Instrument Type:
Detector
Type:
Fixed point value
Value Range:
1.9 ... 197.6 [nm]
Default:
1.9 [nm]
Related Commands:
Description:
The distance between the wavelengths of a 3D field is referred to as BunchWidth. To enhance the Signal-to-Noise Ratio of a Photodiode Array Detector, the signals of several photodiodes can be averaged (or bunched).
Function:
The BunchWidth is closely linked to the concept of bandwidth. For Dionex detectors, the bandwidth is calculated automatically from the BunchWidth. Thus, you do not need to define a bandwidth for the 3D field.
If a detector has 80 photodiodes, for example, distributed on a wavelength range of 160 nm, the (theoretical) optical resolution (= bandwidth) is 2 nm. If the BunchWidth is set to 8 nm, 8 : 2 = 4 photodiodes are averaged to one signal.
Tips:
Averaging the signals improves the signal-to-noise ratio. However, at the same time, Optical Resolution decreases.
For certain instruments, the settings cannot be changed during the sample run. Thus, it may happen that commands included in the branched program are not performed.