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LDX-36000 Commonly Used Commands

1. Service Request T ELA Enable Register Queue SRE lt nrf gt 0 2 co Error Not Empty 14 E Rspapspapipope e 5 Queue Laser Event Status Enable Register LAS ENABIe EVEnt lt nrf gt LAS ENABIe EVEnt Figure 4 6 Status Reporting Scheme Operation Complete Definition Note that Bit O of the Standard Event Status Register contains the status of the Operation Complete flag Enabling this bit via the command allows the user to update Bit 5 of the Status Byte Then if the SRE mask has Bit 5 set and the user issues an OPC command the SRQ signal will be generated upon completion of the currently processed commands This may be used to initiate service request routines which depend on the completion of all previous commands Operation Complete on the LDX 36000 is defined as No operations to the laser current source hardware are pending No EEPROM non volatile memory write cycles are in progress Note If the GPIB times out while waiting for a response either set the GPIB time out longer or use SRQ generated interrupts See the GPIB interface manual for time out configuration or SRQ programming setup The OPC OPC and WAI commands should not be used inside a calibration routine 03 10 LDX 36000Series 61 62 REMOTE OPERATION Status Reporting Output Off Register The Outp
2. Specifications CHAPTER Specifications Table 1 2 LDX 36000 Series Specifications Sheet 1 of 8 36010 12 36025 12 36050 12 36085 12 36125 12 DRIVE CURRENT OUTPUT Output Current Range CW 10A 25A 50A 85A 125A Pulse 20A 50A 100A 170A 220A HPulse 10A 25A 50A 85A 125A Setpoint Resolution 10 mA 10 mA 10 mA 10 mA 10 mA Setpoint Accuracy 0 1 10 0 1 10 0 1 20mA 0 1 80mA 0 1 120mA Settling Time cw 20 us 20 us 20 us 20 us 20 us Pulse 80 us 80 us 80 us 80 us 80 us HPulse 550 us 550 us 550 us 550 us 550 us Maximum CW Power 120W 300W 600W 1020W 1500W Compliance Voltage 12V 12V 12V 12V 12V Temperature Coefficient 350 ppm C 350 ppm C 50 ppm C 50 ppm C 50 ppm C Stability 100 ppm 100 ppm 100 ppm 100 ppm 100 ppm Noise and Ripple lt 5 mA rms 10 mA rms 20 mA rms 40 mA rms 60 mA rms Transients Operational 40 mA 40 mA 40 mA 40 mA 40 mA 1kV EFT Surge 80 mA 80 mA 100 mA 320 mA 320 mA QCW MODE 25 Pulse Width Pulse Mode Range 40 5 to 1ms 40 5 to 1ms 40us to 1ms 40us to 1ms 40 5 to 1ms HPulse Mode Range 1msto2s 1msto2s 1msto2s 1msto2s 1msto2s Resolution Pulse Mode 2 us 2 us 2 us 2 us 2 us HPulse Mode 01 0 5 us 01 0 5 us 0196 40 5 us 0196 40 5 us 0196 40 5 us Accuracy Pulse Mode 10 us 10 us 10 us 10 us 10 us HPulse Mode x 20 us 20 us 20 us 20 us 20 us Puls
3. Name Parameters Function AS LIM T NONE Returns the laser high temperature limit AS LIM V 1 Sets the laser compliance voltage limit AS LIM V NONE Returns the laser compliance voltage limit LASer LIV OUTPUT 1 Enables disables the LIV instrument mode the instrument will step the setpoint current in the amount of time specified by the delay value from the start value to the stop value at increments defind by the step value jASer LIV OUTPUT NONE Returns the LIV mode output status ASer LIV GETMEAS NONE Returns the LIV data from memory in a group of 25 data points For each step photodiode current laser current setpoint and laser forward voltage values are saved to memory ASer LIV STEP 4 Specifies the start current stop current step current and delay for LIV mode ASer LIV STEP NONE Returns the start current stop current step current and delay for LIV mode AS MODE NONE Returns the laser output mode AS MODE CW NONE Sets the output mode to CW AAS MODE HPULSE NONE Sets the output mode to hard pulse mode 5 MODE PULSE NONE Sets the output mode to QCW Pulse AAS MODE TRIG NONE Sets the output mode to QCW External Trigger LAS OUT 1 Enables disables the current source output LAS OUT 1 Returns the laser current output status LAS P 1 Specifies the output optical power from which is calculated the current source setpoint value LAS P NONE Returns the
4. 12 Laser Open Circuit 2 el e 13 Power Supply Failure 14 Power Supply Voltage Limit 6 514 3121110 15 lt Element Power Limit Laser Event Status Enable Register LAS ENABle EVEnt lt nrf gt LAS ENABle EVEnt 1 Laser Current Limit 256 Output On 2 Laser Voltage Limit 512 BadSteinhart Hart Conversion 4 High Temperature Limit 1024 Hardware Current Limit 8 Laser Open Circuit 2048 AC Power Failure 16 Interlock 1 State Change 4096 Laser Open Circuit 2 32 Interlock 2 State Change 8192 Power Supply Failure 64 Temp Sensor Open 16384 Power Supply Voltage Limit 128 Temp Sensor Shorted 32768 Pass Element Power Limit The enabled or disabled conditions can be set via the LASer ENABle EVEnt command LAS ENAB EVENT response 258 means a laser voltage limit or output status change will be reported in summarized form to the Status Byte Register Bit 2 Rad Hex Laser Enable Eve response H30 means that an interlock opening or closing will be reported to the Status Byte Register Examples 03 10 LDX 36000Series 97 COMMAND REFERENCE Command Reference LASer ENABle OUTOFF lt nrf value Action Parameters Notes 1 2 4 8 16 32 64 128 Examples 98 7 LDX 36000 Series DEVICE DEPENDENT Sets the Output Off Enable Register An lt nrf value gt whose sum represents the enabled bits
5. 29 Front Panel Operation 30 The Adjust Knob dett de ee 30 Display vio ed wp Re REI de eee ee Be ad A dee 30 Displ y 2 uma Boe bees Maa bees bed 31 Temperature Measurement Setup 32 Limit Setup 4223 5 ee ea aa be ee 34 Configuring the Operational Mode 35 Adjusting Current Setpoint 35 Enabling CW 35 Pulsed Mode Setup 36 QCW Pulse Mode 2 ade wade ae ee cans 38 QCW Trig 39 Hard P lse Mode uk eb eons bee bodes eee bees 40 Automatic Shutoff Conditions for Current Output 41 Additional Functions and Features 41 ii LDX 36000 Series Lightwave Adjusting Current Setpoint in Terms of Optical Power 41 Configuring External Photodiode Power Measurements 43 Adjustable Photodiode 43 LIV Sweep Mode 43 PUIS OUL Rae ied nae Ps a ei x Vee ENN 44 Trigger used
6. wen 60 Event Condition Registers 60 Operation Complete 61 Output Off 62 Command Timing 63 Sequential Overlapped Commands 63 Query Response Timing 63 03 10 LDX 36000Series iii Chapter 5 Command Reference Remote Command Reference Summary Command Reference Chapter 6 Calibration and Troubleshooting Calibration Beginning Calibration Laser Diode Current Setpoint Calibration QCW Calibration Laser Diode Voltage Measurement Calibration Voltage Limit Photodiode Current PDI Measurement Thermistor Calibration Troubleshooting Error Messages 503 ed on ex ae Paes 599 Appendix A Allowed QCW Space Allowed QCW Operating Region Appendix B Allowed QCW Space LDX 36125 24 All
7. 58 REMOTE OPERATION LDX 36000 Commonly Used Commands LDX 36000 Commonly Used Commands The complete LDX 36000 command set contains over 110 commands that allow complete remote operation under a variety of conditions and for a variety of applications Within the command set however is a smaller subset of commands that will meet the majority of the user s needs Table 4 8 LDX 36000 Commonly Used Commands Sheet 1 of 2 Command Parameters Function ERR NONE Returns errors generated since laser query LAS CALP 2 Enters laser s slope efficiency and threshold in order to set laser current in terms of optical output power LAS CALP NONE Returns currently entered laser slope efficiency and threshold values LAS CALPD 1 Sets external photodiode responsivity value for power monitor LAS CALPD NONE Returns currently entered photodiode responsivity value LAS CALT 3 Enters thermistor Steinhart Hart constants LAS CALT NONE Returns thermistor Steinhart Hart constants LAS DC 1 Sets duty cycle in pulse mode LAS DC NONE Returns the current duty cycle setpoint LAS F 1 Sets pulse frequency setpoint duty cycle will change as required to maintain current pulsewidth value LAS F NONE Returns pulse frequency setpoint LAS IPD NONE Returns external photodiode photocurrent LAS LDI 1 Sets the laser
8. OPC Common Operation Complete Query ICE Action Places an ASCII character 1 into the instrument s Output Queue when all pending operations have been finished Parameters None Notes See the IEEE 488 2 specification for additional information Examples OPC response 1 when all overlapped commands are complete PSC lt nrf value gt Common Power On Status Clear Action Sets automatic power on clearing of the enable registers Parameters lt nrf value gt where 0 disables power on clearing and 1 enables power on clearing Notes Registers affected Condition Status Enable Service Request Enable Event Status Enable Standard Event Status Enable Factory default condition Disabled In the disabled state the values of the enable registers are saved through power OFF ON The power on status clear flag see PSC is set false disallowing service request interrupts after power on In the enabled state the enable registers are cleared during power on The power on status clear flag see PSC is set true allowing service request interrupts after power on Examples PSC 0 Disable automatic power on clearing of the enable registers PSC 1 Enable automatic power on clearing of the enable registers PSC COMMON Power On Status Clear Query Action Requests the status of the power on status clear flag Parameters None Notes Response 0 The enable registers are saved through power off on 1 The
9. 2V 5V Output Trigger cio Pulse 500 Der i i lt i Minimum TTL High 2V 5V Rear Panel Pulse Output 50Q Figure 3 14 QCW Timing Diagram Hard Pulse Mode Some applications require the diode to be operated in a pulse mode with long pulse widths or hard pulses Hard Pulse mode is selected by pressing the QCW Mode Select button Figure 3 10 until the HPulse LED is illuminated In this mode pulsewidth is adjustable from 1 ms to 2 seconds Duty cycle and frequency are also adjustable as described previously Note The EXT PULSE OUT output is enabled for all QCW modes Note The EXT PULSE OUT output is designed to drive 50 Any measurement equipment connected to this output should be configured for 50 impedance as well Otherwise the output signal may induce extraneous noise in the measurement 40 LDX 36000 Series Lightwave OPERATION Front Panel Operation Automatic Shutoff Conditions for Current Output The following conditions will automatically cause the instrument to disable the current source output The opening of any interlock Laser Open Circuit Laser Voltage Limit Laser Current Limit Changing instrument operating modes High impedance error High load inductance Failed power supply Additional Functions and Features This section describes special functions and features of the LDX 36000 Series High Power Current Source Adjusting Current Se
10. Lightwave LDX 36000 Series 65 COMMAND REFERENCE Remote Command Reference Summary Remote Command Reference Summary This section contains all of the commands for the LDX 36000 Series High Power Current Source listed in alphabetical order Subsections for each path are presented listing the commands which are legal for that path See Figure 4 4 for the command path tree structure Table 5 1 Remote Command Summary Reference List Sheet 1 of 5 Name Parameters Function CLS NONE Resets the Standard Event Register Status Byte and Error Queue to zero DELAY 1 Creates a delay in the execution of further commands ERR NONE Returns errors generated since the last query ESE 1 Sets the Standard Event Status Enable Register ESE NONE Returns the value of the Standard Event Status Enable Register ESR NONE Returns the value of the Standard Event Status Register IDN NONE Returns the Device Identification string AS CAL LDI 2 Enters the slope and offset calibration constants for the laser current setpoint jAS CAL LDI NONE Returns the slope and offset calibration constants for the laser current setpoint jAS CAL LDV 2 Enters the slope and offset calibration constants for the laser compliance voltage measurement AS CAL LDV NONE Returns the slope and offset calibration co
11. Specifications CHAPTER 1 Table 1 2 LDX 36000 Series Specifications Continued Sheet 5 of 8 36010 35 36018 35 36040 30 36070 30 36125 24 DRIVE CURRENT OUTPUT Output Current Range CW 10A 18A 40A 70A 125A Pulse 20A 40A 80A 160A 220A HPulse 10A 18A 40A 70A 125A Setpoint Resolution 10 mA 10 mA 10 mA 10 mA 10 mA Setpoint Accuracy 0 1 10 0 1 10 0 1 20mA 0 1 80mA 0 1 120mA Settling Time cw 20 us 20 us 20 us 20 us 20 us Pulse 80 us 80 us 80 us 80 us 80 us HPulse 550 us 550 us 550 us 550 us 550 us Maximum CW Power 350W 630W 1200W 2380W 3000W Compliance Voltage 35V 35V 30V 30V 24V Temperature Coefficient 50 ppm C 50 ppm C 50 ppm C 50 ppm C 50 9 Stability 100 ppm 100 ppm 100 ppm 100 ppm 100 ppm Noise and Ripple lt 10 mA rms 10 mA rms 10 mA rms 40 mA rms 60 mA rms Transients Operational 40 mA 40 mA 40 mA 40 mA 40 mA 1kV EFT Surge 80 mA 80 mA 100 mA 320 mA 320 mA QCW MODE 25 Pulse Width Pulse Mode Range 40us to 1ms 40us to 1ms 40us to 1ms 40us to 1ms 40us to 1ms HPulse Mode Range 1msto2s 1msto2s 1msto2s 1msto2s 1msto2s Resolution Pulse Mode 2 us 2 us 2 us 2 us 2 us HPulse Mode 01 0 5 us 01 0 5 us 0196 40 5 us 0196 40 5 us 0196 40 5 us Accuracy Pulse Mode 10 us 10 us 10 us 10 us 10 us HPulse Mode 20 us 20 us 20 us 20 us 20 us Pulse Frequency Range 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1
12. A Users Guide LDX 36000 Series High Power Laser Diode Current Source qT ILC Lig nian A Newport Corporation Brand ILX Lightwave gt 31950 Frontage Road Bozeman MT U S A 59715 U S amp Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www newport com ilxlightwave TABLE OF CONTENTS L L L L a El El w a El El a a a Safety Information and the xi General Safety 5 5 xi Safety Marking Symbols xiii Comments Suggestions and Problems XV Chapter 1 Introduction and Specifications Product Overview 2 Installation uci RE PERS RERO URP A Re Rb d xn 4 Initial Inspection 4 Grounding Requirements 4 AC Power Requirements 4 GPIB Communications 4 Tilt Foot Adjustment 5 Shipping ee ede vedere Phe gale ptu ege 5 External InterloCKs sse RR Oe oe eae he 5 Obtaining Repair Services 6 Options and Accessories 6 Specification
13. 3 8 cm and feet add 0 56 1 4 cm to overall dimensions Hardware fault detection time due to an open circuit intermittent contact voltage or current limit AC power failure Pulse mode specifications are also external trigger mode specifications In keeping with our commitment to continuous improvement ILX Lightwave reserves the right to change specifications without notice for such changes 03_10 LDX 36000 Series 15 INTRODUCTION AND SPECIFICATIONS Specifications 16 7 LDX 36000 Series Lightwave CHAPTER SAFETY Bu E a a ii a a El mH El Ej Es El a E This chapter describes the potential hazards inherent in the operation of the LDX 36000 series laser controller with high power laser diodes These hazards may be mitigated by restricting operation to only appropriately trained personnel Electrical Safety AA warnine High power laser diodes require large magnitude currents to operate These currents may range from several Amps to over 100 Amps This does pose a significant electrocution hazard the high currents may damage or destroy conductive material that is accidentally placed across the instrument s output terminals Verify all electrical connections prior to enabling the output Do not adjust or handle bare electrical connections without ensuring the output is off and a safety interlock is open In addition improperly sized output cables and poor connections may get hot due to Joule heating Continued
14. 40 Figure 3 15 Determining Output Current Setpoint 42 03_10 LDX 36000 Series v Figure 4 1 GPIB Cable Connections 48 Figure 4 2 GPIB Connector Diagram 49 Figure 4 3 GPIB Loca 50 Figure 4 4 Command Path Structure 54 Figure 4 5 Common Command Diagrams 56 Figure 4 6 Status Reporting Scheme 61 Figure 4 7 Laser Output Off Register 62 Figure A 1 Allowed QCW Operating Region 140 Figure B 1 Allowed QCW Operating Region for LDX 36125 24 142 vi 8 LDX 36000 Series Lightwave LIST OF TABLES L L L a a B El El E E El E a a a a Table 1 1 Options and 6 Table 1 2 LDX 36000 Series 7 Table 3 1 LDX 36000 Series Default Configuration 24 Table 3 2 Display 32 Table 3 3 Typical 10 kW 9 25 C Thermistor Calibration Values 33 Table 3 4 Configuring QCW 36 Table 3 5 Automated L I V Mode GPIB Commands 44 Table 4 1 Acceptable 0 51 Table 4 2 White 51 Table 4 3 Query 0 52
15. FRONT PANEL DEVICE DEPENDENT Action Sets Display 2 to show the QCW Pulse mode pulse frequency Parameters None Notes The frequency display is automatically turned off when another display selection is enabled Function is disabled unless QCW Pulse mode Examples LAS DIS F action enables the frequency display on Display 2 88 7 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer DISplay Frequency FRONT PANEL DEVICE DEPENDENT Action Returns the status of the frequency display Parameters None Notes In local operation the status of the f button is indicated by the annunciator to the right of Display 2 Hz will be illuminated when the display is in duty cycle mode Examples LAS DIS DC response 0 means that the frequency button f is not currently active frequency is not being shown on Display 2 LAS DIS DC response 1 means that the frequency button f is currently active frequency is shown on Display 2 LASer DISplay LDI FRONT PANEL DEVICE DEPENDENT Action Sets Display 1 to show output current setpoint Parameters None Notes The output current setpoint display is automatically turned off when another display selection is enabled Examples LAS DIS LDI action enables the output current setpoint display on Display 1 LASer DISplay LDI FRONT PANEL DEVICE DEPENDENT Action Returns the status of the output current setpoint di
16. If either interlock has opened no thermistor has been connected to the temperature sensor inputs or the measured temperature has exceeded the set temperature limit the appropriate indicator will flash The indicators below the display are divided into two groups instrument mode Const 96 Const Freq and error indicators If any error has been detected the output will be disabled This behavior may be changed via the Output Off Register described in detail in Chapter 4 03 10 LDX 36000 Series 31 OPERATION Front Panel Operation Table 3 2 Display Indicators Condition Action Current Limit Current Limit LED flashes at 1 Hz Voltage Limit Voltage Limit LED flashes at 1 Hz If the limit is reached the output will be disabled Open Circuit Output off Open Circuit LED flashes at 1 Hz If this condition was caused by excessively high compliance voltage the Voltage Limit LED will be illuminated as well Const Duty cycle percentage remains constant when pulsewidth is changed resulting in a change in output frequency Illuminated when either left hand Py or button is pressed Const Freq Output pulse frequency remains constant when pulsewidth is changed resulting in a change in duty cycle Illuminated when either right hand P or Freq button is pressed Interlock 1 Output off Interlock 1 LED flashes at 1 Hz Interlock 2 Output off Interlock 2 LED flashes at 1 Hz Temp Sensor Ope
17. Safety Features and Compliance to Government Regulations Caution refer to manual Figure 2 2 LDX 36000 Series Rear Panel Labels gt 50 A LDX 36000 Series 22 CHAPTER 3 OPERATION E E El a ii a mH El mH El Ej a E E This chapter is an introduction to the operation of the LDX 36000 Series High Power Current Sources It offers instructions for connecting a high power laser to the current source and describes powering up the instrument This chapter also contains step by step procedures on how to operate the current source in CW and QCW modes ILX recommends that this chapter be read before operating the instrument Power Up To turn on the LDX 36000 rotate the keyswitch in the POWER section of the front panel from tol This action initiates the power on sequence If the LDX 36000 does not appear to turn on verify that it is connected to AC line power If line power is not the problem remove the power cord and check the line power fuse Note The instrument contains several safety interlocks that must be satisfied in order to enable the output Verify that these interlocks are connected to appropriate safety switches or are shorted before attempting to enable the output The key is removable only when it is in the or OFF position This is done so that the current source cannot be prevented from being turned off in case of an emergency Power Up Sequence During the power up sequence the following sequenc
18. Unable to adjust output Verify that the current annunciator A is flashing When it is flashing the current or optical power via current may be adjusted Verify the current limit is set greater than zero No output in optical power mode even though front panel indicates the laser should be outputting light Laser is outputting light even though front panel says it should be below threshold Output exceeds displayed power Verify the correct values for threshold and slope efficiency have been entered check by observing the values stored for the parameter Cal P Output current is determined by back calculating from the displayed power and the stored values for threshold and slope efficiency Voltage Limit indicator blinks This indicates a voltage limit error Check laser connections A high impendance may cause this condition especially at high current levels LDX 36000 Series 133 134 9 Troubleshooting CALIBRATION AND TROUBLESHOOTING Open Circuit error E503 or Voltage Limit error E505 prevents output from reaching desired value The LDX 36000 series has an adjustable compliance voltage Check to see if the voltage limit setting is too low Check laser connections Measured voltage always reads zero Verify voltage sense lines are connected across load Vsense to laser anode Vsense to laser cathode Cannot set or control temperature Temperature is a measur
