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KERN OPTICS OKO 178, Operating Instructions Manual

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KERN OPTICS OKO 178 Operating Instructions Manual Download Page 27

OKO-1-BA-en-2111 

 

26 

9  Troubleshooting  

 

Problem 

Possible causes 

Lamp does not burn 

Mains plug not inserted correctly 

No power available at the socket 

Lamp defective 

Fuse defective 

Field of view is dark 

Aperture diaphragm and/or field diaphragm 

are not open wide enough 

The beam path selection slider is set to 

"Camera". 
The condenser is not properly centered 

Brightness cannot be regulated 

The brightness control is set incorrectly 

The condenser was not centered correctly 

The condenser is lowered too far 

Field of view is dark or not correct  

floodlit 

The lens was not swiveled in properly 
The beam path selector slide is in an 

intermediate position 
The object turret is not mounted correctly 

The condenser is not mounted correctly 
A lens is used that does not match the 

illumination range of the condenser. 
The condenser was not centered correctly 

The light field diaphragm is closed too far 

The lamp is not mounted correctly 

The field of vision of one eye does not 

match that of the other eye 

The interpupillary distance is not adjusted 

correctly 

The diopter adjustment has not  been made 

correctly 

Different eyepieces are used on the right and 

left 

The eyes are not used to microscopy 

 

 

Summary of Contents for OPTICS OKO 178

Page 1: ...N Sohn GmbH Ziegelei 1 D 72336 Balingen Email info kern sohn com Tel 49 0 7433 9933 0 Fax 49 0 7433 9933 149 Internet www kern sohn com Operating instructions Metallurgical microscope KERN OKO 1 OKO 178 Version 1 1 01 2021 ...

Page 2: ......

Page 3: ...2 4 4 Eyepieces 13 4 5 Color filter 13 4 6 Condenser 13 5 Operation 14 5 1 First steps 14 5 2 Pre Focusing 15 5 3 Adjusting the eye relief 16 5 4 Diopter compensation 16 5 5 Setting the magnification 17 5 6 Using the eyecups 18 5 7 Adjustment of Köhler illumination for transmitted light 19 5 8 Adjustment of the illumination for incident light 22 6 Lamp replacement 23 7 Fuse replacement 23 8 Use of...

Page 4: ...ectrical part at the back and at the bottom of the instrument must not be tampered with without further ado because here there is the additional danger of triggering an electric shock 1 2 Notes on the electrical system Before connecting to a power supply be sure to use the correct input voltage The power cord selection guide is located on the back of the unit just above the power jack Failure to f...

Page 5: ...the microscope is not in use it is best to cover it with the dust cover provided The power supply should be switched off at the main switch and the power cord removed When storing the eyepieces separately it is essential to attach the protective caps to the tube sockets Dust or dirt inside the optics of a microscope can in many cases cause irreversible malfunctions or damage Accessories consisting...

Page 6: ... are highly flammable substances Therefore it is essential to keep them away from open flames and electrical appliances which are switched on and off and use only in well ventilated rooms However organic solutions of this type should not be used to clean other components of the device This could result in changes to the paintwork It is sufficient to use a neutral cleaning agent for this purpose Ot...

Page 7: ...d tube Locking screw Microscope head LED incident light unit Dial X Y axis Object table Dimmer Coarse and fine drive Locking screw Condenser Field lens with field diaphragm Centering screw Condenser Condenser with aperture adjustment Object table Object holder Lens Objective nosepiece ...

Page 8: ...7 OKO 1 BA en 2111 Rear view Carrying handle Coarse and fine drive Main switch Mains connection Fuse LED incident light unit Power cable for incident ...

Page 9: ...OKO 1 BA en 2111 8 Incident light unit Insertion for diffuser Luminous field diaphragm Lamp housing Colour filter Polariser Analyser Aperture diaphragm ...

Page 10: ...en 2111 3 Technical data equipment Dimensions Product 550x200x460 mm Dimensions Packing 520x470x430 mm Net weight 12 kg Gross weight 16 kg Input voltage AC 100 240V 50 60Hz Output voltage DC 1 2 6V Fuse 2A 5x20mm ...

Page 11: ...OKO 1 BA en 2111 10 ...

Page 12: ...11 OKO 1 BA en 2111 4 Assembly ...

Page 13: ...e openings Finally the power cable must be used to make the connection between the lamp housing and the connection socket on the back of the microscope 4 2 Microscope head First loosen the fixing screw at the connection point of the incident light unit and remove the black protective cover The round dovetail mount on the head can now be inserted into the round dovetail mount on the incident light ...

Page 14: ...holder It can be removed at any time To use suitable filters without this retaining ring they can simply be placed in the ring holder of the field lens 4 6 Condenser The object stage should best be brought into the uppermost position using the coarse drive With the focus wheel of the condenser one must now bring the condenser carrier into a middle position This way the condenser can be inserted in...

