電橋電容率介電常數測試儀主要采(cai)用電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)比(bi)較儀(yi)(yi)的(de)(de)(de)(de)原理，具有(you)操作方(fang)便可(ke)靠、測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)精(jing)度(du)高(gao)、讀數位數多(duo)、線性度(du)好，不(bu)受(shou)環境濕(shi)度(du)影響(xiang)，儀(yi)(yi)器(qi)(qi)(qi)(qi)(qi)顯示(shi)采(cai)用大(da)屏幕 TFT，可(ke)顯示(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容值(zhi) Cx、介(jie)損(sun)(sun)值(zhi)tgδ、試(shi)驗電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)Upk/√2 、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感量(liang)(liang)(liang)(liang)Lx、品質因數Q、測(ce)(ce)(ce)試(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)Ix、材(cai)料(liao)的(de)(de)(de)(de)介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)常數ε、測(ce)(ce)(ce)試(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源頻率(lv)fx、視在功(gong)(gong)(gong)率(lv)S、有(you)效功(gong)(gong)(gong)率(lv)P、無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)Q等(deng)，它不(bu)僅(jin)能(neng)測(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容量(liang)(liang)(liang)(liang)、介(jie)損(sun)(sun)量(liang)(liang)(liang)(liang)，還(huan)能(neng)測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感量(liang)(liang)(liang)(liang)和Q值(zhi)及(ji)(ji)固(gu)體材(cai)料(liao)和液(ye)體材(cai)料(liao)的(de)(de)(de)(de)介(jie)質損(sun)(sun)耗和介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)常數，還(huan)有(you)前(qian)時鐘的(de)(de)(de)(de)顯示(shi)，是(shi)目前(qian)國內精(jing)度(du)高(gao)、穩(wen)定(ding)性好、操作方(fang)便、用途廣泛的(de)(de)(de)(de)高(gao)壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋。它在測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)上具有(you)很高(gao)的(de)(de)(de)(de)比(bi)率(lv)精(jing)度(du)和穩(wen)定(ding)性，這是(shi)一般西林電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋 、高(gao)壓(ya)介(jie)損(sun)(sun)儀(yi)(yi)不(bu)能(neng)達到的(de)(de)(de)(de)。適(shi)宜于在高(gao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)下測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜、高(gao)壓(ya)套管(guan)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容器(qi)(qi)(qi)(qi)(qi)、 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗器(qi)(qi)(qi)(qi)(qi)、互感器(qi)(qi)(qi)(qi)(qi)等(deng)高(gao)壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)設備的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容量(liang)(liang)(liang)(liang)及(ji)(ji)損(sun)(sun)耗角正切值(zhi)tgδ，以及(ji)(ji)各(ge)種固(gu)體或液(ye)體絕緣(yuan)材(cai)料(liao)的(de)(de)(de)(de)介(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)常數（ε）及(ji)(ji)介(jie)損(sun)(sun)值(zhi)tgδ，也可(ke)測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)高(gao)壓(ya)變(bian)壓(ya)器(qi)(qi)(qi)(qi)(qi)或電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)互感器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)比(bi)差和角差。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋可(ke)外接電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)互感器(qi)(qi)(qi)(qi)(qi)以擴(kuo)(kuo)大(da)量(liang)(liang)(liang)(liang)程(cheng)，測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)大(da) 的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li) 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容 器(qi)(qi)(qi)(qi)(qi) 時本電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋為四端測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)具有(you)引線補償裝(zhuang)置，使(shi)測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)精(jing)度(du)提高(gao)，消除接線電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻引起的(de)(de)(de)(de)附加(jia)誤差。本電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋還(huan)可(ke)測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗器(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感量(liang)(liang)(liang)(liang)及(ji)(ji)Q值(zhi)。量(liang)(liang)(liang)(liang)程(cheng)擴(kuo)(kuo)展(zhan)器(qi)(qi)(qi)(qi)(qi)（供選購(gou)）能(neng)使(shi)主橋體的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容比(bi)從1000：1擴(kuo)(kuo)大(da)到106：1。

