Agilent InfinityLab LC Series Diode Array Detectors User Manual 49
3 Using the Module
Method Parameter Settings
Table 5
Method Parameter Settings
Signals
Up to 8 individual signals can be set. For each of the signals,
the wavelength and bandwidth can be set for sample and ref-
erence.
Limits:
• Wavelength: 190.0 to 640.0 nm in steps of 0.1 nm
• Bandwidth: 1.0 to 400.0 nm in steps of 0.1 nm
Setting an appropriate reference wavelength could improve
the baseline behavior.
Figure 16 G7117B Peakwitdth Settings
Figure 17 G7117A/C Peakwitdth Settings
Peakwidth (Responsetime, Data Rate)
Peakwidth enables you to select the peak width (response
time) for your analysis. The peak width is defined as the width
of a peak, in minutes, at half the peak height. Set the peak
width to the narrowest expected peak in your chromatogram.
The peak width sets the optimum response time for your
detector. The peak detector ignores any peaks that are consid-
erably narrower, or wider, than the peak width setting. The
response time is the time between 10 % and 90 % of the out-
put signal in response to an input step function. When the All
spectrum storage option is selected, then spectra are
acquired continuously depending on the setting of the peak
width. The time specified by the peak width is used as a factor
in the acquisition of spectra. The acquisition time for one
spectrum is slightly less than the peak width divided by 8,
which is the acquisition time.
Limits: When you set the peak width (in minutes), the corre-
sponding response time is set automatically and the appropri-
ate data rate for signal and spectra acquisition is selected.
Do not use peak width shorter than necessary.
G7117A: Do not use 0.025 s response time (no filtering/high
noise and no need (actually ultra-fast LC doesn't deliver peaks
<0.0025 min/<0.15 s).
NOTE
The G7117A and the G7117C have a data rate of up to 120 Hz.
The G7117B has a data rate of up to 240 Hz.
For details see “Peak width (response time)” on page 85.
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