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8 Electronics
Back panel and connectors
High vacuum signal (HIVAC SIGNAL) connector
The high vacuum signal connector is on the ac board, extending to the back panel.
The high vacuum signal cable carries control signals to the turbo controller from
the ac board, and high vacuum pump status information to the ac board. This
cable also carries control and power to the calibration valve and the high-vacuum
cooling fan.
High vacuum power (HIVAC POWER) connector
The high vacuum power connector carries power for the diffusion pump heater or
the turbo controller. The high vacuum power jumper connects the ac board to the
high vacuum power connector.
Power cord receptacle
The ac power cord brings in all electrical power for the MSD. The power cord can
be detached from the MSD. The ac power receptacle is on the ac board, extending
through the back panel.
Foreline pump power cord receptacle
The foreline pump power cord receptacle provides ac power for the foreline pump.
If the power switch is off, no power is supplied to the foreline pump. The ac power
receptacle is on the ac board, extending through the back panel.
Primary fuses
The primary fuses limit current into the MSD in case of a short circuit in the fore-
line pump. The primary fuses are on the ac board, extending through the back
panel.
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