Trying to use thermocouple to measure voltage

[kkofori]

oh okay thank you if I get what you are saying you cant physical measure but you can mathematically deduce the answer. Can you further explain that for me please

[kkofori]

I have also notice the keysight daq 970 allows for a reference channel for voltafge measurements will this help me in finding the difference with respect to ground

[RTSLVU]

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@kkofori wrote:

oh okay thank you if I get what you are saying you cant physical measure but you can mathematically deduce the answer. Can you further explain that for me please

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When you need to know the difference between two voltage measurements, you measure both voltages and subtract them to find the difference.

[kkofori]

that is what I  do right now I measure V1 and V2 at both thermocouple points and subtract but that does not give me the right answer . I have used a a material with a known voltage to validate do this. So my seebeck coefficient set up gives me the accurate temperature but voltage is totally , i have learned that subtacting generated voltage at the ends of the thermocouples does not give we the actual potential difference between those two points

[kkofori]

whenever I use my seebeck coefficient  setup to  test materials I keep getting the exact seebeck coefficient of constantin which is the material of the K type thermocouple

[RTSLVU]

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@kkofori wrote:

that is what I  do right now I measure V1 and V2 at both thermocouple points and subtract but that does not give me the right answer . I have used a a material with a known voltage to validate do this. So my seebeck coefficient set up gives me the accurate temperature but voltage is totally , i have learned that subtacting generated voltage at the ends of the thermocouples does not give we the actual potential difference between those two points

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We have been over this you can't do what you want to do the way you are doing it.

The two thermocouples are NOT going to give you the voltage on the device.