根据电流表（或电流电压表）拨号上显示的mv数量，选择分压器（通常为75mv或45mv）的额定电压降规范。如果电流表没有这个值，则使用以下公式计算电流表的电压限值，然后选择并联机组的额定电压降规范。当电流表满时，电压限制（mv）电流（a）内阻（）x1000电流表。按欲扩大的电流量程选择分流器的额定电流规格。
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