Dead Time Calibration; Appendix C - Agilent Technologies 7500 ICP-MS Operator's Manual

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Agilent 7500 ICP-MS ChemStation Operator's Manual
Appendix

Appendix C

This appendix includes descriptions for the dead time calibration.

Dead Time Calibration

Dead time is the interval following the arrival of an ion at the detector, during which
the counting of a pulse takes place. It is determined by the width of the multiple
output pulse, electronic pulse widths and circuit recovery times. Another ion
arriving during this time will not be recorded.
A typical value of dead time is 40 nsec
Dead time correction is performed in the following calculation.
N = n / (1-nT)
N: Count after correction (cps)
n: Count before correction (cps)
T: Correction parameter (= Dead Time)
Dead time calibration needs to be performed after replacement of the electron
multiplier.
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