19. If the first optional parameter is entered as zero LAS DEC 0 the command will be ignored The minimum time to complete one decrement is approximately 20 ms Therefore values for the second optional parameter time between decrements have a practical minimum of 20 Examples LAS DIS LDI LAS STEP 0 3 LAS DEC action The current source setpoint is decremented by 300 mA since the current display mode is output current LAS CALP 1 5 75 LAS DIS P LAS STEP 0 1 LAS DEC 5 1500 action The output is decremented in a series of 5 100mW steps with an approximate 1 5 second delay between each step The actual current setpoint is varied by back calculating from the optical power by using the threshold and slope efficiency values entered via the LAS CALP command 03 10 LDX 36000Series 85 86 COMMAND REFERENCE Command Reference LASer DELAYIN lt nrf value gt PANEL DEVICE DEPENDENT Action Configures the delay in seconds between an input trigger pulse and the rising edge of the output current pulse Parameters One nrf value representing the delay in seconds with a range of 20x10 s 20 us to 1 second with a resolution of 1 us Notes The default value is 20 us The delay between input trigger and output pulse along with the input trigger itself are only enabled when the instrument is in QCW Trig mode Refer to Figure 3 17 for a QCW timing diagram illustrating the relationship between input and out
20. be eG Pc t Ghee 45 Trigger QUE seeds DERE RE XR Rb e ADE 45 Saving and Recalling from the Front 46 Chapter 4 Remote Operation Basic GPIB Concepts 47 Data and Interface Messages 47 Talkers Listeners and Controllers 48 GPIB Cable Connections 48 GPIB Connector 48 Reading the GPIB 0 55 50 Changing the GPIB 5 50 Changing Operation from Local to Remote 50 Command Syntax 51 51 While Space ss csse EE ed e px Yes AR e EN WO ed eee 51 Terminators 2 xau Re m dece EU dox ee as aes 52 Command Separators 52 sus eae Pe bdo 52 Command Tree Structure 54 Syntax Summary 55 IEEE 488 2 Command Commands 56 LDX 36000 Commonly Used Commands 58 Status Reporting 224542444 dares 25555545
21. Also included are connectors for mating to the high current output connectors For current sources of lt 50 A a DB 25 pin connector pins and hood are included in the shipping kit For current sources of gt 50A high current output lugs and screws are provided to attach to the output pads on the rear panel For QCW operation with the ILX CC 390 output cable a high current crown connector is also included in the high current shipping kit External Interlocks The instrument s rear panel contains two pairs of terminal blocks which are used for connecting to two independently monitored interlock circuits The terminals of each terminal block must be shorted to satisfy each interlock As an example of their use one interlock could be connected to the flowswitch in a liquid cooling unit while the other could be tied to a door sensor However both are simply labeled as Interlock 1 and Interlock 2 to allow complete flexibility for the user 03_10 LDX 36000 Series 5 INTRODUCTION AND SPECIFICATIONS Installation Obtaining Repair Services The instrument may at some point need to be returned to the factory for service whether or not it is under warranty If the warranty has expired there will be a nominal charge for repair and or calibration See the section entitled Returning an Instrument in the Preface for shipping and contact information AA warnine Potentially lethal voltages exist within the LDX 36000 chassis even with the k
22. as SS 1711 171 2 D meer ppp d 7 __ SE CS SC SS SS ee ee ee a au a p2 SZL9 4 eoeds M20 000001 2 Anuanbai4 Lightwave 1407 LDX 3600 Series APPENDIX B ALLOWED OCW SPACE LDX 36125 24 E This Appendix illustrates the relationships of pulse frequency versus duty cycle for several different pulsewidth values This information should be used as a guide to the user so they may properly configure their required QCW parameters Lightwave LDX 36000 Series 141 ALLOWED OCW SPACE LDX 36125 24 Allowed OCW Operating Region for 36125 24 Allowed QCW Operating Region for 36125 24 e A9 Ang 4 a 0001 00001 MOD Pe ollV 2 52 96 Lightwave 2 Aouenbaiy Figure B 1 Allowed QCW Operating Region for LDX 36125 24 1427 LDX 3600 Series
23. of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps Record the value of current measured by the current transducer Calculate the slope and offset of the CW current setpoint with the following equations slope 36000 80 setpoint 36000 20 setpoint Transducer 80 measurement Transducer 20 measurement offsetAmps 36000 80 setpoint slope Transducer 80 measurement Convert the offset in terms of amps to offset in terms of DAC counts offsetDacCounts 65 535 1 1 QCW CURRENT Send the CW current setpoint calibration to the 36000 using the following command LAS CAL QCWLDI slope offsetDacCounts Set the current setpoint to 50 of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps Record the value of current measured by the current transducer Verify that the current setpoint is within the accuracy specifications of the instrument LDX 36000 Series 127 CALIBRATION AND TROUBLESHOOTING Laser Diode Voltage Measurement Calibration Laser Diode Voltage Measurement Calibration 1 Set the 36000 Display to Voltage by sending the following command LAS DIS V 2 Set the voltage calibration to default values by sending the following command LAS CAL LDV 1 0 3 Connect an adjustable voltage source to the laser diode voltage sense lines located
24. one of the LEDs in either the CW Mode box or the QCW Mode box will be illuminated to specify which type of mode is selected To switch between CW and QCW modes the operational mode selection button must be pressed twice Adjusting Current Setpoint Press the button in the Display 1 Adjust box Figure 3 5 to display laser current setpoint in Amps Next r otate the Adjust knob to the current setpoint required If no other button is pressed the Adjust knob will remain active to allow adjustments to the current without any intervening keypresses However if any other button is pressed with the exception of the P Ppp button the button must be pressed again before drive current can be changed In the case of the P Ppp button drive current is being adjusted terms of optical power Enabling CW Output MODE Figure 3 10 CW Mode Box in the background in an effort to change the output in CW current output is enabled by pressing the Output button in the CW Mode box shown in Figure 3 9 Once pressed there is a two second delay before output is actually enabled This is a required safety feature and cannot be disabled During this waiting period the output ON LED will flash After the two second delay the output shorting relays will open the output will be enabled and the LED will stop flashing and remain on Note After the initial two second delay the current will be ramped up
25. 05 Interlock 2 Error D 06 Temp Sensor Open i 07 Temp Sensor Shorted si 08 Output On 5 09 Bad Steinhart Hart Conversion i 10 Hardware Current Limit 11 AC Power Failure sex ess es qe epe ene 12 Laser Open Circuit 2 4 el ae 2 13 Power Supply Failure 14 Power Supply Voltage Limit 7 Je 5 4 3 I2 1 o 15 Pass Element Power Limit Laser Condition Status Enable Register MTASENABIe COND 1 Laser Current Limit 256 Output On 2 Laser Voltage Limit 512 Bad S H Conversion 4 High Temperature Limit 1024 Hardware Current Limit 8 Laser Open Circuit 2048 AC Power Failure 16 Interlock 1 Error 4096 Laser Open Circuit 2 32 Interlock 2 Error 8192 Power Supply Failure 64 Temp Sensor Open 16384 Power Supply Voltage Limit 128 Temp Sensor Shorted 32768 Pass Element Power Limit The laser conditions which are reported to the status byte are set via the LASer ENABle COND command The Open Circuit condition is only present while the output is on and when the hardware detects this condition it will disable the output Therefore the Open Circuit condition is fleeting and may be missed via the LAS COND query Therefore the user should test for the Open Circuit Event via the LAS EVEnt query The condition status is constantly changing while the event status is only cleared
26. 120 EVENT TRIGGERING ALL MODELS Trigger Output TTL Level active high Pulse Width 10 us Delay Programmable Accuracy 2 us 0 05 Range 0 us to 1s Resolution 0 0196 4 5 us Jitter 100 ns Trigger Input TTL Level rising edge triggered single shot to 1 KHz high impedance Delay to Output Programmable Accuracy 2 us 0 05 Range 20 us to 1s Resolution 0 0196 5 us Jitter 200 ns Pulse Trigger Output TTL Level high impedance active high 8 7 LDX 36000 Series Lightwave INTRODUCTION AND SPECIFICATIONS Specifications Table 1 2 LDX 36000 Series Specifications Continued Sheet 3 of 8 CHAPTER 1 36010 12 36025 12 36050 12 36085 12 36125 12 MEASUREMENT Forward Voltage Range 0 to 12 00V 0 to 12 00V 0 to 12 00V 0 to 12 00V 0 to 12 00V Resolution 10 mV 10 mV 10 mV 10 mV 10 mV Accuracy 0 05 20mV 0 05 20mV 0 05 420mV 0 05 20mV 0 05 20mV Photodiode Current Range to 10000A to 10000 to 10000 to 10000 3 to 10000 Resolution 3 pA 3 pA 3 pA 3 pA 3 pA Accuracy 40 196 40 196 40 196 40 196 40 196 Reverse Bias Range 0 to 15 V 0 to 15 V to 15 V 0 to 15 V to 15 V Resolution 100 mV 100 mV 100 mV 100 mV 100 mV Accuracy 2 5 FS 2 5 FS 2 5 FS 2 5 FS 2 5 FS PD Responsivity Range mA W 0 001 to 100 00 0 001 to 100
27. 2500W 0 to 2500W 0 to 2500W Resolution 1W 1W 1W 1W 1W P1 Slope Efficiency Range W A 0 00 to 100 0 0 00 to 100 0 0 00 to 100 0 0 00 to 100 0 0 00 to 100 0 Resolution W A 0 01 0 01 0 01 0 01 0 01 P2 Threshold Range W A 0 00 to 10 00 0 00 to 20 00 0 00 to 40 00 0 00 to 68 00 0 00 to 125 00 Resolution W A 0 01 0 01 0 1 0 1 0 1 Temperature Sensor Type 10K Thermistor Range 99 to 199 9 C Thermistor Current 100 pA 100 pA 100 pA 100 pA 100 pA Accuracy 40 1 C LASER DIODE PROTECTION Output shorting relay normally closed 2s turn on delay per 21CFR 1040 10 Hardware Fault Response 24 Current Limit 2 us Open Circuit 50 us Intermittent contact protection AC power failure brown out detection Transient protection output on off power up down EFT surge 1000V 03 10 LDX 36000 Series 13 INTRODUCTION AND SPECIFICATIONS Specifications Table 1 2 LDX 36000 Series Specifications Continued Sheet 8 of 8 36010 35 36018 35 36040 30 36070 30 36125 24 Adjustable current and voltage limit redundant hardware current and voltage limit Error monitoring and reporting INTERLOCKS Interlock 1 Normally open close to enable output Interlock 2 Normally open close to enable output Fault Response Time22 lt 6 ms GENERAL GPIB Interface IEEE 488 On Board Memory Storage 1000 points On Board Upl
28. DEPENDENT Action Sets Display 1 to show measured output power from external photodiode Parameters None Notes Display will show measured photocurrent in Amps unless a nonzero value for responsivity has been entered via the front panel or the LAS CALPD command When a nonzero responsivity has been entered display will indicate optical power in Watts with a second annunciator PD being illuminated to indicate this is a photodiode measurement The output power display is automatically turned off when another display section is enabled LASer DISplay PPD COMMO FRONT PANEL DEVICE DEPENDENT Action Returns the status of thephotodiode power measurement display Parameters None Notes In local operation the status of the PPD button is indicated by annunciators to the right of Display 1 W and PD will be illuminated when the display is in PPD mode Examples LAS DIS PPD response 0 means that the photodiode power measurement display is not currently active measured optical power or photocurrent is not being shown on Display 1 LAS DIS PPD response 1 means that the photodiode power measurement display is currently active measured optical power or photocurrent is shown on Display 1 03_10 LDX 36000 Series 91 COMMAND REFERENCE Command Reference LASer DISplay PWF FRONT PANEL DEVICE DEPENDENT Action Sets Display 2 to show constant frequency pulsewidth setpoint in QCW Pulse Trig and Hard pulse modes Parameter
29. Parameters An lt nrf value gt whose sum represents the enabled bits Notes The sum of the enabled bits and must be a value between 0 and 65535 as detailed below Laser Event Status Register LASer EVEnt agga 3 2 1 0 gp Laser Curent Limit LDX 36000 Series 01 Laser Voltage Limit 4 02 High Temperature Limit 2 03 Laser Open Circuit amp 04 Interlock 1 State Change ej 05 Interlock 2 State Change E 06 Temp Sensor Open Logical 07 Temp Sensor Shorted OR 08 Output On ES 09 Bad Steinhart Hart Conversion t 10 Hardware Current Limit ES TUE 11 AC Power Failure A eal ipis 5 FEES 12 Laser Open Circuit 2 Ct SL EL 13 Power Supply Failure 14 Power Supply Voltage Limit 0 2 8 Te RT To 15 Pass Element Power Limit Laser Event Status Enable Register LAS ENABIe EVEnt lt nrf gt LAS ENABIe EVEnt 1 Laser Current Limit 256 Output On 2 Laser Voltage Limit 512 BadSteinhart Hart Conversion 4 High Temperature Limit 1024 Hardware Current Limit 8 Laser Open Circuit 2048 AC Power Failure 16 Interlock 1 State Change 4096 Laser Open Circuit 2 32 Interlock 2 State Change 8192 Power Supply Failure 64 Temp Sensor Open 16382 Power Supply Voltage Limit 128 Temp Sensor Shorted 32768 Pass Element Power Limit The enabled or disabled conditions can be read via the LASer ENABle EVEnt query The even
30. accessible from a terminal block on the rear panel Figure 3 3 The terminals from both sets must be shorted to enable the output External Interlocks Figure 3 4 External Interlocks The interlocks are labeled Interlock 1 and Interlock 2 to allow complete flexibility in how they are used If either circuit is opened the laser current output is disabled and the appropriate interlock LED on the front panel is illuminated If an attempt is made to enable the output with an interlock open error E 501 will be generated in the error queue and displayed on the front panel A CAUTION The interlock terminals must remain isolated from all other connections including earth ground Forward Voltage Measurement The LDX 36000 will measure and display forward voltage when the output current is enabled Voltage measurement is only possible when the voltage sense lines from the rear panel measurement connector are attached directly to the laser diode If these lines are not used measurements will always read zero Voltage measurement through the output cable is not possible These lines are available on the back panel connector labeled Sense Refer to Figure 3 2 the pinout Note A cable separate from the output cable is required for voltage measurements 28 LDX 36000 Series Lightwave OPERATION Connections for General Operation External Photodiode Measurement If a photodiode has been configured to measure the
31. action output is disabled if it was on and the output mode is changed to CW LASer MODE HPULSE COMMO FRONT PANEL DEVICE DEPENDENT Action Places the LDX 36000 in hard pulse mode Parameters None Notes If the output was enabled when the command is given the output will be disabled prior to changing modes If the command is given when the instrument is already in the specified mode the output will be disabled In this mode pulse width frequency and duty cycle are controlled either from the front panel or via GPIB Examples LAS MODE HPULSE action output is diabled if it was on and the output mode is changed to hard pulse mode when the instrument is in QCW mode 108 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer MODE PULSE ei FRONT PANEL DEVICE DEPENDENT Action Places the LDX 36000 in QCW Pulse output mode Parameters None Notes If the output was enabled when the command is given the output will be disabled prior to changing modes If the command is given when the instrument is already in the specified mode output will be disabled In this mode pulsewidth frequency and duty cycle are controlled either from the front panel or via GPIB Examples LAS MODE PULSE action output is disabled if it was on and the output mode is changed to QCW Pulse LASer MODE TRIG CO FRONT PANEL DEVICE DEPENDENT Action Places the LDX 36000 in QCW Trigger output mode Paramet
32. also interpreted as white space Do not use white space before the question mark in a query command If problems are encountered with communications the terminator string may be the cause Refer to the GPIB interface controller manual for additional information The instrument accepts NL lt END gt or lt NL gt lt 4END gt as a command line terminator Many computers terminate with lt CR gt lt NL gt lt END gt Carriage Return New Line EOI The instrument ignores CR Carriage Return as white space The LDX 36000 terminates its responses with CR NL END unless the TERM command is used to change it More than one command may be on the same line same command string if the commands are separated with semicolons GPIB uses a flexible representation for numeric parameters integer floating point or engineering scientific notation There are no default values for omitted parameters Some device dependent GPIB commands are compound commands in which the first mnemonic opens a path to a set of commands relating to that path The second mnemonic then defines the actual command Following are examples of invalid syntax command strings that will produce errors Table 4 6 Invalid Syntax Command Strings Command Comment LAS MODE CW Missing colon MODE expected LAS OUT ON INC Missing semicolon INC command generates an error LAS DIS Space not allowed before question mark DIS command e
33. amount in Amps ranging from 0 01 A to the maximum current output for the specific instrument model Notes A step value of 0 01 corresponds to the smallest display resolution for the mode When displaying output current a step of 0 1 corresponds to current step of 100 mA When displaying optical power with a nonzero value for the laser threshold a step of 0 1 corresponds to a power step of 100 mW Examples LAS LDI 2 0 LAS STEP 0 5 LAS INC LAS LDI action set step size to 500 mA so the LAS LDI query will return a value of 2 5 A LASer STEP DEVICE DEPENDENT Action Returns the amount the laser current or optical power setpoint may be incremented or decremented by the LAS INC or LAS DEC commands Parameters None Notes A step value of 0 1 corresponds to the smallest display resolution for the mode When displaying output current a step of 0 1 corresponds to current step of 100 mA When displaying optical power with a nonzero value for the laser threshold a step of 0 1 corresponds to a power step of 100 mW Examples LAS STEP response 0 1 means the step size is either 100 mA or 100 mW depending on the mode LDX 36000 Series 7 113 COMMAND REFERENCE Command Reference MESsage lt ASCII string gt DEVICE DEPENDENT Action Allows entry of an ASCII string of up to 16 non zero characters This command may be useful for storing messages which relate to a test or configuration Parameters ASCII string with up to 16 non
34. as damage light sensitive elements in video cameras photomultiplier tubes and photodiodes Specular as well as diffuse reflections may cause unexpected damage as well Because of this the user is recommended to observe the following precautions 18 7 LDX 36000 Series Lightwave SAFETY Optical Safety 1 Observe all safety precautions in the user s manual 2 Extreme caution should be exercised when using solvents in the vicinity of the laser 3 Restrict access to the area in which the laser resides to personnel familiar with laser safety practices and who are aware of the dangers involved 4 Never look along the optical axis of the laser source or at scattered radiation from any reflective or partially reflective surface 5 Remove any reflective jewelry such as watches bracelets or rings to prevent inadvertent reflections 6 Keep the beam path in any experimental setup in a horizontal plane and at low heights to prevent inadvertent eye exposure at eye level when standing as well as when sitting Lx WARNING Wear laser safety glasses to protect against the radiation generated by the laser It is assumed that the user has read this section and is familiar with laser safety practices and the dangers involved Ensure all personnel in the area are wearing laser safety glasses If there are any questions regarding eyewear or laser safety procedures contact the company s Laser Safety Officer 7 As a precaution against accidenta
35. at any time with the RECALL function This saves setup time and it reduces the chance of setup error for tests which are periodically repeated For example one test may require QCW Pulse mode with a fixed pulsewidth of 250 us a pulse rate of 100 Hz and a peak current of 3 5 A This test is performed on a fixture with an embedded calibrated thermistor A second test using a totally different fixture with no temperature monitoring may require CW mode with a current of 5 A Storing these two test configurations in two memory locations allows them to be quickly retrieved and used when needed Note Memory location 0 is reserved for the factory default configuration It cannot be overwritten To enter the Save Recall mode repeatedly press the Parameter Select button Figure 3 7 until the SAVE or RECALL LED as required is illuminated The currently selected Save Recall location will be shown in Display 1 Press the Parameter Set button and rotate the Adjust knob to change to a different location Releasing the Set button completes the Save Recall operation and all instrument parameters will be saved or recalled as appropriate to from the displayed location When a configuration is recalled from memory the instrument is restarted and the front panel parameters are reconfigured to the new parameter set 46 LDX 36000 Series Lightwave CHAPTER REMOTE OPERATION E E El ii a mH El El El Hi El Ll E Test and measure
36. connector The extra pins are used to make twisted pairs with several of the lines 48 LDX 36000 Series Lightwave REMOTE OPERATION Basic GPIB Concepts There are eight data input output lines three handshake lines and five interface management lines Eight data I O DIO lines carry both data including device dependent commands and interface messages The ATN interface management line determines whether these lines contain data or interface messages Three handshake lines ensure that all data and messages are reliably transferred NRFD not ready for data indicates whether a device can receive the next byte of data or message NDAC not data accepted indicates whether a receiving device has accepted a byte of data or message DAV data valid indicates that the signal levels on the data lines are stable and available for the receiving device s to accept Five interface management lines control the flow of information attention is set by the controller in charge to define the I O lines for data or interface messages IFC interface clear is set by the system controller to initialize the bus and assert itself as controller in charge REN remote enable is set by the controller to place addressed devices into remote or local front panel control mode SRQ service request can be set by any device in the system to request service from the controller EOI end or identify is us
