Fluke 4180 [24/30] Forced air and convection

Fluke 4180 [24/30] Forced air and convection
4180, 4181 Precision Infrared Calibrator
Forced Air and Convection
18
and the physical limits of the instrument, the temperature range of the instrument may
be limited from the specied range when using an emissivity setting other than 0.95. A
table of this limitation is shown in Table 3.
Apparent temperature limitsTable 3
4180 4181
e HI (°C) LO (°C) HI (°C) LO (°C)
0.90 120.0 –15.0 500.0 35.0
0.91 120.0 –15.0 500.0 35.0
0.92 120.0 –15.0 500.0 35.0
0.93 120.0 –15.0 500.0 35.0
0.94 120.0 –15.0 500.0 35.0
0.95 120.0 –15.0 500.0 35.0
0.96 119.2 –14.5 496.6 35.0
0.97 118.4 –14.0 493.2 35.0
0.98 117.6 –13.5 489.8 35.0
0.99 116.8 –13.0 486.4 35.0
1.00 116.0 –12.5 483.0 35.0
Forced Air and Convection3.6
Since the 4180 and 4181 have a large surface area, a major component of the tempera-
ture uncertainty is caused by changes in convection. Because of this, the user should
keep the instrument away from areas with large amounts of air ow or drafts.

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