To Perform A Pci Autotune (Methane Only) - Agilent Technologies G7035A Operation Manual

To Perform a PCI Autotune (Methane Only)

Always verify MSD performance in EI before switching to CI operation. Always set up
CA UT IO N
the CI MSD in PCI first, even if you are going to run NCI.
Avoid tuning more often than is absolutely necessary; this will minimize PFDTD
background noise and help prevent ion source contamination.
Procedure
1
2
3
4
5
There are no tune performance criteria. If autotune completes, it passes (See
Figure 18
(EMVolts) at or above 2600 V, however, you may not be able to acquire data
successfully if your method sets EMVolts to "+400" or higher.
The autotune report contains information about air and water in the system.
See
The 19/29 ratio shows the abundance of water.
The 32/29 ratio shows the abundance of oxygen.
5977 Series MSD Operation Manual
Verify that the MSD performs correctly in EI mode first. See
System Performance"
Load the PCICH4.U tune file or an existing tune file for the reagent gas you
are using.
If you use an existing tune file, be sure to save it with a new name if you do
not want to overwrite the existing values.
Accept the default settings.
Perform methane setup. See
page 104.
Under the Tune menu, click CI Autotune.
on page 112). If the tune sets the electron multiplier voltage
"PCI autotune report"
Operating in Chemical Ionization (CI) Mode
on page 71.
"To Set Up Methane Reagent Gas Flow"
on page 112.
4
"To Verify
on
111