37. convert between photodiode current and optical power of the laser diode To enter the CAL PD parameter select CAL PD with the SELECT push button by toggling down past CAL P The indicator becomes lit when CAL PD is selected and DISPLAY 1 indicates the responsivity parameter in mA W not annunciated Next press the Parameter Set button and rotate the Adjust knob to change responsivity values with units of mA W To calculate the responsivity 1 Measure with a calibrated detector the output power of the device Illuminate the detector to be used for power measurement Measure the corresponding photodiode current N Calculate the responsivity by dividing the photodiode current by the optical power noting the units required are mA W Adjustable Photodiode Bias An adjustable reverse bias of 0 15 VDC is provided for best linear response of the photodiode To set the photodiode bias press the Parameter Select button Figure 3 7 until the PD BIAS LED is illuminated The bias level is indicated on Display 1 in Volts Next press the Parameter Set button and rotate the Adjust knob to change the bias level LIV Sweep Mode An automated L I V mode is available on some LDX 36000 Series instruments and is accessible through GPIB commands only LDX 36010 12 10 20 12V output LDX 36025 12 25 50 12V output LDX 36050 12 50A 100A 12V output In this mode the instrument automatically executes an L I V sweep initialized from a c
38. enable registers are cleared during power on Registers affected Condition Status Enable Service Request Enable Event Status Enable Standard Event Status Enable See Chapter Four for more information on register structure Examples PSC Request state of power on status clear flag LDX 36000 Series 115 116 COMMAND REFERENCE Command Reference PUD arbit block Programmable User Data Action Parameters COMMON FRONT PANEL DEVICE DEPENDENT Stores data unique to the instrument such as calibration date model number and serial number This data is protected from change by the SECURE command and is usually entered at the factory The arbitrary block program data is exactly 25 bytes long PUD Programmable User Data Query COMMON FRONT PANEL EPENDENT Action Requests the factory stored identification string Resistance FRONT PANEL DEVICE DEPENDENT Action Returns the measured thermistor resistance in ohms Parameters None Notes This command is used to verify the accuracy of the thermistor calibration see Chapter 6 for more information Examples R response 11215 547 means the thermistor resistance is 11215 547 ohms LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference RADix lt DEC BIN gt COMMO Action Parameters Notes Examples ONT PANEI DEVICE DEPENDENT Selects radix type for status condition and event query r
39. front panel or via GPIB To change them from the front panel perform the following procedure Figure 3 8 Selecting Parameters 1 Repeatedly press the Parameter Select button Figure 3 9 until the CAL T LED is illuminated and C1 is shown in Display 1 2 Press the Parameter Set button and rotate the Adjust knob until the correct value is shown The value is automatically stored in nonvolatile RAM after a three second timeout or the next step is followed 3 Press the Parameter Select button again to change the displayed constant to C2 4 Press the Parameter Set button again and rotate the Adjust knob to dial in the new value 5 Press the Parameter Select button once again to change to constant C3 C3 should be shown in Display 1 6 Press the Parameter Set button so the value shown in Display 2 may be changed These values are stored in nonvolatile RAM and will remain in effect until manually changed or a different configuration is recalled from memory Limit Setup Other than configuring the thermistor for temperature measurement the other major configuration requirement is the setting of the current voltage and temperature limits To adjust current limit press the Parameter Select button Figure 3 8 until the LIM I LED is illuminated If the thermistor constants have just been set two presses of the Parameter Select button will illuminate the LIM LED otherwise the
40. in the DB9 on the back panel of the 36000 4 Connect a DMM to measure the output of the voltage source 5 Set the voltage source to 20 of the maximum voltage measurement of the instrument 6 Measure and record the voltage output with the DMM 7 Measure and record the voltage with the 36000 by sending the following command LAS LDV 8 Setthe voltage source to 8096 of the maximum voltage measurement of the instrument 9 Measure and record the voltage output with the DMM 10 Measure and record the voltage with the 36000 by sending the following command LAS LDV 11 Calculate the slope and offset of the voltage measurement with the following equations slope 0 80 measurement DMM 20 measurement 36000 80 measurement 36000 20 measurement offset DMM 8096 measurement slope 36000 8096 measurement 12 Send the voltage measurement calibration to the 36000 using the following command LAS CAL LDV slope offset 13 Set the voltage on the voltage source to 50 of the full scale voltage measurement 14 Measure and record the voltage with the 36000 by sending the following command LAS LDV 15 Verify that the voltage measurement is within the accuracy specifications of the instrument 1287 LDX 36000 Series Lightwave CALIBRATION AND TROUBLESHOOTING Voltage Limit Setpoint Voltage Limit Setpoint 10 11 12 13 14 15 03 10 Set the 36000 Display to Voltage by sending the following comman
41. means that the output status has changed and current limit events have occurred since the last LASer EVEnt query Lightwave COMMAND REFERENCE Command Reference LASer F lt nrf value gt COMMON FRONT PANEL DEVICE DEPENDENT Action Sets the output pulse frequency to be used in QCW Pulse mode or Hard Pulse mode Parameters One nrf value specifying the pulse frequency in the range of 1 1000 Hz Notes The frequency is adjustable only in the QCW Pulse mode or Hard Pulse mode QCW TRIG mode relies on external trigger inputs If the command is given while in QCW Trig mode the command will be accepted but no action will occur until the correct operational mode has been entered If the new value for command specific parameter forces the duty cycle or frequency beyond the operational range of the instrument the command specific parameter will be clamped to a minimum or maximum value that still allows operation You may query the command to determine if the setpoint was out of range Examples LAS F 150 action sets the QCW Pulse or Hard Pulse frequency to 150 Hz LASer F COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the output pulse frequency set in QCW Pulse or Hard Pulse mode Parameters None Notes The frequency may be read from any operational mode but is only applicable to output while in the QCW Pulse or Hard Pulse mode Examples LAS F response 260 means that the QCW Pulse or Hard Pulse frequency
42. operation may result in insulation meltdown and fire If there is a question regarding a cable s current carrying capacity call ILX Lightwave for resolution Lightwave LDX 36000 Series 17 SAFETY Laser Safety Laser Safety WARNING While the LDX 36000 Series Current Source is not a complete laser system the instruments are capable of driving high power Class IV lasers Because of this extreme care must be exercised during operation Only personnel familiar with the operation of high power lasers should operate these instruments A CAUTION DANGER AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION Lx WARNING THE ILX LDX 36000 SERIES CURRENT SOURCES ARE CAPABLE OF DRIVING CLASS IV LASERS WITH OUTPUT POWERS EXCEEDING 100 W ALWAYS WEAR PROPER EYE PROTECTION DURING OPERATION Optical Safety The unique properties of laser light create safety hazards not associated with conventional light sources The safe use of lasers requires that all users bystanders and anyone near the laser system be aware of the dangers involved This includes being familiar with the system and the properties of coherent intense beams of optical radiation WARNING Direct eye contact with the laser output will cause serious ocular damage and possible blindness Contact with skin and or clothing may result in burns High power lasers can ignite volatile substances such as alcohol acetone ether and other solvents as well
43. temperature measurement display is currently active 03_10 LDX 36000 Series 93 COMMAND REFERENCE Command Reference LASer ENABle COND lt nrf value gt FRONT PANEL DEVICE DEPENDENT Sets the Laser Condition Status Enable Register for summary in bit 3 of the Status Byte and generation of service requests An lt nrf value gt whose sum represents the enabled bits The sum of the enabled bits and must be a value between 0 and 65535 as detailed below Laser Condition Status Register LASer COND Logical Laser Condition Status Enable Register LAS ENABle COND lt nrf gt LAS ENABle C OND 00 Laser Current Limit 01 Laser Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 Error 05 Interlock 2 Error 06 Temp Sensor Open 07 Temp Sensor Shorted 08 Output On 09 Bad Steinhart Hart Conversion 10 Hardware Current Limit 11 AC Power Failure 12 Laser Open Circuit 2 13 Power Supply Failure 14 Power Supply Voltage Limit 15 Pass Element Power Limit Output On Bad Steinhart Hart Conversion Hardware Current Limit AC Power Failure Laser Open Circuit 2 Power Supply Failure Power Supply Voltage Limit Pass Element Power Limit Action Parameters Notes 1 2 4 8 16 32 64 128 Examples 947 LDX 36000 Series Laser Current Limit 256 Laser Voltage Limit 512 High Temperature Limit 1024 Laser Open Circuit 2048 In
44. the current output pulse is available from the front panel of the LDX 36000 Series instruments The TRIGGER OUT BNC connector is located next to the TRIGGER IN connector on the front panel This output can be used to synchronize or time measurement or control events in other instrumentation or devices This signal is active whenever the output of the instrument is enabled and when any of the pulse modes of operation are selected An adjustable delay is available to control the timing or start of the trigger output pulse The trigger output will be offset or delayed by the delay time in seconds The delay time is from the start or rising edge of the current output pulse to the start or rising edge of the trigger output pulse The delay time can be programmed with a GPIB command LAS DELAY OUT and is adjustable from zero delay to 1 second with an adjustment resolution in microseconds See Chapter 5 for a more detailed description of this command LDX 36000 Series 45 OPERATION f Front Panel Operation Saving and Recalling from the Front Panel For applications where several different instrument configurations may be required for different types of testing the LDX 36000 Series High Power Current Sources offer a useful Save and Recall feature The SAVE feature allows all front panel settings for a given instrument configuration to be easily stored for future use These settings which are stored in one of ten memory locations can be retrieved
45. thermal grease and a clamping arrangement for temporary connection This will provide the most accurate temperature measurement Note The instrument measures forward voltage photodiode current and temperature in CW and QCW modes QCW mode measurement accuracy is achieved by measuring in the last 15 us of the pulse and throughout the pulse at pulse widths gt 1ms 03_10 LDX 36000 Series 29 30 OPERATION Front Panel Operation Front Panel Operation This section describes the fundamentals of operation for the LDX 36000 Series High Power Laser Current Source The order of descriptions will follow the normal progression of how one would typically configure the instrument for use for the first time Each operational mode CW and QCW will be described in its own section The Adjust Knob The Adjust knob shown in Figure 3 4 is used to adjust and set the various operational parameters of the instrument Depending on the parameter being adjusted changes will either occur immediately upon rotation of the knob or after either the Adjust or Set button is pressed Display 1 888 C3 CURRENT LIMIT C3 VOLTAGE LIMIT DISPLAY 1 88 REMOTE TALK LISTE AL DISPLAY Figure 3 6 Display 1 Figure 3 5 Adjust Knob The left hand display labeled Display 1 shown in Figure 3 5 is used to show the laser c
46. with an oscilloscope This output is active when the instrument is in QCW pulse or hard pulse modes It is a digital representation of the pulse state The TTL pulse is stretched by 4 us to compensate for actual analog pulse width asymmetry of rise and fall time Trigger In The LDX 36000 Series instruments accept a TTL level input signal to initiate an output current pulse The TRIGGER IN BNC connector is located to the right of center on the front panel The leading edge of this signal is used to initiate an output pulse the repetition interval is determined by the rate of the TTL signal at the TRIGGER IN connector Pulse width and amplitude are controlled by the instrument and are programmable from the front panel or through the GPIB interface The instrument must be in QCW TRIG mode in order to control the output pulse with a trigger input See QCW Trig Mode earlier in this chapter An adjustable delay is available to synchronize or control the timing of the instrument s output pulse with other instruments or devices The output pulse will be offset or delayed by the delay time in seconds The offset is from the start or rising edge of the output pulse The delay time can be programmed with the GPIB command LAS DELAY IN and is adjustable from 20 microseconds delay to one second with an adjustment resolution in microseconds See Chapter 5 for a more detailed description of this command Trigger Out A TTL level signal output synchronized with
47. zero characters in length Notes The message may contain any ASCII character but will be terminated when a NULL terminator character is received If the message has less than 16 bytes the firmware will fill the remaining message space with the space character After 16 bytes have been entered the firmware will null terminate the string Examples Mes THIS IS A TEST action The string THIS IS A TEST will be stored in non volatile memory MES Test 3 action The string Test 3 Will be stored in non volatile memory MESsage DEVICE DEPENDENT Action Returns a previously stored message from non volatile memory The message will always be 16 bytes in length and enclosed in quotes The message is entered via the MESsage command Parameters None Notes The response data will be a 16 byte long string If there is no previously stored message the response will be all spaces Examples MES response Test 3 means the previously stored message was Test 3 MES response THIS IS A TEST means the previously stored message was THIS IS A TEST OPC COMMON Operation Complete FRONT PANE Action Sets the Operation Complete Bit in the Event Status Register when all pending overlapped commands have been completed Parameters None Notes See the IEEE 488 2 specification for additional information Examples OPC 1147 LDX 36000 Series Lightwave 03 10 COMMAND REFERENCE Command Reference
48. 0 Series High Power Laser Diode Current Source This reference contains useful information for both local and remote operation of the LDX 36000 CLS Common Action Clears status event registers Event Status Event Status Enable and Error Queue Notes Useful to clear registers before enabling service requests SRQ Example CLS DELAY nrf value DEVICE DEPENDENT Action Causes the execution of commands to be delayed by a user specified time This command is similar to the WAI common command except that execution resumes after the specified number of milliseconds instead of waiting for the Operation Complete flag to be set Parameters nrf value which represents the delay time in milliseconds with a range of 0 to 65535 Notes The Operation Complete flag is held false until the delay period elapses but the OPC Query will not execute until the delay period has elapsed This command is useful for creating delays which do not require a lot of program code and will not tie up the GPIB bus during execution The delay time is approximate with an error of 10 Care should be taken to set the GPIB time out appropriately for use with the Delay command After this command or the WAI command is sent the 36000 Series current source may receive up to 20 more commands before the delay period is over If more than 20 commands are sent before the delay or wait period is over the additional commands will be ignored and an
49. 0 us Duty cycle query returns a value of 9 5 1127 LDX 36000 Series uix Lightwave 03 10 COMMAND REFERENCE Command Reference LASer PWP lt nrf value gt Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Specifies the constant duty cycle QCW pulsewidth An lt nrf value gt specifying the output current pulsewidth in seconds When the pulsewidth is specified using the LAS PW command the output frequency will change as required to maintain constant duty cycle If the new value for command specific parameter forces the duty cycle or frequency beyond the operational range of the instrument the command specific parameter will be clamped to a minimum or maximum value that still allows operation You may query the command to determine if the setpoint was out of range Changing the pulsewidth is only effective when the instrument is in either QCW Pulse QCW Trig or Hard Pulse modes If an attempt to change pulsewidth is made in any other mode the command will be ignored LAS MODE PULSE LAS DC 5 5 LAS PWP 95e 3 LAS F action places instrument in QCW Pulse mode with a duty cycle of 5 596 and a pulsewidth of 950 us Frequency query returns a value of 58 Hz LASer STEP nrf value DEVICE DEPENDENT Action Increments and decrements selected laser control mode setpoint by the given amount when used with the LAS INC or LAS DEC command Parameters nrf value specifying the step
50. 00 0 001 to 100 00 0 001 to 100 00 0 001 to 100 00 Resolution mA W 001 001 001 001 001 Power Control Range Range 0 to 1000W 0 to 1000W 0 to 1000W 0 to 1000W 0 to 1000W Resolution 1W 1W 1W 1W 1W P1 Slope Efficiency Range W A 0 00 to 10 00 0 00 to 10 00 0 00 to 10 00 0 00 to 10 00 0 00 to 10 00 Resolution W A 0 01 0 01 0 01 0 01 0 01 P2 Threshold Range W A 0 00 to 10 00 0 00 to 25 00 0 00 to 50 00 0 00 to 85 00 0 00 to 125 00 Resolution W A 0 01 0 01 0 1 0 1 0 1 Temperature Sensor Type 10K Thermistor Range 0 to 199 9 C Thermistor Current 100 pA 100 pA 100 pA 100 pA 100 pA Accuracy 40 2 9C LASER DIODE PROTECTION Output shorting relay normally closed 2s turn on delay per 21CFR 1040 10 Hardware Fault Response Time Current Limit 2 us Open Circuit 50 us Intermittent contact protection 03 10 LDX 36000 Series 9 Specifications INTRODUCTION AND SPECIFICATIONS Table 1 2 LDX 36000 Series Specifications Continued Sheet 4 of 8 36010 12 36025 12 36050 12 36085 12 36125 12 AC power failure brown out detection error monitoring and reporting Transient protection output on off power up down EFT surge 1000V Adjustable current and voltage limit redundant hardware current and voltage limit INTERLOCKS Interlock 1 No
51. 2 and C3 These constants will change depending on the thermistor used in terms of 32 LDX 36000 Series Lightwave OPERATION Front Panel Operation thermistor resistance at 25 C manufacturer and the measurement accuracy required The factory default configuration for the temperature measurement circuit is for it to be disabled This is done by setting the three thermistor calibration constants C1 C2 and C3 to zero Doing this disables the temperature display on the front panel and also prevents the output from being disabled due to an open or shorted thermistor circuit In order to use the temperature measurement feature of the LDX 36000 nonzero values for the Steinhart Hart constants must be entered Using an uncalibrated ILX Lightwave 10 kQ 25 C thermistor the typical values shown in Table 3 3 may be entered to give a measurement accuracy of approximately 2 C If higher accuracy is required a calibrated thermistor must be used Table 3 3 Typical 10 25 C Thermistor Calibration Values C1 1 125 10 3 C2 2 347 x10 C3 0 855 x1077 To display temperature being meaured the T button within the Display 2 Adjust box must be pressed See Figure 3 6 03_10 LDX 36000 Series 33 OPERATION _ Front Panel Operation PARAMETER If the temperature measurement circuit is to be used the thermistor constants must be changed from their default values This may be done either from the
52. A 32 64 128 Examples 100 LDX 36000 Series Laser Event Status Register LASer EVEnt 19 Logical E OR Laser Current Limit Laser Event Status Enable Register LAS ENABIe EVEnt gt LAS ENABle EVEnt Laser Voltage Limit High Temperature Limit Laser Open Circuit Interlock 1 State Change Interlock 2 State Change Temp Sensor Open Temp Sensor Shorted 7 8 5 4 3 2 1 94 256 512 1024 2048 4096 8192 16384 32768 COMMON FRONT PANEL DEVICE DEPENDENT 00 Laser Current Limit 01 Laser Voltage Limit 02 High Temperature Limit 03 Laser Open Circuit 04 Interlock 1 State Change 05 Interlock 2 State Change 06 Temp Sensor Open 07 Temp Sensor Shorted 08 Output On 09 Bad Steinhart Hart Conversion 10 Hardware Current Limit 11 AC Power Failure 12 Laser Open Circuit 2 13 Power Supply Failure 14 Power Supply Voltage Limit 15 Pass Element Power Limit Output On Bad Steinhart Hart Conversion Hardware Current Limit AC Power Failure Laser Open Circuit 2 Power Supply Failure Power Supply Voltage Limit Pass Element Power Limit The enabled or disabled events can be set via the LASer ENABle EVEnt command The event status is only cleared when the event status is read or by the CLS command while the condition status LAS COND is constantly changing LAS EVE response 257
