Work Instructions - Betzold 44576 Mode D'emploi

b) Work Instructions
Illumination
The model Betzold Bin-Top 2 is equipped with LED lights. The electricity for the lighting is stored in 3 rechargeable batteries.
The light of the LED bulbs hardly heats liquid specimens. The bulb has an average operating time of 100 000 working hours.
Power supply
The microscope works with rechargeable batteries. One battery charge lasts for about 10 operating hours. The included
recharger can only be connected to a power circuit of 220 Volt. The recharger is protected against overcharging. First
connect the recharger to the microscope, and then connect it to the power circuit. Should the rechargeable batteries totally
be discharged, please recharge them overnight. The batteries can only be recharged when the microscope is switched off.
Should the batteries be defective and need to be exchanged, please contact place of purchase.
Placing the microscope slide
Place the microscope slide provided with an object sample onto the object stage, and fasten it carefully with the help of the
mobile spring clips. By turning the y/y object stage adjustment knobs (at the left under the object stage), you can move the
object to be viewed into the centre of the object stage. Please note that these knobs have two functions: They move the
microscope slide on the object stage forwards and backwards, or from the right to the left.
Adjusting the eye distance and dioptres
The intraocular distance of the binocular top part is adjustable in order to guarantee a comfortable viewing position. This
means that the individual tubes can be adjusted nearer to each other or farther from each other, corresponding to the eye
distance of the user. Move the tubes while looking through, until you get the most convenient picture. You can adjust the
number of dioptres so that you can work without glasses.
Adjusting the image sharpness
Start by viewing your object with a four times magnification. Turn the knob for coarse adjusting until you receive a clear pic-
ture. Then use the knob for fine adjusting to achieve an optimal sharpness. Proceed the same way with every other object.
Pay attention that the object does not touch the objective lens.
Brightness control
There are several ways of adjusting the illumination projected onto the object. Light influences the viewing quality especially
with high magnification. To regulate the illumination LED through the condenser, the blind can be opened or shut. To move
the light beam closer to or farther from the object, the condenser part can be turned up or down with the regulating knob. You
can also adjust the illumination with the dimmer. Adjust the dimmer to its lowest intensity, switch on the current, and increase
the illumination up to the wanted intensity. Use these different possibilities of light adjustment in order to reach a perfect top
view of your object.
c) Work with reflected light: Use of the above light source (For solid objects and for the
observation of surface structures)
Switch the above light on to illuminate the stage. Just as with the work with the transmitted light, always begin with the 4x
objective and increase the magnification accordingly.
Attention!
For the observation of solid objects only the 4x and the 10x objectives are suitable. The 40x magnification is unsuitable for
the use with reflected light due to the necessary distance needed for the focus. For contrast reasons it might be necessary to
place some specimen on a card or a small piece of paper before placing them on the stage. As you are using the light from
above, it is not necessary that the opening in the stage stays open. Furthermore, you avoid your specimen falling through
the hole. This kind of observation makes it possible to magnify countless objects from daily life: e.g. small stones, leaves,
insects, flowers, coins, stamps etc.
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