PS Magazine - TB 43-PS-634
PS, The Preventative Maintenance Monthly
ISSUE 634
SEPTEMBER 2005
Brush the demist shield clean with
lens paper like you’d sweep a floor. If
you can’t get it clean, turn it in to your
C & E shop for a new shield.
While you’re cleaning the lens,
don’t forget the sacrificial window and
the light interference filter. Sacrificial
windows will get dirty in the field
because they’re used during adverse
conditions—such as sand or dust— to
protect the lens. Use wet lens paper to
do the cleaning job.
Light interference filters should be
cleaned with lens paper and water.
PS 634
SEP 05
44
Night Vision Devices…
Lend a
Hand to
Lenses
C
leaning the lens on a night vision device (NVD) is the user’s responsibility. But
many of you are taking that responsibility too lightly.
Clean the lens with lens paper,
NSN 6640-01-459-4239, and water.
This is the
only
lens paper that can
be used either wet or dry. Never
clean the lens when it’s dry! Dirt
pushed across a dry lens will
scratch it. In a pinch, you can use
your hot breath to create moisture
on the lens. But don’t do this in cold
weather. Warm moisture hitting the
cold glass could crack the lens.
If you’re cleaning the lens
demist shield, dry is the way to go.
The demist shield is coated to pre-
vent the lens from fogging. If you
clean the shield using water or your
breath, you’ll damage the coating.
Brush demist shield…
…and sacrifical
window clean
use your
breath
on the
lens…
…but
in warm
weather
only!
you’ll
damage my
coating!
When the NVD is not in
use, make sure to keep
on the lens cap.
Dirt buildup and
scratches happen only
to
uncovered
lenses.
check out
this chart
to see
which
lens cap
protects
your
nvg.
oh, man!
is this
lens
dirty!
I gotta
clean it!
hey! you can’t
clean me
dry.
use your breath
to fog me up,
but first…
…please take
this
mint!
Don’t
use
your breath
on the
demist
shield!!
instead,
get a
new
demist
shield.
if your lens is
fogging,
don’t
try any home-
made remedies–
like toothpaste—
to coat it.
Eyepiece Cap NSN
(Eyecups)
(Eyecups)
NVD
AN/AVS-6-series
AN/PVS-7A
AN/PVS-7B or -7D
AN/PVS-10-series
AN/PVS-14
Objective Cap NSN
634.44-45(C).qxd
7/29/05
11:46 AM
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