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</p><p>產(chǎn)品特征：</p><p>1．雙鉗法/地樁法雙重測量方式：</p><p>適合任意接地場所，多點或單點接地，都可正常測試；</p><p>2．抗干擾能力強：</p><p>自產(chǎn)生高頻電流，從而過濾市電中50Hz、100Hz等諧波干擾電流，即使在500KV變電站環(huán)境下，也能測量；</p><p>3．測量范圍廣、分辨率高：</p><p>量程從0.01Ω～200Ω，分辨率0.01Ω，對0.7Ω以下接地電阻，也能準確測量；</p><p>4．大鉗口設計：</p><p>鉗口直徑50mm（標準配置），滿足用扁鐵/鋼作接地引線的情況，特殊鉗口尺寸可按客戶要求定制；</p><p>5．大容量數(shù)據(jù)存儲：</p><p>可儲存200組測量數(shù)據(jù)；</p><p>6．操作簡單，單人作業(yè)：</p><p>全中文操作界面、體積小、重量輕，防爆便攜箱，野外測量攜帶方便。</p><p> </p><p>產(chǎn)品參數(shù)：</p><p>1．接地電阻測量范圍：</p><p>雙鉗法：0.01Ω～200Ω</p><p>地樁法：0.01Ω～200Ω</p><p>2．誤差:</p><p>雙鉗法：±3%±2個字</p><p>地樁法：±2%±2個字</p><p>3．***小分辨率：0.01Ω</p><p>4．鉗口尺寸：Φ50mm</p><p>5．存儲容量：200組數(shù)據(jù)</p><p>6．工作溫度：0oC ～ + 50°C</p><p>7．電源：8節(jié)5號鎳氫充電電池或普通AA電池</p><p>8．重量：0.8KG(含電池)</p><p>9．尺寸：265mm×130mm×65mm</p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">測量原理及使用方法</span></strong></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈠、雙鉗法</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">1、測量原理</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">此方法的優(yōu)點在于：一是操作簡單?？梢栽诓粩嚅_待測設備電源，在其正常工作時進行測試，不必插入測量探頭，也不必將被測電極分開，只需要雙鉗夾著接地導體就可以測出其接地電阻。二是精度高。其精度可以達到0.01Ω。三是抗干擾能力強?？梢詾V出各種工頻諧波。四是可以作為打地樁方式的補充。在很多條件下（如房屋密集或鋪滿水泥的地區(qū)），很難甚至不可能采用打樁的方式對接地電阻的測量，使用雙鉗口測試原理，可以不用打接地樁進行測量。該測量原理的WEI一的不足是：不能夠直接對單點接地系統(tǒng)的測量。在單點接地系統(tǒng)中應慎用鉗形地阻表。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">其測量原理簡述如下：本儀表配有兩個鉗口：電壓鉗和電流鉗。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">如圖2所示，電壓鉗在被測回路中激勵出一個感應電勢E，并在被測回路產(chǎn)生電流I，儀表通過電流鉗可以測得I值。通過對E、I的測量，由歐姆定律：R=E/I，即可求得R的值。</span></span></p><p style="text-align:center"><span style="font-size:16px"><img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb4de6831af7a1ef591bd5f0d7294bc4ed7a032c44f0eb9f397.png" style="height:148px; width:141px" /> </span></p><p style="margin-left:17.95pt; text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖2 測量原理</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">2、多極并聯(lián)接地電阻的測量</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">對多點接地系統(tǒng)（例如輸電系統(tǒng)桿塔接地、通信電纜接地系統(tǒng)、某些建筑物等），它們通過架空地線（通信電纜的屏蔽層）連接，組成了接地系統(tǒng)。如圖3所示：</span></span></p><p style="text-align:center"><span style="font-size:16px"><img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb45335730fe093aa95b853af58a73c75abcea41485db3b3494.png" style="height:243px; width:516px" /> </span></p><p style="text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖3 多點接地系統(tǒng)地阻的測量</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">當用鉗表將兩個鉗口鉗入被測接地線上，兩個鉗口的間距為30cm左右，發(fā)射鉗夾插入“發(fā)射”航插孔，接收鉗夾插入“接收”航插孔，兩航插孔不可互換，（如上圖測量時），其等效電路見下圖。</span></span></p><p style="margin-left:6pt; text-align:center"><span style="font-size:16px"><img alt="" src="https://img49.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb423495193c73985245118d7288a08c3fbe1e62fad01e86b37.png" style="height:148px; width:141px" /> </span></p><p style="text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖4 等效電路</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">則R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體"> =Rx+ R</span><sub><span style="font-family:宋體">0</span></sub></span></p><p><span style="font-size:16px"><span style="font-family:宋體">其中：</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體">：儀表測量出的值</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">Rx：待測接地電阻</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">：所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">雖然，從嚴格的接地理論來說，由于有所謂的“互電阻”的存在，R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">并不是通常的電工學意義上的并聯(lián)值（它會比電工學意義上的并聯(lián)值稍大），但是，由于每一個桿塔的接地半球比起桿塔之間的距離要小得多，而且畢竟接地點數(shù)量很大，R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">要比R</span><sub><span style="font-family:宋體">1</span></sub><span style="font-family:宋體">小得多。因此，可以從工程角度有理由地假設R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">=0。這樣，我們所測的電阻就應該是R</span><sub><span style="font-family:宋體">X</span></sub><span style="font-family:宋體">了，即R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體">≈Rx。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">多次不同環(huán)境、不同場合下與傳統(tǒng)方法進行對比試驗，證明上述假設是*合理的。