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Installing the LCM-39425 Module
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1. 27 Remote Operation ITE Current Calibration 28 ii LCM 39425 BILA Lightwave LIST OF FIGURES Figure 2 1 LCM 39425 Back Panel 7 Figure 2 2 Back Panel LD Connector 8 Figure 2 3 Common Laser Cathode Photodiode Cathode 9 Figure 2 4 Common Laser Cathode Photodiode Anode 9 Figure 2 5 Common Laser Anode Photodiode Cathode 10 Figure 2 6 Common Laser Anode Photodiode Anode 10 Figure 2 7 Back Panel TEC Connector 13 Figure 3 1 lpp Calibration Circuit 19 08_13 LCM 39425 iii iv LCM 39425 BILA Lightwave SAFETY AND WARRANTY INFORMATION E El a a El a a a a GB m B a The Safety and Warranty Information section provides details about cautionary symbols used in the manual safety markings used on the instrument and information about the Warranty including Customer Service contact information Safety Information and the Manual Throughout this manual you will see the words Caution and Warning indicating potentially dangerous or hazardous situations which if not avoided could result in death serious or minor injury or damage to the product Specifically A CAUTION Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment MA warnine Warning indicates a potentially da
2. 7 AQ Mm Users Guide rent Source TE Controller Module LCM 39425 MIA Mchwa A Newport Corporation Brand ILX Lightwave 31950 Frontage Road Bozeman MT U S A 59715 U S 4 Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www newport com ilxlightwave 70020405_01 August 2013 TABLE OF CONTENTS 5 E a B a a El a E EI a a E E Safety Information and the Manual v General Safety Considerations v Safety Symbols rees nha NANA bee eee a a aa Peat ed ea TA ANG vi Safety Marking Symbols vi Wattanty i iccacce cgi dtaiwta UAE AE vii IS IIIA IAA IA bea vii Returning an Instrument vii Claims for Shipping Damage viii Comments Suggestions and Problems ix Chapter 1 Introduction and Specifications Specifications 2 Chapter 2 Installation and Operation Installing the LCM 39425 Module 5 Removing the LCM 39425 Module 6 Operation occse n sdrk Kte Naa DA PEB NADERA En EREA NG PA KG 6 The LASER Connector 8 Connecting to Your Laser 000 cece eee 8 Laser Diode Connections
3. all modules Range 20 2000 pA Output Stability 2 UA Setpoint Accuracy 2 UA External Analog Modulation Input N A Transfer Function N A Bandwidth 3dB N A BILI Lightwave INTRODUCTION AND SPECIFICATIONS CHAPTER 1 Specifications _ Drive Current Measurement Display Output Current Range 0 500 00 mA Output Current Resolution 0 01 mA Output Current Accuracy 0 5 mA Photodiode Current Range 0 2000 pA PD Current Resolution 1 uA PD Responsivity Range 0 00 1000 00 pA mW PD Responsivity Resolution 0 01 pA mw Optical Power Range 0 00 200 00 mW Optical Power Resolution 10 uw Voltage Range N A Voltage Accuracy N A Temperature Control Output Temperature Control Range 99 9 C to 99 9 C Thermistor Setpoint Resolution 20 C to 20 C 0 1 C Accuracy 20 C to 20 C 0 2 C Resolution 20 C to 50 C 0 2 C Accuracy 20 C to 50 C 0 2 C Short Term Stability 1 hour 13 lt 0 05 C Long Term Stability 24 hours lt 0 1 C Output Type Bipolar constant current source all modules Compliance Voltage gt 6V DC Short Circuit Output Current 2A Maximum Output Power 12W Current Noise and Ribble lt 1 MA rms Current Limit Range 0 2A Current Limit Set Accuracy 0 05 A Control Algorithm Smart Integrator Hybrid PI all modules Temperature Sensor Types Thermistor 2 wire NTC The
4. 5A 225W 50 60 Hz Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree 2 Installation overvoltage Category II for transient overvoltages Maximum Relative Humidity lt 80 RH non condensing Operating temperature range of 10 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation Safety Marking Symbols This section provides a description of the safety marking symbols that appear on the instrument These symbols provide information about potentially dangerous situations which can result in death injury or damage to the instrument and other On In position of a bistable push control Off Out position of a bistable push control components Caution Earth Alternating Visible and or refer to ground current invisible laser AA manual Terminal INI radiation Caution risk Protective Caution hot Frame or of electric Conductor surface chassis A shock Terminal A Terminal or I The slash 1 only denotes that mains are on odl 0 The circle O only denotes that mains are off vi of Safety and Warranty Information BILI Lightwave SAFETY AND WARRANTY INFORMATION Warranty WARRANTY ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and workmanship for a period of one year from date o
5. If the OPC query is issued during ITE calibration the time out period of the GPIB driver should be at least 1 minute to prevent the GPIB driver from timing out and hanging the system Refer to your GPIB driver instruction manual for information on setting the GPIB driver time out period The operation complete flag bit O of the Standard Event Status Register may be used to trigger a service request This type of interrupt is enabled by setting bit 0 of the Service Request Enable register via the ESE command and bit 5 of the Service Request Enable register via the SRE command Service request SRQ handling depends on your GPIB hardware Refer to your GPIB user s manual for details 08 13 LCM 39425 29 CALIBRATION TEC Calibration Procedures 30 LCM 39425 BILI Lightwave
6. LDC 3900 Installing the LCM 39425 Module To install the LCM 39425 module into the LDC 3900 follow these steps 1 Turn the LDC 3900 power off 2 Place the LCM 39425 module into an open bay on the back of the LDC 3900 and slide the module into place There are tracks at the top and bottom of the bay which guide the module into place Push the module into place until the board edge clicks into place with an audible pop This indicates that the module is locked into place Fasten module to the mainframe with the Module Locking Screws see Figure 2 1 to secure the module lt is then ready to be used in the LDC 3900 3 Power up the LDC 3900 4 After the LDC 3900 has completed its power up sequence the ADJUST LAS and TEC indicators which correspond to the newly installed LCM 39425 module should be lit in green indicating that the module has been recognized as a LASER controller in its respective bay ii ILX Lightwave LCM 39425 5 m INSTALLATION AND OPERATION _ Removing the LCM 39425 Module Removing the LCM 39425 Module To remove the LCM 39425 module from the LDC 3900 follow these steps 1 Turn the LDC 3900 power off 2 Unfasten the Module Locking Screws see Figure 2 1 on the LCM 39425 module back panel 3 Grasp the LCM 39425 module by the handle which extends from the bottom of the back panel Gently but firmly pull the module out of the LDC 3900 4 If the LCM 39425 module is replaced in the LDC 3900 before the
