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Model 8000/8008 Modular Controller

1. 6 3 TEC Calibration 6 3 1 6 3 2 6 3 3 6 3 4 6 3 5 6 3 6 6 3 7 6 3 8 6 3 9 6 3 10 6 3 11 6 3 12 6 3 13 Recommended Equipment Local Operation Thermistor Calibration Remote Operation Thermistor Calibration Local Operation AD590 Sensor Calibration Remote Operation AD590 Sensor Calibration Local Operation LM335 Sensor Calibration Remote Operation LM335 Sensor Calibration Local Operation RTD Calibration Remote Operation RTD Calibration RTD Lead Resistance Calibration Offset Null Local Operation ITE Current Calibration Remote Operation ITE Current Calibration Single Channel TEC Modules Remote Operation ITE Current Readback Calibration Dual and Combo TEC Modules 85 7 Factory Service 7 1 Introduction 7 2 Obtaining Service 8 Error Messages 8 1 Introduction 9 Specifications 9 1 Model 8000 Modules 9 1 1 9 1 2 9 1 3 9 1 4 9 1 5 8540M MOPA Laser Diode Driver Module 89 89 89 93 93 Temperature Controller TEC Dual TEC Module Specifications Laser Diode Driver LDD Modules Dual Laser Diode Driver LDD Modules Combo Module Laser Diode Driver LDD Section 9 2 Model 8008 Modules 9 2 1 9 2 2 Dual Laser Diode Driver LDD Modules Combo Module Laser Diode Driver LDD Section 9 3 Mainframe And General Specifications Tables Table 1 Laser Connector Pinouts Table 2 MOPA Laser Connector Pinouts
2. lt 0 02 0 20mA 0 02 0 004 1 uA 0 to 5 Volts 0 to 6 000 0 0 1 0 02 200 pA 0 000 to 5 000 0 1 0 005 0 3 mV 15 20 000 0 1 0 01 1 pA 0 00 to 600 00 0 01 0 00 to 6000 0 0 01 Chapter 9 Specifications 101 9 1 4 Specifications Laser Output Output Current Range mA Output Current Resolution mA 16 bit Output Current Accuracy Compliance Voltage Temperature Coefficient Full Scale Short Term Stability 1 hr Full Scale Long Term Stability 24 hr Full Scale Noise Ripple rms Current Limit Range Resolution Accuracy Photodiode Input Range Stability Full Scale 24 hours Accuracy Temperature Coefficient Full Scale C Photodiode Reverse Bias Measurement Display Output Current Range mA Output Current Resolution mA Output Current Accuracy Forward Voltage Range Volts Forward Voltage Resolution mV Forward Voltage Accuracy Photodiode Current Range uA Photodiode Current Resolution uA Photodiode Current Accuracy PD Resp Range uA mW PD Resp Resolution uA mW Optical Power Range mW Optical Power Resolution mW 8501D 0 to 100 mA 0 0015 0 03 5 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 uA 0 to 100 mA 1 mA 2 mA 0 5mA m 0 02 0 004 0 5 LA lt 0 02 none 0 to 100 00 0 01 0 02 10 uA 0 000 to 5 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to
3. lt nrf value gt via the TEC R lt nrf value gt command If at any time prior to TEC R a command other than TEC R or TEC R is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s Once the TEC R value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command RTD Lead Resistance Calibration Offset Null Because the RTD sensor reflects changes in temperature with small changes in resistance even a small lead resistance resistance caused by the wire running between the TEC module and the RTD sensor can cause significant temperature offset The lead resistance may be taken out of the RTD reading as follows a With the TEC output off short the sensor wires as close to the RTD sensor as possible Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC sensor calibration mode by pushing pressing the RTD Null soft key Follow the on screen in
4. Dual Temperature Controller TEC Laser Diode Driver LDD Dual Laser Diode Driver MOPA Laser Diode Driver Combination LDD TEC Chassis Ground GPIB Connector RS232 Connector Power Requirements Size H x W x D Mainframe Weight Modules Weight Operating Temperature Storage Temperature Laser Safety Features Isolation Mainframe And General Specifications LCD graphics display 240 W x 128 H pixels Green LED Brightness and Contrast contrast optimizes viewing angle Green LASER ACTIVE LED indicates that at least one Laser Diode output is on and the LCD graphics shows details of active channels 15 pin female D sub Two 15 pin female D sub 9 pin female D sub BNC external Modulation BNC auxiliary photodiode input Two 9 pin female D sub 15 pin high density female D sub 9 pin male D sub 9 pin female D sub LDD and 15 pin female D sub TEC 4 mm Banana Jack 24 pin IEEE 488 One 9 pin male D sub 90 to 132 volts 5 Amp Max 198 to 250 volts 2 5 Amps Max user selectable 50 to 60 Hz 133 mm x 426 mm x 356 mm 5 25 x 16 75 x 14 14 3 kg 31 5 Ibs 1 1 kg 2 5 Ibs typical weight each 0 to 40 C lt 70 relative humidity non condensing 20 C to 60 C lt 90 relative humidity non condensing Laser Enable Key switch Interlock Output Delay meets CDRH US21 CFR 1040 10 Interlock and output delay are part of the Laser Module All modules electrically isolated with respect to each other and from
5. Optional Sync Out TTL CMOS level Photodiode Input Range Stability Full Scale 24 hours Accuracy Temperature Coefficient Full Scale C Photodiode Reverse Bias 10 Measurement Display Output Current Range mA Output Current Resolution mA Output Current Accuracy Forward Voltage Range Volts Forward Voltage Resolution mV Forward Voltage Accuracy Photodiode Current Range uA Photodiode Current Resolution uA Photodiode Current Accuracy PD Resp Range uA mW PD Resp Resolution uA mW 8605 0 to 500 mA 0 0076 0 03 15 pA 7 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2pA 0 to 500 mA 1 mA 2 mA Sine and square wave 200 Hz to 2 kHz 200 Hz to 2 kHz 200 Hz to 2 kHz 2 kHz to 300 kHz 2 kHz to 300 kHz 2 kHz to 300 kHz 50 50 50 Imax gt Imin Imax gt Imin Imax gt Imin lt 1 rms lt 1 rms lt 1 rms x 5 or 5 T 5 2 5 pe 5 ae 5 lt 2 lt 2 lt 2 lt 500 ns lt 500 ns lt 500 ns Sine and square zero crossing sync 0 5mA 0 5mA 0 20mA 0 02 0 02 0 02 0 004 0 5 pA 0 004 0 5 uA 0 004 1 pA lt 0 02 lt 0 02 lt 0 02 0 to 5 Volts 0 to 5 Volts 0 to 5 Volts user specified 0 to 500 0 0 01 0 02 20 pA 0 000 to 7 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 8610 0 to 1 000 mA 0 0153 0 03 30 pA 7 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt
6. s calibration constants the actual laser diode temperature is displayed in C on the front panel Full Feature LDD Modules Offer Complete Test and Characterization Capabilities Advanced circuit designs and careful layout of 8500 series modules provide you with an extremely low noise highly stable output current Current outputs range from 200 mA to 6 Amps An external analog modulation input allows precision control of the laser output for a variety of applications including power level control and wavelength tuning A monitor photodiode may be zero biased for CW low noise applications or reversed biased up to 5 volts for high frequency modulation All laser diode parameters are accessible with 16 bit resolution including the laser diode s forward voltage for full characterization using any of the 8500 series modules Dual modules have all the same features except for external modulation and offer two independent channels in one module Chapter 1 General Information 3 Combination LDD TEC Modules Offer Full Laser Control In A Single Package When temperature stabilization is required the 8600 series Combination LDD TEC module gives you full control of your laser diodes The TEC section temperature stabilizes your laser diode On the LDD section an internal function generator provides sine and square wave modulation Comprehensive Safety Features Protect Your Laser Diode Time tested laser diode protection safety features are incor
7. 0 5mA me 0 02 0 004 0 5 pA lt 0 02 0 to 5 Volts user specified 0 to 100 00 0 01 0 02 10 pA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 100 00 17 18 reading fixed error 8605 8C 0 to 500 mA 0 0076 0 03 15 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2pA 0 to 500 mA 1 mA 2 mA Sine amp square wave 200 Hz to 2 kHz 2 kHz to 300 kHz 50 Imax gt Imin lt 1 rms 2 5 S lt 2 lt 500 ns zero crossing sync 0 5mA 0 02 0 004 0 5 pA lt 0 02 0 to 5 Volts user specified 0 to 500 0 0 01 0 02 20 uA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 500 00 True rms 3 Hz to 300 kHz FS resistive load modulation disabled Combo Module Laser Diode Driver LDD Section 8610 8C 0 to 1 000 mA 0 0153 0 03 30 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt S5pA 0 to 1 000 mA 1 mA 2 mA Sine amp square wave 200 Hz to 2 kHz 2 kHz to 300 kHz 50 Imax gt Imin lt 1 rms 5 pee 5 lt 2 lt 500 ns 0 5mA pa 0 02 0 004 0 5 HA lt 0 02 0 to 5 Volts user specified 0 to 1 000 0 0 1 0 02 200 pA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 1000 0 Chapter 9 Specifications 107 Optical Powe
8. Io Lim to 80 of the maximum current plus 100 mA and the laser voltage compliance limit Vcomp to 5 0 V and output bandwidth as desired Press the Prev soft key to return to the single display Press the OFF soft key to turn the laser output on if it is not on already Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Press the Vr soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 2 8 Remote Operation Laser Voltage Measurement Calibration a With the output off connect a calibrated voltmeter in parallel a load resistor as selected Table 10 to the laser output terminals Select the channel suchannel via the LAS CHAN command Set the voltage limit to full scale via the LAS LIM LDV command and the current set point necessary to read approximately 80 of full scale voltage For example with a 8560 module with a resistance of 1 Q set the current to 4 800 mA Place the unit into constant current mode via the LAS MODE LDI command Enter the LAS OUTPUT ON command to turn the laser output on Enter the laser voltage calibration mode by issuing the LAS CAL LDV command Input the actual measured laser voltage as an lt
9. Table 3 Laser Link Conditions Table 4 TEC Connector Pintouts Table 5 TEC Link Conditions Table 6 Comparison of Curve Fitting Equations Table 7 Thermistor Constants Table 8 RTD Constants Table 9 Recommended Test Equipment Table 10 Drive Current Load Resistor Selection Table 11 Recommended Test Equipment Table 12 Error Codes Figures Figure I 8000 Front Panel 29 29 38 47 53 57 63 71 72 78 93 Figure 2 Various Data Fields Found on the Master Screen Figure 3 Model 8000 Menu Structure Figure 4 Master Display Expanded Display Figure 5 Master Display Condensed Mode Figure 6 Main Menu Figure 7 Configure System Screen Figure 8 Save Recall Screen Figure 9 Link Screen Figure 10 Configure Communications Screen Figure 11 Rear Panel Figure 12 Power Supply Block Diagram Figure 13 Laser Diode Protection Circuit Figure 14 Common Laser Cathode Photodiode Cathode Figure 15 Common Laser Cathode Photodiode Anode Figure 16 Common Laser Anode Photodiode Cathode Figure 17 Common Laser Anode Photodiode Anode Figure 18 Laser Main Screen Figure 19 Laser Setup Screen Figure 20 Laser Module Block Diagram Figure 21 Constant Current High Bandwidth Mode Figure 22 Constant Current Low Bandwidth Mode Figure 23 Constant Power Mod
10. calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 3 3 Remote Operation Thermistor Calibration a Measure and record the exact resistance of your metal film resistor Use nominal values of 20 KQ for the 100A setting and 200 KQ for the 10pA setting With the TEC output off connect the metal film resistor to the sensor input of the TEC Module Enter the TEC CHAN command to select the channel suchannel to be calibrated Send TEC SENS 1 100pA thermistor or TEC SENS 2 for the 10yA thermistor followed by the TEC CAL SEN to enter sensor calibration mode The 8000 will be ready to receive the resistance when after a TEC CAL SEN query is sent a 1 is returned Input the actual resistance of the metal film resistor in kQ as an lt nrf value gt via the TEC R lt nrf value gt command If at any time prior to TEC R a command other than TEC R or TEC R is sent to the 8000 the 8000 will cancel the calibration mode 80 Chapter 6 Calibration and then process the command s Once the TEC R value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command 6 3 4 Local O
11. current feedback is used to control the laser output In this mode capacitors are switched into the circuit These capacitors act as a filter and therefore prevent the laser output from changing too rapidly This gives added laser diode protection This also limits the laser output bandwidth to about 10 kHz In the Low Bandwidth CW mode the bandwidth is further limited to 30 Hz Unregulated DC Voltage Regulator Modulation Input Port Pass Transistor Output Shorting SZ aser Diode Current Sense Current Set Point i Figure 21 Constant Current High Bandwidth Mode Chapter 3 Laser Diode Driver Module Operation 43 Unregulated DC Voltage Regulator Pass Transistor Modulation Input Current Set Point Output Ha Shorting Laser Diode Current Sense Figure 22 Constant Current Low Bandwidth Mode 3 6 11 Constant Power Mode In constant P mode the laser circuit is configured as shown in Figure 23 Photodiode feedback is used to control the laser output and the bandwidth is held low Unregulated DC Voltage Modulation Input Regulator Pass Transistor P Laser Diode Photodiode Input Amp Current ense Figure 23 Constant Power Mode 3 6 12 Laser Interlock Operation 44 Chapter 3 Laser Diode Driver Module Operation The back panel laser input output connector has interlock connections which must be connected before the laser output will be
12. 1 373419 2 771785 999768 BetaTHERM 1K7 1 446659 2 682454 649916 BetaTHERM 2K3 1 498872 2 379047 066953 BetaTHERM 2 2K3 1 471388 2 376138 051058 BetaTHERM 3K3 1 405027 2 369386 012660 BetaTHERM 5K3 1 287450 2 357394 0 950520 BetaTHERM 10K3 1 129241 2 341077 0 877547 BetaTHERM 10K4 1 028444 2 392435 562216 BetaTHERM 30K5 0 933175 2 213978 263817 BetaTHERM 30K6 1 068981 2 120700 0 901954 BetaTHERM 50K6 0 965715 2 106840 0 858548 BetaTHERM 100K6 0 827111 2 088020 0 805620 BetaTHERM 1M9 0 740239 1 760865 0 686600 Table 7 Thermistor Constants 4 5 2 AD590 and LM335 AD590 and LM335 sensors are not supported on dual or combination TECs Chapter 4 Temperature Controller Module Operation 59 4 5 2 1 4 5 2 2 General The 8000 uses two constants C1 and C2 for calibrating the two linear thermal sensing devices the AD590 and the LM335 C1 is used as the zero offset value and C2 is used as the slope or gain adjustment Therefore C1 has a nominal value of 0 and C2 has a nominal value of 1 when using the AD590 or LM335 In order to calibrate a linear sensor device the sensor must be operated at an accurately known stable temperature For example the sensor may be calibrated at 0 C if the sensor is placed in ice water until its temperature is stable A highly accurate temperature probe thermometer environmental chamber etc may also be to determine the known temperature for calibration AD590 Sensor The AD590 is a linear thermal
13. 5 Amps 20mA lt IlmA 17 ppm 33 ppm lt 0 05 100 00 C to 240 00 C 0 01 kQ to 495 000 kQ 0 001 kQ to 49 500 kQ 20 Q to 192 Q 2331 mV to 3731 mV 248 15 uA to 378 15 uA 5 00 Amps 0 01 C 10 Q 1Q 0 01 Q 0 1 mV 0 01 uA 1 mA 0 1 C 0 04 16 Q 0 05 8 Q 0 03 50 mQ 0 09 1 m V 0 005 0 5 uA 0 09 2 mA of reading fixed error Temperature Controller TEC Dual TEC Module 8325D Dual 2 5 Amps 6 Volts 15 Watts 0 076 q 0 02 set point 4 mA p gt 0 to 2 5 Amps 10mA lt l mA lt 0 05 100 00 C to 240 00 C 0 01 KQ to 495 000 kQ 0 001 KQ to 49 500 kQ N A N A N A 2 50 Amps 0 01 C 10Q 1Q N A N A N A 1 mA 0 1 C gt N A N A N A gt Chapter 9 Specifications 99 Temperature Sensors Temp Control Resolution Temp Control Accuracy Sensor Bias Current or Voltage Temperature Calibration Thermistor AD590 LM335 Pt RTD Thermistor 0 01 C pa 0 05 C 10 pA 100 pA 1 T C1 x 1079 C2 x 10 4 In R C3 x 10 7 In R T C1 C2 x lapsow 1uA K 273 15 T Cl C2 x Viwa3s 10mV K 273 15 C22 t 20 C Rt Ro 1 Clt4 AD590 0 01 C E 0 05 C 5 Volts Rt Ro 1 Clt LM335 0 01 C me 0 05 C 1mA C22 C3t t 100 t lt 0 C Ro resistance at 0 C where Ro 100Q for a 100Q Pt RTD gt Accurac
14. 6 Power Supplies 22 2 6 1 Module Power Supplies 22 2 6 2 Main Supply 23 2 7 Warm Up and Environmental Consideration 23 3 Laser Diode Driver Module Operation 25 3 1 Laser Diode Driver Module 25 3 1 1 Introduction 25 3 1 2 Installation 25 3 1 3 Laser Diode Protection Requirements 26 3 2 Laser Safety Features 28 3 2 1 Conditions Which Can Automatically Shut Off the Laser Output 28 3 2 2 Key switch Interlock 28 3 2 3 Turn On Delay 28 3 3 The Laser Connectors 28 3 3 1 Modulation 29 3 3 2 Photodiode Bias Control 30 3 3 3 Photodiode 30 3 3 4 Interlock 30 3 4 Connecting to Your Laser 30 3 4 1 Laser Diode Connections and Shielding 31 3 4 2 Photodiode Feedback Connections 32 3 4 3 Sync Out Option 33 3 4 4 Grounding Consideration 33 3 5 Laser Module Operation 33 3 5 1 Quick Start 33 3 5 2 Laser Main Screen 34 3 5 3 Laser Setup Screen 35 3 5 4 Laser Modulation Setup Screen 37 3 5 5 Link Conditions 38 3 6 Laser Module Theory of Operation 40 3 6 1 Laser Interface 40 3 6 2 Limit DAC 40 3 6 3 Set Point DAC 41 3 6 4 A D Converter 41 3 6 5 Current Source Voltage 41 3 6 6 Output Shorting 41 3 6 7 Modulation Voltage Control Input Port 41 3 6 8 Photodiode Feedback Amplifier 41 3 6 9 Constant Current High Bandwidth Mode 42 3 6 10 Constant Current Low Bandwidth Mode 42 3 6 11 Constant Power Mode 43 3 6 12 Laser Interlock Operation 43 Temperature Contr
15. Except for MOPA modules pins 4 and 5 of the 9 pin D connector are the negative output and pins 8 and 9 are the positive output current connections These pins are jumpered to provide greater contact area for the output connection NOTE Whenever external connections are made to the output at pins 4 and 5 and 8 and 9 these connector leads should be jumpered to ensure the greatest laser diode safety We also recommend the use of the 9 pin D connector for your interface rather than binding posts or loose wires This will insure the best connection Chapter 3 Laser Diode Driver Module Operation 3 4 1 Laser Diode Connections and Shielding CAUTION Before connecting the laser diode to the module be sure that the LASER ENABLE is in the OFF position Before turning on the laser output be sure that the current limit and voltage compliance limit have been correctly set NOTE The cable connections to the laser must be secure to avoid an open circuit should they be jostled or bumped Should an open circuit occur during laser operations the laser output will normally be turned off automatically Except for MOPA modules special circuits in the laser module are present for detecting intermittent contacts and connections These circuits detect the abrupt change in current that occurs when the output circuit is opened Experience indicates that should an open circuit occur during laser operation the laser may be
16. On Turn On 2 2 1 Off Turn Off2 3 2 T Lim Turn Off1 Link 1 turns on the TEC whenever the laser is on Link 2 turns off the TEC whenever the laser is off Link 3 turns off the laser if the TEC exceeds its temperature limits There is no need to define a fourth link to turn off the TEC on a T Lim condition because if Link 3 turns off the laser Link 2 will automatically turn off the TEC As shown in the example above it is possible to setup a level of control that would normally only be possible with a computer based monitoring system See each module s manual for a list of link conditions 20 Chapter 2 System Operation 2 4 10 2 4 11 When the unit enters remote mode the linking screen is not accessable Calibration Screen See calibration chapter for detailed information Configure Communications Screen onfianre Conmynications Diselay Errors While Femote Ho Uze remote screen Configure GPIB GPIB Address 4 Configure Ro232 Speed F6E0Baud Terminal Mode Ho Figure 10 Configure Communications Screen Display Errors While Remote controls the announcement of errors on the 8000 s screen When this setting is set to Yes then all errors will pop up on the 8000 screen even in remote mode When the setting is No error s are not displayed on the 8000 screen while in remote mode but will be displayed in local mode This does not affect the error list which is queried via the GPIB ERR query It is i
