TBX-68T temperature measurement errors

I am using a TBX-68T with a PXI 4351 card to measure the temperature of a steel plate while the plate is undergoing a TIG (electric arc) welding process. To my knowledge (and based on past experience), the device is connected properly in MAX, with the TBX-68T selected as the accessory. In MAX it also passes the tests. Using the built in CJC and specifying a K-type thermocouple at a range of +/-0.625v, MAX reports temperatures of -80C. The temperature remains nearly the same as the range is increased, but if I change the range to +/-3.75v, the temperature suddenly jumps to 100+C. I used the Measure Thermocouple (with accessory).vi that comes with the driver, and it gives me the same readings. Furthermore, when I initiate the TIG welder the card reads extremely negative (-10e9) temperatures.
What is odd, is that I have used these devices for the exact same process in the past and it generated believable results.
How can I fix the current temperature offset problem? Could I have possibly damaged the unit? Is it possible to use the TBX-68T to reliably detect temperature in arc welding process?
Thanks,
William

Hello,
Becasue TIG welding creates a large electrical discharge I am concerned that you may have shorted the card. What kind of isolation did you use to ensure a separation between the TIG process and the temperature measurement? Because the error is read by both your program and MAX it must be either the temperature configuration or the card. Could you try to conduct a simple Voltage measurement with the 4351, lets say a AA battery. You should be able to read 1.5-1.6V. If this works than the card should be fine, (make sure to test all channels that are failing).
If you cannot read the proper voltage on the card, then it is possible that the card will need to be repaired. Please update us so we can help you further.
Thank you
Regards,
CharlesD
Digital MultimetersSchedule a Free 1 Hour LabVIEW Tutorial with an NI Applications Engineer

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Traditional ni daq using tbx 68t with error 10685

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Attachments:
thermocouple example.vi ‏37 KB

Hi again Notay,
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See the data sheet or manual linked bellow for more information.
http://www.ni.com/pdf/products/us/2mhw296-297e.pdf
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Tom,
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Help needed with temperature measurement

hi guys
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Message Edited by MikeS81 on 05-18-2008 02:44 PM
Attachments:
Unbenannt1.PNG ‏30 KB

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Hi Guys
i am using NI 435X and TBX 68T to read in voltage using excitation current of 1 mA passing thru resistors
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Hello yongster. Please refer to the forum at http://forums.ni.com/ni/board/message?board.id=170&message.id=222104 which you created first about this question. All of your questions will be addressed here. I understand that due to the Holiday and the weekend, your question went unanswered for a couple days and I am sorry for that. However, in the future, please refrain from posting the same question in numerous places as it causes confusion and clutter in the discussion forums.
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Sheng,
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