大型地網接地電阻儀

大型地網接地電阻儀

大型地網(wang)接地電阻測(ce)(ce)試儀，主要(yao)用途(tu)是測(ce)(ce)試大型地網(wang)的接地電阻。可測(ce)(ce)變電站地網(wang)、水火電廠、微波站、避雷針接地電阻。

基本信息

• 中文名稱

  大(da)型(xing)地網接(jie)地電阻測試儀

• 外文名稱

  RXLarge Grounding Resistance Tester

• 主要用途

  測試(shi)大型(xing)地網(wang)的接地電阻(zu)

• 使用環境溫度

  -20℃~+50℃

• 電源電壓

  AC220V或380V

組成部件

變頻大電流多功能地網接地特性測量系統由大功率變頻信號源、耦合變壓器、高精度多功能選頻萬用表及其它附件等組成。

主要用途

大(da)型地(di)(di)(di)網接(jie)地(di)(di)(di)阻抗(kang)測(ce)試(shi)儀是主要用于jing確(que)測(ce)量大(da)型接(jie)地(di)(di)(di)網接(jie)地(di)(di)(di)阻抗(kang)、接(jie)地(di)(di)(di)電(dian)(dian)(dian)(dian)阻、接(jie)地(di)(di)(di)電(dian)(dian)(dian)(dian)抗(kang)、場區地(di)(di)(di)表(biao)電(dian)(dian)(dian)(dian)位梯度、接(jie)觸(chu)電(dian)(dian)(dian)(dian)位差、接(jie)觸(chu)電(dian)(dian)(dian)(dian)壓、跨步電(dian)(dian)(dian)(dian)位差、跨步電(dian)(dian)(dian)(dian)壓、轉移電(dian)(dian)(dian)(dian)位、接(jie)地(di)(di)(di)引(yin)下線導通電(dian)(dian)(dian)(dian)阻、土壤電(dian)(dian)(dian)(dian)阻率等接(jie)地(di)(di)(di)特性參數的軟硬件系統(tong)(tong)。采(cai)用逐點(dian)變(bian)頻，抗(kang)干擾(rao)*，能在強(qiang)干擾(rao)環境(jing)下準確(que)測(ce)得(de)工頻50Hz下的數據。系統(tong)(tong)輸出功(gong)率大(da)(2-20KW)，電(dian)(dian)(dian)(dian)壓高(gao)(0-1000V)，輸出電(dian)(dian)(dian)(dian)流大(da)(0-50A)，不(bu)會引(yin)起測(ce)試(shi)時接(jie)地(di)(di)(di)裝置的電(dian)(dian)(dian)(dian)位過高(gao)，同時它還(huan)具(ju)有(you)*的抗(kang)干擾(rao)能力，故可以在不(bu)停(ting)電(dian)(dian)(dian)(dian)的情況下進行測(ce)量。