17. Resistance 100 uA TE Current 4 Temperature Sensor Sensor Type Sensor Bias Thermistor Calibration 86xx 2 5 Amps 6 Volts 15 Watts 0 to 2 5 Amps 10mA lt 1lmA lt 17 ppm lt 33 ppm 0 05 100 00 C to 240 00 C 0 01 KQ to 495 KQ 0 001 KQ to 49 5 KQ 2 50 Amps 0 01 C 10Q 1Q 1 mA 0 1 C 0 04 16 Q 0 05 8 Q 0 3 2 mA NTC 2 wire Thermistor 10 pA 100 pA 1 T C1 x 10 3 C2 x 10 4 In R C3 x 10 7 In RP 13 of reading fixed error 14 Temperature is a value derived from using the thermistor calibration equation Accuracy can be computed by applying the sensor s resistance parameter to the above equation at the temperature in question Chapter 9 Specifications 105 9 2 Model 8008 Modules 9 2 1 Specifications Laser Output Output Current Range mA Output Current Resolution mA 16 bit Output Current Accuracy Compliance Voltage Temperature Coefficient Full Scale Short Term Stability 1 hr Full Scale Long Term Stability 24 hr Full Scale Noise Ripple rms Current Limit Range Resolution Accuracy Photodiode Input Range Stability Full Scale 24 hours Accuracy Temperature Coefficient Full Scale C Photodiode Reverse Bias Measurement Display Output Current Range mA Output Current Resolution mA Output Current Accuracy Forward Voltage Range Volts Forward Voltage Reso
18. Static fields are elements on the display which do not change from moment to moment These can include help text screen titles and error messages Non Editable Data Fields Non editable data fields are used mainly to display read back information such as temperature laser current etc These fields can have a prefix or suffix label such as To or mA and are periodically updated by the system Editable Data Fields Editable data fields are used for module and system settings such as current set point temperature set point display contrast etc An editable field has four distinct display states focused focused and editing non focused and read only The focused state indicates that the field has the input focus When the a field has the focus it is shown in reverse color white text on black background if the display is not inverted Any keyboard entry or knob adjustment will be applied to the field and only one field at a time on the display can have focus Move between fields using the up and down arrow keys When the user starts to make changes to the data field using the numeric or left right arrows the field enters the focused and editing state In this state a box is drawn around the data field to indicate changes are being made to the value See section 2 4 1 3 1 below for a description of how the keyboard operates while in this state The box will remain around the field until Enter or Clear is pressed or
19. damaged Therefore secure cabling is important NOTE Although the Intermittent Contact circuitry works well in helping to protect the laser diode there is still a danger in having poor connections as no circuit can protect completely NOTE It is possible with some modes of modulation especially square wave to trigger the intermittent contact circuit and cause a shut down If this is the case for you the intermittent contact feature may be disabled in the laser set up menu with reduced laser protection in the case of poor connections It is recommended that the connections to the module output be made using twisted wire pairs with an earth grounded shield available at pin 3 except MOPA modules that use the ground post on the mainframe The output terminals of the module are 32 Chapter 3 Laser Diode Driver Module Operation 3 4 2 left floating relative to earth ground to suppress AC power on power off transients that may occur through an earth ground path If the output circuit is earth grounded at some point such as through the laser package and mount the user must be careful to avoid multiple earth grounds in the circuit Multiple earth grounds may provide circuit paths that shut out the driver and may damage the laser Photodiode Feedback Connections The photodiode signal is input at the 9 pin D connector at pins 6 and 7 or the photodiode BNC Many laser diode modules contain an internal
20. earth ground In accordance with ongoing efforts to continuously improve our products Newport Corporation reserves the right to modify product specifications without notice and without liability for such changes
21. enabled On the laser input output connector pins 1 and 2 form the interlock path If there is not a connection between these pins the laser output will not be enabled When this path is broken the laser Interlock Error condition event will be reported in the laser Condition Status Register and the Laser Event Status Register This interlock is a safety feature for laser protection It requires that the connecting cable be secure before the laser output is enabled A secure connection significantly reduces the possibility of an intermittent open circuit to the laser drive current 4 1 4 1 1 C HAPTER 4 Temperature Controller Module Operation Temperature Controller TEC Module Introduction The 8300 and 8600 Series Temperature Control Modules are precision thermoelectric cooler control modules for use in the 8000 Modular Controller It may be installed in any of the channel slots on the rear of the 8000 and may be interchanged with any other Features of the 8300 and 8600 Series include Service free modularity calibration information is stored on the module Close case calibration Operational with most thermistors IC and RTD temperature sensors Flexible setup with 8000 Save Recall front panel functions High temperature stability Current Limit Installation This section describes the procedures for installing and removing a Model 8000 compatible module from the 8000 NOTE The save recall bin information will be
22. equation is used to determine the temperature Its reference current is sensed across a resister and this voltage is measured The ITE current is also measured R Mode In constant R mode the TEC is driven to the set point resistance voltage or current This resistance voltage or current is measured and converted to a temperature The ITE current is also measured ITE Mode In constant ITE mode the TEC is driven with a constant current at the ITE set point value The ITE current is sensed across a resistor and the voltage is converted to ITE current 5 1 5 2 5 3 CHAPTER 5 Maintenance Introduction Module specific calibration can be found in the module s manual There is no calibration on the main frame Do not attempt to remove the cover Fuse Replacement The fuses are accessible on the back panel of the 8000 Before replacing a fuse turn power off and disconnect the line cord Use only the fuses indicated below Line Voltage Fuse Replacement 90 110 VAC 5 00 Amp 3 AG Slo Blo 250V 108 132 VAC 5 00 Amp 3 AG Slo Blo 250V 198 242 VAC 2 50 Amp 3 AG Slo Blo 250V 216 250 VAC 2 50 Amp 3 AG Slo Blo 250V Cleaning Use mild soap solution on a damp but not wet cloth Disconnect AC power before cleaning 69 6 1 6 2 6 2 1 C HAPTER 6 Calibration Calibration Overview The 8000 performs an automatic DAC calibration on power up This removes the majority of calibration error However if it
23. is desired to completely calibrate the system the following procedures will do so All calibrations are done with the case closed The instrument is calibrated by changing the internally stored digital calibration constants All calibrations may be performed locally or remotely Environmental Conditions Calibrate this instrument under laboratory conditions We recommend calibration at 25 C 1 0 C When necessary however the 8000 may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 C to 40 C Warm Up The 8000 should be allowed to warm up for at least 1 hour before calibration Laser Calibration This chapter describes how to calibrate the 8500 8600 Series laser modules Recommended Equipment Recommended test equipment for calibrating the module is listed in Table 1 Equipment other than that shown in the table may be used if the specifications meet or exceed those listed Description Mfg Model Specification DMM HP 34401A DC Amps 1 0 A 1 Resistance 10 ohms 0 02 Resistor High Power 1 Q 50 W 2 Q 25 W 5 Q 10 W Low Temperature 10 Q 5 W 30 Q 2 W Coefficient Optical NEC PS2501 1 or equivalent 6 pin Isolator Connector D sub 9 pin male Table 9 Recommended Test Equipment 71 72 Chapter 6 Calibration 6 2 2 Drive Current Load Resistor Selection Laser Drive Current Resistor 200 mA 30 Q 2 W 500 mA 10 Q 5 W 1 000 mA 5 Q
24. limits set the sensor type to None Use caution when limits are not active as the temperature may exceed your TEC or Laser s thermal limits Const ITE mode is not supported on dual or combination TECs Effects of Calibration on TEC modes On startup the 8300 8600 performs an auto calibration to eliminate most of the error in ADC and DAC values After this auto calibration each sensor type supported by the module has an offset calibration while the ITE set point and read back has a two point calibration These calibration constants are then used to calibration a set point or read back value This includes cross mode values such as displaying actual current while in constant temperature mode While the current set point calibration has no effect in Const T mode the read back calibration is used to more accurately display the actual current Limits TE Current Limit Limit ITE This sets the maximum drive current the module will allow This maximum applies to all modes constant ITE R T Temperature Limits Limit THI and Limit TLO The 8300 8600 supports both a low and high temperature limit and can be programmed to turn the TEC output off in the event those limits are exceeded default state The temperature limits are monitored regardless of the mode of the module This has the added safety feature of shutting down the module in Const ITE 52 Chapter 4 Temperature Controller Module Operation 4 4 3 5 3 4 4
25. may appear at the output When the laser output is turned on the shunt circuit and short are removed gradually and in two stages This ensures transient protection of the laser output Modulation Voltage Control Input Port The rear panel MOD input connector drives a precision wide band instrumentation amplifier allowing the differential control signal applied to this port to use a different ground than the laser output terminals However due to the input common mode voltage restrictions the MOD input should be within 10 volts of the laser output terminals Each 100 mV change in the modulation input is equal to 1 of the maximum drive current of the module For example 100 mV input on a 6560 module 6 A driver would equate to 60 mA of drive current However regardless of the input voltage the current cannot exceed the current limit Photodiode Feedback Amplifier Photodiode feedback is amplified by a precision instrumentation amplifier When constant Power mode is selected the photodiode feedback signal is used to control the laser output 42 Chapter 3 Laser Diode Driver Module Operation 3 6 9 Constant Current High Bandwidth Mode This mode of laser operation is shown in Figure 21 In this mode current feedback is used to control the laser output The bandwidth is between 50 kHz and 500 kHz depending on the model 3 6 10 Constant Current Low Bandwidth Mode This mode of laser operation is shown in Figure 22 In this mode
26. nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then drive the current to the negative current value of the initial set point The 8000 will be ready to receive the third measured current value when after a TEC CAL ITE query is sent a 1 is returned e Input the third actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then drive the current to 25 of the negative current value of the initial set point The 8000 will be ready to receive the fourth measured current value when after a TEC CAL ITE query is sent a 1 is returned f Input the fourth actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command If at any time prior to the last TEC ITE a command other than TEC ITE or TEC ITE is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s Once the TEC ITE value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command Remote Operation Ite Current Readback Calibration Dual and Combo TEC Modules Because the dual and combo modules only support constant temperature mode calibration of the ITE readback is done using the limit circuit By
27. off Out Tol Laser is out of tolerance In Tol Laser is in tolerance Io Lim Laser is current limiting Vr Lim Laser has reached its voltage limit Im Lim Laser has exceeded photodiode current limit Po Lim Laser has exceeded photodiode power limit Interlock Laser interlock is not closed Open Laser module is open circuit Short Laser module is shorted Table 3 Laser Link Conditions Chapter 3 Laser Diode Driver Module Operation 39 See the section 2 4 9 for a complete description of the linking process 40 Chapter 3 Laser Diode Driver Module Operation 3 6 Laser Module Theory of Operation Figure 20 shows the functionality of the Laser Module The following sections detail the theory of operation for each of the blocks in Figure 20 The circuit block diagrams for each laser mode of operation are shown in Figure 21 Figure 22 and Figure 23 The theory of operation for each mode of operation is discussed in Sections 3 6 9 3 6 11 Unregulated DC Voltage Optically Microprocessor Isolated Serial Bus Laser Output On Off Diode ese Output aS Slow Turn On Modulation Curen Input Port Current Feedback P Photodiode Figure 20 Laser Module Block Diagram 3 6 1 Laser Interface The laser interface provides optically isolated serial communications between the laser board and the microprocessor Control signals are passed to the laser board to set the laser board status current limit current set points and phot
28. photodiode that monitors the back facet emission of the laser Usually one side of the photodiode is internally connected to either the laser anode or cathode Figure 14 through Figure 17 show the recommended connections and shielding for the various configurations of laser diode modules and photodiode feedback schemes The photodiode circuit is isolated from ground and the laser circuit Therefore when using a 4 pin package with no common connections place a IMQ resistor between the laser diode cathode and the photodiode anode to provide a bias return for the photodiode circuit Output 8500 module Earth Ground Figure 14 Common Laser Cathode Photodiode Cathode Output 8500 module Earth Ground Figure 15 Common Laser Cathode Photodiode Anode Chapter 3 Laser Diode Driver Module Operation 33 3 4 3 3 4 4 3 5 3 5 1 Output 8500 module Earth Ground Figure 16 Common Laser Anode Photodiode Cathode Output 8500 module Earth Ground Figure 17 Common Laser Anode Photodiode Anode Sync Out Option The Sync Out connector on the back of the 8600 series is a custom option normally the connector will not be loaded Grounding Consideration The laser outputs of the module are isolated from chassis ground allowing either output terminal to be grounded at the user s option Laser Module Operation Quick Start After the power on sequence is complete the 8000 goes to the Master d
29. press the up or down arrow to move to the next field or change to another screen without first pressing Enter to store the new value If focus is removed from the field before the Enter key is pressed it reverts to its previous value discarding the user s input The Clear button is used to revert a value being changed back to the previous value before Enter is pressed When changing values with the knob if the focused field is not currently being edited changes made with the knob take effect immediately There is no need to press Enter after making changes with the knob Ifa field is being edited then the knob acts as a simple up down adjustment to the edited value and these changes do not take affect until the Enter key is pressed There are a few other keys the operator can use during input The button is used to change the sign of a numerical input such as 45 0 to 45 0 but does not otherwise affect the value If the field is a numeric field the left arrow functions as a backspace key allowing correction of a mis typed digits If the field is a multi choice field such as a Yes No field the left and right arrows function as previous and next choice respectively Soft Key Labels Soft key labels are labels for the buttons located to the immediate right of the display Each label either indicates the action that is performed when the corresponding key is pressed such as changing screens or the state of a data element in the sy
30. sensor which acts as a current source It produces a current i which is directly proportional to absolute temperature over its useful range 50 C to 150 C This nominal value can be expressed as i luA K where i is the nominal current produced by the AD590 and K is in Kelvin The 8000 uses i to determine the nominal temperature Ta by the formula Ta i 1 uA K 273 15 where T is in C The displayed temperature Ty C1 C2 T is then computed where C1 and C2 are the constants stored in the 8000 for the AD590 The AD590 grades of tolerance vary but typically without adjusting C1 and C2 the temperature accuracy is 1 C over its rated operating range However the AD590 is not perfectly linear and even with C1 accurately known there is a non linear absolute temperature error associated with the device This non linearity is shown in Figure 28 reprinted from Analog Devices specifications where the error associated with C1 is assumed to be zero 60 Chapter 4 Temperature Controller Module Operation 1 6 0 8 ABSOLUTE ERROR 0 8 1 6 55 150 DEGREES C Figure 28 AD590 Nonlinearity If a maximum absolute error of 0 8 C is tolerable the one point calibration of C1 should be used Ifa greater accuracy is desired the two point method of determining C1 and C2 should be used Note however the absolute error curve is non linear therefore the constant C2 will vary for different measurement points 4 5 2 3 LM33
31. system configure screen which can be reached by pressing the MENU button followed by the Config soft key then the System soft key The field is labeled On Delay The Laser Connectors On all laser modules except the MOPA a 9 pin female D connector is used for input and output connections as shown by the pin out diagram below Pin Description This condition will always shutdown the laser output and cannot be disabled 3 3 1 Chapter 3 Laser Diode Driver Module Operation 29 1 2 Interlock 3 Chassis Ground 4 5 Laser Cathode 6 Photodiode Cathode 7 Photodiode Anode 8 9 Laser Anode Table 1 Laser Connector Pinouts For MOPA modules a 15 pin male D connector is used for the MOPA cable and a 9 pin male connector is used for the TEC jumper cable as shown below MOPA Connector TEC Strap Connector Pin _Description Pin Description TE 1 2 TE Analog Ground 5 Ground 1 2 3 OSC LAS 4 OSC 5 12V Fan 6 LAS 7 N C 8 TEt 9 Interlock 10 Therm 11 Therm 12 MPD 13 MDP 14 LED 15 LED Modulation 6 77 TE 8 Therm 9 Therm Table 2 MOPA Laser Connector Pinouts Do not connect or disconnect a signal to the modulation CAUTION input with the laser on A BNC connector is provided for an external modulation signal See section 3 5 3 2 for a description of modulation bandwidth Each 100 mV chang e in the modulation input is equal to 1 of the maximum driv
32. the actual current measured in pA by the external ammeter as an lt nrf value gt via the TEC R lt nrf value gt command Chapter 6 Calibration 81 If at any time prior to TEC R a command other than TEC R or TEC R is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s Once the TEC R value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command 6 3 6 Local Operation LM335 Sensor Calibration a With the TEC output off connect a 3 kQ metal film resistor and a precision voltmeter in parallel at the sensor input of the TEC module Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Press the Setup soft key and select the LM335 as the Sensor Type Press the Prev soft key to return to the single display Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC sensor calibration mode by pressing the Sensor soft key Follow the on screen instructions to complete the calibration The calib
