X-Rite Ci7860 Series - R;T (Reflection;Total Transmission) Measurement

Ci7XX0 BENCHTOP SPECTROPHOTOMETER
30
7. Once properly position, tighten the thumb screws and close the transmission cover.
8. Initiate the measurement by selecting “Measure Standard" or "Measure Trial" from your
software application, or press the Standard or Trial button on the front panel.
9. The measurement is taken. The data is displayed in your application.
10. Follow the instructions for saving the data in the application.
R/T (Reflection/Total Transmission) Measurement
R/T measurements provide the ability to compensate for light lost through the sample (as opposed
to light absorbed). When using R/T mode for plastic formulation the formulation software will
attempt to match opacity of the standard as well as color.
Two measurements are taken to create this value. One measurement is taken with the sample
positioned at the reflection port (reflection measurement). The second measurement is taken with
the sample positioned flush against the stop at the back of the sphere (total transmission
measurement). When measuring with this method the diffuse light travels through the object from
all angles. Again the sample is illuminated from all possible angles with a diffuse light source.
1. Mount the aperture plate (with white reflective ring) to the measurement port at the front of
the instrument.
2. Position the transmission white plaque on the sample holder as previously explained in the
calibration section.
3. Position the sample at the reflection port as previously explained in the Reflectance
Measurement section.
4. Initiate the measurement by selecting “Measure Standard" or "Measure Trial" from your
software application, or press the Standard or Trial button on the front panel. The
measurement is taken.
5. Open the transmission cover by lifting up on the locking pin while sliding the cover to the back.
Transmission holder
with sample at the lens
(direct measurement)
for 25 mm
measurements