Datacolor 800, 850, 500, and 550 Series User’s Guide 25
Transmittance Calibration
The following accessories are used to calibrate the instrument for transmittance:
White Spectralon® Plaque.
Placed at the
sample port for calibration.
In addition, it is placed at the
port for many transmission measurements. Consult the
standard procedure (ASTM, ISO, etc.) you are following to
determine if this sample should be placed at the port.
Black Card. Used to “block”
the lens during calibration (“zero” calibration).
Barium-coated MAV Aperture Plate
Calibration Procedure
Before you begin, you should verify the current aperture selection. The setting must be
Medium Area View (MAV) and the barium-coated MAV plate (for transmittance measurements
only) should be placed at the instrument port.
NOTE
Transmittance calibration and measurements must be made using the barium-coated Medium
Area View (MAV) aperture plate. This special aperture plate is not used for reflectance
measurements.
To calibrate the instrument for transmittance measurements, do the following:
1. Place the barium-coated MAV aperture plate at the port.
2. Open the transmission compartment and make sure the optical path between the
sphere and the lens is clear.
3. Access the calibration procedure in the program you are running. You may need
to change the selections for the aperture plate, and measurement mode
(transmission). See also the User’s Guide for the program you are running for detailed
instructions to access the instrument setup and calibration options.
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