Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 61)

2-26
NOTE
For a pattern to be resolvable, three vertical bars
and three horizontal bars must be visible.
(8) Flip the HIGH/LOW switch to the HIGH position.
(9) Again, look through the goggles and view the projected
pattern (see Figure 2-2). If necessary, refocus the objective lens
and then the eyepiece lenses to obtain the sharpest image.
(10) The NVG must be able to resolve Group 3, Element 5,
under highlight conditions to pass the test. If the goggles do not
pass the test, send it to a higher level of maintenance for repair.
NOTE
When using the TS-4348/UV test set, you are not
viewing the entire image intensifier. Therefore,
operational and cosmetic inspections must be
done without the test set as specified in paragraph
2-4.
(11) Look for flashing, flickering, or other nonstable behavior
of the image intensifier. Also check the image intensifier for other
operational defects described in paragraph 2-4. To view the image
intensifier under low light conditions, flip the HIGH/LOW switch to
the LOW position and allow your eyes to become accustomed to
the dark. If any unacceptable conditions are noted, return the
goggles to maintenance.