Operation
Marathon MR Rev. E2 04/2011 31
6.2 Operation Modes
When you first turn the unit on, the display shows the current temperature. Pushing the mode selector
button will change the figures on the display to the current setting for each particular mode. Figure 21
illustrates the sequence of operation for the mode selector button when in current temperature mode.
Figure 21: Mode Selector Button Sequence
6.2.1 Temperature Display
The temperature display can be set for either °C or °F by pressing the C/F selector button ( – up
arrow), which also doubles as the Increase Value button for the other modes. The Decrease Value
(– 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 both target and
internal temperatures.
6.2.2 Emissivity (1-Color)
You can set the unit up for either 1-color or 2-color measurements. The 1C/2C selector button on the
control panel switches between the two functions. One of the red LEDs, labeled 1C and 2C, will show
what function is active.
The emissivity is a calculated ratio of infrared energy emitted by an object to the energy emitted by a
blackbody at the same temperature (a perfect radiator has an emissivity of 1.00). The emissivity is
preset at 1.00. For information on determining an unknown emissivity, and for sample emissivities,
refer to section 11.1 Determination of Emissivity and 11.2 Typical Emissivity Values, p. 54f.
To change the unit’s emissivity setting, complete the following:
1. Make sure the 1C LED is lit.
2. Press the Mode button until the Є LED is lit. The current emissivity value shows on the
display.
3. Press the or button to change the value.
4. Press the Mode button several times until the C or F LED is lit. The displayed temperature
will now be based on the new emissivity value.
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