viii
Voltage Reference......................................................................................................9-47
NPD Amplifier PC Board...........................................................................................9-47
Polarizing Voltage......................................................................................................9-47
Electrometer ..............................................................................................................9-48
A/D Converter Front End Stages.................................................................................9-48
Analog Signal Output .................................................................................................9-49
Voltage Reference......................................................................................................9-49
Bead Voltage Conversion (RMS-to-DC)......................................................................9-49
Pulse Width Modulation Control.................................................................................9-50
NPD Transformer.......................................................................................................9-50
PID Amplifier PC Board.............................................................................................9-51
Polarizing Voltage......................................................................................................9-51
Electrometer ..............................................................................................................9-51
A/D Converter Front End Stage...................................................................................9-52
Analog Signal Output .................................................................................................9-53
Voltage Reference......................................................................................................9-53
Electrometer Balance Adjustment................................................................................9-53
External Amplifier PC Board......................................................................................9-53
Differential Analog Input............................................................................................9-54
A/D Converter Front End Stage...................................................................................9-54
Analog Signal Output .................................................................................................9-55
Voltage Reference......................................................................................................9-55
Pressure Transducer PC Board....................................................................................9-55
Touch Screen Display.................................................................................................9-56
I/O PC Board.............................................................................................................9-56
Timed Event Drivers ..................................................................................................9-56
Position Gas Sampling Valve Interface........................................................................9-57
Analog Inputs ............................................................................................................9-58
D / A & Communications ...........................................................................................9-58
Power........................................................................................................................9-59
Servicing the Electrical System...................................................................................9-59
Accessing the PC Boards............................................................................................9-59
Pressure Transducer Zero Adjustment..........................................................................9-60
Pressure Transducer Span Adjustment .........................................................................9-60
Removing the Pressure Transducer Board....................................................................9-61
Replacing the Gate Array on the Autosampler Control PC Board...................................9-61
Replacing Fuse...........................................................................................................9-61
AC Distribution Board Fuses ......................................................................................9-62
TCD Power Supply Board Fuses.................................................................................9-62
Autosampler Transformer Fuses..................................................................................9-62
Check Resistance Values............................................................................................9-63
Schematics Diagrams .................................................................................................9-64
CHAPTER 10 SCHEMATICS
SCHEMATIC DIAGRAMS................................................................................................... 10-3
Chapter 11 Hardware System
ABOUT THIS CHAPTER..................................................................................................... 11-2
DETECTORS..................................................................................................................... 11-3
Flame lonization Detector (FID)..................................................................................11-3
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