7. LDC 3900 is powered up again the LDC 3900 will retain its memory of all parameter settings and SAVE RECALL values However if the LDC 3900 is powered up and detects a change in its system configuration all parameters and SAVE RECALL information will be lost Calibration data is stored in the LCM 39425 module itself and is never lost due to reconfiguration of the LDC 3900 Operation This section describes the procedures for connecting and running a laser diode with the LCM 39425 module Refer to Chapter 2 of the LDC 3900 Instruction Manual for front panel description and operation Refer to Figure 2 1 for the following discussion of connections to the LCM 39425 Note The LCM 39425 module only operates from the front panel with both the TEC and LASER outputs turned on or off together If you wish to run the LCM 39425 current source with no temperature control the TEC output must be shorted or a dummy load connected to pins 1 2 and 3 4 of the TEC connector Also a sensor load resistor i e 10K Ohms must be connected between pins 7 and 8 If you wish to run the LCM 39425 TEC controller with no laser current output the LAS interlock pins 1 and 2 must be shorted Also the LAS output pins 4 5 and 8 9 must be shorted With LDC 3900 v3 1 and higher the LAS and TEC outputs may be controlled independently using the LAS ONLY OUT and TEC ONLY OUT commands 6 LCM 39425 BILA Lightwave INSTALLATION AND OPERATION Operation Mod
8. Modular Laser Diode Controller be sure that the front panel OUTPUT LED is unlit output off Before turning on the LASER output be sure that the current limit has been correctly set The following figures show the possible configurations of connecting laser diodes and photodiodes with the LDC 3900 Modular Laser Diode Controller 8 LCM 39425 BILA Lightwave Optional Bias INSTALLATION AND OPERATION Connecting to Your Laser SHARI 2 3900 Modular Laser Diode Controller OUTPUT Earth Ground Figure 2 3 Common Laser Cathode Photodiode Cathode Optional Bias 08 13 P D L D y Ji LZ Figure 2 4 Common Laser Cathode Photodiode Anode 3900 Modular Laser Diode Controller OUTPUT Earth Ground LCM 39425 9 KI Ba 2 INSTALLATION AND OPERATION CHAPTER Connecting to Your Laser 3900 Modular Laser Diode Controller Optional Bias OUTPUT a mr l A Earth Ground am Figure 2 5 Common Laser Anode Photodiode Cathode 3900 Modular Laser Diode Controller OUTPUT Optional Bias Earth Ground Figure 2 6 Common Laser Anode Photodiode Anode 10 LCM 39425 BILI Lightwave INSTALLATION AND OPERATION Photodiode Feedback Connections A CAUTION The cable connections to the laser must be secure enough that they won t open circuit should they be jostled or bumped Should an ope
9. calibration value into non volatile memory It will then expect the second calibration current approximately one fourth of the original current 7 The LDC 3900 will beep when it is ready to accept the second calibration value When it does press and hold in the PARAMETER SET switch and turn the ADJUST knob until the LASER display indicates the same current as measured directly or as calculated in Step 1 from the measured voltage 8 Release the PARAMETER SET switch to accept the second calibration point After the PARAMETER SET switch is released the LDC 3900 will calculate the calibration constants store them to nonvolatile memory on the LCM 39425 beep and return to its former before calibration state 20 LCM 39425 iWILX Lightwave CALIBRATION Laser Controller Calibration Procedures Remote Operation lpp Current Calibration The following procedure is for calibrating the LASER Ipp constant current source over GPIB This procedure calibrates the feedback circuits for constant Ipp and constant Ppp modes When these values are reached and are stable the user enters the actual value of the current as measured by an external DMM The LCM 39425 then automatically calibrates the LASER feedback circuits This procedure is for remote GPIB operation 1 With the LASER output off connect a calibrated ammeter to the PD Anode output of the LCM 39425 and connect the circuit of Figure 3 1 to the LASER and PD outputs If
10. lpp value when after a LAS CAL MDI query is sent the response from the LDC 3900 is 1 6 Once the actual value is entered via the LAS MDI command the LDC 3900 will beep and the new calibration value will be stored into non volatile memory It will then set the current to approximately one fourth of the original current and expect the second calibration value to be entered The LDC 3900 will be ready to receive the second lpp value when after a LAS CAL MDI query is sent the response from the LDC 3900 is ma N Input the second actual measured lpp current as an lt nrf values as in Step 5 08 13 LCM 39425 21 CALIBRATION Laser Controller Calibration Procedures 8 Once the second actual monitor diode current value is entered via the LAS MDI command the LDC 3900 will beep and the new calibration constants will be calculated and stored into non volatile memory in the LCM 3900 The OPC query may be used after the LAS MDI value is sent to determine when the calibration is completed The operation complete flag bit O of the Standard Event Status Register may be used to trigger a service request This type of interrupt is enabled by setting bit 0 of the Service Request Enable register via the ESE command and bit 5 of the Service Request Enable register via the SRE command Service request SRQ handling depends on your GPIB hardware Refer to your GPIB user s manual for details 22 LCM 39425 iWILX Light
11. resistor to the thermistor input of the LCM 39425 TE connector pins 7 and 8 see Figure 2 1 Enter the TEC sensor calibration mode by pushing the GPIB LOCAL and TEC DISPLAY R switches at the same time The TEC display will become blank for 2 seconds then the sensor code SENSOR SELECT switch position value will be displayed for 2 seconds After this the TEC display will indicate sensor resistance in KQ The LDC 3900 will beep when it is ready to accept a new calibration value Press and hold in the PARAMETER SET switch and turn the ADJUST knob until the TEC display indicates the same resistance you recorded for the metal film resistor Release the PARAMETER SET switch to store the new value into non volatile memory on the LCM 39425 After the PARAMETER SET switch is released the LDC 3900 will beep and return to its former state before calibration Switch the THERM RANGE switch back panel of the LCM 39425 to the 10 pA position and repeat this procedure with the other resistor LCM 39425 25 26 LCM 39425 CALIBRATION TEC Calibration Procedures Remote Operation Thermistor Calibration The following procedure is for calibrating the 100 pA and 10 uA thermistor constant current sources so that the thermistor resistances for these ranges will be as accurate as possible Use nominal values of 10 KA for the 100 pA setting and 100 Kg for the 10 pA setting This procedure is for remote GPIB operation 1 Set the TH