53. AL LDI slope offsetDacCounts 12 Set the current setpoint to 50 of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps 13 Record the value of current measured by the current transducer 14 Verify that the current setpoint is within the accuracy specifications of the instrument 126 LDX 36000 Series Lightwave CALIBRATION AND TROUBLESHOOTING OCW Calibration QCW Calibration Oo 10 11 12 13 14 15 16 17 03 10 Set the 36000 output mode to QCW Pulse with the following GPIB command LAS MODE PULSE Set the QCW current calibration to default values by sending the following command LAS CAL QCWLDI 1 0 Use a shorted output cable to connect the 36000 current output to a high accuracy current transducer Set the current limit to the maximum value for the instrument Set the duty cycle to 1 by using the following command LAS DC 0 01 Set the pulse width to 1ms by using the following command LAS PWP 0 001 Set the current setpoint to 20 of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps Turn the 36000 current output on with the following command LAS OUT ON Use the trigger out from the 36000 to trigger a measurement from the current transducer Record the value of current measured by the current transducer Set the current setpoint to 80
54. AND REFERENCE Command Reference RCL lt nrf value gt E Recall RONT PAN Action Recalls a stored setup configuration from memory Parameters nrf value with a value from 0 10 Notes Configuration 0 is the factory set default configuration If Configuration 0 is recalled via GPIB the instrument will be in Remote mode If it is recalled from the font panel the instrument will be in Local mode The SAV function is used to save configurations for convenient recall The current setup is automatically stored and recalled at the next power on unless PSC is used to enable the power on status clear flag Examples RCL 0 response instrument is reconfigured to factory default settings RST COMMON Reset indi EVICE DEPENDENT Action Performs a device reset and sets the OCIS and OQIS states Parameters None Notes OCIS Operation complete Command Idle State This is the same as after OPC no further operations to complete OQIS Operation complete Query Idle State This is the same as after OPC no further operations to complete These states allow the instrument to complete its reset process no operations pending before continuing with other operations Examples RST SAV nrf value COMMON Save do anie EVICE Action Saves the current instrument configuration to non volatile memory Parameters nrf value with a value from 1 10 Notes Configuration 0 is reserved for the factory set
55. B controllers This termination will be sent with all output until the TERM 0 command is sent or the instrument is turned off Term 1 action temporarily sets CR NL END as the output terminator Term 0 action returns output terminator to NL END TERM Action Parameters Notes Examples 120 LDX 36000 Series DEVICE DEPENDENT Returns whether or not a carriage return has been added to the GPIB terminator None An altered terminator will be in the form lt CR gt lt NL gt lt END gt This termination will be sent with all output until the TERM 0 command is sent or the instrument is turned off Term response 1 the output terminator has been temporarily set to lt CR gt lt NL gt lt END gt Term response 0 the output terminator is the IEEE 488 2 standard lt NL gt lt END gt Lightwave 03 10 COMMAND REFERENCE Command Reference TIME DEVICE DEPENDENT Action Returns the amount of time since the LDX 36000 was last powered up Parameters None Notes The TIME and TIMER clocks are independent from each other Examples Time response 0 00 31 73 means 31 73 seconds have elapsed since the instrument was turned on TIMER DEVICE DEPENDENT Action Returns the amount of time since the last TIMER query Parameters None Notes The TIME and TIMER clocks are independent from each other Examples Timer response 0 02 56 34 means 2 minutes 56 34 sec
56. E 126 will be generated LAS CALT 1 234 1 324 1 234 action Sets C1 to 1 234 C2 to 1 324 and C3 to 1 234 LAS CALT 0 0 0 action Sets all three constants to zero and disables temperature measurement LASer CALT Action Parameters Notes Examples LDX 36000 Series FRONT PANEL DEVICE DEPENDENT Returns the values of the Steinhart Hart equation constants for temperature measurement None The default value for each constant are the typical values for an uncalibrated 10kQ thermistor shown below When all three constants are zero the temperature display is disabled and the open sensor and temperature limit error LEDs are disabled and will not disable the output Typical values to use for an ILX Lightwave uncalibrated 10 kQ thermistor are C1 1 125 10 3 C2 2 347 x10 0 855 x107 LAS CALT response 1 125 2 347 0 855 means C1 1 125 C2 2 347 and C3 0 855 Lightwave COMMAND REFERENCE Command Reference LASer COND COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the value of the Laser Condition Status Register Parameters None Notes Response is the sum of the enabled bits and must be a value between 0 and 65535 as detailed below Laser Condition Status Register LASer COND 5 2 10 9 s 7 6 5 4 3 2 1 00 Laser Current Limit n 01 Laser Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 Error
57. LDV NONE Turns onDisplay 1 to show laser voltage LAS DIS LDV NONE Returns on off status of the laser voltage display LDX 36000 Series 67 5 COMMAND REFERENCE Remote Command Reference Summary Table 5 1 Remote Command Summary Reference List Continued Sheet 3 of 5 Name Parameters Function LAS DIS P NONE Turns on Display 1 to show laser output current in terms of optical output power Must have previously entered laser threshold and slope efficiency LAS CALP for this command to function LAS DIS P NONE Returns on off status of the laser optical output power display LAS DIS PPD NONE Turns on Display 1 to show measured optical power or photocurrent from external photodiode LAS DIS PPD NONE Returns on off status of the external photodiode display LAS DIS PWF NONE Turns on Display 2 to show pulsewidth setpoint when in constant frequency mode LAS DIS PWF NONE Returns on off status of the pulsewidth constant frequency display LAS DIS PWP NONE Turns on Display 2 to show pulsewidth setpoint when in constant duty cycle mode LAS DIS PWP NONE Returns on off status of the pulsewidth constant duty cycle display LAS DIS T NONE Turns on Display 2 to show measured temperature LAS DIS T NONE Returns on off status of temperat
58. LX Lightwave Customer Service for additional help im iLX Lightwave LDX 36000 Series 123 CALIBRATION AND TROUBLESHOOTING Calibration Overview Calibration Overview ILX Lightwave recommends sending your LDX 36000 High Power Current Source into our facilities for calibration Our facilities are set up to properly calibrate the LDX 36000 quickly and efficiently by trained technicians However if necessary the instrument can also be calibrated by following this guide Several calibrations are required to fully calibrate the LDX 36000 High Power Current Source These calibrations include output current setpoint calibration forward voltage measurement calibration photodiode current measurement calibration and thermistor measurement calibration The output current limit and voltage limit are calibrated internally by the instrument as part of the calibration process The instrument should be calibrated every twelve months or whenever performance verification indicates that calibration is necessary Calibrations should occur under stable environmental conditions usually 23 C 1 C with relative humidity in the range of 20 50 When necessary the LDX 36000 may be calibrated at its intended operating temperature as long as it is within the specified operating temperature range of 0 40 C Finally the LDX 36000 Series High Power Laser Current Source should be allowed to warm up with the output on a minimum of one hour prior to cal
59. Pass Element Power Limit Figure 4 7 Laser Output Off Register 00 Disabled 08 Disabled 01 Enabled 09 Disabled 02 Enabled 10 Enabled 03 Enabled 11 Enabled 04 Enabled 12 Enabled 05 Enabled 13 Enabled 06 Disabled 14 Enabled 07 Disabled 15 Enabled LDX 36000 Series Lightwave REMOTE OPERATION Command Timing Command Timing This section describes for each device dependent command whether that command is performed in an overlapped or sequential manner In other words it states whether the next command may begin while the first is being executed or if it must wait until the first command is completed before its execution begins See the Operation Complete Definition earlier in this chapter for conditions about setting the operation complete flag Sequential Overlapped Commands All device dependent commands are executed in an overlapped manner subsequent commands may begin before the current command has completed Some common commands are sequential the next command must wait until this command has completed All device dependent commands are executed in an overlapped manner except the DELAY command which is sequential The operation complete flag is set after the conditions outlined in the Operation Complete Definition have been satisfied WAI common command is an example of a sequential command which forces the next command t
60. Pass Element Power Limit Logical OR ree ee LAS ENABle OUT OFF 1 Laser Current Limit 1256 Output On 2 Laser Voltage Limit 512 Bad Steinhart Hart Conversion 4 High Temperature Limit 1024 Hardware Current Limit 8 Laser Open Circuit 2048 AC Power Failure 16 Interlock 1 Open 4096 Laser Open Circuit 2 32 Interlock 2 Open 8192 Power Supply Failure 64 Temp Sensor Open 16384 Power Supply Voltage Limit 128 Temp Sensor Shorted 32768 Pass Element Power Limit The enabled or disabled events can be set via the LASer ENABIe OUTOFF command The output status can be monitored by using the LASer EVEnt query The factory default value for this register is B1111110000111110 or HFC3E or 64574 decimal Bits marked by asterisks are permanently enabled and cannot be changed Bits marked with a dagger 1 are permanently disabled and cannot be changed Examples LAS ENAB OUTOFF response 1086 means that either the laser voltage limit high temperature limit laser open circuit the opening of interlocks 1 or 2 or the hardware current limit will force the laser output off 03 10 LDX 36000Series 99 COMMAND REFERENCE Command Reference LASer EVEnt Action Parameters Notes Returns the value of the Status Event Register None The response is the sum of the enabled bits and must be a value between 0 and 65535 as detailed below o
61. Point 20 0 20 0 NR2 Scientific Notation 2 0E 1 2 0e 1 2 0E 1 2 0e 1 NR3 For more information on these definitions refer to the IEEE 488 2 standard There are no default values for omitted parameters If a command is expecting a parameter and nothing is entered an error is generated For further clarity in programming the Boolean values of one 1 and zero 0 may be used or their names as indicated below Table 4 5 Substitute Parameter Values Substitute Name Value ON 1 OFF 0 OLD 1 NEW 0 TRUE 1 FALSE 0 SET 1 RESET 0 If multiple parameters are expected they should be separated by commas For example to set the Steinhart Hart constants for temperature measurement C1 C2 and the following command could be sent LAS CALT 1 111 2 004 0 456 All parameters of a multi parameter command must be entered even if only some of them need to be changed For example LAS CALT 1 111 0 456 will generate an error The second parameter must be included LDX 36000 Series 53 REMOTE OPERATION Command Syntax A query has no space between the mnemonic and the question mark as in LAS LDI Command Tree Structure The LDX 36000 Series current source device dependent commands are structured in a tree format as shown in Figure 4 4 Each of the legal paths is shown followed by its list of path options followed by the commands themselves It is recommended t
62. S CALP 0 63 1 75 LAS DIS P LAS P 1 25 action enters laser threshold of 1 75 A and slope efficiency of 0 63 W A before changing display to show optical power output and automatically setting output current to 3 7 A current required to generate 1 25 W output LASer PDBIAS nrf value Action Parameters Notes Examples LDX 36000 Series FRONT PANEL DEVICE DEPENDENT Sets the reverse bias voltage on an external photodiode connected to pins 1 and 2 of the 9 pin sense connector An nrf value specifying the reverse voltage in volts ranging from 0 0 to 15 0 The reverse bias on a photodetector results in a more linear response of current output vs light input and is recommended for best performance when generating L I data The photodiode reverse bias is set either from the front panel or via GPIB LAS PDBIAS 10 1 action a voltage of 10 1V is set on the photodiode cathode with respect to the anode Lightwave COMMAND REFERENCE Command Reference LASer PDBIAS COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the value of the reverse bias voltage setting Parameters None Notes The photodiode reverse bias voltage measurement can be displayed on the front panel Display1 See Chapter 3 for more information Examples LAS PDBIAS response 10 1 a reverse bias of 10 1V is measured LASer Power Common FRONT PANEL DEVICE DEPENDENT Action Returns the output optical power set
63. S LIV SET 0 7 0 01 0 001 LAS LIV OUTPUT ON action the start current is set to OA the stop current is set to 7A the step current is set to 0 01A the delay time in each step is 1 ms and the output is enabled las liv output 0 action LIV output is disabled LASer LIV OUTPUT COMMON FRONT PANEL DEVICE DEPENDENT Action Returns status of LIV output Parameters None Notes None Examples LAS LIV OUT response 0 meaning the LIV output has been disabled 03 10 LDX 36000 Series 7 107 COMMAND REFERENCE Command Reference LASer MODE e FRONT PANEL DEVICE DEPENDENT Action Returns the selected laser output mode Parameters None Notes The response is the same as the labels of the illuminated mode LEDs Examples LAS MODE response CW means the output mode is CW CW LED is illuminated in the mode box on the front panel along with the CW LED in the CW Mode box Las Mode response TRIG means the output mode is QCW Trig the QCW LED is illuminated in the Mode box on the front panel along with the Trig LED in the QCW Mode box LASer MODE CW COMMO FRONT PANEL DEVICE DEPENDENT Action Places the LDX 36000 in CW output mode Parameters None Notes If the output was enabled when the command is given the output will be disabled prior to changing modes If the command is given when the instrument is already in the specified mode output will be disabled Examples LAS MODE CW
64. S PDBIAS NONE Returns PD bias reverse voltage value in volts LAS PPD NONE Returns monitor photodiode power value or photocurrent if responsivity value is not entered LAS PW NONE Returns current pulsewidth value LAS PWF 1 Sets pulsewidth while holding frequency constant duty cycle percentage will change LAS PWP 1 Sets pulsewidth while holding duty cycle percentage constant frequency will change R NONE Returns thermistor resistance measurement T NONE Returns current temperature measurement LDX 36000 Series 59 REMOTE OPERATION Status Reporting Status Reporting This section contains information that is relevant for understanding instrument error and status reporting It also contains information regarding the use of the instrument status for generating interrupts for interrupt driven programs or subroutines Understanding the Operation Complete definition for the instrument is useful for program synchronization The Output Off Register section also contains information on configuring the conditions which force the laser current source output off Event Condition Registers In addition to the required IEEE 488 2 status reporting structure the LDX 36000 remote interface provides Event and Conditions Registers for laser controller operations The Event Registers are used to report events which occur during the operation of the LDX 36000 Series High Power Laser Diode Current Source Events differ from condi
65. Status Byte Query RONT P Action Returns the value of the Status Byte Register Parameters None Notes The response is the sum of the enabled bits and must be a value between 0 and 256 Refer to Figure 4 6 in Chapter 4 for a complete description of the Status Byte and Service Request Enable Register Examples STB response 200 specifies that the laser condition summary master status summary and error available bits are enabled 03 10 LDX 36000 Series 119 COMMAND REFERENCE Command Reference Temperature DEVICE DEPENDENT Action Returns the measured temperature in C Parameters None Notes Temperature measurement must be enabled by setting all three Steinhart Hart thermistor constants to nonzero values before this query may be used If temperature is queried while measurement is disabled the last valid temperature measurement will be returned Examples T response 27 5 means the measured laser temperature is 27 5 C TERM nrf value Action Parameters Notes Examples DEVICE DEPENDENT Specifies the terminator to be used in GPIB communications One Boolean nrf value specifying whether or not a carriage return CR will be added to the GPIB terminator 0 FALSE non zero TRUE An altered terminator will be in the form lt CR gt lt NL gt lt END gt This technically takes the LDX 36000 out of the IEEE 488 2 specification but may be done for convenience when using non standard GPI
66. TION warrants this instrument to be free from defects in material and workmanship for a period of one year from date of 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 the original packing container with at least inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warran
67. Table 4 4 53 Table 4 5 Substitute Parameter 53 Table 4 6 Invalid Syntax Command 05 55 Table 4 7 LDX 36000 IEEE Common Commands 57 Table 4 8 LDX 36000 Commonly Used Commands 58 Table 4 9 Default Output Off Register Settings 62 Table 5 1 Remote Command Summary Reference List 66 Table 6 1 Symptoms and Corrective Actions 133 Table 6 2 Error Code 135 Table 6 3 Error Messages 136 03 10 LDX 36000Series vii L DON viii LDX 36000 Series Lightwave SAFETY AND WARRANTY INFORMATION 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 A CAUTION Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment AA warnine Warning indicates a potenti
68. The sum of the enabled bits and must be a value between 0 and 65535 as described below Laser Output Off Register 5 4 Ei 1101918 6 5 4 2 110 00 Laser Current Limit 01 Laser Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 Open 05 Interlock 2 Open 06 Open Temp Sensor 07 Temp Sensor Shorted 08 Output Enabled 09 Bad S H Conversion 10 HW Current Limit 11 AC Power Failure 12 Laser Open Circuit 2 13 Power Supply Failure 14 Power Supply Voltage Limit 15 Pass Element Power Limit Logical OR pols e 7 e s 4 3 2 1 0 Laser Output Off Enable Register LAS ENABle OUT OFF lt nrf gt LAS ENABle OUT OFF Turn Output Off Laser Current Limit 1256 Output Enabled Laser Voltage Limit 512 Steinhart Hart Conversion High Temperature Limit 1024 Hardware Current Limit Laser Open Circuit 2048 AC Power Failure Interlock 1 Open 4096 Laser Open Circuit 2 Interlock 2 Open 8192 Power Supply Failure Temp Sensor Open 16384 Power Supply Voltage Limit Temp Sensor Shorted 32768 Pass Element Power Limit Bits marked with an asterisk are permanently enabled and cannot be changed Bits marked with a dagger 1 are permanently disabled and cannot be changed The enabled or disabled conditions can be read via the LASer ENABle OUTOFF query The enable r
69. act to two contact adapter with the grounding wire connected to an electrical ground safety ground The AC input and supplied power cable meets IEC safety standards AC Power Requirements The LDX 36000 Series Current Sources may be operated from a single phase power source delivering nominal line voltages in the range of 100 to 240 VAC 10 all values RMS from 50 to 60 Hz Please refer to specifications for proper line voltage for your instrument The internal power supplies are autoranging so no reconfiguration is necessary to operate at different input voltages Maximum power consumption depends on the model warnine Before connecting the LDX 36000 Current Source to a power source verify that the AC power source is within the voltage range printed on the instrument s rear panel To avoid electrical shock hazard connect the instrument to properly earth grounded electrical receptacles only Failure to observe this precaution may result in severe injury or death GPIB Communications The IEEE 488 GPIB interface connector is located on the rear panel in the upper left hand side of the panel as shown in Figure 1 2 Attach a GPIB cable to the 24 pin connector The connectors are polarized to ensure proper orientation Finger tighten the two jack screws on either side of the connector to prevent the cable from inadvertently becoming disconnected Lightwave INTRODUCTION AND SPECIFICATIONS Installation A total of 15 d
70. ain changes Display 1 to P2 while showing a threshold value of Amps in Display 2 This value is adjusted in identical fashion by pressing the Parameter Set button and then turning the Adjust knob The value will be saved in nonvolatile RAM after a three second timeout Once slope and threshold values have been correctly entered and the instrument placed in Optical Power mode rotating the Adjust knob clockwise from zero will start to increase the laser drive current and cause Display 1 to indicate LO xx where xx is the percentage of threshold value and increases from 00 to 99 while below threshold Once the laser current setpoint has exceeded threshold Display 1 will indicate calculated optical power If the threshold P2 is set to 0 0 the power mode is considered to be uncalibrated and Display 1 will show when power mode is selected 42 LDX 36000 Series Lightwave 03 10 OPERATION Front Panel Operation Configuring External Photodiode Power Measurements If a photodiode is connected to the instrument the instrument will measure optical power in terms of either photocurrent in or optical power in Watts Pressing the DISPLAY 1 P PPD button until the Display 1 enunciator W PD is illuminated allows for measurement of optical power via an external photodiode Note Display 1 will indicate power in Watts only when the photodiode responsivity value is nonzero The photodiode responsivity CAL PD is used to
