Two measures of different thermocouples 1303

Hi all

I use a SCXI-1303 module and a module SCXI-1102 and SCXI-1000 chassis. The plan is to measure the temperature using thermocouples type T. 1303 modules (I have 3 of them) are completely new, and I pulled out of the box and put them on my 1102. I was testing my thermocouples to ensure they all worked when I noticed a difference in temperature between some of the thermocouples. When I started using AI16 (0-15 was already in use) temperature readings began to appear about 4 degrees below all other temperatures. Most of the thermocouples read 21 c, which is good, but those channels AI16-19 (I'm not plus far only 19), have been reading of 16 C. So I swapped the thermocouples, who had read the right temperature (from AI15) set AI16 and he showed the same offset of 4 degrees, so should not be a thermocouple problem. I put the 1303 on another module of 1102 and I swapped the 1303 modules, I had the same problem each time. The polarization resistance came in 1303 modules, so I have not tested with them. I get the same temperature difference using "integrated" and "constant" for the source of the CJC. I can hardly believe that it's a hardware problem, scxi-1303 1102 both had the same result. So I was hoping there is something else here I'm missing. I looked in the forums and not found anything quite like my problem. I read the manuals but have not encountered anything that would explain this.

Please let me know if you need more information,

Thank you

Jim

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Well, I feel stupid. When you use the wizard daq, you must specify the type of thermocouple for each channel. I've had several channel sent to the type of thermocouple wrong without realizing it. Switching the appropriate type, made them of course work.

Heh, sorry for the useless post

Jim

Tags: NI Hardware

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