Bomem-GRAMS User's Guide

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Section 4.1 Description Threshold determines the maximum value (in percentage) of the ratio of the average amplitude in the Spectral Range against the maximum spectrum amplitude. If the ratio is greater than the threshold value, a saturation warning is given to the user and put in the audit log (see Appendix C on page 45). • Use Default restores the default values. 4.1.2 Align The Align command is used to display a spectrum or interferogram that is updated after each scan of the spectrometer. This is useful to adjust accessories for maximum throughput and to check if the signal intensity is acceptable. A readout of the ZPD amplitude as a percentage of the maximum allowed ZPD is also provided. When the Align command is selected, Bomem-GRAMS switches to the page used for alignment and the Align dialog box appears. Align This dialog box is used to set align parameters before data acquisition is started. • Spectral Range Start and End define the displayed spectral region. • Show Scan direction allows showing the scans in one direction only (direction 0 or direction 1), or in both directions simultaneously. • Data type determines the type of data that will be displayed. IGram: raw interferogram Single-Beam: single-beam spectrum 22 Bomem-GRAMS User's Guide
Chapter 4 The Collect Menu f For transmittance spectrum and absorbance spectrum a background file is required. %Trans: transmittance spectrum f Absorb: absorbance spectrum f Background: the name of the current background (reference) file. • OK Align begins data acquisition. During this data acquisition, the display (see Figure 4-2 below) is continuously updated until the Halt Collect command (see Section 4.1.5 on page 29) is selected. No data is saved when using the Align command. 1 2 8 7 6 5 3 4 Figure 4-2. Align display Bomem-GRAMS User's Guide 23
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