ANSWER KEY AND FEEDBACK
Correct Answer and Feedback
A. Closed cycle.
Some infrared sights and devices have coolant cartridges to
cool the detectors, but the AN/TAS-4A has a closed cycle
cooler. (Page 2, Para. 2.)
B. Infrared passive.
The AN/TAS-4A Night Sight is a passive infrared system.
(Page 2, Para. 1.)
While there are some infrared devices that have short-
wavelength sensing systems, the AN/TAS-4A has a long-
D. To let the gunner choose field-of-view.
Depending upon terrain conditions and other considerations
the gunner may wish to view the target from narrow or wide
field-of-views. (Page 3, Figure 1-2.)
In the night sight the detectors are used to convert IR
energy to video signals. (Page 8, Figure 1-7.)
C. Cooler only.
The cooler is the only part of the night sight to have
power applied with the power ON/OFF/STBY switch in the
standby position. (Page 5, Figure 1-4.)