4
Using the Module
Operational Parameters
Agilent InfinityLab ELSD User Manual
50
Response Time (Smoothing)
The data outputted from the detector can be averaged to produce a smoother
response. The smoothing width is set to the number of data points over which
the data is averaged and can be regarded as a digital time constant. The
smoothing range is settable from 1 – 50, (in increments of 1) which translates to
0.1 – 5.0 s.
For most HPLC applications the default value of 1 (0.1 s) is satisfactory.
For GPC applications where peak widths can be >1 s, a value 50 (5 s) is
recommended.
Light Source Intensity (LED)
The G4260B ELS detector’s LED intensity can be adjusted to bring the peak
response back on-scale. The intensity range can be set between 1 – 100 %, with
the default factory setting being 100 %, for maximum sensitivity. The LED setting
is stored in memory and is retained even after a power on/off cycle.
This feature is useful for preparative chromatography where samples of high
concentration can be analyzed which would otherwise exceed the dynamic range
of the detector.
Power Mode
The instrument can be configured from the front panel submenu (see
on page 45), to start in either
RUN
or
STANDBY
mode when the unit is
switched on via the rear power button.
To configure the Power Mode, select the required Status Mode (i.e.
STANDBY
or
RUN
) you wish the unit to start from the submenu screen (see
on page 45). The selected option will take effect the next time the
module is power cycled. If
RUN
mode is selected as the desired Power mode,
then the instrument will use the operating parameters stored in memory. In the
unlikely event that the instrument encounters a fault during power-up, the unit will
automatically switch to
STANDBY
mode.
NOTE
The Agilent 1260 Infinity II ELSD (G4260B) performs an automatic autozero (i.e.
10 mV) following an LED change, to keep the signal on-scale.
NOTE
The Agilent 1290 Infinity II ELSD (G7102A) Laser light source does not have
power adjustment.
