Agilent Technologies 7500 ICP-MS Operator's Manual page 183

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Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
selected.
• Sensitivity
For the lower limit, select the Increase Sensitivity box and type the target value
of the lower limit. For the upper limit, select the Decrease Sensitivity box and
type the target value of the upper limit. (e.g. reducing the ArO(56amu) with the
cool mode) If you want to set the sensitivity within a certain range, select both
Increase Sensitivity and Decrease Sensitivity, then set the respective target
values.
• Oxide Ratio
Set the target value, which becomes the upper limit of the oxide ion ratio. Select
the element, which becomes the base of the oxide generation from the mass set in
Torch Position and Lens/Plasma.
• Doubly Charged Ratio
Set the target value, which becomes the upper limit of the doubly charged ion
ratio. Select the element, which becomes the base of the doubly charged ion
generation from the mass, set in Torch Position and Lens/Plasma.
• Background
Set the target value for the upper limit of the background signal that appears even
though the mass filter (Q-pole) stops the ion transmission.
Oxide Ratio, Doubly Charged Ratio, and Background cannot be selected in the Cool
mode.
• RSD Option
When you select the RSD Option, Autotune will tune the instrument while trying
to minimize the RSDs.
The control method of the peripump or the sample introduction system has a large
effect on the RSD. When a sufficient performance can not be obtained, please check
them.
Please ensure that the target values, which are set here, do not exceed the
performance capabilities of the system. In case of setting a value, which exceeds the
performance at times, it may not be possible to obtain sufficient performance.
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