AnsweredAssumed Answered

AD7793 discontinuous output signal

Question asked by YCLo on Jul 25, 2016
Latest reply on Feb 1, 2018 by vijay5264

Hi ,

Recently, i am working on a project of using AD7793 with Arduino mini pro as accuracy temperature measurement,

I am using 4-wire PT1000 , 5.1k ohms (use multimeter measure 5.237k ohms) as ref resistance.

AD7793 set ( Continuous read , Gain 4 , bipolar, external reference, current 210uA, update rate 4.17Hz . )

The Arduino code and Matlab data acquisition code are posed as follow.

But i get weird "discontinuous" output signal, seems it get different offset when the temperature rise or fall .

please help me out.

Thanks a lot



Wire :

螢幕快照 2016-07-25 下午4.03.55.png

Arduino code :

螢幕快照 2016-07-25 下午3.58.40.png

Matlab code :

螢幕快照 2016-07-25 下午3.57.53.png

Data :

螢幕快照 2016-07-25 下午3.50.33.png