RayTek ThermoView Ti30 - Manual (Page 77)

Display Resolution
The level of precision to which a temperature value can be displayed, usually expressed in
degrees or tenths of degrees.
Drift
The change in instrument indication over a long period of time, not caused by external
influences on the device (per the ASTM standard test method E 1256-88).
EMC
Electro-Magnetic Compatibility is the resistance to electrical signal disturbances within IR
thermometers.
Emissivity
Emissivity is the ratio of infrared energy radiated by an object at a given temperature and
spectral band to the energy emitted by a perfect radiator (blackbody) at the same
temperature and spectral band. The emissivity of a perfect blackbody is unity (1.00).
EMI/RFI Noise
Electro-Magnetic Interference/Radio Frequency Interference (EMI and RFI) may cause
disturbances to electrical signals within IR thermometers. EMI and RFI noise is most
commonly caused by devices by switching motors (air conditioners, power tools,
refrigeration systems, etc.).
°F (Fahrenheit)
Temperature scale where .
67 . 459 R 32 ) 8 . 1 C ( F q u q q
Far Field
A measured distance substantially greater than the focus distance of the instrument; typically
greater than 10 times the focus distance.
Field of View (FOV)
The region, at the target, measured by the IR thermometer. Typically presented by giving the
spot diameter as a function of distance from the instrument. Also presented as the angular
size of the spot at the focus point.
See Optical Resolution.
July 1, 2003 - 77 - Version 1.0
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