54
IFS 125M User Manual Bruker Optik GmbH
Operation 5
i
If the beamsplitter has been changed, the peak position changes and must therefore be
saved. Select the Advanced Measurement command of OPUS and click the Check Sig
-
nal tab. Then, click the Save Peak Position button.
If you use VIS and UV beamsplitters, the interferometer has to be realigned by the
OPUS Auto Align function as follows:
1. Check signal intensity (chapter 5.6).
2. Once an interferogram is displayed, click the Auto Align button.
➣ If you check Store mode and activated the Spectrum option button, you can
observe the progress visually.
➣ The alignment is most sensitive at high wavenumbers and large apertures. For
example, to align the VIS beamsplitter use a blue or green optical filter and an
aperture of 1.85 mm. Make sure that the detector is not overloaded.
➣ Never use the Auto Align function when no (or only a very small) interferogram is
displayed or when working at low wavenumbers. This may lead to severe mis-
alignment.
3
• Unlock the release lever, move it further up.
• Hold the beamsplitter - with two hands - on
the knobs.
• Carefully remove the beamsplitter straight
upwards without catching an edge.
4 • Hold the beamsplitter - with two hands - on
the knobs and insert the new beamsplitter,
with the electrical contacts facing to the
scanner side. The two guiding pins have to
engage into the slots located on the block.
• Push down the beamsplitter completely, until
you feel resistance.
• Lock the release lever, move it further down.
5 The spectrometer beeps when it detects the new beamsplitter and automati-
cally starts scanning.
• Put on the lid again.
• Use the cross-head screwdriver. Push the screws downwards and rotate
them clockwise.
• Check whether a signal is detected, and the optics works properly. More
details are described in chapter
5.6.
Table 5.5: Changing beamsplitter
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