AMERICAN ULTRAVIOLET Lesco SUPERSPOT MK III, Техническое справочное руководство

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KMM1002P
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4.5. Timed Exposure Operation
4.5.1. Toggle Switch
In the Timed Exposure mode, shutter opening is triggered by momentarily depressing the
footswitch and the shutter will stay open for the duration determined by the setting of the
Automatic Shutter Timer. It will close automatically when the set time has elapsed. If
operating in the Timed Exposure mode, make sure that shutter selector switch is in the
"Timer" position. See section 3.2.6.
4.5.2. Cure Cycle Operation
**WARNING**
UV light is hazardous to the eyes and skin. Do not operate the unit without
UV protective goggles and gloves. Make sure no one is exposed to or is
in a position to look at the light emitted from the light guide unless
they are also protected with UV protection goggles.
To expose substrate to a timed dose of UV light, turn the unit ON. Set the automatic timer
to the desired exposure time, as outlined in section 4.1.2. Hold the light-exit end of the
lightguide and depress the footswitch momentarily. The shutter will open, and UV light will
be emitted from light exit port. The shutter will close automatically when the preset time
has elapsed.
4.5.3. Proper Light Exposure
UV light is most effective when it is perpendicular to the work surface; the effectiveness
drops to 50% when the angle of incidence is 60 degrees from the work surface, dropping
to zero when the light only grazes the work surface.
The UV light is emitted from the lightguide exit port in a 60
°
cone. Therefore, the further
away the lightguide is from the work surface, the lower the energy density (milliwatts per
square cm) and the higher the exposure time necessary to achieve the desired results.
Note:
The lamp lifetime depends on the number of times it has been turned ON and
OFF. Turning the lamp ON, and the subsequent warm-up period until the lamp comes to
full power, degrades the lamp considerably more than continuous operation. For best
results, keep the lamp operating throughout the work shift.
Note:
After the lamp has been turned off, it needs to cool down before it can be ignited
again. Allow approximately 2 minutes before one attempts to restrike the lamp.
**CAUTION**
Repeated attempts to restrike the lamp before it has cooled down
sufficiently may damage the power supply.