National Geographic 20X Bedienungsanleitung Seite 15

3. If not, proceed as below. (The maker cannot accept any liability whatsoever in these cases
ghost devices. These are devices not actually currently connected to your computer. The reason
ghost devices appear is that Windows generates a system settings entry for each USB device (e.g.
USB drive) on each port. Windows then seeks that device each time it's started. This slows down
USB device recognition and Windows booting and causes nonrecognition of USB ports. Cleaning
up the system environment and deleting devices that are no longer in use helps here. To do so, right
click 'Workplace' ('Computer' in Vista) and open the 'Properties' menu. Then click the 'Advanced'
tab ('Advanced System Settings' in Vista) and then 'Environment Variables'. Choose the 'New' option.
Enter the following under 'Variable Name': devmgr_show_nonpresent_devices.
Under 'Variable Value' enter '1'. Confi rm your input with 'OK' and then reboot the computer. Change
to the device manager. In the 'View' menu activate the 'Show Devices Option'. The ghost devices
previously not shown will now be displayed in light grey. Check the various categories including USB
and memory size. Only delete entries for devices you no longer use.
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Source: Microsoft Knowledge Base
http://support.microsoft.com/kb/315539/en
3. Working with the Digital Microscope
3.1 Setting the illumination
You do not need any extra electrical cord for the light, because the Digital Microscope gets the electric-
ity for the light via the USB cable. The Digital Microscope offers you three illumination options:
a) surface illumination (light from above),
b) substage illumination (light from below) or
c) surface and substage illumination
(light from above and below at the same time).
Their use depends on the object you would like to observe (see section 3.4). If you press the on/off
button (16) once, the surface illumination (5) will be turned on. If you press the button a second time,
the illumination switches to substage (8). If you then press the button a third time, both surface and
substage illumination are engaged. Another press of the button turns the lighting completely off again.
Choosing the right lighting depends on what you would like to look at (see section 3.4).
3.2 Live Observation
If you press the camera shutter release (2) on your microscope, the 'CamApp' window opens.
If the program 'CamApp' does not start automatically, switch to 'All Programs'. You can start the
'CamApp' program manually under 'USB2.0 PC Camera'.
A live image (in general, blurry) is displayed on the monitor. Focus the live image by turning the setting
wheels for the image sharpness (11).
3.3 Choosing the Magnifi cation Settings
You should begin your fi rst observation with the smallest magnifi cation (20X). This makes adjusting the
image much easier, because the higher the magnifi cation, the more carefully the object of observation
must be positioned (with the transmitted-light microscope, for instance, a slide would be the object of
observation). Therefore, turn the magnifi cation adjustment knob (3) to "20X". Then, adjust the micro-
scope stage (7) to its lowest position using the focus adjustment knobs (11).
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1
EN
). Delete
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