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Agilent 7500 ICP-MS ChemStation Operator’s Manual
Tuning
• Extraction
Select when using ShieldTorch or when running hot plasma without the
ShieldTorch. When selected, Extract 1 lens is set to a negative value for tuning.
• Soft Extraction
This is the autotune mode for reducing background when using the Shield-
Torch. In this setting Extract 1 lens is set to a positive value during tune.
• Cool
This is the autotune mode for cool plasma.
NOTE The Soft Extraction mode and Cool mode become available when the Use
ShieldTorch box is selected. See the “Option Instruction Manual” for the details of
tuning when using the ShieldTorch.
NOTE Quick Tune is useful when there are few changes in the tuning parameters and a
complete autotune is not needed. Quick Tune is not recommended when changing the
autotune mode. (The time taken for autotune when Quick Tune is selected can be
shortened up to 1/3 to 2/3, as compared to the usual mode.)
6 Select Tuning Item from the Item area.
• EM
When selected, autotune automatically optimizes the detector (EM) voltage. In
addition if Adjust Discriminator is selected, Autotune will optimize both the EM
and Discriminator.
Adjusted parameters:
Analog HV, Pulse HV,
Discriminator (when Adjust Discriminator is selected)
• Resolution/Axis
When selected, autotune automatically adjusts the mass axis within a range of +/-
0.05 amu and a resolution at 10% of peak height to between 0.65-0.80 amu.
Adjusted parameters:
AMU Gain, AMU Offset, Axis Gain, Axis Offset
• Torch Vertical/Horizontal Position
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