Armasight NAMPVS1401F9DA1 PVS14 FLAG MG Multi-Purpose Night Vision Monocular - Manual (Page 27)

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(9) The MUNVM must be able to resolve Group 3, Element 5, under high light conditions to pass the test.
If the monocular does 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. There-
fore, operational and cosmetic inspections must be done without the test set as specified in
paragraph 3.2.3.
(10) Look for flashing, flickering, or other nonstable behavior of the image intensifier. Also check the
image intensifier for other operational defects described in paragraph 3.2.3. To view the image intensi-
fier 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, send to a higher level of
maintenance for repair.
3.2.3. INSPECTION CRITERIA FOR PROPER IMAGE INTENSIFIER OPERATION
a. General
As directed in the Preventive Maintenance Checks and Services table, image intensifier operation must
be checked before each mission. This section provides information for the operator concerning what to
look for, how to look for it, and how to determine if the MUNVM should be returned to the maintainer.
CAUTION :
Perform the following inspection in the dark.
To perform this inspection, attach the monocular to the headmount as described in paragraph 3.3.7
and turn the power switch to the ON position. Look through the monocular and view the image.
There are two groups of “defects” you may encounter – operational defects and cosmetic blemishes. Opera-
tional defects are an immediate cause to reject the MUNVM. Cosmetic blemishes are not a cause for rejection
unless they become severe enough to interfere with the ability to perform the mission. The rejection of any
MUNVM for cosmetic defects must be based on an outdoor evaluation and not the TS-4348/UV Test
Set.
b. Operational Defects
These defects relate to the reliability of the image intensifier and are an indication of instability. If iden-
tified, they are an immediate cause for rejecting the MUNVM. They include shading, edge glow, flash-
ing, flickering, and intermittent operation.
(1) Shading. If shading is present, you will not see a fully circular image (see Figure 3-3). Shading is very dark
and you cannot see an image through it. Shading always begins on the edge and migrates inward eventually
across the entire image area. Shading is a high contrast area with a distinct line of demarcation. Return the
MUNVM to the maintainer.
SHADING
Figure 3-3. Shading