214 5977B Series MSD Troubleshooting and Maintenance Manual
8 Electronics
Side Board
The side board is mounted on the side plate. It performs these functions:
• Provides the 1 MHz reference clock for the RF amplifier.
• Generates the RF component of the voltage applied to the quadrupole mass
filter according to a signal from the main board. The amplitude of this
voltage is proportional to the mass selected.
• Generates the DC component of the voltage applied to the quadrupole mass
filter. The magnitude of this voltage is proportional to the RF voltage.
• Passes voltages generated on the main board and the detector focus voltage
from the HED power supply to elements in the ion source and the detector.
• Generates and adjusts filament emission current and electron energy as
controlled by the main board.
• Switches the filament power from one filament to the other.
• Monitors for RF faults and shuts down the analyzer if one is detected.
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