Spectrum Controls 1746sc-NI8u - Manual (Page 89)

Appendix A: Module Specifications 77
The diagrams that follow for each thermocouple type, give data for a
sample module over the input range of the thermocouple, over
temperature. Thermocouples are usually parabolic in their µV to degrees
C curves. Normally, at the ends of any given thermocouple range, the
ratio of change in temperature increases as a result of a change in voltage.
In other words, at the ends, a smaller change in voltage results in a larger
change in degrees.
Thermocouple Type J, Example Deviations
-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
-210 -110 -10 90 190 290 390 490 590 690 790
Degrees C TC Input
Degrees C Deviation
Ch 2 Delta, 25C
Ch 2 Delta, 0C
Ch 2 Delta, 60C
Thermocouple Type K, Example Deviations (Low Range)
-0.5
0
0.5
1
1.5
2
2.5
3
-270 -260 -250 -240 -230 -220 -210 -200
Degrees C TC Input
Degrees C Deviation
Ch 2 Delta, 25C
Ch 2 Delta, 0C
Ch 2 Delta, 60C