71. ale Slowly increase the voltage on the adjustable voltage source until the voltage limit light is triggered Verify that the voltage limit is triggered within the accuracy specifications of the instrument LDX 36000 Series 129 Photo CALIBRATION AND TROUBLESHOOTING Photodiode Current PDI Measurement diode Current PDI Measurement To perform an accurate photodiode calibration large resistor values are recommended 1 10 11 12 13 130 LDX 36000 Series Set the 36000 display to Power Photodiode by sending the following command LAS DIS PPD Set the PD Bias to 0 Volts by sending the following command LASER PDBIAS 0 Set the user photodiode calibration to 0 by sending the following command LAS CALPD 0 Set the factory photodiode calibration to default values by sending the following command LAS CAL MDI 1 0 Connect a current source to the photodiode input pins in the DB9 connector on the back of the 36000 Set the current source to 2096 of full scale 2 mA Record the 36000 s photodiode current measurement with the following command LAS PPD Set the current source current to 80 of full scale 8 mA Record the 36000 s photodiode current measurement with the following command LAS PPD Calculate the slope and offset of the photodiode current measurement with the following equations slope 80 Setpoint Current Value 20 Setpoint Current Value 36000 80 measurement 36000 20 measu
72. ally dangerous situation which can result in serious injury or death WARNING Visible and or invisible laser radiation Avoid eye or skin exposure to direct or scattered radiation General Safety Considerations If any of the following conditions exist or are suspected do not use the instrument until safe operation can be verified by trained service personnel Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the instrument to ILX Lightwave or the authorized local ILX Lightwave distributor for service or repair to ensure that safety features are maintained see the contact information on page xiv 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 xii for more information Lightwave LDX 36000 Series ix Ld 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 moi
73. alue DEVICE DEPENDENT Action Enters the slope and offset calibration constants for photodiode current measurement Parameters Two nrf values The first parameter is the setpoint slope and the second is the setpoint offset Notes This command allows for calibration and linearization of the photodiode current measurement The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal mdi 1 004874 0 049776 action Adjusts the internal A D calibration to linearize the voltage limit by entering a new slope and offset of 1 004874 and 0 049776 respectively Las Cal MDI 1 0 0 0 action Resets the photocurrent measurement calibration constants to default values LASer CAL MDI DEVICE DEPENDENT Action Returns the current photodiode current measurement calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal mdi response 1 0 0 0 meaning a slope of 1 0 and an offset of 0 0 had been previously entered as part of the calibration process LASer CAL THERMI lt nrf value gt lt nrf value gt DEVICE DEPENDENT Action Enters the slope and offset calibration constants for thermistor current Para
74. ce E 599 Error No current measured by the instrument s internal measurement circuits indicates an open circuit This condition can be caused by an intermittent contact or fully open circuit 03_10 LDX 36000 Series 137 CALIBRATION AND TROUBLESHOOTING Error Messages 138 LDX 36000 Series Lightwave APPENDIX A ALLOWED OCW SPACE ie B a a 21 El L Ei Bl This Appendix illustrates the relationships of pulse frequency versus duty cycle for several different pulsewidth values This information should be used as a guide to the user so they may properly configure their required QCW parameters Lightwave LDX 36000 Series 139 Allowed QCW Operating Region ALLOWED OCW SPACE Allowed QCW Operating Region 0 Ang XI INN Figure A 1 Allowed QCW Operating Region LI LI Lu J j es DOMMOHPSI EET pA Loft ee HHH a 3 SE ET al uM Emm UNES j eee Ll 7 a a E pL 5 l LE 22 24 a a o_o sss SS ee SS SS SSS 0 Er eee a SG 7 a 2 a ETT annm 0001 LI t gl 1
75. current setpoint LAS LDI NONE Returns the current laser setpoint LAS LDV NONE Returns the currently measured laser forward voltage LAS LIM I 1 Sets the laser current limit LAS LIM 1 NONE Returns the laser current limit LAS LIM T 1 Sets the laser temperature limit LAS LIM T NONE Returns the laser temperature limit LAS LIM V 1 Sets the laser compliance voltage limit LAS MODE NONE Returns the current output mode of the instrument LAS MODE CW NONE Sets the output mode to CW LAS MODE HPULSE NONE Sets the output mode to hard pulse mode LAS MODE PULSE NONE Sets the output mode to pulsed LDX 36000 Series Lightwave 03 10 REMOTE OPERATION LDX 36000 Commonly Used Commands Table 4 8 LDX 36000 Commonly Used Commands Continued Sheet 2 of 2 Command Parameters Function LAS MODE TRIG NONE Sets the output mode to pulsed output is initiated by an external trigger signal LAS OUT 1 Enables disables current source output LAS OUT NONE Returns current source output status LAS P 1 Sets output current setpoint in terms of input optical power based on threshold and slope efficiency values LAS P NONE Returns output current setpoint in terms of optical power based on threshold and slope efficiency values LAS PDBIAS 1 Sets the reverse bias voltage 0 to 15 V on an external photodiode connected to pins 1 and 2 of the sense 9 pin connector LA
76. d LAS DIS V Set the voltage calibration to default values by sending the following command LAS CAL LDV 1 0 Connect an adjustable voltage source to the laser diode voltage sense lines located in the DB9 on the back panel of the 36000 Connect a DMM to measure the output of the voltage source Set the adjustable voltage source to OV Set the 36000 voltage limit to 2096 of the max voltage limit with the following command LAS LIM V limit where limit is the voltage limit value in volts Slowly increment the voltage on the adjustable voltage source until the voltage limit light is triggered Record the voltage at which the voltage limit is triggered Set the 36000 voltage limit to 8096 of the max voltage limit with the following command LAS LIM V limit where limit is the voltage limit value in volts Slowly increment the voltage on the adjustable voltage source until the voltage limit light is triggered Record the voltage at which the voltage limit is triggered Calculate the slope and offset of the voltage limit calibration with the following equations slope 80 Voltage Limit Value 20 Voltage Limit Value 36000 80 Trigger Value 36000 20 Trigger Value offset 80 Voltage Limit Value slope 36000 80 Trigger Value Send the voltage limit calibration to the 36000 using the following command LAS CAL LIMITV slope offset Set the adjustable voltage source to OV Set the 36000 voltage limit to 5096 of full sc
77. d delay time to 3 ms LASer LIV SET Action Parameters Notes Examples LDX 36000 Series DEVICE DEPENDENT Returns the start current in Amps stop current in Amps step current in Amps and delay time in seconds for fast LIV mode None The command allows the customer to check the parameters for the fast LIV mode The customer should make sure that the stop current is greater than the start current the step current is at least 0 01A and the number of LIV points is not more than 1000 LAS LIV SET response 3 0 12 0 0 5 0 02 means the start current is 3 0A the stop current is 12 0A the step current is 0 5A and the delay time is 20 ms Lightwave COMMAND REFERENCE Command Reference LASer LIV OUTPUT lt nrf value gt Con FR DEVICE DEPENDENT ONT PANEL Action Enables or disables fast LIV current source output Parameters nrf value 1 on 0 off Notes There is a short delay between the LIV output is enabled and the shorting relay is opened Current quickly ramps up from the start current to the stop current The basic ramping time without setting the delay time for each step is 10 ms for CW The basic ramping time for each step is dependent on the pulse width and duty cycle in QCW The fast LIV current source output will automatically be turned off when the stop current is reached The customer can also choose to turn off the fast LIV in the middle of the LIV running Examples LA
78. default configuration It is normally not necessary to save the current setup for next power on The current setup is automatically stored for recall at next power on unless the PSC command is used to clear the power on status Examples SAV 3 response the current instrument configuration is stored in memory location 3 1187 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference SECURE lt nrf value gt DEVICE DEPENDENT Action Allows to access to protected user data For factory use only SRE lt nrf value gt COMMON Service Request Enable Action Enables bits in the Service Request Enable Register Parameters nrf value whose sum represents the enabled bits Notes Refer to Figure 4 6 in Chapter 4 for a complete description of the Status Byte and Service Request Enable Register Examples SRE 136 action enables the service request enable register when a laser condition summary or an error is available SRE COMMON Service Request Enable Query RONT PAN Action Returns the enabled bits in the Service Request Enable Register Parameters None Notes The response is the sum of the enabled bits and must be a value between 0 and 256 Refer to Figure 4 6 in Chapter 4 for a complete description of the Status Byte and Service Request Enable Register Examples SRE response 136 specifies that the laser condition summary and error available bits are enabled STB COMMON
79. e Frequency Range 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1 to 1000 Hz 0 1 to 1000 Hz Resolution 0 1 Hz 0 1 Hz 0 1 Hz 0 1 Hz 0 1 Hz Accuracy 0 1 0 1 0 1 0 1 0 1 03 10 LDX 36000 Series E EM INTRODUCTION AND SPECIFICATIONS CHAPTER Specifications Table 1 2 LDX 36000 Series Specifications Continued Sheet 2 of 8 36010 12 36025 12 36050 12 36085 12 36125 12 Duty Cycle Pulse Mode 0 5 to 20 0 5 to 20 0 5 to 20 0 5 to 20 0 5 to 10 HPulse Mode 20 to 90 20 to 90 20 to 90 20 to 90 10 to 90 Resolution 0 1 0 1 0 1 0 1 0 1 Rise Fall Time Pulse Mode 10 us 10 us 20 us 20 us 20 us HPulse Mode 200 us 200 us 200 us 200 us 200 us Overshoot 296 296 lt 2 lt 2 lt 2 VOLTAGE LIMIT 4 Range 0 14 0V 0 14 0V 0 14 0V 0 14 0 0 14 0 Resolution 100 100 100 mV 100 100 Accuracy 1 200mV 1 200mV 1 200 1 200mV 1 200 CURRENT LIMIT Range CW 0 to 10 5A 0 to 26 2A 0 to 52 5A 0 to 89 2A 0 to 131 24 Range QCW 0 to 22 0A 0 to 53 5A 0 to 106 0A 0 to 179 5A 0 to 232 0A Range HPulse 0 to 10 5A 0 to 26 2A 0 to 52 5A 0 to 89 2A 0 to 131 2A Resolution 10 mA 10 mA 100 mA 10 mA 10 mA Firmware Limit Accuracy 5 0 1 10 0 1 10 0 1 20 0 1 80 0 1 120 Hardware Limit Accuracy 1 10mA 1 10 1 20 1 80 1
80. e illuminated whenever laser output has been enabled and all interlocks have been satisfied After approximately two seconds the actual laser current will be enabled allowing for the generation of laser radiation The LDX 36000 does not provide a circuit to control the illumination of emission indicators An external circuit must be provided 20 LDX 36000 Series Lightwave SAFETY Safety Features and Compliance to Government Regulations Operating Controls as appropriate All operational controls are positioned to prevent operator exposure to laser radiation while adjusting the controls Pe WARNING Use of conirols and or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure A CAUTION Use of the system in a manner other than that described herein may impair the protection provided by the system Location of Safety Labels Refer to Figure 2 1 for the location of all safety labels on the instrument Earth Ground CAUTION Refer to Manual i EE doom iu p e CAUTION Risk of Electric Shock CE Mark Figure 2 1 LDX 36000 Series Rear Panel Labels 50 A 03 10 LDX 36000 Series 21 Earth Ground CE Mark Lightwave 09090 0909000009098095 00000000000909090905 09090900650909090 509000050 090909090 0909000009090 8099962220002089299 29808080600000005050 SAFETY
81. e physically separated Part of the 36000 s laser diode protection strategy includes an adjustable voltage limit where the instrument monitors the voltage across the load and compares it against the programmable limit In the event of an over voltage condition the instrument will automatically disable the current source output When the current source output is enabled depending on the setpoint there is a large dl dt By Equation 1 any additional inductance in addition to the inductance of the cable may cause a voltage spike exceeding the programmed voltage limit and possibly the maximum compliance voltage of the instrument causing an E 503 error The instrument control will disable the output in this event The output terminals are left floating relative to earth ground to suppress AC power on power off transients that may occur through an earth ground path as well as accommodate different laser packages and grounding schemes If the 03 10 LDX 36000 Series 25 OPERATION Connections for General Operation output circuit is earth grounded at some point such as through the laser package and or mount the user must be careful to avoid multiple earth grounds in the circuit Note Cable connections to the laser must be secure Loose connections may cause momentary open circuits which can damage the laser by generating damaging high voltages and currents Figure 3 1 shows the configurations of connecting laser diodes and photodiod
82. e takes place For approximately three seconds all indicators are illuminated and all 7 segment LEDs indicate 8 Then all LEDs are extinguished for approximately three seconds Next the instrument model number is displayed in the left hand display Display 1 while the maximum current for that model is displayed in the right hand display Display 2 Next the firmware version number is displayed in Display 2 Finally a self test is performed to insure that the instrument s hardware and processor are communicating After this test the instrument is ready to operate and will be configured in the state it was in when power was last turned off Lightwave LDX 36000 Series 23 OPERATION j Connections for General Operation Power On State The last saved instrument state may be cleared by recalling the default values These values are stored in bins from which instrument configurations described in more detail in Chapter 4 are set Bin 0 is a read only location and resets the instrument to the default parameters listed in Table 3 1 Table 3 1 LDX 36000 Series Default Configuration GPIB mode in LOCAL via front panel or in REMOTE via GPIB Left hand display displaying laser current Right hand display displaying pulsewidth Mode QCW Mode PULSE Current Limit Setpoint Lim 1 full scale value dependent on model Voltage Limit Setpoint Lim V 5 V Temperature Limit Setpoint Lim T 30 C Pulsewidt
83. e the 36000 measurement of the 5K resistance value with the following command Resistance After measuring and recording the resistance of a 15K resistor replace the 5K resistor with the 15K resistor Retrieve the 36000 measurement of the 15K resistance value with the following command Resistance Calculate the slope and offset of the thermistor voltage measurement with the following equations slope DMM 15K measurement DMM 5K measurement 36000 15K measurement 36000 5K measurement offset DMM 15K measurement slope 36000 15K measurement Send the thermistor voltage calibration to the 36000 using the following command LAS CAL THERMV slope offset After measuring and recording the resistance of a 10K resistor replace the 15K resistor with the 10K resistor Retrieve the 36000 measurement of the 10K resistance value with the following command Resistance Verify that the measurement of the 10K resistor is within the accuracy specifications of the instrument LDX 36000 Series 131 CALIBRATION AND TROUBLESHOOTING Thermistor Calibration If you wish to have ILX Lightwave calibrate your LDX 36000 unit contact customer service at 1 406 586 1244 or 1 800 459 9459 or sales ilxlightwave com 1327 LDX 36000 Series uix Lightwave 03 10 CALIBRATION AND TROUBLESHOOTING Troubleshooting Troubleshooting This section is a guide to troubleshooting the LDX 36000 Series High Power Current Sources So
84. ectively When the default values are entered and Display 1 is configured to show power dashes will be displayed When a nonzero value for threshold is entered the power display will revert to a calculated value based on the current output current setpoint and the threshold and slope efficiency values If the current setpoint is less than the threshold value Display 1 will show LO xx where xx is percentage below threshold Examples las calp response 1 56 3 2 meaning a value of 1 56 W A has been entered for the laser slope efficiency and the laser has a threshold of 3 2 A 80 7 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer CALPD lt nrf value gt Common FRONT PANEL DEVICE DEPENDENT Action Enters the external photodiode responsivity value Parameters An nrf value in mA W The range is 0 000 to 20 000 Notes After this command is issued with a nonzero value and the instrument is configured to display photodiode power Display 1 will show the output power incident on an external photodiode connected to the instrument s photocurrent input If the value entered equals zero the display will indicate measured photocurrent in Amps Examples LAS CALPD 1 43 action The value of 1 43 mA W is entered as the responsivity value for an external photodiode connected to the instrument for power monitoring LASer CALPD nrf value COMMON FRONT PANEL DEVICE DEPENDENT Action Returns t
85. ed by talkers to identify the end of a message 0101 DIO5 DIO2 DIO6 DIO3 DIO7 DIO4 z DIO8 EOI REN DAV 5 GND Twisted pair with DAV NRFD GND Twisted pair with NRFD NDAC EEE GND Twisted pair with NDAC IFC GND Twisted pair with IFC SRQ Me GND Twisted pair with SRQ ATN GND Twisted pair with ATN SHIELD SIGNAL GROUND Figure 4 2 GPIB Connector Diagram 03_10 LDX 36000 Series 49 REMOTE OPERATION 2 Basic GPIB Concepts Reading the GPIB Address Before operating the LDX 36000 remotely its GPIB address must be known Simply press the Local button in the GPIB section of the front panel shown in Figure 4 3 The instrument will display the address in the primary display The factory default address is Addr 01 Figure 4 3 GPIB Local Button Changing the GPIB Address Every device on the GPIB bus must have a unique address If it is necessary to change the address press and hold the Local button and rotate the Adjust knob until the desired address value is displayed When the Local button is released the new GPIB address will be stored in nonvolatile RAM The allowable address range is 1 30 for primary GPIB addressing It is not recommended that zero be used for an address as that is typically reserved for the GPIB controller installed in the computer Extended GPIB addressing is not implemented Changing Operation from Local to Remote Sending a command over
86. egisters normally retain their values at power up as they were at power down unless the power on status clear flag is set true for more information see the PSC definition in the IEEE 488 2 specification The factory default value for this register is B1111110000111110 or HFC3E or 64574 decimal LAS ENAB OUTOFF 1791 action enables the Output Off Register so the laser output will be disabled if any of the conditions listed above occur las enab outoff 0 action disables all output off conditions except those that are permanently enabled Lightwave COMMAND REFERENCE Command Reference LASer ENABl1le OUTOFF COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the value of the Output Off Enable Register Parameters None Notes The response is the sum of the enabled bits and must be a value between 0 and 65535 as detailed below Laser Output Off Register 5 5 4 3 2 1 0 00 Laser Current Limit m 01 Laser Voltage Limit E 02 High Temp Limit E 03 Laser Open Circuit 04 Interlock 1 Open 08 05 Interlock 2 Open x 06 Open Temp Sensor 07 Temp Sensor Shorted 08 Output Enabled 08 Bad S H Conversion S 10 H Current Limit 11 AC Power Failure skeda 12 Laser Open Circuit 2 Et be 13 Power Supply Failure 14 Power Supply Voltage Limit 5 4 3 2 1 0 9 8 7 6 514131 gt 1 o 15
87. ement only and cannot be controlled from the LDX 36000 Cannot display temperature Temperature display has been disabled by setting all three Steinhart Hart thermistor constants to zero Use the Cal T parameter to set the constants to match the thermistor being used Display blanks out when attempting to adjust pulsewidth duty cycle and or Adjustments to these parameters can only occur when the instrument is placed in the appropriate mode For example none of these parameters are adjustable in frequency QCW Ext mode because they are controlled by a signal input into the front panel Ext Pulse in BNC connector LDX 36000 Series Lightwave CALIBRATION AND TROUBLESHOOTING Error Messages Error Messages In the event of a hardware error condition error messages are displayed on the Left hand display or Display 1 In most cases the error message appears for three seconds In the case of multiple error messages the instrument will sequentially show each message for three seconds addition to the hardware errors GPIB errors may be read via the ERR query Table 6 2 lists the numerical error ranges by function Table 6 3 contains all of the potential error messages Not all of these messages may appear on the front panel display some refer to GPIB activities only In remote operation the errors may be read by issuing the ERR query When this is done all of the error messages which are re
