Agilent Technologies 4500 Series Operation Manual page 18

Getting Started
Laser Frequency Calibration test
The Laser Frequency Calibration test measures the frequency (X-
axis) accuracy. The test is conducted by measuring a spectrum of a
polystyrene film. Absorbance frequencies from this spectrum are
compared to frequencies set by NIST SRM 1921 polystyrene film. The
software allows administrative-level users to use the test results to
set the laser calibration. Laser calibrations should only be set after
consultation with an Agilent technical support engineer. For this test,
a background is measured first. After the background collection, a
spectrum of polystyrene film is measured as instructed by the
software. The polystyrene test sample must be pressed firmly against
the diamond sample interface during the sample collection.
18 Agilent 4500 Series FTIR Operation Manual