现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
19期
63-65
,共3页
二线制变送器%正弦信号发生器%MSP430F149%DDS%AD9851
二線製變送器%正絃信號髮生器%MSP430F149%DDS%AD9851
이선제변송기%정현신호발생기%MSP430F149%DDS%AD9851
two-wire transmitter%sinusoidal signal generator%MSP430F149%DDS%AD9851
针对电压型变送器远距离传输信号质量差的缺点，提出了利用输入为1~2 kΩ、输出为4~20 mA的二线制电流型电阻变送器实现远距离控制DDS频率合成芯片AD9851的目标，以产生1~2 MHz的正弦信号。实验结果表明，采用二线制电流型电阻变送器能够实现远距离数据传输，电阻与频率非线性度非常理想。
針對電壓型變送器遠距離傳輸信號質量差的缺點，提齣瞭利用輸入為1~2 kΩ、輸齣為4~20 mA的二線製電流型電阻變送器實現遠距離控製DDS頻率閤成芯片AD9851的目標，以產生1~2 MHz的正絃信號。實驗結果錶明，採用二線製電流型電阻變送器能夠實現遠距離數據傳輸，電阻與頻率非線性度非常理想。
침대전압형변송기원거리전수신호질량차적결점，제출료이용수입위1~2 kΩ、수출위4~20 mA적이선제전류형전조변송기실현원거리공제DDS빈솔합성심편AD9851적목표，이산생1~2 MHz적정현신호。실험결과표명，채용이선제전류형전조변송기능구실현원거리수거전수，전조여빈솔비선성도비상이상。
For the poor signal quality in remote communication of voltage transmitter,a two-wire resistance-to-current trans-mitter with its input resistance of 1~2 kΩ and its output current of 4~20 mA is proposed in this paper to control the frequency synthesis chip AD9851of direct digital synthesizer(DDS)in long distance,so as to generate a sinusoidal signal with 1~2 MHz by AD9851. The experimental results show that the two-wire resistance-to-current transmitter can realize remote data transmis-sion. Moreover,the non-linearity of resistance and frequency is perfect.
