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Calculation of the magnification on the monitor
The magnification on the monitor can be cal-
culated with the following formula or measured
with a stage micrometer and a cm scale.
V
TV
= objective magnification x factor of magni-
fication changer* x TV adapter magnification x
monitor diameter
–––––––––––––––––––––
chip diameter of camera
Possible errors
Picture too dim (noisy TV picture, poor contrast)
Remedy: Increase lamp intensity, swing filter out
of light path, switch over beamsplitter in tube
system, switch TV camera to higher sensitivity.
Picture too bright (TV picture glare)
Remedy: Switch neutral density filter, switch
over beamsplitter in tube system, reduce cam-
era sensitivity.
Picture area too small
Remedy: Use a TV adapter with a smaller factor.
Incorrect colour rendering
Remedy: Vary illumination intensity, carry out
white balance for TV camera according to
manufacturer’s instructions, use a conversion
filter, e. g. DLF or CB 12.
Disturbed p icture frame
Remedy: Ground the microscope, Variotube and
camera. Avoid parallel laying of mains and
signal cables; connect camera and microscope
to the same mains phase (socket).
Picture spoilt by inhomogeneous glare and/or
spots. Lamps or windows are reflected in
through the eyep ieces.
Remedy: Switch over the beamsplitter or cover
eyepieces or remove the disturbing light source.
Dirt particles in the light path, lamphousing not
centered (TV systems are generally more
sensitive to inhomogeneous illumination).
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