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AD7794/5, how to measure RTD on single current source?

Question asked by riscy00 on Mar 29, 2012
Latest reply on Apr 4, 2012 by MaryMc

Hi

 

I have implemented source code for a MCU to driver the AD7794/7795 and able to configure and measure various voltage and H bridge.

 

Now I looking into RTD measurement which involve current source. I have scanned the AD website and to my surprise, they say only about feature of RTD measurement but say nothing on how measure RTD with two different current source nor equation.

 

Can anyone direct me to relevent material or book detailing how to configure AD7794/5 in step and measure RTD and provide equation as necessary how to calculate the RTD. I'm not interested in feature, I'm more interested in practical implementation.

 

AD7793 diagram shown two IOUT connection where AD7794/95 diagram shown only one IOUT connection (which I have implemented), why they differ?,

 

Can anyone demonstrate "how" to implement them and what step based on one current source?

 

R.

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