ChromeGate 3.3.2 Software Manual - KNAUER Advanced Scientific ...

102 Creating an Instrument Control Method
Fig. 150 DAD setup, scan range
This section allows you to specify the scan spectral interval, in nm. The
given range limits are read out from the used instrument. Therefore they
may differ from the shown values.
Start
Enter the start wavelength for the scan, in nm.
End
Enter the end wavelength for the scan, in nm.
Bandwidth
The Bandwidth is the wave length range that will be used to measure a
data point. For the spectral acquisition it is highly recommended to use a
bandwidth of 1 nm.
The scan section limits Start and End are important even if no PDA
option is available. All of the measuring wavelengths in the
Wavelength Program for the used channels 1 to 4 must be within
these limits.
Signal Mode
The active signal mode is already selected in the instrument configuration
(see page 50). The choices are Absorption and Intensity. For the
Kontron DAD 540 it is fixed on Absorption.
Acquire 3D data
You have access to this selection field only with the PDA option.
Wavelength Program
Fig. 151 Detector S 2600 wavelength program table
Used Channel
Check the box(es) to turn the acquisition for the selected channel(s) on. If
the box is not selected, no data will be acquired and no time program will
be executed for this channel. As many channels are activated (at least
one) as many wavelength columns appear in the spreadsheet below.
Bandwidth [nm]
The bandwidth is a measure of the range over which the calculations and
measurements are used to calculate the intensity for a particular
wavelength. For example, with a 10 nm bandwidth, the intensity for 250
nm would be calculated from 245 nm to 255 nm.
A wider bandwidth results in an increased signal to noise ratio because
the multiple measurements cause the random noise to be cancelled out.
That is, if the noise is truly random, more measurements will decrease