HELP. temp to voltage conversion.

[Saipanman]

I am currently trying to find a better way to calibrate thermocouple read outs. I would like be able to enter any temp for any TC and have labView output the corresponding voltage needed. So I was hoping that someone would have a way to do this temp to voltage conversion. Example if I want to do 250 C I need 10.153 mV how could labView be made to calculate this.

[Dennis_Knutson]

If you are using an NI DAQ board and DAQmx, simply using the temperature>thermocouple version of the DAQmx Create Channel will automatically perform the conversion when you do the DAQmx Read. Otherwise, use the 'Convert Thermocouple Reading' function.

[Saipanman]

Thank for your help

My set up is just the lap top, a dc power supply and a reference TC in an ice bath which should simulate any temp for the readout. If I could get the voltage level I could easy send this. 

Is there any VI’s that can do this

[Dennis_Knutson]

You need something to physically measure the voltage. LabVIEW is software and obviously cannot measure anything by itself.

[Saipanman]

Thank you again for your help

In my program there is no need for a measurement it is purely a simulated level. The user would type in the temp that he would like to simulate, such as 250 ˚C and labview would convert this to millivolts and tell the DC supply output 10.153 mV. This would allow the Unit under test to see 250 ˚C. The simulated temp could then be changed and the conversion done for the new temp.

[falkpl]

SOMETHINGS NOT RIGHT WITH THIS BLOCK DIAGRAM??? I CANT COERSE THE T.C. WIRES

do you have a daq device?

[Dennis_Knutson]

Look at the subVIs in the function I mentioned. See the Temperature to Volts subVI

[Saipanman]

There is no TC or Daq. I am only simulating a TC with a DC supply. This program only controls the DC supply.

[nitad54448]

read again the previous posts !

you already have two vi's Temperature to volts and Volts to Temperature that use NIST polynomial approximations for all decent thermocouples. you don't need to use an ice bath, make the cold junction correction. see the NI pages for maaaaaaany explanations on this.

N

[Saipanman · Accepted solution]

 This will let you enter the temp you want to simulated and out the corresponding voltage.