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NVGs TM F4949-1 > NVG > Flashcards

NVG Flashcards

1
Q

What type of batteries does the 4949 use?

A

AA 1.5 volts, no more. No rechargables

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2
Q

What is the field of view of our NVGs?

A

40 degrees

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3
Q

What Magnification do the goggles provide.

A

None, they are 1:1

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4
Q

How many G’s are the goggles break away good for .

A

11 to 15g’s

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5
Q

How much do the goggles weigh?

A

1.70 lbs.

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6
Q

How many adjustment are there of the F4949

A

6

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7
Q

Name the adjustments on the F4949

A

Fore-aft, inter-pupillary, tilt, objective focus, eyepiece diopter

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8
Q

How do you know when battery is low?

A

low battery indicator red flashing light

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9
Q

What are the Unacceptable Faults of the NVG ?

A

Shading
Edge Glow
Flashing, Flickering, or Intermittent Operation

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10
Q

What causes Shading.

A

Occurs when the MCP shifts from the NVG’s being dropped or mishandled.

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11
Q

What is a possible cause of Edge Glow?

A

Can also result from MCP shift.

Confirm by cupping hands over objective lens.

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12
Q

Flashing,flickering, or intermittent Operation causes.

A

May occur in both tubes.

Can be caused by faulty power supply or loose battery cap.

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13
Q

What are the acceptable faults?

A

Bright Spots, Emission Points, Distortion, veiling glare

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14
Q

What are Bright Spots.

A

May flicker or remain constant.
If they disappear when hand covers lens, its a bright spot.
Defect in either phosphor screen, or aluminum oxide film covering MCP.

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15
Q

What are Emission Points?

A

May flicker or remain constant.
If they remain when hand covers lens, then it is an Emission Point.
Caused by an object between photocathode and MCP.

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16
Q

Acceptable Faults are?

A 
Black spots
Chicken Wire
Fixed Noise Pattern
Image Disparity
Output Brightness Variation
17
Q

What caution must be exercised when removing goggles from mount?

A

Do not twist, pull the goggles straight out with even pressure.

18
Q

What is the inspection period for the NVG’s?

A

180 days

19
Q

When replacing batteries you should always do what?

A

Turn battery back off!

20
Q

Which battery set is the primary?

A

Right Side

21
Q

What are the names of the two focus rings?

A

Outer: Objective Focus Ring
Inner: Eyepiece focus ring.

22
Q

What powers the low battery indicator?

A

Either battery compartment which ever has highest voltage.

23
Q

Name the six adjustments on the F4949?

A 
Vertical
Fore Aft
Eyepiece 
Objective
Tilt
Eye Span or Inter-pupillary
24
Q

Simply put how do the NVG’s work?

A

They take ambient light and intensify it approximately 6000 times.

25
Q

What is the average life of two AA batteries in the F4949?

A

Approximately 22 hours at 73 degrees F.

NVGs TM F4949-1 (1 decks)

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