Item	Purpose
Integration Time	This is how long the computer reads the signal coming in from the spectrometer for at each data point.  Longer integration times reduce the noise on the data, but reduce how fast one can acquire data.
Wavelength Smoothing	Averages absorbance (or transmission) values at nearby wavelengths.  This can help reduce noise in the measurement, but can also lead to distortions of the signal.
Samples to Average	How many individual measurements that the computer will make at each data point and will then average together to get the final value that is displayed.
Wavelength Range	Wavelength (in nm) range over which the computer will record data.  the default setting is the range of the spectrometer, but you can select a narrower range to exclude extraneous data.