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Fitting the ATR Crystal Holder to the
Microscope
1. Switch off the microscope at the electricity supply.
2. Stop any laser radiation from entering the microscope by switching the internal beam of
the spectrometer to the internal sample compartment.
For further information on how to do this, see the Spectrum software on-screen Help.
3. Hold the crystal assembly under the upper cassegrain.
Be careful not to change the alignment of the two adjusting levers.
4. Fit the two adjustment thumb-nuts (Figure 30).
The assembly is aligned if the adjusting levers have not been moved.
5. If fitting the automated ATR objective, insert the jack plug into the socket at the rear of
the cassegrain (Figure 31).
Lower the stage if necessary to improve the access to the socket.
6. Direct the infrared beam to your microscope.
7. Switch on the microscope.
ATR crystal holder
Knurled
thumb-nut
Figure 30 The Manual ATR Crystal Holder and Cassegrain
Techniques for Collecting Spectra . 81
ATR cassegrain
Crystal assembly
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