mild household detergent.
To ensure reliable measurements, it is recommended that the calibration unit is periodically recalibrated to a traceable standard. DELTA Light & Optics offers calibration traceable to PTB
Light trap
Zero signals are simulated by a light trap made of two glossy and black plastic sheets moun- ted in an acute angle. If clean this will provide very efficient light absorbing device.
Rl calibration unit
Light trap
Figure 10. Light trap
It is necessary to disassemble the light trap to clean it efficiently. This is easily done by lifting and pulling it. Cleaning can be done by using a fine brush, clean pressurised air or a soft paper tissue/cloth and some window cleaning liquid.
Pull and lift the upper
Figure 11. Cleaning lighttrap-plate.
DELTA | LTL2000S(Q) Retroreflectometer | 27 |