12. AMETER SET switch and turn the ADJUST knob until the LASER display indicates the same current as measured via the DMM 7 Release the PARAMETER SET switch to accept the second calibration value After the PARAMETER SET switch is released the LDC 3900 will perform a limit calibration then calculate the calibration constants store them to nonvolatile memory on the LCM 39425 beep and return to its former before calibration state after about 15 seconds LCM 39425 17 A CALIBRATION Laser Controller Calibration Procedures Remote Operation Current Source Calibration The following procedure is for remote GPIB operation 1 Select the LCM 39425 to be calibrated by sending the LAS CHAN x command where x is the channel of the LCM 39425 Set the LASER limit to 90 of full scale via the LAS LIM I 180 command and current set point to 80 of full scale via the LAS LDI 160 command Connect a calibrated DMM to measure the current across the laser output pins 5 and 8 2 Tum the LASER ENABLE ON switch Enter the LAS OUT ON command to turn the LASER output on If the LASER output is not on the LASER calibration mode cannot be entered The TEC output will also be on 3 Enter the LASER calibration mode by issuing the LAS CAL LDI command The LDC 3900 will beep when it is ready to accept the first calibration point 4 Input the first actual measured LASER output current as an lt nrf values via the LAS LDI lt
13. ERM RANGE switch on the back panel of the LCM 39425 to the 100 pA position Measure and record the exact resistance of your metal film resistors A 4 point probe resistance measurement is recommended These resistors are very temperature sensitive calibration can be impacted by the warmth of your fingers while holding the resistor Attempt to measure the resistors and calibrate the instrument at the same temperature Connect the correct metal film resistor to the LCM 39425 thermistor input pins 7 and 8 see Figure 2 1 Use nominal values of 10 KQ for the 100 uA setting and 100 KA for the 10 pA setting Enter the TEC CHAN x command over the GPIB to select the channel of the LCM 39425 to be calibrated where x the channel number Enter the TEC CAL SENsor command The TEC display will show the resistance value The LDC 3900 will beep when it is ready to accept a new calibration value If this value is to be measured and entered remotely via a GPIB controlled DMM for example the measured value of the resistance should not be entered until the LDC 3900 is ready to receive it The LDC 3900 will be ready to receive the resistance value when after a TEC CAL SEN query is sent the response from the LDC 3900 is 1 Input the actual resistance in KQ measured by the external DMM as an lt nrf values via the TEC R lt nrf value gt command After the TEC R value is entered the OPC query may be used to determine when th
14. On the web at www newport com ilxlightwave Or mail to ILX Lightwave 31950 Frontage Road Bozeman Montana U S A 59715 www newport com ilxlightwave When you contact us please have the following information Model Number Serial Number End user Name Company Phone Fax Description of what is connected to the ILX Lightwave instrument Description of the problem If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service are responsible for any shipping damage when returning the instrument to ILX Lightwave ILX recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides Version 1 Safety and Warranty Information ix SAFETY AND WARRANTY INFORMATION Warranty x Safety and Warranty Information WLX Lightwave CHAPTER 1 INTRODUCTION AND SPECIFICATIONS B B Bs B a a a El El B 5 E a E El A CAUTION The LCM 39425 module requires LDC 3900 firmware version 2 5 or greater Usage with previous versions of firmware may produce unpredictable results The LCM 39425 Current Source TE Controller Module is a precision laser controller current source and temperature co
15. a calibrated ammeter with 0 1 pA resolution is not available place a calibrated DMM with 0 1 mV resolution to measure the voltage across the resistor R1 as shown in Figure 3 1 Calculate the current in the following steps by using Ohm s Law ISE R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance A 4 point probe resistance measurement is recommended 2 Select the LCM 39425 to be calibrated by sending the LAS CHAN x command where x is the channel of the LCM 39425 Set the LASER current limit via the LAS LIM 1 500 command Set the lpp set point to 1600 pA via the LAS MDI 1600 command Set the CAL PD parameter to zero via the LAS CALMD 0 command This puts the LCM 39425 into a constant lpp MDI mode 3 Tum the LASER ENABLE ON switch Enter the LAS OUT ON command to turn the LASER output on The TEC output will also be on If the LASER output is not on the LASER lpp calibration mode cannot be entered 4 Enter the LAS CAL MDI command to place the LCM 39425 in its LASER lpp Calibration mode 5 After a few seconds the LDC 3900 will be ready Enter the first actual lpp current value as an lt nrf values via the LAS MDI lt nrf values command The measured value of the current should not be entered until the LDC 3900 is ready to receive it The LDC 3900 will beep when it is ready to accept a new calibration value The LDC 3900 will be ready to receive the
16. and Shielding cee euee 8 Photodiode Feedback Connections cee eee 11 Grounding Considerations 12 SENSOR SELECT Switches 12 08_13 LCM 39425 i CO O a The TEC Connector 0 000 c ete 13 TEC Grounding Considerations 13 TEC Interlock epus sas bea eee ae bY Ra ee a oes 13 Booster Operation 14 Chapter 3 Calibration Recommended Equipment 16 Environmental Conditions 16 Wari Upang Nan Lee a meee KAWANG Na ha GN LAP 16 Laser Controller Calibration Procedures 17 Local Operation Current Source Calibration eee 17 Remote Operation Current Source Calibration 18 Local Operation IPD Current Calibration 20 0 00 eee eee 19 Remote Operation lpp Current Calibration 21 Local Operation Laser Voltage Measurement Calibration 23 Remote Operation Laser Voltage Measurement Calibration 24 TEC Calibration Procedures 25 Local Operation Thermistor Calibration 25 Remote Operation Thermistor Calibration 26 Local Operation ITE Current Calibration
17. and is stable the user enters the actual value of the current as measured by an external DMM The LDC 3900 then automatically calibrates the TEC current source and limits This procedure is for local front panel operation 1 With the output off connect a 1Q 10 W resistor across the TEC output terminals on the TE OUTPUT connector see Figure 2 1 and use a calibrated DMM to measure the voltage across the resistor Calculate the current in the following steps by using Ohm s Law ISE R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance A 4 point probe resistance measurement is recommended Select the LCM 39425 for calibration by pressing the appropriate ADJUST LAS TEC switch so that the TEC indicator is orange If the TEC output is not off the TEC current calibration mode cannot be entered 2 Press the GPIB LOCAL and TEC DISPLAY ITE switches at the same time to place the LCM 39425 in its TEC Current Calibration mode The OUTPUT must be off to enter the TEC calibration mode The LDC 3900 will automatically turn the LCM 39425 OUTPUT on during calibration when it is required The TEC display will show a value of about zero amps as the LCM 39425 calibrates itself for a zero current level After about 20 seconds the LDC 3900 will beep and the TEC display will begin to change to show about 1 amp for calibration 3 After the value on the TEC display is stable has no
