Getting Started
Agilent Cary 630 FTIR Spectrometer User’s Guide 21
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. For the Diamond ATR sampling accessory, no sample is
required for a background measurement, but the polystyrene test
sample must be pressed firmly against the diamond sample interface
during the sample collection using the sample press attachment.
Neither the multi-bounce ATR, nor the diffuse reflectance accessory
measurements should be used for the laser frequency calibration test.
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