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Operation
Page 98
Diode Array/Multiple-Wavelength Detectors (VC-D11, VC-D12, VF-D11)
Operating Manual
Parameters
Description
Bunch width (only
available for the VF‑D11
and VC‑D11 detectors)
If the
3D Field
signal is selected, set the bunch width.
The bunch width setting determines the distance of the
wavelengths between recorded data points in a 3D field.
For each recorded data point, the absorption of a diode
range is averaged (bunched) with the width of the bunch
width. The function of the bunch width in the 3D field is
analogous to the function of the bandwidth in the signal
channel.
The standard
Bunch Width
is set to 4 nm. If required, you
can set a different bunch width. Note that selecting a
higher bunch width will reduce the required data storage
and improve the signal-to-noise ratio, but will also reduce
the spectral resolution.
Autozero
Performs an automatic null balancing. The current
detector signal is interpreted as 0. Therefore, no
absorbing sample should be in the flow cell when
Autozero
is performed.
Leak detection
Leak detection is enabled as a standard when the
detector is shipped (
Leak Sensor
Mode = Enabled
). This is
the preferred setting.
Wavelength validation
Perform the wavelength validation as required. A
holmium-oxide glass filter is moved into the light path and
is used to validate the wavelength accuracy. For further
information, see
Performing a Wavelength Validation and
Wavelength calibration
If the wavelength validation failed, turn on the UV lamp,
leave the VIS lamp (optional) in its current status and
perform a calibration of wavelengths. During the
calibration, the detector determines the measured
wavelength of the D-alpha line of the UV lamp. If the
detector determines that the D‑alpha line differs from the
expected value, the detector will adjust its wavelength
calibration.
For further information, see
.
Lamphouse
temperature
The lamps of the detector are very sensitive to changes in
temperature. The lamp house temperature signal channel
can be used for troubleshooting purposes.
In case of a baseline drift, for example, the lamp house
temperature signal can help to find the reason for the
problem. Select the signal channel in the Instrument
Configuration Manager and the Instrument Method
Wizard to record the temperature. Chromeleon generates
the appropriate channel for recording the temperature of
the detector lamp house.