PVS7 Manual

GENERAL INFORMATION

1-1 SCOPE

This manual provides operation and maintenance instructions for the PVS-7 Night Vision Goggle (which shall be designated a goggle or PVS-7 throughout this manual). The PVS-7 is a self-contained night vision device that enables improved night vision using ambient light from the night sky (moon, stars, sky glow, etc.).

1-2 REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)

Reports from the user on recommendations for improvements are encouraged. Send reports to the address below:

American Technologies Network Corp.
1341 San Mateo Avenue
South San Francisco, CA 94080
800-910-2862
650-989-5100
(650) 875-0129 fax
www.atncorp.com
info@atncorp.com

1-3 GLOSSARY

Black Spots. These are cosmetic blemishes in the image intensifier of the PVS-7 or dirt or debris between the lenses.

Bright Spots. These can be defects in the image area produced by the PVS-7. This condition is caused by a flaw in the film on the micro-channel plate. A bright spot is a small, non-uniform, bright area that may flicker or appear constant. Bright spots usually go away when the light is blocked out and are cosmetic blemishes that are signal induced.

Browpads. Three hook-and-pile browpads are provided to adjust the head mount to fit different head sizes. The thin brow pad (fits on a large head) comes attached to the head mount and the thick or medium (fits on a smaller head) brow pads are stored in the carrying case.

Chicken Wire. An irregular pattern of dark thin lines in the field of view either throughout the image area or in parts of the image area. Under the worst-case condition, these lines will form hexagonal or square wave-shaped lines.

Dark (or Dark Area). A place in which there is very little light. It does not mean total darkness. Generally, this means conditions similar to a quarter-moon or starlit night.

Demist Shields. The two demisting shields are used to prevent the eyepiece lenses from becoming fogged.

Diopter. A unit of measure used to define eye correction. Adjustments to the eyepiece focus ring will change diopter and provide a clearer image.

Edge Glow. There is a defect in the image area of the PVS-7. Edge glow is a bright area (sometimes sparkling) in the outer portion of the viewing area.

Emission Point. A steady or fluctuating pinpoint of bright light in the image area that does not go away when all light is blocked from the objective lens. The position of an emission point within the image area does not move. An emission point should not be confused with a point light source in the distance.

Fixed-Pattern Noise. This is a cosmetic blemish in the image area characterized by a faint hexagonal (honeycomb) pattern throughout the viewing area that most often occurs at high light levels or when viewing very bright lights. Fixed-pattern noise is inherent in the structure of the fiber optics and can be seen in every image intensifier if the light level is high enough.

Flashing. This is a defect in the image area of the PVS-7. The image appears to flicker or flash.

Flickering. See "Flashing".

Image-Intensifier Assembly. An electro-optical device that detects and amplifies ambient light to produce a visual image.

Infinity Focus. Adjustment of the objective lens so that a distant object, such as a star or the point light on a distant tower, forms the sharpest image.

Intermittent Operation. This is a defect in the image area of the PVS-7. See "Flashing".

Light Interference Filter (LIF). This is a tear-protection filter for the goggle. Use of this filter will result in a slight reduction in system gain.

Microchannel Plate. A current-multiplying optical disk that intensifies the electron image produced by the photocathode.

Photocathode. The input optic of an image intensifier that absorbs light energy and in turn releases electrical energy in the form of an electron image.

Sacrificial Window. A replaceable sacrificial window is supplied to protect the objective lens assembly during operation in adverse conditions.

Scintillation. A faint, random, sparkling effect throughout the image area. Scintillation is a normal characteristic of the image intensifier assembly and should not be confused with emission points. Scintillation is more pronounced under low-light conditions. Also called "video noise".

Shading. The viewed image should be a full circle. If shading is present, you will not see a fully circular image. Shading is indicative of a dying photocathode and is caused by a defective vacuum seal of the image intensifier. Shading is very dark and you cannot see an image through it.

1-4 ADMINISTRATIVE STOWAGE

Administrative stowage of equipment should be done in the factory-supplied container and after a thorough PMCS as outlined in Chapter 3 of this manual. This will ensure the PVS-7 remains in a mission-ready condition during storage.

1-5 WARRANTY INFORMATION

This item shall conform to design, manufacturing, and performance requirements and be free from defects in material and workmanship for a period of two (2) years from the date of acceptance. If item is defective, notify ATN or point of purchase contact.

EQUIPMENT DESCRIPTION

1-5 EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES

The PVS-7 includes the items shown in Figure 1-1. See Table 1-1 and Figure 1-1 for standard and optional equipment.

A. Goggle Assembly. The goggle assembly consists of four primary sub-assemblies: a simple objective lens, a wired housing assembly, an image intensifier tube (IIT) assembly (not shown) and a rear cover assembly. The wired housing assembly contains a built-in battery compartment, attached battery cap and the RESET/OFF-ON-IR/PULL switch.

B. Head Mount Assembly. The adjustable, cushioned head mount assembly secures the goggle to the operator's head for night viewing, providing freehand support for use with a weapon, protective mask or other purposes. The thin brow pad (used for larger heads) comes attached to the head mount and the thick or medium brow pads (for smaller heads) are stored in the carrying case.

C. Carrying Case. The canvas carrying case is provided for transportation and protection of the PVS-7, head mount assembly, batteries and accessories. Two slide keepers are provided for belt attachment. A carrying case strap is also provided which can be attached to the two D-rings on the back of the carrying case. The case has a zipper closure.

D. Demist Shields. The two demist shields are used to prevent the eyepiece lenses from becoming fogged.

E. Sacrificial Window. A replaceable sacrificial window is supplied to protect the objective lens during operation in adverse conditions.