33. the user moves focus to another field using the up or down arrows The non focused state indicates that the field is editable but does not currently have the focus These fields are drawn with a solid underline Using the up and down arrows focus can be moved to these fields Chapter 2 System Operation 11 2 4 1 3 1 2 4 1 4 When the editable data field is in the read only state it looks and acts exactly like a non editable data field Like the non editable data field it cannot have focus and the up or down arrow keys will skip over the field This state is used primarily to lockout specific data elements from front panel change when the Model 8000 is in remote mode Any IEEE 488 or RS 232 communication will place the unit in remote mode and editable fields that are protected during remote operations change to the read only state Changing Data Fields A data field can only be changed from the front panel when the field has the focus Some fields are numeric based such as current set point or temperature limits Other fields are multi choice fields such as Yes No fields Both types are changed with the left and right arrows or the knob Below is a description of each of the keys used for front panel input Perhaps the most important key is the Enter key Any changes to a data field made with the numeric pad or left right arrows are not put into effect until the enter key is pressed It is a common mistake to type in a number and
34. we have found that the constants A B and C for virtually all common thermistors lie within a narrow range Consequently we have defined the constants Cl C2 C3 as follows C1 A 10 Resistance of a 10K Fenwal UUA41J1 thermistor Constants A 0 963 10 B 2 598 107 Constants A 1 125 10 C1 1 125 B 2 347 107 C2 2 347 C 0 855 107 C3 0 855 58 Chapter 4 Temperature Controller Module Operation C2 B 10 C3 C 10 The constants C1 C2 and C3 may all be expressed in the form n nnn simplifying entry into the 8000 If high accuracy is not required the Steinhart Hart equation may be simplified to a first order polynomial 1 T A B LnR This equation is easier to solve and often provides adequate results The table also shows that the use of the simplified equation introduces temperature errors of less than 0 5 C over the range 20 C to 50 C Once the constants A and B are determined the 8000 is programmed with the following values of C1 C2 and C3 Cl A 10 C2 B 10 C3 0 000 4 5 1 7 Table of Constants We have listed some common thermistors and included the appropriate calibration constants for the temperature range 20 C to 50 C in Table 7 The Model 8000 by default uses the Beta THERM 10K3A2 thermistor values Manufacturer Cl C2 C3 BetaTHERM 10K3 1 129241 2 341077 0 877547 BetaTHERM 0 1K1 1 942952 2 989769 3 504383 BetaTHERM 0 3K1 1 627660 2 933316 2 870016 BetaTHERM 1K2
35. 10 W 3 000 mA 2 Q 25 W 6 000 mA 1 Q9 50 W Table 10 Drive Current Load Resistor Selection 6 2 3 Local Operation Current Source Io Calibration a With the output off connect a load resistor as selected Table 10 and a calibrated ammeter in series across the laser output terminals If an ammeter with the appropriate current ratings is unavailable connect a calibrated DMM across the laser output terminals to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance Go to the single module display by first pressing the MENU button then the Modules soft key then the soft key s that correspond to the module to be calibrated Press the Setup soft key and set the laser current limit Io Lim to one half scale plus 100 mA and output bandwidth as desired Press the Prev soft key to return to the single display Press the OFF soft key to turn the laser output on if it is not on already Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Press the the Io soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completin
36. 100 00 0 01 reading fixed error 8 True rms 3Hz to 300 kHz FS resistive load 9 8505D 0 to 500 mA 0 0076 0 03 15 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 uA 0 to 500 mA 1 mA 2 mA 0 5mA a 0 02 0 004 0 5 LA lt 0 02 none 0 to 500 0 0 01 0 02 20 pA 0 000 to 5 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 500 0 0 01 Dual Laser Diode Driver LDD Modules 8510D 0 to 1 000 mA 0 0153 0 03 30 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 5 pA 0 to 1 000 mA 1 mA 2 mA 0 5mA oS 0 02 0 004 0 5 pA lt 0 02 none 0 to 1 000 0 0 1 0 02 200 pA 0 000 to 5 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 1000 0 0 01 102 Chapter 9 Specifications 9 1 5 Specifications Laser Output Output Current Range mA Output Current Resolution mA 16 bit Output Current Accuracy Compliance Voltage Temperature Coefficient Full Scale Short Term Stability 1 hr Full Scale Long Term Stability 24 hr Full Scale Noise Ripple rms Current Limit Range Resolution Accuracy Internal Function Generator Waveforms Frequency Range 1 Frequency Range 2 Squarewave Duty Cycle 5 Independent Output Set Points Frequency Jitter Frequency Accuracy Amplitude Accuracy Sinewave Total Harmonic Distortion Squarewave risetime
37. 3 6 4 4 3 7 4 4 4 or Const R mode when the temperature limit is exceeded if the output off bits are enabled for this condition Caution these limits do not apply if the sensor type is set to None Resistance Reference Limits Limit RHI vHI iH and Limit RLO VLO iLO Like the temperature limits the 8300 8600 also supports both a low and high resistance reference limit and can be programmed to turn the TEC output off in the event those limits are exceeded although by default this is disabled These limits are monitored only while in Const R v i mode Tolerances Tol Time and Tol Temp The Tol Time and Tol Temp elements are used for determining when the 8300 is in tolerance where the actual temperature has stayed within Tol Temp of the set point for at least Tol Time seconds The Tol Time value is expressed in seconds and can range from 0 001 seconds to 50 seconds The Tol Temp value is displayed in C the most common usage and can range from 0 01 to 10 00 If at any time it goes outside the tolerance range the time restarts at zero As an example if the Tol Time is set to 5 seconds the Tol Temp is set to 0 2 C and the temperature set point was 25 0 C the TEC module would have to stay within 24 8 C and 25 2 C to be within tolerance Out of tolerance is indicated by a Out Of Tol status field on the bottom of the TEC Main Screen The out of tolerance condition is most often used to shutdown laser outputs wh
38. 4 0 5 pA 0 to 5 Volts 0 to 500 00 0 01 0 02 20 uA 0 000 to 7 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 500 00 0 01 reading fixed error Laser Diode Driver LDD Modules 8510 0 to 1 000 mA 0 0153 0 03 30 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 10 pA lt 8 0 pA lt 2 5 pA 0 to 1 000 mA 1 mA 2 mA 0 to 10V 10kQ 100 mA V DC to 250 kHz DC to 10 kHz DC to 30 Hz lt 0 02 0 5mA 0 02 0 004 0 5 HA 0 to 5 Volts 0 to 1 000 0 0 1 0 02 200 pA 0 000 to 5 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 1000 0 0 01 8530 0 to 3 000 mA 0 0458 0 03 90 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 15 pA lt 10 pA lt 6pA 0 to 3 000 mA 1 mA 4mA 0 to 10V 10kQ 300 mA V DC to 100 kHz DC to 10 kHz DC to 30 Hz lt 0 02 0 20 mA kra 0 02 0 004 1 uA 0 to 5 Volts 0 to 3 000 0 0 1 0 02 200 pA 0 000 to 5 000 0 1 0 005 0 3 mV 15 20 000 0 1 0 01 1 pA 0 00 to 600 00 0 01 0 00 to 3000 0 0 01 Other current ranges are available upon request please consult with factory F 8560 0 to 6 000 mA 0 0916 0 03 180 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 25 uA lt 20 nA lt 17pA 0 to 6 000 mA 1mA 6mA 0 to 10V 10kQ 600 mA V DC to 100 kHz DC to 10 kHz DC to 30 Hz
39. 418 E 431 E 432 E 433 E 501 E 502 E 503 Explanation lt PROGRAM DATA gt will not convert to a character value lt PROGRAM DATA gt will not convert to a byte array pointer lt PROGRAM DATA gt is incorrect block data length lt PROGRAM DATA length exceeds maximum Present configuration has changed from last stored configuration Attempted to recall a bin from a unsaved position A lt RESPONSE MESSAGE gt was ready but controller failed to read it Query error 6000 is talker but controller didn t read entire message Input buffer overflow Output buffer overflow Parser buffer overflow Sensor open disabled output TEC module open disabled output TEC Current limit disabled output TEC Voltage limit disabled output TEC resistance reference limit disabled output TEC high temperature limit disabled output Sensor change disabled output TEC out of tolerance disabled output TEC control error disabled output Analog section status is all 1 s or all 0 s power down Serial EPROM checksum error Sensor short disabled output Incorrect Configuration for Calibration Sequence to start TEC output must be on to begin calibration TEC Cl C2 or C3 constants are bad all set to default values TEC link condition forced output on TEC link condition forced output off Attempt to select non TEC channel for TEC mode Laser interlock disabled output Laser hard current limit disabled output Laser ope
40. 5 Sensor The LM335 is a linear thermal sensor which acts as a voltage source It produces a voltage v which is directly proportional to absolute temperature over its useful range 40 C to 100 C This nominal value can be expressed as v 10mV K where v is the voltage produced by the LM335 and K is Kelvin The 8000 uses v to determine the nominal temperature Ta by the formula Ti v 10mV K 273 15 where T is in C The temperature Ty which is displayed by the 8000 is calculated as follows Tyg Cl1 C2 T where C1 and C2 are the constants stored in the 8000 for the LM335 When the LM335 is calibrated to 25 C C1 0 and C2 1 and the temperature accuracy is typically 0 5 C over the rated operating range However the LM335 is not perfectly linear and even with C1 accurately known there is a non linear absolute Chapter 4 Temperature Controller Module Operation 61 4 5 2 4 4 5 2 4 1 temperature error associated with the device This non linearity caused error is typically 0 3 C with the error associated with C1 assumed to be zero If a maximum absolute error of 0 3 C can be tolerated the one point calibration of C1 should be used Ifa greater accuracy is desired the two point method of determining C1 and C2 should be used Note however the absolute error associated with the constant C2 may vary over different temperature ranges Determining C1 and C2 for the AD590 and LM335 The nominal values of C1 an
41. 5 uA 0 to 1 000 mA 1 mA 2 mA Sine and square wave user specified 0 to 1 000 0 0 1 0 02 200 pA 0 000 to 7 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 Combo Module Laser Diode Driver LDD Section 8630 0 to 3 000 mA 0 0458 0 03 90 pA 5 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 6pA 0 to 3 000 mA 1 mA 4mA Sine and square wave user specified 0 to 3 000 00 0 1 0 02 200 pA 0 000 to 5 000 0 1 0 005 0 3 mV 15 20 000 0 1 0 01 1 pA 0 00 to 600 00 0 01 10 Other current ranges are available upon request please consult with factory True rms 3 Hz to 300 kHz 1 4 FS resistive load modulation disabled 12 reading fixed error Chapter 9 Specifications 103 Optical Power Range mW 0 00 to 500 0 0 00 to 1000 0 0 00 to 3 000 00 Optical Power Resolution mW 0 01 0 01 0 01 104 Chapter 9 Specifications 9 1 5 1 Combo Module TEC Section Specifications TEC Output Maximum Current Maximum Voltage Typical Power Current Limit Range Accuracy Ripple Noise rms Short Term Stability 1 hour 30 C Long Term Stability 24 hour 30 C Temperature Coefficient C C Measurement Display Range Temperature Resistance 10 uA Resistance 100 uA TE Current Resolution Temperature Resistance 10 uA Resistance 100 uA TE Current Accuracy Temperature Resistance 10 pA
42. 9 Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 GPIB RS232 Errors E 400 to E 499 TEC Control Errors E 500 to E 599 Laser Control Errors Table 12 contains all of the error messages which may be generated by the 8000 Not all of these messages may be displayed Some refer to GPIB activities only for example Error Code E 001 E 002 E 101 E 102 E 103 E 104 E 105 E 106 E 107 E 108 Table 12 Error Codes Explanation Memory allocation failure Floating point error lt program mnemonic gt is too long lt PROGRAM MESSAGE UNIT gt is too long lt DEFINITE LENGTH ARBITRARY BLOCK PROGRAM DATA gt length too long lt NON DECIMAL NUMERIC PROGRAM DATA type not defined lt DECIMAL PROGRAM DATA exponent not valid lt DECIMAL PROGRAM DATA gt digit expected lt DECIMAL PROGRAM DATA gt digit not expected lt DECIMAL PROGRAM DATA more than one decimal point 94 Chapter 8 Error Messages Error Code Explanation E 109 lt DECIMAL PROGRAM DATA gt more than exponential indicator E E 110 lt SUFFIX PROGRAM DATA gt must have digit following sign E 111 lt SUFFIX PROGRAM DATA gt must have character following operator E 113 lt ARBITRARY BLOCK PROGRAM DATA less than digit count E 114 lt DEFINITE LENGTH BLOCK PROGRAM DATA gt premature end of data E 115 lt PLACEHOLDER PROGRAM DATA gt identifier not valid E 116 Parser syntax error character was not expected E 120 l
43. Display Expanded Display Figure 5 shows the master display in Condensed mode Instead of displaying a combo or dual module as two separate elements on the master display they are combined into a single element Notice that each combo and dual element has two ON OFF soft keys one active and the other disabled In this mode the MASTER button toggles the active ON OFF button for the combo dual modules Chapter 2 System Operation 15 Im 282 5u40 U 2 650 We 0TE FARR _ I T Sens err Tstt FARR W 5 688 Io 0 a T error Tset 0 a T error Tset B 46 T 25 68 Tset Figure 5 Master Display Condensed Mode The Master Display can be accessed from any screen in the system by pressing MASTER For slots not containing a module the text Not installed is displayed next to the slot number 2 4 5 Main Menu The Main Menu is shown in Figure 6 This is the second highest menu and is used to access four general system functions 1 Modules Pressing the adjacent soft key gives access to each of the four slot positions for setup and control of each module 2 Config Pressing the adjacent soft key gives access to the general configuration menu with soft keys to access system configure save recall and linking screens 3 Comm Pressing the adjacent soft key gives access to the GPIB and RS232 parameters 4 Local When the unit is in remote mode either through GPIB or RS 232C c
44. IEC 1000 4 3 severity level 2 Fast Burst Transients per IEC 1000 4 4 severity level 3 Surge Immunity per IEC 1000 4 5 severity level 3 IEC SAFETY Safety requirements for electrical equipment specified in IEC 1010 1 ne aa neee 7 en Ae Alain Danielo Jeff Cannon VP European Operations General Manager Precision Systems Zone Industrielle 1791 Deere Avenue 45340 Beaune la Rolande France Irvine Ca USA TABLE OF CONTENTS 1 General Information 1 1 1 Introduction 1 1 2 Product Overview 1 1 3 Available Options and Accessories 4 1 4 Safety Terms and Symbols 5 1 4 1 Terms 5 1 4 2 Symbols 6 1 5 General Warnings and Cautions 6 2 System Operation 7 2 1 Introduction 7 2 2 Installation 7 2 2 1 AC Power Considerations 7 2 2 2 Tilt Foot Adjustment 8 2 2 3 Rack Mounting 8 2 2 4 Ventilation Requirements 8 2 25 Power Up Sequence 8 2 3 Introduction to the 8000 Front Panel 9 2 3 1 Front Panel Familiarization 9 2 4 General Operation 10 2 4 1 Display Elements 10 2 4 2 Function Keys 12 2 4 3 Menu Structure 13 2 4 4 Master Display 14 2 4 5 Main Menu 15 2 4 6 Configure Menu 16 2 4 7 System Configure Screen 16 2 4 8 Save Recall Screen 17 2 4 9 Linking Screen 19 2 4 10 Calibration Screen 20 2 4 11 Configure Communications Screen 20 2 5 Rear Panel Familiarization 21 23521 GPIB Connector 21 2 5 2 RS 232 Connector 21 2 5 3 Input Power Connector 22 2 5 4 GND Post 22 2
45. LDD amp 2A 4V TEC Combination Module 8610 8C 1 000 mA LDD amp 2A 4V TEC Combination Module Blank plates provided with Mainframe Controller to cover unused bays Chapter 1 General Information 5 1 4 1 4 1 Accessories 300 02 Temperature Controller Cable 300 04 Temperature Controller Mount Cable 300 16 10 0 kQ thermistor 0 2 C 300 22 AD592CN IC Sensor 300 30 LM335AZ IC Sensor 500 02 Laser Diode Driver Cable 500 04 Laser Diode Driver Mount Cable 8000 RACK Rack Mount Kit 8008 RACK Rack Mount Kit Newport Corporation also supplies temperature controlled mounts lenses and other accessories Please consult with your representative for additional information Safety Terms and Symbols Terms The following safety terms are used in this manual The WARNING heading in this manual explains dangers that could result in personal injury or death The CAUTION heading in this manual explains hazards that could damage the instrument In addition a NOTES heading gives information to the user that may be beneficial in the use of this instrument 6 Chapter 1 General Information 1 4 2 Symbols The following symbols are used in this manual and on the instrument AN Refer to the documentation Earth Ground 1 5 General Warnings and Cautions The following general warning and cautions are applicable to this instrument WARNING This instrument is intended for use by qualified personnel who recognize shock hazard
46. Model 8000 8008 Modular Controller User s Manual Newport Corporation Irvine California has been certified compliant with ISO 9002 by the Ne ort Certificate No FM 27207 British Standards Institution Corporate Headquarters Canada Italy Netherlands Taiwon R O C Newport Corporation Telephone 905 567 0390 Telephone 02 924 5518 Telephone 030 6592111 Telephone 2 2769 9796 1791 Deere Avenue Facsimile 905 567 0392 Facsimile 02 923 2448 Facsimile 030 6570242 Facsimile 2 2769 9638 Irvine CA 92714 France Japan Switzerland United Kingdom Telephone 949 863 3144 Telephone 1 60 916868 Telephone 03 5379 0261 Telephone 01 740 2283 Telephone 01635 521757 Facsimile 949 253 1800 Facsimile 1 60 91 68 69 Facsimile 03 5379 0155 Facsimile 01 740 2503 Facsimile 01635 521348 Belgium Germany Telephone 016 402927 Telephone 06151 36 21 0 Facsimile 016 402227 Facsimile 06151 36 21 52 Limited Warranty Newport warrants that this product will be free from defects in materials and workmanship for a period of two years from the date of shipment If any such product proves defective during the applicable warranty period Newport at its option either will repair the defective product with charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty the customer must notify Newport of the defect before the expiration of the warranty period and make suit
47. URPOSE WHETHER ARISING FROM STATUTE COMMON LAW CUSTOM OR OTHERWISE THE REMEDY SET FORTH IN THIS DISCLAIMER AND LIMITED WARRANTY SHALL BE THE EXCLUSIVE REMEDIES AVAILABLE TO ANY PERSON NEWPORT SHALL NOT BE LIABLE FOR ANY SPECIAL DIRECT INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF THIS PRODUCT OR CAUSED BY THE DEFECT FAILURE OR MALFUNCTION OF THIS PRODUCT NOR ANY OTHER LOSSES OR INJURIES WHETHER A CLAIM FOR SUCH DAMAGES LOSSES OR INJURIES IS BASED UPON WARRANTY CONTRACT NEGLIGENCE OR OTHERWISE BY ACCEPTING DELIVERY OF THIS PRODUCT THE PURCHASER EXPRESSLY WAIVES ALL OTHER SUCH POSSIBLE WARRANTIES LIABILITIES AND REMEDIES NEWPORT AND PURCHASER EXPRESSLY AGREE THAT THE SALE HEREUNDER IS FOR COMMERCIAL OR INDUSTRIAL USE ONLY AND NOT FOR CONSUMER USES AS DEFINED BY THE MAGNUSOM MOSS WARRANTY ACT OR SIMILAR STATE CONSUMER WARRANTY STATUTE 1995 1996 Newport Corporation Irvine California USA Part No 21281 01 Rev H EC DECLARATION OF CONFORMITY Model 8000 8008 Modular Controllers We declare that the accompanying product identified with the ne mark meets all relevant requirements of Directive 89 336 EEC and Low Voltage Directive 73 23 EEC Compliance was demonstrated to the following specifications EN50081 1 EMISSIONS Radiated and conducted emissions per EN55011 Group 1 Class A EN50082 1 IMMUNITY Electrostatic Discharge per IEC 1000 4 2 severity level 3 Rated Emission Immunity per
