KERN OZL-45 User manual

OZL-45-BA-e-1510
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-mail: [email protected]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
User instructions
Stereo zoom microscope
KERN OZL-45
OZL 451, OZL 453
Version 1.0
01/2015

OZL-45-BA-e-1510 2
GB
KERN OZL-45
Version 1.0 01/2015
User instructions
Stereo zoom microscope
Table of contents
1Before use....................................................................................3
1.1 General notes............................................................................................................................ 3
1.2 Notes on the electrical system................................................................................................ 3
1.3 Storage ...................................................................................................................................... 4
1.4 Maintenance and cleaning....................................................................................................... 5
2Nomenclature...............................................................................6
3Basic data.....................................................................................7
4Assembly......................................................................................8
5Operation and functionality.......................................................10
5.1 Getting started........................................................................................................................ 10
5.2 Adjusting the interpupillary distance................................................................................... 10
5.3 Adjusting the magnification.................................................................................................. 10
5.4 Dioptre adjustment and focussing ....................................................................................... 11
5.5 Adjusting the stand................................................................................................................ 12
5.6 Using eye cups / High Eye Point eyepieces ........................................................................ 13
5.7 Lighting control ...................................................................................................................... 14
5.8 Using external illumination units.......................................................................................... 14
5.9 Changing the bulb.................................................................................................................. 15
5.10 Changing the fuse .................................................................................................................. 15
6Optical data ................................................................................16
7Features......................................................................................16
8Trouble shooting........................................................................17
9Service........................................................................................18
10 Disposal......................................................................................18
11 Further information....................................................................18

3 OZL-45-BA-e-1510
1 Before use
1.1 General notes
You must open the packaging carefully, to make sure that none of the accessories in
the packaging fall on the floor and get broken.
In general, microscopes should always be handled carefully because they are
sensitive precision instruments. When using or transporting the microscope it is
particularly important to avoid abrupt movements, as this may damage the optical
components.
You should also avoid getting dirt or finger prints on the lens surface, because in
most cases this will reduce image clarity.
To maintain the performance of the microscope, it must never be disassembled. So
components such as lenses and other optical elements should be left as they were
before use. Also the electrical parts in the base of the device must not be tampered
with, as in this area there is an additional risk of triggering an electric shock.
1.2 Notes on the electrical system
(OZL 451)
Before connecting to a mains power supply, you must make sure that you are using
the correct input voltage. The information to select the correct power supply is
located on the device, on the rear of the stand base. You must comply with this
information. If you do not comply with these specifications, then fires or other
damage to the device could occur.
The lighting unit must also be switched off before the mains cable is connected. In
this way you will avoid triggering an electric shock.
If you are using an extension cable, then the mains cable you use must be earthed.
If the original fuse should blow, it must only be replaced by an appropriate fuse.
Suitable replacement fuses are included with the delivery.
When carrying out any procedures whereby you come into contact with the electrical
system of the device, such as, for example, changing the bulb or fuse, only carry out
these procedures when the power is disconnected.
Under no circumstances should you touch the integrated halogen bulbs or housings
either during operation or directly after use. These bulbs produce significant heat and
therefore there is a risk that the user could be severely burnt. So before handling the
bulbs, you must check that they have cooled down.

OZL-45-BA-e-1510 4
1.3 Storage
You should ensure that the device is not exposed to direct sunlight, temperatures
which are too high or too low, vibrations, dust or a high level of humidity.
The ideal temperature range is between 0 and 40°C and a relative humidity of 85%
should not be exceeded.
The device should always be located on a rigid, smooth, horizontal surface.
For devices with pillar stands, the microscope holder must not be rotated back too
far. If you do this, there is a risk that the microscope could tip over.
When the microscope is not being used, you should fit the objective cap and cover
the microscope with the enclosed dust protective cover.
If the eyepieces are being stored separately, the protective caps must be fitted to the
tube connectors. In most cases, if dust and dirt gets inside the optical unit of a
microscope this can cause irreversible errors or damage.
The best way to store accessories which consist of optical elements, such as, for
example, eyepieces and objectives, is in a dry box with desiccant.

