電橋電容率介電常數測試儀主要采用(yong)電(dian)(dian)(dian)(dian)(dian)流(liu)比較(jiao)儀(yi)(yi)的(de)(de)(de)原理(li)，具(ju)(ju)有(you)操(cao)作(zuo)(zuo)方便可(ke)(ke)靠、測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)精(jing)度(du)(du)高(gao)、讀數(shu)(shu)位數(shu)(shu)多、線(xian)性度(du)(du)好(hao)，不(bu)(bu)受環境濕度(du)(du)影響，儀(yi)(yi)器(qi)(qi)顯(xian)示采用(yong)大(da)屏幕(mu) TFT，可(ke)(ke)顯(xian)示電(dian)(dian)(dian)(dian)(dian)容值(zhi) Cx、介損值(zhi)tgδ、試(shi)(shi)(shi)驗電(dian)(dian)(dian)(dian)(dian)壓Upk/√2 、電(dian)(dian)(dian)(dian)(dian)感(gan)量(liang)(liang)(liang)(liang)(liang)(liang)Lx、品質因數(shu)(shu)Q、測(ce)(ce)試(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)流(liu)Ix、材(cai)料(liao)(liao)(liao)的(de)(de)(de)介電(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)ε、測(ce)(ce)試(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)源頻率(lv)fx、視在(zai)功率(lv)S、有(you)效功率(lv)P、無功功率(lv)Q等(deng)，它(ta)不(bu)(bu)僅能測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)容器(qi)(qi)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容量(liang)(liang)(liang)(liang)(liang)(liang)、介損量(liang)(liang)(liang)(liang)(liang)(liang)，還能測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)抗(kang)(kang)器(qi)(qi)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)感(gan)量(liang)(liang)(liang)(liang)(liang)(liang)和(he)Q值(zhi)及固體(ti)(ti)材(cai)料(liao)(liao)(liao)和(he)液體(ti)(ti)材(cai)料(liao)(liao)(liao)的(de)(de)(de)介質損耗和(he)介電(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)，還有(you)前時鐘的(de)(de)(de)顯(xian)示，是目前國(guo)內精(jing)度(du)(du)高(gao)、穩(wen)定性好(hao)、操(cao)作(zuo)(zuo)方便、用(yong)途廣泛(fan)的(de)(de)(de)高(gao)壓電(dian)(dian)(dian)(dian)(dian)橋(qiao)(qiao)。它(ta)在(zai)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)上(shang)具(ju)(ju)有(you)很高(gao)的(de)(de)(de)比率(lv)精(jing)度(du)(du)和(he)穩(wen)定性，這(zhe)是一般西林電(dian)(dian)(dian)(dian)(dian)橋(qiao)(qiao) 、高(gao)壓介損儀(yi)(yi)不(bu)(bu)能達到的(de)(de)(de)。適宜(yi)于在(zai)高(gao)電(dian)(dian)(dian)(dian)(dian)壓下測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)纜、高(gao)壓套管、電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)容器(qi)(qi)、 電(dian)(dian)(dian)(dian)(dian)抗(kang)(kang)器(qi)(qi)、互(hu)感(gan)器(qi)(qi)等(deng)高(gao)壓電(dian)(dian)(dian)(dian)(dian)力設(she)備的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容量(liang)(liang)(liang)(liang)(liang)(liang)及損耗角正切值(zhi)tgδ，以(yi)及各種固體(ti)(ti)或液體(ti)(ti)絕緣(yuan)材(cai)料(liao)(liao)(liao)的(de)(de)(de)介電(dian)(dian)(dian)(dian)(dian)常數(shu)(shu)（ε）及介損值(zhi)tgδ，也可(ke)(ke)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)高(gao)壓變壓器(qi)(qi)或電(dian)(dian)(dian)(dian)(dian)壓互(hu)感(gan)器(qi)(qi)的(de)(de)(de)比差(cha)(cha)(cha)和(he)角差(cha)(cha)(cha)。電(dian)(dian)(dian)(dian)(dian)橋(qiao)(qiao)可(ke)(ke)外接(jie)電(dian)(dian)(dian)(dian)(dian)流(liu)互(hu)感(gan)器(qi)(qi)以(yi)擴(kuo)大(da)量(liang)(liang)(liang)(liang)(liang)(liang)程，測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)大(da) 的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)力 電(dian)(dian)(dian)(dian)(dian)容 器(qi)(qi) 時本電(dian)(dian)(dian)(dian)(dian)橋(qiao)(qiao)為四端測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)具(ju)(ju)有(you)引線(xian)補(bu)償裝(zhuang)置，使(shi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)精(jing)度(du)(du)提高(gao)，消除接(jie)線(xian)電(dian)(dian)(dian)(dian)(dian)阻引起的(de)(de)(de)附加誤差(cha)(cha)(cha)。本電(dian)(dian)(dian)(dian)(dian)橋(qiao)(qiao)還可(ke)(ke)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)抗(kang)(kang)器(qi)(qi)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)感(gan)量(liang)(liang)(liang)(liang)(liang)(liang)及Q值(zhi)。量(liang)(liang)(liang)(liang)(liang)(liang)程擴(kuo)展器(qi)(qi)（供選購）能使(shi)主橋(qiao)(qiao)體(ti)(ti)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容比從1000：1擴(kuo)大(da)到106：1。

