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6
Create a SIM Quantitation Method
SIM/Scan Mode Cycle Frequency
98
In SIM/Scan mode, to complete one cycle the MSD acquires a
single group of SIM data followed by a single group of Scan data.
It may be necessary to increase the Scan speed or decrease the
SIM dwell time to achieve the desired number of data points for
effective chromatographic integration. See
Figure 41 SIM/Scan mode
Actual cycle frequency is calculated with the equation in
Figure
42.
Figure 42 SIM/Scan cycle
When switching from the SIM data acquisition mode to the Scan
mode, about 5% of the available run time will be consumed.
For our example, Scan = 2.44 cycles/sec and SIM = 1.97 which
results in an actual cycle time of 1.04 cycles/sec. To improve the
number of data points, we could reduce the SIM dwell time, and
increase the scan speed.
Agilent G1701EA MSD Productivity ChemStation Familiarization Guide
Figure
41.
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