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計時與計數器

怎樣正確使用接地搖表?

發布日期:2022-04-17 點擊率:64

  測量前,首先將兩根探測針分別插入地中接地極 E ,電位探測針 P 和電流探測針 C 成一直線并相距 20 米, P 插于 E 和 C 之間,然后用專用導線分別將 E 、 P 、 C 接到儀表的相應接線柱上。

  測量時,先把儀表放到水平位置檢查檢流計的指針是否指在中心線上,否則可借助零位調整器,把指針調整到中心線,然后將儀表的“信率標度”置于最大倍數,慢慢轉動發電機的搖把,同時旋動“測量標度盤”使檢流計指針平衡,當指針接近中心線時,加快發電機搖把的轉速,達到每分鐘 120 轉以上,再調整“測量標度盤”使指針于中心線上,用“測量標度盤”的讀數乘以“倍率標度”的倍數,即為所測量的電阻值。

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