5 OZL-45-BA-e-1510
1.4 Maintenance and cleaning
In any event, the device must be kept clean and dusted regularly.
If any moisture should be occur, before you wipe down the device you must ensure
that the mains power is switched off.
When glass components become dirty, the best way to clean them is to wipe them
gently with a lint-free cloth.
To wipe oil stains or finger prints off the lens surface, moisten the lint free cloth with a
mixture of ether and alcohol (70 / 30 ratio) and use this to clean the lens.
You must be careful when handling ether and alcohol, as these are highly flammable
substances. You must therefore keep it away from naked flames and electrical
devices which can be switched on and off, and only use it in well-ventilated rooms.
However organic solutions of this type should not be used to clean other components
of the device. This could lead to damage to the paint finish. To do this, it is sufficient
to use a neutral cleaning product.
You could also use the following cleaning products to clean the optical components:
Special cleaner for optical lenses
Special optical cleaning cloths
Bellows
Brush
When handled correctly and checked regularly, the microscope should give many
years of efficient service.
Should repairs still be necessary, please contact your KERN dealer or our Technical
Department.

OZL-45-BA-e-1510 6
2 Nomenclature
Using the OZL 451 as an example
(with lighting)

7 OZL-45-BA-e-1510
3 Basic data
OZL 451 / OZL 453
Optical system
Greenough
Dimmable lighting
Yes
Magnification ratio
6.7:1
Tube
angled at 45°
Interpupillary distance
55 –75 mm
Dioptre adjustment
On both sides
Packaging dimensions WxDxH
345x320x470 mm
Standard configuration
Model
KERN
Tube
Eyepiece
Field of view
mm
Objective
Zoom
Stand
Illumination
OZL 451
Binocular
HSWF 10x Ø 23 mm
Ø 33 –5
0.75x –5.0x
Pillar
12V / 10W Halogen (reflected light)
12V / 10W Halogen (transmitted light)
OZL 453
Binocular
HSWF 10x Ø 23 mm
Ø 33 –5
0.75x –5.0x
Pillar
-

OZL-45-BA-e-1510 8
4 Assembly
The first step is to position the microscope stand on a firm, level surface.
The holder is already on pillar of the stand, but you must always check whether it is
fixed securely and that it is in the correct position (preferably centrally and facing to
the front).
Please see section 5.5 for more details on adjusting the stand.
The next step is to place the microscope head on the holder, by passing the
objective through the holder ring until the rest of the head is above the ring.
You must use the small silver adjusting screw on the front of the holder ring to fix the
head in place.
The alignment of the microscope head is left to the user to do and can be adjusted to
suit the individual application situations.
To make it easier to operate the focus wheels or lighting control for example, we
recommend that you position the head with the tube connectors centrally to the front.
Ideally, the holder and head are then parallel on the central axis of the stand base
(see figure on page 9).
Now you can remove the protective caps from the tube connectors so that you
can then fit the eyepieces. When doing this, please be particularly careful that you
do not touch the optical lenses with your fingers and that no dust enters the
apertures.
You should also never fit two eyepieces with different magnifications.
With regard to the use of transmitted light illumination (OZL 451) you must make
sure that the frosted glass stand inlay is fitted in the centre of the stand base,
so that the transmitted light can be used correctly.
It is always best to fix the different stand inserts using the adjusting screw on the
front side of the stand base.
Additional optional attachments:
The eye cups supplied with the microscopes can be fitted to the eyepieces.
(see section 5.6)

9 OZL-45-BA-e-1510
Assembled stereo zoom microscope (OZL 453)

OZL-45-BA-e-1510 10
5 Operation and functionality
5.1 Getting started
After assembly, if the microscope is ready for use, then for devices with lighting (OZL
451) you must first establish a power connection using the cable which is
connected to the device.
Please see section 5.7 for more details on adjusting the lighting.
Do not forget to remove the cap from the bottom of the objective, so that you will then
be able to see a reflection of the object being observed in the eyepiece.
All important functions which relate to the use of the devices in this document are
described in the following sections.
5.2 Adjusting the interpupillary distance
Different users have different interpupillary distances. So each time a different
person uses the microscope, the gap between the two eyepieces must be re-
adjusted.
While you are looking through the eyepieces, use one hand to hold the righthand or
lefthand prism housing firmly.
By rotating outwards or inwards, you can either increase or reduce the interpupillary
distance.
As soon as the lefthand and righthand visual fields exactly overlap each other, this is
the correct interpupillary distance.
5.3 Adjusting the magnification
As the KERN OZL-45 series are stereo zoom microscopes, then you adjust the
magnification using the two zoom adjustment wheels on the lefthand and righthand
side of the microscope head.
Chapter 6 “Optical data” gives information on the possible overall magnification which
the microscope can produce. It will also include the optional use of different
eyepieces and auxiliary objectives.

