Fluke Ti30, User Manual, Page: 99 / 104

Focus Point (or Distance)
The distance from the instrument where the optical resolution is greatest.
Full Scale
The maximum of the temperature range or output signal.
Full Scale Accuracy
A convention for expressing the accuracy as percentage of an instrument’s (highest) full-
scale temperature.
Gray Body
A radiating object whose emissivity is in constant ratio (not unity) at all wavelengths to that
of a blackbody at the same temperature, and does not transmit infrared energy.
HAL
High Alarm. Units with this feature can sound an alarm when they sense that a user-defined
high temperature has been reached.
Hertz (Hz)
Units in which frequency is expressed. Synonymous with cycles per second.
Infrared (IR)
The portion of the electromagnetic spectrum extending from the far red visible at
approximately 0.75
µ m, out to 1000 µ m. However, because of instrument design
considerations and the atmospheric windows, most infrared measurements are made
between 0.75
µ m and 20 µ m.
Infrared Thermometer
An instrument that converts incoming IR radiation from a spot on a target surface to a
measurement value that can be related to the temperature of that spot.
K (Kelvin)
Jan 31st, 2005 - 99 -
15 . 273 C K
+ ° =
The unit of absolute or thermodynamic temperature scale where 0 K is absolute zero and
273.15 K is equal to 0° C. There is no (°) symbol used with the Kelvin scale, and
.