Raytek 3i User Manual download pdf (Page 73)

Raynger 3i Series Operator's Manual Glossary-1

Absolute Zero

The temperature (0 Kelvin) of an object

defined by the theoretical condition where the

object has zero energy.

Accuracy

Maximum deviation, expressed in tempera-

ture units, or as a percentage of the tempera-

ture reading, or as a percentage of the full

scale temperature value, or as a percentage of

the target temperature, indicating the differ-

ence between a temperature reading given by

an instrument under ideal operating condi-

tions, and the temperature of a calibration

source (per the ASTM standard test method E

1256-88).

Activate

Pressing the activate button (available on vari-

ous units) while in different modes can acti-

vate alarms and TAM, or toggle between digi-

tal and analog outputs or between °C and °F.

Ambient Derating

Refer to Temperature Coefficient.

Ambient Operating Range

Range of the ambient temperature conditions

over which the thermometer is designed to

operate.

Ambient Temperature

Room temperature or temperature surround-

ing the instrument.

Ambient Temperature Compensation (TAMB)

Refer to Reflected Energy Compensation.

ASTM

American Society for Testing and Materials.

Atmospheric Windows

Infrared spectral bands in which the atmos-

phere best transmits radiant energy. Two pre-

dominant windows are located at 2-5 µm and

at 8-14 µm.

AVG

Average. Units with this feature have the abil-

ity to display the average of measured temper-

atures. AVG is a weighted average of all read-

ings taken since the trigger was pulled.

Background Temperature

Temperature behind and surrounding the

target, as viewed from the instrument.

Blackbody

A perfect emitter; an object that absorbs all

the radiant energy incident on it at all wave-

lengths and reflects and transmits none. A

surface with emissivity of unity (1.00).

°C (Celsius)

Temperature scale based on 0° (zero degrees)

as the freezing point of water, and 100° as

the vaporization point of water, at standard

pressure. °C = (°F - 32) ÷ 1.8.

Calibration

A methodical measurement procedure to

determine all the parameters significantly

affecting an instrument’s performance.

Calibration Source

A source (blackbody, hot plate, etc.) of

known and traceable temperature and emis-

sivity. Usually NIST traceable in the USA,

with other recognized standards available

for international customers.

Colored Body

See Non-Gray Body.

D:S

Distance to size ratio. See Optical

Resolution.

Detector

Transducer which produces a voltage or cur-

rent proportional to the IR energy incident

upon it. See also thermopile, pyroelectric,

and Si detectors.

Dielectric Withstand Voltage

(Breakdown Voltage)

The voltage up to which a dielectric (insula-

tor) can endure before conduction through

the material occurs.

DIF

Differential. When this mode is activated,

the difference between the temperatures of

the last series of measured temperatures dis-

plays.

Glossary Of Terms

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