KERN OBN 141, User Instructions

Page: 14 / 43

13 OBN-14-BA-e-1510
4.5 Condenser
We recommend that you use the course adjustment knob to bring the specimen
stage to its uppermost position. Use the focus dial of the condenser to move the
condenser holder to the central position. In this way the condenser can be fitted at
the right place in the condenser holder and fixed with the adjusting screw. When
doing this, you should be able to read the scale from the front. You should avoid
touching the optical lenses with bare fingers.
For points 6 (Polarisation unit) and 7 (Camera connection), please see Chapter
8 Use of optional accessories.
5
Operation
5.1 Getting started
The very first step is to establish a power connection using the mains plug. You
should first adjust the
dimmer to a low level , so that when you look through the
eyepiece for the first time, your eyes are not immediately subject to a high level of
light. You can now switch on the
lighting using the main switch .
The next step is to place an object holder with the sample on the angle table. To do
this, the cover glass must be facing upwards. You can fix the object holder to the
table using the slide holder
(see illustration on the left) . To move the sample into the
beam path, you must use the adjustment wheels on the right of the angle table (see
illustration on the right) .
You can position a total of two object holders at the same time.