MarkMoss
2008-07-29 16:40:09 UTC
Figures 5 through 9 of the operating instructions for the NI-9211 4-Channel Thermocouple Input Module contains several charts that give typical and maximum measurement error under various conditions and for various types of thermocouples. These charts cover a very wide range of temperatures. For example, the Type K chart covers -200 °C to +1400 °C with a division only every 200°C. This makes it difficult to user these charts to determine the maximum measurement error at a specific temperature.
Is there a forumla or table of values I can use to determine the maximum measurement error for a smaller range of temperatures? Specifically, I'm interested in determining the maximum measurement error for measurements between -40 °C and 125 °C with a cold-junction temperature of 23 °C ± 5 °C for measurements type J, K, and T thermocouples. (Not including errors due to the accuracy of the thermocouple itself.)
Thanks,
Mark Moss
Electrical Validation Engineer
GHSP
Is there a forumla or table of values I can use to determine the maximum measurement error for a smaller range of temperatures? Specifically, I'm interested in determining the maximum measurement error for measurements between -40 °C and 125 °C with a cold-junction temperature of 23 °C ± 5 °C for measurements type J, K, and T thermocouples. (Not including errors due to the accuracy of the thermocouple itself.)
Thanks,
Mark Moss
Electrical Validation Engineer
GHSP