Sample And Reference Wavelength And Bandwidth - Agilent Technologies 1100 Series Reference Manual

2 How to optmize the Detector
Table 6
Peak Width
0.01 min
0.02 min
0.05 min
0.10 min
0.20 min
0.40 min
0.80 min

Sample and Reference Wavelength and Bandwidth

The detector measures absorbance simultaneously at wavelengths from 190 to
950 nm. Two lamps provide good sensitivity over the whole wavelength range.
The deuterium discharge lamp provides the energy for the UV range (190 to
400 nm) and the tungsten lamp emits light from 400 to 950 nm for the visible
and short wave near infrared.
If you know little about the analytes in your sample, use both lamps and 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 5 signals with these
properties:
• sample wavelength, the center of a wavelength band with the width of
• reference wavelength, the center of a wavelength band with the width of
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.
36
Peak Width — Response Time — Data Rate
Response Time
0.2 s
0.5 s
1.0 s
2.0 s
4.0 s
8.0 s
16.0 s
sample bandwidth (BW), and optionally
reference bandwidth.
Data Rate
20 Hz
10 Hz
5 Hz
2.5 Hz
1.25 Hz
0.6 Hz
0.3 Hz
1100 Series DAD and MWD Reference Manual