Agilent Technologies 7500 ICP-MS Operator's Manual page 171

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6 Click Run.
7 The message is displayed.
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Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
moving the sample probe of the autosampler. Uptake time and Stabilization time of
the solution can be shortened when the solution washout time is sufficient.
When "0" is entered in the ALS tuning solution vial box, the sample probe does not
move to the Rinse Port after the tuning.
P/A factor tuning starts. After tuning, the P/A Factor Tune Report appears.
When Yes is clicked, the set P/A factor is saved as the current tuning parameter.
When No is clicked, the set P/A factor is not saved as the current tuning parameter.
When the counts of an element are not within the range of 400,000 to 4,000,000 cps,
the P/A factor of that mass will not be set correctly and the P/A factor of the P/A
Factor Report may be reported as follows:
- EM error: need to reduce the sensitivity
(The sensitivity is higher than EM Protection)
- Sensitivity too low: need to increase the sensitivity
- Sensitivity too high: need to decrease the sensitivity
If the P/A factor is used as it is, the P/A factor of that mass is derived by a linear
interpolation between the P/A factors of the two adjacent masses.
If the P/A factor of several elements have error values, please make sure of the
following:
•The signal of the element is within 400,000 to 4,000,000 cps.
•Only select the mass of the major isotope (the element may have more than
one isotope).
When the signal is too high, decrease the sensitivity by adjusting the voltage of the
ion lenses or by using a different concentration for the tuning solution. Tune the P/A
factor again. If the voltage of the ion lenses is changed, please restore these voltages
after P/A factor tuning (the P/A factor is not affected by changing these voltages).
It is also possible to continue the P/A factor tuning until there is no "-1" in the P/A
Factor Report. If you select Merge in the current data and tune the P/A factor again,
the previous P/A factor is adopted even if the mass gives an error this time. When
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