1100 Series DAD and MWD User Manual 81
Using the Detector 4
Table 15 Spectrum Settings
Store Defines at which points on “signal A” spectra will be taken and saved.
Signal A is used to control the “peak controlled spectra acquisition”; the
other signals have no influence on spectra acquisition.
None No spectra are taken.
Apex + Baselines Spectra are taken at the apex and baselines of the peak.
Apex + Slopes +
Baselines
Spectra are taken at the apex, baselines, upslope, and downslope of the
peak.
All in Peak All spectra within the peak are taken.
NOTE
Note:
The three spectra acquisition types mentioned above are also referred to
as peak-controlled spectra acquisition. The peak detection is done by the
detector firmware based on the threshold and peakwidth parameters you
set for the DAD. If you want to use peak-controlled spectra storage, make
sure that you set these parameters to recognize all the peaks of interest.
The integration algorithm also includes peak detection based on the
threshold and peakwidth parameters set in the integration events.
Every 2nd spectrum Spectra are taken continuously as for All, but only every second spectrum
is stored; other spectra are discarded. This reduces the amount of data
storage necessary.
All Spectra are taken continuously depending on the setting of the
Peakwidth. Eight spectra are acquired per Peakwidth. The acquisition
time for one spectrum is slightly less than the Peakwidth divided by 8,
that is, greater than or equal to 0.01s and less than or equal to 2.55s.
NOTE
Note:
If there are no peaks in Signal A, there are no spectra. You cannot process
spectra present in other signals.
Range Range defines the wavelength range for spectral storage.
Limits: 190 to 950 nm in steps of 1 nm for both low and high values. The
high value must be greater than the low value by at least 2 nm.
Step Step defines the wavelength resolution for spectral storage.
Limits: 0.10 to 100.00 nm in steps of 0.1 nm.
Threshold: The threshold is the height in mAU of the smallest expected peak. The
peak detector ignores any peaks which are lower than the threshold
value and does not save spectra.
Limits: 0.001 to 1000.00 mAU in steps of 0.001 mAU. Usable for modes
Apex + Baselines, Apex + Slopes + Baselines and All in Peak
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