UltraScan VIS Supplemental Manual for EasyMatch QC ver 2.0
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Note: Closing the transmittance compartment door while making transmittance
measurements is the best practice for this instrument. However, when measuring the
transmittance of liquids that are volatile and/or toxic, it may be more important to
measure the samples quickly than to eliminate ambient room light. To see if leaving
the door open will adversely affect your color measurements, standardize the
instrument in the desired transmittance mode with the transmittance compartment
door closed, then measure either air or a typical sample with the door open and then
with the door closed. Compare the measurements. If the difference is acceptable under
your measurement method, you may measure your samples with the door open. This
test should be repeated if the instrument is moved to a new location.
Sensor > UV Filter Calibration
If the UV option is installed, the instrument is standardized in a mode for which the UV Filter Position is
indicated as Calibrated.
Note: Before calibrating the UV filter, standardize the instrument in the mode
referenced on the label of the fluorescent standard. If the label does not specify a
standardization mode, standardize in RSEX.
UV filter calibration should be performed weekly and after lamp replacement. Once UV FILTER
CALIBRATION is chosen from the SENSOR MENU, the following screen appears.
Figure 27. Calibration of UV Filter: 457 Brightness
Enter the standard’s assigned value into the appropriate box on the UV Calibration screen. This value
has been assigned at the factory if you are using the HunterLab-supplied fluorescent standard. Choose
whether the value is for BRIGHTNESS 457, WHITENESS INDEX CIE (and the illuminant/observer
combination), WHITENESS INDEX GANZ, or Z%. The scale used will be WI Ganz for a HunterLab
standard.
Figure 28. Calibration of WI GANZ
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