18. calibrate the current limit 1 Select the LCM 39425 to be calibrated by pressing the appropriate ADJUST LAS TEC switch until the LAS indicator is orange Set the LASER current limit LIM to 180 mA 90 of full scale and current set point to 160 mA 80 of full scale Connect a calibrated DMM to measure the current across the output pins 5 and 8 No calibration resistor is required 2 Turn the LASER ENABLE ON switch and press the appropriate OUTPUT ON switch to turn the LASER output on If the LASER output is not on the LASER calibration mode cannot be entered If the LASER output is on but the LASER channel is not selected see Step 1 calibration will be performed improperly 3 Enter the LASER calibration mode by pushing the GPIB LOCAL and LASER DISPLAY switches at the same time The LASER display will indicate output current in mA The LDC 3900 will beep when it is ready to accept a new calibration value 4 Press and hold in the PARAMETER SET switch and turn the ADJUST knob until the LASER display indicates the same current as measured via the DMM 5 Release the PARAMETER SET switch to accept the first calibration value After the LASER DISPLAY SET switch is released the LDC 3900 will beep It will then apply the second calibration current approximately one fourth of the original current 6 The LDC 3900 will beep when it is ready to accept the second calibration value When it does press and hold in the PAR
19. e allowed to warm up for at least 1 hour before calibration Note For all calibration procedures except thermistor calibration a proper load must be present on both the LASER and TEC output connectors This is because both outputs are always turned on and off together Calibration procedures may be aborted with no ill effect by powering off the LDC 3900 before the last value is entered for any calibration procedure 16 LCM 39425 BILI Lightwave 08 13 CALIBRATION Laser Controller Calibration Procedures Laser Controller Calibration Procedures There are three calibration procedures that need to be made for the LCM 39425 They are calibration of the constant current source calibration of the laser voltage measurement and calibration of the constant light power Ipp feedback circuits The LCM 39425 implements a two point calibration for the laser current source Two currents are applied to a load and the resulting measured currents are fed back by the user to the LCM 39425 The LCM 39425 calibration program uses the two data points to calculate calibration constants that it will thereafter use to set current If you have the optional Model 1231 IEEE 488 2 GPIB interface you may follow the procedures in this chapter to calibrate the LCM 39425 remotely Local Operation Current Source Calibration The following procedure is for local front panel operation At the end of this procedure the instrument will automatically
20. e calibration sequence is done However the OPC or WAI command or OPC query should not be issued until after the expected TEC R value is entered or the system will hang This happens because the LDC 3900 will wait indefinitely for an input yet not allow any input until the calibration is finished Once the TEC R value is sent the LDC 3900 will beep and return to its former state before calibration The OPC query may be used after the TEC R value is sent to determine when the calibration is completed The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger a service request This type of interrupt is enabled by setting bit 0 of the Service Request Enable register via the ESE command and bit 5 of the Service Request Enable register via the SRE command Service request SRQ handling depends on your GPIB hardware Refer to your GPIB user s manual for details Switch the THERM RANGE switch back panel to the 10 uA position and repeat this procedure with the other resistor BILI Lightwave CALIBRATION TEC Calibration Procedures Local Operation ITE Current Calibration The following procedure is for calibrating the ITE constant current source for both polarities of current This procedure calibrates the zero current set point automatically then it automatically drives the TE current output to internally set limits of 1 amp When each of these values is reached
21. e or cathode The previous figures show the recommended connections and shielding for the various configurations of laser diode modules and photodiode feedback schemes The photodiode and laser inputs on the LCM 39425 are electrically isolated from ground and each other So if a 4 pin connection is made no common connections no additional jumpers are required The previous figures show the recommended connections and shielding for 3 pin lasers where the common connection is internal to the device A 4 pin laser should be connected with the same shielding as shown in Figure 2 2 but the common connection between the photodiode and the laser is optional 08_13 LCM 39425 11 pj INSTALLATION AND OPERATION Grounding Considerations Grounding Considerations The LASER outputs of the LCM 39425 are isolated from chassis ground allowing either output terminal to be grounded at the user s option Figure 2 3 shows the proper earth ground shielding for laser diode photodiode connections SENSOR SELECT Switches The THERM RANGE switch is used to select the thermistor source current level Table 2 1 shows the THERM RANGE positions and corresponding position code When the THERM RANGE switch is changed during TEC mode operation the new sensor position code will be indicated on the TEC display for three seconds Table 2 1 SENSOR SELECT Switch Positions Switch Position Code 100 pA 01 10 pA 02 The 10 uA and 100 uA designations are
22. ered until the LDC 3900 is ready to receive it The LDC 3900 will be ready to receive the voltage value when after a LAS CAL LDV query is sent the response from the LDC 3900 is 1 6 Once the actual voltage value is entered via the LAS LDV command the LDC 3900 will beep It will then expect the second calibration voltage point approximately one fourth of the original voltage The LDC 3900 will be ready to receive the second voltage value when after a LAS CAL LDV query is sent the response from the LDC 3900 is 1 7 Input the second actual measured LASER voltage as an lt nrf values as in Step 5 8 Once the second actual voltage value is entered via the LAS LDV command the LDC 3900 will beep and the new calibration constants will be calculated and stored into non volatile memory on the LCM 39425 The operation complete flag bit O of the Standard Event Status Register may be used to trigger a service request This type of interrupt is enabled by setting bit 0 of the Service Request Enable register via the ESE command and bit 5 of the Service Request Enable register via the SRE command Service request SRQ handling depends on your GPIB hardware Refer to your GPIB user s manual for details Note For all calibration procedures except thermistor calibration a proper load must be present on both the LASER and TEC output connectors This is because both outputs are always turned on and off together Calibrati
