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
Metallurgical microscope
KERN OKN-1, OKO-1
OKN 175, OKN 177
OKO 176, OKO 178
Version 1.0
01/2015
OKN-1_OKO-1-BA-e-1510
GB
KERN OKN-1, OKO-1
Version 1.0 01/2015
User instructions
Metallurgical microscope
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 Technical data / Features .............................................................................. 9
4 Assembly ...................................................................................................... 11
4.1 Reflected light unit ............................................................................................................................... 12
4.2 Microscope head ................................................................................................................................... 12
4.3 Objectives .............................................................................................................................................. 12
4.4 Eyepieces ............................................................................................................................................... 13
4.5 Colour filter ............................................................................................................................................ 13
4.6 Condenser ............................................................................................................................................. 13
5 Operation ...................................................................................................... 14
5.1 Getting started ....................................................................................................................................... 14
5.2 (Pre-) focussing ..................................................................................................................................... 15
5.3 Adjusting the interpupillary distance .................................................................................................. 16
5.4 Dioptre adjustment ................................................................................................................................ 16
5.5 Adjusting the magnification ................................................................................................................. 17
5.6 Using eye cups ...................................................................................................................................... 18
5.7 Using oil immersion objectives............................................................................................................ 19
5.8 Adjusting the Koehler illumination for transmitted light ................................................................... 20
5.9 Adjusting the illumination for incident light ....................................................................................... 23
6 Changing the bulb ....................................................................................... 25
6.1 Transmitted light ................................................................................................................................... 25
6.2 Reflected light ....................................................................................................................................... 26
7 Changing the fuse ........................................................................................ 26
7.1 Transmitted light ................................................................................................................................... 26
7.2 Reflected light ....................................................................................................................................... 26
8 Using optional accessories ........................................................................ 27
8.1 Polarisation unit (Transmitted light) .................................................................................................... 27
8.2 Camera connection (only for trinocular version) ............................................................................... 28
8.3 Dark field units (Transmitted light) ...................................................................................................... 28
8.4 Phase-contrast units (Transmitted light) ............................................................................................ 29
9 Trouble shooting.......................................................................................... 32
10 Service .......................................................................................................... 34
11 Disposal ........................................................................................................ 34
12 Further information ...................................................................................... 34
OKN-1_OKO-1-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 on the rear and 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 mains cable is located
on the device, on the rear of the product directly above the connection socket. 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 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.
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Under no circumstances should you touch the integrated halogen bulbs 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.
The microscope housing, on the other hand, is constructed so that no significant heat
radiation emanates from the device and that there is absolutely no risk of the user
burning themselves from the housing outer surfaces.
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.
When the microscope is not being used, you should cover it with the enclosed dust
protective cover. When doing this, the power supply is stopped by switching off at the
main switch and unplugging the mains cable. 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.
OKN-1_OKO-1-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.
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2 Nomenclature
OKN-1_OKO-1-BA-e-1510 6
Rear view
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Reflected light unit
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3 Technical data / Features
Eyepieces:
WF 10x / Ø 18 mm
Objectives OKN-1:
5x / 10x / 20x LWD / 40x LWD
Objectives OKO-1:
5x / 10x / 100x / 20x LWD / 40x LWD
Product dimension:
OKN 175, OKO 176
490x200x460 mm
Product dimension:
OKN 177, OKO 178
550x200x460 mm
Packing dimensions:
OKN 175, OKO 176
750x360x450 mm
Packing dimensions:
OKN 177, OKO 178
990x360x450 mm
Net weight:
OKN 175, OKO 176
13 kg
Net weight:
OKN 177, OKO 178
14,5 kg
Gross weight:
OKN 175, OKO 176
17 kg
Gross weight:
OKN 177, OKO 178
21 kg
Input voltage:
AC 100-240V, 50-60Hz
Output voltage:
DC 1,2-6V
Fuse:
2A 5x20mm
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