Agilent Technologies 1260 - Page 124

124 Agilent 1260 Infinity DAD and MWD User Manual
6 How to optimize the Detector
Optimizing for Sensitivity, Selectivity, Linearity and Dispersion
Figure 53 Optimization of Wavelength Setting
A wide bandwidth has the advantage of reducing noise by averaging over a
wavelength range — compared to a 4 nm bandwidth, the baseline noise is
reduced by a factor of approximately 2.5, whereas the signal is about 75 % of a
4 nm wide band. The signal-to-noise ratio for a 30 nm bandwidth is twice that
for a 4 nm bandwidth in our example.
Figure 54 Influence of Bandwidth on Signal and Noise
GZ[ZgZcXZWVcYl^Yi]&%%cb
GZ[ZgZcXZlVkZaZc\i](+%
6c^h^XVX^Y
LVkZaZc\i]cb
6WhdgWVcXZb6J
hVbeaZlVkZaZc\i]'*'cb
(%cb
WVcYl^Yi]
7VcYl^Yi]
(%cb
&'cb
)cb