48. able arrangements for the performance of service In all cases the customer will be responsible for packaging and shipping the defective product back to the service center specified by Newport with shipping charges prepaid Newport shall pay for the return of the product to the customer if the shipment is within the continental United States otherwise the customer shall be responsible for all shipping charges insurance duties and taxes if the product is returned to any other location This warranty shall not apply to any defect failure or damage caused by improper use or failure to observe proper operating procedures per the product specification or operators manual or improper or inadequate maintenance and care Newport shall not be obligated to furnish service under this warranty 1 to repair damage resulting from attempts by personnel other than Newport s representatives to repair or service the product 2 to repair damage resulting from improper use or connection to incompatible equipment 3 to repair damage resulting from operation outside of the operating or environmental specifications of the product NEWPORT S LIABILITY FOR THE MERCHANTABILITY AND USE OF THE PRODUCT IS EXPRESSLY LIMITED TO ITS WARRANTY SET OUT ABOVE THIS DISCLAIMER AND LIMITED WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL REPRESENTATIONS AND WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR PARTICULAR P
49. any screen in the system see section 2 4 2 6 Cursor Control Keys Moves cursor up or down between editable data fields The left arrow functions as a backspace in numerical entry fields or as a previous choice in a multi choice entry field The right arrow functions as a next choice in multi choice entry fields See section 2 4 1 3 for a description of data fields 7 Numerical Keys Used to set parameter values of numerical entry fields in various screens 8 MENU Key Switches to the main menu from any screen in the system see section 2 4 2 9 FUNCTION Key Used to execute user macros and special functions see section 2 4 2 10 CLEAR Key Clears numeric data typed but not yet entered in an edit field 11 ENTER Key Used to enter parameter values set with the numerical or left right arrow keys 10 Chapter 2 System Operation 2 4 2 4 1 2 4 1 1 2 4 1 2 2 4 1 3 12 Knob Used to continuously vary certain parameters The knob has an acceleration factor that causes the rate of change to increase as the knob is turned faster Turning slowly allows for a fine adjustment at the smallest displayed decimal place General Operation Display Elements The Model 8000 uses a graphical display to depict information about the current state of the system The display can be broken down into four basic elements static fields non editable data fields editable data fields and soft key labels Static Fields
50. ation Circuit With the laser output off connect a calibrated ammeter to the PD Anode output of the module and connect the circuit of Figure 30 to the laser and PD outputs If a calibrated ammeter with 0 1 uA resolution is not available place a calibrated DMM with 0 1 mV resolution to measure the voltage across the resistor R3 as shown in Figure 30 Calculate the current in the following steps by using Ohm s Law I V R Chapter 6 Calibration 75 where V is the measured voltage across the resistor and R is the measured load resistance Go to the single module display by first pressing the MENU button then the Modules soft key then the soft key s that corresponds to the module to be calibrated Press the Setup soft key change the Mode to Im Photodiode constant current mode and set the laser current limit Io Lim to maximum Press the Prev soft key to return to the single display Press the OFF soft key to turn the laser output on If a laser on delay has been set wait that amount of time to allow the laser output to engage Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Press the Im soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to co
51. bit A D converter measures the sensor voltage and the current of the bipolar output stage The sensor measurement is used by the microprocessor in the calculation of temperature or thermistor resistance The current measurement is used for the ITE value Sensor Select Sensor selection is accomplished in the Sensor Select block of the TEC board Precision 100uA and 104A current sources may be selected for thermistor control RTD LM335 and AD590 IC temperature sensors may also be selected The AD590 has a 5 VDC bias voltage the LM335 has a 1 mA bias current and the RTD has a precision 1 mA current source The output of the Sensor Select block of the TEC board is a voltage which is proportional to the actual temperature This voltage is fed to the A D converter which provides a digital measurement to the microprocessor and to the PI control loop to close the feedback loop when temperature is being controlled Difference Amplifier Differential amp provides a proportional difference signal to the PI control This signal is the difference between set temperature and actual temperature voltage Proportional Amplifier and Integrator The proportional amplifier is part of a digitally controlled gain stage consisting of the analog switches and their associated resistors The analog switches vary the ratio of resistance in the feedback circuit to change the gain The signal from the difference amplifier is sent to an integrator which reduces the
52. ce between the sensor and the thermo electric cooler by slowing the speed of the integrator Both the proportional gain and the integration time must be matched to the thermal characteristics of the TE cooler and sensor If the settings are incorrect the temperature set point will take an excessive amount of time to settle or it will oscillate around the set point and never settle The Gain setting depends on the type of TE cooler that you are using but we can suggest guidelines for selecting the proper gain Set the gain to 1 fast and increase it until the actual temperature oscillates around the set temperature Then reduce the gain to the next lower value To read the Gain setting go to the setup The display will show the value of the Gain setting In Constant Irg mode the Gain setting has no effect C1 C2 C3 and Ro See the section of each of the sensors for a description of how C1 C2 C3 and Ro are used Mode Constant Temperature Mode Const T This mode holds the TEC at a constant temperature based on feedback from the sensor in the TEC mount using TSET and T variables In this mode the 8000 uses a control loop comparing the sensor input to the temperature set point driving the ITE current positive or negative to reach and maintain that set point The sensor s input is converted to temperature for display of actual TEC temperature The ITE current is also displayed in this mode Chapter 4 Temperature C
53. ce increase and therefore more A D counts at a lower temperature than at a higher temperature because of the non linear resistance of the thermistor Resolution figures for a typical 10 k Ohm thermistor are given below Temperature Voltage at 10 uA Resolution 20 C 56 0 mV C 0 018 C mV 25 C 4 4 mV C 0 230 C mV 50 C 1 4 mV C 0 700 C mV For this thermistor a temperature change from 20 C to 19 C will be represented by 737 A D counts if supplied with 104A The same thermistor will only change about 18 A D counts from 49 C to 50 C Selecting Thermistor Current To select the current setting for a typical 10 K thermistor determine the lowest temperature you will need to sample and select the current according to the range limits given above If the temperature you want to sample is below 10 C you should use the 10uA setting With the current set to 10uA the best resolution you will see will be a 1 0 C temperature change If for example the lower limit is 0 C you can choose either setting but there is a tradeoff in terms of resolution If you need better than 0 1 C measurement resolution you will have to change to 100uA If you need high resolution over a narrow range for a very accurate measurement you can set the current setting for the maximum resolution For example at a high temperature of 15 C you require a measurement resolution of at least 0 05 C This resolution is within the range of either set
54. d C2 are 0 and 1 respectively for both types of devices These values should be used initially for determining C1 and C2 in the methods described below The One Point method is easiest but it ignores the non linearity of the device It is most useful when a high degree of temperature accuracy is not required The Two Point method can achieve a high degree of accuracy over a narrower operating temperature range but requires two accurate temperature measurements One Point Calibration Method The calibration described in this section is independent of the calibration procedure described in sections 6 3 4 and 6 3 6 Those sections deal with the internal calibration of the 8300 module while the following calibration procedure is for calibrating the external AD590 or LM335 sensor For the most accurate possible results both calibration procedures should be performed The accuracy of this procedure depends on the accuracy of the externally measured temperature It is used to determine the zero offset of the device and it assumes that the gain slope is known 1 Allow the 8000 to warm up for at least one hour Select the desired sensor type in the setup menu 2 Set the Cl parameter to zero Set the C2 parameter to 1 3 Place the sensor at an accurately known and stable temperature Ta Connect the sensor to the 8000 for normal Constant temperature operation Allow the 8000 to stabilize at the known temperature T and read the displa
55. ded low temperature limit RLim TEC has exceeded R limits high or low Open TEC module is open Table 5 TEC Link Conditions See the section in the main Model 8000 manual of linking for a complete description of the linking process Sensors Thermistor and Thermistor Current Selection Introduction Choosing the right sensing current depends on the range of temperature you want to measure and the resolution you require at the highest measured temperature To correctly set the thermistor current you must understand how the thermistor and the 8000 interact and how temperature range and resolution values are inherent in the nature of thermistors Thermistor Range Thermistors can span a wide temperature range but their practical range is limited by their non linear resistance properties As the sensed temperature increases the resistance of the thermistor decreases significantly and the thermistor resistance changes less for an equivalent temperature change Consider the temperature and sensitivity figures below Temperature Sensitivity 20 C 5600 ohms C 25 C 439 ohms C 50 C 137 ohms C 54 Chapter 4 Temperature Controller Module Operation In the 8000 the practical upper temperature limit is the temperature at which the thermistor becomes insensitive to temperature changes The lower end of the temperature range is limited by the maximum A D input voltage of the 8000 Thermistor resistance and voltage are related t
56. difference between the set point temperature and the actual temperature to zero regardless of the gain setting An analog switch discharges the integrating capacitor whenever integration is not required to prevent unnecessary difference signal integration Bipolar Output Stage The Bipolar Output Stage consists of circuits which limit the TEC output sense the TEC output polarity sense voltage and current limit conditions as well as supply the 66 Chapter 4 Temperature Controller Module Operation 4 6 8 1 4 6 8 2 4 6 8 3 4 6 8 4 4 6 9 4 6 9 1 bipolar TEC output The following sections discuss these functions of the Bipolar Output Stage Current Limiting The output of the proportional amplifier and integrator together form the control signal Output current limiting is effected by bounding the control signal so that it is always less than the limit current The limit current is set with the front panel controls or through the GPIB The bipolar current limit levels are established by the output of the current Limit DAC Current Limit Condition Sensing Comparators sense the output to determine when output current limiting is occurring When this condition occurs the I Limit signal is sent to the microprocessor Voltage Controlled Current Source The bounded output control signal is applied to an amplifier This amplifier and the current sensing amplifier form the output voltage controlled current source The outpu
57. diode current value is entered via the LAS MDI command the 8000 will apply a new photodiode current equal to approximately one fourth 14 the previous set point The 8000 will be ready to receive the second current value when after a LAS CAL MDI query is sent the response from the 8000 is 1 Input the second actual measured photodiode current as in Step e Once the actual photodiode current value is entered via the second LAS MDI command the 8000 leaves the current calibration mode If at any time prior to the second LAS MDI a command other than LAS MDI or LAS CAL MDI is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s The OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command 6 2 7 Local Operation Laser Voltage Measurement Calibration a With the output off connect a calibrated voltmeter in parallel with a load resistor as selected Table 10 to the laser output terminals Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Chapter 6 Calibration 77 c Press the Setup soft key and set the laser current limit
58. drive the current to 25 of the initial set point The 8000 will be ready to receive the second measured current value when after a TEC CAL ITE query is sent a 1 is returned Input the second actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then drive the current to the negative current value of the initial set point The 8000 will be ready to receive the third measured current value when after a TEC CAL ITE query is sent a 1 is returned Input the third actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then drive the current to 25 of the negative current value of the initial set point The 8000 will be ready to receive the fourth measured current value when after a TEC CAL ITE query is sent a 1 is returned Chapter 6 Calibration 87 f Input the fourth actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command If at any time prior to the last TEC ITE a command other than TEC ITE or TEC ITE is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s Once the TEC ITE value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable regis
59. e Figure 24 TEC Main Screen Figure 25 TEC Setup Screen Figure 26 Thermistor Temperature Range Figure 27 Thermistor Resistance versus Temperature Figure 28 AD590 Nonlinearity Figure 29 TEC Board Module Diagram Figure 30 Ipp Calibration Circuit 1 1 1 2 CHAPTER 1 General Information Introduction This chapter describes the features options accessories and specifications of the Model 8000 Unless otherwise noted 8000 or Model 8000 refers to the Model 8000 and the Model 8008 Sections that deal with a specific model will be indicated as such Product Overview PRODUCT FEATURES O OO O Fully isolated module slots Four in Model 8000 and eight in Model 8008 GPIB IEEE 488 2 and RS 232C Interface Link feature allows inter module programming control not found in any other products Temperature Controller TEC Module 8000 only e 40 Watt 5A 8V ultra stable bipolar output e Thermistor AD590 LM335 and Pt RTD sensors Dual Temperature Controller Modules 8000 only e Two independent outputs per module e 2 5 Amps at 6 Volts 15 Watt Laser Diode Driver LDD Modules 8000 only e 200 mA to 6 Amp low noise outputs e External analog modulation e Adjustable photodiode bias voltage e Comprehensive laser diode protection features MOPA Laser Diode Driver Module 8000 only e 500 mA LDD for master oscillator section e 4 Amp LDD for power amplifier section e Connec
60. e current of the module For example 100 mV input on a 6560 module 6 A driver would equate to 60 mA of drive current However regardless of the input voltage the current cannot exceed the current limit 30 Chapter 3 Laser Diode Driver Module Operation 3 3 2 3 3 3 3 3 4 3 4 Photodiode Bias Control An adjustment is provided for 0V to 5V reverse bias adjust on single channel modules Dual Combo and MOPA modules do not have a photodiode bias control and have fixed bias at either OV or 5V Photodiode A BNC connector is provided for photodiode connections It is the same input as pins 6 and 7 in the 9 pin D connector with the anode on the shell MOPA and combo modules do not have this BNC connector CAUTION Do not disconnect the photodiode with the laser on Interlock Except on MOPA modules the interlock pins 1 and 2 must be connected together to complete the circuit and allow the laser operation Pin 1 is connected to a 5V supply through a 10 KQ resistor and pin 2 is connected to ground through a 1 KQ resistor On MOPA modules the interlock pin 9 is connected to pin 2 Connecting to Your Laser When connecting laser diodes and other sensitive devices to the module we recommend that the 8000 be powered up and the laser output be off In this condition a low impedance shunt is active across the output terminals When disconnecting devices it is only necessary to turn the laser output off
61. e For between 15 to 20 seconds an initialization screen is displayed The software version is displayed in the lower left corner of the screen During this time a self test is performed to ensure that the 8000 hardware and software are communicating If the 8000 cannot successfully complete this test an error message will be displayed After this test the 8000 is configured to the state it was in when the power was last shut off and displays the master display Chapter 2 System Operation 9 2 3 Introduction to the 8000 Front Panel 2 3 1 Front Panel Familiarization Described below are the functions of each area of the front panel as shown in Figure 1 N J WE lt A Newport Modular Controller Mode 8000 ASER OFF ON 7 8 9 menu pee MASTER ES em te a a eie POWER 1 2 3 on a LJ ie OFF Figure 1 8000 Front Panel 1 Power On Off Switch Switches on off the AC power to the unit Laser Enable On Off Switch Safety key switch that enables disables all laser outputs See sections 3 6 12 and 3 3 4 for additional information on laser interlock 3 Laser Active LED Indicates one or more laser outputs are on 4 Display Soft Keys These are the four dark keys located to the right of the display The function of these four keys varies depending on what menu is displayed See section 2 4 1 4 for a complete description of soft keys 5 MASTER Key switches to the master display from
62. e laser diode The system will also limit current set points to this value when operating in the Io mode Two conditions can be generated when the driver reaches this limit The lesser of the two is the soft current limit The soft limit indicated by ILIMIT on the status line of the Laser Main Screen indicates that the laser module is limiting the current drive to the laser diode but otherwise operating as normal The second condition is a hard limit which indicates that the current drive attempted to exceed the current limit faster than the circuitry could limit it This condition causes the laser module s output to be shutdown Both of these conditions are monitored in circuitry on the module itself and in the case of the hard limit shutdown is within microseconds of the condition being detected Vcomp The voltage compliance setting controls the shutdown of the laser module output when the forward voltage of the laser exceeds the compliance setting Like the current limit described above the voltage compliance is monitored in circuitry on the module itself allowing for shutdown within microseconds of the condition Im Lim The photodiode current limit is a software monitored limit on the current delivered from the photodiode Because this limit is a software monitored limit shutdown can occur up to a second after the condition is true Po Lim Like the Im Lim the photodiode power limit is a software monitored limit on the power deliv
63. e new value of C1 and C2 from the following calculations First determine the intermediate values U and V where C2 Ta Taz Tar Tao and C1 Ta Tai C2 6 Enter the new Cl and C2 values 4 5 3 RTD Sensors RTD sensors are not supported on dual or combination TECs The following equation is used in temperature to resistance conversions R Ro 1 C1 x t C2 xt C3 t 100 t fort lt 0 C R Ro 1 C1xt C2x for t gt 0 C where R is the resistance in Q at temperature t Chapter 4 Temperature Controller Module Operation 63 4 5 3 1 t is the temperature in C RTD Constants The constants entered for an RTD depend on the type of curve it has Table 8 shows three standard types Curve TCR Q Q C Laboratory 003926 US 003910 European 003850 cl C2 C3 3 9848x10 0 58700x10 4 0000x10 3 9692x10 0 58495x10 4 2325x10 3 9080x10 _ 0 58019x10 4 2735x10 Table 8 RTD Constants RO 100 00 100 00 100 00 The Ro constant also applies for RTD sensors It is nominally 100 00 Q but can be varied from 95 00 Q to 105 00 Q 64 Chapter 4 Temperature Controller Module Operation 4 6 4 6 1 4 6 2 TEC Module Theory of Operation Figure 29 shows the functionality of the TEC module The following sections detail the theory of operation for each of the blocks in Figure 29 To Microprocessor Optically Isolated Serial Bus Limi