88. equest Control E 02 High Temp Limit Am 2 Query Error A 03 Laser Open Circuit Logical k 3 Device Dependent Error f 04 Interlock 1 Error OR f 4 Execution Error m 05 Interlock 2 Error 5 Command Error E 06 Temp Sensor Open 6 User Request Logical je 07 Temp Sensor Shorted 7 Power On fez 08 Output On 7 E 09 Bad Steinhart Hart Conversi 10 Hardware Current Limit Standard Event Status 11 AC Power Failure Enable Register Ts 12 Laser Open Circuit 2 ESE 4 cipes ales E E E 1I 13 Power Supply Failure ESE 14 Power Supply Voltage Limit 5 2 7 8 5 4 3 2 1 15 Element Power Limit Gu Laser Condition Status Enable Register Not Empty LAS ENABle COND nrf a LAS ENABle COND Output Queue b Laser Event Status Register LASerEVEnt Simus to Roger I 5 4 3 2 1 0 8 8 7 6 5 4 3 2 1 0 o0 Laser Curent Limit 0 01 Voltage Limit 1 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 State Change 05 Interlock 2 State Change 06 Temp Sensor Open 07 Temp Sensor Shorted 08 Output On Off Change 09 N A 2 Laser Event Summary 3 Laser Cond Summary 4 Message Available 5 Event Status Summary 6 Service Request Master Status Summary O 7 Error Available Logical 18 1 OR
89. er Request HERR 7 Power On Standard Event Status Enable Register ESE lt nrf gt ESE 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error ESE response 68 meaning the User Request and Query Error bits have been enabled in the Standard Event Status Enable Register 68 2 2 ESR COMMON Standard Event Status Register Query Action Parameters Notes Examples 74 LDX 36000 Series Requests the value of the Standard Event Status Register None Response is the sum of the enabled bits and must be a value between 0 and 255 Allows for the determination of which type of error has occurred Standard Event Status Register ESR 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request 7 Power On Standard Event Status Enable Register ESE lt nrf gt ESE ESR response 32 meaning a command error has occurred Lightwave COMMAND REFERENCE Command Reference IDN COMMON Instrument Identification Bap du Action Requests the instrument to identify itself Parameters None Notes Returns a comma delimited standard format ASCII identification string from information stored in the instrument during manufacture The information will contain at a minim
90. error E 220 will be generated Examples DELAY 500 action Further commands and queries are not executed until approximately 500 milliseconds have elapsed from the time this command is executed LAS LDI 7 7 DELAY 2000 LAS LDV actions The laser output current is set to 7 7 Amps then the current source waits approximately 2 seconds before returning the measured laser voltage 03 10 LDX 36000Series 71 72 COMMAND REFERENCE Command Reference ERRors Action Parameters Notes Examples LDX 36000 Series COMMON FRONT PANEL DEVICE DEPENDENT Returns a list of command and device errors which have occurred since the last query The errors are identified by a number which corresponds to the type of error that occurred Refer to Chapter 4 for information regarding error handling and Chapter 6 for error code explanations None The response data will be a list of current errors The errors are represented by numbers and are separated by commas A response of 0 indicates that no errors were reported The response data is sent as character data Up to 10 error codes are stored between error queries ERR response 0 meaning no errors have been reported Errors response 501 509 meaning the output was disabled due to an interlock being opened and a high temperature limit being reached at some point since the last query Lightwave COMMAND REFERENCE Command Reference ESE nrf value Event Sta
91. ers None Notes If the output was enabled when the command is given the output will be disabled prior to changing modes If the command is given when the instrument is already in the specified mode output will be disabled In this mode pulsewidth is controlled either from the front panel or via GPIB Pulse rate and duty cycle are controlled by an external trigger input from the rear panel BNC Examples LAS MODE TRIG action output is disabled if it was on and the output mode is changed to QCW Trig LASer OUTput nrf value Co FRONT PANEL DEVICE DEPENDENT Action Enables or disables current source output Parameters nrf value 1 on 0 off Notes There is a two second delay after the output is enabled before the shorting relay is opened and current begins flowing Following this the output current slowly ramps up to the current setpoint to protect the laser CW mode only Therefore the time to turn the output on and reach the setpoint current varies from two to approximately three seconds After the output has been enabled it may be useful to wait until the output is stable within tolerance before performing further operations but it is not necessary When the output is off it is safe to connect or disconnect devices to the output terminals When the output is disabled an internal short is placed across the output terminals Examples LAS LDI 7 5 LAS OUT ON action output current setpoint is set to 7 5 am
92. es with the LDX 36000 Series High Power Current Source LDX 36000 Series Current Source Figure 3 1 Laser and Photodiode Connections Laser Current Source Output For the LDX 36000 Series models the current source output connector is either a combination D 9W4 connector on models with less than 50A output CW Figure 3 2 or high current terminals on models with more than 50A output CW Figure 3 3 Laser voltage photocurrent and temperature measurement functions are accomplished through a separate DB 0 connector labeled Sense directly above the high current output connector 26 LDX 36000 Series Lightwave OPERATION Connections for General Operation Output Connector Pinout Ai Laser Anode A2 Laser Anode Measurement Connector A3 Laser Cathode Pinout A4 Laser Cathode 1 Cathode 1 N G 4 Anode 2 Vsense N7 4 N C 4 5 Thermistor 5 B N E 9 Thermistor Figure 3 2 LDX 36000 Output and Measurement Connector Pin Assignments 50A Measurement Connector Pinout 1 Cathode i un 3 ermistor 6 Vsense N C 9 T hermistor Figure 3 3 LDX 36000 Output and Measurement Connector Pin Assignments gt 50A 03 10 LDX 36000 Series 27 OPERATION Connections for General Operation External Interlocks In order to enable the laser current output all interlocks on the instrument must be satisfied There are two separate interlocks
93. esponse data Decimal binary hexadecimal and octal formats are allowed ASCII character data is expected as shown above DECimal is the default type Only the first three letters of the words decimal binary hexadecimal or octal are required When the radix is selected all status condition and event queries will return values in the new radix until the power is shut off or a new RAD command is sent In the cases where the radix is not decimal the flexible numeric type nrf value as shown in the Command Reference diagrams will be replaced by HEX BIN or OCT representation All of the above radices may be used to enter program data at any time without the need for issuing the RADix command The proper prefix must be used with hex H binary 8B or octal O This command may be useful for setting up status reporting blocks The bit wise status representation may be more easily read in BIN HEX or OCT RAD dec action the decimal radix is selected rad hex ESR action the hexadecimal radix is selected response H80 means power on was detected RADix Action Parameters Notes Examples 03 10 DEVICE DEPENDENT Returns the currently selected radix type None DECimal is the default type at power on RAD response Dec the selected radix is decimal rad response Hex the selected radix is hexadecimal RADix response Bin the selected radix is binary LDX 36000Series 117 COMM
94. esults Examples LAS DELAYOUT 135e 6 action Sets the output trigger delay to 135 us from the rising edge of the output current pulse LASer DELAYOUT Common RC PANEL DEVICE DEPENDENT Action Returns the delay in seconds between an output QCW pulse and the output trigger Parameters None Examples LAS DELAYOUT response 2 5e 3 means the delay between an output current pulse and the trigger output is 2 5 ms 03_10 LDX 36000 Series 87 COMMAND REFERENCE Command Reference LASer DISplay DC COMMO FRONT PANEL DEVICE DEPENDENT Action Sets Display 2 to show the QCW Pulse mode duty cycle Parameters None Notes The duty cycle display is automatically turned off when another display selection is enabled Function is disabled unless QCW Pulse mode Examples LAS DIS DC action enables the duty cycle display on Display 2 LASer DISplay DC COMMO FRONT PANEL DEVICE DEPENDENT Action Returns the status of the duty cycle display Parameters None Notes In local operation the status of the button is indicated by the annunciator to the right of Display 2 will be illuminated when the display is in duty cycle mode Examples LAS DIS DC response 0 means that the duty cycle button is not currently active duty cycle is not being shown on Display 2 LAS DIS DC response 1 means that the duty cycle button is currently active duty cycle is shown on Display 2 LASer DISplay Frequency
95. eters None Notes The value returned is a percentage The range for duty cycle value depends on instrument mode pulse or hard pulse mode and model Examples LAS DC response 5 2 means the QCW duty cycle is set to 5 2 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer DEC lt nrf value lt nrf value gt Commo DEVICE DEPENDENT Action Decrements the output current by one or more steps based on the control mode Parameters allow multiple steps to be decremented and the time in milliseconds between decrements to be set respectively Parameters Zero one or two lt nrf values representing the number of steps and the number of milliseconds between steps respectively Notes The decremental default amount is one step The step size can be edited via the LAS STEP command The LDX 36000 default step value is 100 mA when displaying output current and 100 mW when displaying output power A valid laser threshold and slope efficiency value must be entered before variations based on power are allowed If the first optional parameter is used but not the second the user may decrement the current setpoint by a multiple of the LAS STEP size without changing the LAS STEP size If both optional parameters are used the user may create an automated stepping ramp function for the current output Each time the output current is varied an trigger pulse will be output corresponding to the change in current
96. evices may be connected together on the same GPIB interface bus The cables have single male female connectors on each end so that the cables can be stacked This allows multiple cables to be attached to a single instrument However the maximum cable length must not exceed 20 meters 65 feet total or 2 meters 6 5 feet per device The talk and listen addresses of the instrument are identical This GPIB address is read by pressing the GPIB LOCAL button with the address shown on the left hand display The instrument comes from the factory with the GPIB address set to 1 This may be changed from the front panel and is described in the section entitled Changing the GPIB Address in Chapter 4 For additional information refer to Chapter 4 Remote Operation Tilt Foot Adjustment The LDX 36000 Series Current Sources come standard with folding front legs and two rear feet to use as a benchtop instrument Extending the front feet so the instrument front panel is tilted up makes it easier to view the displays To use them place the unit on a stable base and rotate the front legs downward until they lock into position Shipping Kit The LDX 36000 Series Current Sources come with a shipping kit containing accessories the user will find useful in getting the instrument operational These accessories include screws and clip nuts for rack mounting and a DB 9 connector and hood to mate with the 9 pin measurement connector on the instrument s rear panel
97. ey switch in the off position To avoid electric shock do not perform any maintenance on the instrument Qualified service personnel trained in ESD prevention are required High voltages are present on and around the printed circuit boards To disconnect the AC mains supply remove the power cord from the instrument If the AC mains outlet is not easily accessible after instrument installation ensure that an external disconnect switch is provided to remove AC power to the instrument There are no user serviceable parts inside the instrument excepting any external fuses in the AC power entry module Contact ILX Customer Service for information about servicing the instrument Options and Accessories Options and accessories for the LDX 36000 series of instruments include the following Table 1 1 Options and Accessories Description Model Number 125 Amp Output Cable D sub CC 340 50 Amp Output Cable 6 feet CC 370 125 Amp Output Cable 6 feet CC 390 125 Amp Output Cable 12 feet CC 395 Calibrated 10 Thermistor TS 510 Uncalibrated 10 kQ Thermistor TS 520 Our goal is to make the best laser diode instrumentation available anywhere To achieve this we need your ideas and comments on ways we can improve our products We invite you to contact us at any time with your suggestions LDX 36000 Series Lightwave INTRODUCTION AND SPECIFICATIONS
98. f value gt lt nrf value gt DEVICE DEPENDENT Action Enters the slope and offset calibration constants for laser current limit setpoint Parameters Two nrf values The first parameter is the setpoint slope and the second is the setpoint offset Notes This command allows for calibration and linearization of the laser current limit versus setpoint The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal limiti 1 0046 0 00426 action Adjusts the internal calibration to linearize the current limit setpoint by entering a new slope and offset of 1 0046 and 0 00426 respectively Las Cal LIMITI 1 0 0 0 action Resets the laser current limit setpoint calibration constants to default values LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer CAL LIMITI DEVICE DEPENDENT Action Returns the current laser current limit setpoint calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal limiti response 1 545116 0 379247 meaning a slope of 1 545116 and an offset of 0 379247 had been previously entered as part of the calibration process LASer CAL LIMITV l
99. ference LASer DISplay PWP FRONT PANEL DEVICE DEPENDENT Action Returns the status of the constant duty cycle pulsewidth setpoint display Parameters None Notes In local operation the status of either PW button is indicated by the annunciator to the right of Display 2 ms will be illuminated when the display is in PW mode Examples LAS DIS PWP response 0 means that the pulsewidth setpoint display on Display 2 is not currently active LAS DIS PWP response 1 means that the pulsewidth setpoint display on Display 2 is currently active LASer DISplay T MI FRONT PANEL DEVICE DEPENDENT Action Sets Display 2 secondary display to show measured temperature Parameters None Notes The temperature display is enabled only when all three Steinhart Hart constants are nonzero The output current setpoint display is automatically turned off when another display selection is enabled Examples LAS DIS T action enables the temperature measurement display on Display 2 LASer DISplay T Commo FRONT PANEL DEVICE DEPENDENT Action Returns the status of the temperature measurement display Parameters None Notes In local operation the status of the T button is indicated by the annunciator to the right of Display 2 C will be illuminated when the display is in T mode Examples LAS DIS T response 0 means that the temperature measurement display is not currently active las dis t response 1 means that the
100. for thermistor voltage measurement AAS CALP 2 Specifies the slope efficiency and threshold values of the laser being operated AAS CALP NONE Returns the slope efficiency and threshold values currently entered in the instrument AAS CALPD 1 Specifies the external photodiode responsivity CAL PD value AAS CALPD NONE Returns the external photodiode responsivity CAL PD value AAS CALT 3 Specifies the thermistor Steinhart Hart constants AS CALT NONE Returns the currently entered thermistor Steinhart Hart constants LAS COND NONE Returns the value of the Laser Condition Status Register LAS DC 1 Specifies the duty cycle to be used in QCW mode LAS DC NONE Returns the QCW mode duty cycle setpoint AAS DEC 2 Decreases the laser current setpoint value by one or more steps AAS DELAYIN 1 Specifies the delay between input trigger and output pulse in seconds AAS DELAY IN NONE Returns the input trigger delay AS DELAYOU 2 Specifies the delay between output pulse and output trigger in seconds AS DELAYOUT NONE Returns the output trigger delay LAS DIS DC NONE Turns on Display 2 to show duty cycle LAS DIS DC NONE Returns on off status of the duty cycle display LAS DIS F NONE Turns on Display 2 to show frequency LAS DIS F NONE Returns on off status of the frequency display LAS DIS LDI NONE Turns on Display 1 to show laser output current LAS DIS LDI NONE Returns on off status of the laser output current display LAS DIS
101. forward voltage measurement is shown on Display 1 LASer DISplay Power Co FRONT PANEL DEVICE DEPENDENT Action Sets Display 1 to show laser output power Parameters None Notes Display is disabled unless a nonzero value for threshold has been entered either via the front panel or the LAS CALP command The output power display is automatically turned off when another display selection is enabled Optical power display does not display constant power setpoint or measured optical power Through the use of previously determined laser threshold and slope efficiency values the display indicates calculated optical power based on the current output current setpoint Examples LAS DIS P action enables the output power display on Display 1 90 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer DISplay Power FRONT PANEL DEVICE DEPENDENT Action Returns the status of the power setpoint display Parameters None Notes In local operation ths status of the P button is indicated by the annunciator to the right of Display 1 W will be illuminated when the display is in P mode Examples LAS DIS P response 0 means that the power display is not currently active output optical power is not being shown on Display 1 LAS DIs p response 1 means that the power display is currently active output optical power is shown on Display 1 LASer DISplay PPD FRONT PANEL DEVICE
102. g mode is selected by pressing the QCW Mode Select button Figure 3 10 until the TRIG LED is illuminated In this mode pulsewidth is configurable from the front panel or through GPIB An output pulse of this specified pulsewidth will be output whenever a trigger signal is received at the Trigger Input BNC The output pulse may be delayed by a value specified through GPIB The output pulse is triggered on the rising edge of the TTL input trigger pulse A TTL level 50 Q output trigger will be output from the Trigger Output BNC for each current pulse produced regardless of QCW operational mode This trigger pulse may be delayed from the output pulse by a value specified through GPIB as well Refer to Figure 3 11 for a QCW timing diagram which shows the relationship between the delays and the current pulse In this mode duty cycle percentage and frequency displays are disabled Pressing the 96 or Freq button will result in dashes being shown in Display 2 AA warnine If the frequency of the external trigger exceeds 1 kHz the instrument will ignore the next rising edge The output pulse will be limited to 1 kHz 03_10 LDX 36000 Series 39 OPERATION Front Panel Operation Triggers on Leading Edge TTL High 2V 5V QCW Trig Mode Input Trigger Ere Pulse High Z Delay specified by LAS DELAYIN command lt gt Output Current Pulse Delay specified by LAS DELAYOUT command TTL High
103. h 100 us Laser Output OFF C 1 125 x10 C3 2 347 x10 855 x107 Laser Current Step 0 01A Laser P Setpoint 0 0 W Cal P 0 1 0 0 A Cal PD 0 0 mA W Frequency 100 Hz Current Setpoint 0 0 A Connections for General Operation When connecting a laser diode to the LDX 36000 Series current source it is recommended that the instrument be powered up and the output disabled In this condition a low impedance shunt is active across the output terminals When disconnecting devices it is only necessary to disable the output The low impedance shunt exists across the output terminals with the power to the instrument off as well We recommend low resistance and inductance cabling for operation of the LDX 36000 in CW QCW and Hard Pulse modes For best performance in any of these instrument modes we recommend the ILX CC 390 or CC 395 cable These are flat copper cables with low inductance and resistance that connect directly to the instrument through the rear panel connector We also recommend that the end of the cable be as close to the laser as possible Stranded wire cables can be used for operation in CW mode only The proper wire gauge should be used to minimize heating and twisted from the instrument to the laser to minimize inductance as a result of the loop of conductive wire formed between the instrument and the laser 24 LDX 36000 Series Lightwave OPERATION Connectio
