Shimadzu GC-2010 Plus - Filter Signal Time Constant

13 Detector
13.4
13.
169
GC-2010 Plus
13.4Filter Signal Time Constant
Q Selecting the filter time constant
Normally, analyes can be performed with the time constant set to the default value.
However, in some cases the S/N ratio is improved by changing the time constant.
For example, if the half width of a FID peak is “0.1 sec”, the S/N ratio is maximaized when
the time constant is set to “20 ms.”
Fig. 13.4.1 Relationship between time constant and S/N ratio (FID)
Half width 10 s
Half width 1s
Half width 0.1s
4 ms 5 ms
10 ms
20 ms 50 ms
100 ms
200 ms
500 ms
1s 2s
Time constant
Normalized SN ratio
0
0.2
0.4
0.6
0.8
1
1.2