The following steps are required to place the MK
37 NVS in operation:
1. Place the power switch in the ON position.
2. Press your eye against the monocular lens
eyeshield flap and view the image, or view the
image with both eyes through the binocular
3. Adjust the diopter ring to create a sharp reticle
4. Adjust the focus ring for a clear image of the
The AN/PVS-8 (fig. 2-17) is a portable,
shipboard-mounted, battery-operated NVS used for
long-range surveillance. The unit uses the mounting
system common to the Mk 37 NVS. An eye shield is
used to prevent the visible light emitted from the
eyepiece from being externally visible on the
operator's face. Power is provided by two 1.5V AA
batteries with a life of 60 hours. Magnification of the
unit is 6.2X with a 4.7-degree field of view. As with
other NVSs, an internal image intensifier tube
amplifies available light such as moonlight, starlight,
and skyglow, so the scene becomes visible to the
operator. An automatic brightness control is provided
to automatically maintain the viewed scene
illumination contrast during periods of changing light
level conditions. The manual gain control (tube
brightness) will not function when the automatic
brightness control is in operation. The image
Figure 2-17.AN/PVS-8 long range night vision sight.
intensifier tube also has protection from
high-intensity, short-duration flashes of light.
Setup and operation of the AN/PVS-8 is similar to
the Mk 37; actions required prior to installation are as
1. Relieve air pressure inside the carrying case by
pressing the core of the relief valve, before
releasing the latches.
2. Release all case latches and remove the cover.
3. Inventory and inspect the contents to ensure
they are ready for installation.
Setup of the NVS consists of mounting the sight
on the appropriate operational location and installing
the batteries. Remove the NVS from the storage case.
Secure the pintle in the bracket and locking assembly.
Rotate the TUBE BRIGHTNESS control switch fully
counterclockwise to the OFF position. Insert the
batteries and replace the battery cap. The sight is now
ready for operation.
Do not leave the batteries in the equip-
ment during storage, or corrosive
damage may result.
Do not remove the cover in daylight.
The following steps are required to place the
AN/PVS in operation:
1. Rotate the TUBE BRIGHTNESS control
clockwise to turn on the NVS.
2. Press your face against the eyeguard and view
3. Adjust the TUBE BRIGHTNESS control to the
setting that provides good target to background
4. Adjust the range focus ring for a clear image of
the object desired.
Now that you have the sights operational, you
must learn scanning procedures. A well-trained
operator will see more than an inexperienced one.
Targets that are readily identifiable by a trained
observer will invariably escape detection by the