KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-mail: info@kern-sohn.com
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
User instructions
Jewellery microscope
(stereo zoom)
KERN OZG 497
Version 1.0
01/2015
OZG_497-BA-e-1510
GB
KERN OZG 497
Version 1.0 01/2015
User instructions
Jewellery microscope (stereo zoom)
Table of contents
1 Before 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
2 Nomenclature ............................................................................... 6
3 Basic data ..................................................................................... 8
4 Assembly ...................................................................................... 9
5 Operation and functionality ....................................................... 11
5.1 Getting started ........................................................................................................................ 11
5.2 Adjust the interpupillary distance ........................................................................................ 11
5.3 Adjusting the magnification .................................................................................................. 11
5.4 Dioptre adjustment and focussing ....................................................................................... 12
5.5 Adjusting the stand ................................................................................................................ 13
5.6 Using eye cups / High Eye Point eyepieces ........................................................................ 14
5.7 Lighting control ...................................................................................................................... 15
5.8 Fitting and adjusting a camera ............................................................................................. 16
5.9 Changing the bulb .................................................................................................................. 17
5.10 Changing the fuse .................................................................................................................. 17
6 Optical data ................................................................................ 18
7 Features ...................................................................................... 18
8 Trouble shooting ........................................................................ 19
9 Service ........................................................................................ 20
10 Disposal ...................................................................................... 20
11 Further information .................................................................... 20
OZG_497-BA-e-1510 2
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
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 main switch must also be switched off before the mains cable is connected. In
this way you will avoid triggering an electric shock.
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.
3 OZG_497-BA-e-1510
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.
OZG_497-BA-e-1510 4
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.
5 OZG_497-BA-e-1510
2 Nomenclature
OZG_497-BA-e-1510 6
Rear view
7 OZG_497-BA-e-1510
3 Basic data
Optical system
Greenough
Magnification ratio
6.7:1
Dimmable lighting
Yes
Tube
angled at 45°
Interpupillary distance
55 – 75 mm
Dioptre adjustment
On both sides
Packaging dimensions WxDxH
600x480x400 mm
Product dimensions WxDxH
340x235x580 mm
Gross weight
14,7 kg
Net weight
11,5 kg
Model
KERN
Tube
Eyepiece
Field of
view
mm
Objective
Zoom
Stand
Illumination
OZG 497
Trinocular
HWF 10x Ø 23 mm
Ø 33 – 5.1
0.75x – 5.0x
Arm
curved
12V / 10W Halogen (transmitted+incident light)
10W Fluorescent lighting (front light)
Standard configuration
OZG_497-BA-e-1510 8
4 Assembly
The first step is to position the microscope stand on a firm, level surface.
The holder is firmly attached to the pillar of the stand. You can then fit the
microscope head to the holder, by passing the objective through the holder ring until
the rest of the head is above the ring.
Please see section 5.5 for more details on adjusting the stand.
The head must then be fixed in a suitable position, using the small screw on the front
of the holder ring.
Ideally it is then parallel on the central axis of the stand base (see figure on page 10).
Then 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.
The front light is fitted to the front of the stand base using the hinged arm
delivered with the microscope. To do this there is a screw connection both on the
stand as well as the bulb housing of the front light. After that you should bring the
front light into the correct position.
Now the goose neck can be fitted. This is a bendable optical fibre, which has on
the one end section a longer metal rod and on the other end section a shorter rod.
The end section with the longer rod is used for the connection to the housing.
The appropriate connection point is on the left-hand side of the microscope below the
working stage. Before you can attach the goose neck here you have to slide the
cover plate upward and loosen the fixing screw so that it does not block the aperture.
Then the end section with the longer rod has to be pushed into the aperture up
to the stop and fixed by the screw. After that you can bring the goose neck into the
required position by bending.
The provided clamp has to be attached to the working stage instead of an already
mounted place holder. An enclosed metal pin is serving as bracket. You have to
attach this pin into a socket where there was one of the place holders before. The
clamp can easily be put on the pin by means of its counter piece.
9 OZG_497-BA-e-1510
Additional optional attachments:
The eye cups supplied with the microscopes can be fitted to the eyepieces.