23. f shipment During the warranty period ILX will repair or replace the unit at our option without charge Limitations This warranty does not apply to fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please contact ILX Lightwave Corporation with the instrument s serial number and thoroughly describe the nature of the problem Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service be sure to 1 Obtain a Return Authorization number RA from ILX Customer Service 2 Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from the rear panel of the instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing container with at least 3 inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty 5 Secure the packing box with fiber reinforced strapping tape or metal bands 6 Send the instrument transportat
24. for the thermistor current level thermistor sensor type is implied When using a thermistor the thermistor supply current depends on the thermistor operating temperature range and the required temperature resolution 12 LCM 39425 ImiLxX Lightwave INSTALLATION AND OPERATION The TEC Connector The TEC Connector On the LCM 39425 back panel you will find the 15 pin D connector for the TEC MODULE This connector is used for the input and output connections as shown by the pin out diagram of Figure 2 7 1 2 TE Module 4 3 4 TE Module 5 TE Module Shield 6 Sensor Shield T Sensor 8 Sensor 9 Analog Ground 10 Control Signal 11 Voltage Limit 12 Current Limit 13 Temp Limit 14 Booster Present 15 Digital Ground Figure 2 7 Back Panel TEC Connector TEC Grounding Considerations DO NOT allow Sensor to connect to TEC Module or TEC Module directly or through a common ground Even a momentary connection when the output is off will cause damage to the instrument and or device For the TEC connector if any one terminal pin is grounded then no other terminal pin should be grounded Instrument damage caused by shorting these pins is not covered under warranty TEC Interlock On the back panel TEC connector pins 13 TEMP LIMIT and 15 DIGITAL GND form a type of interlock These two pins are normally not connected open circuit and must remain open for the TEC output to be on If there is a
25. inute period Constant power mode stability specification assumes zero drift in detector responsivity 9 Output current rated into a 102 load 10 Measured at 25 C 11 Software limits of range 12 Accuracy figures quoted for a 10kQ thermistor Accuracy figures are relative to calibration standard Both resolution and accuracy are dependent on the user defined configuration of the instrument 13 Over any one hour period at 25 C Short term temperature stability is a strong function of the thermal environment of the thermistor and TE module Room air currents in particular can easily cause fluctuations of 0 1 C in an exposed mounting configuration 14 Over any 24 hour period at 25 C m ma Ba DN on In keeping with our commitment to continuing improvement ILX Lightwave reserves the right to change specifications without notice and without liability for such changes 4 LCM 39425 BILA Lightwave CHAPTER INSTALLATION AND OPERATION 5 B a a Bi a a El El E a EJ E z EH E This section describes the procedures for installing and removing a LCM 39425 module from the LDC 3900 Note The LDC 3900 will power up in a default state upon detecting any change in the LDC 3900 system configuration such as installing a new module All parameters and SAVE RECALL settings will be set to default values based on the new configuration Calibration data is stored in the LCM 39425 module itself and is never lost due to reconfiguration of the
26. ion pre paid to ILX Lightwave Clearly write the return authorization number on the outside of the box and on the shipping paperwork ILX Lightwave recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the remainder of the original warranty or for 90 days whichever is greater Version 1 Safety and Warranty Information vii SAFETY AND WARRANTY INFORMATION Warranty Claims for Shipping Damage When you receive the instrument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier The factory will supply you with a quotation for estimated costs of repair You must negotiate and settle with the carrier for the amount of damage viii Safety and Warranty Information NING HILIK Lightwave SAFETY AND WARRANTY INFORMATION Warranty Comments Suggestions and Problems To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support You may contact us in whatever way is most convenient Phone suma mak nakaambang 800 459 9459 or 406 586 1244 FAX cree a ABAD AI a daa PAANAN 406 586 9405
27. n circuit occur during laser operation the LASER output will be turned off OUTPUT LED unlit automatically Experience indicates that should an open circuit occur during laser operation while the LASER is ON the laser may be damaged by a momentary circuit break and remake before the final circuit break Although the LCM 39425 provides a proprietary debounce protection circuit for the LASER output secure cabling is important It is recommended that the connections to the LCM 39425 output be made using twisted wire pairs with an earth grounded shield see Figures 2 3 2 6 The output terminals of the unit are 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 induce spurious currents in the photodiode feedback circuit and output leads Photodiode Feedback Connections The connector on the back panel of the LCM 39425 contains the current supply output The photodiode signal is input at the connector at pins 6 and 7 The LCM 39425 photodiode input is zero biased Many laser diode modules contain an internal photodiode that monitors the back facet emission of the laser Usually this photodiode is internally connected to either the laser anod
28. ngerous situation which can result in serious injury or death General Safety Considerations If any of the following conditions exist or are even suspected do not use the instrument until safe operation can be verified by trained service personnel Visible damage e Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the instrument to ILX Lightwave or authorized local ILX Lightwave distributor for service or repair to ensure that safety features are maintained see the contact information on page ix All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation See Returning an Instrument on page vii for more information Hit HILIK Lightwave Safety and Warranty Information v SAFETY AND WARRANTY INFORMATION Safety Symbols SAFETY SYMBOLS This section describes the safety symbols and classifications Technical specifications including electrical ratings and weight are included within the manual See the Table of Contents to locate the specifications and other product information The following classifications are standard across all ILX Lightwave products Indoor use only Ordinary Protection This product is NOT protected against the harmful ingress of moisture Class Equipment grounded type Electrical Rating 100 240 V 2
