OBE-1-BA-e-1510
10
5.4 Adjust the brightness
Adjust condenser aperture
Adjust the height of the condenser until the image from the field diaphragm appears
clearly in the visual field. For some microscopes there is a risk that you will lift the
condenser up so high that it collides with the object holder. Care is needed when
doing this.
For each slide, use the
aperture diaphragm
of the condenser to find the very best
compromise between contrast and brightness for the microscopic image. The scale
on the condenser is to be regarded as a recommendation for each lens.
It is possible to alter the brightness of the bulb using the
dimmer
. The brightness is
always controlled by the bulb brightness.
It is possible to re-adjust the focus and x-y axis.
Observe the object.
5.5 Dioptre compensation and focussing
For models with
dioptre setting
:
Keep the eye on the fixed, non-adjustable lens barrel open and close the eye which
is on the adjustable lens barrel. Then adjust the focus for the open eye using the fine
adjustment knob.
Then open the other eye and shut the eye which had been open. Then adjust the
focus for the second eye on the dioptre setting. When doing this, do not touch the
fine adjustment knob.
If necessary,
alter the brake action for the control knobs
using the locking ring.
The rotary knobs on the lefthand side are connected to the rotary knobs on the
righthand side. Please only rotate on one side at a time, do not rotate right and left at
the same time in opposite directions, otherwise this will damage the drive.
Turning the lens revolving unit will bring the lens with the
next magnification level
into position. Make sure that the lens clicks properly into place. When rotating the
lenses, check from the side to make sure that the glass holder does not get damaged
by the lens. Under normal conditions you should be able to select the next lens
immediately and the focus should be roughly at the same level. Make additional
adjustments with the fine adjustment knob. If when you rotate the lens it hits the
object holder, you must first lower the specimen stage and re-adjust it. For lenses
which work with
oil immersion (these are marked with the word “oil”), first put the oil
drops on the slide, bring the lens into position and move it closer to the object holder.
The link between the object holder and lens is the oil. After use or before changing
the slide, remove the oil using a dust-free cloth.
