3AL78856BB L-4-1-N_廈門仲鑫達科技有限公司

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3AL78856BB L-4-1-N

好串連不超過2只表,一般的4-20ma變送器能帶的負載略大於500歐,而儀表的電流輸入端大部分情況下並的是250歐電阻轉換成1-5V。一般情況下可以串接幾塊電流表。其原因為：用4-20ma電流做遠距離傳送信號，在傳送終端都接有500歐或250歐標準電阻，使4-20ma的電流信號在其電阻上產生與之成比例的2-10V或1-5V的電壓信號，一般情況下這個電壓值比電流源容許外電阻的大電壓值要小5-10V以上，這多出的5-10V電壓就是為傳送導線內阻及串接電流表產生電壓降用的，電流表的內阻都是很小的，只要傳送導線內阻及串接的幾塊電流表的內阻產生的電壓降之和<這多出的5-10V電壓，就不會影響信號傳送精度。

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3AL78856BB L-4-1-N