TM 9-2350-277-10
OPERATE AN/VAS-5 DRIVER'S VISION ENHANCER (DVE) (M58 ONLY) -- Continued
0035 02
NOTE
The SENSOR LEVEL control is non-functional on the commander's display.
6.
SENSOR LEVEL Control -- The SENSOR LEVEL control is a dual-action control. The two functions are automatic
and manual and are described as follows:
WARNING
The AUTO LEVEL and AUTO GAIN modes do not react instantly to rapidly changing scenery
(shade to sun, sun to shade). The AUTO LEVEL and AUTO GAIN modes require one or two
seconds to compensate. The automatic gain and level features will adjust faster than manual
adjustments. If necessary, slow or stop vehicle.
a.
AUTO LEVEL -- The AUTO LEVEL position provides the best image for most driving conditions. For AUTO
LEVEL mode, the control must be in the full counterclockwise detent position. In the AUTO position, the sensor
video brightness is adjusted automatically. In this position, the internal circuitry examines the INFRARED video
scene, determines the hottest and coldest extremes and centers the video level accordingly. The AUTO LEVEL
mode should normally be used while driving the vehicle.
b.
Manual LEVEL adjustment -- When the vehicle is stationary, in some viewing conditions it may be helpful to
adjust the SENSOR LEVEL control. Rotate the SENSOR LEVEL control clockwise out of detent position. Choose
a scene within DVEs FIELD OF VIEW (FOV). Adjust the SENSOR LEVEL control until the best image definition
is obtained. The optimum level setting varies with the scene and background. This manual operation should only
be used when the vehicle is stationary. It may be useful for viewing imagery having very high thermal difference
scenes, such as nearby vehicles, factories, or fires. It is also useful for viewing low thermal difference scenes, such
as featureless desert terrains or wet fields during or following a rain, where increased LEVEL control (using manual
operation) may improve detail resolution.
NOTE
The SENSOR GAIN control is non-functional on the commander's display.
7.
SENSOR GAIN Control -- The SENSOR GAIN control is a dual-action control. The two functions are automatic
and manual.
0035 02-5
Change 4