11 OZL-45-BA-e-1510
5.4 Dioptre adjustment and focussing
A special feature of stereo microscopes is that they are fitted with an optical unit
which has a relatively high depth of field. In order to be able get the most benefit from
this feature, each user must synchronise the focussing mechanisms for themselves.
The steps to do this are described in the following section.
1. Place the object to be observed on the working surface under the objetive.
2. Put both dioptre adjustment rings into the starting position of 0.
3. Use the zoom control dials to set the smallest possible magnification.
4. Look through the right eyepiece with the right eye and bring the object into focus
by using the focus control dials.
5. Now set the largest possible zoom factor.
6. Once again, still only looking through the right eyepiece, bring the object into
focus
7. Then set the smallest possible zoom factor again.
8. If the object then does not appear to be in focus, adjust the focus on the dioptre
adjustment ring of the right eyepiece.
9. In order to get the highest level of accuracy when adjusting the focus, you should
repeat steps 5-8.
10.Afterwards set back to the smallest possible zoom factor.
11.Then look through the left eyepiece with the left eye and use the lefthand dioptre
adjustment ring to also adjust the optimum focus of the object.
12.In this way, the object being observed will be in focus at any zoom setting.

OZL-45-BA-e-1510 12
5.5 Adjusting the stand
Torque of the focus wheels
You adjust the torque of the focus wheels by holding one of the two wheels in place
and using the other hand to turn the other wheel.
Depending on the direction of the turn, the torque will be increased or decreased.
On one hand, this function can help to make it easier to adjust the focus and on the
other hand it can prevent the microscope head from slipping down unintentionally. In
this way you can avoid possible damage which could occur if the objective lens and
the object being observed should collide.
Height adjustment
Fixing the microscope holder
With a stereo microscope on a pillar stand, the microscope head can be height
adjusted using the focus wheels and in addition, the microscope holder can be fixed
at any point on the pillar, depending on the application requirements.
To primary way to fix the position is to use an adjusting screw (1) on the holder.
There is a metal ring which also ensures sufficient grip and which is fixed with a
second screw (2) under the holder on the pillar. This metal ring proves to be
particularly useful when the screw (1) on the holder is loosened, to swing the
microscope head to the side.

13 OZL-45-BA-e-1510
5.6 Using eye cups / High Eye Point eyepieces
The eye cups supplied with the microscope can basically be used at all times, as
they screen out intrusive light, which is reflected from light sources from the
environment onto the eyepiece, and the result is better image quality.
But primarily, if eyepieces with a high eye point (particularly suitable for those who
wear glasses) are used, then it may also be useful for users who don’t wear glasses,
to fit the eye cups to the eyepieces.
These special eyepieces are also called High Eye Point eyepieces. They can be
identified by the glasses symbol on the side. They are also marked in the item
description by an additional “H” (example: HSWF 10x Ø 23 mm).
When fitting the eye cups, make sure that the dioptre setting is not moved. We would
therefore advise that you hold the dioptre adjustment ring on an eyepiece with one
hand while you fit the eye cup with the other.
Before using the microscope, users who wear glasses must remove the eye cups,
which you may find on High Eye Point eyepieces.
As the eye cups are made of rubber, you must be aware that when you are using
them, they can become slightly dirty through grease residues. In order to maintain
hygiene, we would therefore recommend that you clean the eye cups regularly (e.g.
with a damp cloth).
Eye cups
High Eye Point eyepiece
(identified by the glasses symbol)

