CHAPTER
5
.
THEORY
OF
OPERATION
.....................................................................................................................
Introduction 3-1
.........................................................................................
TEC Board Theory of Operation
S-2
....................................................................................
TEC
Digital-Analog Interface S-2
..................................................................................................................
Limit DIA -5-3
.............................................................................................................
Set Point D/A 5-3
............................................................................................................
AD
Converter 5-3
.............................................................................................................
Sensor Select 53
...................................................................................................
Difference Amplifier 5-3
...............................................................................................
Proportional Amplifier 5-4
...................................................................................................................
Integrator -5-4
Bipolar Output Stage
..................................................................................................
5-4
.....................................................................................................
Current Limiting 5-4
.............................................................................
Current Limit Condition Sensing 5-4
..........................................................................
Voltage Controlled Current Source 5-4
.............................................................................
Voltage Limit Condition Sensing 5-5
....................................................................................................
TEC Control Modes 5-5
T Mode
....................................................................................................................
5-5
....................................................................................................................
R Mode 5-5
................................................................................................................
ITE Mode 5-5
.....................................................................................
LASER Board Theory of Operation
5-6
........................................................................................................
Main Processor Board 3-7
...........................................................................................................
Wcroprocessor 5-7
......................................................................................................................
Memory 5-8
..............................................................................
Optically Isolated Serial Interface 3-8
..................................................................................................
Front Panel Interface 5-8
.............................................................................................
Optional GPIB Interface 5-8
..................................................................................
Data Protection at Power-Down 5-8
Front Panel Display and Switch Boards
..............................................................................
5-9
........................................................................................................
D~splay Drivers. 5-10
.......................................................................
................................
Switches
..-........
5-10
.............................................................................................................
LED Drivers 5-10
.........................................................................................................
ADJUST Knob 5-10
..........................................................................................................
Power Supply Board 5-10
.................................................................................................
TEC Power Supplies 5-10
............................................................................................
LASER Power Supplies 5-11
......................................................................
Main Processor Board Power Supplies
5-11
...........................................................................
Front
Panel
Boards
Power Supplies
5-11
...........................................................................................................
Interlock Operation 5-11
......................................................................................................
LASER Interlock 5-11
...........................................................................................................
TEC Interlcok 5-12
.............................................................................................................
Booster Operation 5-12
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