Agilent InfinityLab LC Series Diode Array Detectors User Manual
50
3
Using the Module
Method Parameter Settings
Stoptime
/
Posttime
The stoptime is the time where either the complete system
stops (
As Pump/Injector
) or the module (if different from sys
-
tem stop time). The data collection is stopped at this time. A
posttime period can be used to allow module’s items to equili
-
brate (e.g. after gradient change or temperature change).
Spectrum Settings
•
None
•
All
•
Range (from - to)
•
Step width
Analog Output
The range can be set to either 100 mV or 1 V full scale, see
•
Zero Offset
: 1 – 99 % in steps of 1 % (5 % equal to 50 mV).
•
Attenuation
: 0.98 – 2000 mAU at discrete values for either
100 mV or 1 V full scale.
Margin for negative Absorbance
Use this field to modify the detector’s signal handling to
increase the margin for negative absorbance. Use this option
if, for example, your solvent gradient produces a decreasing
baseline absorbance, and for GPC analyses.
Limits: 100 to 4000 mAU.
The higher the value the greater the baseline noise. Set this
value only if you expect negative absorbance greater than
-100 mAU.
Slitwidth
(G7117B): You can select the optical bandwidth (1, 2,
4 or 8 nm) of the detector; the narrower the slit, the smaller the
optical bandwidth of the instrument, but the lower its sensitiv
-
ity. The smaller the optical bandwidth the higher the spectral
resolution.
Slitwidth
The G7117A and G7117C have a fixed slit width of
4 nm.
Autobalance
Defines, whether a balance is performed prior to a run and/or
after a run has finished.
Lamp on required for acquisition
:
If unchecked, the lamp will be turned off after the analysis has
finished. Note that the lamp on requires at least one hour
warm-up time, see
Table 5
Method Parameter Settings
