Fluke Ti20 User Manual download pdf (Page 54)

Ti20

Users Manual

A-4

Level

Level is the median point of a given temperature scale. For example, if the unit is

currently in Automatic mode, and there is a given thermal scene with MIN and MAX

temperature limits, the moment you switch the unit to Manual mode, the Level value is

set by the unit according to the following formula:

Max Span

Level =

+ Min Span

dag129f.eps

Micron (or µm)

-6

meters (m), or 0.000001 m.

Minimum spot size

The smallest spot an instrument can accurately measure.

NETD

Noise Equivalent Temperature Difference. Peak to peak system electrical noise normally

measured at the output (display or analog) expressed in °F or °C.

NIST Traceability

Calibration in accordance with and against standards traceable to NIST (National

Institute of Standards and Technology, USA). Traceability to NIST is a means of

ensuring that reference standards remain valid and their calibration remains current.

Non-Gray Body

A radiating object that is partly transparent to infrared (transmits infrared energy at

certain wavelengths); also called Colored Bodies. Glass and plastic films are examples of

non-gray bodies.

Optical Pyrometer

A system that, by comparing a source whose temperature is to be measured to a

standardized source of illumination (usually com-pared to the human eye), determines the

temperature of the former source.

Optical Resolution

The distance to size ratio (D:S) of the IR measurement spot, where the distance is usually

defined at the focus distance, and the size is defined by the diameter of the IR energy spot

at the focus (typically at the 90% IR energy spot diameter). Optical resolution may also

be specified for the far field by using values of far field distance and spot size.

Pyroelectric Detector

Infrared detector that behaves as a current source with an output proportional to the rate

of change of the incident IR energy.

Radiation Thermometer

A device that calculates an object’s temperature (given a known emissivity) from

measurement of either visible or infrared radiation from that object.

Reflectance

The ratio of the radiant energy reflected off a surface to that incident on the surface; for a

gray body this is equal to unity minus emittance; for a perfect mirror this approaches

unity; and for a blackbody the reflectance is zero.

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Fluke Ti20 User Manual Page 54

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