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><span style="font-family:宋體">非接觸測量法（即雙鉗法）是一種*的測量技術，具有諸多優(yōu)點。不過，測試儀測得的電阻是包括被測接地電阻在內(nèi)的整個回路的電阻。使用中必須牢記這一點，以利對測量結果的分析。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">注意：發(fā)射鉗夾，接收鉗夾不可互換。</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">3、雙鉗法測獨立接地體的方法</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">a、雙鉗法在測試過程中，一定要有一個有效的閉合回路。解決的辦法是找一個輔助接電極，將被測接地體與接地良好的輔助地（如自來水管等）用連接線連在一起，將二個鉗口鉗入連接線上，（圖5所示）：二者間距30cm左右，此時按“雙鉗”鍵，進行雙鉗法測量界面，再按“測試”鍵直接顯示測量結果。測試獨立接地體接地電阻時可根據(jù)不同的情況采用不同的測試方法。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">b、當機房處于低樓層時（一、二層）可采用地樁測試方法，直接測出接地電阻。</span></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><span style="font-family:宋體">機房處于較高樓層時，（二層以上），可采用“獨立接地體”測試方法此種方法是基于將自來水管網(wǎng)的接地電阻理論上認為是零歐姆，但實際上是有電阻值的，此時測試分為二步：*步，按“獨立接地體”測試方法測出R</span><sub><span style="font-family:宋體">A</span></sub><span style="font-family:宋體">；第二步，單獨在一樓將自來水管的接地電阻按“地樁”測試方法測出R</span><sub><span style="font-family:宋體">B</span></sub><span style="font-family:宋體">（此時自來水管看作獨立接地體），（R</span><sub><span style="font-family:宋體">A</span></sub><span style="font-family:宋體">－R</span><sub><span style="font-family:宋體">B</span></sub><span style="font-family:宋體">）即為機房接地裝置的實際接地電阻?！?/span></span></li></ul><p style="margin-left:27pt; text-align:center"><span style="font-size:16px"><img alt="" src="https://img48.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb4373f7e9cef1cba05f3b8507d2b9543452e969ad9a8cf7572.png" style="height:153px; width:372px" /><br /><span style="font-family:宋體">圖5 獨立接地體地阻測量</span></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><span style="font-family:宋體">雙鉗法測電阻時，如果測量值顯示溢出，則說明被測電阻已超過本儀表的測量范圍或說明鉗口沒有鉗繞任何金屬導體或被測接地線。</span></span></li></ul><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈡、地樁法</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">采用圖6的連接方法。此時按“地樁”鍵，進入地樁法測試界面。再按“測試”鍵可更精確地測量出被測接地體的接地電阻值。</span></span></p><p style="margin-left:27pt; text-align:center"><span style="font-size:16px"> <img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb45cf720bb3fcfed81a4f4b55e0d7f4080e9b31bd3c832a77f.png" style="height:274px; width:383px" /></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈢、存儲</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">每次測量后，可存貯測量結果。按左移鍵或右移鍵，將光標停在“存儲”上，按“確認”鍵進入存儲功能。輸入要存儲或查看的目號，然后按“確認”即可存儲，例如要將測量數(shù)據(jù)存儲到第7組內(nèi)，則將目號調(diào)整至007。再按“確認”鍵，進行確認，即可完成存儲。如該目號已存有數(shù)據(jù)，則原數(shù)據(jù)被覆蓋。繼續(xù)測試，按“確認”鍵，返回測試狀態(tài)。本機可存儲200組數(shù)據(jù)。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈣、查看/刪除</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">在雙鉗法和地樁法測試界面，將光標移到“返回”上，再按“確認”鍵，即右進入主菜單，再按“▲”“▼”鍵，選擇 “查看歷史數(shù)據(jù)”或“刪除歷史數(shù)據(jù)”。再按“確認”鍵，進入相應的功能。按“</span><img src="file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml\wps2A99.tmp.png" style="height:16px; width:13px" /><span style="font-family:宋體">” “</span><img src="file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml\wps2A9A.tmp.png" style="height:16px; width:13px" /><span style="font-family:宋體">”左右調(diào)整，按“▲” 、“▼”調(diào)整數(shù)字，按“確認”鍵進行確認，即可查閱存儲數(shù)值或刪除存儲的數(shù)值。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈤、保持</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">在雙鉗法，地樁法測試過程中，由于環(huán)境影響及外界干擾等因素，可能會出現(xiàn)數(shù)值不穩(wěn)定的現(xiàn)象。在雙鉗法、地樁法測試界面，當光標停留在“保持”上時可以按“確認”鍵對測量數(shù)值進行鎖定，便于測量者進行記錄和讀取數(shù)值。此時屏幕上“保持”變?yōu)?ldquo;解除”，再按一下“確認”即可解除鎖定功能。</span></span></p><p> </p><p><span style="font-size:16px"><strong><span style="font-family:宋體">七、注意事項</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">1、鉗口和主機為配套使用，出廠前已按要求配好。為避免測量誤差，本主機所配鉗口不得用于其他主機上。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">2、任何時候都要保護鉗口鐵芯接觸面的清潔，被污染的鉗口會降低儀表的測量準確度。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">3、測試時，要保持鉗口閉合良好，不可出現(xiàn)卡殼現(xiàn)象。</span></span></p> <div id="ag0icou4w4" class="pagetb"> <p> 上一條：<a href="/Products-27529887.html">NRI5600雙鉗多功能接地電阻測試儀</a></p> <p> 下一條：<a href="/Products-27529891.html">HT5600雙鉗多功能接地電阻測試儀</a></p> 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