(see section 5.6).
You can fit a C-mount adapter to the appropriate connection point on the top
of the microscope head. This enables you to fit and use digital cameras.
(remove protective cap first) (see section 5.9).
Assembled jewellery microscope (stereo zoom)
OZG_497-BA-e-1510 10
5 Operation and functionality
5.1 Getting started
After assembly, if the microscope is ready for use, then 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 Adjust 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 OZG 497 series covers 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.
11 OZG_497-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 objective.
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.
OZG_497-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.
Tilt function
The stand of the microscope has a tilt function. This is enabled by a hinge built-in on
the stand underneath the working stage (Tilt direction see figure below). For special
applications the tilt function can be helpful in terms of handling and ergonomics.
For tilting the microscope you have to push or pull strongly along the tilt direction on
the column of the stand (see figure below).
Due to the sluggishness of the hinge an additional fixation is not needed.
Tilt function OZG 497
13 OZG_497-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)
OZG_497-BA-e-1510 14
5.7 Lighting control
A main switches fitted on the left rear of the stand basis ensures that the device will
be supplied with power when the plug is connected.
As far as the goose neck is attached, the light source, originally intended for the
transmitted lighting, provides also the incident lighting.
You can control the light intensity of these two lightings by turning the dimmer wheel
on the right-hand side of the rear of the stand base in a particular direction.
The front light must be treated separately to the reflected and transmitted light, due to
the way it is controlled.
Indeed it also only operates if the mains switch is switched on, but it also has its
switch on its housing which can be used to switch it on and off.
It is not connected to the dimmer wheel and does not have one of its own.
So the light intensity does not vary at all.
However, the advantage of the front light is that it can be adjusted to various
positions because of its hinged arm bracket.
The transmitted lighting is in addition standardly equipped with a dark field unit. This
is absolutely necessary for gemology applications and includes two more elements,
which also can be used for controlling the lighting.
Firstly it includes an iris diaphragm, which can be operated with by a metal lever
attached to the aperture of the transmitted lighting. That serves the purpose of a field
diaphragm.
Secondly it includes a cover plate for the transmitted lighting. By turning a knob
(mounted on the working stage nearby the stand column) you can choose between
common transmitted lighting method (cover open) and dark field method (cover
closed).
15 OZG_497-BA-e-1510
5.8 Fitting and adjusting a camera
You can connect special microscope cameras to the devices in the OZG 497 series,
so that you can digitally record images or sequences of objects being observed.
The connection for this is on the top side of the microscope head.
To fit a microscope camera properly, you must use an adapter with a C-mount
thread.
There is already an adapter fixed to the camera adapter connection (white
varnishing), which is not suitable for C-Mount cameras. You firstly have to
remove this adapter in order to attach an appropriate one.
In total there are three focusable adapters to choose from (see figure below). The
difference between these adapters is that they have different integrated magnification
(0.3x, 0.5x, 1.0x).
The camera and adapter are then united using the C-mount thread.
C-mount adapter
The image which is shown on the camera connected to the device can often have a
different level of focus compared with the image on the eyepiece. In order to be able
to bring both images into focus, the focus can be adjusted by those adapters
when turning the attached black plastic ring.
OZG_497-BA-e-1510 16
5.9 Changing the bulb
Halogen
Before changing the halogen bulb, 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.
To change the bulb, the whole lamp housing, fitted underneath the working stage,
has to be removed. Therefore you have to tip the device carefully to the back or side
and then loosen the fixing screws (Allen wrench) at the bottom of the working stage.
When doing this, please make sure that all microscope components are firmly fixed.
The bulb which appears inside the open lamp housing can then be simply pulled out
of its socket and replaced with a new bulb. You must then position and fix again the
housing correctly.
Please always use cloth gloves or similar to hold and fit a new bulb otherwise
grease and dust residue on the surface of the bulb could have a negative effect
on its brightness and service life.
5.10 Changing the fuse
There is a fuse on the rear of the microscope stand base (label: “Fuse”).
If the fuse has blown, then with the device switched off and the power disconnected,
the fuse can easily be unscrewed using a flat blade screw driver and replaced with a
new one.
