Agilent Technologies 5977B Series Operating Manual page 103

Operating in EI Mode 4
If the pressure is consistently higher than those listed, refer to the online help
in the Agilent MassHunter GC/MS Acquisition software for information on
troubleshooting air leaks and other vacuum problems.
In the Instrument Control view, you can set up an MSD Monitor for displaying
this vacuum reading. The vacuum can also be read on the 7890A+ or 7890B GC
series control panel or from the Manual Tune screen.
5977B Series MSD Operating Manual 103