Meiji Techno MT9000 Series Specifications download pdf (Page 13)

2.7 Centering the Objectives

When objectives

are

not centered,

specimens

may leave the field

view when rotating the

stage.

Perform the

steps below

objectives

are

not centered

properly:

1 . Before

starting, make sure that the 10X objective is installed in the

fixed

hole of the nosepiece. This is the

position

that does NOT have

centering

screws. All

objectives

will

be adjusted against

the 1 0X

position.

2. Make

sure

the Bertrand Lens, the

analyzer and any other sliders are clear of the optical

path

and the

iris on the illuminator is open all the way.

3. Use a small

grain

some

type

target and

place

it in the

center of

the field

view with the 10X

objective and bring

into

focus

as shown below in

"A".

Center

the

target by rotating the stage and evaluating how centered the target appears.

5. Once the target is centered, move to the next highest

objective

and insert the centering keys into the

nosepiece for that

position.

6. Bring

the specimen again into

focus

and

note

its

position

in the

lield

of view.

7. Rotate the

stage until the target moves larthest away from the crossline at the as shown below in

"D"(Position

1).

8. Adjust the

centering screws on the

nosepiece

until

the

target

is midway

belween

Position 1

and

the

crossline as shown

"D".

L Rotate the stage and

evaluate

centricity. One may need to repeat this

procedure

until

the target

srays

in the center of the crossline when the

stage

is rotated

("D").

Repeat these steps for all

other

objectives in the nosepiece. To maintain centering, it is important that

objectives be

handled very

gently

and only touched on the knurled

portion

when changing objectives.

/,'D\

\ott

vL-/

Analyzer

Bertrand lens

Centering

key

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Meiji Techno MT9000 Series Specifications Page 13

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