Cirrus SP101013.111 – 10 October 2012
MKS Instruments UK Ltd., Spectra Products
25
6.3 Starting the Quad
Ideally you want the pressure to reach 2x10
-5
Torr before switching on a filament on the quadrupole.
The trip contact on the cold cathode gauge is connected to the external trip on the RGA control unit to
prevent filament operation until the pressure falls below this level.
6.4 Baking
Before you can start to use the system properly, it will need to be run for sufficient time to allow the
background peaks to drop. This amount of time can be significantly reduced by baking the system.
This should be done after the system has run for at least an hour to allow the pressure in the system
to drop below 2x10
-5
Torr.
From the Heat/Bake pull-down list, choose the Bake option. A dry, inert gas should be flushed
continuously through the capillary inlet during bake out. The quadrupole should be running with the
filament on but only using the faraday detector.
The multiplier detector will be unavailable during baking