F. IR Spot/Flood Lens. This item focuses the IR light for a narrow beam (spot) or wide-angle (flood) beam illumination.

G. Compass. This item enables the operator to see azimuth readings in the goggle's illuminated viewing area.

H. Neck Cord. This additional authorized item enables the user to attach the compass or 3X magnifier lens to his/her person to guard against dropping or losing these items.

I. Optional Equipment. Optional equipment includes demist shields, sacrificial window, light interference filter (LIF), compass, helmet mount assembly and an IR spot/flood lens. Also included is a shipping and storage case. The PVS-7 may be supplied in a hard shipping and storage case. Batteries may also be stored in the shipping and storage case.

Item	Description	Part No.
1	Head mount assembly	ATN3144268
2	Thin brow pad	ATN3144280
3*	Compass	ATN3187430
4	Medium brow pad	ATN3144435
5	Large brow pad	ATN3144436
6	Operator's manual	PVS-OM-007
7	Lens paper (not shown)	-
8	Shoulder strap assembly	ATN3144267
9	Light interference filter	ATN5009737
10	Sacrificial window	ATN3144264
11*	IR spot/flood lens	ATN3187441
12*	BA-5567/U lithium battery
13	Demist shield assembly	ATN31442632
14	PVS-7 assembly	ATN-PVS7-001
15	AA alkaline batteries
16	Carrying case	ATN3187392
17*	Helmet mount assembly	ATN3256390
18	Neck cord	ATN3260933
19*	Shipping/storage case (not shown)	ATN3187393

* Optional equipment or equipment having variants.

1-6 EQUIPMENT CAPABILITIES

The PVS-7 is a hand-held, head-mounted or helmet-mounted night vision system that enables walking, driving, weapon firing, short-range surveillance, map reading, vehicle maintenance and administering first aid in both moonlight and starlight. Each unit allows for vertical adjustment (by using head straps), fore-and-aft adjustment, objective lens focus, eyepiece focus and eye relief distance adjustment. The goggle is also equipped with an infrared (IR) light-emitting diode (or illuminator) and a low battery LED indicator. The goggle automatically shuts off when disconnected from the head mount or helmet mount or flipped up on the helmet mount. There is also a high light cutoff feature that shuts off power to the goggle when it is exposed to high levels of light for 70 (±30) seconds.

1-7 SPECIFICATIONS

The following tables provide information pertaining to the operational, electrical, mechanical, optical and environmental characteristics for the goggle.

Table 1-2. Operator Adjustment Limits
Interpupillary Distance	55 to 71 mm
Diopter Focus	+2 to -6 diopters
Objective Focus	25 cm to infinity

Table 1-3. Electrical Data
Power Source	Battery (3 VDC max.)
Battery Requirements	2 AA alkaline or 1 lithium (BA-5567/U)

Table 1-4. Mechanical Data
Shipping and Storage Case	Approx. 17" x 12" x 7"; weight: 6.7 lbs.
Soft Carrying Case	Approx. 14" x 8"
Goggle Weight	1.5 lbs.

NOTE:
The weight of the PVS-7 does not include accessories.

Table 1-5. Optical Data
Magnification	1.0X
Field of View	40°
Eyepiece Focus	+2 to -6 diopters
Focus Range	25 cm (9.8") to infinity

Table 1-6. Environmental Data
Operating Temperature	-40°C to +50°C
Storage Temperature	-50°C to +70°C
Illumination Required	Overcast starlight to moonlight
Waterproof	1 meter for 30 min.

OPERATION PRINCIPLES

1-8 MECHANICAL FUNCTIONS

Mechanical adjustments of the PVS-7 allow for physical differences between individual operators using the system. The goggle's functions include the power switch, interpupillary adjustment, release latch, eye relief adjustment, diopter adjustment, IR spot/flood focus (optional), compass illumination (optional), and objective lens focus.

1-9 OPTICAL AND ELECTRICAL FUNCTIONS

The optical functions include an objective lens, image intensifier, a collimator lens and two eyepieces. The objective lens collects light reflected from the night scene by the moon, stars or night sky and inverts the image and focuses that image on the image intensifier.

A. Power Source. The electronic circuit is powered by replaceable batteries - either a 3.0 Volt lithium battery (BA-5567/U) or two AA 1.5 Volt alkaline batteries (BA-3058/U).

B. Electrical Principles. Power from the batteries is supplied to the components through the RESET/OFF-ON-IR/PULL switch as follows:

• RESET/OFF position. With the switch in the OFF position, the circuit is not energized either to the image intensifier or the IR illuminator. Also, turn the switch to this position to reset after automatic shutoff or high light cutoff.
• ON position. Power is drawn from the battery compartment to energize the goggle. When the voltage drops to 2.4 VDC, a low battery indicator at the right eyepiece blinks, indicating approximately 30 minutes of operating time.
• IR/PULL position. Power is drawn from the battery compartment to energize the goggle and IR light source and a steady red indicator light in the left eyepiece. The IR is momentarily turned on by turning the switch past ON without pulling the knob.

C. Automatic Shutoff. When the goggle is removed from the head mount or helmet mount while in operation, it will automatically shut off. This prevents enemy detection of the green glow of the image intensifier. To turn the goggle back on, turn the switch to RESET/OFF and then to ON again.

D. High Light Cutoff. The goggle will automatically shut off after 70 (±30) seconds of operation in daylight or bright room light. Individual bright lights (headlights, flashlights or other concentrated light sources) will not actuate the high light cutoff function unless focused directly on the high light detector located on the front of the goggle. To turn the goggle back on, turn the switch to RESET/OFF position and then to ON again.

1-10 CONSUMABLE ITEMS

Items listed in Table 1-7 are recommended for operator maintenance.

Item	Limits
Lens paper	-
Cotton swabs	-
Alcohol	-

OPERATING PROCEDURES

2-1 GENERAL

This section contains instructions for placing the PVS-7 in operation and to operate it under normal conditions. The function of controls and indicators is explained.