OZL-45-BA-e-1510 14
5.7 Lighting control
(OZL 451)
Reflected light and transmitted light can be switched on separately.
The switch for transmitted light is at the left rear corner of the stand base. The
switch for reflected light is on the right rear corner.
You can also control the light intensity of the lighting units. To do this there is a
wheel fitted to the righthand side surface of the stand base. This is used for both
reflected light and transmitted light.
This means that when both lighting units are switched on, then you can only adjust
the light intensity for both units together, you cannot adjust them separately.
5.8 Using external illumination units
If, when using a microscope in its standard version, the lighting is not suitable for the
application, then it often makes sense to fit an external lighting unit to overcome this
problem.
The lighting units which are suitable for devices of the OZL-44 series, are goose neck
lighting units (see figure). These are available as LED as well as halogen versions
and also have an on/off switch or different controller.
Typical goose neck lighting unit
Using goose neck lighting units
Depending on the requirements, a goose neck lighting unit is placed next to, in front
of or behind the microscope. For halogen lighting units, the light source is in the
housing of the unit and is emitted through one or several optical fibre cables. For
LED units, on the other hand, it us usually at the end of the cable.
These cables are flexible and therefore offer a large number of positioning options,
so that the object being observed is perfectly illuminated.

15 OZL-45-BA-e-1510
5.9 Changing the bulb
(OZL 451)
Halogen
Before changing the halogen bulb(s), you must always switch off the device and
unplug it from the mains. You must also make sure that the bulb and housing have
cooled down, so that you avoid any risk of possible burn injuries.
Please always use cloth gloves or similar to hold and fit the new bulb otherwise
grease and dust residue on the surface of the bulb could have a negative effect on its
brightness and service life.
To change the halogen bulb of a transmitted light unit, you must first undo the
screw for the bulb holder on the bottom of the stand, so that you can flip out the
plate.
Then you can simply pull the bulb out of its socket and replace it with a new one.
When you have done this, you must make sure that the bulb holder on the underside
of the stand is re-fitted properly.
Important: When changing the transmitted light bulb, it is helpful if you first remove
the holder and head of the microscope from the pillar. In this way you can easily
rotate the stand and replace the bulb.
To change the halogen bulb of a reflected light unit, you must first unscrew the bulb
housing with one hand. There is a risk here that the user could be burnt. Even if it is
only operated for a few minutes, the housing will heat up significantly.
You must be particularly careful when removing the housing, as the colour filter is
not fixed on the underside and can easily fall out, if it is rotated.
Then you can simply pull the bulb out of its socket and replace it with a new one.
Attention: When selecting a replacement bulb for the reflected light unit you must
use a halogen bulb connected to a screen which should improve the beam
characteristics.
5.10 Changing the fuse
(OZL 451)
The fuse, or its holder is fitted is on the rear of microscope stand base below the
mains connector.
If the fuse has blown, then with the device switched off and the power disconnected,
the fuse can easily be pulled out and replaced with a new fuse.
You can use a flathead screwdriver to help pull out the holder.

OZL-45-BA-e-1510 16
6 Optical data
Eyepiece
Specification - Objectives
Magnification
Standard
1.0x
Auxiliary objectives
0.5x
1.5x
2.0x
HWF 5x
Total magnification
3.75x - 25x
1.875x –12.5x
5.625x –30x
7.5x –50x
Field of view mm
31 –4.6
61.3 –9.2
22 –3.3
16 –2.5
HSWF 10x
Total magnification
7.5x –50x
3.75x –25x
11.25x –75x
15x –100x
Field of view mm
33 - 5
65 - 10
22 –3.3
16 –2.5
HWF 15x
Total magnification
11.25x –75x
5.625x –37.5x
16.875x –112.5x
22.5x –150x
Field of view mm
24 –4.2
48 –8.5
16 –2.8
12 - 2
HSWF 20x
Total magnification
15x –100x
7.5x –50x
22.5x –150x
30x –200x
Field of view mm
20 –3.5
40 - 7
13.3 –2.3
10 –1.8
HWF 25x
Total magnification
18.75x –125x
9.375x –62.5x
28.125x –187.5x
37.5x –255x
Field of view mm
15.8 –2.4
31.5 –4.8
10.5 –1.6
7.9 –1.2
Working distance
113 mm
220 mm
50 mm
35 mm
7 Features
Model outfit
Kern model
Order
number
OZL
451
OZL
453
Eyepieces
HWF 5x / Ø 23.2 mm
○○
○○
OZB-A4112
HSWF 10x / Ø 23 mm
●●
●●
OZB-A4118
HWF 15x / Ø 15 mm
○○
○○
OZB-A4119
HSWF 20x / Ø 14.5 mm
○○
○○
OZB-A4120
HWF 25x / Ø 11.7 mm
○○
○○
OZB-A4121
Auxiliary
objectives
0.5x
○
○
OZB-A4201
1.5x
○
○
OZB-A4204
2.0x
○
○
OZB-A4205
Stand
Pillar, with 12V / 10W halogen lighting unit
(Transmitted light and reflected light)
●
Pillar, without lighting
●
Stand inlay
Frosted glass / Ø95 mm
●
OZB-A4805
black-white / Ø95 mm
●
●
OZB-A4806
Table
mechanical
Dimensions WxD 180x155 mm, Travel: 75x55 mm,
for reflected light and transmitted light
○
○
OZB-A4605
External
illumination
For information on external lighting units, please see the Kern Optics main catalogue,
from page 68 and visit our website www.kern-sohn.com
● = Standard configuration ○ = Option