現狀

目前(qian)在電(dian)(dian)(dian)(dian)力系統中(zhong)，大(da)型(xing)地網(wang)的接地電(dian)(dian)(dian)(dian)阻的測(ce)(ce)試(shi)(shi)(shi)(shi)(shi)(shi)目前(qian)主要采用(yong)(yong)工頻(pin)大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)三(san)極法(fa)測(ce)(ce)量(liang)。為(wei)了(le)(le)(le)防止電(dian)(dian)(dian)(dian)網(wang)運行時(shi)產生的工頻(pin)干擾，提高(gao)測(ce)(ce)量(liang)結果的準確(que)性(xing)，絕緣預防性(xing)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)規(gui)程(cheng)規(gui)定:工頻(pin)大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)法(fa)的試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)電(dian)(dian)(dian)(dian)流(liu)(liu)不得小于30安培(pei)。由此，就(jiu)出現了(le)(le)(le)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)設備(bei)笨重，試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)過(guo)(guo)程(cheng)復雜，試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)人(ren)(ren)員工作(zuo)強(qiang)度大(da)，試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)時(shi)間長(chang)等(deng)諸多問題(ti)。 大(da)型(xing)地網(wang)接地電(dian)(dian)(dian)(dian)阻測(ce)(ce)試(shi)(shi)(shi)(shi)(shi)(shi)儀，可測(ce)(ce)變(bian)電(dian)(dian)(dian)(dian)站(zhan)地網(wang)(4Ω)、水火(huo)電(dian)(dian)(dian)(dian)廠、微(wei)波站(zhan)(10Ω)、避雷針(zhen)(10Ω)多用(yong)(yong)機型(xing)，采用(yong)(yong)了(le)(le)(le)新型(xing)變(bian)頻(pin)交流(liu)(liu)電(dian)(dian)(dian)(dian)源(yuan)，并采用(yong)(yong)了(le)(le)(le)微(wei)機處理(li)控(kong)制和信號處理(li)等(deng)措(cuo)施，很好的解決了(le)(le)(le)測(ce)(ce)試(shi)(shi)(shi)(shi)(shi)(shi)過(guo)(guo)程(cheng)中(zhong)的抗干擾問題(ti)，簡化了(le)(le)(le)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)操作(zuo)過(guo)(guo)程(cheng)，提高(gao)了(le)(le)(le)測(ce)(ce)試(shi)(shi)(shi)(shi)(shi)(shi)結果的精度和準確(que)性(xing)，大(da)大(da)降低了(le)(le)(le)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)人(ren)(ren)員的勞動強(qiang)度和試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)成本。

產品別稱(cheng)

也(ye)稱(cheng)大(da)(da)地(di)(di)(di)網(wang)接(jie)(jie)地(di)(di)(di)電阻(zu)測(ce)(ce)試(shi)儀(yi)，變頻大(da)(da)電流接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)儀(yi)，大(da)(da)型接(jie)(jie)地(di)(di)(di)網(wang)接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)系統(tong)(tong)、接(jie)(jie)地(di)(di)(di)裝置特(te)性參數測(ce)(ce)試(shi)系統(tong)(tong)、大(da)(da)地(di)(di)(di)網(wang)接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)儀(yi)，接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)儀(yi)，變頻抗(kang)(kang)(kang)干擾接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)儀(yi)、變電站接(jie)(jie)地(di)(di)(di)網(wang)接(jie)(jie)地(di)(di)(di)特(te)性參數測(ce)(ce)試(shi)儀(yi)、變頻大(da)(da)電流多功能接(jie)(jie)地(di)(di)(di)阻(zu)抗(kang)(kang)(kang)測(ce)(ce)試(shi)儀(yi)等

電壓輸出

1、DF9000大型地網變頻大電流接地特性測量系統:系統輸出功率大(2-20KW)，電壓高(0-1000V)，輸出電流大(0-50A)。jing確測(ce)(ce)量(liang)接(jie)地(di)(di)(di)阻(zu)抗，接(jie)地(di)(di)(di)電(dian)抗，接(jie)地(di)(di)(di)電(dian)阻(zu)，接(jie)觸電(dian)壓(ya)(ya)，跨步電(dian)位(wei)差，場區地(di)(di)(di)表電(dian)位(wei)梯度，接(jie)觸電(dian)壓(ya)(ya)，接(jie)觸電(dian)位(wei)差，跨步電(dian)壓(ya)(ya)，轉移電(dian)位(wei)，導(dao)通電(dian)阻(zu)，土壤(rang)電(dian)阻(zu)率等參(can)數(shu)，可全面(mian)測(ce)(ce)量(liang)大型地(di)(di)(di)網的(de)各項特性參(can)數(shu)，*新版DL/T475-2006《接(jie)地(di)(di)(di)裝置特性參(can)數(shu)測(ce)(ce)量(liang)導(dao)則》的(de)要求。

2、DF910K大型地網變頻大電流接地阻抗測量系統:系統輸出功率大(5-20KW)，輸出電壓(0-1000V)，輸出電流(0-50A)。jing確測量接地(di)阻(zu)抗，接地(di)電(dian)(dian)阻(zu)，接觸電(dian)(dian)位(wei)差，接地(di)電(dian)(dian)抗，導通電(dian)(dian)阻(zu)，土壤(rang)電(dian)(dian)阻(zu)率等(deng)參數。

