16.04.2014 Views

Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Normalize the spectra of standards and unknown samples if you develop or use a<br />

quant method on more than one spectrometer. You should also normalize<br />

noncalibrated spectra; that is, JCAMP-DX spectra, spectra from CSV (commaseparated<br />

values) text files, and spectra collected using dispersive instruments.<br />

The frequency is normalized only if it is not equal to the reference frequency and<br />

the difference between the two is less than 20 wavenumbers.<br />

Important<br />

Note<br />

Normalizing the frequency of spectra guarantees that data points occur at the same<br />

frequency positions. This lets you move data between spectrometers without the<br />

problems associated with inconsistent data point positioning. However, if you plan<br />

to analyze sample spectra using previously calibrated quant methods developed<br />

with a version of OMNIC earlier than 3.0, do not normalize the frequency of the<br />

sample spectra. If you normalize your sample spectra and attempt to use a<br />

calibrated method whose standards were not normalized, the data will not match<br />

and the analysis will fail. ▲<br />

You can use Normalize Frequency in the Collect options to specify whether to<br />

normalize the frequency automatically when you collect a spectrum. See “Collect<br />

options” for details. You can use Normalize Frequency in the Process menu to<br />

normalize the laser frequency of a spectrum already displayed in a spectral<br />

window. See “Normalizing the frequency of a spectrum” in the “Process” chapter<br />

for details. ▲<br />

When you normalize the frequency of a spectrum, a record of the operation is<br />

made in the “DATA PROCESSING HISTORY” section of the Collection And<br />

Processing Information window.<br />

View options<br />

The View options appear when you click the View tab.<br />

The View options let you specify how to display items in spectral windows. The<br />

table below shows what you can specify with each option.<br />

78 Thermo Nicolet

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!