　　技術指標

　　電容(rong)測量范(fan)圍:0.1Cn~1000Cn（7位有效數字(zi)）外接量程擴(kuo)展電容(rong)量至少測到1100uF

　　電容的測(ce)量準確度：±1×10-5

　　電橋(qiao)tgδ范(fan)圍：-110%到+110%

　　tgδ測量準確度不(bu)大于0.2%rdg±1×10-5

　　tgδ測量z小分(fen)辨率(lv)1×10-6（連接電腦可達1×10-7）

　　試驗電壓：0～1000kV，精度1%（4位有(you)效數字）

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

電橋電容率介電常數測試儀在交(jiao)流電(dian)(dian)(dian)(dian)(dian)壓作用下，電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)(jie)質要消(xiao)耗部分電(dian)(dian)(dian)(dian)(dian)能，這(zhe)部分電(dian)(dian)(dian)(dian)(dian)能將轉(zhuan)變為(wei)熱能產生損(sun)(sun)(sun)耗。這(zhe)種(zhong)能量(liang)(liang)(liang)(liang)(liang)損(sun)(sun)(sun)耗叫(jiao)做(zuo)電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)(jie)質的(de)(de)損(sun)(sun)(sun)耗。當電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)(jie)質上施加交(jiao)流電(dian)(dian)(dian)(dian)(dian)壓時，電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)(jie)質中的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓和電(dian)(dian)(dian)(dian)(dian)流間成(cheng)在相角(jiao)(jiao)(jiao)差(cha)(cha)ψ，ψ的(de)(de)余角(jiao)(jiao)(jiao)δ稱為(wei)介(jie)(jie)(jie)質損(sun)(sun)(sun)耗角(jiao)(jiao)(jiao)，δ的(de)(de)正切tgδ稱為(wei)介(jie)(jie)(jie)質損(sun)(sun)(sun)耗角(jiao)(jiao)(jiao)正切。tgδ值(zhi)是用來衡量(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)(jie)質損(sun)(sun)(sun)耗的(de)(de)參(can)數。儀器(qi)(qi)測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)線路(lu)(lu)包括一(yi)標準(zhun)回路(lu)(lu)（Cn）和一(yi)被(bei)試回路(lu)(lu)(Cx)，如圖(tu)2—1所(suo)示。標準(zhun)回路(lu)(lu)由內(nei)(nei)置(zhi)高穩定度標準(zhun)電(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)與測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)線路(lu)(lu)組成(cheng)，被(bei)試回路(lu)(lu)由被(bei)試品(pin)(pin)和測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)線路(lu)(lu)組成(cheng)。測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)線路(lu)(lu)由取樣電(dian)(dian)(dian)(dian)(dian)阻與前置(zhi)放(fang)大器(qi)(qi)和A/D轉(zhuan)換器(qi)(qi)組成(cheng)。通(tong)過測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)分別測(ce)(ce)得(de)(de)標準(zhun)回路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流與被(bei)試回路(lu)(lu)電(dian)(dian)(dian)(dian)(dian)流幅值(zhi)及其相位差(cha)(cha)，再由數字信號處理器(qi)(qi)運用數字化實時采集方(fang)法，通(tong)過矢量(liang)(liang)(liang)(liang)(liang)運算得(de)(de)出試品(pin)(pin)的(de)(de)電(dian)(dian)(dian)(dian)(dian)容(rong)值(zhi)和介(jie)(jie)(jie)質損(sun)(sun)(sun)耗正切值(zhi)。儀器(qi)(qi)內(nei)(nei)部已經采用了抗干(gan)擾措施，保證在外(wai)電(dian)(dian)(dian)(dian)(dian)場(chang)干(gan)擾下準(zhun)確測(ce)(ce)量(liang)(liang)(liang)(liang)(liang)。