To Perform A Pci Autotune (Methane Only) - Agilent Technologies 5977B Series Operating Manual

To Perform a PCI Autotune (Methane Only)

Always verify MSD performance in EI before switching to CI operation. Always set up
C A U T I O 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 Verify that the MSD performs correctly in EI mode first. (See
2 From the Tune and Vacuum Control view, load the PCICH4.U tune file or an
3 Accept the default settings.
4 Perform methane setup. (See
5 Under the Tune menu, click CI Autotune.
There are no tune performance criteria. If autotune completes, it passes. (See
Figure 44
you may not be able to acquire data successfully if your method sets EMV 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.
5977B Series MSD Operating Manual
System Performance"
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.
page 130.)
on page 136.) If the tune sets the EMV at or above 2,600 V, however,
"PCI autotune report"
on page 108.)
"To Set Up Methane Reagent Gas Flow"
on page 136.)
Operating in CI Mode
"To Verify EI
on
5
135