【摘要】 以单片机89c51为中心控制器构成的直流电流源,控制电路的采样信号和控制信号传输通道分别用ADC7135和AD7541A来实现。使得控制精度达到了步进1mA,量程20mA～2000mA,纹波电流≤0.2mA,远远的超过题目要求。更多还原

【Abstract】 This paper introduces the DC current source with main contoller that is single-chip computer 89c51.The transport channels of sample and control signals is control circuits.The ADC7135 is used to the sample signal circuit and AD7541A is used to control signal circuit.The technique indexes arrive to control precision of step 1mA,measure range of 20mA～2000mA,vein wave electric current within 0.2mA.These indexes have largelly exceeded demand indexes.更多还原