2000 MS Hardware Maintenance
30
Functional Description
The Ion Trap Assembly
The Manifold Electronics Assembly
Two boards reside in the enclosure directly atop the Analyzer flange. The
following circuitry, which is critical to the functioning of the ion trap or that must
be in close proximity to the trap, resides on these boards.
•
The electron multiplier power supply, which supplies high voltage (-800
to -3000 Vdc) to the cathode of the electron multiplier.
•
The integrator circuit, which receives the amplified ion current from the
anode of the electron multiplier, converts the current into voltage, e.g.,
10
-7
A into 1.0V, and passes the voltage on to the SAP/Waveboard.
•
The trap filament selection relay.
•
The electron gate control that controls the gate polarity.
•
The axial-modulation low and high frequency transformers.
•
The ion gauge support circuitry, which includes filament On/Off and
selection relays and a log amplifier for gauge read-back signal
conditioning.
