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8. Operation
tion with the reflector with built-in pol filter. For
this purpose, the coaxial illumination unit must
be inserted completely into the beam path.
In particular, traces on smooth, highly reflective
surfaces appear true-to-detail and contrast-rich
using coaxial illumination.
8.15 Transmitted Light Illumination
The transmitted light illuminator is factory pre-
installed and must be ordered along with the
stand. It cannot be retrofitted later.
The light is guided to the transparent transmit-
ted light object by the cold light illuminator
KL2500 and the double-armed, flexible light
guide with 9 mm diameter. Insert the light guide
ends into the left and right receptacles of the
transmitted light illumination (28.1).
The specimen is illuminated by the collector
lens, the diffusion filter, the mirror, and con-
denser system.
The encoded objective turret recognizes the ob-
jective currently being used, and the condenser
is automatically adjusted to the current objec-
tive magnification.
The light source is centered and yields a
homogeneous object field illumination of up to
55 mm field of vision. The cold light source
KL2500 is used for fine adjustment of the light
intensity.
It can be adjusted electrically and mechanically.
For electrical light control, the color tempera-
ture is changed. For mechanical light control,
the color temperature remains constant.
Note:
The LED (20.9) or (20.11) is green if the corre-
sponding lamp is operated in standard mode. If
the LED is red, the bulb life of the lamp is re-
duced.
The KL2500 can be controlled using the rotary
knobs (20.8 and 20.12).
Please make sure that the KL2500 is connected
with the included cables on the rear side of the
stand.
Likewise, the cable for the condenser lens on
the rear side of the stand must be connected.
Examination with transmitted light illumination is
a valuable tool for detecting evidence of manip-
ulations and forgeries of documents and certifi-
cates, as well as for identifying trace evidence
in textile and material textures, foils, adhesive
tape, etc.
Fig. 28 Transmitted light illuminator
1 Receptacle for light guide with 9 mm diameter
1