3.7 Changing Lenses
Lens assemblies from 0.3X to 4.0X are designed and
factory-adjusted for quick change-out with no need for user
adjustment. The CCD camera is mounted to the housing and
is not attached to the lens assembly. It is not hurt by ambient
light; however, it is vulnerable to dust settling on the CCD
sensor. To avoid dust problems, the CCD sensor should be
protected at all times with a lens assembly in place, except
when changing lenses.
To remove a lens assembly, first gently pull off the surface
illumination ring and place it on the stage, a shown in Figure
7. Then grab the lens assembly by its knurled outer ring and
turn it counterclockwise until you feel that the bayonet fitting
has disengaged. The lens assembly can then be pulled out.
To install a lens assembly, reverse the process. Insert the
lens assembly and turn it clockwise until you feel that the bayonet fitting has engaged. Then slip
the illumination ring back on.
Do not leave the camera unprotected by a lens assembly to minimize dust settling on
the CCD sensor surface.
Do not touch optical surfaces, since oil from your hands can permanently
damage optical coatings.
Place unused lens assemblies in a polyethylene Ziploc bag for dirt protection.
Store unused lens assemblies in a safe place, since they are breakable and
expensive.
3.8
Lighting Control
HDV300 and HDV400 system provide long-life LED lighting for surface and profile illumination.
Lighting levels are adjusted via the system’s M3 software by sliding graphical controls on the
touch-screen.
3.9 Environmental Considerations
HDV300 and HDV400 systems are factory calibrated under the standard laboratory environ-
mental conditions shown below:
20°C ± 0.5°C (68°F ± 1°F)
Temperature rate of change
HDV systems can be safely operated under the following environmental conditions:
Figure 7. Lens change-out.
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