INSTRUCTION MANUAL

L-51
Thank you for purchasing the HOZAN L-51 STEREO MICROSCOPE. With proper careand handling, this fine instrument will provide years of trouble-free operation. Please readthis entire instruction manual carefully before attempting to place this instrument in service.
Please keep this instruction manual available for reference.

Identification of parts and contents
Eyepieces with eyesight adjustment
Eye cup (short)
Head

Accessories

Post
Holder

ESD rubber mat

Holderset knob
Focus knob

Sight adjust ring

Ground cord

Head set screw
Lens filter
with adapt ring

Insulation cover
for alligator clip
4 pairs ofhook and loop
fasteners
Eye cups(long)

Clip

Stage

Table

Dust sheet

Specifications
Objectives
Eyepieces

10X/20X

Stereo head spec.

1X/2X selection format

Pupil distance range
Table dimensions

200(W)X255(D)mm

Post height

282mm
133mm

Focusing

Weight１3.8kgWarning and caution symbols
These symbols are used throughout the instruction manual to alert the user to potential
safety hazards as follows :Warning … Notice when incorrect handling could cause the user's death or serious
injury.
Caution … Notice when incorrect handling could cause injury to the user or material
damage.
Even if the instructions do not have Caution mark, there are some possibilities for aserious situation. Follow the instructions.

Precautions
 Warning
1. To prevent the unit from falling and possibly causing injury to personnel, do notplace this unit on unstable places, on tables with casters.
2. Do not unnecessarily remove the stereo head or the holder from the post or theholder. If it becomes necessary to remove them, hold them with both hands toprevent dropping them and possibly causing injury to personnel.

 Caution
1. Do not disassemble or modify the L-51 yourself, otherwise this could cause amalfunction.
2. Always keep the lens filter in place to prevent dust or fumes from contaminating theinterior of the microscope.
3. When using the rubber mat, be sure to ground, otherwise this could damage theobject such as PCB.
4. Protect the unit against physical shock or vibration during transport. Otherwise, thiscould cause a malfunction.
5. Do not expose the unit to prolonged direct sunlight, high temperature, high humidity,or dust. Such exposure could cause a malfunction.

Preparation
First, make sure that the contents are complete.

Procedures in case of not using the ESD rubber mat
the table accompanied by the post and the holder
１ Settle
on an appropriate place.
Put on the stage. Orient it pressing the spring at the endof the hole as shown in the photo.
Choose black and white faces of the stage in accordance with object to be inspected.

２Preparation
the holder at the low end on the２ Mountpost.
Turn toward the front, then securely
tighten the holder set knob.

Holder set knob

Mount the head.

toward the front and secure the３ Turnhead set screw into any female
screws, right, left or front.

Head set screw

Remove the cap from the objectives
４ andattach the lens filter accompanied by the adapt ring.

the caps from the barrels.
５ Remove
Then, insert the eyepieces into theObjectives

Lens filter withadapt ring

Eyecup (short)barrels.

Eyepiece

Please use eyecups (long) if necessary.
< How to attach the eyecup (long) >1. Remove the eyecup (short) .
2. Attach the eyecup (long) as sownin the illustration.

Eyecup (long)
Engage theprojection withthe groove.
Eyepiece

Choose to suit
Eyecup (short)・for persons in spectacles
Eyecup (long)・for persons in contact lenses or without spectacles
Bringing inspector’s cheekbones at eyecups (long) stables his/her eyepoints.
・for blocking the slanting rays

３

Preparation
Procedures in case of using the ESD rubber mat
The provided rubber mat is a static controlled ESD rubber mat. Use it withgrounding when inspecting electronic components which are sensitive to staticelectricity. Refer to page 8 regarding ESD measures.
the table accompanied by the post
１ Settle
and the holder on an appropriate place.
Also the stage should be set on thetable.

ESD rubber mat

the holder set knob and remove
２ Loosenthe holder. Then, remove the clips.

Finally, insert the rubber mat through thepost with the green side up.

Clips
Table

the hook and loop fasteners to the３ Attach
top of the table and the black side of therubber mat so that they can stick
together.

Hook and loop
fasteners

the alligator clip into the insulation
４ Insert
cover for protection of electric shock.

Then, attach the socket of the ground cord
to the stud of the rubber mat behind thepost. Finally, connect the insulated*alligator clip to the ground.
*Cut the cover to the proper length asneeded.

Ground cord

Grounding

５ Mount the holder on the post.
After this procedure, refer to 2-5 of“Procedures in case of not using the ESDrubber mat” on pages 3.

４

Operationagreed “0” of the graduation with each setting dot,
１ Be
refer to the photo, of both the eyepieces.

