Fluorescent Measurement; Uv Adjustment; When Fluorescent Calibration Is Performed; When Fluorescent Calibration Is Not Performed - Konica Minolta CM-3700A Instruction Manual

Fluorescent Measurement

The Spectrophotometer is equipped with a UV cutoff filter positioned in front of the pulsed xenon arc lamp.
The position of this filter is controlled by a motor and allows the amount of UV included in the illumination
to be controlled. When the pulsed xenon arc lamp is completely blocked by the UV cutoff filter, all light at
wavelengths below 390 nm is eliminated from the illumination. The position of the filter can also be adjusted
to provide illumination which closely matches CIE illuminant D

UV Adjustment

The position of the filter (and thus the amount of UV included in the illumination)
can be adjusted in 1000 steps, from 0.0 to 99.9% by software.
For the highest possible accuracy when measuring fluorescent specimens, fluorescent
calibration using a standard specimen for which standard values should be performed by
measuring the standard specimen repeatedly and the position of the UV filter adjusted so that
the measured values closely match the standard values. In addition, since the xenon lamp will
age and the light output by the lamp will change over time, it is recommended that fluorescent
calibration be performed periodically if fluorescent specimens will be measured.

WHEN FLUORESCENT CALIBRATION IS PERFORMED

When SpectraMagic™NX is used, the following four fluorescent calibration methods
are available to enable accurate measurement of fluorescent reflectance.
1. Tint mode
Correction coefficients for fluorescent measurement are obtained so that the measured
CIE Tint value for the fluorescent standard plate is within the specified range (Tint value
for the fluorescent standard plate calibrated with a D
2. Whiteness (WI) mode
Correction coefficients for fluorescent measurement are obtained so that the measured CIE Tint
and WI values for the fluorescent standard plate are both within the specified range (Tint and
WI values for the fluorescent standard plate calibrated with a D

WHEN FLUORESCENT CALIBRATION IS NOT PERFORMED

If extremely high accuracy is not required and fluorescent calibration will not be performed, it is
recommended that fluorescent specimens be measured with the UV filter completely removed
from in front of the xenon lamp, allowing 99.9% of UV to be included in the illumination.
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