　　技術指標

　　電(dian)容測(ce)量(liang)(liang)范圍:0.1Cn~1000Cn（7位(wei)有效數字(zi)）外接量(liang)(liang)程擴展電(dian)容量(liang)(liang)至少(shao)測(ce)到1100uF

　　電容的測量準(zhun)確度：±1×10-5

　　電橋(qiao)tgδ范(fan)圍：-110%到+110%

　　tgδ測(ce)量準確度不大于0.2%rdg±1×10-5

　　tgδ測量(liang)z小分辨率1×10-6（連接電腦可(ke)達1×10-7）

　　試驗電(dian)壓(ya)：0～1000kV，精度1%（4位有(you)效(xiao)數(shu)字(zi)）

　　測量(liang)頻率：35～65Hz，精度1Hz（4位有(you)效數字）

電橋電容率介電常數測試儀在交流(liu)電(dian)(dian)(dian)(dian)(dian)壓作(zuo)用(yong)(yong)(yong)下(xia)，電(dian)(dian)(dian)(dian)(dian)介質(zhi)(zhi)要(yao)消耗部(bu)分電(dian)(dian)(dian)(dian)(dian)能，這(zhe)部(bu)分電(dian)(dian)(dian)(dian)(dian)能將(jiang)轉(zhuan)變(bian)為(wei)熱能產生損(sun)(sun)(sun)(sun)耗。這(zhe)種(zhong)能量(liang)損(sun)(sun)(sun)(sun)耗叫做(zuo)電(dian)(dian)(dian)(dian)(dian)介質(zhi)(zhi)的(de)損(sun)(sun)(sun)(sun)耗。當電(dian)(dian)(dian)(dian)(dian)介質(zhi)(zhi)上施加(jia)交流(liu)電(dian)(dian)(dian)(dian)(dian)壓時(shi)，電(dian)(dian)(dian)(dian)(dian)介質(zhi)(zhi)中的(de)電(dian)(dian)(dian)(dian)(dian)壓和(he)(he)電(dian)(dian)(dian)(dian)(dian)流(liu)間(jian)成在相角(jiao)(jiao)差ψ，ψ的(de)余角(jiao)(jiao)δ稱為(wei)介質(zhi)(zhi)損(sun)(sun)(sun)(sun)耗角(jiao)(jiao)，δ的(de)正切tgδ稱為(wei)介質(zhi)(zhi)損(sun)(sun)(sun)(sun)耗角(jiao)(jiao)正切。tgδ值(zhi)是用(yong)(yong)(yong)來衡量(liang)電(dian)(dian)(dian)(dian)(dian)介質(zhi)(zhi)損(sun)(sun)(sun)(sun)耗的(de)參數。儀器測量(liang)線路(lu)(lu)包括一(yi)標準(zhun)回(hui)路(lu)(lu)（Cn）和(he)(he)一(yi)被試(shi)(shi)(shi)回(hui)路(lu)(lu)(Cx)，如圖2—1所示。標準(zhun)回(hui)路(lu)(lu)由(you)內(nei)置(zhi)高(gao)穩定度標準(zhun)電(dian)(dian)(dian)(dian)(dian)容器與(yu)測量(liang)線路(lu)(lu)組成，被試(shi)(shi)(shi)回(hui)路(lu)(lu)由(you)被試(shi)(shi)(shi)品(pin)和(he)(he)測量(liang)線路(lu)(lu)組成。測量(liang)線路(lu)(lu)由(you)取(qu)樣電(dian)(dian)(dian)(dian)(dian)阻與(yu)前置(zhi)放大(da)器和(he)(he)A/D轉(zhuan)換器組成。通過測量(liang)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)分別(bie)測得標準(zhun)回(hui)路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)與(yu)被試(shi)(shi)(shi)回(hui)路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流(liu)幅值(zhi)及其(qi)相位差，再由(you)數字(zi)(zi)信號(hao)處理器運用(yong)(yong)(yong)數字(zi)(zi)化實時(shi)采集(ji)方(fang)法(fa)，通過矢量(liang)運算得出試(shi)(shi)(shi)品(pin)的(de)電(dian)(dian)(dian)(dian)(dian)容值(zhi)和(he)(he)介質(zhi)(zhi)損(sun)(sun)(sun)(sun)耗正切值(zhi)。儀器內(nei)部(bu)已(yi)經采用(yong)(yong)(yong)了抗(kang)干擾措施，保證(zheng)在外電(dian)(dian)(dian)(dian)(dian)場干擾下(xia)準(zhun)確測量(liang)。