29. nrf value gt command If this value is to be measured and entered remotely via a GPIB controlled DMM for example the measured value of the current should not be entered until the LDC 3900 is ready to receive it The LDC 3900 will be ready to receive the current value when after a LAS CAL LDI query is sent the response from the LDC 3900 is 1 This query should be issued every 1 3 seconds The instrument should be ready for calibration in about 1 2 seconds 5 Once the actual value is entered via the LAS LDI command the LDC 3900 will beep and will apply a new current equal to approximately one fourth 1 4 the previous set current The LDC 3900 will be ready to receive the second current value when after a LAS CAL LDI query is sent the response from the LDC 3900 is 1 6 Input the second actual measured LASER output current as an lt nrf values as in Step 4 7 Once the second actual value is entered via the LAS LDI command the LDC 3900 will beep a limit calibration will be performed and then the new calibration constants will be calculated and stored into non volatile memory on the LCM 39425 The OPC query may be used after the LAS LDI value is sent to determine when the calibration is completed This will take about 15 seconds to complete The operation complete flag bit 0 of the Standard Event Status Register may be used to trigger a service request This type of interrupt is enabled by setting bit 0
30. nt source and limits This procedure is for remote GPIB operation 1 With the output off connect a 1 Q 10 W resistor across the TEC 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 ISE R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance A 4 point probe resistance measurement is recommended 2 Enter the TEC CHAN x command over the GPIB to select the channel of the LCM 39425 to be calibrated where x the channel number Enter the TEC OUTPUT OFF command to force the output off Enter the TEC CAL ITE command over the GPIB to place the LCM 39425 in its TEC Current Calibration mode The LDC 3900 will automatically calibrate its zero output current and beep when it is ready to continue If the TEC output is not off the TEC current calibration mode cannot be entered The LCM 39425 will first perform a zero point calibration This takes about 20 seconds Then it will set the output to 1 Amp for calibration 3 When the LDC 3900 is ready for the actual TEC current value to be entered a remote query of TEC CAL ITE will return a response of 1 When the measured value actual ITE is stable and the LDC 3900 is ready to proceed enter the value by issuing the TEC ITE lt nrf value gt command where the absolute value of the actual ITE measurement is the lt nrf val
31. ntroller module for use in the LDC 3900 Modular Laser Diode Controller It may be installed in any of the four bays at the rear of the LDC 3900 and may readily be interchanged with any other LDC 3900 module Features of the LCM 39425 include e Service free modularity calibration information is stored on the LCM 39425 e Closed case calibration e High stability low noise design e Flexible setup with LDC 3900 Save Recall front panel functions Photodiode feedback control mode MILIA Lightwave LCM 39425 1 2 CHAPTER 1 INTRODUCTION AND SPECIFICATIONS Specifications Specifications LCM 39425 Isolation Each module is isolated from other modules and earth ground TEC and current source independently isolated Output Connectors Current Source Ouiput 9 pin D sub Photodiode Input 15 pin D sub Drive Current Output Output Current Range 0 500 mA Setpoint Resolution 10 uA Setpoint Accuracy 0 05 of FS Compliance Voltage 6V Temperature Coefficient 100 ppm C Short Term Stability one hour 25 ppm Long Term Stability 24 hours 50 ppm Noise and Ripple uA rms Unfiltered lt 4 pA With Model 320 Filter lt 1 5 pA Transients Operational lt 1 mA 1kV EFT lt 4mA Surge lt 7 mA Drive Current Limit Settings Range 0 500 mA Accuracy 5 mA Photodiode Feedback Type Current input differential zero bias
32. of the Service Request Enable register via the ESE command and bit 5 of the Service Request Enable register via the SRE command Service request SRQ handling depends on your GPIB hardware Refer to your GPIB user s manual for details 18 LCM 39425 BILI Lightwave CALIBRATION Laser Controller Calibration Procedures Local Operation IPD Current Calibration The following procedure is for calibrating the LASER Ipp constant current source This procedure calibrates the feedback circuits for constant lpp and constant Ppp modes When these values are reached and are stable the user enters the actual value of the current as measured by an external DMM The LCM 39425 then automatically calibrates the LASER feedback circuits This procedure is for local front panel operation 1 Select the LCM 39425 to be calibrated by pressing the appropriate ADJUST switch until the LAS indicator is orange With the LASER output off connect a calibrated ammeter to the PD Anode output of the LCM 39425 and connect the circuit of Figure 3 1 to the LASER and PD outputs If a calibrated ammeter with 0 1 pA resolution is not available place a calibrated DMM with 0 1 mV resolution to measure the voltage across the resistor R1 as shown in Figure 3 1 Calculate the current in the following steps by using Ohm s Law ISE R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance A 4
33. on procedures may be aborted with no ill effect by powering off the LDC 3900 before the last value is entered for any calibration procedure 24 LCM 39425 BILI Lightwave CALIBRATION TEC Calibration Procedures TEC Calibration Procedures There are two calibration procedures reguired for the TEC section of the LCM 39425 They are calibration of the resistance at the 10 microamp and the 100 microamp thermistor source current settings and calibration of the ITE current and limits Local Operation Thermistor Calibration The following procedure is for calibrating the 100 pA and 10 uA thermistor constant current sources so that the thermistor resistances for these ranges will be as accurate as possible Use nominal values of 10 KA for the 100 pA setting and 100 Kg for the 10 uA setting This procedure is for local front panel operation 1 08 13 Set the THERM RANGE switch on the back panel of the LCM 39425 to the 100 pA position Select the LCM 39425 for calibration by pressing the appropriate ADJUST LAS TEC switch so that the TEC indicator is orange Measure and record the exact resistance of your metal film resistors A 4 point probe resistance measurement is recommended These resistors are very temperature sensitive calibration can be impacted by the warmth of your fingers while holding the resistor Attempt to measure the resistors and calibrate the instrument at the same temperature Connect the correct metal film
