During my blank measurement on the BioPhotometer only “++++” appears on the display instead of 0.000 A. What happened?
This is caused by the measurement outside of the upper measuring range (> 3.0 A). Please check 1. Whether your cuvette is pressed firmly onto the base of the cuvette shaft. The error message “++++” indicates that the cuvette base is blocking the light beam. 2. Whether your cuvette has an optical window at 8.5 mm. 3. Whether you have sufficient blank medium in the cuvette.