CAUTION:
THE PVS-7 IS A PRECISION ELECTRO-OPTICAL INSTRUMENT AND MUST BE HANDLED CAREFULLY AT ALL TIMES.

2-2 CONTROLS AND INDICATORS

The PVS-7 is designed to adjust for different users and corrects for most differences in eyesight. The controls and indicators for the PVS-7 are shown or described in Figure 2-1 and Table 2-1.

Item	Control / Indicator	Function
1	RESET/OFF-ON-IR/PULL	Controls goggle and IR light power. RESET/OFF: Same as system OFF. Also resets goggle after automatic shutoff or highlight cutoff. ON: Goggle activated. IR/PULL: Pull switch out and turn clockwise to activate goggle and IR. Illuminates LED indicator in left eyepiece.
2	RESET/OFF-ON-IR/PULL label	Defines the switch positions.
3	IR spot/flood lens	Focuses the IR light for a narrow beam (spot) or wide-angle (flood) beam illumination.
4	Compass illuminator button	Pressing this button activates the compass illuminator LED, which makes compass readings visible in the goggle viewing area. Additional pressure will make the image brighter. The image disappears when the button is released.
5	Objective focus	Focuses objective lens. Adjusts for sharpest image of viewed object.
6	Battery polarity indicator	This feature, molded into the PVS-7, shows the proper orientation of the batteries.
7	Latch	Used for separation of goggle assembly from head mount/helmet mount assembly.
8	LED ON indicator (not shown)	When illuminated in the left eyepiece, it indicates that the IR illumination is on.
9	Low battery indicator (not shown)	When illuminated in the right eyepiece, it indicates a low battery condition with less than 30 minutes of battery life remaining.
10	Diopter adjustment ring	Focuses eyepiece lens for each eye without the need for glasses. Adjusts for sharper image of intensifier screen.
11	Interpupillary adjustment	Adjusts for distance between eyes by sliding the eyepieces either together or apart so each eye can observe the entire field at the same time.
12	Eye relief	Adjusts the distance between your eyes and the goggle.

NOTE:
Some PVS-7 units contain an additional momentary IR function. For momentary IR, continue to turn the switch knob clockwise, past ON and without pulling. The switch will return to the ON position when released.

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

2-3 PURPOSE OF PMCS

PMCS is performed daily when the PVS-7 is in use to ensure that the sight is ready at all times. Procedures are a systematic inspection of the goggle that will enable you to discover defects that might cause the PVS-7 to fail on a mission.

2-4 FREQUENCY OF PERFORMING PMCS

• Daily when the PVS-7 is in use.
• Weekly when in a standby condition.
• Semi-annually when stored in depot or administrative stowage.

2-5 PERFORMANCE OF PMCS

Preventive maintenance checks and services shall be performed following the sequence and inspection procedures indicated in Table 2-2.

Item	Inspection / Procedure
1	Goggle - Check for completeness, including accessories. Check for dirt and moisture on external surfaces and parts. Clean and dry with lint-free cloth.
2	Shipping case - Check for dirt, moisture and mildew. Clean with mild detergent and water. Dry with lint-free cloth.
3	Carrying case - Check for dirt, moisture and mildew. Clean with mild detergent and water. Dry with lint-free cloth.
4	Batteries - Remove batteries. Check for corrosion on terminals and dirt or moisture in battery cap. Clean battery cap with dry cloth. Replace batteries if corroded.
5	Lenses - Check for dirt and moisture. Clean with lens paper or brush and/or alcohol and cotton swabs.
6	Eyecups - Check for dirt, dust, cracked or torn cups. Inspect for bent, broken or improperly fitting eyecup.
7	Interpupillary adjustment - Slide each eyepiece back and forth to check for binding or looseness.
8	Objective lens focus knob - Rotate objective lens focus knob to ensure free movement (range is approximately 1/3 turn).
9	Neck cord and lens cap - Check for cracked, torn or missing lens cap. Inspect cord for cuts, damage or frayed ends. Re-tie ends if necessary.
10	Latch - Inspect for damage.
11	RESET/OFF-ON-IR/PULL switch - Remove any batteries and turn the switch from RESET/OFF to ON or IR/PULL. Each position should have a definite stopping point. Inspect for broken or missing knob.
12	Head mount straps and pads - Check for cuts, tears, fraying, holes, cracks or defective fasteners.
13	Head mount socket - Check for dirt, dust or corrosion. Insert goggle latch into socket to verify secure attachment of goggle to head mount. If necessary, clean socket with water.
14	Fore-and-aft adjustment - Press the socket-release button and check for free motion. Inspect for damage.
15	Optional helmet mount straps - Inspect for cuts, tears, fraying, holes, cracks or defective fasteners.
16	Optional helmet mount socket - Check for dirt, dust or corrosion. Insert goggle latch into socket to verify secure attachment of goggle to helmet mount. If necessary, clean socket with water.
17	Optional helmet mount fore-and-aft adjustment - Press the socket-release button and check for free motion. Inspect for damage.
18	Flip-up / auto off - With goggle on, flip up and verify auto-off function operation.
19	Tilt adjustment - Verify knob locks tilt in place and full range of tilt is available with knob loosened.
20	Soft carrying case - Remove all items and shake out loose dirt or foreign material. Inspect for tears, cuts, excess wear or damage to mounting clips.
21	Shoulder strap assembly - Inspect for cuts, tears or excess wear of damaged clips.
22	Demist shields - Inspect for dirt, dust, scratches or damage. If necessary, clean when shields are dry and with dry lens paper only.
23	Light interference filter (LIF) - Inspect for dirt, dust, scratches or damage. If necessary, clean with water and dry with lens paper.
24	IR spot/flood lens - Rotate IR focus lens to ensure free movement.
25	Compass assembly - Inspect for dirt, dust, scratches or damage. If necessary, clean with water and dry with lens paper. Install compass assembly and turn on goggle. When the illumination button is depressed, the compass should be visible.
26	3X/5X afocal magnifier lens - Check lens for scratches or damage. Check mating to objective lens by screwing in or pressing on with adapter installed.