Keep this setting since the right and left eyesight will be
adjusted at the main unit side (refer to 6 of page 6).
Setting dot

both the sight adjust rings so that
２ Rotate
the silvery setting lines are barely visible.

Sight adjust ring
Setting line

the eyepiece distance with your pupil distance to３ Adapt
view a single circle of the field.
The stereo barrels will rotate drawing arcs interlocking
with (refer to the photo).

an object just under the objectives.
４ Place
Prepare lighting apparatus such as Hozan’s L-711 LED
LIGHT (refer to page 7) if necessary.

for proper focus with the focus５ Adjustknob while looking with both eyes.

If the focus knob does not focus
enough, move the holder up anddown under loosening the holder setknob.
Always aim the same point if the surface of the object is not simply flat,otherwise the working distance* could
differ from before and this could notcome into focus.
*Working distance means the dimension from the top of lens filter to theobject.

Holder set knob

Focus knob

 Caution
Loosen the holder set knob while supporting the holder with one hand when move it
up and down. Otherwise, the holder could fall down suddenly damaging the unit, theobject and the operator.

５Operation
image is out of focus, it is due to the difference of
６ Ifrighttheandleft eyesight.

First, turn the sight adjust ring for proper focus by looking
with the dominant eye while closing the other eye.
Then, adjust the other eyepiece similarly.

Proceed to procedure 8 if the image looking with both eyes is in focus.
If the image is still not in focus, adjust each eyepiece again.
Treat procedures 4 to 5 and check if the image is in focus.
７ Repeatthese procedures so that a clear image can be obtained whenever the zoom
magnification is changed.

magnification among 1X and 2X.
８ Choose
The working magnification is indicated by
the stamp, carved on the objective barrel,
which comes the front.
The objective barrel rotates only 90°
between these 1X and 2X.

Front

９ Store the L-51 putting the dust sheet and such on after use.
Transfer
Hold the table by one hand and the post by the other hand tightly when transfer the L-51.

Inspecting a long object
The section of a long object and such can be inspected
through the hole from which the stage has been detached.

 Caution
Carefully work not to throw the table down.

Adjusting the tightness of the focus knob
The tightness of the focus knob for vertical movement can be adjusted.
Turn the right focus knob counterclockwise while holding the left focus knob securely
to decrease the tightness, or turn it clockwise to increase the tightness.
*Do not loosen unnecessarily, otherwise the stereo head could suddenly slidedown.

６Optional accessories
Use only the following optional accessories.

Photographic equipment
L-835 USB camera
Specimens under a microscope are photographed (stilland video) mounting on it through the L-845 Adapter kit.
Still images can be edited using the provided software.
Without lenses.

L-835

L-846 Lens unit
L-846-2 Adapter
Connecting the microscope and a digital camera with C
mount, images of the full field being seen actually
through the microscope are taken in high-definition.

L-846

L-846-2

Lighting systems
L-711 LED light
The light has few fluctuations of brightness and no flicker
at all.

L-711

Various lighting systems can be used. Please refer to our catalog or web catalog.

Option lenses
L-546-10 Eyepieces (10X), standard
L-546-20 Eyepieces (20X)●●A pair per pack
With eyecups (long & short)* Eyecups (short) are attached when ship.

L-546-10

L-546-20

Conversion lenses
L-57-0.5 Conversion lens (0.5X), L-57-1.5 Conversion lens (1.5X) and L-57-2.0
Conversion lens (2X) are available. To install, first remove the lens filter, thenreplace the conversion lens and lens filter. Do not remove the adapt ring.
The magnification, filed of view and working distance gotten when combining eyepieces,objectives and conversion lenses are follows.

Magnification table

40520 1030 6.67
38

30 6.6720 103860 3.33

40527405mm

X

Field of viewmm φ

L-57-2mmX

Field of view
mm φ

15163

2X

X

10 20163

10 20mmX

401X

L-57-1.5
Field of view
mm φ

584mm

X

20 1084

20 10mmX

Field of view
mm φmm10 20

Field of view
mm φ

L-546-10(WF10X)
L-546-20(WF20X)X

Eyepiece

Field of viewmm φ

L-57-0.5

2X

Field of view
mm φ

1X

mm

2X

X

1X

Field of viewmm φ2Xmm

1X

Objective

Standard item

27
80 2.5*The “working distance” is the distance from the end of the filter to the subject.

７

1-2-12 Saiwaicho, Naniwa-ku, Osaka 556-0021, Japan
https://www.hozan.co.jp/E/
E-mail：th@hozan.co.jp
23.09