EOTech MTM Mini-Thermal Monocular - Manual (Page 36)

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2.9 CALIBRATION
After prolonged use, or after transitions from one
temperature extreme to another, a degradation of the
thermal image may be noticed. In these instances, and
during initial startup, the WTM should be calibrated to
optimize the viewed thermal image.
Calibration is accomplished by simultaneously pressing (and
holding) the UP / DOWN buttons, or via the system menu
(see section 2.16, Calibration (CAL)). Regardless of which
method is used, the objective lens cover must first be placed
over the objective lens. Failure to do so may result in a
distorted picture or the presence of ghost images in the
eyepiece display.
The WTM is equipped with an internal sensor that detects
significant changes in temperature. When this condition
occurs, the message “RECAL” will appear in the eyepiece
display indicating that the operator should calibrate the WTM
as described above.
2.10 DIOPTER ADJUSTMENT
The eyepiece may be focused to accommodate differences
in individual operators’ eyesight. Diopter adjustments may
be made as follows:
1. With the system powered on, press the PWR button to
call up the Main Menu.
2. While looking through the eyepiece display, rotate the
diopter adjuster until the menu text appears sharp and
clear.