64. eceive the second current value when after a LAS CAL LDI query is sent the response from the 8000 is 1 Input the second actual measured laser output current as in Step e Once the actual current value is entered via the second LAS LDI command the 8000 leaves the current calibration mode If at any time prior to the second LAS LDI a command other than LAS LDI or LAS CAL LDI is sent to the 8000 the 8000 will cancel 74 Chapter 6 Calibration 6 2 5 the calibration mode and then process the command s The OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command Local Operation Ipp Current Calibration This procedure calibrates the feedback circuits for constant Ipp and constant Ppp modes The user enters the actual value of the current as measured by an external DMM The 8000 then automatically calibrates the laser feedback circuits MOPA modules have photodiode feedback circuits on channel B only The Ipp calibration circuit is diagrammed below Use Table 10 above to select a value for the R2 resister that matches the maximum drive current of the laser diode module 9 Pin D Sub LD Cathode gt LD Anode PD Cathode gt PD Anode gt Figure 30 Ipp Calibr
65. ed below Chapter 4 Temperature Controller Module Operation 8358 3868mA 46h TEC ITE AHHHA LintTH 56 06 C Linit IteE Z2 560A Linit To 10 06 C IunitMunt Tunt kunt Heatina Out of Tol Figure 24 TEC Main Screen ISET TSET RSET iSET and vSET Indicates the set point value of current temperature resistance AD590 sensor current or LM335 sensor voltage In the screen shown above the TSET is shown ISET RSET iSET and vVSET would be seen when operating in those modes Set point can be changed with numeric keys or the knob I T R i and v Indicates the measured value of current temperature or resistance A Sens err indicates a sensor error usually caused by the sensor not hooked up or the wrong sensor selected In the screen shown above the T is shown I R i and v would be seen when operating in those modes OFF ON Indicates the state of the TEC output Pushing the adjacent soft key toggles the state Setup Pushing the adjacent soft key activates the setup screen The bottom line on the display has 6 LED elements each indicating a particular state of the laser They are defined as ILIMIT When illuminated indicates the TEC module is in current limit VLIMIT When illuminated indicates the TEC module has reached it s voltage limit TLIMIT When illuminated indicates the TEC module is outside the temperature limits defined by THI and TLO in the setup screen RLIMIT Wh
66. eet or exceed those listed Resistance 10 ohms 0 02 Metal Film 10 KQ for ITE calibration dual combo 20 KQ for 100uA calibration 200 KQ for 10uA calibration 3 kQ for LM335 sensor calibration 16 kQ for AD590 sensor calibration 100 Q for RTD sensor calibration Description Mfg Model Specification DMM HP34401A DC Amps 1 0 A 1 Resistors only Resistor High Power 1 Q 50 W for current calibration Connector D sub 15 pin male Table 11 Recommended Test Equipment Chapter 6 Calibration 79 6 3 2 Local Operation Thermistor Calibration a Measure and record the exact resistance of your metal film resistor Use nominal values of 20 KQ for the 100A setting and 200 KQ for the 10pA setting With the TEC output off connect the metal film resistor to the sensor input of the TEC Module Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Press the Setup soft key and select the appropriate thermistor 104A or 100A as the Sensor Type Press the Prev soft key to return to the single display Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC sensor calibration mode by pressing the Sensor soft key Follow the on screen instructions to complete the calibration The
67. en error The system allows the user to disable the circuit when working in an electrically noisy environment that might cause a false detection The circuit is automatically disabled in the High Bandwidth Mode PD Resp The PD Resp element is the conversion factor between photodiode current and photodiode power and is expressed in pA per mW If this value is zero the system will not operate in Po mode PD Zero The PD Zero element is the photodiode offset that is removed from the photodiode read back before any values are displayed and conversely is added to any photodiode set point The photodiode offset is a combination of any dark current or stray light picked up while the laser is off Pressing the PD Zero soft key sets this element to the photodiode current that is present on the photodiode input To clear it simply press the PD Zero soft key a second time Prev soft key Pushing the Prev soft key returns to the previous screen Laser Modulation Setup Screen Newer combo modules 8000 22 have onboard modulation circuits The modulation setup screen has six variables Mod Enable Mod Frequency Mod Amplitude Mod Type Io min and Io max Mod Amplitude Io min and Io max are interrelated see below Mod Enable Mod Enable turns the modulation circuit on or off 38 Chapter 3 Laser Diode Driver Module Operation 3 5 4 2 3 5 4 3 3 5 4 4 3 5 4 5 3 5 5 Mod Frequency The modulation circuit is capable of a f
68. en a TEC is not operating within tolerance This can be done in one of two ways The first and simplest would be to define a link condition with the TEC module as the source Out of Tol as the condition Turn Off as the action and the laser module as the target Alternately if the system was being operated over IEEE 488 or RS 232 once the TEC was within tolerance its OUTOFF register could be set to turn the TEC off when out of tolerance Then enable the TEC OFF bit in the laser s OUTOFF register This will cause the TEC to shutdown when it goes out of tolerance and the laser to shutdown because the TEC is OFF The disadvantage of this second method would be that the laser would shutdown if any TEC were off which might not be the desired operation Also you would have to disable the Out of Tolerance bit in the TEC s OUTOFF register before you could turn the TEC back on Prev soft key Pushing the Prev soft key returns to the previous screen Link Conditions The Laser module supports the following link conditions Chapter 4 Temperature Controller Module Operation 53 4 5 4 5 1 4 5 1 1 4 5 1 2 Conditi Description on On TEC output is on Off TEC output is off Out Tol TEC is out of tolerance In Tol TEC is in tolerance I Lim TEC is current limiting VLim TEC has reached its voltage limit T Lim TEC has exceeded temperature limit low or high Th Lim TEC has exceeded high temperature limit Tl Lim TEC has excee
69. en illuminated indicates the TEC module is outside the reference limits defined by RHI VHI HI and RLO VLO iLO in the setup screen Chapter 4 Temperature Controller Module Operation 49 4 4 3 4 4 3 1 4 4 3 2 Heating Cooling When illuminated indicates that the TEC is heating or cooling Out of Tol When illuminated indicates that the TEC is out of tolerance as defined by Tol Time and Tol Temp in the setup screen TEC Setup Screen The TEC Setup screen is shown in Figure 25 Each section is described below in detail 2356 SHBEMA 44h TEC Therm 1080A Mode Const T a4 Limit Ite 7 40 1 12797 x 18 3 Limit THH 5S 2otlixib 4 Limit Tio LEB E Harro xi r f TolTime HES Tol Tempe appen Frew Figure 25 TEC Setup Screen Sensor Selects the temperature sensor type used in your TEC mount If the None type not available in the dual TEC module is selected only the ITE mode is allowed This type is intended for applications running without a temperature sensor After selecting desired sensor See the following sections for discussions of the various sensor types All TEC modules support the thermistor sensors 10uA and 1004A range Single channel TEC modules add support for the AD590 LM335 and RTD sensors Gain The Gain function controls two parameters of the hybrid PI control loop proportional gain and integration time When the actual temperature and the set point are different an error voltage is ge
70. ered from the photodiode For this limit to function the user must set a PD Resp value other than zero Because this limit is a software monitored limit shutdown can occur up to a second after the condition is true Tol Time and Tol lop The Tol Time and Tol Iop elements are used for determining when the laser is in tolerance The Tol Time value is expressed in seconds and can range from 0 001 Chapter 3 Laser Diode Driver Module Operation 37 3 5 3 9 3 5 3 10 3 5 3 11 3 5 3 12 3 5 4 3 5 4 1 seconds to 50 seconds The Tol Iop value is displayed in mA and can range from 0 1 mA to 100 mA When operating in Im or Po modes The Tol Iop setting is ignored and fixed values of 50 pA and 50 mW respectively are used The laser is considered in tolerance after it has been within the tolerance setting for the set number of seconds If at any time it goes outside the tolerance range the time restarts at zero As an example if the Tol Time is set to 5 seconds the Tol Iop is set to 2 mA and the current set point was 1000 mA the laser module would have to stay within 998 mA and 1002 mA to be within tolerance Out of tolerance is indicated by a Out Of Tol status field on the bottom of the Laser Main Screen Intermittent Contact Int Control The Int Control setting controls the detection of intermittent contacts caused by faults cables or connectors An intermittent contact if enabled will shutdown the laser with an op
71. ese conditions can be disabled by clearing the appropriate bits in the TEC OUTOFF register See the Computer Interfacing Manual for additional information The TEC Connectors On the TEC Module a 15 pin D connector is used for input and output connections to the series 700 mounts as shown by the pin out diagram below Chapter 4 Temperature Controller Module Operation 47 4 3 1 4 4 4 4 1 4 4 2 Pin Description 1 2 TE 3 4 TE 5 6 Ground 7 Sensor 8 Sensor Table 4 TEC Connector Pintouts TEC Grounding Consideration The TEC output of the module is isolated from chassis ground allowing either output terminal to be grounded at the user s option TEC Module Operation Quick Start After the power on sequence is complete the 8000 goes to the Master display To set up a TEC module press the MENU button then the Modules soft key then select the slot that the module resides in and finally the Setup soft key At this point the display shows all TEC parameters Using the cursor keys the numerical keypad knob and ENTER select the desired functions and set the parameter values When finished return to TEC display with Prev previous soft key Enter the desired set point value using the numerical key pad and ENTER or use the knob Press the OFF soft key to operate the TEC The OFF changes to ON To turn the TEC off press the ON soft key TEC Main Screen The TEC main screen is shown Figure 24 and describ
72. ffecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 3 12 Remote Operation Ite Current Calibration Single Channel TEC Modules a With the output off connect a 1 Q 50 W resistor and a calibrated ammeter in series across the laser output terminals If an ammeter with the appropriate current ratings is unavailable connect a 1 Q 50 W resistor across the laser output terminals and use a calibrated DMM to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance Enter the TEC CHAN command to select the channel suchannel to be calibrated Send TEC CAL ITE to enter ITE calibration mode Chapter 6 Calibration 85 6 3 13 The module will be placed in ITE mode limit set to 50 of full scale plus 100 mA and the ITE set point set to 50 of full scale The 8000 will be ready to receive the first measured current value when after a TEC CAL ITE query is sent a 1 is returned c Input the actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then drive the current to 25 of the initial set point The 8000 will be ready to receive the second measured current value when after a TEC CAL ITE query is sent a 1 is returned d Input the second actual current as an lt
73. g the calibration Chapter 6 Calibration 73 6 2 4 Remote Operation Current Source Io Calibration a With the output off connect a load resistor as selected Table 10 and a calibrated ammeter in series across the laser output terminals If an ammeter with the appropriate current ratings is unavailable connect a calibrated DMM across the laser output terminals to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance Select the channel subchannel via the LAS CHAN command Set the current limit to one half scale plus 100 mA via the LAS LIM LDI command output bandwidth as desired via the LAS MODE I LAS MODE ICW or LAS MODE ILBW command and current set point to one half scale via the LAS LDI command Enter the LAS OUTPUT ON command to turn the laser output on Enter the laser LDI calibration mode by issuing the LAS CAL LDI command Input the actual measured laser output current as an lt nrf value gt via the LAS LDI lt nrf value gt command The 8000 will be ready to receive the current value when after a LAS CAL LDI query is sent the response from the 8000 is 1 Once the actual current value is entered via the LAS LDI command the 8000 will apply a new current equal to approximately one fourth the previous set point The 8000 will be ready to r
74. ge setting is correct on the power input module and correct fuses are installed per section 5 2 before connecting to an AC source The 8000 is shipped set for 120 VAC and a caution sticker is placed on the input power connector CAUTION Do not exceed 250 VAC on the line input Do not operate with a line voltage that is not within 10 of the line setting Too low of an input voltage may cause excessive ripple on the DC supplies Too high of an input voltage will cause excessive heating WARNING To avoid electrical shock hazard connect the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaution can result in severe injury or death 7 Chapter 2 System Operation 2 2 2 2 2 3 2 2 4 2 2 5 Tilt Foot Adjustment The 8000 has front legs that extend to make it easier to view the LED displays To use them place the 8000 on a stable base and rotate the legs downward until they lock into position Rack Mounting The 8000 may be rack mounted by using a 8000 rack mount kit All rack mount accessory kits contain detailed mounting instructions Ventilation Requirements Rear panel area needs 2 to 4 inches of clearance for air circulation Power Up Sequence With the 8000 connected to an AC power source set the power switch to I or ON to supply power to the instrument and start the power up sequence During the power up sequence the following takes plac
75. ge that is closest to your expected nominal RMS line voltage The voltage selection is set for 120 VAC prior to shipping A caution sticker is then placed over the input power connector to help insure the customer checks for proper voltage CAUTION Do not exceed 250 VAC on the line input Do not operate with a line voltage that is not within 10 of the line setting Too low of an input voltage may cause excessive ripple on the DC supplies Too high of an input voltage will cause excessive heating GND Post Provides access to chassis ground which is also an earth ground as long as a standard 3 wire line cord is used This is a protective conductor terminal to be used to achieve chassis grounding requirements when the main connectors don t provide an earth ground terminal Use a minimum of 18 gauge wire to connect to this terminal Power Supplies AC power is supplied through the rear panel input power connector which provides in line transient protection and RF filtering The input power connector contains the fuses and the switch to select series or parallel connection of the transformer primaries for operation at 100 VAC 120 VAC 220 VAC or 240 VAC Module Power Supplies There are separate module power supplies for each slot which contains either a laser driver and or a TEC controller These linear supplies provide analog and digital circuit power to each module as well as laser TEC drive and photodiode bias C
76. hapter 2 System Operation 23 Main Supply Transformer Transformer Module 1 Supply Power Entry Transformer Module 2 Module Supply upply gt 8000 4 Supplies 8008 8 Supplies Figure 12 Power Supply Block Diagram 2 6 2 Main Supply This OEM linear supply provides digital circuit power for all functions except the module slots It also provides fan power and RS232 drive 2 7 Warm Up and Environmental Consideration Operate the 8000 at an ambient temperature in the range of 0 to 40 C Storage temperatures should be in the range of 20 to 60 C To achieve rated accuracy let the 8000 warm up for 1 hour For greatest accuracy recalibrate when ambient temperature changes more than a few degrees CAUTION Operating above 40 C can cause excessive heating and possible component failures 3 1 2 C HAPTER 3 Laser Diode Driver Module Operation Laser Diode Driver Module Introduction The 8500 and 8600 Series laser modules are precision current source modules for use in the 8000 Modular Controller It may be installed in any of the bays at the rear of the 8000 and may be interchanged with any other module Features of the 8500 and 8600 Series include Service free modularity calibration information is stored on the module Closed case calibration High stability low noise design Flexible setup with 8000 Save Recall front panel functions Photodiode feedback c
77. hrough Ohm s Law V I x R The 8000 supplies current to the thermistor either 10 WA or 100 uA and as the resistance changes a changing voltage signal is available to the thermistor inputs of the 8000 The 8000 will over range when the input voltage exceeds about 5 Volts Figure 26 graphically shows the lower temperature and upper voltage limits for a typical 10 k Ohm thermistor The practical temperature ranges for a typical 10 K thermistor a 10 K thermistor has a resistance of 10 k Ohms at 25 C are given in the table below Sensing Current Temperature Range 10 pA 51 to 40 C 100 pA 10 to 100 C USING TYPICAL 102 25 C THERMISTOR THERMISTOR VOLTAGE 1 00 DEGREES C 10nA 100 pA EE Denotes practical range with typical 10K thermistor KW Denotes measurable range with typical 10K thermistor Figure 26 Thermistor Temperature Range Chapter 4 Temperature Controller Module Operation 55 4 5 1 3 4 5 1 4 4 5 1 5 Temperature Resolution You must also consider measurement resolution since the resolution decreases as the thermistor temperature increases The 8000 uses an A D converter that has a maximum resolution of about 76 UV The microprocessor converts this digital number to resistance stores this resistance then converts it to a temperature using the Steinhart Hart equation and stores this temperature A temperature change of one degree centigrade will be represented by a greater resistan
78. ifications Laser Output Output Current Range mA Output Current Resolution mA 16 bit Output Current Accuracy Compliance Voltage Temperature Coefficient Full Scale Short Term Stability 1 hr Full Scale Long Term Stability 24 hr Full Scale Noise Ripple rms 7 Current Limit Range Resolution Accuracy Internal Function Generator Waveforms Frequency Range 1 Frequency Range 2 Squarewave Duty Cycle 5 Independent Output Set Points Frequency Jitter Frequency Accuracy Amplitude Accuracy Sinewave Total Harmonic Distortion Squarewave risetime Optional Sync Out TTL CMOS level Photodiode Input Range Stability Full Scale 24 hours Accuracy Temperature Coefficient Full Scale C Photodiode Reverse Bias 10 Measurement Display Output Current Range mA Output Current Resolution mA Output Current Accuracy Forward Voltage Range Volts Forward Voltage Resolution mV Forward Voltage Accuracy Photodiode Current Range uA Photodiode Current Resolution uA Photodiode Current Accuracy PD Resp Range uA mW PD Resp Resolution uA mW Optical Power Range mW 8601 8C 0 to 100 mA 0 0015 0 03 5 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 uA 0 to 100 mA 1 mA 2 mA Sine amp square wave 200 Hz to 2 kHz 2 kHz to 300 kHz 50 Imax gt Imin lt 1 rms 2 5 5 lt 2 lt 500 ns Sine Square zero crossing sync
