RayTek ThermoView Ti30 - Manual (Page 81)

Reflected Temperature Compensation
Correction feature used to achieve greater accuracy when, due to a high uniform background
temperature, IR energy is reflected off the target into the instrument. If the background
temperature is known the instrument reading can be corrected by using this feature. Targets
that have low emissivities will reflect energy from nearby objects, which may result is
inaccurate readings. Sometimes objects near the target (machines, furnaces, or other heat
sources) have a temperature much higher than that of the target. In these situations it is
necessary to compensate for the reflected energy from those objects. (RTC has no effect if
the emissivity is 1.0.)
Relative Humidity
The ratio, expressed as a percent, of the amount of water vapor actually present in a sample
of air to the greatest amount of water vapor possible at the same temperature.
Repeatability
The degree to which a single instrument gives the same reading on the same object over
successive measures under the same ambient and target conditions (per the ASTM standard
test method E 1256-88).
Resolution
See Temperature Resolution or Optical Resolution.
Response Time
A measure of an instrument’s change of out-put corresponding to an instantaneous change
in target temperature, generally expressed in milli-seconds, for 95 percent of full scale
temperature indication (per the ASTM standard test method E 1256-88). The specification
for Raytek instruments also includes the average time required for software computations.
Scatter
See Size of Source Effect.
Size of Source Effect
An undesirable increase in temperature reading caused by IR energy outside the spot
reaching the detector. The effect is most pronounced when the target is much larger than the
field of view.
July 1, 2003 - 81 - Version 1.0
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