Operation; Dioptric Compensation; Troubleshooting - VWR VisiScope STB Série Manuel D'utilisation

Operation

Place the specimen on the stage
Place the specimen on the microscope stage and lock the specimen slide using the slide holder if it is neces-
sary. Ensure that the specimen is centred over the stage opening.
Turn on the light
The microscope comes with an electrical illuminator. Insert the plug of the cable into the power socket and
turn on the switch on the main body and select your light source.
Adjust interpupillary distance
Hold the right and left parts of the observation head by both hands and adjust the interpupillary distance by
turning the two parts until one circle of light can be seen. If two circles appear, the interpupillary distance is
too big, and if two overlapped circles appear, the interpupillary distance is too small.
Focus
Rotate the focusing knob to bring the sample into focus with the highest magnification.

Dioptric compensation

This compensation makes it possible for people with glasses to adjust the microscope to their eyes and use
the microscope without glasses. Turn the magnification down to the lowest. Adjust the diopter compensation
ring of the right eyepiece tube until the image of the right eyepiece is clear and sharp. Repeat the procedure
for the left eyepiece.
Working distance
Normal working distance for the standard configuration is 76 mm.

Troubleshooting

Review the information in the table below to troubleshoot operating problems.
PROBLEM
LIGHT DOESN'T TURN ON
IMAGE CANNOT BE SEEN OR
IS DARK.
IMAGE IS UNCLEAR, BLURRED
OR HAS INSUFFICIENT
CONTRAST.
CAUSE
Power supply not connected Check that the power supply cable is
Zoom is too high
Objectives or filters are dirty
Focus is wrong
Dioptric compensation is not
correct
6
SOLUTION
well inserted on the rear of the micro-
scope
Set the lowest zoom magnification in
order to have a brighter image
Wipe them clean
Rotate the focus knobs until you obtain
a sharp image
Adjust the rings under the eyepieces
in order to obtain the same focussed
image with both eyes