Newport 8000 - Page 10

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4.1 Temperature Controller (TEC) Module______________________________ 45
4.1.1 Introduction ________________________________________________________ 45
4.1.2 Installation _________________________________________________________ 45
4.2 TEC Safety Features______________________________________________ 46
4.2.1 Conditions Which Will Automatically Shut Off the TEC Output________________ 46
4.3 The TEC Connectors _____________________________________________ 46
4.3.1 TEC Grounding Consideration__________________________________________ 47
4.4 TEC Module Operation ___________________________________________ 47
4.4.1 Quick Start _________________________________________________________ 47
4.4.2 TEC Main Screen ____________________________________________________ 47
4.4.3 TEC Setup Screen____________________________________________________ 49
4.4.4 Link Conditions _____________________________________________________ 52
4.5 Sensors _________________________________________________________ 53
4.5.1 Thermistor and Thermistor Current Selection ______________________________ 53
4.5.2 AD590 and LM335___________________________________________________ 58
4.5.3 RTD Sensors________________________________________________________ 62
4.6 TEC Module Theory of Operation __________________________________ 64
4.6.1 TEC Interface _______________________________________________________ 64
4.6.2 Limit DAC _________________________________________________________ 64
4.6.3 Set Point DAC ______________________________________________________ 65
4.6.4 A/D Converter ______________________________________________________ 65
4.6.5 Sensor Select________________________________________________________ 65
4.6.6 Difference Amplifier__________________________________________________ 65
4.6.7 Proportional Amplifier and Integrator ____________________________________ 65
4.6.8 Bipolar Output Stage _________________________________________________ 65
4.6.9 TEC Control Modes __________________________________________________ 66
5. Maintenance__________________________________________________69
5.1 Introduction_____________________________________________________ 69
5.2 Fuse Replacement ________________________________________________ 69
5.3 Cleaning ________________________________________________________ 69
6. Calibration ___________________________________________________71
6.1 Calibration Overview _____________________________________________ 71
6.1.1 Environmental Conditions _____________________________________________ 71
6.1.2 Warm-Up __________________________________________________________ 71
6.2 Laser Calibration ________________________________________________ 71
6.2.1 Recommended Equipment _____________________________________________ 71
6.2.2 Drive Current Load Resistor Selection ____________________________________ 72
6.2.3 Local Operation Current Source (Io) Calibration ____________________________ 72
6.2.4 Remote Operation Current Source (Io) Calibration __________________________ 73
6.2.5 Local Operation I
PD
Current Calibration___________________________________ 74
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