Transmittance Measurements - Datacolor 650 User Manual

4. Push the door back to its normal position.

Transmittance Measurements

Three techniques are used to measure the transmittance of samples: "regular"
transmittance, "total" transmittance and "diffuse" transmittance.
When working with samples that are completely transparent (such as dyes in solution or
transparent plastics) you are measuring "regular" transmittance. These samples need to
be positioned close to the lens opening at the back of the transmission compartment:
Lens Opening
Front Back
Measuring the transmittance of translucent samples that contain particles, such as
engineered resins or opal glass, you are measuring either "total" or "diffuse" transmittance.
The samples should be positioned at the front of the transmission compartment, close to
the sphere opening.
Datacolor 650/600/400 User's Guide Sample Presentation and Measurement Overview • 35