79. ing the instrument parameters When a save operation is performed all of the parameters which are currently in effect on the 8000 are stored The user selects a bin number for saving the parameters Then when that bin number is recalled the 8000 is restarted and the parameters are reconfigured to the previously stored values A special bin 0 is reserved for the reset state Recalling bin 0 will reset all modules in the system to factory defaults Chapter 2 System Operation 19 2 4 9 Linking Screen See Condition Action Tat Dut Tol Turndff ib Hone Clr All Hone Hone Hone Hone Hone Palin Hone 1 Z 3 4 J 5 Figure 9 Link Screen The linking screen allows the condition of one module to affect one or more other modules in the system The Clr All soft key allows clearing of all defined links To clear a single link simply change the Sre field to None The system supports up to 32 links As an example of linking consider a system containing a laser and TEC module in slots 1 and 2 respectively The TEC module cannot operate when the laser is off because condensation will form on the laser and may damage it However the TEC must be turned on whenever the laser is on to protect it from overheating First program the TEC high and low temperature limits to the operating range of the laser The following three links will then ensure these conditions are met Sre Condition Action Tgt 1 1
80. int is the actual drive current A set point of 1000 mA will cause the module to drive 1000 mA through the laser diode assuming the Io Lim is set at or above 1000 mA In Im mode the set point is the desired amount of photodiode current in pA Unlike the Io mode Im mode will drive whatever current is necessary though the laser diode up to the limit to achieve the set point photodiode current Po mode is simply an extension on the Im mode allowing the user to operate the system in milliwatts of power The photodiode power set point in mW is converted to photodiode current using the PD Resp value from the setup screen Bandwidth 36 Chapter 3 Laser Diode Driver Module Operation 3 5 3 3 3 5 3 4 3 5 3 5 3 5 3 6 3 5 3 7 3 5 3 8 This setting is used to control noise and laser current modulation rates Allowable settings are Low Low CW and High Low CW allows a maximum modulation rate of 30 Hz and operates with the least noise Low allows up to 10 kHz modulation while High allows full bandwidth modulation Modulation is disabled in Im and Po modes The MOPA module does not have this setting Modulate MOPA Modules Only This setting is used to select which laser driver is modulated by the external modulation input The choices are Osc for the oscillator driver or Amp for the amplifier driver lo Lim As one of the safety features of the Laser modules the Io Lim sets a maximum allowable current drive for th
81. ion Circuit Notes 1 2 When applying high speed modulation to the laser diode this circuit may reduce the maximum modulation frequency The temperature controlled mount is earth grounded through pins 5 and 6 of the TEC D sub connector 28 Chapter 3 Laser Diode Driver Module Operation 3 2 3 2 1 3 2 2 3 2 3 3 3 3 Onall 700 series mounts the temperature control cable must be connected for maximum protection 4 For maximum laser diode protection the diode should be recessed as in the 700 C mount Laser Safety Features Conditions Which Can Automatically Shut Off the Laser Output Laser Open Circuit Laser Compliance Voltage Limit Laser Hard Current Limit Laser Interlock State Changed Laser Photodiode High Current Limit Laser Photodiode High Power Limit Laser Intermittent Contact if enabled default disabled A Linked Function With the exception of the linked functions some of these conditions can be disabled by clearing the appropriate bits in the Laser OUTOFF register See the Computer Interfacing Manual Key switch Interlock The LASER ENABLE key switch on the front panel will shutoff or not allow to be turned on any laser outputs while in the OFF position per CDRH requirements Turn On Delay The 8000 is CDRH Compliant with a user programmable turn on delay The default turn on delay is three seconds but is user programmable from 0 to 30 seconds The delay setting is in the
82. isplay To set up a laser module press the MENU button then the Modules soft key then select the slot that the module resides in and finally the Setup soft key At this point the display shows all laser parameters Using the cursor keys the numerical keypad knob and ENTER select the desired functions and set the parameter values When finished return to laser display with Prev previous soft key Enter the desired set point value using the numerical key pad and ENTER or use the knob Press the OFF soft key to operate the laser The OFF changes to ON To turn the laser off press the ON soft key 34 Chapter 3 Laser Diode Driver Module Operation 3 5 2 Laser Main Screen The laser main screen in shown in Figure 18 and described in detail below Certain features are not available on some modules t HAHH LinitIo ShbHmMA Vcomp S AG Tudit Imudit P unit Open Out of Tol Figure 18 Laser Main Screen Io Im or Po When these fields are editable such as the Io field in the figure above they indicate the corresponding set point Non editable fields such as the Im and V fields above indicate measured values such as laser current or voltage photodiode current or photodiode power OFF ON Indicates the state of the laser s output Pushing the adjacent soft key toggles the state Mod This button will be available only on 8000 22 combo modules while in Io mode Pushing the adjacent soft key activates the m
83. l key lock in off position shutdown all laser outputs E 903 Loading of a saved bin shutdown module output 9 Specifications 9 1 Model 8000 Modules 9 1 1 8540M MOPA Laser Diode Driver Module Specifications Oscillator Amplifier Laser Output Output Current Range mA 0 to 500 mA 0 to 4 000 mA Output Current Resolution mA 0 0076 0 0610 Output Current Accuracy 0 03 15 pA 0 03 120 pA Compliance Voltage 5 Volts 5 Volts Temperature Coefficient Full Scale lt 50 ppm C lt 50 ppm C Short Term Stability 1 hr Full Scale lt 10 ppm lt 10 ppm Long Term Stability 24 hr Full Scale lt 50 ppm lt 50 ppm Noise Ripple rms lt 4 0 pA lt 10 pA Current Limit Range 0 to 500 mA 0 to 4 000 mA Resolution 1 mA 1 mA Accuracy 2 mA 5mA Analog Modulation Input range Input Impedance 0 to 10V 10kQ 0 to 10V 10kQ Transfer Function 50 mA V 400 mA V Bandwidth 3 dB 10 DC to 500 kHz DC to 100 kHz Midband Crosstalk gt 40 dB below gt 10 dB below Amplifier Signal Oscillator Signal Photodiode Input Temperatire Coefficient Full Scale C N A lt 0 02 Range N A 0 20mA Stability Full Scale 24 hours N A 0 02 Accuracy N A 0 004 1 pA Photodiode Reverse Bias 10 N A 5 Volts Measurement Display Output Current Range mA 0 to 500 00 0 to 4 000 0 Output Current Resolution mA 0 01 0 1 Output Current Accuracy 0 02 20 pA 0 02 200 pA Forward Voltage Range Volts 0 000 t
84. loading a 10 kQ resister across the sensor input and selecting the Thermistor sensor the system will 86 Chapter 6 Calibration read the termperature as a constant 25 C Setting a temperature of 20 C and 30 C with the output on will force it to go to the positive and negative limit respectively allowing the limit set point to simulate an ITE current set point a Connect a 10 kQ resister across the sensor input With the output off connect a 1 Q 50 W resistor and a calibrated ammeter in series across the laser output terminals If an ammeter with the appropriate current ratings is unavailable connect a 1 Q 50 W resistor across the laser output terminals and use a calibrated DMM to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance Enter the TEC CHAN command to select the channel suchannel to be calibrated Send TEC CAL ITE to enter ITE calibration mode The 8000 will select the Thermistor sensor and place the system in constant temperature mode The ITE current limit is set to 50 of full scale and the output turned on The 8000 will be ready to receive the first measured current value when after a TEC CAL ITE query is sent a 1 is returned Input the actual current as an lt nrf value gt via the TEC ITE lt nrf value gt command The 8000 will then
85. lost upon detecting any change in the module configuration such as installing a new module CAUTION Although ESD protection is designed into the module operation in a static fee work area is recommended CAUTION Do not plug in or unplug a module with the AC power on To install the module into the 8000 follow these steps 45 46 Chapter 4 Temperature Controller Module Operation 4 2 4 2 1 4 3 1 Turn the 8000 power off Installing a module with the 8000 on can damage the module and the 8000 2 Place the module into an open bay on the back of the 8000 and slide the module into place There are tracks at the top and bottom of the bay which guide the module into place Screw the Module Locking Screws into the back panel to secure the module To remove the module from the 8000 follow these steps 1 Turn the 8000 power off Removing a module with the 8000 on can damage the module and the 8000 2 Unscrew the Module Locking Screws which secure the module to the 8000 back panel 3 Grasp the module by handle which extends from the bottom of the back panel Gently but firmly pull the module out of the 8000 TEC Safety Features Conditions Which Will Automatically Shut Off the TEC Output High Temperature Limit Low Temperature Limit R Limit Sensor Open TEC Module Open Sensor Select changed Sensor Shorted Any Linked Functions With the exception of the linked functions each of th
86. lution mV Forward Voltage Accuracy Photodiode Current Range uA Photodiode Current Resolution uA Photodiode Current Accuracy PD Resp Range uA mW PD Resp Resolution uA mW Optical Power Range mW Optical Power Resolution mW 8501 8D 0 to 100 mA 0 0015 0 03 5 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 uA 0 to 100 mA 1 mA 2 mA 0 5mA pas 0 02 0 004 0 5 LA lt 0 02 none 0 to 100 00 0 01 0 02 10 uA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 100 00 0 01 15 True rms 3Hz to 300 kHz FS resistive load 16 reading fixed error 8505 8D 0 to 500 mA 0 0076 0 03 15 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2pA 0 to 500 mA 1 mA 2 mA 0 5mA a a 0 02 0 004 0 5 LA lt 0 02 none 0 to 500 0 0 01 0 02 20 pA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 500 00 0 01 Dual Laser Diode Driver LDD Modules 8510 8D 0 to 1 000 mA 0 0153 0 03 30 pA 3 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 2 5 pA 0 to 1 000 mA 1 mA 2 mA 0 5mA pas ms 0 02 0 004 0 5 LA lt 0 02 none 0 to 1 000 0 0 1 0 02 200 pA 0 000 to 3 000 0 1 0 005 0 3 mV 5 5 000 0 1 0 01 0 5 pA 0 00 to 600 00 0 01 0 00 to 1000 0 0 01 106 Chapter 9 Specifications 9 2 2 Spec
87. m Address Country Date P O Number Phone Number Item s being returned Model Serial Description Reason for return of goods please list any specific problems List all control settings and describe problem Attach additional sheets as necessary Show a block diagram of your measurement system including all instruments connected whether power is turned on or not Describe signal source If source is laser describe output mode peak power pulse width and repetition rate Where is measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Variation Frequency Ambient Temperature Any additional information If special modifications have been made by the user please describe below 8 1 CHAPTER 8 Error Messages Introduction Error messages may appear on the display when error conditions occur in the respective functions of the 8000 For example a current limit error in the TEC module will be displayed In remote operation the current error list can be read by issuing the ERR query When this is done a string will be returned containing all of the error messages which are currently in the error message queue The errors codes are numerically divided into areas of operation as shown below Error Code Range Area of Operation E 001 to E 099 Internal Program Errors E 100 to E 19
88. module out 3 1 3 Laser Diode Protection Requirements Laser diodes are extremely sensitive to electrostatic discharge and current spikes transients Damage can result in reduced output power shift in threshold current changes in beam divergence and ultimately failure to lase LED like output only Newport precision current sources and controllers offer the most advanced laser protection features available including power line filters clamping current limits and slow start up circuits However no instrument can protect against all conditions especially ESD at the laser In order to optimize immunity from radiated or conducted electromagnetic energy e g static discharge the following guidelines for the laser diode must be adhered to ESD is the primary cause of premature laser failure As a minimum use anti static wrist straps grounded with 1 MQ resistor anti static floor coverings grounded soldering irons and grounded work areas Ionized air blowers are also recommended e Laser diode leads should be shorted whenever the laser is transported or stored Select a driver module with the lowest possible current rating that still exceeds the laser s maximum operating current For example a laser with a maximum operating current of 150 mA should be driven by the 6505 500mA laser driver module Chapter 3 Laser Diode Driver Module Operation 27 Recess the laser diode inside a metal shielded enclosure such a
89. mpleting the calibration 6 2 6 Remote Operation lpp Current Calibration a With the laser output off connect a calibrated ammeter to the photodiode anode output of the module and connect the circuit of Figure 30 to the laser and photodiode outputs If a calibrated ammeter with 0 1 uA resolution is not available place a calibrated DMM with 0 1 mV resolution to measure the voltage across the resistor R3 as shown in Figure 30 Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance Select the channel subchannel via the LAS CHAN command Set the laser current limit to full scale via the LAS LIM LDI command Set the photodiode current set point to full scale via the LAS MDI command Place the unit into constant photodiode current mode via the LAS MODE MDI command 76 Chapter 6 Calibration Enter the LAS OUTPUT ON command to turn the laser output on Enter the LAS CAL MDI command to place the 8000 in its laser photodiode current calibration mode After a few seconds the 8000 will be ready for the actual photodiode current to be entered via the LAS MDI command The measured value of the current should not be entered until the 8000 is ready to receive it The 8000 will be ready to receive the current value when after a LAS CAL MDI query is sent the response from the 8000 is 1 Once the actual photo
90. n allowing the dial and keypad lockout settings to be changed while in this screen Audible Beep controls the system s audible beeper The beeper indicates errors invalid data entry and other situations where the 8000 needs to alert the user On Delay controls the delay time from the moment a Laser Diode Driver is turned on by the user to the actual time the output is energized The delay time is programmable from 0 seconds to 30 seconds The default setting is 3 seconds Key Rate this controls the speed at which when a key is held down it repeats Settings are Slow Medium and Fast Dial Rate like the Key Rate setting this controls the acceleration of the dial as it is turned Settings are Slow Medium and Fast Dial Tick when set to Yes the dial will produce a tick sound for each increment or decrement of the dial Master this controls the format of dual and combo modules on the master display see section 2 4 4 Settings are Expanded and Condensed Save Recall Screen 18 Chapter 2 System Operation pave Recall Contig Save Recall Bin 1 Figure 8 Save Recall Screen The Save and Recall functions are used to store and retrieve 8000 setup configurations for future use For example a specific test setup may be saved for later use and then another setup may be used presently Then when the user desires to perform the specific test its setup is simply recalled Non volatile memory is used for sav
91. n circuit disabled output 96 Chapter 8 Error Messages Error Code Explanation E 504 Laser current limit disabled output E 505 Laser voltage limit disabled output E 506 Laser photodiode current limit disabled output E 507 Laser photodiode power limit disabled output E 508 TEC link disabled laser E 509 Laser short circuit disabled output E 510 Laser out of tolerance disabled output E 511 Laser control error disabled output E 512 Analog section status is all 1 s or 0 s power down E 513 Serial EPROM checksum error E 514 Laser mode change disabled output E 515 Laser bandwidth change disabled output E 516 Incorrect Configuration for Calibration Sequence to start E 517 Calibration for Laser Diode current must have the output on to start E 518 Calibration for the Monitor Diode must have the output on and the sensitivity set to zero to start E 519 Setting a measurement is only valid during the calibration phase for that measurement User has tried to calibrate a measurement without first entering the required calibration mode E 520 User cannot change the Laser Current set point while operating in a calibration mode for another measurement E 531 Laser link condition forced output on E 532 Laser link condition forced output off E 533 Attempted to select non laser channel for laser operation E 900 Calculation Error shutdown output E 901 System over temperature shutdown all outputs E 902 Front laser enable pane
92. nect the metal film resistor to the sensor input of the TEC Module Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Press the Setup soft key and select the RTD as the Sensor Type Press the Prev soft key to return to the single display Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC sensor calibration mode by pressing the Sensor soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 3 9 Remote Operation RTD Calibration a Measure and record the exact resistance of your 100 Q metal film resistor With the TEC output off connect the metal film resistor to the sensor input of the TEC Module Enter the TEC CHAN command to select the channel suchannel to be calibrated Send TEC SENS 5 to select the RTD sensor followed by the TEC CAL SEN to enter sensor calibration mode 6 3 10 6 3 11 Chapter 6 Calibration 83 The 8000 will be ready to receive the resistance when after a TEC CAL SEN query is sent a 1 is returned c Input the actual resistance in ohms of the metal film resistor as an
93. nerated This error voltage is directly related to the difference in the actual and set point temperatures The error voltage is then amplified by the proportional gain This amplified error voltage controls the amount of current driven through the TEC 50 Chapter 4 Temperature Controller Module Operation 4 4 3 3 4 4 3 4 4 4 3 4 1 The higher the gain the more current will be driven for any given temperature difference with the maximum current being determined by the current limit The error voltage also drives an integrator The integrator s output also controls the amount of current being driven through the TEC The integrator is an amplifier whose gain is proportional to time The longer a given error voltage is present the more current will be driven through the TEC with the maximum current being determined by the current limit The speed at which the integrator s output increases is the integration time which can be Slow or Fast Some TEC modules do not support the Slow setting and therefore omit the Fast designator in the range of settings The allowed Gain values are 0 2 Slow 0 6 Slow 1 Slow 1 Fast 2 Slow 3 Fast 5 Fast 6 Slow 10 Slow 10 Fast 20 Slow 30 Fast 50 Fast 60 Slow 100 Fast or 300 Fast The number actually defines the proportional loop gain The slow fast suffix indicates the speed at which the integrator s output increases The slow setting allows for larger masses or greater distan
