Thermocouple and SCB-68

[Clint1000]

I'm looking at a colleagues code on a teststation.  He is using a Type J thermocouple tied into a scb68 connector 0 on a PCI-6229 DAQ.  He configured the daq correctly in MAX...connector 0 has an accessory w the thermocouple box checked.  If I look at the scb 68 specs it looks like I have to use AI0/AI8 as a differential measure to measure temp.  My colleague is using AI1/AI9.  He is also using daq assistant in his code.  He has chosen the correct setting in daq assit..thermocouple/on board cjc..etc. 

My question is:

Can you use any  analog channel in on the scb68 to measure temp or does if have to be AI0/AI8...

Also, how do you select differential in DAQ Assistant??

Thxs..

[Gregory]

Keep in mind the SCB68 is just a connector that exposes the terminals of the PCI card. I looked at the PCI-6229 card and I saw no mention of thermocouples, so I'm not sure if it is capable.

[Clint1000]

Hey gregoryj,

I realize the SCB68 is basically a breakout box for the daq card.  You have to configure the switches correctly and the accessories correctly in MAX because of the CJC on the SCB68.  When I looked at his LV code he is using daq assistant, obtaining "x" number of points...taking the RMS value then converting to temperature in "F".   (9/5*C+32).  I'm guessing he is doing this because as I said he setup DAQ Assit to measure "thermocouple" and the "on board" CJC.  I looked further and found the SCB-68 User Guide and SCB-68 User Manual for Advanced Functions.  On pg 6 , opt 3 of the user guide it shows how to config scb68 for temp/differential so that kind of answered one of my questions.  But the 3rd opt says its read on  AI0/AI8.  So is that the only channel I can use for temp measurement?

[Gregory]

The specs for that card say that it has 32 single ended or 16 differential analog inputs. So you should be able to use 15 other inputs besides AI0/AI8. In some places it is labeled more clearly as AI0 (AI0+) / AI8 (AI0-), AI1 (AI1+) / AI9 (AI1-), etc.

Take a look at page 3 and 9 of this SCB-68 label.