Question on using thermocouples in SCB68 board

[Adzel]

Hello,

I am using thermocouples with an SCB68 connector block.

I am also using 2 pressure transducers that are powered via the connector block's 5V source (ch 14).

The thermocouples seem to be having problems in the data that I see, although the pressure transducers run fine.

Can I use t/c's with the transducers that require power. Is the 5V somehow disrupting the t/c's?

Also, all are beign run in differential mode.

Thanks.

[EdDickens]

What kind of problems are you seeing? Not the correct level, noisy signal.... Do the TCs work with the pressure transducers disconnected? Is your analog input setup as a voltage or a temperature reading. If it's a temperature, do you have to correct type of TC selected. Are you using DAQ or DAQmx.

The SCB-68 should be able to handle TCs. It even has a cold junction compensation sensor to account for the TC to terminal block connection. This does work pretty good, but if want very accurate TC reading, you should be using SCXI or even SCC.

Try the TC by themselves with one of the examples that ships with LabVIEW. Make sure it uses the cold junction compensation sensor. There's a pretty simple one called "Acq Thermocouple Sample.vi" you can get to using the Example Finder. Just search for "Thermocouple" and it will be in the list.

Ed

[Conseils]

Remember that the thermocuople voltage will be in the micro volt range......
I suspect that the range is incorrect, also watch out for noise i.e. crosstalk