Extending the Dynamic Range Using Pulse-Only Mode

EXTENDING THE DYNAMIC RANGE USING PULSE-ONLY MODE 

FIGURE 11.5 The pulse counting mode covers up to 10 cps, while the analog circuitry is suitable from lO to 10 cps, with a dual-mode discrete dynode detector. (From E. R. Denoyer, R. J. Thomas, and L. Cousins, Spectroscopy, 12[2], 56-61, 1997. Covered by U.S. Patent Number 5,463,219.) 

There are basically three ways of implementing this technology based on the types of samples being analyzed. It can be run in conventional pulse-only mode for 

Practical Guide to ICP-MS A Tutorial for Beginners, Second Edition 

There are basically three ways of implementing this technology based on the types of samples being analyzed. It can be run in conventional pulse-only mode for normal low-level work. It can also be run using an operator-selected attenuation factor if the higher-level elements being determined are known and similar in concentration. If the samples are complete unknowns and have not been well characterized beforehand, a dynamic attenuation mode of operation is available. In this mode, an additional premeasurement time is built into the quadrupole settling time to determine the optimum detector attenuation for the selected dwell times used. 

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