NOTE:
Damaged optional items (compass, IR spot/flood, sacrificial window, demist shields) do not cause the entire end item to be "not fully mission capable". However, the damaged item should be replaced as soon as practical to restore full capability of the system.

ASSEMBLY AND PREPARATION

2-6 PREPARATION FOR USE

This chapter contains the information necessary to prepare the goggle for operation. This includes unpacking, examination for goggle damage, battery installation, sacrificial window installation and head mount installation and adjustments.

A. Unpacking

CAUTION:
RELIEVE AIR PRESSURE INSIDE SHIPPING AND STORAGE CASE BY PRESSING RELIEF VALVE BUTTON LOCATED NEAR THE CARRYING CASE HANDLE BEFORE RELEASING LATCHES.

1. Release the two latches securing top of shipping and storage case and open top.
2. Check contents of shipping and storage case for completeness.
3. Remove the carrying case from the shipping and storage case. Open carrying case, remove the PVS-7 and check contents for completeness.
4. Inspect the goggle for obvious evidence of damage to optical surfaces, body, eyecups, RESET/OFF-ON-IR/PULL switch, battery cap, etc. Ensure that all optical surfaces are clean and ready for use. Clean with lens paper.

B. Installation of Batteries

CAUTION:
TO PROTECT THE IMAGE INTENSIFIER, KEEP THE LENS CAP ON THE OBJECTIVE LENS WHEN THE GOGGLE IS NOT IN USE OR WHEN CHECKED OUT IN DAYLIGHT CONDITIONS. NOTE:
Operation of the PVS-7 under daylight conditions will activate the high light cut off in 70 (±30) seconds, causing the goggle to shutdown. WARNING:
THE LITHIUM BATTERY CONTAINS SULFUR DIOXIDE GAS UNDER PRESSURE.
DO NOT HEAT, PUNCTURE, DISASSEMBLE, SHORT CIRCUIT, ATTEMPT TO RECHARGE OR OTHERWISE TAMPER WITH THE BATTERIES.
TURN OFF EQUIPMENT IF BATTERY COMPARTMENT BECOMES UNDULY HOT. IF POSSIBLE, WAIT UNTIL THE BATTERIES HAVE COOLED BEFORE REMOVING THEM.
BATTERIES HAVE SAFETY VENTS TO PREVENT EXPLOSION. WHEN THEY ARE VENTING GAS, YOU WILL SMELL IT (VERY IRRITATING) OR HEAR THE SOUND OF GAS ESCAPING. WHEN THE SAFETY VENTS HAVE OPERATED, THE BATTERIES ARE FAIRLY SAFE FROM BURSTING, BUT STILL MUST BE HANDLED WITH EXTREME CARE BECAUSE OF HEAT.
IF YOU INHALE SULFUR DIOXIDE, SEEK MEDICAL ATTENTION.

The PVS-7 will operate with either of the two battery types identified in Table 2-3. Batteries are not supplied with the PVS-7 and must be obtained.

Battery Type	Negligible IR Usage	10% IR Usage of the Time
Lithium (BA-5567/U)	47-85 Hours	36-65 Hours
AA alkaline (BA-3058/U)	89-160 Hours	68-123 Hours

NOTE:
The battery data in Table 2-3 represents operation under room temperature. When operating under cooler conditions, battery life will decrease. CAUTION:
MAKE CERTAIN THE RESET/OFF-ON-IR/PULL SWITCH IS IN THE OFF POSITION BEFORE INSTALLING BATTERIES.

Install either two (2) AA batteries or one (1) BA-5567/U lithium battery as follows. Do not attempt to mix battery types in the compartment.

1. Remove the battery cap by turning it counterclockwise.
2. Check to ensure the O-ring is present. If not, replace it.
3. Observe polarity, as indicated on the outside of the battery compartment, and insert either two AA 1.5 Volt batteries or one 3.0 Volt BA-5567/U lithium battery into the battery compartment, plus (+) end first.
4. Replace battery cap by pushing and turning it clockwise. Tighten it firmly to ensure a watertight seal.

C. Installation of the Eyecups

1. Carefully press each eyecup over the diopter cell retainer.
2. Rotate each eyecup into proper viewing position. Adjust for best eye fit. The eyecups must seal around your eyes and prevent the green glow from escaping.

D. Installation of the Demist Shields

CAUTION:
IF THE DEMISTING SHIELDS NEED TO BE CLEANED, MAKE SURE THE SHIELDS ARE DRY AND USE DRY LENS PAPER. IF THE DEMIST SHIELDS ARE WIPED WHILE WET OR WITH WET LENS PAPER, YOU WILL DAMAGE THE COATING. NOTE:
If inclement operating conditions are known to exist (for example, significant temperature change and high humidity), install the demist shields to minimize diopter lens fog prior to execution of mission.

1. Carefully remove the eyecups.
2. Carefully press a demist shield onto each eyepiece. Be careful not to smudge the eyepieces or demist shields.
3. Replace the eyecups.

E. Installation of the Sacrificial Window

CAUTION:
IF ADVERSE OPERATING CONDITIONS (DUST OR SAND) ARE KNOWN TO EXIST, ATTACH THE SACRIFICIAL WINDOW TO PROTECT THE OBJECTIVE LENS FROM SCRATCHES OR OTHER DAMAGE.

1. If the compass assembly or lens cap is in place, remove it.
2. Carefully push the sacrificial window over the objective lens until it stops. Turn the sacrificial window clockwise until it snaps into place.

