Cannot read temperatures correctly using 4351 and TBX-68T

[AEI_JR]

When using a PCI-4351 with a TBX-68T block, I cannot read K-type TCs correctly using the built-in CJC. When reference temp. value is set to 25 deg. C, temps read close to actual.

I have tried replacing the PCI card, shielded cable, and terminal block. I also have reinstalled NI-DAQ, and reinstalled the hardware drivers many times.

[Michael_S.]

You will want to make sure that you select TBX-68T as an accessory in the properties for the 4351. The properties tab can be found in MAX by highlighting the board, right clicking with the mouse and selecting Properties. Otherwise it will not read the CJC from the tbx-68t correctly.

You may also wish to download the 435x driver from the website if you have not already done so. The 435x driver makes it easier to program the board and use the extra features that a normal DAQ card does not have, such as Auto Zero (with tbx-68t). The driver can be found on the web at www.ni.com and follow the Downloads link to Drivers and Updates for the NI-435x.

[Jim Johnson]

I had the same problem and tried the suggestions offered and it still will not work right. Any other suggestions?

JJ

[proton]

I had the same problem too, using a 4350-USB, a TBX-68T, and a Dell notebook. The suggested solutions did not work for me either.

However, my DAQ system is more stable when connected to a desktop PC running Win2000. I am currently testing whether a dirty laptop power supply may be the problem.