104. hat the first time user begin learning the commands by using the full path notation Once familiar with the commands command path shortcuts may be used root a Cmds UT ANNE om CLS ERR CALP CAL BIS ENAB MODE ESE MES CALP 2 5 iE E COLERA 101 DC GETMEAS IDN RAD 101 COND d QUTPUT HPULSE sope RAD LDV Eve 4SET PULSE gt SECURE COND LDV RR 11 TRIG mee LIMIT LDI QUTOFF pscp TERM UMITI LDI OUTOFF v PUD TERM JO PUD TIME DELAYIN 1 DI RCL TIMER DELAYIN jud RST DELAYOUT MDI GRE F THERM PWF E ITHERMV TST INC TEE LDI T LDI T LDV MODE OUT QUT ip iP PDBIAS PDBIAS PPD PWF PWP STEP STEP Figure 4 4 Command Path Structure 54 7 LDX 36000 Series Lightwave REMOTE OPERATION Command Syntax Syntax Summary GPIB commands must contain all of the letters shown in uppercase in the command definition Optional letters shown in lowercase for some device dependent commands in the command reference Chapter 5 are useful for clarity but must be in the correct sequence A single white space must separate a command from its parameters or data White space is normally the space character space bar Other control characters are
105. he current duty cycle setpoint as a percentage on Display 2 The Const LED is illuminated If the Adjust button is pressed and the Adjust knob rotated within three seconds the duty cycle may be changed 38 LDX 36000 Series Lightwave OPERATION Front Panel Operation Note The left hand P button in conjunction with the button denotes operation in constant duty cycle and is indicated by the Const LED below Display 2 This implies that when pulsewidth is varied the current value for duty cycle will remain constant and pulse frequency will change as appropriate until the frequency reaches its maximum or minimum limit For example with a duty cycle of 5 the pulsewidth cannot be set smaller than 50 us as this would cause the pulse period to go below 1 ms and frequency to exceed 1 kHz which is the maximum value allowed Pressing the right P button configures Display 2 to show QCW pulsewidth setpoint as well The difference being that now operation is in terms of constant frequency or pulse rate This is verified by the illumination of the Const Freq LED below Display 2 Pressing the Adjust button allows pulsewidth to be varied but with the duty cycle changing as required to maintain the currently set value for frequency Note Maximum frequency under any condition in QCW Pulse Mode is 1 kHz Note Refer to Appendix A for allowed duty cycle and frequency combinations with varying pulsewidth QCW Trig Mode QCW Tri
106. he external photodiode responsivity value Parameters None Notes If this value is zero the photodiode power display will indicate measured photocurrent in Amps otherwise it will display calculated optical power from measured photocurrent Examples LAS CALPD 1 43 meaning that the value of 1 43 mA W was entered as the responsivity value for an external photodiode connected to the instrument for power monitoring 03_10 LDX 36000 Series 81 82 COMMAND REFERENCE Command Reference LASer CALT lt nrf value gt lt nrf value gt lt nrf value gt Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Enters the Steinhart Hart equation constants for temperature measurement Three lt nrf values gt for the three Steinhart Hart equation constants The range of acceptable values for each constant is 9 999 9 999 These values are scaled by the appropriate exponential value for the Steinhart Hart equation The default value for each constant are the typical values for an uncalibrated 10kQ thermistor shown below When all three constants are zero the temperature display is disabled and the open sensor and temperature limit error LEDs are disabled and will not disable the output Typical values to use for an ILX Lightwave uncalibrated 10 kQ thermistor are C1 1 125 10 3 C2 2 347 x10 0 855 x107 All three values must be entered If one or more values are missing error
107. hown in Figure 3 6 When the output is enabled the output pulses run asynchronously to any trigger input that may be connected to the instrument Figure 3 13 QCW Mode Box A CAUTION Limit cable length to 6 feet 1 83 m to comply with CE testing standards Constant Duty Cycle vs Constant Frequency Because the QCW parameters of pulsewidth frequency and duty cycle are interrelated adjusting one parameter will simultaneously affect the other parameters This dependency can be problematic if one is attempting to for example control the power loading of the laser while still being able to vary pulsewidth The solution to this application is to operate with a constant duty cycle It may be true instead that the test being run requires an output whose frequency or pulse period does not change with pulsewidth In this case the preferred operational mode would be constant frequency Information on how to specify either of these modes is given below Pressing the left P button changes Display 2 to show pulsewidth setpoint in milliseconds The Const LED below Display 2 is illuminated Pulsewidth is adjusted by pressing the Adjust button and then rotating the Adjust knob within three seconds The new pulsewidth value will be stored in nonvolatile RAM after a three second timeout If either Py button is pressed while in CW mode the display will be blanked out with dashes Pressing the 96 button displays t
108. ibration Calibration of the 36000 requires the following equipment 6 Digit Digital Multimeter capable of taking a 4 Wire resistance measurement Agilent 34401A 6 Digit Multimeter or similar Computer with GPIB capabilities Power supply with a range of at least 15 Volts and capable of outputting a minimum of 500mA Agilent E3631A Triple Output DC Power Supply or similar Transducer capable of handling output current of 36000 unit LEM 400 5 High Accuracy and Stability Current Transducer or similar Resistors 5K 10K 15K High Power Resistor capable of dissipating at least 80 FS power of the specific 36000 module Current source for photodiode with high stability and capable of a 10mA output Keithley 263 or similar 1247 LDX 36000 Series Lightwave CALIBRATION AND TROUBLESHOOTING Calibration Overview Beginning Calibration To begin the calibration process turn on the 36000 and allow it a warm up period of 60 minutes prior to performing any calibration Once this warm up period is over connect the 36000 to a GPIB compatible computer The default GPIB address for the 36000 is 1 This can be changed on the front panel of the 36000 All calibrations require slope and offset values to be sent to the 36000 Be sure to reset the calibration to default values 1 0 before each calibration is performed 03_10 LDX 36000 Series 125 CALIBRATION AND TROUBLESHOOTING Laser Diode Curre
109. ies 75 76 COMMAND REFERENCE Command Reference LASer CAL LDV lt nrf value gt lt nrf value gt DEVICE DEPENDENT Action Enters the slope and offset calibration constants for forward voltage measurement Parameters Two nrf values The first parameter is the slope and the second is the offset of the measurement Notes This command allows for calibration and linearization of the laser voltage measurement at the output connector The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal ldv 2 953417 0 354155 action Adjusts the internal A D calibration to linearize the measurement by entering a new slope and offset of 2 953417 and 0 354155 respectively Las Cal LDV 1 0 0 0 action Resets the laser voltage measurement calibration constants to default values LASer CAL LDV DEVICE DEPENDENT Action Returns the current laser voltage measurement calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal ldv response 1 545116 0 379247 meaning a slope of 1 545116 and an offset of 0 379247 had been previously entered as part of the calibration process LASer CAL LIMITI lt nr
110. ions e g power on off current on off as well as accidental situations e g power line plug removal Normal operations exclude pulse characteristics such as overshoot and undershoot 9 Maximum output current transient from a 1000 V power line transient spike 10 All QCW mode pulse specifications taken with ILX CC 390 output cable Use of the instrument with alternative cabling may affect pulse performance 11 of reading 12 Measured from 10 to 90 points at half scale output at the end of an ILX CC 390 cable into a non inductive load 14 m LDX 36000 Series Lightwave 13 14 15 16 17 18 19 20 21 22 23 24 25 INTRODUCTION AND SPECIFICATIONS Specifications of set point at the end of ILX CC 390 cable into a low inductance load Overshoot may increase with inductance Voltage limit is higher than compliance to ensure output is not disabled due to overshoot caused by impedance mismatch Firmware controlled limit accuracy Internal hardware limit scaled with setpoint limit From start of ouput pulse to trigger From start of trigger to output pulse of reading offset of FS The responsivity value is user defined and is used to calculate optical power At 25 C accuracy while using ILX Lightwave TS 510 calibrated 10 kQ thermistor Interlock fault time measured from event to device shorting protection enabled Total external dimensions including handles and support feet Handles add 1 5
111. is set to 260 Hz 03 10 LDX 36000Series 101 102 COMMAND REFERENCE Command Reference LASer INC lt nrf value gt lt nrf value gt Action Parameters Notes Examples DEVICE DEPENDENT Increments the currently selected control mode setpoint by one or more steps Optional parameters allow multiple steps to be incremented and the time in milliseconds between increments to be set respectively Zero one or two lt nrf values gt specifying the number of steps and the number of milliseconds between steps respectively The incremental default amount is one step The step size can be edited via the LAS STEP command The LDX 36000 default step value is 100 mA when displaying output current and 100 mW when displaying output power A valid laser threshold and slope efficiency value must be entered before variations based on power are allowed If the first optional parameter is used but not the second the user may decrement the current setpoint by a multiple of the LAS STEP size without changing the LAS STEP size If both optional parameters are used the user may create an automated stepping ramp function for the current output Each time the output current is varied an trigger pulse will be output corresponding to the change in current If the first optional parameter is entered as zero LAS INC 0 the command will be ignored The minimum time to complete one increment is approximately 20 ms Therefore value
112. it in Amps None The current limit is in effect in all modes of operation las lim I response 6 5 means the current limit is set to 6 5 A LASer LIMit T nrf value Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Sets the high temperature limit One nrf value specifying the high temperature limit in C The temperature limit is disabled by default by setting all three values of the Steinhart Hart constants to zero Setting these constants to nonzero values enables temperature measurement and the action of the temperature limit Even if temperature measurement is disabled a high temperature limit may still be entered LAS LIM T 35 0 action sets the high temp limit to 35 0 C LASER limit t 30 5 action sets the high temperature limit to 30 5 LASer LIMit T Action Parameters Notes Examples LDX 36000 Series FRONT PANEL DEVICE DEPENDENT Returns the high temperature limit in C None The temperature limit may be queried even if temperature measurement has been disabled las lim t response 25 7 means the high temperature limit has been set to 25 7 Lightwave COMMAND REFERENCE Command Reference LASer LIMit V nrf value COMMON FRONT PANEL DEVICE DEPENDENT Action Sets the laser compliance voltage limit Parameters nrf value specifying the compliance voltage limit in Volts Notes The voltage limit setting is useful for
113. l exposure to the output beam or its reflection those within the nominal hazard zone should wear laser protective eyewear specific to the laser wavelength being used 8 Operate the laser only in an enclosed light tight room A collimated output beam will remain hazardous over large distances and thus presents a potential hazard if not confined 9 Post warning signs within and along the periphery of the nominal hazard zone to alert those present of the potential hazard All entrances should be posted with warning signs 10 Advise all those that may work around the laser of these precautions It is recommended that the laser be operated in a room with controlled and restricted access Any available interlocks on the laser system should be connected to doors that enter the restricted area 03_10 LDX 36000 Series 19 SAFETY Safety Features and Compliance to Government Regulations Safety Features and Compliance to Government Regulations The LDX 36000 series laser diode controllers are designed to meet CE safety standards as detailed in the specifications If part of a complete laser system it is compliant with CDRH and CE laser safety standards The following features are incorporated into the controller as required to conform to several government requirements The applicable U S Government requirements are contained in 21 CFR chapter 1 subchapter J part 1040 administered by the Center for Devices and Radiological Heal
114. laser protection When the maximum operating voltage of a laser is known the user may set the voltage limit to a value slightly higher than the maximum operating voltage Then if the laser is accidentally disconnected the current source will quickly sense the over voltage and shut off Examples LAS LIM V 5 0 action sets the compliance voltage limit to 5 0 V Laser limit V 4 7 action sets the compliance voltage limit to 4 7V LASer LIMit V FRONT PANEL DEVICE DEPENDENT Action Returns the value of the laser compliance voltage limit setting Parameters None Notes The voltage limit is active in all operational modes Examples las lim v response 6 7 means the compliance voltage limit is set to 6 7 V LASer LIV GETMEAS COMMO DEVICE DEPENDENT Action Returns LIV data from memory in groups of 25 points each time the command is executed For each current setpoint step photodiode current laser current setpoint and laser forward voltage values are saved to memory Parameters None Notes If the data buffer is empty executing the command will return empty The respective data is erased after each execution of the command The data is pulled in blocks up to 25 data points long with each execution of the command Examples LAS LIV GETMEAS response 3 5 00 1 51 120 10 00 1 81 144 15 00 2 14 172 20 00 2 31 207 25 00 2 48 means data from a five point LIV run with pd current uA lase
115. last accessed parameter will be illuminated after the first button press Repeated presses of the Parameter Select button will cycle through the different selections Once illuminated press the Parameter Set button and rotate the Adjust knob to change the current limit The LIM LED will flash to indicate it is in adjust mode Voltage and temperature limits may be set in exactly the same way as described above Repeatedly press the Parameter Select button until the appropriate limit is illuminated then press the Parameter Set button and rotate the Adjust knob to set the appropriate value If the Parameter Set button is not pressed within three seconds of pressing the Parameter Select button the display reverts to normal operation Pressing the Parameter Select button while in normal operational mode will illuminate the parameter that was highlighted the last time the parameters were adjusted even after power cycling 34 LDX 36000 Series Lightwave 03 10 OPERATION Front Panel Operation n Configuring the Operational Mode Figure 3 9 Mode Selection The LDX 36000 Series has two main operational modes CW continuous wave and QCW quasi continuous wave or pulsed The currently selected operating mode may be identified in two ways Either the CW QCW LED will be illuminated in the mode selection box in the lower right hand section of the front panel as shown in Figure 3 8 In addition
116. ltiple test configurations can be saved and easily recalled through Save and Recall functions from the front panel or through the GPIB interface 2 7 LDX 36000 Series Lightwave INTRODUCTION AND SPECIFICATIONS Product Overview HEH Lightwave Lox 36000 HIGH POWER LASER DIODE CURRENT SOURCE 56045 70 DISPLAY 1 DISPLAY 2 888 88888 UMT 02 OPEN CIRCUIT DISPLAY 1 QCW MODE GPIB TRIGGER 009000 10909 155 DOTT 2 _ soe i i 20550 000000090 2 D Di 2 o 1 290 Figure 1 2 LDX 36000 Series Rear Panel lt 50 Figure 1 3 LDX 36000 Series Rear Panel gt 50 A 03 10 LDX 36000 Series 3 4 LDX 36000 Series INTRODUCTION AND SPECIFICATIONS Installation Installation Initial Inspection After receiving the LDX 36000 Series Current Source verify that the following items were shipped along with the instrument LDX 36000 Series User s Guide Power Cord Appropriate for the Local Service Shipping Kit Grounding Requirements The LDX 36000 Current Source comes with a three conductor AC power cable The power cable must be inserted into an approved three contact electrical outlet or used with a three cont
117. me of the more common symptoms are listed here and the appropriate troubleshooting actions are given It is recommended that troubleshooting begin at the top of the list and work toward the bottom Read the symptom descriptions and follow the steps for corrective action which apply If problems are encountered beyond this list contact ILX Lightwave Customer Service for additional support Table 6 1 Symptoms and Corrective Actions Symptom Corrective Actions LDX 36000 will not power up Check AC power line voltage power cord connection and fuse Power on but display is frozen buttons do not operate This may occur if the instrument loses power AC line briefly Turn power switch off and back on to restart Verify instrument is not in Remote mode by pressing Local button and then try to change display mode Power on but no output Verify interlocks are satisfied output cable is securely connected to output connector and connections to laser are secure Temperature cannot be displayed or measurement is incorrect Verify Steinhart Hart constants have been set to non zero values and are appropriate for the thermistor being used Output goes off intermittently Verify interlock connections An intermittent interlock will disable output Check to make sure AC power cord connection is secure Power line drop outs may reset the instrument and when power is restored Output will remain disabled
118. ment equipment with remote operation capability will generally communicate through a GPIB interface GPIB General Purpose Interface Bus is the common name for ANSI IEEE Standard 488 2 1987 an industry standard for interconnecting test instruments in a system Everything that can be done from the front panel can also be done remotely and in some cases with more flexibility For instance in remote mode there is access to functions and modes not available from the front panel such as commands that will increment LAS INC or decrement LAS DEC the current setpoint by a predefined step value LAS STEP The following sections explain the fundamentals of operating the LDX 36000 Current Source remotely through the GPIB interface Basic GPIB Concepts The information in this basic concepts section is normally not necessary to successfully operate the LDX 36000 through its GPIB interface because the host computer s GPIB controller usually handles the details However it is a useful perspective in understanding GPIB Data and Interface Messages GPIB devices communicate with each other by sending data and interface messages Data contains device specific information such as programming instructions measurement results and instrument status Each device has an address number and ignores all data traffic not addressed to it Depending on its content data is often called a device dependent message or a device dependent commana Interface me
119. meters Two nrf values The first parameter is the slope and the second is the offset Notes This command allows for calibration of the thermistor current output The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal thermi 1 004874 0 049776 action Adjusts the internal D A calibration to adjust the thermistor current by entering a new slope and offset of 1 004874 and 0 049776 respectively Las Cal Therml 1 0 0 0 action Resets the photocurrent measurement calibration constants to default values 78 LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference LASer CAL THERMI DEVICE DEPENDENT Action Returns the current thermistor current calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal thermi response 1 0 0 0 meaning a slope of 1 0 and an offset of 0 0 had been previously entered as part of the calibration process LASer CAL THERMV lt nrf value gt lt nrf value gt DEVICE DEPENDENT Action Enters the slope and offset calibration constants for thermistor voltage measurement Parameters Two nrf values The first parameter is the slope and the seco
120. n Output off Temp Sensor Open LED illuminated Output off action may be disabled via the Output Off Register or setting thermistor calibration constants to zero Temp Limit Output off Temp Limit LED illuminated Output off action may be disabled via the Output Off Register or setting thermistor calibration constants to zero Temperature Measurement Setup The LDX 36000 Series High Power Laser Current Sources are designed to measure temperature of a laser diode mount and disable the output if temperature exceeds a specified value Temperature measurement is accomplished by measuring the resistance of a negative temperature coefficient NTC thermistor An NTC thermistor is a device whose resistance decreases with increasing temperature in a highly nonlinear fashion A current of 100 is used to enable measurement of the voltage across the thermistor By measuring the voltage and knowing the current flowing through the thermistor the resistance may be calculated by Ohm s Law The resistance of an NTC thermistor is a nonlinear function of temperature characterized by the Steinhart Hart Equation This equation is described in detail in several ILX Lightwave Application and Tech Notes available from the ILX website and may be referred to for additional information In the LDX 36000 three constants are required to calculate the temperature from the measured resistance and are specified as the thermistor calibration constants C1 C
