128 Agilent InfinityLab LC Series 1260 Infinity II FLD User Manual
5
Optimizing the Detector
Finding the Best Signal Amplification
Visualization of ADC Limits
Overflow could be concealed by smoothing of a filter and thus not visible for
the user. In the Agilent ChemStation, the "ADC overflow" event was only
shown in the logbook.
This problem did only occur if the Peakwidth (Responsetime) parameter has
been set similar or larger than the real width of the chromatographic peak.
Raw ADC counts
The measured light intensity is limited by the
max range of the ADC-converter.
A filter smoothes the peak making it not clearly
visible that the max intensity is reached. Also
peak area and peak height are distorted which
leads to poor linearity performance.
Note that "max LU" is not a fix number but
depends on the intensity of the reference
channel!
New implementation (with firmware A.06.11
or above)
While any sample value within the filter width
is in state "ADC overflow" the max possible LU
is displayed in chromatogram.
Note that "max LU" is slightly dependent on
lamp drift and lamp noise but strongly
dependent on the excitation wavelength.
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