PS Magazine - TB 43-PS-670
PS, The Preventative Maintenance Monthly
ISSUE 670
SEPTEMBER 2008
41
PS 670
SEP 08
I
f you order the MX-10130D/UV image intensiFer tube, NSN 5855-01-504-4589,
to use on your AN/PVS-7 night vision device, you may get a substitute. The substitute
is MX-10130C/UV, NSN 5855-01-380-5098.
The reason for the sub is the high demand for image intensiFer tubes. A lot of tubes
are being replaced because of direct, bright light damage.
Your image tube cannot recover from bright light damage. The pixels in the tube
will be damaged and leave a black, empty streak, an arc or spot.
While your night vision device is pretty smart by cutting off when exposed to
bright light, it’s not fast enough when exposed to extreme bright light, such as the
light emitted by tracers, lasers, and flares.
The
substitute
image
intensiFer
tube—the C tube—is identical to the D
tube with the tolerance of one additional
black spot. They work well and they
meet all the other requirements, but the
black spot standard has been reduced in
order to meet the supply need.
Most of the light damage to image
intensiFer tubes could be prevented if
the light interference Flter (LI±), NSN
5855-01-379-1410, was being used.
One reason may be that some of you don’t think you get as good an image with
the LI± in place. And you’re right. There is a slight reduction in system gain, but the
emphasis is on the word
slight
. If you’re getting too great a reduction, try cleaning
the LI± using water and lens paper, NSN 6640-01-459-4239. If it’s still a problem,
get a new LI±!
If the LI± is dirty or scratched or otherwise damaged, it could be you’re not using
the sacriFcial window, NSN 5855-01-246-8271. Use it! Its job is to give its life so
the LI± and the tube can survive.
Additionally,
some
of
you are removing the LI±
to attach things like the 3X
magniFer and the compass.
The magniFer, the compass,
the sacriFcial window and
the lens cap will all Ft into
the end of the objective lens
with the LI± in place.
Also, it is essential that
you use the objective lens
cap, NSN 5340-01-392-6608,
whenever the NVG is not in
use to protect the image tube
from exposure to sunlight.
AN/PVS-7 Night Vision Device…
Image Intensifier Tube Update
Yet, LIFs are
still
being
removed and not used.
what’s
up with
that!?
in the AN/PVS-
7
B and -
7
D
technical manuals,
TM 11-5855-262-10-2 and
TM 11-5855-262-23&P-2,
the instructions say,
‘‘The LIF is to be used
at all times.’’
This instruction is repeated
over and over and over
again in these manuals.
You can continue to
order the D tubes using
NSN 5855-01-504-4589.
but
be aware
that
you may get a mixture
of C tubes and D
tubes or all C tubes
in a shipment.
gah!
my NVD’s image
intensifer tube
is shot! but this
replacement has
a different NSN…
what’s up with
that?
it’s OK.
Lemme tell
you why…
Sacrifcial
window
LIF with container wrench
Objective
lens cap
670.40-41.indd
1-2
7/31/08
5:31:45 PM
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