3、DF902K變頻抗干擾接地阻抗測量儀:系統輸出功率2kW，輸出電壓(0-200-400V).測試輸出電流(0-10A)。jing確(que)測量(liang)接地阻抗，接地電阻，接地電抗，導通(tong)電阻，土壤電阻率等參(can)數。可滿(man)常規接地網的測量(liang)。

產品功能

1.jing確測量(liang)大型接地(di)網接地(di)阻抗、接地(di)電阻、接地(di)電抗;

2.jing確測量(liang)大型接地網場區地表電位梯度;

3.jing確測量大(da)型接(jie)(jie)地網接(jie)(jie)觸電(dian)(dian)位差、接(jie)(jie)觸電(dian)(dian)壓、跨(kua)步電(dian)(dian)位差、跨(kua)步電(dian)(dian)壓;

4.測量土壤電阻率

5.jing確測量大型接地(di)網轉移電位;

6.測量(liang)接地(di)引下線導通電(dian)阻(zu);

結構和(he)原理

本儀器主要由(you)提供測試(shi)電(dian)(dian)流(liu)的(de)異頻電(dian)(dian)源、電(dian)(dian)流(liu)和(he)電(dian)(dian)壓測量電(dian)(dian)路(lu)以及(ji)微電(dian)(dian)腦(nao)測控系(xi)統組成。儀器通過測量接(jie)地裝置的(de)電(dian)(dian)位升高(gao)與流(liu)入接(jie)地裝置的(de)電(dian)(dian)流(liu)之比來測量接(jie)地阻抗。

