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The example below shows the parameters for the DNA (260/280) test. For the DNA (260/230) test, Wavelength 2 is set to 230 nm. * DNA (260/280) * TEST NAME WAVELENGTH 1 WAVELENGTH 2 REF. WAVELENGTH CORRECTION DNA FACTOR (λ1) DNA FACTOR (λ2) DISPLAY PROTEIN DILUTION MULTIPLIER UNITS ID# (0=OFF) AUTOPRINT USER PRINT TEST SAVE TEST DNA (260/280) 260.0 nm 280.0 nm OFF 50.00 0.000 NO 1.00 µg/ml 0 OFF STORED TESTS VIEW RESULTS DNA (260/280) test parameters Measuring DNA 1. Display the appropriate DNA parameter screen and enter the initial sample number (ID#). 2. Place the blank in the cell holder. 3. Press Zero/Base to measure the blank. 4. Place the unknown sample in the cell holder. 5. Press Run to start the measurement. The DNA measurement screen is displayed. When the instrument is finished measuring the absorbance of the sample, it displays the absorbance, DNA ratio and DNA concentration similar to the example below. Note Use the arrow keys to display the next or previous page. Spectrophotometer User Guide 57