MAX300-RTG : Hardware Manual Hardware Maintenance
77
Vacuum Gauge
An ionization pressure gauge is installed above the turbo pump. This device allows
the user to monitor the pressure in the ionizer region of the vacuum chamber
through the control computer software. The ionization type vacuum gauge requires
no regular maintenance. It has a spare filament built in that is selectable with a
switch labeled Filament Select. When both filaments have burned out the gauge
must be replaced.
Remaining Components in the Enclosure
In addition to the vacuum system components, the control electronics are also
mounted in the enclosure, including the Quadrupole Controller (QC), the
preamplifier, and the card cage with its modules.
Resonating the Quadrupole Power Supply (QC)
Required Tools
Voltmeter capable of reading 10VDC (analog type preferred)
Flat Blade Screwdriver
#1 Phillips Screwdriver
Whenever the quadrupole has been removed from the vacuum chamber for
cleaning, the quadrupole power supply will need to be resonated after the system
is running again. This will indicate if a problem has occurred when the quadrupole
was re-installed into the vacuum system as well as insure optimum performance
of the instrument. The resonating procedure can be performed as soon as the
system is running to validate installation. For optimum performance it should be
repeated after the system has been running several hours and all components
have reached thermal equilibrium. Figure 51, below, depicts the quadrupole
controller.
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