94. nrf value gt via the LAS LDV lt nrf value gt command The 8000 will be ready to receive the value when after a LAS CAL LDV query is sent the response from the 8000 is 1 Once the actual voltage value is entered via the LAS LDV command the 8000 will apply a new current equal to approximately one fourth the previous set point The 8000 will be ready to receive the second voltage value when after a LAS CAL LDV query is sent the response from the 8000 is 1 78 Chapter 6 Calibration g Input the second actual measured voltage as in Step e h Once the actual voltage value is entered via the LAS LDV command 6 3 6 3 1 the 8000 leaves the current calibration mode If at any time prior to the second LAS LDV a command other than LAS LDV or LAS CAL LDV is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s The OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command TEC Calibration This chapter describes how to calibrate the 8300 8600 Series modules Recommended Equipment Recommended test equipment for calibrating the module is listed in Table 11 Equipment other than that shown in the table may be used if the specifications m
95. ntended to keep the 8000 screen free of error messages while operating in remote mode Use remote screen is intended to help improve throughput on fully loaded 8000 systems Although throughput improvement is not significant it may reduce slightly the latency time between the sending of a GPIB command and the actual time the command is processed When this setting is Yes the 8000 will switch to a remote screen when entering remote mode although the MENU and MASTER buttons can be used to switch out of this screen When leaving remote mode the 8000 will switch to the master display unless the user has left the remote screen The GPIB Address is the IEEE 488 device address assigned to the 8000 Valid addresses are to 31 Terminal Mode enhances the interface with the 8000 when communicating via the RS232 in a ANSI VT100 compatible serial terminal Chapter 2 System Operation 21 2 4 11 1 2 5 2 5 1 2 5 2 Speed sets the baud rate of the RS232 serial port See the Computer Interfacing Manual for additional information on Terminal Mode and Speed Error Message Control Error messages may appear on the display when error conditions occur which force the output off or reflect hardware errors in the 8000 Chapter 8 contains an explanation of the error message which may be reported by the 8000 Display of error messages on the 8000 screen may be disabled while in remote mode by setting Display Errors While Remote to No Error
96. o 5 000 0 000 to 5 000 Forward Voltage Resolution mV 0 1 0 1 Forward Voltage Accuracy 0 005 0 3 mV 0 005 0 3 mV Photodiode Current Range uA N A 15 20 000 Photodiode Current Resolution uA N A 0 1 Photodiode Current Accuracy N A 0 01 1 pA PD Resp Range uA mW N A 0 00 to 600 00 PD Resp Resolution uA mW N A 0 01 Optical Power Range mW N A 0 00 to 4000 0 1 reading fixed error True RMS 3Hz to 300 kHz full scale resistive load Modulation input can be switched in setup screen to either master oscillator or power amplifier section only one section can be modulated at a time 98 Chapter 9 Specifications Optical Power Resolution mW N A 0 01 9 1 2 Specifications Specifications 8350 TEC Output Maximum Current 5 Amps Maximum Voltage 8 Volts Typical Power 40 Watts TE Current Resolution mA TE Current Accuracy mA Current Limit Range Accuracy Ripple Noise rms Short Term Stability 1 hour 30 C Long Term Stability 24 hour 30 C Temperature Coefficient C C Display Range Temperature Resistance 10 uA Resistance 100 uA Resistance RTD LM335 Voltage AD590 Current TE Current Resolution Temperature Resistance 10 uA Resistance 100 uA Resistance RTD LM335 Voltage AD590 Current TE Current Accuracy Temperature Resistance 10 uA Resistance 100 uA Resistance RTD LM335 Voltage AD590 Current TE Current 0 153 0 to
97. o terminal thermistors have a non linear relationship between temperature and resistance The resistance verses temperature characteristics for a family of similar thermistors is shown in Figure 27 It has been found empirically that the resistance verses temperature relationship for most common negative temperature coefficient NTC thermistors can be accurately modeled by a polynomial expansion relating the logarithm of resistance to inverse temperature The Steinhart Hart equation is one such expression and is given as follows 1 T A B Ln R C La R Where T is in KELVIN To convert T to C subtract 273 15 Once the three constants A B and C are accurately determined only small errors in the calculation of temperature over wide temperature ranges exist Table 6 shows the results of using the equation to fit the resistance verses temperature characteristic of a common 10 k Ohm at room temperature thermistor The equation will produce temperature calculation errors of less than 0 01 C over the range 20 C to 50 C Chapter 4 Temperature Controller Module Operation 57 50 00 20 00 10 00 R T Actual First Third Order Order Fit Eq 1 Fit Eq 2 97072 20 00 0 00 0 32 55326 10 00 0 00 0 06 32650 0 00 0 00 0 09 19899 10 00 0 00 0 15 12492 20 00 0 00 0 13 10000 25 00 0 00 0 08 8057 30 00 0 00 0 01 5326 40 00 0 00 0 20 3602 50 00 0 00 0 50 Table 6 Comparison of Curve Fitting Equations In practice
98. odiode feedback functions Instructions and data are sent over the serial interface to the optical barrier Status and data are serially passed back to the microprocessor 3 6 2 Limit DAC The microprocessor loads the current limit value into the 12 bit DAC The Limit DAC converts a digital limit signal from the microprocessor to a voltage which Chapter 3 Laser Diode Driver Module Operation 41 3 6 3 3 6 4 3 6 5 3 6 6 3 6 7 3 6 8 becomes the Limit Set Point voltage for the Output Stage The current limit value is updated at power up at a bin recall and whenever a LIM I value is changed Set Point DAC The microprocessor loads the current set point value into the 16 bit DAC The Set Point DAC converts a set point value from the microprocessor to a voltage which becomes the current or Ipp set point input to the laser output stage The laser current set point value is updated at power up at a bin recall and whenever a laser set point value is changed A D Converter The 16 bit A D converter measures the limit current actual current and photodiode current Current Source Voltage The current source voltage is formed by taking the unregulated DC voltage from the power supply and passing it through a regulator and the associated circuitry Output Shorting A relay shorts the LD ANODE and LD CATHODE terminals whenever the laser output is turned off At the same time a FET is switched on to shunt any current which
99. odulation setup screen Setup Pushing the adjacent soft key activates the setup screen The bottom line on the display has 6 LED elements each indicating a particular state of the laser They are defined as ILIMIT When illuminated indicates the unit is current limiting ImLIMIT When illuminated indicates the unit has exceeded the monitor photodiode current limit PLIMIT When illuminated indicates the unit has exceeded the monitor photodiode power limit Open When illuminated indicates the system has detected an open circuit Only detected when the unit is on Chapter 3 Laser Diode Driver Module Operation 35 3 5 3 3 5 3 1 3 5 3 2 Short When illuminated indicates the system has detected a short circuit Only detected when the unit is on Out of Tol When illuminated indicates the unit is out of tolerance as defined by the Tol Time and Tol Iop setings in the Laser Setup Screen Laser Setup Screen The laser setup screen is shown in Figure 19 and described in detail below Certain features are not available on some modules 2560 600m LID Mode Int Contact Disable Bandwidth Low FI FkFesp _BB uA mH To Limit SA imA FI Zero HAAA Wom HEAL Im Limit 1B UA Fo Limit BEBE mb Tol Time L s Tol Top 14 6mA Figure 19 Laser Setup Screen Mode The Mode setting controls how the laser driver current is controlled There are three modes Io Im and Po In the Io mode the active set po
100. oller Module Operation 45 5 4 1 Temperature Controller TEC Module 4 1 1 Introduction 4 1 2 Installation 4 2 TEC Safety Features 4 2 1 Conditions Which Will Automatically Shut Off the TEC Output 4 3 The TEC Connectors 4 3 1 TEC Grounding Consideration 4 4 TEC Module Operation 4 4 1 Quick Start 4 4 2 TEC Main Screen 4 4 3 TEC Setup Screen 4 4 4 Link Conditions 4 5 Sensors 4 5 1 Thermistor and Thermistor Current Selection 4 5 2 AD590 and LM335 4 5 3 RTD Sensors 4 6 TEC Module Theory of Operation 4 6 1 TEC Interface 4 6 2 Limit DAC 4 6 3 Set Point DAC 4 6 4 A D Converter 4 6 5 Sensor Select 4 6 6 Difference Amplifier 4 6 7 Proportional Amplifier and Integrator 4 6 8 Bipolar Output Stage 4 6 9 TEC Control Modes Maintenance 5 1 Introduction 5 2 Fuse Replacement 5 3 Cleaning Calibration 6 1 Calibration Overview 6 1 1 Environmental Conditions 6 1 2 Warm Up 6 2 Laser Calibration 6 2 1 Recommended Equipment 6 2 2 Drive Current Load Resistor Selection 6 2 3 Local Operation Current Source Io Calibration 6 2 4 Remote Operation Current Source Io Calibration 6 2 5 Local Operation Ipp Current Calibration 6 2 6 6 2 7 6 2 8 Remote Operation Ipp Current Calibration Local Operation Laser Voltage Measurement Calibration Remote Operation Laser Voltage Measurement Calibration
101. ommunications the Local soft key will be available Pressing it returns the 8000 to a local state When in local mode this key does not appear on the display The 8000 is placed in remote mode through GPIB or RS232 communication or during the execution of a macro or special function 16 Chapter 2 System Operation Main Meru Modul Config Figure 6 Main Menu 2 4 6 Configure Menu The configure menu provides access to the system configuration save recall linking and calibration screens 2 4 7 System Configure Screen Configure System OnDelay 3 8 sec Brightness 188 Key Rate Slow Inver t Ho Dial Rate Slow Lockout disl Na Dial Tick Ho Lockout pad No Master Expanded Audible beeps Yes Figure 7 Configure System Screen The system configure screen controls basic operation of the 8000 system Brightness varies the backlighting intensity Contrast is used to optimize the viewing angle Chapter 2 System Operation 17 2 4 8 Invert inverts screen to be white on black rather than black on white Lockout dial disables the dial to avoid accidental changes in active data fields when the dial is bumped Lockout pad locks out the data entry portion on the keypad Navigation keys such as up and down MENU and MASTER continue to work Note that both the Lockout dial and Lockout pad settings are temporarily suspended while in the Configure System Scree
102. ontrol mode Modulation input 8500 Series only Fault detection Current and voltage limiting Special Configuration for MOPA Lasers 65xxM modules Installation This section describes the procedures for installing and removing a module from the 8000 NOTE The save recall bin information will be lost upon detecting any change in the module configuration such as installing a new module CAUTION Although ESD electrostatic discharge protection is designed into the module operation in a static fee work area is recommended CAUTION Do not plug in or unplug a module with the AC power on 25 26 Chapter 3 Laser Diode Driver Module Operation To install the module into the 8000 follow these steps 1 Turn the 8000 power off Installing a module with the 8000 on can damage the module and the 8000 2 Place the module into an open bay on the back of the 8000 and slide the module into place There are tracks at the top and bottom of the bay which guide the module into place Screw the module locking screws into the back panel to secure the module To remove the module from the 8000 follow these steps 1 Turn the 8000 power off Removing a module with the 8000 on can damage the module and the 8000 2 Unfasten the module locking screws which secure the module to the 8000 back panel 3 Grasp the module by the handle which extends from the bottom of the back panel Gently but firmly pull the
103. ontroller Module Operation 51 4 4 3 4 2 4 4 3 4 3 4 4 3 4 4 4 4 3 5 4 4 3 5 1 4 4 3 5 2 Constant Resistance Reference Mode Const R Const v Const i This mode operates identically to the Const T mode but the sensor input is not converted to temperature but is displayed in unconverted form Likewise the set point is used directly not converted from temperature Thermistor and RTD sensors use resistance Const R mode RSET and R variables LM335 sensors use millivolts Const v mode vSET and v variables and AD590 sensors use microamps Const i mode iSET and i variables Const R Const v and Const i are primarily intended for users who know a sensor set point in sensor units not in C ITE current is also displayed in these modes Const v and Const i modes are not supported on dual or combination TECs as the sensors required for these modes are not supported Constant Current Mode Const ITE Unlike the modes above the Const ITE mode allows the operator to explicitly set the amount and direction of current flow through the TEC using ISET and ITE variables If a sensor has been selected the TEC temperature will be displayed Although temperature is not a factor in the amount or direction or current flow the high and low temperature limits are observed and will shutdown the output if exceeded in Const ITE mode if a sensor is selected For no temperature
104. peration AD590 Sensor Calibration a With the TEC output off connect a precision 16 kQ metal film resistor and a precision ammeter in series at the sensor input of the TEC Module Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Press the Setup soft key and select the AD590 as the Sensor Type Press the Prev soft key to return to the single display Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC sensor calibration mode by pressing the Sensor soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 3 5 Remote Operation AD590 Sensor Calibration a With the TEC output off connect a precision 16 kQ metal film resistor and a precision ammeter in series at the sensor input of the TEC Module Enter the TEC CHAN command to select the channel suchannel to be calibrated Enter the TEC SEN 4 and TEC CAL SEN to select the AD590 sensor and enter sensor calibration mode The 8000 will be ready to receive the current value when after a TEC CAL SEN query is sent the response from the 8000 is 1 Input
105. porated into every Laser Diode Driver offered Input power module filters provide first stage protection against transients Additional filtering and power regulation stages coupled with high speed transient detection circuits let you operate your laser diode worry free from transients A slow turn on sequence multiple output shorting circuits and an independent current limiting feature provide the superior protection you demand from all your laser diode instrumentation Intuitive Controls and Large Graphics Display Simplify Control and Test Procedures Improved data presentation and system control are achieved using a large graphics display A MASTER display shows the entire system configuration as well as each module s status Soft Keys guide you through initial system setup routines and the operation of each module Real time control of an output is accomplished either by entering the set point on the keypad or via the control knob MENU and FUNC keys access saved system configurations and repetitive procedures All controls are clearly marked and instructions easily understood for simple operation GPIB IEEE 488 2 and RS232 Interfaces Gives Power to Remotely Control and Collect Data For ultimate control a GPIB IEEE 488 2 interface is available All control and measurement functions are accessible via the GPIB interface In addition standard serial RS 232C input and output ports allow several of the mainframes to be connected togethe
106. r Resolution mW 0 01 0 01 0 01 108 Chapter 9 Specifications 9 2 2 1 Combo Module TEC Section Specifications TEC Output Maximum Current Maximum Voltage Typical Power Current Limit Range Accuracy Ripple Noise rms Short Term Stability 1 hour 30 C Long Term Stability 24 hour 30 C Temperature Coefficient C C Measurement Display Range Temperature Resistance 10 uA Resistance 100 uA TE Current Resolution Temperature Resistance 10 uA Resistance 100 uA TE Current Accuracy Temperature Resistance 10 pA Resistance 100 uA TE Current 0 Temperature Sensor Sensor Type Sensor Bias Thermistor Calibration 86xx 8C 2 Amps 4 Volts 8 Watts 0 to 2 Amps 10 mA lt l mA lt 17 ppm lt 33 ppm 0 05 100 00 C to 240 00 C 0 01 KQ to 495 KQ 0 001 KQ to 49 5 KQ 2 Amps 0 01 C 10Q 1Q 1 mA 0 1 C 0 04 16 Q 0 05 8 Q 0 5 2 mA NTC 2 wire Thermistor 10 uA 100 pA 1 T C1 x 10 3 C2 x 10 4 In R C3 x 10 7 In R 19 of reading fixed error 20 Temperature is a value derived from using the thermistor calibration equation Accuracy can be computed by applying the sensor s resistance parameter to the above equation at the temperature in question Chapter 9 Specifications 109 9 3 Display Type Back Lighting Controls Channel Active Output Connectors Temperature Controller TEC
107. r to build large test and characterization stations As your instrumentation needs change the Model 8000 Modular Controller will adapt to all your new laser diode applications giving you the ultimate in flexible laboratory equipment 4 Chapter 1 General Information 1 3 Available Options and Accessories Model 8000 Modular Controller Mainframe Model 8008 Modular Controller Mainframe Model 8000 MOPA Module 8540M 500 mA 4A Laser Diode Driver Module Model 8000 Temperature Controller TEC Module 8325D 2 5A 6V 15W Dual Temperature Controller Module 8350 5A 8V 40W Temperature Controller Module Model 8000 Laser Diode Driver LDD Modules 8505 500 mA Laser Diode Driver Module 8510 1 000 mA Laser Diode Driver Module 8530 3 000 mA Laser Diode Driver Module 8560 6 000 mA Laser Diode Driver Module Model 8000 Dual LDD Modules 8501D 100 mA Dual Laser Diode Driver Module 8505D 500 mA Dual Laser Diode Driver Module 8510D 1 000 mA Dual Laser Diode Driver Module Model 8000 Combination LDD TEC Modules 8605 500 mA LDD amp 2 5A 6V TEC Combination Module 8610 1 000 mA LDD amp 2 5A 6V TEC Combination Module 8630 3 000 mA LDD amp 2 5A 6V TEC Combination Module Model 8008 Dual LDD Modules 8501 8D 100 mA Dual Laser Diode Driver Module 8505 8D 500 mA Dual Laser Diode Driver Module 8510 8D 1 000 mA Dual Laser Diode Driver Module Model 8008 Combination LDD TEC Modules 8601 8C 100 mA LDD amp 2A 4V TEC Combination Module 8605 8C 500 mA
108. ration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration 6 3 7 Remote Operation LM335 Sensor Calibration a With the TEC output off connect a 3 kQ metal film resistor and a precision voltmeter in parallel at the sensor input of the TEC module Enter the TEC CHAN command to select the channel suchannel to be calibrated Enter the TEC SEN 3 and TEC CAL SEN to select the LM335 sensor and enter sensor calibration mode The 8000 will be ready to receive the voltage value when after a TEC CAL SEN query is sent the response from the 8000 is 1 82 Chapter 6 Calibration Input the actual voltage in mV measured by the external voltmeter as an lt nrf value gt via the TEC R lt nrf value gt command If at any time prior to TEC R a command other than TEC R or TEC R is sent to the 8000 the 8000 will cancel the calibration mode and then process the command s Once the TEC R value is sent the OPC query may be used to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger an interrupt This type of interrupt is enabled by setting bit 0 of the Service Request Enable register and using the OPC command 6 3 8 Local Operation RTD Calibration a Measure and record the exact resistance of your 100 Q metal film resistor With the TEC output off con
