Standard Operation Procedure for APEL PD - 303 UV Spectrophotometer The purpose of this document is to ensure that PD - 303 UV is used in proper way. 1. Turn on the power. 2. The default diagnosis performs self - initializing and self - calibration 3. Instrument function parameters can be edited by press [FUNC]. 4. To change any function press [ENT] the parameter will change automatically. The parameters should be changed according to the experim ent conditions. 5. Measuring mode (Abs., Transmittance, or temperature) can be changed by pressing [MODE] 6. Change wavelength value by press arrows. 7. Measure A or %T; A. Eliminate solvent absorbance by filling the blank solution on the cuvette and press 100%T. B. Measure individually all standards and samples solution, and record the values.