Varian ProStar 325 UV-Vis, Service Manual

Page: 134 / 149

ProStar325 Service Manual
134
Publication date 8 May 2003
Clicking on “Load” will display the current EEPROM information
for the detector you are connected to. This can be done
individually in a specific group of information, such as Lamp
Details, or you can click “Load All” to display the entire contents.
To make an entry into the EEPROM, enter in the desired
information into the appropriate field and click on “Update”.
Wavelength Calibration Parameters – (slope) this is a
correction factor that is mathematically applied to help maintain
wavelength accuracy of the optics. It eliminates any inaccuracies
in wavelengths caused by mechanical errors such as grating
squareness. The D2 emission line at 656.1nm is a strong signal
and is well characterized. It is widely used in UV-Vis
spectroscopy as an accurate wavelength marker. The detector
performs a search for this emission line, and then does a search
for 0nm. A correction factor is then applied between these two
points. This will ensure that these two points are accurately
identified and ‘placed’ in their correct spectral position. All
wavelengths can therefore be deemed as accurate.
A typical slope value would be around 1.01.
Configuration Options - Updating detector models to dual a
wavelength option is performed on this page. You will require the
code supplied when purchasing the appropriate upgrade kit to
complete this task.
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