17 OZL-45-BA-e-1510
8 Trouble shooting
Electrical system
Problem
Possible causes
The lighting unit (if fitted) cannot be
switched on
The power cable is either not connected or
not connected correctly
The bulb is not fitted
The bulb has blown
The fuse has blown
The brightness control is set to the lowest
level
The bulb has blown
The wrong bulb has been used
The input voltage was too high
The bulb flickers
The bulb is not correctly fitted
The lamp is worn out
The bulb brightness is not sufficient
The wrong bulb has been used
The input voltage is too low
Optical unit
Problem
Possible causes
You can see two images
The interpupillary distance is not set
correctly
The magnifications of the eyepieces do not
match
There is dirt in the visual field
There is dirt on the object being observed
There is dirt on the eyepiece surface
The image is unclear
There is dirt on the objective surface
The focus wheels are jammed
The torque of the focus wheels is set too
high
The microscope head slips down
while you are viewing the object
The torque of the focus wheels is set too low
Eyes get tired easily
The dioptre adjustment is not correct
The brightness adjustment is not correct
23.0 0.20 0.21 0.21 0.22 0.22 0.23 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.23 0.23 0.23 0.23 0.22 24.0 0.27 0.28 0.29 0.29 0.30 0.30 0.31 0.31 0.31 0.32 0.32 0.32 0.32 0.31 0.31 0.31 0.30 0.30 25.0 0.34 0.35 0.36 0.37 0.38 0.38 0.39 0.39 0.40 0.40 0.40 0.40 0.40 0.39 0.39 0.39 0.38 0.37 26.0 0.42 0.43 0.44 0.45 0.46 0.46 0.47 0.47 0.48 0.48 0.48 0.48 0.48 0.47 0.47 0.46 0.46 0.46 27.0 0.50 0.51 0.52 0.53 0.54 0.55 0.55 0.56 0.56 0.56 0.56 0.56 0.56 0.55 0.55 0.54 0.53 0.52
28.0 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.64 0.64 0.65 0.65 0.64 0.64 0.64 0.63 0.62 0.61 0.60 29.0 0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 0.73 0.73 0.73 0.73 0.72 0.72 0.71 0.70 0.69 0.68 30.0 0.74 0.75 0.77 0.78 0.79 0.80 0.81 0.81 0.81 0.82 0.81 0.81 0.81 0.80 0.79 0.78 0.77 0.75
Te

OZL-45-BA-e-1510 18
9 Service
If, after studying the user manual, you still have questions about commissioning or
using the microscope, or if unforeseen problems should arise, please get in touch
with your dealer. The device may only be opened by trained service engineers who
have been authorised by KERN.
10 Disposal
The packaging is made of environmentally-friendly materials, which you can dispose
of at your local recycling centre. Disposal of the storage box and device must be
carried out by the operator in accordance with all national or regional laws in force in
the location of use.
11 Further information
The illustrations may differ slightly from the product.
The descriptions and illustrations in this user manual are subject to change without
notice. Further developments on the device may lead to these changes.
All language versions contain a non-binding translation.
The original German document is the binding version.