Agilent InfinityLab LC Series Diode Array Detectors User Manual
87
5
Optimizing the Detector
Optimizing for Sensitivity, Selectivity, Linearity and Dispersion
Sample and Reference Wavelength and Bandwidth
The detector measures absorbance simultaneously at wavelengths from 190 to
640 nm. A UV-lamp provides good sensitivity over the whole wavelength range.
If you know little about the analytes in your sample, store all spectra over the full
wavelength range. This provides full information but fills up your disk space
rather quickly. Spectra can be used to check a peak’s purity and identity. Spectral
information is also useful to optimize wavelength settings for your
chromatographic signal.
The detector can compute and store at run time up to 8 signals with these
properties:
•
sample wavelength, the center of a wavelength band with the width of sample
bandwidth (BW), and optionally
•
reference wavelength, the center of a wavelength band with the width of
reference bandwidth.
The signals comprises a series of data points over time, with the average
absorbance in the sample wavelength band minus the average absorbance of
the reference wavelength band.
> 0.4
8
0.625
0.625
0.625
0.625
> 0.85
16
0.3125
0.3125
0.3125
0.3125
1
Values in the User Interface may be rounded.
Table 18
Peak Width — Response Time — Data Rate (G7117A/G7117C)
Peak width at half
height [min]
1
Response [s]
Scan data
rate[Hz]
≤
251
pts/scan
Scan data
rate[Hz]
≤
501
pts/scan
Scan data
rate[Hz] > 501
pts/scan
NOTE
The maximum spectra scan rate depends on the data points per scan, see
on page 86 and
on page 86. Running at 160 Hz, the spectra
scan data rate is reduced automatically if the spectra scan data rate is more than
251 points/scan.
