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Appendix A
The histograms shown in
distribution for each of the available filter types on the DT9871. Note that converting μV error
to temperature error depends on thermocouple type. For example, a K thermocouple changes
approximately 39 μV per degrees C; therefore, a noise level of 10 μV adds 0.3
/ 39 μV) for a type K thermocouple.
Figure 34: System Noise on the DT9871 Using No Software Filter (Raw Filter)
Figure 35: System Noise on the DT9871 Using the Moving Average Filter
110
Figure 34 andFigure 35
characterize the Gaussian system noise
°
C error (10 μV
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