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Troubleshooting and Maintenance Guide
14
Electronics
•
Supplies and controls the power for the ion source and
quadrupole (mass filter) heaters.
•
Provides 24 VDC power for the cooling fans.
Signal amplifier board
The signal amplifier board amplifies the output of the detector.
It produces an output voltage of 0 to 10 volts DC, proportional
to the logarithm of the input current of 3 picoamps to
50 microamps.
An analog-to-digital converter converts the amplifier output
voltage to digital information. The LAN/MSD control card
converts the data into abundance counts proportional to the
detector signal current.
MSD AC board
The MSD AC board is mounted on the opposite side of the MSD
electronics panel from the LAN/MSD control card. The AC
board is also sometimes called the power distribution/vacuum
control board. It performs these functions:
•
Provides input voltage transparency for the MSD.
•
Distributes AC line power to the AC/DC power supply, the
foreline pump, and the turbo pump controller.
•
Turns the calibration valve on or off as directed by the main
board.
•
Provides the voltage for the calibration valve.
•
Provides a logic interface to turbo controller.
•
Passes the turbo pump speed and other vacuum status
information to the main board.
•
Turns off the foreline pump in case of a problem with
pumpdown.
Turbo pump control
Your instrument is equipped with a turbo pump with an
integrated controller.
The MSD AC board sends control signals to, and receives turbo
pump status information from, the turbo pump controller. The
turbo pump controller provides power to the turbo pump and
regulates pump speed. If the pump fails to reach 80% speed
within 7 minutes after beginning pumpdown or if the speed
drops below 50% during operation, the controller shuts off the
turbo pump and the AC board shuts off the foreline pump.
Содержание 5975T LTM GC/MSD
Страница 1: ...Agilent Technologies Agilent 5975T LTM GC MSD Troubleshooting and Maintenance Guide...
Страница 10: ...10 Troubleshooting and Maintenance Guide...
Страница 32: ...32 Troubleshooting and Maintenance Guide 2 Concepts and General Tasks...
Страница 72: ...72 Troubleshooting and Maintenance Guide 3 Chromatographic Symptoms...
Страница 86: ...86 Troubleshooting and Maintenance Guide 5 ALS Symptoms...
Страница 98: ...98 Troubleshooting and Maintenance Guide 7 Instrument Power On and Communication Symptoms...
Страница 108: ...108 Troubleshooting and Maintenance Guide 9 Troubleshooting Tasks...
Страница 150: ...150 Troubleshooting and Maintenance Guide 10 General Maintenance Figure 16 Replacing filaments Filament 1 Filament 2...
Страница 166: ...166 Troubleshooting and Maintenance Guide 10 General Maintenance...
Страница 214: ...214 Troubleshooting and Maintenance Guide 13 Analyzer...
Страница 239: ...Parts 15 Troubleshooting and Maintenance Guide 239 Figure 39 LCP replacement parts LCP assembly and fascia...