EOTech LWTS Light Weapon Thermal Sight - Manual (Page 61)

2-43
SECTION V
OPERATION UNDER UNUSUAL CONDITIONS
2.27 SHUTTERLESS CALIBRATION
Shutterless calibrations are performed without the use of the
LWTS’ internal shutter and are silent. They are performed
with the objective lens cover installed and must, therefore,
be manually initiated.
NOTE
Failure to cover the objective lens prior to initiating
a shutterless calibration may result in a distorted
picture or the presence of ghost images in the
eyepiece display.
Shutterless calibrations are initiated by simultaneously
pressing the - sides of both the GAIN/EL and LVL/WND
rocker switches. A shutterless calibration may be manually
initiated any time the system menus are not displayed,
regardless of whether AUTO CAL ON or AUTO CAL OFF is
activated via the Main Menu (see section 2.19).
2.28 PBIT FAIL
The LWTS is equipped with Built-In Test (BIT) software that
continually queries internal components and circuitry to
ensure that the device is operating properly. If the BIT
software detects a problem, a System Failure Indicator
(PBIT FAIL) will be displayed in the upper left corner of the
eyepiece display as shown in Figure 2-35.