VI program to measure voltage and current instead of temperature at thermocouple

[sci92]

Is there are program or set-up to do this.

I have in the lab a set-up that will measure temperature at the thermocouple. I would like to measure the voltage across the thermocouple or, better yet, the voltage difference between the two thermocouples which is measuring the temperature difference on a wall at a given position.

[trussell]

What are you using to measure the thermocouple? A/D card?

[tbob]

The voltage across a thermocouple device leads is usually very small, in the range of millivolts or even microvolts. You will need a voltmeter that can accurately read such small voltages, which usually involves using the 4-wire measurement mode. Keithley and Agilent both make DMMs that can measure small voltages. Your labview vi could communicate with the DMM through GPIB. You would have to know how to convert the voltage to temperature in order to make your application useful. Why would you want to measure voltage/current then convert to temperature as opposed to just reading the temperature itself? If this is what you really want to do, you can also convert the temperature into voltage by using the thermocouple's data sheet that comes from the manufacturer. There should be some type of graph showing what voltage corresponds to what temperature. This might be an easier task.