ii
2.5
Rear Panel Familiarization __________________________________________ 21
2.5.1
GPIB Connector_______________________________________________________ 21
2.5.2
RS-232 Connector _____________________________________________________ 21
2.5.3
Input Power Connector _________________________________________________ 21
2.5.4
GND Post____________________________________________________________ 22
2.6
Warm Up and Environmental Consideration ___________________________ 22
3.
Principles of Operation _________________________________________23
3.1
Introduction_______________________________________________________ 23
3.2
Laser Module Theory of Operation____________________________________ 24
3.2.1
Laser Interface ________________________________________________________ 24
3.2.2
Limit DAC ___________________________________________________________ 25
3.2.3
Set Point DAC ________________________________________________________ 25
3.2.4
A/D Converter ________________________________________________________ 25
3.2.5
Current Source Voltage _________________________________________________ 25
3.2.6
Output Shorting _______________________________________________________ 25
3.2.7
Modulation/Voltage Control Input Port_____________________________________ 25
3.2.8
Photodiode Feedback Amplifier __________________________________________ 26
3.2.9
Constant Current, High Bandwidth Mode ___________________________________ 26
3.2.10
Constant Current, Low Bandwidth Mode ___________________________________ 26
3.2.11
Constant Power Mode __________________________________________________ 27
3.3
TEC Module Theory of Operation ____________________________________ 29
3.3.1
TEC Interface_________________________________________________________ 29
3.3.2
Limit DAC ___________________________________________________________ 29
3.3.3
Set Point DAC ________________________________________________________ 30
3.3.4
A/D Converter ________________________________________________________ 30
3.3.5
Sensor Select _________________________________________________________ 30
3.3.6
Difference Amplifier ___________________________________________________ 30
3.3.7
Proportional Amplifier and Integrator ______________________________________ 30
3.3.8
Bipolar Output Stage ___________________________________________________ 31
3.3.8.1
Current Limiting ____________________________________________________ 31
3.3.8.2
Current Limit Condition Sensing________________________________________ 31
3.3.8.3
Voltage Controlled Current Source ______________________________________ 31
3.3.8.4
Voltage Limit Condition Sensing________________________________________ 31
3.3.9
TEC Control Modes____________________________________________________ 31
3.3.9.1
T Mode ___________________________________________________________ 31
3.3.9.2
R Mode ___________________________________________________________ 32
3.3.9.3
I
TE
Mode __________________________________________________________ 32
3.4
Microprocessor Board ______________________________________________ 33
3.4.1
Microprocessor _______________________________________________________ 33
3.4.2
Memory _____________________________________________________________ 34
3.4.3
Serial Interface________________________________________________________ 34
3.4.4
Front Panel Interface ___________________________________________________ 34
3.4.5
GPIB Interface________________________________________________________ 34
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