Compaq Aero 2150 Betriebsanweisung PDF herunterladen (Seite 23)

Drift Correction

Over time, the detected light from a source fluctuates or drifts. For extended experiments, you achieve the

best results if you can take frequent reference spectra. However, for those of you who cannot afford that

luxury, you can choose to monitor the light source and OOIPS2000 will correct for any drift that might occur.

The region you choose as the reference area must be in a non-absorbing region of the sample (for absorbance

measurements) or in the 100% transmission region of the sample (for transmission measurements).

Enable

To correct for variations in spectral intensity due to light

source and system drift, choose

Spectra | Drift Correction |

Enable

from the menu.

Configure

To set the parameters for correcting drift, select

Spectra |

Drift Correction | Configure

from the menu.

•

Enable Drift Correction.

Enable this function to

correct for variations in spectral intensity due to light

source and system drift. This functions is the same as selecting

Spectra | Drift Correction |

Enable

from the menu.

•

Non-absorbing Wavelength (nm).

Choose a wavelength as the midpoint of your reference area.

The region you choose as the reference area must be in a non-absorbing region of the sample (for

absorbance measurements) or in the 100% transmission region of the sample (for transmission

measurements). Also, try not to select a region that has low scope mode intensity. For the best

results, make sure that the scope mode intensity of the region that you are using as your reference

is at least 15% of the peak intensity.

•

Bandwidth (nm).

Select the total bandwidth of the reference area. In the picture above, for

example, a bandwidth of 10 means that the region from 10 nm below the wavelength of 700 to

10 nm above the wavelength of 700 is the monitoring region.

Scale

Autoscale

To adjust the scale of a spectrum such that its entire Y axis fills the display area, click the

autoscale icon or select

Spectra | Scale | Autoscale

from the menu.

Set Scale

To open the Set Scale dialog box allowing you to specify the minimum and maximum limits of

both the wavelength (X axis) and amplitude (Y axis), click the set scale icon or select

Spectra | Scale |

Set Scale

from the menu.

Unscale

To reset the scale of a spectrum such that the default scale fills the display area, click the unscale

icon or select

Spectra | Scale | Unscale

from the menu.

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