34. pin 9 of the back panel TEC connector When the BOOSTER PRESENT signal is connected to DIGITAL GROUND the LIM value may be increased above the normal operation maximum of 2 0 Amps to a maximum of 10 0 Amps This is permitted for operation with a booster current source so that the CONTROL SIGNAL voltage may be 410 0 volts The CONTROL SIGNAL voltage is linearly proportional to the control current which is limited by the LIM parameter Whether or not a booster current source is used the LCM 39425 uses a sensor for controlling the temperature The feedback loop GAIN may require adjustment when a booster current source is used This is because a booster current source may be used with different thermal loads than those found with normal LCM 39425 operation and those loads may require larger or smaller GAIN values in order to settle to the set temperatures in a desirable fashion See the LDC 3900 Instruction Manual for setting the GAIN value During operation if the status of the connection between the BOOSTER PRESENT and DIGITAL GROUND changes this event will be reported in the TEC Event Status Register When the GPIB option is implemented this event may be used to trigger a service request BILI Lightwave CHAPTER 3 CALIBRATION 8 B a a Bi a a E m a BI a z EH El The LCM 39425 should be calibrated every 12 months or whenever performance verification indicates that calibration is necessary All calibrations can be done wi
35. point probe resistance measurement is recommended Interlock 1 Interlock 2 E LD Cathode 5 LD Anode 9 P D Cathode 6 PD Anode 7 9 Pin D Sub R1 49 U1 TIL117 9 V Batt Ipd Current CALIBRATION CIRCUIT Figure 3 1 lpp Calibration Circuit 2 Set the LASER current limit LIM to 200 mA Set the IPD set point to 1600 uA and set the CAL PD parameter to zero This puts the LCM 39425 into a constant Ipp mode 3 Turn the LASER ENABLE ON switch and press the appropriate OUTPUT ON switch to turn the LASER output on The TEC output will also be on If the LASER output is not on the LASER Ipp calibration mode cannot be entered 08 13 LCM 39425 19 CALIBRATION Laser Controller Calibration Procedures 4 Press the GPIB LOCAL and LASER DISPLAY Ipp Ppp switches at the same time to place the LCM 39425 in its LASER IPD Calibration mode After a few seconds the LDC 3900 will beep and the LASER display will show the lpp set point value 5 After the value on the LASER display is stable has not changed by more than one digit for several seconds the LCM 39425 is ready for the actual Ipp value to be entered Press and hold in the PARAMETER SET switch and turn the ADJUST knob until the LASER display shows the correct value as shown on the calibrated ammeter or the calculated lpp value from Step 1 6 Release the PARAMETER SET switch to store the first
36. rmistor Sensing Current 10 100 uA user selectable Usable Thermistor Range 20 450 0009 typical User Calibration 08 13 Steinhart Hart LCM 39425 a 3 INTRODUCTION AND SPECIFICATIONS Specifications TEC Measurement Display Temperature Range 99 9 C to 99 9 C Thermistor Resistance 10 pA Setting 0 00 450 00 kQ 100 pA Setting 0 000 45 000 kQ TE Current 2 000 to 2 000 A Temperature Accuracy 0 5 C Thermistor Resistance Accuracy 10 pA Setting 0 05 kQ 100 uA Setting 0 005 kQ TE Current 0 05 A All values measured after a one hour warm up period Over any one hour period half scale output Over any 24 hour period half scale output Measured from resulting intensity fluctuations of a laser diode measured optically with a 150 kHz bandwidth photo detector Measurements made with 1 MHz detector are typically 10 higher ILX Lightwave model LNF 320 low noise filter option may be used if lower noise performance is required Maximum output current transient resulting from normal operational situations e g power on off as well as accidental situations e g power line plug removal For more information request ILX Transient Test Standards LDC 00196 Maximum output current transient resulting from a 1000V power line transient spike Tested to ILX Lightwave Technical Standard LDC 00196 Maximum monitor photodiode current drift over any 30 m
37. short circuit between these pins the TEC output will be disabled When this short circuit is present the TEC Interlock Error condition event will be reported in the TEC Event Status Register and the TEC Condition Status Register 08_13 LCM 39425 13 14 INSTALLATION AND OPERATION Booster Operation This circuit is useful for remote monitoring of temperature and therefore is labeled TEMP LIMIT on the back panel connector This interlock is intended for use with an external current booster A switch or control circuit of the user s own design is required It is left as an option which the user may or may not employ Booster Operation LCM 39425 The LCM 39425 may be used to control a booster current source which accepts a control signal of up to 410 0 volts A booster current source may be required if the LCM 39425 s 8 Watt output is not adequate to control a thermal load Whenever a connection is present between the BOOSTER PRESENT pin 14 and DIGITAL GROUND pin 15 of the back panel TEC Input Output connector the BOOSTER CONTROL SIGNAL pin 10 voltage will be available for controlling a booster TEC current source The Booster Enabled condition is reported in the TEC Condition Status register When the GPIB option is implemented this condition may be used to trigger a service request The booster current source should use the control voltage which is available between the BOOSTER CONTROL SIGNAL pin 10 and ANALOG GND
38. t changed by more than one digit for several seconds the LDC 3900 is ready for the actual value to be entered Press and hold in the PARAMETER SET switch and turn the ADJUST knob until the TEC display shows the correct value as calculated from Step 1 4 Release the PARAMETER SET switch to store the new calibration value into non volatile memory on the LCM 39425 The LDC 3900 will then beep to indicate that it is ready for the user to enter the calibration value for its negative polarity output 5 Repeat Steps 3 and 4 for the negative polarity of the TEC output current After the value for the negative polarity of the TEC output is entered the LCM 39425 will automatically calibrate its current limits and set points After a few seconds the LDC 3900 will return to its former state before calibration The LDC 3900 will beep when it has finished storing all of the new calibration values 08_13 LCM 39425 27 CALIBRATION TEC Calibration Procedures Remote Operation ITE Current Calibration The following procedure is for calibrating the ITE constant current source for both polarities of current This procedure calibrates the zero current set point automatically then it automatically drives the TE current output to internally set limits of 1 amp When each of these values is reached and is stable the user enters the actual value of the current as measured by an external DMM The LDC 3900 then automatically calibrates the TEC curre
