Specifications

10-16 Description of Schematics
SRS Residual Gas Analyzer
multiplier output is compared to the set level (HV_SET) by an error amplifier (U800A)
which controls the voltage on the center tap of the primary via Q800. The primary current
in the HV inverter is sensed by R814, a 2.2: resistor. If the primary drive exceeds 230
mA, the output of the difference amplifier U800B will go positive, reducing down the
primary drive level.
The HV power supply piggy-backs off the vertical interconnect PCB in between the top
and bottom PCBs. The HV power supply will only be installed in units which are ordered
with the channel electron multiplier option.