CHAPTER 5 FINAL INSPECTION - TM-9-1240-311-340028

CHAPTER 5

FINAL INSPECTION

shall be directed at a target 1200 meters in distance.

5-1.

General

b. Observe reticle lines in relation to target image.

Final inspection is performed, after repair, to ensure

Any apparent movement of reticle lines when observer's

the telescope is serviceable according to established

head is moved from side to side or up and down is the

standards and to certify the instrument for return to user.

amount of parallax. Parallax for each reticle shall not

exceed 0.2 mil at the 1200 meter setting, with parallax

5-2.

Definition

adjustment screw (5, fig. 1-1) at midpoint of total

The image will be sharp and clear at center of the field-

mechanical travel. Parallax of targets at 600 meters or

of-view when checked with the aid of a dioptometer.

infinity shall not exceed 0.2 mil. Parallax between the

telescope reticles shall not exceed 0.2 mil.

5-3.

Eyepiece Focus

a. Adjust eyepiece of dioptometer until the reticle is

5-5.

Filter Transfer Lever

sharp to the observer's eye.

The filter level shall be operable and seat firmly

b. Set dioptometer scale to zero (0) diopter.

against the stops.

c. Position dioptometer against eyepiece of the

5-6.

Optical Transfer Lever

telescope and obtain a clear, sharp image of telescope

reticle. The telescope diopter scale shall read zero (0)

The 8 to 12 power transfer lever shall be operable

plus or minus 0.25 diopter when the target image is set

and seat firmly against the stops.

at 1200 meters.

5-7.

Lamp Housing Assemblies

d. Sight through the eyepiece while rotating the

diopter scale of the telescope to its clockwise stop and

The Lamp housing assemblies shall be mechanically

note the indexed setting. Rotate the diopter scale to its

operable to permit replacement of either lamp.

counterclockwise stop, and note the indexed setting.

Eyepiece focus shall be adjustable over a minimum

range of plus to minus 4 diopters. If requirement cannot

5-8.

Reticle Illumination

be met, refer to paragraphs 3-7 a and g.

The lines of each illuminated reticle shall be bright

and clearly defined when observed with filter in the clear

5-4.

Parallax

position. Any defect, in the form of a hole, crack, or chip

a. Adjust diopter knob of telescope to obtain

appearing in the opaqued area of the reticle, shall not be

sharpest focus of the conventional and missile reticles.

brighter than the reticle lines. Such defect shall be

The line-of-sight through each reticle

cause for rejection.

5-1