109. requency between 200 Hz to 300 kHz Below 2 kHz the frequency is displayed in Hz while above 2 kHz the frequency is displayed in kHz Mod Amplitude Modulation amplitude is entered in milliamps The amplitude is the positive and negative amplitude of the sine or square wave around the Io set point The actual Mod Amplitude set point has a resolution of 1 of the full scale output When changing Mod Amplitude Io min and Io max are recalculated using the Io set point and the new modulation amplitude to derive Io min and Io max For example if the set point was 50 mA and the amplitude was 15 mA Io min would be recalculated at 35 and Io max would be recalculated at 65 Changing Io min or Io max was a similar effect on Mod Amplitude and the Io set point but in reverse See section 3 5 4 5 below Mod Type Mod Type selects the type of waveform generated by the modulation circuit square wave or sine wave lo min and lo max To min and Io max can be used in place of the Io set point and Mod Amplitude to set the top and bottom Io levels for the modulation output Because these values are calculated based on the Io set point and Mod Amplitude and not stored they are displayed as a Modulation Calculator Changing either of these values will change the set point and amplitude settings accordingly Link Conditions The Laser module supports the following link conditions Condition Description On Laser output is on Off Laser output is
110. s a Model 700C laser diode mount recessed at least 14 with the minimum aperture necessary to allow beam exit less than 0 125 If industrial loads are switched in or near your laboratory use isolation transformers and or surge suppresser power strip with your laser current source Isolate your laser current driver with a surge suppresser when using a common line with laboratory power supplies soldering irons or other electronic instruments Avoid using such devices on the same surge suppresser as your laser source Make sure the all cables to the laser diode are securely fastened Avoid bundling current source cables with other cables in your laboratory Set current and voltage limits to appropriate levels following the laser manufacturer s recommendations or to just above the expected operating current Suggestions include setting the compliance voltage no more than 10 above Vs and setting the current limit at or below the maximum operating current of the laser diode Avoid ground loops Don t ground the LDD cable shield to the laser diode body Added protection from electrostatic discharge ESD can be obtained by inserting ferrite beads and capacitors near the laser diode as shown below 3 5 uH Ferrite Beads LDD Connector D Sub 9 Mouser P N 542 FB73 287 PD Anode pin7 LD Anode pin 8 9 O LD Cathode pin 4 5 pin 6 PD Cathode EGND pin 3 Figure 13 Laser Diode Protect
111. s or laser hazards and are familiar with safety precautions required to avoid possible injury Read the instruction manual thoroughly before using to become familiar with the instrument s operations and capabilities WARNING The American National Safety Institute ANSI states that a shock hazard exists when probes or sensors are exposed to voltage levels greater then 42 VDC or 42V peak AC Do not exceed 42V between any portion of the Model 8000 or any attached detector or probe and earth ground or a shock hazard will result CAUTION There are no serviceable parts inside the Model 8000 Work performed by persons not authorized by Newport Corporation may void the warranty For instructions on obtaining warranty repair or service please refer to Chapter 7 of this manual 2 1 2 2 2 2 1 CHAPTER 2 System Operation Introduction This chapter describes how to operate the 8000 mainframe Module specific details can be found in the module s manual Installation CAUTION Although ESD protection is designed into the 8000 operation in a static fee work area is recommended CAUTION Do not plug in or unplug a module with the AC power on AC Power Considerations The 8000 can be configured to operate at a nominal line voltage of 100 120 220 or 240 VAC Normally this is done at the factory and need not be changed before operating the instrument However be sure that the volta
112. s will continue to accumulate in the error queue but will not be displayed on screen Rear Panel Familiarization Cc OD O CAUTION QA Newport PROCESSOR TURN POWER OFF BEFORE MODEL NO INSERTING OR REMOVING MODULES SERIAENO o C 250V 3AG SLO BLO ex 5 00 A 100 120V A es 2 50 A 220 240V ic a RS 232 GPIB sm ek 3 00 a RT Max Power A 425 Watts e o 50 60 Hz WARNING FOR CONTINUED PROTECTION AGAINST FIRE RISK 0 5 REPLACE ONLY WITH FUSE OF SPECIFIED TYPE amp RATING Figure 11 Rear Panel GPIB Connector The GPIB connector located on the back of the microprocessor module allows full remote control as described in the Computer Interfacing Manual The connector accepts a standard IEEE 488 cable for remote control and uses Metric lockscrews RS 232 Connector The 8000 has one RS 232 connector located on the back of the microprocessor module for remote control via the serial port See section the Computer Interfacing Manual for a more complete description of the RS 232 interface 22 Chapter 2 System Operation 2 5 3 2 5 4 2 6 2 6 1 Input Power Connector Accepts a standard line cord for AC input Also selects one of four AC input settings 100V 120V 220V and 240V The cord must be removed to change the setting A small screwdriver will open the top of the module and expose the rotary switch Select the ran
113. stem such as laser output OFF ON In the first case pressing the corresponding soft key will cause the action to happen such as changing to the setup screen when the Setup soft key is pressed from a module s main screen In the second case pressing the soft key will change the associated state such as turning a laser output ON Like the editable 12 Chapter 2 System Operation Combo Dual TEC 2 4 2 data fields above certain soft keys are programmed to enter a read only mode when the unit enters remote mode Read only soft keys are displayed as an outline rather than a solid block Non editable Focused editable Soft key Static Field v VS data field a data field W n 282 500 Lon fire ET cee 2 A AAHA 5 7 cens err TSET 2 FI E 2000 f 5 000 Io A am0 ff Tre ABA T error Tset 25 88 C EA A868 T error Tser lt 75 00 C U35 i p ga T 25 00 Tr 75 00 C Non focused editable data field Figure 2 Various Data Fields Found on the Master Screen Function Keys The FUNC button serves two purposes on the 8000 first as a quick navigation method that speeds switching between module screens and second as a method of setting up and executing user defined macros and special functions For macros and special functions the FUNC key is used both to execute and to enter the setup screen on the particular function For example if the 8000 supported a special function 1 to enter the se
114. structions to complete the calibration The calibration can be canceled without affecting the stored constants if the Cancel soft key is pressed at any point prior to completing the calibration Local Operation Ite Current Calibration The following procedure is for calibrating the ITE constant current source for both polarities of current 84 Chapter 6 Calibration With the output off connect a 1 Q 50 W resistor and a calibrated ammeter in series across the laser output terminals If an ammeter with the appropriate current ratings is unavailable connect a 1 Q 50 W resistor across the laser output terminals and use a calibrated DMM to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law I V R where V is the measured voltage across the resistor and R is the measured load resistance For dual and combination modules also connect a 10 kQ resister across the sensor input Go to the single module display by first pressing the MENU button then the Modules soft key then the slot soft key that corresponds to the module to be calibrated Go to the Calibration Screen This is done by pressing the Menu button Config soft key Calibrate soft key then the soft key s that correspond to the module to be calibrated Enter the TEC ITE calibration mode by pushing the ITE soft key Follow the on screen instructions to complete the calibration The calibration can be canceled without a
115. t DAC Set Point DAC Bipolar Output Converter Integral Amp R Sensor Select and Amps PI Loop Figure 29 TEC Board Module Diagram TEC Interface The TEC interface provides optically isolated serial communications between the TEC board and the microprocessor Control signals are passed to the TEC board to set the TEC board status current limit and temperature set points Instructions and data are sent over the serial interface to the optical barrier Status and data are serially passed back to the microprocessor Limit DAC The microprocessor loads the digitally stored current limit value into the current limit 12 bit DAC The Limit DAC converts the digital limit signal from the microprocessor to a voltage which becomes the limit voltage for the Bipolar Output Stage The current limit value is updated at power up at a bin recall and whenever the LIM ITE value is changed Chapter 4 Temperature Controller Module Operation 65 4 6 3 4 6 4 4 6 5 4 6 6 4 6 7 4 6 8 Set Point DAC The microprocessor loads the digitally stored current set point value into the set point 16 bit DAC The Set Point DAC converts a digital set point signal from the microprocessor to a voltage which becomes the set temperature input to the PI control loop The TEC current set point value is updated at power up at a bin recall and whenever a TEC set point value is changed A D Converter The 16
116. t of this stage directly drives the externally connected TE cooler module Voltage Limit Condition Sensing Comparators sense the output to determine when the TEC output compliance voltage limiting is occurring This condition occurs whenever the TEC output is open or connected to a high resistance If this condition occurs the V Limit error signal is passed to the microprocessor TEC Control Modes The 8000 provides three control modes for operation constant T temperature constant R resistance voltage or current and constant ITE current modes Each of these modes is discussed in the following sections T Mode In constant T mode the TEC is driven to the set point temperature This temperature is monitored by the sensor in the TEC In the case of a thermistor sensor the thermistor s resistance is used to determine TEC s temperature by using the Steinhart Hart conversion equation The resistance is determined by measuring the voltage across the thermistor with a known current of 10UA or 100HA The ITE current is also measured and saved The TEC s output current is sensed across a resistor and the voltage is converted to an ITE current value When an LM3335 sensor is used a two point conversion equation is used to determine the temperature Its voltage is measured as well as the ITE current Chapter 4 Temperature Controller Module Operation 67 4 6 9 2 4 6 9 3 When an AD590 sensor is used another two point conversion
117. t program mnemonic gt Lookup word as part of a header path has no commands E 121 lt program mnemonic gt Lookup word as part of a header path is not found E 122 lt program mnemonic gt Lookup cannot find a null entry E 123 lt program mnemonic gt Lookup word within context of current path is not found E 124 lt program mnemonic gt Lookup failed because query command type match failed E 125 lt program mnemonic gt Lookup word within context of common command path is not found E 126 Too few or too many program data elements E 201 lt PROGRAM DATA value out of range E 202 lt PROGRAM DATA gt will not convert to valid type E 203 Security violation command is not available without clearance E 204 lt PROGRAM DATA gt suffix type is not valid E 205 lt PROGRAM DATA gt is not a Boolean value or word E 206 lt PROGRAM DATA gt will not convert to a signed 16 byte value E 207 lt PROGRAM DATA gt will not convert to an unsigned 16 byte value E 208 lt PROGRAM DATA gt will not convert to a signed 32 byte value E 209 lt PROGRAM DATA gt will not convert to an unsigned 32 byte value E 210 lt PROGRAM DATA gt will not convert to a floating point value Chapter 8 Error Messages 95 Error Code E 211 E 212 E 213 E 214 E 216 E 217 E 301 E 302 E 303 E 304 E 305 E 402 E 403 E 404 E 405 E 406 E 407 E 409 E 410 E 411 E 412 E 413 E 415 E 416 E 417 E
118. ter and using the OPC command 7 1 7 2 C HAPTER 7 Factory Service Introduction This section contains information regarding obtaining factory service for the Model 8000 The user should not attempt any maintenance or service of this instrument and or accessories beyond the procedures given in chapters 5 and 6 Any problems which cannot be resolved using the guidelines listed in chapters 5 and 6 should be referred to Newport Corporation factory service personnel Contact Newport Corporation or your Newport representative for assistance Obtaining Service To obtain information concerning factory service contact Newport Corporation or your Newport representative Please have the following information available 1 Instrument model number On front panel 2 Instrument serial number On rear panel 3 Description of the problem If the instrument is to be returned to Newport Corporation you will be given a Return Materials Authorization RMA number which you should reference in your shipping documents as well as clearly marked on the outside of the shipping container Please fill out the service form located on the following page and have the information ready when contacting Newport Corporation Return the completed service form with the instrument 89 Service Form Newport Corporation USA Office 949 863 3144 FAX 949 253 1800 Name RETURN AUTHORIZATION Company Please obtain prior to return of ite
119. ting but at the 10uA setting the resolution is only 0 2 C while at the 100 uA setting the resolution is better than 05 C Generally it is best to use the 100uA setting for all measurements of 10 C or greater with a 10 K thermistor Selecting Thermistors The type of thermistor you choose will depend primarily on the operating temperature range These guidelines for selecting the range and resolution will apply 56 Chapter 4 Temperature Controller Module Operation 4 5 1 6 to any thermistor 10 K thermistors are generally a good choice for most laser diode applications where high stability is required near room temperatures Similarly 10 K thermistors are often a good choice for cooling applications where you want to operate at temperatures from 40 C to room temperature If you require a different temperature range or the accuracy you need can t be achieved with either current setting select another thermistor Thermistor temperature curves supplied by the manufacturer show the resistance verses temperature range for many other thermistors Newport Inc will also offer help for your specific application The Steinhart Hart Equation The Steinhart Hart equation is used to derive temperature from the non linear resistance of an NTC Negative Temperature Coefficient thermistor The following section contains an explanation of the Steinhart Hart equation and the values of these constants for some common thermistors Tw
120. tor for TEC module input Combination LDD TEC Modules 8000 e Internal function generator e 2 5 Amps at 6 Volts 15 Watt highly stable TEC e 200 mA to 2 Amp low noise LDD Dual Laser Diode Driver LDD Module 8000 and 8008 e Two independent outputs per module e 100 to 1 000 mA per channel Combination LDD TEC Modules 8008 1 Chapter 1 General Information e Internal function generator e 2 0 Amps at 4 Volts 8 Watt highly stable TEC e 200 mA to 2 Amp low noise LDD The Model 8000 Modular Controller is a result of Newport s continuing commitment to provide advanced laser diode instrumentation at affordable prices The fully isolated bays are designed to accept a wide variety of modules Advanced designs guarantee that the Model 8000 will accommodate future modules making this controller the most complete instrument for laser diode control characterization and testing far into the future High Power Temperature Controller Fulfills All Your Thermo Electric TE Cooling Needs The 40 Watt Model 8350 Temperature Controller module is offered to meet your most demanding TE cooling needs It may be operated in one of three modes e Constant Temperature e Constant Resistance e Constant TE Current Short term stability is less than 0 004 C while long term stability is better than 0 01 C Four sensor types are compatible with this TEC module e Thermistors e AD590 series e LM335 series e 100Q Platinum RTDs With the sensor
121. tup screen of function 1 press and hold the FUNC key then press the 1 key then release both This would enter the setup screen for function 1 To execute function 1 press and release the FUNC key then press and release the 1 key If functions are not setup supported for a particular key the 8000 will beep Chapter 2 System Operation 13 2 4 3 Menu Structure Master Display Sub Slot 2a Sub Slot 2b Configure Menu Save Recall Communications Local Figure 3 Model 8000 Menu Structure 14 Chapter 2 System Operation 2 4 4 Master Display The Master Display is shown in Figure 4 and Figure 5 This is the highest level display and indicates the general status of up to four modules or submodules in the system at a time The master display has two modes of operation Expanded and Condensed Figure 4 shows the master display as it would be viewed in Expanded mode Each channel is displayed in one fourth of the display When the system has modules with multiple submodules such as the dual TEC or Combo module each submodule is displayed separately and the module ID box on the left shows the slot number with an a b etc after the module number to indicate the submodule When the total number of modules and submodules exceeds four pressing the MASTER key repeatedly pages down though the list of modules inf B A A Bpi Uif GABAL BBS coe Rar 18 000ke O Rec aon lo em GG B22 Ta PONC Figure 4 Master
122. y is with lead wire resistance calibrated out RTD 100Q 0 01 C x 0 05 rE lmA 100 Chapter 9 Specifications 9 1 3 Specifications Laser Output Output Current Range mA Output Current Resolution mA 16 bit Output Current Accuracy Compliance Voltage Temperature Coefficient Full Scale Short Term Stability 1 hr Full Scale Long Term Stability 24 hr Full Scale Noise Ripple rms Hi BW Lo BW Lo BW CW Current Limit Range Resolution Accuracy Analog Modulation Input range Input Impedance Transfer Function Bandwidth 3 dB Hi BW Lo BW Lo BW CW Photodiode Input Monitor Current Temperature Coefficient Full Scale C Range Stability Full Scale 24 hours Accuracy Photodiode Reverse Bias 10 Measurement Display Output Current Range mA Output Current Resolution mA Output Current Accuracy Forward Voltage Range Volts Forward Voltage Resolution mV Forward Voltage Accuracy Photodiode Current Range uA Photodiode Current Resolution uA Photodiode Current Accuracy PD Resp Range uA mW PD Resp Resolution uA mW Optical Power Range mW Optical Power Resolution mW 8505 0 to 500 mA 0 0076 0 03 15 pA 7 Volts lt 50 ppm C lt 10 ppm lt 50 ppm lt 8 0 pA lt 4 0 pA lt 2 0 pA 0 to 500 mA 1 mA 2mA 0 to 10V 10kQ 50 mA V DC to 350 kHz DC to 10 kHz DC to 30 Hz lt 0 02 0 5mA era 0 02 0 00
123. yed temperature Ta 4 Determine the new value of C1 from the formula C1 T Ta and enter the new C1 value 62 Chapter 4 Temperature Controller Module Operation 4 5 2 4 2 Two Point Calibration Method The calibration described in this section is independent of the calibration procedure described in sections 6 3 4 and 6 3 6 Those sections deal with the internal calibration of the 8300 module while the following calibration procedure is for calibrating the external AD590 or LM335 sensor For the most accurate possible results both calibration procedures should be performed The accuracy of this procedure depends on the accuracy of the externally measured temperature It is used to determine the zero offset of the device and the gain slope 1 Allow the 8000 to warm up for at least one hour Select the desired sensor type in the setup menu 2 Set the Cl parameter to zero Set the C2 parameter to 1 3 Place the sensor at an accurately known and stable temperature T Connect the sensor to the 8000 for normal Constant temperature operation Allow the 8000 to stabilize at the known temperature T and read the displayed temperature Ta Record these values 4 Repeat Step 3 for another known temperature T and the corresponding displayed temperature Taz The two known temperatures should at the bounds of the intended operating range For best results make the range between T and T as narrow as possible 5 Determine th

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