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Performing 100% calibration
Two methods for performing 100% calibration for
transmittance measurements are possible:
• 100% calibration to air:
When the specimen to be measured is in sheet or solid
form, 100% calibration should be performed with the
transmittance chamber empty.
• 100% calibration to water:
When the specimen to be measured is in liquid form and will be
measured using a cell (optional accessory), 100% calibration
should be performed using distilled (or pure) water in the same
size and type cell as will be used for measurements.
{ Before starting transmittance calibration and measurements, attach the LAV (ø25.4 mm) target mask and
position the white calibration plate at the reflectance measuring port.
{ Before starting transmittance calibration and measurements, set the measurement area to LAV and the
specular component to SCI using the software.
{ Before starting transmittance calibration and measurements, set the same UV light quantity as when
performing measurements using the software.
In the fluorescent measurement that does not require rigorous accuracy (that does not perform fluorescent calibration),
perform measurement under the condition that the UV cut-off filter does not cover the xenon lamp (UV light quantity is 99.9).
After setting up the instrument as described below for your selected 100%
calibration method, perform 100% calibration from your software.
Setting up instrument for 100% calibration to air
Procedure
1.
Open the cover of the transmittance chamber.
2.
Make sure that there is nothing
(specimen, cell, Transmittance Zero
Calibration Plate, etc.) between the
illumination window and the receiving
window in the transmittance chamber.
Memo
• It is no problem that the optional Transmittance Specimen Holder CM-A96 is installed in the transmittance chamber.
3.
Close the cover of the transmittance chamber.
Setting up instrument for 100% calibration to water
Procedure
1.
Open the cover of the transmittance chamber.
2.
Fill the cell with distilled (or pure) water to
approximately 2/3 (when using any of the cells
available as optional accessories) and position
the cell in the optional Transmittance Specimen
Holder installed in front of the illumination
window inside the transmittance chamber.
c Although the Transmittance Specimen Holder can be installed in front of either the illumination
or receiving window, it is recommended that it is installed in front of the illumination window.
In this position, the illumination / observation geometry is diffuse illumination/0° viewing angle.
c The cell used for calibration should be the same type and have the same
optical path length as the cell which will be used for measurements.
c The cell should be positioned in the optional Transmittance Specimen Holder so that
the clear sides of the cell are facing the illumination and receiving windows.
3.
Close the cover of the transmittance chamber.
Illumination
window
Light
22
Transmittance
chamber cover
Receiving
window
Cell or Plastic Cell
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