F. Installation of the Compass Assembly

NOTE:
a. Prepare the PVS-7 for operation.
b. Leave LIF in place when installing the compass assembly.
c. Ensure the neck cord is secured to the compass and clothing before installing.

1. If the sacrificial window or lens cap is in place, remove it.
2. Turn the PVS-7 on.
3. Rotate the objective lens focus completely counterclockwise while looking through the goggle.
4. Press the compass assembly onto the objective lens at an angle using your left hand. Slowly turn the compass assembly counterclockwise until it is in the vertical position, with compass illumination button pointing down.
5. Ensure that the compass fits tightly to the PVS-7.

NOTE:
The O-ring must be in place in the compass assembly in order for the compass to fit properly.

G. Installation of the Light Interference Filter

1. Remove the container/wrench from the carrying case pouch.
2. If the lens cap, compass assembly, or sacrificial window is on the objective lens of the PVS-7, remove it.
3. Carefully open the container/wrench and remove the LIF.
4. Hold the LIF by the notched end and thread it clockwise into the end of the objective lens.
5. Using the ridged side of the container/wrench as a wrench, engage the ridges on the container with the ridges on the LIF and tighten the LIF hand tight.
6. Place the empty container/wrench back into the pouch in the carrying case.
7. Replace the lens cap or the sacrificial window onto the end of the objective lens and over the LIF.

CAUTION:
BE CAREFUL NOT TO TOUCH THE GLASS SURFACES. IF YOU GET FINGERPRINTS OR CONTAMINATION ON THE GLASS SURFACES, USE LENS PAPER TO CLEAN THE LIF. IF MOISTURE IS NEEDED, USE YOUR BREATH TO MIST THE SURFACE OF THE GLASS.
DO NOT OVER-TIGHTEN THE LIF INTO THE OBJECTIVE LENS. NOTE:
The lens cap, compass assembly, or the sacrificial window will fit onto the end of the objective lens with the LIF in place.

H. Installation of the IR Spot/Flood Lens

1. Press the IR spot/flood lens over the IR source until it is tight against the goggle.

I. Installation and Adjustment of the Head Mount Assembly

NOTE:
Do not don the head mount while the PVS-7 is attached to it.

1. Prior to donning the head mount, loosen the four chin straps so the ends of each strap are approximately two inches from the sliding bar buckles.
2. Snap the front and rear snaps in place.
3. With both hands, grasp the neck pad assembly and pull the harness over your head and the neck pad down to the back of your neck.
4. Holding the chin cup in position on chin, adjust both rear chin cup assembly straps until you feel light pressure against your chin. Do not tighten.
5. Maintain the position of the chin cup and remove any slack from the front and rear chin straps. Do not tighten.
6. Ensure that the cross-strap assembly is not twisted and remove slack by adjusting the vertical adjustment strap at the neck pad.
7. Adjust chin strap and vertical adjustment until the chin cup and headband assembly are in a comfortable but firm position.
8. Refer to paragraph 2-8, A for operating procedures of head mount assembly.

NOTE:
If the head mount is too loose, remove the attached thin brow pad and replace with either the medium or large brow pad stored in the carrying case. NOTE:
After installing the PVS-7, minor strap adjustments may be necessary to achieve comfort.

J. Installation of Head Mount Assembly with Protective Mask

1. Place protective mask on your head per the instructions provided with the mask.
2. Install the head mount assembly per instructions above.

WARNING:
WHEN INSTALLING THE HEAD MOUNT OVER THE PROTECTIVE MASK, BE CAREFUL NOT TO BREAK THE PROTECTIVE MASK SEAL AROUND YOUR FACE. NOTE:
It may be necessary to remove the brow pad when wearing the head mount over a protective mask.

K. Installation of the Head Mount Assembly with the PASGT Helmet

Install the head mount assembly per the instructions in paragraph 2-6, I.

L. Installation of the Head Mount Assembly with the M1 Helmet

Install the head mount assembly per the instructions in paragraph 2-6, I.

M. Installation of the Helmet Mount Assembly (Optional) to the PASGT Helmet

1. Remove mount assembly from the carrying case.
2. With the catch in forward most position, place the strap over the top of the helmet, center and hook the rear bracket onto the rear of the helmet. Center the front bracket, hook it on the front of the helmet and hold it in place.
3. With the buckle-lever open, take up the slack in the strap using catch. Close the buckle lever.
4. Place the helmet upside down with the helmet mount facing you.
5. Thread the chinstrap through the right end of nape strap and snap nape strap fastener tab closed.
6. Thread chin strap through the left end of nape strap and snap nape strap fastener tab closed.
7. Disengage the nape strap latch on the left side of the nape strap.
8. Don the helmet.
9. Engage the nape strap at the nape strap latch. Tension the chinstrap and nape strap for a secure and stable fit. The brow of the helmet should be parallel with the ground.

NOTE:
Steps 5 and 6 describe the installation of the nape strap to the chinstrap. To accomplish these steps, it may be necessary to unthread the chinstrap from the helmet.

INSTALLATION OF THE QUICK DISCONNECT HELMET MOUNT ASSEMBLY

CAUTION:
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, REMOVE BOTH THE GOGGLES AND THE MOUNT ASSEMBLY FROM THE HELMET WHEN NOT REQUIRED FOR IMMEDIATE USE. THE CLIP/STRAP ASSEMBLY CAN REMAIN IN PLACE ON THE HELMET.

