Instrument Performance Validation . 107
When Should I Recalibrate My Instrument ?
When using a Fourier Transform spectrometer, the error in the peak positions will be
proportional to the wavenumber. The calibration can be adjusted by changing the
effective wavenumber of the HeNe laser. If the peak positions in a spectrum collected
from your TRM are not within
±0.3 cm
-1
of those given in the column labelled TRM on the
Certificate of Performance Validation, you should recalibrate your instrument as described
in
Wavenumber Calibration
in the Spectrum on-screen help
NOTE: The reference laser controls the wavenumber scale of the instrument and the
scale is calibrated by measuring the effective wavenumber of the laser. This
differs from the absolute value because the infrared radiation in the
interferometer is not all exactly parallel to the laser beam. A different calibration
is required for the Near Infrared Reflectance Accessory (NIRA) and remote
accessories. Any calibration error will be proportional to the wavenumber value.
You must check the calibration of your instrument if a new source, detector or power
supply has been fitted to your instrument, and recalibrate if necessary.
For recalibration purposes, we recommend that you use the peak at nominally
5669.3 cm
-1
in the column labeled Traceable Reference Material on your Certificate of
Performance Validation.
To Next Page
Loading...
Need help?
General
