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電流表

合理選擇電流表

發布日期:2022-10-09 點擊率:53

  根據額定電流選大于1/3或1/2的電流表,主要是考慮負載冷啟動時的電流會偏大及間中略有過載的情況下能正常顯示。如何合理選擇一款電流表,根據被測量準確度要求,合理選擇電流表的準確度,電流表的測量前檢查,與被測電路的連接,正確讀數,以及電流表的維護方法。
  1)根據被測量準確度要求,合理選擇電流表的準確度。一般地講,0.1-0.2級的磁電系電流表適合用于標準表及精密測量中;0.5-1.5級磁電系電流表適合用于實驗室中進行測量;1.0—5.0級磁電系儀表適合用于工礦企業中作為電氣設備運行監測和電氣設備檢修使用。
  2)根據被側電流大小選擇相應量限的電流表。量限過大會造成測量準確度下降,量限過小會造成電流表損壞。為充分利用儀表的準確度,應當按盡量使用標尺度的后1/4段的原則選擇儀表的量程。
  3)合理選擇電流表內阻。對電流表要求其內阻越小越好。

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