Fluke Ti20 user manual Reflected Temperature Compensation

Page 37

Basic Operation 2

Reflected Temperature Compensation

Reflected Temperature Compensation

Targets that have low emissivities will reflect energy from nearby objects. This additional reflected energy is added to target’s own emitted energy and may result in inaccurate readings. In some situations 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. The concept of reflected temperature compensation is illustrated in Figure 2-5.

Note

The Reflected Temperature Compensation (RTC) feature is disabled when the emissivity is set to 1.00.

Reflected Energy

Emitted Energy

dag006f.eps

Figure 2-5. Reflected Temperature Compensation

2-13

Image 37

Contents Ti20 Limited Warranty and Limitation of Liability Table of Contents Ti20 List of Tables Ti20 List of Figures Ti20 Introduction Getting StartedContacting Fluke Symbols Safety InformationLaser Warning Labels Ti20Unpacking the Imager Standard AccessoriesUnpacking the Imager Ti20 Features and ControlsOperating the Controls Focusing the ImagerUnderstanding the Trigger Ti20Using the AC Power Adapter Using the AC Power AdapterCharging and Replacing the Batteries Using the Battery ChargerReplacing the Battery Pack Installing or Replacing the BatteriesAttaching the Wrist Strap Attaching the Wrist StrapInputs and Connections Connecting the USB CableCleaning the Case CleaningMounting the Imager on a Tripod Cleaning the Lens Ti20 Turning the Imager On and Off Basic OperationImager Home Display Zones Understanding the Home DisplayContents of the Home display is described in Table Aiming and Activating the Laser Comparing Frozen Images to Stored Images Capturing ImagesAdjusting the Backlight Setting the Level Setting the Temperature ScalePress Flevel to access the set Level function Using Distance to Spot Size Ratio DS Adjusting the SpanManually Activating the Calibration Flag FOV Environmental Conditions Ambient Temperature Derating and Thermal ShockTape method EmissivityContact thermometer method Reflected Temperature Compensation Reflected Temperature CompensationTi20 Data Management and Storage Advanced Imager OperationViewing Stored Images Deleting Images Selecting a Palette Adjusting Emissivity Press FNto access the Adjust Emissivity display Adjusting Reflected Temperature Compensation Values Setting Alarm Limits Dag124f.bmp Adjusting Sleep Mode Ti20 Appendices Page Glossary Blackbody Display ResolutionCalibration Calibration SourceFocus Point or Distance Field of View FOVFull Scale Full Scale AccuracyLevel Optical ResolutionMicron or µm Minimum spot sizeResolution Reflected Temperature CompensationRelative Humidity RepeatabilityTemperature Storage Temperature RangeTemperature Coefficient or Ambient Derating Temperature ResolutionBasics of Infrared Measurement Why use non-contact infrared thermometers?How does IR work? What is emissivity? How to assure accurate temperature measurement?How to take temperature measurement? What is the distance to spot ratio?What are some uses for non-contact thermometers? Ti20 Typical Emissivity Values Table C-1. Emissivity Values for Metals Material To 14 µm Table C-1. Emissivity Values for Metals Material To14 µm Tin Unoxidized 0.3 Titanium Polished Typical Emissivity Values Ti20 Thermal SpecificationsOther