1. Remove the helmet mount assembly from the carrying case. Make sure the helmet mount is complete.
2. If the mount assembly and clip/strap assembly are connected, remove the mount assembly. To do this, push the release lever at the top center of the mount and slide the two assemblies apart.
3. Adjust the clip/strap assembly to fit the helmet size being used.
4. With the catch in the most extended position, place the strap over the top of the helmet, center and hook the rear bracket onto the rear of the helmet. Center the front bracket hook on the front of the helmet and hold it in place.
5. With the buckle lever open, take up the slack in the clip/strap assembly using the catch. Close the buckle lever.
6. If the PASGT helmet has its cloth cover and camouflage strap installed, slide the camouflage strap up at about a 30°-45° angle at the front of the helmet.
7. Disengage the nape strap latch on the left side of the nape strap.
8. Don the helmet. Do not fasten the helmet chinstrap.
9. Engage the nape strap at the nape strap latch. Tension the nape strap for a stable fit, then install and tension the helmet chinstrap. The brow of the helmet should be parallel to the ground and the helmet stable on the head.
10. To install the mount assembly into the clip/strap assembly, place its top flange into the top groove of the mounting clip and then press the mount assembly bottom until it locks into place with a click.

PVS-7 OPERATION

2-8 OPERATING PROCEDURES

A. Head Mounted Operation

CAUTION:
OPERATE THE PVS-7 ONLY UNDER DARKENED CONDITIONS OR USE THE LENS CAP TO COVER THE OBJECTIVE LENS FOR DAYLIGHT CONDITIONS. NOTE:
Proper objective focus cannot be obtained while the objective lens cap with pinhole is covering the objective lens. Proper objective focus must be done in the dark with the objective lens cover removed.

1. Ensure that the batteries are installed.
2. Don the head mount.
3. To make it easier to align the goggle, eyecups and diopter eyepieces to the eyes, depress the socket-release button and slide the head mount socket all the way forward before attaching the goggles.
4. Align the PVS-7 latch to the head mount socket. Press and hold down the latch lever while installing the goggle into the head mount socket. Release the latch when the goggle is fully engaged in the socket.
5. Set your eye relief by depressing the socket-release button and move the PVS-7 back toward your eyes until the eyecups comfortably seal around your eyes.
6. Turn the RESET/OFF-ON-IR/PULL switch on.
7. Adjust the interpupillary distance by sliding the eyepieces together or apart so each eye can observe the entire field of view at the same time.
8. Readjust the vertical strap assembly for vertical adjustment of the head mount until the PVS-7 is properly aligned with your eyes.
9. Fold the right eyecup over the eyepiece with your right thumb or forefinger to obstruct the view through the right eyepiece. Rotate the left diopter adjustment ring for the clearest view of the image intensifier screen.
10. Fold the left eyecup over the eyepiece with your left thumb or forefinger to obstruct the view through the left eyepiece. Rotate the right diopter adjustment ring for the clearest view of the image intensifier screen.
11. Adjust the eye relief distance by pressing the socket release button and sliding the PVS-7 fore or aft to obtain a full field of view of the image. Readjust the diopter rings for best image.
12. Adjust the objective lens focus while observing an object until the sharpest image is obtained.

NOTE:
The sharpest image will be observed only when the objective lens and both eyepieces are properly focused. The objective lens focus adjustment is used to focus on objects at varying distances. The diopter adjustment rings are used to focus your eyes without glasses on the image intensifier screen. These adjustments operate independently and must be made separately. NOTE:
Any readjustment of eye relief requires readjustment of the diopter rings.

B. Helmet Mounted Operation

1. Ensure that batteries are installed.
2. Don the helmet mount.
3. Place the PVS-7 in the socket of the helmet mount. Set your eye relief by depressing the side buttons and carefully move the goggles fore or aft until the eyecups comfortably seal around the eyes. Readjust the helmet straps as required for vertical adjustment.
4. Turn power switch to ON. Adjust the tilt by using the tilt adjustment lock knob until you obtain a comfortable viewing angle.
5. Adjust the interpupillary distance by sliding the eyepieces together or apart so each eye can observe the entire field of view at the same time. The eyepieces adjust independently. If necessary, readjust the eye relief.
6. Fold the right eyecup over the eyepiece with your right thumb or forefinger to obstruct view through the right eyepiece. Rotate the left diopter adjustment ring for the clearest view on the image intensifier screen.
7. Fold the left eyecup over the eyepiece with your left thumb or forefinger to obstruct view through the left eyepiece. Rotate the right diopter adjustment ring for the clearest view on the image intensifier screen.
8. Adjust the eye relief distance by pressing the socket release button and sliding the PVS-7 fore or aft to obtain a full field of view of the image. Readjust the diopter rings for the best image.
9. Adjust the objective lens focus while observing an object until the sharpest image is obtained.
10. To flip up, place an open hand under the goggle, grasp the goggle and rotate up and rearward until the latch is firmly engaged.
11. To flip down, grasp the goggle housing and rotate down and forward until the latch is firmly engaged.
12. Turn the switch to the RESET/OFF position, then to the ON position to resume viewing.

NOTE:
The sharpest image will be observed only when the objective lens and both eyepieces are properly focused. The objective focus adjustment is used to focus on objects at varying distances. The diopter adjustment rings are used to focus your eyes with or without glasses on the image intensifier screen. These adjustments operate independently and must be made separately. NOTE:
Any readjustment of eye relief requires readjustment of the diopter rings. NOTE:
The PVS-7 will be turned off automatically when flipped up. The PVS-7 will not turn on automatically when flipped down.

C. Hand-Held Operation

CAUTION:
OPERATE THE PVS-7 UNDER DARKENED CONDITIONS ONLY OR USE THE LENS CAP TO COVER THE OBJECTIVE LENS FOR DAYLIGHT CONDITIONS. NOTE:
When using the PVS-7 without a mounting device, make sure to place the neck cord around your neck.

