(dian)(dian)路產(chan)生(sheng)直流高壓(ya)，用于電(dian)(dian)(dian)(dian)(dian)池(chi)型(xing)和電(dian)(dian)(dian)(dian)(dian)池(chi)型(xing)絕(jue)(jue)緣電(dian)(dian)(dian)(dian)(dian)阻(zu)測試(shi)(shi)儀(yi)。

　　(2)丈量電路

　　在(zai)(zai)上述的(de)(de)絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻測(ce)(ce)試(shi)儀中，將(jiang)丈(zhang)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)和顯(xian)現(xian)部組合為(wei)一(yi)體。它由(you)一(yi)個(ge)(ge)(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流比(bi)(bi)擬(ni)(ni)器(qi)儀表(biao)(biao)完成(cheng)(cheng)(cheng)，該儀表(biao)(biao)由(you)兩個(ge)(ge)(ge)線(xian)圈構成(cheng)(cheng)(cheng)，兩個(ge)(ge)(ge)線(xian)圈的(de)(de)夾角(jiao)約為(wei)60°，此(ci)中一(yi)個(ge)(ge)(ge)在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)兩頭平行(xing)，另(ling)外一(yi)個(ge)(ge)(ge)在(zai)(zai)丈(zhang)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中串(chuan)連(lian)(lian)。唆(suo)使器(qi)指針的(de)(de)偏轉(zhuan)角(jiao)由(you)兩個(ge)(ge)(ge)線(xian)圈中的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流比(bi)(bi)肯定。差別(bie)(bie)的(de)(de)偏轉(zhuan)角(jiao)代表(biao)(biao)差別(bie)(bie)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻值。丈(zhang)量(liang)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻越(yue)小，丈(zhang)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中的(de)(de)線(xian)圈電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流就(jiu)越(yue)大(da)(da)，指針的(de)(de)偏轉(zhuan)角(jiao)就(jiu)越(yue)大(da)(da)。另(ling)外一(yi)種方式是(shi)操(cao)縱線(xian)性電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流表(biao)(biao)作為(wei)丈(zhang)量(liang)和顯(xian)現(xian)。由(you)于后面操(cao)縱的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流比(bi)(bi)擬(ni)(ni)器(qi)的(de)(de)線(xian)圈中的(de)(de)磁(ci)場不平均，以是(shi)當指針處(chu)于無(wu)窮遠時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流線(xian)圈就(jiu)位(wei)于磁(ci)通密度(du)強的(de)(de)地位(wei)，是(shi)以雖然(ran)測(ce)(ce)得(de)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻很大(da)(da)，流過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流線(xian)圈的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流很小，線(xian)圈的(de)(de)偏轉(zhuan)角(jiao)會很大(da)(da)。當測(ce)(ce)得(de)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻較(jiao)(jiao)小或(huo)為(wei)0時(shi)(shi)，流過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流線(xian)圈的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流較(jiao)(jiao)大(da)(da)，并(bing)(bing)且(qie)(qie)線(xian)圈已(yi)偏轉(zhuan)到磁(ci)通密度(du)小的(de)(de)地位(wei)，并(bing)(bing)且(qie)(qie)由(you)此(ci)引發的(de)(de)偏轉(zhuan)角(jiao)不會很大(da)(da)。如許(xu)，完成(cheng)(cheng)(cheng)了非線(xian)性校訂。通俗(su)絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻測(ce)(ce)試(shi)儀頭的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻值顯(xian)現(xian)須要逾(yu)越(yue)幾個(ge)(ge)(ge)數(shu)目級。可是(shi)在(zai)(zai)丈(zhang)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中間接串(chuan)連(lian)(lian)操(cao)縱線(xian)性電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流表(biao)(biao)并(bing)(bing)不是(shi)很好(hao)。當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻值高(gao)并(bing)(bing)且(qie)(qie)沒(mei)法辨(bian)別(bie)(bie)時(shi)(shi)，一(yi)切秤都被(bei)擠(ji)壓(ya)在(zai)(zai)一(yi)路(lu)(lu)。為(wei)了完成(cheng)(cheng)(cheng)非線(xian)性校訂，有(you)須要在(zai)(zai)丈(zhang)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)中增加非線(xian)性元件。是(shi)以，當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻較(jiao)(jiao)小時(shi)(shi)，能夠完成(cheng)(cheng)(cheng)分流結果(guo)。當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻高(gao)時(shi)(shi)，不分路(lu)(lu)，是(shi)以電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻值顯(xian)現(xian)為(wei)幾個(ge)(ge)(ge)數(shu)目級。跟著電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)子(zi)手藝和計(ji)較(jiao)(jiao)機手藝的(de)(de)成(cheng)(cheng)(cheng)長，數(shu)字絕緣電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻測(ce)(ce)試(shi)儀逐步代替指針式儀器(qi)。

　　還開辟(pi)了數(shu)(shu)字(zi)絕緣(yuan)電(dian)(dian)阻測試(shi)儀的(de)(de)丈(zhang)(zhang)(zhang)量手(shou)藝(yi)，此中電(dian)(dian)壓(ya)(ya)比擬器電(dian)(dian)路是比擬好的(de)(de)丈(zhang)(zhang)(zhang)量電(dian)(dian)路之一，它由電(dian)(dian)壓(ya)(ya)橋(qiao)和丈(zhang)(zhang)(zhang)量橋(qiao)構(gou)成。兩個電(dian)(dian)橋(qiao)的(de)(de)輸入旌旗燈號經由過程A / D轉(zhuan)換別離轉(zhuan)換為(wei)數(shu)(shu)字(zi)值(zhi)，而后經由過程單(dan)個芯片轉(zhuan)換為(wei)數(shu)(shu)字(zi)值(zhi)。

　　2.絕緣(yuan)電(dian)阻測試儀和兆歐(ou)表的挑選

　　電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)絕(jue)(jue)緣(yuan)層(ceng)(ceng)帶(dai)性濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)自測(ce)儀和兆(zhao)歐(ou)表(biao)是(shi)(shi)應(ying)用(yong)(yong)在電(dian)(dian)(dian)(dian)纜法寶電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)絕(jue)(jue)緣(yuan)層(ceng)(ceng)帶(dai)性自測(ce)的(de)側(ce)量(liang)設(she)備(bei)(bei)。電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)絕(jue)(jue)緣(yuan)層(ceng)(ceng)帶(dai)性濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)自測(ce)儀和兆(zhao)歐(ou)表(biao)是(shi)(shi)側(ce)量(liang)被測(ce)法寶的(de)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)絕(jue)(jue)緣(yuan)層(ceng)(ceng)帶(dai)性濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)和高值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)的(de)三天兩頭采用(yong)(yong)設(she)備(bei)(bei)。它是(shi)(shi)側(ce)量(liang)低壓(ya)箱式變壓(ya)器(qi)(qi)，低壓(ya)箱式變壓(ya)器(qi)(qi)，發機械設(she)備(bei)(bei)，電(dian)(dian)(dian)(dian)妄念(nian)，電(dian)(dian)(dian)(dian)機功率(lv)濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)器(qi)(qi)，避雷器(qi)(qi)等的(de)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)絕(jue)(jue)緣(yuan)層(ceng)(ceng)帶(dai)性濾(lv)(lv)(lv)(lv)波(bo)(bo)電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)類(lei)(lei)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)值(zhi)(zhi)(zhi)(zhi)(zhi)(zhi)的(de)遠大抱負設(she)備(bei)(bei)。