異(yi)頻(pin)恒流(liu)電(dian)(dian)(dian)(dian)源可輸(shu)(shu)(shu)(shu)出(chu)頻(pin)率為(wei)45Hz或(huo)55Hz的(de)(de)(de)正弦波(bo)(bo)測試(shi)電(dian)(dian)(dian)(dian)流(liu)，輸(shu)(shu)(shu)(shu)出(chu)頻(pin)率受微電(dian)(dian)(dian)(dian)腦(nao)系統控制(zhi)。其輸(shu)(shu)(shu)(shu)出(chu)經過(guo)(guo)(guo)(guo)隔離(li)后(hou)通過(guo)(guo)(guo)(guo)儀器(qi)(qi)面板上(shang)的(de)(de)(de)C1、C2兩個端子輸(shu)(shu)(shu)(shu)出(chu)。電(dian)(dian)(dian)(dian)壓(ya)(ya)放大器(qi)(qi)為(wei)一個高輸(shu)(shu)(shu)(shu)入阻(zu)(zu)抗(kang)放大器(qi)(qi)，它將(jiang)(jiang)P1、P2兩端的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)放大后(hou)送(song)給濾波(bo)(bo)器(qi)(qi)。電(dian)(dian)(dian)(dian)流(liu)放大器(qi)(qi)將(jiang)(jiang)從電(dian)(dian)(dian)(dian)流(liu)互感(gan)器(qi)(qi)取(qu)得(de)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)信(xin)號(hao)進(jin)行(xing)(xing)放大后(hou)送(song)給濾波(bo)(bo)器(qi)(qi)。濾波(bo)(bo)器(qi)(qi)用(yong)于(yu)濾除干(gan)擾(rao)信(xin)號(hao)，只允許45Hz和(he)(he)(he)55Hz信(xin)號(hao)通過(guo)(guo)(guo)(guo)。A/D轉(zhuan)換(huan)(huan)器(qi)(qi)用(yong)于(yu)將(jiang)(jiang)電(dian)(dian)(dian)(dian)壓(ya)(ya)和(he)(he)(he)電(dian)(dian)(dian)(dian)流(liu)信(xin)號(hao)轉(zhuan)換(huan)(huan)為(wei)數字(zi)信(xin)號(hao)以便微電(dian)(dian)(dian)(dian)腦(nao)系統進(jin)行(xing)(xing)分(fen)析(xi)處(chu)理。 用(yong)戶(hu)啟(qi)動(dong)接(jie)地阻(zu)(zu)抗(kang)測量(liang)(liang)(liang)后(hou)，儀器(qi)(qi)首先開啟(qi)異(yi)頻(pin)電(dian)(dian)(dian)(dian)源使之輸(shu)(shu)(shu)(shu)出(chu)頻(pin)率為(wei)45Hz的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)，待電(dian)(dian)(dian)(dian)流(liu)穩(wen)定之后(hou)，微電(dian)(dian)(dian)(dian)腦(nao)系統通過(guo)(guo)(guo)(guo)A/D轉(zhuan)換(huan)(huan)器(qi)(qi)取(qu)得(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)和(he)(he)(he)電(dian)(dian)(dian)(dian)流(liu)波(bo)(bo)形(xing)數據，進(jin)行(xing)(xing)數字(zi)濾波(bo)(bo)后(hou)計(ji)算出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)V45和(he)(he)(he)電(dian)(dian)(dian)(dian)流(liu)I45及其相位(wei)差(cha),再進(jin)一步(bu)計(ji)算出(chu)阻(zu)(zu)抗(kang)Z45、電(dian)(dian)(dian)(dian)阻(zu)(zu)分(fen)量(liang)(liang)(liang)R45和(he)(he)(he)電(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)(liang)(liang)X45。然后(hou)，切換(huan)(huan)異(yi)頻(pin)電(dian)(dian)(dian)(dian)源的(de)(de)(de)輸(shu)(shu)(shu)(shu)出(chu)頻(pin)率為(wei)55Hz，經過(guo)(guo)(guo)(guo)同樣的(de)(de)(de)步(bu)驟后(hou)可計(ji)算出(chu)阻(zu)(zu)抗(kang)Z55、電(dian)(dian)(dian)(dian)阻(zu)(zu)分(fen)量(liang)(liang)(liang)R55和(he)(he)(he)電(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)(liang)(liang)X55。取(qu)Z45 和(he)(he)(he)Z55的(de)(de)(de)平均值作為(wei)工頻(pin)接(jie)地阻(zu)(zu)抗(kang)Z50。后(hou)，關閉(bi)異(yi)頻(pin)電(dian)(dian)(dian)(dian)源，通過(guo)(guo)(guo)(guo)液晶屏顯示測量(liang)(liang)(liang)結果。因此阻(zu)(zu)抗(kang)測量(liang)(liang)(liang)時，儀器(qi)(qi)測量(liang)(liang)(liang)的(de)(de)(de)是兩電(dian)(dian)(dian)(dian)壓(ya)(ya)輸(shu)(shu)(shu)(shu)入端P1、P2之間的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)與(yu)電(dian)(dian)(dian)(dian)源輸(shu)(shu)(shu)(shu)出(chu)電(dian)(dian)(dian)(dian)流(liu)之比

系(xi)統參(can)數

電源電壓:AC220V或(huo)380V，50Hz

輸出功率(lv): 10KW(2KW~20KW可選，可定制)

輸出電壓:0~600V或 1000V(可定(ding)制)

測(ce)試輸出電流:0~50A

頻率調節范圍(wei):45~65Hz

步進頻率:1Hz

抗干擾(rao)能(neng)力(li):通頻(pin)帶±0.3Hz，衰減>80dB/Hz

測量范圍(wei):0.001~1000Ω

分辨率(lv):1mΩ

測量精度:1.0級

使用(yong)環(huan)境溫度:-20℃~+50℃

測試操作步(bu)驟(zou)

1. 首(shou)先檢查用(yong)于試(shi)驗的電流線(xian)、電壓線(xian)和地網線(xian)是否(fou)有斷路現象(可(ke)以用(yong)萬(wan)用(yong)表測(ce)量)，地樁上的鐵銹是否(fou)清除(chu)干凈，其埋進深度是否(fou)合適(>0.5米)，同時檢查測(ce)試(shi)線(xian)與(yu)地樁的連接是否(fou)導(dao)通，如未導(dao)通，請(qing)處理(li)后重(zhong)新連接。