1. Ensure that the batteries are installed.
2. Turn the RESET/OFF-ON-IR/PULL switch to ON.
3. Adjust the interpupillary distance by sliding the eyepieces together or apart so each eye can observe the entire field of view at the same time.
4. Hold the PVS-7 with your left hand and fold the left eyecup over the eyepiece with your left thumb or forefinger to obstruct view through the left eyepiece. Rotate the right diopter adjustment ring for the clearest view on the image intensifier screen.
5. Hold the PVS-7 with your right hand and fold the right eyecup over the eyepiece with your right thumb or forefinger to obstruct view through the right eyepiece. Rotate the left diopter adjustment ring for the clearest view on the image intensifier screen.
6. Readjust the objective lens assembly while observing an object until the sharpest image is obtained.

NOTE:
The sharpest image will be observed only when the objective lens and both eyepieces are properly focused. The objective focus adjustment is used to focus on objects at varying distances. The diopter adjustment rings are used to focus your eyes with or without glasses on the image intensifier screen. These adjustments operate independently and must be made separately.

D. Operation with Compass Assembly

NOTE:
The objective lens focus can be fine tuned after installation, but in order to obtain an accurate reading, the compass must be vertical. The compass image must be level.

1. Install the compass assembly.
2. If necessary, to more clearly view your distant object, adjust the objective focus slightly by gripping the compass and turning clockwise.
3. To view the compass through the PVS-7, grip the compass with index finger on top and thumb on illumination button on the bottom. Press the button slightly with thumb until proper brightness is obtained.
4. The compass readings should change when you move your head from side to side. Rotate or tap compass slightly to ensure compass is operating correctly. Hold the PVS-7 in a level position to assure live rotation of the compass scale.
5. The tick mark closest to the center of the lighted display is the compass bearing. The tick marks are in degrees, with longer marks every five degrees and bearing labels every 10 degrees.

NOTE:
Increase brightness slowly: if brightness is increased too quickly, excessive brightness may burn a temporary image into the image intensifier. The goggle must be focused at or near infinity for proper compass operation. WARNING:
THE COMPASS ILLUMINATOR CAN BE SEEN BY OTHERS USING NIGHT VISION DEVICES. NOTE:
The compass reading is magnetic north, not true north. The compass reading is within 2° of correct absolute magnetic bearing. Compass readings with a mounted PVS-7 can be up to ±15° of correct absolute magnetic bearing. This occurs most in the East (90°) to West (270°) and less in the North (0°) to South (360°) reading. If the compass is inadvertently magnetized, this could cause an additional 15° error.

E. Use of the 3X or 5X Magnifier Lens Assembly

The 3X or 5X magnifier lens assembly can be threaded directly into the 1X objective lens, with the light interference filter (LIF) and sacrificial window removed. It can also be threaded into the focus ring adapter and slipped on over the end of the objective lens with the LIF installed.

NOTE:
The neck cord can be used to tether the magnifier to your person to prevent losing the lens if it is dropped. To use the neck cord, tie the end without the clip tightly around the magnifier and attach the clip to a buttonhole, belt loop or other convenient point.

F. Infrared (IR) Operations

WARNING:
THE IR ILLUMINATOR IS A LIGHT THAT IS INVISIBLE TO THE UNAIDED EYE FOR USE DURING CONDITIONS OF EXTREME DARKNESS. HOWEVER, THE LIGHT FROM THE ILLUMINATOR CAN BE DETECTED BY THE ENEMY USING NIGHT VISION DEVICES.

1. Pull the RESET/OFF-ON-IR/PULL switch knob out and rotate clockwise to the IR position. With the PVS-7 held to the eyes, observe that a red light appears in the left eyepiece. This indicates that the IR illuminator is operating. When spring-loaded momentary IR position is used, the illuminator should only flash on.
2. To operate with the IR spot/flood lens: pull the RESET/OFF-ON-IR/PULL switch knob out and rotate clockwise to the IR position. With the PVS-7 held to the eyes, turn the IR spot/flood until you have achieved the optimum illumination of the desired distance.
3. Turn the RESET/OFF-ON-IR/PULL switch counterclockwise to the ON position. Observe that the red indicator disappears.

2-9 PREPARATION FOR STOWAGE

A. Shutdown

1. Turn the RESET/OFF-ON-IR/PULL switch to the OFF position.
2. Remove the PVS-7 from the head mount or helmet mount, if so equipped, by depressing the latch lever and removing the PVS-7 from the socket.

B. Packaging After Use

1. Unscrew the battery cap and remove the battery or batteries.
2. Inspect the battery compartment for corrosion or moisture. Clean and dry if necessary.
3. Replace the battery cap.
4. Remove the demist shields, sacrificial window or compass assembly if installed. Install the lens cap.
5. Place demist shields, batteries, carrying case strap, lens paper, sacrificial window, manual, LIF, brow pads, head mount, helmet mount and compass into the carrying case.
6. Place the PVS-7, objective lens down, into the shallow pocket of the carrying case.
7. Place the carrying case into the shipping/storage case; close and latch it.
8. Return to storage area.

NOTE:
Prior to placing the PVS-7 assembly into the carrying case, ensure the goggle and case are free of dirt, dust and moisture.

TROUBLESHOOTING PROCEDURES

3-1 TROUBLESHOOTING

Table 3-1 lists common malfunctions that you may find with your equipment. Perform the tests, inspections and corrective actions in the order they appear in the table. This table cannot list all the malfunctions that may occur, all the tests and inspections needed to find the fault, or all the corrective actions to correct the fault. If the equipment malfunction is not listed or actions listed do not correct the fault, notify your maintainer.