Page 15: ...posed to too much light when looking into the eyepieces for the first time Now the illumination can be switched on via the main switch The next step is to place an object or slide with specimen on the stage The cover glass if used must face upwards for this In order to move the point of the object to be observed into the beam path the adjustment wheels on the right of the mechanical stage must be ...

Page 16: ...ns beforehand and then slowly lower it As soon as an image no matter how sharp can then be seen the correct sharpness should only be set with the fine drive Torque adjustment of coarse and fine drive Next to the left adjusting wheels of the coarse and fine drive is a ring which can be used to change the torque of these wheels Turning clockwise decreases the torque and turning counterclockwise incr...

Page 17: ...e has been set 5 4 Diopter compensation The visual acuity of the eyes of a person using the microscope can very often show minor differences which are inconsequential in everyday life but can cause problems with regard to exact focusing when using the microscope A mechanism on the two eyepieces diopter compensation rings can be used to compensate for this difference as follows 1 Move right diopter...

Page 18: ...e individual lenses but by the silver ring above the lenses see illustration When rotating the turret always make sure that the objective lens that is being brought into the beam path does not come into contact with the specimen slide This can cause considerable damage to the objective lens It is best to always check from the side whether there is sufficient clearance If this is not the case the o...

Page 19: ...n the article description example HSWF 10x Ø 23 mm With the OKO 1 series the eyecups are already attached to the eyepiece To use them simply unfold the folded rubber parts When unfolding the eyecups care should be taken not to adjust the diopter setting Therefore it is recommended to hold the diopter adjustment ring of an eyepiece with one hand while unfolding the eyecup with the other Eyeglass we...

Page 20: ...justment of Köhler s illumination the smallest possible objective magnification must first be selected so that the following steps can then be carried out 1 Move the condenser with the condenser focus wheel to a position directly under the specimen stage Switch on the illumination and focus the specimen which is placed with the cover glass facing upwards using the coarse and fine adjustment knobs ...

Page 21: ...nser too high and causing a collision with the specimen slide A little caution is therefore required here 4 Using the centering screws of the condenser carrier bring the image of the field diaphragm into the center of the field of view 5 Open the field diaphragm until it just disappears from the field of view If necessary re center slightly with the centering screws of the condenser carrier ...

Page 22: ...the eyepiece is to be removed for inspection please ensure that no dirt or dust can fall into the tube 7 Possibly change the brightness of the lamp slightly with the dimmer The brightness is always regulated via the lamp brightness and not via the aperture diaphragm 8 If necessary readjust the focus and x y axis 9 Observe object If a different magnification is subsequently selected the Köhler illu...

Page 23: ... openings must be engaged in the beam path Polarization unit analyzer polarizer In order to bring the analyzer into the beam path the analyzer slider must be brought into the insertion point on the side below the microscope head so that the integrated rotary wheel points outwards in order to be able to set the desired alignment of the analyzer If the analyzer is not to be used it must be completel...

Page 24: ...system as the cause In such a case our technical service can help 7 Fuse replacement The fuse housing is located on the rear of the microscope below the power plug connection When the instrument is switched off and the mains plug is removed the housing can be pulled out It is advisable to use a screwdriver or similar to help here The defective fuse can now be removed from its housing and replaced ...

Page 25: ...rizer is a round element with a black frame and a dark glass pane in the middle It is simply placed on the ring holder of the field lens see illustration For the subsequent use of the polarization unit two points must be observed The aperture setting of the condenser must be in position PH For its initial position the polarizer or analyzer must be rotated to the position where the highest degree o...

Page 26: ...t is recommended to first adjust the field of view via the eyepieces on the instrument for the existing requirements and then to make the observation via the microscope camera or via the PC screen connected to it The trinocular switch rod on the right side of the microscope head must be pulled out for this purpose The light of the microscope illumination is thus completely redirected into the beam...

Page 27: ...red too far Field of view is dark or not correct floodlit The lens was not swiveled in properly The beam path selector slide is in an intermediate position The object turret is not mounted correctly The condenser is not mounted correctly A lens is used that does not match the illumination range of the condenser The condenser was not centered correctly The light field diaphragm is closed too far Th...

Page 28: ...dust on the front lens of the Condenser Dirt dust on the object One side of the image is blurred The table was not mounted correctly The lens is not correctly pivoted to the beam path The revolving nosepiece is not mounted correctly The object lies with the upper side down The picture flickers The revolving nosepiece is not correct mounted The lens is not properly mounted on slewed into the beam p...

Page 29: ...ironmentally friendly materials that you can dispose of at local recycling points Disposal of the storage box and device must be carried out by the operator in accordance with the valid national or regional law of the user location 12 Further information The illustrations may differ slightly from the product The descriptions and illustrations in this manual are subject to change without notice Fur...

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