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8
Status display and power switch
Status display and power switch
The MSD has a status display on the lower left of the front of the instrument. It
includes three status LEDs.
Each LED provides information about the status of the MSD. In addition, if power
to the MSD is interrupted, all three LEDs will blink until the data system reestab-
lishes contact with the MSD and downloads the proper information to the HP-IB/
MS control card.
Power status LED
The power status LED lights when the MSD is connected to a power source and
the power switch is on.
Analyzer status LED
The analyzer (ion source, mass filter, and detector) is turned off except when the
MSD is acquiring data or tuning. This helps extend the life spans of the filaments
and electron multiplier horn. The analyzer status LED lights when the MSD
receives the MS ON signal from the data system. The analyzer LED should always
be on during data acquisition or tuning.
Cal valve status LED
The cal (calibration) valve status LED lights when the data system instructs the
calibration valve to open.
Power switch
The power switch is part of the electronics module, and is located on the lower left
of the front of the MSD. It is used to switch the MSD and foreline pump on and off.
& $ 8 7 , 2 1
Do not switch the MSD off unless it has completed the vent program. Incorrect shutdown
can seriously damage the MSD.
250
Electronics
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