Can't get linearity from 1746-NT4/mV module

[Deer]

Hi,

I have a problem with my 1746-NT4 thermocouple/Mv module, actually with this module i would like to injected with milivolt injector (0-50 mv), but I can't get linearity value from this module.
Following are sample point using milivolt injector:
mv Injector PLC value
0 mv 435
10 mv 2010
20mv 4000
30mv 4225
40mv 6000
50mv 7345

What happend with it and does any body here have experience with this case?

Rgds,
Deer

 

[Mickey]

How do you have the card configured? ( input type, data format )See Pic and PDF

 

[CharlesM]

I think Mickey has the solution. Thermocouples are not linear so if you have the modules setup for a TC type then you would get a non linear reading when a linear input is applied.