Meiji Techno EM-20 Series User manual

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Table of Contents
1) Introduction
2-3) Construction of the microscope
4-5) Functions of the microscope
6) Preparing the microscope for use
7-9) Working with the microscope
10-11) Maintenance and cleaning

Introduction
With your purchase of an MT-10 series range stereo
microscope you have chosen for a quality product.
The EM-20 range microscopes are developed for use
at schools and laboratories.
The stereo microscope consists of two separate
microscope tubes which are combined as a unit, in
order to focus them simultaneously on the object.
Each tube has prisms, achromatic objectives and a
wideeld eyepiece in order to obtain a large, at eld
of view. Both eyes are looking at the object under a
dierent angle to reach a deep stereoscopic image.
The maintenance requirement is limited when using
the microscope in a decent manner.
This manual describes the construction of the
microscope, how to use the microscope and
maintenance of the microscope.
EM-20 Series
Turret Stereo
INSTRUCTION MANUAL

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Construction of the Microscope
The names of the several parts are listed below and
are indicated in the picture on the next page:
A) Eyeshade
B) Diopter adjustment
C) Revolver (objective changer)
D) Illumination adjustment
E) Object clip
F) Stage plate
G) Stand foot with built-in illumination
H) Pillar
I) On/o switch
J) Incident illumination
K) Focusing knob
L) Handle
M) Prism housing
N) Wideeld eyepiece

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
A
B
C
D
E
F
G
H
I
K
L
N
M
I

Functions of the Microscope
The stand consists of a stand arm (C), stand base and an object stage (G).
Tube
The EM-20 models are equipped with a 45 degrees inclined tubes.
Optical specications of the MT-30/MT-90 series range
All models are equipped with paired wideeld 10x eyepieces (N).
Depending on the model there are:
1x/3x objectives mounted in one revolving nosepiece.
2x/4x objectives mounted in one revolving nosepiece.
1x/2x/3x objectives mounted in one revolving nosepiece.
1x/2x/4x objectives mounted in one revolving nosepiece.
Total magnication is calculated by multiplying the magnication of the eyepieces with the
magnication of the objectives. The eyepieces are locked in the tubes by means of a small
screw.
Object stage
The EM-20 stereo microscopes are equipped with an transparent object stage and 2 object
clips. All models have a transmitted and a incident LED illumination.
Focusing
With the focusing knobs (K) the object can be sharply focussed.
The working distance (distance between front of objectives to top of object) is about 60 mm.
Revolver of Dual Magnication models
These models are equipped with 2 pairs of achromatic objectives mounted in one revolver
(objective changer). By turning this nosepiece another magnication is set. Turn the
nosepiece untill it clearly “clicks” into position.
Revolver of Triple Magnication models
These models are equipped with 3 pairs of achromatic objectives mounted in one revolver
(objective changer). By turning this nosepiece another magnication is set. Turn the
nosepiece untill it clearly “clicks” into position.
EM-20 Series
Turret Stereo
INSTRUCTION MANUAL

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Illumination
All models have a transmitted (diascopic) and incident LED illumination.
With use of the potentiometer switch (D) the illuminators can be adjusted in intensity and
both illuminations can be used simultaneously.
With the switch (I) the illuminations can be switch IN and OUT.
Tension adjustment
When the system lowers itself by its own weight, the tension of the focusing knob (K)
should be adjusted. This is done by turning the two focusing knobs in opposite (clockwise or
counterclockwise) directions

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Preparing the Microscope for Use
Take the stereo microscope out of its packing and put
it on a rm stable table
Insert the plug of the power supply adapter into the
mains supply and switch on the illumination with
the On/o switch (I) and place the eyeshades onto
the eyepieces. Sit comfortably down behind the mi-
croscope and take a relaxed position while viewing
through the eyepiece.

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Working with the Microscope
• Place an object onto the object plate and adjust the height of the holder randomly
with the screw (P) at the backside of the stand.
• Adjust the interpupillary distance by moving both prism housings (M) towards each
other until one round image is seen with both eyes.
• Focus the specimen by means of the focusing knobs (K) on both sides of the holder.
• For normal observation both tubes should have the same length, but to adjust any
dierence between the two eyes, proceed as follows: focus sharply on a at specimen, only
using the right eye, looking through the right eyepiece. Now look through the left eyepiece,
only with the left eye and focus the specimen with the diopter adjustment ring on the left
tube.

EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
Maintenance and Cleaning
Always place the dustcover over the microscope after use. Keep the eyepiece
and objectives always mounted on the microscope to avoid dust entering the
instrument.
Cleaning the optics
When the eyepiece lens is dirty it can be cleaned by wiping a piece of lens paper
over the surface (circular movements). When this does not help put a drop of
xylol or alcohol on the lens paper. Never put xylol or alcohol directly on the lens!
When dirt is clearly visible in the eld of view it resides on the lowest lens of the
eyepiece. By using the Allen-key the eyepiece can be removed from the tube.
Clean the outside of the lens.
In case there is still dust visible please check if the dust is in the eyepiece by
turning it. If this is the case remove the lowest lens carefully from the eyepiece
and clean it.
Caution
• Cleaning cloths containing plastic bers can damage the coating of the
lenses!

Maintenance of the stand
Dust can be removed with a brush. In case the stand or stage plate is really dirty
the surface can be cleaned with a non-aggressive cleaning product.
Charging the batteries
At rst use, the batteries should be charged. Connect the cable of the charger to
the inlet at the back side of the microscope base, and connect the charger to the
mains supply. The rst charging will take about 20 hours to reach full capacity.
Exchanging the batteries
Caution: Always remove the power adapter from the mains supply
before changing the bulb!
• Remove the battery compartment cover from the bottom plate.
• Replace the 3 batteries (AA type) in the correct order and place the battery
cover back again.
EM-20 Series
Turret Stereo
INSTRUCTION MANUAL
/DXPDQ/DQH6XLWH$+LFNVYLOOH1HZ<RUN
7HO)D[
ZZZPLFURVFRSHLQWHUQDWLRQDOFRPLQIR#Q\VFRSHVFRP
1HZ<RUN0LFURVFRSH&RPSDQ\,QF