Reference Channel

= Reference Channel for Baseline Correction

To perform automatic Baseline Correction of Spectra a reference channel is required.

Any channel, either a physical channel or a channel that was extracted from the 3D field and stored afterward can be used. The wavelength of the channel is variable; i.e., a channel recorded using Wavelength Switching is also valid.

It depends on how the PPA window has been opened which channel is actually used as reference channel in the PPA method:

• If you open the PPA window from the Browser by selecting the Open ... 3DFIELD command, the channel specified in the File or context menu under Properties is used as reference channel.

• If you first open the sample, and then access the PPA window from a different method, the displayed channel is used as reference channel.

To include the current reference channel in the PPA chromatogram window, select the Draw Reference Channel check box, which is provided on the Chromatogram Plot tab page of the Decoration dialog box.

The reference channel serves as a basis for integration and peak detection.

 Tip:

Do not confuse the reference channel with the RefWavelength (Reference Wavelength) of the signals from a photodiode array detector.