M310-HT Manual
Appendix A: Calibration & Emissivity
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21
Example 1:
The M310HT (450
°
C) blackbody was factory calibrated to provide effective
emissivity = 1.0 at 8-14 µm. You wish to use this source for a narrow band pyrometer at 7.5 µm.
At this wavelength from the graph above, the blackbody exit radiance will be approximately
equivalent to a blackbody that has emissivity = 1.011. This will cause your pyrometer to receive
1.1% more infrared energy causing it to read a higher temperature. The table below shows the
expected error. At 250
°
C, this pyrometer will read 251.4
°
C or 1.4
°
C high, so you should set the
blackbody setpoint to 248.6
°
C (250-1.4).
Normalized emissivity after 8-14um radiance calibration on the HT (450C) version
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
1.01
1.02
0
5
10
15
20
25
30
e
