07-10-2020 06:12 AM
I have a Pt1000 temperature sensor and I am having a hard time understanding the value I'm getting.
The temperature should be around 20-25C and I am expecting to get a value of the resistance of around 1000ohm but I am getting a value of 25ohm.
Could someone explain to me if that's possible that I get the value of temperature directly like that ? I am using NI 9226 as an input/output Module in a compactRIO chassis
07-10-2020 05:55 PM
It would be good to share the connection diagram and code used to help you better
07-15-2020 09:42 AM
So I figured out why I was getting the value I was getting, the module was configured to calibrate the values it is getting first so now I configured it to show the raw values and now I am again getting wrong values. I am getting around 1M Ohm which is so high, I am expecting only 1000ohm.
I attached my connection diagram and here is the documentation from National Instruments that I followed: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019MQSSA2&l=de-DE
The program itself is actually pretty simple I just used FPGA I/O Node to read the measurment of the sensor so I exclude that the programming is the reason for my problem.
What I also did was measuring the resistance of the Pin connector at the pins I am using and at the Sensor connector and I got from both the measuring that I'm expecting to get (1000ohm). Is there anything else I should do before I give up and say that the module is malfunctioned?
07-27-2020 06:01 AM
Your "Wiring diagram" makes no sense. Why is there no connection to the excitation terminal?
07-29-2020 04:31 PM
Because it's a two wire-connection not a 3 or 4 wire connection. Did you check the national instruments document I posted the link to?
I eventually got the right values with that "wiring diagram".