39. t to be entered 6 Input the second actual measured LASER voltage as an lt nrf values as in Step 5 7 Once the second actual voltage value is entered the LDC 3900 will beep and the new calibration constants will be calculated and stored into non volatile memory on the LCM 39425 08_13 LCM 39425 23 A CALIBRATION Laser Controller Calibration Procedures Remote Operation Laser Voltage Measurement Calibration The following procedure is for calibrating the LASER voltage measurement via GPIB 1 With the LASER output off connect a calibrated voltmeter in parallel with a 49 Q 5 Watt low temperature coefficient resistor to the LASER output of the LCM 39425 pins 5 and 8 2 Select the LCM 39425 to be calibrated by sending the appropriate LAS CHAN x command where x is the channel number of the LCM 39425 Set the LASER current limit via the LAS LIM I 200 Set the set point via the LAS LDI 100 command 3 Tum the LASER ENABLE ON switch Enter the LAS OUT ON command to turn the LASER output on The TEC output will also be on If the LASER output is not on the LASER voltage calibration mode cannot be entered 4 Enter the LAS CAL LDV command to place the LCM 39425 in its LASER Voltage Calibration mode 5 After a few seconds the LDC 3900 will be ready for the actual laser voltage to be entered as an lt nrf values via the LAS LDV lt nrf values command The measured value of the voltage should not be ent
40. th the case closed The instrument is calibrated by changing the internally stored digital calibration constants BILA Lightwave LCM 39425 15 gt CALIBRATION Recommended Equipment Recommended Equipment Recommended test equipment for calibrating the LCM 39425 is listed below Equipment other than that shown in the table may be used if the specifications meet or exceed those listed If your LDC 3900 is equipped with the model 1231 GPIB IEEE 488 2 interface you may refer to later sections in this chapter for calibration procedures using the GPIB if desired Description Manufacturer Model Specification DMM HP 3457A 0 1 pA or 0 1 mV resolution DC Amps at 1 0 A 1 Resistance at 10 Q 0 02 Resistor 49 Q 5 W low TCR for voltage calibration lpp Calibration Resistors Metal Film R1 49 Q 1 1 4 W Metal Film R2 109 1 1 4 W High Power R3 10 9 5 W low TCR Optical Isolator TIL117 or equivalent 6 pin Connector D sub 9 pin male Battery 9 volts TEC Calibration Resistors Metal Film 10 KO for 100 LA calibration 100 Kg for 10 pA calibration High Power 10 10 W low TCR for current calibration Environmental Conditions Calibrate this instrument under laboratory conditions We recommend calibration at 23 C 1 0 C When necessary however the LCM 39425 may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 to 50 C Warm Up The LDC 3900 should b
41. ue gt To ensure measurement stability of the actual value when the measurement is taken as a part of an automated test the DMM measurement should be polled in a loop When the measured value is consistent within one digit for 5 seconds for example the actual value could be considered stable 4 Once the actual ITE value is entered via the TEC ITE command the new calibration value is stored into non volatile memory on the LCM 39425 The LDC 3900 will then be ready for the user to enter the negative calibration value 5 Repeat Steps 3 and 4 for the negative polarity of the TEC output current entering the absolute value of the measurement After the value for the negative polarity of the TEC output is entered the LCM 39425 will automatically calibrate its current limits and set points After a few seconds the LDC 3900 will return to its former state before calibration The LDC 3900 will beep when it has finished storing all of the new calibration values 28 LCM 39425 BILI Lightwave CALIBRATION TEC Calibration Procedures After the last TEC ITE value is entered the OPC query may be used to determine when the calibration sequence is done However the OPC or WAI command or OPC query should not be issued until after the last TEC ITE value is entered or the system will hang This happens because the LDC 3900 will wait indefinitely for an input yet not allow any input until the calibration is finished
42. ule Locking Screw Laser Diode Connector Sensor Select Switch _____ TEC Connector Module Locking Screw Figure 2 1 LCM 39425 Back Panel When operating the LCM 39425 module note the following differences from a standard module in the LDC 3900 front panel operation e Pressing the ADJUST switch will toggle between LAS adjust TEC adjust and none e The OUTPUT ON switch turns both the LAS and TEC outputs on or off together They are always both on or off The LASER MODE SELECT switch toggles between and P modes IHBW mode is not available on the LCM 39425 08_13 LCM 39425 7 INSTALLATION AND OPERATION The LASER Connector The LASER Connector On the back panel of the LCM 39425 you will find a 9 pin D connector for the LD connections The pinout diagram for this connector is shown in Figure 2 2 1 2 Interlock 3 Chassis Ground 6 4 5 Laser Cathode 6 PD Cathode 8 7 PD Anode 9 8 9 Laser Anode Figure 2 2 Back Panel LD Connector Connecting to Your Laser When connecting laser diodes and other sensitive devices to the LCM 39425 we recommend that the LDC 3900 be powered up and the LASER output be off OUTPUT LED unlit In this condition a low impedance shunt is active across the output terminals When disconnecting devices it is only necessary to turn the OUTPUT off Laser Diode Connections and Shielding IMPORTANT Before connecting the laser diode to the LDC 3900
43. wave CALIBRATION Laser Controller Calibration Procedures Local Operation Laser Voltage Measurement Calibration The following procedure is for calibrating the LASER voltage measurement via the front panel 1 With the LASER output off connect a calibrated voltmeter in parallel with a 49 Q 5 Watt low temperature coefficient resistor to the LASER output of the LCM 39425 pins 5 and 8 2 Select the LCM 39425 to be calibrated by pressing the appropriate ADJUST switch until the LAS indicator is orange Set the LASER current limit LIM I to 200 mA Set the LASER set point to 100 mA 3 Tum the LASER ENABLE ON switch and press the appropriate OUTPUT ON switch to turn the LASER output on The TEC output will also be on If the LASER output is not on the LASER voltage calibration mode cannot be entered 4 Press the GPIB LOCAL and LASER DISPLAY V switches at the same time to place the LCM 39425 in its LASER Voltage Calibration mode 5 After a few seconds the LDC 3900 will beep when it is ready to accept a new calibration value Press and hold in the PARAMETER SET switch and turn the ADJUST knob to enter the LASER voltage measurement value which appears on the DMM Release the PARAMETER SET switch to enter the value Once the actual voltage value is entered the LDC 3900 will beep It will then set the output to approximately one fourth of the original voltage and then it will expect the second calibration voltage poin
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