E+H数字式电极CPS11E-AA7FAA2
(1)基准要稳,4mA是对应的输入零位基准，基准不稳，谈何精度线性度，冷开机3分锺内4mA的零位漂移变化不过4.000mA0.5%以内;(即3.98-4.02mA),负载250Ω上的压降为0.995-1.005V，国外IC心片多用昂贵的能隙基准，温漂系数每度变化10ppm；
(2)内电路计消耗电流＜4mA,加整定后等于4.000mA,而且有源整流滤波放大恒流电路不因原边输入变化而消耗电流也随之变化，国外IC心片采用恒流供电；
(3)当工作电压24.000V时,满量程20.000mA时,满量程20.000mA的读数不会因负载0-700Ω变化而变化;变化不过20.000mA0.5%以内；
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