5
GENERAL FUNCTIONAL CHECKS
NOTE:
To produce maximum fluorescent contrast, these tests should
be made in a darkened room or in conjunction with a Spectroline
UV viewing cabinet (see Spectroline UV Viewing Cabinets).
1.Activate the TR and TS models by pressing the ‘‘ON’’ switch.
Activate the TC and TL models by turning the timer knob to the
desired exposure time.
2.The UV tubes should become energized and a steady glow of
light should be evident across the filter area. The light may flicker
initially, especially if the unit is cold, but should stabilize after a few
seconds.
DIFFUSING SCREEN IN 312nm AND 365nm MODELS
All 312nm and 365nm models are equipped with a unique diffusing
screen attached to the underside of the UV filter. This screen
ensures excellent irradiance uniformity across the filter area and
eliminates light striations. These two features are especially impor-
tant in photographic applications.
NOTE:
The diffusing screen lowers the overall UV intensity of the
312nm models by approximately 30%, while it reduces the overall
intensity of the 365nm models by approximately 25%. Therefore,
there may be instances when the operator will wish to remove it.
REMOVAL/REPLACEMENT OF DIFFUSING SCREEN
1.Remove the filter assembly as described in Replacing the Filter
Assembly.
2.Carefully place the filter assembly filter-side down on a flat, level
surface, making sure that it does not get scratched.
3.Remove the four screws and lift the diffusing screen off the filter
assembly. If the diffusing screen is going to be used again, store
the screen and screws.
4.Reinstall/replace the diffusing screen by centering its holes over
the screws protruding from the filter assembly. Be sure the metal
frame of the screen is facing
toward
the tubes (light source).
5.Tighten the four screws and reinstall the filter assembly on the
transilluminator.
WARNING
Observe UV safety precautions before turning on the unit.