2. 電(dian)流(liu)測(ce)試(shi)線與(yu)電(dian)壓測(ce)試(shi)線的(de)長度比為1:0.618，電(dian)流(liu)測(ce)試(shi)線的(de)長度應是地網對(dui)角線的(de)3-5倍(bei)。

3. 電(dian)流(liu)測試線和電(dian)壓測試線按規定的長度將一端(duan)與儀(yi)器相(xiang)接(jie)后平行放出(chu)。另一端(duan)分別接(jie)在兩(liang)支地樁上(shang)(如圖(tu)2所示)。

4. 將已放好(hao)的(de)測試線(xian)檢查一(yi)遍，將萬用表一(yi)端接(jie)電(dian)流線(xian)或電(dian)壓線(xian)，另(ling)一(yi)端接(jie)地網(wang)線(xian)如(ru)無阻(zu)值顯(xian)示即為斷路，確認完好(hao)再進行測試。

5. 檢查連線無誤(wu)后，給(gei)儀器(qi)接(jie)上AC220V/50HZ電(dian)源(yuan)，對(dui)儀器(qi)進行(xing)通(tong)電(dian)。

6. 按測量鍵，開始測量。

7. 儀器顯示測試結(jie)束(shu)后(hou)，記(ji)錄測試數據(ju)。

8. 關(guan)掉儀器電(dian)源后，拆除連線，測試過程結束。

測(ce)試菜單

1. 測(ce)量方式: 儀(yi)器可(ke)以(yi)選擇五種測(ce)量方式,即(ji)"地(di)(di)網", "電(dian)(dian)(dian)流(liu)樁", "電(dian)(dian)(dian)壓(ya)(ya)樁","接(jie)(jie)地(di)(di)","電(dian)(dian)(dian)壓(ya)(ya)".前三種的(de)(de)(de)作用(yong)(yong)分別是(shi)測(ce)量地(di)(di)網阻(zu)抗(kang)(kang),電(dian)(dian)(dian)流(liu)樁阻(zu)抗(kang)(kang),電(dian)(dian)(dian)壓(ya)(ya)樁阻(zu)抗(kang)(kang).一般情況下做實驗(yan)的(de)(de)(de)時(shi)(shi)候(hou)應(ying)選擇"地(di)(di)網"來測(ce)量大(da)地(di)(di)網的(de)(de)(de)阻(zu)抗(kang)(kang).而當用(yong)(yong)戶要(yao)求(qiu)測(ce)量電(dian)(dian)(dian)流(liu)樁或電(dian)(dian)(dian)壓(ya)(ya)樁阻(zu)抗(kang)(kang)的(de)(de)(de)時(shi)(shi)候(hou)可(ke)以(yi)選擇后直接(jie)(jie)測(ce)量. "接(jie)(jie)地(di)(di)"的(de)(de)(de)作用(yong)(yong)是(shi)測(ce)量接(jie)(jie)地(di)(di)電(dian)(dian)(dian)阻(zu)和土壤(rang)電(dian)(dian)(dian)阻(zu)率(lv)。默(mo)認(ren)線長20米。也可(ke)以(yi)修改線長。"電(dian)(dian)(dian)壓(ya)(ya)"的(de)(de)(de)作用(yong)(yong)是(shi)測(ce)量跨(kua)步(bu)電(dian)(dian)(dian)壓(ya)(ya)，接(jie)(jie)觸電(dian)(dian)(dian)壓(ya)(ya)等參數。(注(zhu)意，"電(dian)(dian)(dian)壓(ya)(ya)"需要(yao)配相應(ying)的(de)(de)(de)電(dian)(dian)(dian)極(ji))。

