To align the spectrometer:
1. Remove any sample or accessory from the sample
compartment (except a transmission sample holder).
The beam path must be clear during alignment. Open the sample
compartment as briefly as possible to maintain a constant purge.
2. Choose Experiment Setup from the Collect menu or the
toolbar.
The Experiment Setup dialog box appears.
3. Make sure Sample Compartment on the Bench tab is set to
Main.
4. Set Gain on the Bench tab to 1.
Important
Do not use Autogain.
S
5. Click the Align button on the Diagnostic tab.
When you click the Align button, the system begins to optimize
the detector signal for maximum energy throughput. Alignment
should take 2 to 4 minutes.
The live display of the detector signal changes as each
interferogram is collected. The positive peak and negative peak
intensities are shown next to Max and Min above the live
display. The interferogram location will be shown next to
Location (unless Single Beam is selected on the Bench tab).
6. When the alignment is finished, close the Experiment Setup
dialog box.
Nicolet FT-IR User’s Guide 131