Malfunction	Test / Inspection	Corrective Action
1. Goggle fails to activate	Visual. Turn switch to RESET/OFF position and then ON. Check for defective, missing or improperly installed battery(ies).	Replace battery(ies) or install correctly. If PVS-7 still fails to activate, refer to higher level of maintenance.
2. IR indicator fails to activate	Visual.	Refer to higher level of maintenance.
3. Poor image quality	Check objective lens or eyepiece focus. Check for fogging or dirt on lens.	Refocus. Clean lens surface.
4. Light visible around eyecup	Check eye relief distance. Check eyecup for resiliency.	Readjust for proper eye relief distance. If eyecups are defective, refer to higher level of maintenance.
5. Diopter adjustment cannot be made	Check to see if the diopter adjustment ring is bent or broken.	If damaged, refer to higher level of maintenance.
6. Interpupillary adjustment cannot be made	Defective eyepiece assembly.	Refer to higher level of maintenance.
7. Battery cap difficult to turn	Check for dirt or grit in threads. Visually inspect for the presence of an O-ring. Check for damaged battery cap or threads on battery compartment.	Clean. If O-ring is missing or parts are damaged, refer to higher level of maintenance.
8. PVS-7 does not shut off when removed from head mount during operation	Visual.	Return both the PVS-7 and head mount to higher level of maintenance.
9. Head straps cannot be tightened	Check for defective buckles, fasteners or straps.	If damaged, refer to higher level of maintenance.
10. Head mount or helmet mount socket and goggle do not catch	Check socket or latch for dirt. Check socket or latch for damage.	Clean socket and latch. If damaged, return both head mount or helmet mount and PVS-7 to higher level of maintenance.
11. Helmet mount will not tighten to helmet	Visual.	If damaged, refer to higher level of maintenance.
12. LIF will not thread in or obstructs view	Check for dirt in threads. Check for damaged assembly.	Clean threads. If damaged, refer to higher level of maintenance.
13. IR spot/flood lens will not adjust	Visual.	Refer to higher level of maintenance.
14. Compass does not illuminate	Visual.	Refer to higher level of maintenance.
15. Compass will not stay on the PVS-7	Visual. Possibly missing an O-ring.	Refer to higher level of maintenance.
16. Compass display is not clear	Visual.	Make sure the PVS-7 is focused for infinity. If so and compass display is still not clear, refer to higher level of maintenance.
17. PVS-7 does not shut off when exposed to high light	Perform the following tests under daylight or bright room light: place the lens cap on the objective lens, turn PVS-7 on and observe that it shuts off within 70 (±30) seconds after energized. Turn goggle off and then on to re-energize.	If damaged, refer to higher level of maintenance.

MAINTENANCE PROCEDURES

3-2 CLEANING THE PVS-7

CAUTION:
THE PVS-7 IS A PRECISION ELECTRO-OPTICAL INSTRUMENT AND MUST BE HANDLED CAREFULLY. DO NOT SCRATCH THE EXTERNAL LENS SURFACES OR TOUCH THEM WITH YOUR FINGERS.

Clean the goggle with water if necessary and dry thoroughly. Clean lenses with lens paper and water if necessary, except for demist shields.

CAUTION:
WIPING DEMIST SHIELDS WITH LENS PAPER WHILE WET CAN DAMAGE THE COATING.

3-3 HEAD MOUNT MAINTENANCE

A. Brow Pad Replacement

Replace the brow pad when cracked, torn or contaminated.

CAUTION:
FOR PROTECTION OF THE IMAGE INTENSIFIER, DISCONNECT THE PVS-7 FROM THE HEAD MOUNT PRIOR TO REPLACING BROW PADS.

1. Firmly grasp the head mount and remove the old brow pad.
2. Gently press on the new brow pad. Lightly smooth out any wrinkles in the new brow pad.

B. Neck Pad Re-installation

During operation of the goggle, it is possible for the neck pad to become separated from its position on the headband.

1. Lift the upper headband strap retention tab, allowing the neck pad strap to be inserted underneath.
2. Slip the neck pad strap all the way under the upper strap retention tab and then pull the lower part of the neck pad strap under the lower strap retention.
3. Repeat steps 1 and 2 for the other side of the headband and neck pad if necessary.

C. Lacing the Sliding Bar Buckles

While donning and adjusting the head mount, it is possible for a strap to slip out of a slide fastener.

1. Thread the strap from the inside of the buckle over the moveable sliding bar. Thread the strap back through the buckle, but this time under the sliding bar and over the serrated part of the buckle.
2. Pull the strap through the buckle and tighten as necessary.
3. Repeat steps 1 and 2 for any other straps and buckles that may have come undone.

SYSTEM OPTIONAL EQUIPMENT

Item	Description	Qty	Part No.
1	Helmet mount assy.	1	ATN3256390
2	Objective filter assy., LIF	1	ATN5009737
3	Sacrificial window assy.	1	ATN3144264
4	Demist shield assy.	2	ATN31442632
5	Case, shipping/storage	1	ATN3187393
6	Battery, lithium	1	BA-5567/U
7	3X afocal lens assy.	1	ATN5009717
8	Kit adapter, 3X afocal, 7D	1	ATN5009718
9	5X afocal lens assy.	1	ATN5009719
10	Kit adapter, 5X afocal, 7D	1	ATN5009720
11	Objective lens, 3X, 7D	1	ATN5009721
12	Objective lens, 4X, 7D	1	ATN5009722
13	Objective lens, 6X, 7D	1	ATN5009723
14	Sacrificial filter assy., 75mm	1	ATN3144265
15	Sacrificial filter assy., 108mm	1	ATN3144266
16	Sacrificial filter assy., 162mm	1	ATN3144267
17	Lens cover assy., 75mm	1	ATN5009724
18	Lens cover assy., 108mm	1	ATN5009725
19	Lens cover assy., 162mm	1	ATN5009726
20	Tripod adapter assy. (4X/6X)	1	ATN3187394
21	Shipping case assy.	1	ATN3187395
22	Mount assy., 7D-SPH-5CG	1	ATN3187396
23	Objective lens assy., 54mm	1	ATN5009710

FOR TECHNICAL INFORMATION

ATN Corp.
1341 San Mateo Avenue
South San Francisco, CA 94080
800-910-2862
650-989-5100 tel.
(650) 875-0129 fax
www.atncorp.com
info@atncorp.com