2. 頻率(lv)選(xuan)擇: 儀器可以選(xuan)擇兩種測(ce)(ce)量(liang)頻率(lv),即"變(bian)頻"和(he)(he) "定頻".在(zai)(zai)現場做實(shi)驗(yan)時(shi)候,一定要選(xuan)擇"變(bian)頻"來做實(shi)驗(yan),這樣(yang)測(ce)(ce)量(liang)能夠消除(chu)現場的(de)(de)電(dian)磁場干擾. "定頻"方式只是在(zai)(zai)實(shi)驗(yan)室里面做實(shi)驗(yan)的(de)(de)時(shi)候才能使用. "變(bian)頻"采(cai)用的(de)(de)是45Hz和(he)(he)55Hz雙變(bian)頻來測(ce)(ce)量(liang). 而(er)"定頻"采(cai)用的(de)(de)是嚴(yan)格(ge)50Hz來測(ce)(ce)量(liang)。

3. 電(dian)流(liu)(liu)選(xuan)(xuan)擇(ze): 儀器提供5種測量電(dian)流(liu)(liu). 即(ji)(ji)"1A","2A","3A","4A","5A".根(gen)據(ju)電(dian)流(liu)(liu)樁阻抗的大小來選(xuan)(xuan)擇(ze)測試電(dian)流(liu)(liu).一般(ban)情況(kuang)下,使用5A電(dian)流(liu)(liu)即(ji)(ji)可。

4. 自動(dong)(dong)打(da)印: 當光標在電(dian)流上時(shi)候，按一下"確認(ren)"鍵,在屏幕左下角會(hui)出(chu)現或(huo)消失(shi)打(da)印機小符號(hao),代表選(xuan)擇(ze)或(huo)取(qu)消自動(dong)(dong)打(da)印功(gong)能.當選(xuan)擇(ze)自動(dong)(dong)打(da)印時(shi)候,測試完畢,儀器自動(dong)(dong)打(da)印結果(guo).當取(qu)消自動(dong)(dong)打(da)印時(shi)候,如果(guo)想打(da)印結果(guo),需要手動(dong)(dong)打(da)印結果(guo)。

5. 手動打印: 儀器測試完畢,出現圖7所示(shi)的界(jie)面(mian).按(an) 鍵(jian)(jian)可以在"print","quit"之(zhi)間選擇.如(ru)(ru)果選擇"print",按(an)一下"確認"鍵(jian)(jian),就會(hui)打印結果.如(ru)(ru)果選擇"quit", 按(an)一下"確認"鍵(jian)(jian),就會(hui)返回初始界(jie)面(mian)如(ru)(ru)圖3所示(shi)。

儀器自(zi)診(zhen)

1. "請開機(ji)重啟"時候(hou) ，可能(neng)是儀器內部電源(yuan)保護，關機(ji)重啟。

2. "電源模塊錯誤，請聯(lian)系(xi)廠(chang)(chang)家(jia)"時(shi)候，把光(guang)標移動到"地(di)網"上，按十(shi)下"確認"鍵(jian)，聽(ting)到儀(yi)器(qi)喇叭響一(yi)聲，并且(qie)在屏幕的左下角出現一(yi)個反色的打印機符號。然后(hou)關機重啟。如果繼(ji)續無(wu)法測試(shi)，請聯(lian)系(xi)廠(chang)(chang)家(jia)。

3. 測試電(dian)流為0.0A時候，可能"電(dian)流線(xian)"連線(xian)與(yu)"電(dian)流極"地樁(zhuang)(zhuang)接觸不(bu)良或地樁(zhuang)(zhuang)太少(shao)(shao)，需增加地樁(zhuang)(zhuang)，減少(shao)(shao)回路電(dian)阻。地樁(zhuang)(zhuang)深度不(bu)少(shao)(shao)于0.5m。電(dian)流樁(zhuang)(zhuang)電(dian)阻應該(gai)小于200Ω。

4. 若儀器顯(xian)示的測量值(zhi)極低(<;0.01Ω)則可能是電壓線未連接上(shang)。

5. 儀器(qi)檢(jian)測時候，必(bi)須在C1輸出端串接20歐以上的電(dian)(dian)阻，用來模擬現場電(dian)(dian)流樁電(dian)(dian)阻，否(fou)則有可能造成測量數(shu)據誤差偏大。