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Operation
MarathonSeriesFA/FR 27
Figure25:ModeSelectorButtonSequence(FRModels)
6.2.1TemperatureDisplay
Thetemperaturedisplaycanbesetforeither°Cor°FbypressingtheC/Fselectorbutton(c–up
arrow),which also doublesas the Increase Valuebutton forthe othermodes. TheDecreaseValue
(d – down arrow) button is inactive in this mode. A lit LED shows
you whether the measured
temperature is in °C or°F. Note that this setting influences the RS485 output for bothtarget and
internaltemperatures.
6.2.2Emissivity(1‐Color)
Youcansettheunitupforeither1‐coloror2‐colormeasurements.The1C/2Cselectorbuttononthe
controlpanelswitchesbetweenthetwofunctions.OneoftheredLEDs,labeled1Cand2C,willshow
whatfunctionisactive.
Theemissivityisacalculatedratioofinfraredenergy
emittedbyanobjecttotheenergyemittedbya
blackbodyat thesame temperature(aperfect radiatorhasan emissivity of1.00).Theemissivity is
presetat1.00.Forinformationondetermininganunknownemissivity,andforsampleemissivities,
refertosection
11.1DeterminationofEmissivityand11.2TypicalEmissivityValues,p.54f.
Tochangetheunit’semissivitysetting,completethefollowing:
1. Makesurethe1CLEDislit.
2. Press the Mode button until the Є LED is lit. The current emissivity value shows on the
display.
3. Pressthec ord buttontochangethevalue.
4. Pressthe
ModebuttonseveraltimesuntiltheCorFLEDislit.Thedisplayedtemperature
willnowbebasedonthenewemissivityvalue.
6.2.3Slope(2‐Color)
Theslopeisthequotientoftheemissivitiesbasedonthenarrowandthewidespectralrange(firstand
secondwavelength).Theslopeispresetatthefactoryat1.000.
Display/Change emissivity (1-color mode)
default: 1.00
Display/Change slope (2-color mode)
default: 1.000
Display current temperature Switches between °C and °F
Raises and lowers emissivity
or slope
Display/Change peak hold setting
default = 0 sec / off
Raises and lowers
peak hold timing
Display/Change averaging setting
default = 0 sec / off
Raises and lowers
averaging time