17 OZG_497-BA-e-1510
6 Optical data
Model outfit
Kern model
Order
number
OZG 497
Eyepieces
HWF 5x / Ø 23,2 mm
○○
OZB-A4112
HSWF 10x / Ø 23 mm
●●
OZB-A4118
HWWF 15x / Ø 15 mm
○○
OZB-A4119
HSWF 20x / Ø 14,5 mm
○○
OZB-A4120
HWF 25x / Ø 11,7 mm
○○
OZB-A4121
C-Mount
1x ○ OZB-A4809
0,3x ○ OZB-A4810
0,5x ○ OZB-A4811
Dark field
attachment
Dark field attachment
●
OZB-A4601
Object clamp
Object clamp (steel wire)
●
OZB-A4604
Stand
Arm curved, with 12V / 10W Halogen (transmitted
light) and 10W fluorescent lighting (front light)
+ Goose neck lighting
●
7 Features
● = Standard configuration ○ = Option
OZG_497-BA-e-1510 18
8 Trouble shooting
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
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
Internationale Temperatur Korrektur Tabelle für °Brix (% Zuckergradient)
Das Ergebnis um die folgenden Werte korrigieren (Refraktometer muss korrekt kalibriert sein bei 20°C)
Reading °Brix
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0
10.0 -0.53 - 0.56 -0.59 -0.62 -0.65 -0.67 -0.69 -0.71 -0.72 -0.73 -0.74 -0.75 -0.75 -0.75 -0.75 -0.75 -0.74 -0.73
11.0 -0.49 - 0.52 -0.54 -0.57 -0. 59 -0.61 -0.63 -0.64 -0.65 -0.66 -0.67 -0.68 - 0.68 -0. 68 -0.68 -0.67 -0.67 -0.66
12.0 -0.44 - 0.47 -0.49 -0.51 -0. 53 -0.55 -0.56 -0.57 -0.58 -0.59 -0.60 -0.60 - 0.61 -0. 61 -0.60 -0.60 -0.60 -0.59
13.0 -0.40 - 0.41 -0.43 -0.45 -0. 47 -0.48 -0.50 -0.51 -0.52 -0.52 -0.53 -0.53 - 0.53 -0. 53 -0.53 -0.53 -0.52 -0.52
14.0 -0.34 - 0.36 -0.38 -0.39 -0. 40 -0.42 -0.43 -0.44 -0.44 -0.45 -0.45 -0.46 - 0.46 -0. 46 -0.46 -0.45 -0.45 -0.44
15.0 -0.29 - 0.31 -0.32 -0.33 -0. 34 -0.35 -0.36 -0.37 -0.37 -0.38 -0.38 -0.38 - 0.38 -0. 38 -0.38 -0.38 -0.37 -0.37
16.0 -0.24 - 0.25 -0.26 -0.27 -0. 28 -0.28 -0.29 -0.30 -0.30 -0.30 -0.31 -0.31 - 0.31 -0. 31 -0.31 -0.30 -0.30 -0.30
17.0 -0.18 - 0.19 -0.20 -0.20 -0. 21 -0.21 -0.22 -0.22 -0.23 -0.23 -0.23 -0.23 - 0.23 -0. 23 -0.23 -0.23 -0.23 -0.22
18.0 -0.12 - 0.13 -0.13 -0.14 -0. 14 -0.14 -0.15 -0.15 -0.15 -0.15 -0.15 -0.15 - 0.15 -0. 15 -0.15 -0.15 -0.15 -0.15
19.0 -0.06 - 0.06 -0.07 -0.07 -0. 07 -0.07 -0.07 -0.08 -0.08 -0.08 -0.08 -0.08 - 0.08 -0. 08 -0.08 -0.08 -0.08 -0.07
20.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
21.0 0.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07
22.0 0.13 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.16 0.16 0.16 0.16 0.16 0.16 0.15 0.15 0.15 0.15
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
Temperatur °C
Electrical system
Optical unit
19 OZG_497-BA-e-1510
9 Service
All language versions contain a non-binding translation.
The original German document is the binding version.
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.
OZG_497-BA-e-1510 20
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