Rockwell Automation 1734-IT2I Thermocouple and RTD Input Module User Manual - Manual (Page 79)

69 Publication 1734-UM004F-EN-E - December 2012
Appendix
B
Calculate Absolute Accuracy and
Accuracy Drift
Overview The Absolute Accuracy and Accuracy Drift with temperature specification
applies only to mV input for 1734-IT2I, and to ohms input for 1734-IR2 and
1734-IR2E modules. These specifications are listed in the POINT I/O RTD
and Isolated Thermocouple Input Module Installation Instructions,
publication
1734-IN011 .
Use mV input (1734-IT2I) or ohms input (1734-IR2 and 1734-IR2E) to verify
the Absolute Accuracy or Accuracy Drift of the POINT I/O modules.
Calculate with Formulas Here are the formulas for calculating Absolute Accuracy and Accuracy Drift in
mV or ohms.
Absolute Accuracy Formula
Absolute Accuracy measurement is to be done at 25 ⋅ C. The formula to
calculate Absolute Accuracy is as follows:
[(measured value - expected value)/ full scale] x 100 %
Accuracy Drift Formula
Accuracy Drift measurement is to be done at 2 ambient Temperature points:
T1 and T2. The formula to calculate Accuracy Drift is as follows:
[(measured value (T2) - (measured value (T1)]/ [(T2 - T1) x full scale] x
1000 000