121. n unsigned 16 bit value E 210 PROGRAM will not convert to a floating point value E 211 PROGRAM will not convert to a character value E 213 PROGRAM is incorrect block data length E 214 PROGRAM DATA length exceeds maximum E 301 A RESPONSE MESSAGES was ready but controller failed to read it query error E 302 Query error Device was addressed to talk but controller failed to read all of the RESPONSE MESSAGE E 501 Laser interlock 1 disabled output E 502 Laser interlock 2 disabled output E 503 High impedance condition E 504 Laser current limit disabled output E 505 Laser voltage limit disabled output E 506 AC power failure E 509 Laser output disabled because of High Temperature Limit condition 511 Laser control unknown error disabled output E 525 Open temperature sensor error E 526 Shorted temperature sensor error E 527 Power supply failure E 528 Power supply voltage limit E550 Pass element power limit E 599 Laser open circuit 2 LDX 36000 Series Lightwave CALIBRATION AND TROUBLESHOOTING i Error Messages E 503 Error 503 error is defined as a high impedance condition This can be caused by a load voltage exceeding the compliance voltage of the instrument or high load inductan
122. nd is the offset Notes This command allows for calibration of the thermistor voltage measurement The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal thermv 1 1154 0 0007 action Adjusts the internal A D calibration to correct the thermistor voltage measurement by entering a new slope and offset of 1 1154 and 0 0007 respectively Las Cal ThermV 1 0 0 0 action Resets the photocurrent measurement calibration constants to default values LASer CAL THERMV DEVICE DEPENDENT Action Returns the current thermistor voltage measurement calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal thermv response 1 566841 0 089274 meaning a slope of 1 566841 and an offset of 0 089274 had been previously entered as part of the calibration process 03 10 LDX 36000Series 79 COMMAND REFERENCE Command Reference LASer CALP nrf value nrf value FRONT PANEL DEVICE DEPENDENT Action Specifies the slope efficiency and threshold values for the laser diode currently attached to the LDX 36000 These values are used while Display 1 is in Power Mode In this mode the display indicates
123. nel Front Panel Front Panel Front Panel GPIB GPIB GPIB GPIB TRIG Front Panel Front Panel Trig In Trig In GPIB GPIB HARD Front Panel Front Panel Front Panel Front Panel PULSE GPIB GPIB GPIB GPIB Note In all QCW modes current setpoint remains configurable only from the front panel or via GPIB QCW mode is entered by pressing the Mode button Figure 3 10 twice to switch from CW to QCW mode Once the QCW operational mode has been enabled the last enabled QCW mode LED will be illuminated There are two current ramp features built into the LDX 36000 Series drivers when pulsing high power laser diodes in either QCW mode or HPulse mode When the output is first enabled with the OUTPUT push button there is a two second delay followed by a current ramp consisting of discrete steps until the set point current is reached see Figure 3 10 The current ramp starts from a small current of 0 5 amps increasing to 0 7 to 1 amp depending on the model and the instrument mode of operation During this time a safe operating overhead voltage is calculated and set by the instrument controller The current ramp continues up to a maximum value of 10A depending on the set point and the load voltage For example if the LDX 36125 24 QCW pulse mode set point is 220 amps when the output is enabled and following the two second delay the current output will be ramped to 0 5 amp then 1 0 amp and finally increasing by 10 amp s
124. nge 0 us to 1s Resolution 0 0196 5 us Jitter 100 ns Trigger Input TTL Level rising edge triggered single shot to 1 KHz high impedance Delay to Output Programmable Accuracy 2 us 0 05 Range 20 us to 1s Resolution 0 0196 5 us Jitter 200 ns Pulse Trigger Output TTL Level high impedance active high MEASUREMENT Forward Voltage 12 LDX 36000 Series Lightwave INTRODUCTION AND SPECIFICATIONS CHAPTER 1 Specifications Table 1 2 LDX 36000 Series Specifications Continued Sheet 7 of 8 36010 35 36018 35 36040 30 36070 30 36125 24 Range 0 to 35 00V 0 to 35 00V 0 to 30 00V 0 to 30 00V 0 to 24 00V Resolution 10 mV 10 mV 10 mV 10 mV 10 mV Accuracy 0 05 20mV 0 05 20mV 40 0596 20mV 40 0596 20mV 0 05 20mV Photodiode Current Range to 10000A to 10000A 3 to 10000A 3 to 10000A to 10000A Resolution 3 pA 3 pA 3 pA 3 pA 3 pA Accuracy 0 1 0 1 0 1 0 1 0 1 Reverse Bias Range 0 to 15 V 0 to 15 V 0 to 15 V 0 to 15 V 0 to 15 V Resolution 100 mV 100 mV 100 mV 100 mV 100 mV Accuracy 2 5 FS 2 5 FS 2 5 FS 2 5 FS 2 5 FS PD Responsivity Range mA W 0 001 to 10 000 0 001 to 10 000 0 001 to 10 000 0 001 to 10 000 0 001 to 10 000 Resolution mA W 001 001 001 001 001 Power Control Range Range 0 to 2500W 0 to 2500W 0 to
125. ns for General Operation Note With high currents connections to the cable end or the laser should be secure and tight Avoid point contracts maximizing surface area for connections is advisable Increased resistance due to poor connections will cause high voltage drops and I R heating which could be dangerous or damaging to improperly sized conductors and or the conductor insulation Inductance An electric current flowing around a circuit produces a magnetic field and hence a magnetic flux through the circuit The ratio of the magnetic flux to the current is called the inductance The voltage developed across an inductance L in Henries when the current is changing at a rate given by dl oag dt in A s is V Ldl dt Equation 1 The inductance of a circular conductive loop made of a circular conductor can be determined using 2 87 L T Hokr m 24 Y Equation 2 a Where pg and p are the permeability of free space and wire respectively risthe radius of the loop aisthe radius of the conductor Y is a constant Y 0 when the current flows in the surface of the wire skin effect Y 1 4 when the current is homogeneous across the wire From Equation 2 it is easy to see that the inductance of a conductor is directly proportional to the radius of the conductor loop A loop area is formed with wire conductors from the source anode through the laser and returning cathode to the source when they ar
126. nsor Open Logical 07 Temp Sensor Shorted OR 08 Output On 09 Bad Steinhart Hart Conversion 79 10 Hardware Current Limit x 11 AC Power Failure to a 14 Power Supply Voltage Limit 15 2 716 4 0 15 Pass Element Power Limit Laser Condition Status Enable Register LAS ENABle C OND nrf LAS ENABle COND 1 Laser Current Limit 256 Output On 2 Laser Voltage Limit 512 BadSteinhart Hart Conversion 4 High Temperature Limit 1024 Hardware Current Limit 8 Laser Open Circuit 2048 AC Power Failure 16 Interlock 1 Error 4096 Laser Open Circuit 2 32 Interlock 2 Error 8192 Power Supply Failure 64 Temp Sensor Open 16384 Power Supply Voltage Limit 128 Temp Sensor Shorted 32768 Pass Element Power Limit The enabled conditions can be set via the LASer ENABle COND command The condition status can be monitored by the LASer COND query Examples LAS ENAB COND response 260 means the high temperature limit and output on conditions will be reported to the Status Byte Bit 3 Radix Hex Laser Enable Cond response HFFFF means that any and all of the above conditions will be reported to Bit 3 of the Status Byte 03 10 LDX 36000 Series 95 COMMAND REFERENCE Command Reference 96 LASer ENABle EVEnt nrf value Cow FRONT DEVICE DEPENDENT ANEL Action Sets the Laser Status Enable Event Register for summary in bit 2 of the Status Byte and generation of service requests
127. nstants for the laser compliance voltage measurement jAS CAL LIMITI 2 Enters the slope and offset calibration constants for the laser current limit setpoint jAS CAL LIMITI NONE Returns the slope and offset calibration constants for the laser current limit setpoint jAS CAL LIMITV 2 Enters the slope and offset calibration constants for the laser voltage limit setpoint jAS CAL LIMITV NONE Returns the slope and offset calibration constants for the laser voltage limit setpoint AAS CAL MDI 2 Enters the slope and offset calibration constants for the monitor photodiode current measurement AS CAL MDI NONE Returns the slope and offset calibration constants for photodiode current measurement AS CAL THERMI 2 Enters the slope and offset calibration constants for thermistor current 66 LDX 36000 Series Lightwave 03 10 Remote Command Reference Summary COMMAND REFERENCE Table 5 1 Remote Command Summary Reference List Continued Sheet 2 of 5 Name Parameters Function AAS CAL THERMI NONE Returns the slope and offset calibration constants for thermistor current AS CAL THERMV 2 Enters the slope and offset calibration constants for thermistor voltage measurment AS CAL THERMV NONE Returns the slope and offset calibration constants
128. nt Setpoint Calibration Laser Diode Current Setpoint Calibration 1 Set the 36000 output mode to CW with the following GPIB command LAS MODE CW 2 Set the current calibration to default values by sending the following command LAS CAL LDI 1 0 3 Use a shorted output cable to connect the 36000 current output to a high accuracy current transducer 4 Setthe current limit the maximum value for the instrument 5 Set the current setpoint to 20 of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps 6 Turn the 36000 current output on with the following command LAS OUT ON 7 Record the value of current measured by the current transducer 8 Setthe current setpoint to 80 of the maximum value for the instrument with the following command LAS LDI setpoint where setpoint is the current value in amps 9 Record the value of current measured by the current transducer 10 Calculate the slope and offset of the CW current setpoint with the following equations slope 36000 80 setpoint 36000 20 setpoint Transducer 80 measurement Transducer 2096 measurement offsetAmps 36000 80 setpoint slope Transducer 80 measurement Convert the offset in terms of amps to offset in terms of DAC counts offsetDacCounts 65 535 1 1 QCW CURRENT 11 Send the CW current setpoint calibration to the 36000 using the following command LAS C
129. ntana U S A 59771 www ilxlightwave com In Europe Optical Test and Calibration Ltd Listerhills Science Park Bradford BD7 1HR United Kingdom Phone 44 1274 393857 Fax 44 1274 393336 Online www otc co uk Email sales otc co uk In China ETSC Technologies Co 9 F Building 1 SBI Street Dongxin Road East Lake High Tech Development Zone Wuhan Hubei 430074 PRC China Phone 86 27 8717 0152 86 27 8741 2681 86 27 8780 7925 Fax 86 27 8780 7133 Online www etsc tech com Email sales etsc tech com 800 459 9459 or 406 586 1244 TT 406 586 9405 m http ilx custhelp com support ilxlightwave com In Japan Kyosai Technos 424 Shimo Ongata Machi Hachioji Shi Tokyo 192 0154 Japan Phone 81 426 521 388 Fax 81 426 513 270 In China Kyosai Technos Bldg G No 21 Changjiang Road Wuxi National Hi Tech Development Zone Jiangsu P R China Phone 86 510 522 1707 Fax 86 510 522 1679 Email ilx service china kyosaitec co jp LDX 36000 Series xiii Lo 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
130. o wait until the no operation flag is true This is essentially the same as waiting for the OPC flag to become true because the no operations pending flag is used to set the OPC flag bit O of the Standard Event Status Register Commands which change the status of the instrument limits or change its mode step value or status enable registers will not have their OPC flag set until all current writing to non volatile memory has been completed This ensures the OPC flag is never set prematurely Query Response Timing Query responses are evaluated at the time the query request is parsed and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is small 03 10 LDX 36000Series 63 REMOTE OPERATION Command Timing 64 LDX 36000 Series Lightwave CHAPTER 5 COMMAND REFERENCE E E El ii a mH El Ei Li a E El Ei This chapter is a guide to all of the device dependent commands for the LDX 36000 Series High Power Laser Current Source This chapter is divided into two parts The first part contains an overview of the remote commands used by the LDX 36000 current source The second part contains all of the remote commands in alphabetical order The commands which emulate local front panel operation are denoted by the solid box next to the Local label in the upper right corner of the command description
131. oad Rate 30 ms point Power Requirements 100 240 VAC 10 100 240 VAC 10 100 240 VAC 10 220 240 VAC 10 220 240 VAC 10 Maximum Current Draw 7 5 12A 6A 20A 10A 13A 16A Size x W x D 146mm x 483mm x 451mm 5 25 x 19 x 17 75 Weight 11 3 kg 25 Ibs 11 9 kg 26 Ibs 13 6 kg 30 Ibs 16 3 kg 36 Ibs 18 9 kg 41 Ibs Operating Temperature 0 C to 40 C Storage Temperature 40 C to 70 C Safety EN60950 Low Voltage Directive EMC 21CFR 1040 10 Regulatory Compliance CE Certified CE EN61326 1 2006 Basic Requirements Immunity EN55011 1007 Radiated and Conducted Emissions EN61010 1 Safety Requirements Connectors Current Output Hybrid D sub Hybrid D sub Hybrid D sub Bus Bar Bus Bar Measurement DB 9 rear panel Interlocks Terminal block Pulse Trigger Out BNC rear panel Input Output Trigger BNC front panel of setpoint mA ANO OT CoN All values measured after 1 hour warm up and at 25 C Time from 50 of current ramp to set point for step sizes 3A or less From the rising edge of the pulse to the set point At the end of CC 390 output cable in CW mode 10 de rating in QCW mode of full scale over 1 hour all instrument modes RMS electrical noise measured on a resistive load over a 300 KHz bandwidth Maximum output current transient from normal operat
132. ode Current Sources are capable of delivering very high currents up to 125A CW and 220A QCW with a compliance voltage up to 35 Volts These current sources are designed for testing and controlling multiple high power laser diodes with specially designed features such as high set point accuracy low output noise forward voltage and photodiode measurement and an adjustable photodiode reverse bias voltage These current sources also offer many laser diode protection features which protect the laser diode during testing from electrical transients and providing safeguards such as adjustable voltage and current limits Low current overshoot in either CW or QCW mode and closed loop power supply control prevent surge currents in the case of a device failure with multiple diodes connected in series A thermistor based temperature monitor provides additional protection through a programmable temperature limit which can be used to disable the laser output when a temperature limit is exceeded Dual independent interlocks are provided for further laser and operator protection Remote instrument operation is possible on all LDX 36000 Series Current Sources through an IEEE488 GPIB interface All instrument controls and functions are programmable for test sequencing measurements and data handling in automated test systems Synchronization with other measurement or control instruments is possible with an input and output trigger function with programmable delays Mu
133. ommand in either CW or QCW mode not HPulse mode A programmable laser current start point stop oint step size and delay between LDX 36000Series 43 J OPERATION Front Panel Operation steps is entered via a GPIB command Data for photodiode current laser current setpoint and laser forward voltage are saved to on board memory for each laser current step This data can be downloaded from the instrument using a GPIB command The data is erased after data retrieval The mode is intended for single emitter lasers with a forward voltage under 3V During execution of L I V mode the instrument sets the power supply voltage to in CW mode and 4 5V QCW mode and maintains it during the sweep Counter to normal instrument operation the power supply voltage is not monitored during the sweep This reduces sweep time Caution must be used in setting the delay time Delays between steps that are too short may cause inaccuracies in the L I V data as the current or UUT may not have settled when the measurements are executed especially in QCW Pulse mode Some experimentation and comparison with slower L I Vs may be necessary for best results The GPIB commands required for this instrument mode are listed below as well as summarized in Table 5 1 and indivually defined later in Chapter 5 Values for laser current setpoint start stop and step size and delay must be defined through the appropriate GPIB commands before starting the L I V
134. onds have elapsed since the last TIMER query TST Common Self Test xdg Action Performs an internal self test then reports results Parameters None Notes Response 0 test completed with no errors Response non zero test not completed or completed with errors Examples TST response 0 means test completed without errors WAI Wait to Continue Action Parameters Notes Examples COMMON Prevents the instrument from executing any further commands until OPC operation complete status is true None This command can be used to make the instrument wait until an operation is complete before continuing Care should be taken to set the GPIB time out appropriately for use with the WAI command After this command or the Delay command is sent the instrument may receive up to 20 more commands before the wait period is over If more than 20 commands are sent before the delay or wait period is over the additional commands will be ignored and an error E 220 will be generated WAI action wait until OPC status is true LDX 36000 Series 121 COMMAND REFERENCE Command Reference 1227 LDX 36000 Series Lightwave CHAPTER 6 CALIBRATION AND TROUBLESHOOTING iei fa El El El ll mH El E 21 This chapter provides a troubleshooting guide in the event problems or errors encountered while operating the LDX 36000 If this guide does not provide enough information to solve the problem contact I
135. ontrol parameters of laser drive current A laser forward voltage V peak optical power setpoint W and measured optical power from an external photodiode W PD In addition limits for laser current and compliance voltage may be displayed here While adjusting parameters for optical power setpoint photodiode responsivity and thermistor calibration constants Display 1 will show labels identifying each parameter while the value will be shown in Display 2 This will be described in more detail in the sections that follow LDX 36000 Series Lightwave OPERATION Front Panel Operation Indicators immediately below the display will illuminate if a limit or error has been detected The detection of an open circuit or voltage limit will always disable the output Any error codes generated by the instrument will be shown on Display 1 Simultaneous errors will result in only the highest priority error code being displayed Display 2 The right hand display shown in Figure 3 6 shows the parameters of QCW pulsewidth ms pulse rate Hz and duty cycle 96 along with temperature C and photodiode responsivity mA W not annunciated In the cases where DISPLAY 2 one of the above parameters is a BB BB B setpoint being Me eee adjusted the oO NST FREQ INTERLOCK 2 TEMP LIMIT appropriate annunciator will flash _ D Figure 3 7 Display 2
136. optical power from which the current source setpoint is calculated LAS PDBIAS 1 Sets the reverse bias voltage 0 to 15V on an external photodiode connected to pins 1 and 2 of the sense 9 pin connector LAS PDBIAS NONE Returns the PD reverse bias voltage value in volts LAS PPD NONE Returns measured optical power from external calibrated photodiode LAS PW NONE Returns the pulsewidth setpoint in seconds LAS PWF 1 Specifies the pulsewidth to be output QCW mode Duty cycle will change to maintain constant frequency LAS PWP 1 Specifies the pulsewidth to be output QCW mode Frequency will change to maintain constant duty cycle AS STEP 1 Sets laser current setpoint step value LDX 36000 Series 69 5 COMMAND REFERENCE 70 El Remote Command Reference Summary Table 5 1 Remote Command Summary Reference List Continued Sheet 5 of 5 Name Parameters Function LAS STEP NONE Returns the laser current setpoint step value MES 1 Used to enter a string message of up to 16 bits MES NONE Returns previously stored ASCII message OPC NONE Generates the Operation Complete message in the Standard Event Status Register OPC NONE Places an ASCII character 1 into the Output Queue PSC NONE Used to avoid any undesirable service requests PSC NONE Queries the Po
137. output of the laser the photocurrent may be fed into the LDX 36000 so the instrument can display power Details on how to configure the instrument to measure power may be found in this chapter under Power Setpoint The photodiode and laser connections are electrically isolated from ground and each other To measure photocurrent from an external photodiode the photodiode anode and cathode must be connected to two pins on the back panel 9 pin connector labeled Sense Refer to Figure 3 2 for the pinout Shielding of the photodiode connections is recommended to reduce measurement noise A common connection between the laser anode or cathode and photodiode will cause measurement errors This condition should be avoided Grounding Considerations The laser outputs are isolated from chassis ground allowing either output terminal to be grounded at the user s discretion If the output circuit is earth grounded at some point such as through the laser mount care must be taken to avoid multiple earth grounds in the circuit Temperature Measurement Two pins are available on the back panel connector labeled Sense for the measurement of laser mount temperature via a thermistor It is recommended that a 10 kQ thermistor be used as this will provide the best accuracy and resolution for normal operating temperatures of 10 C to 60 C The thermistor should be mounted as close as possible to the laser diode with thermal epoxy for a permanent connection or with
138. 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 container with at least 3 inches 7 5 cm of compressible packaging material on all sides We look forward to serving you even better in the future xiv 1 36000 Series Lightwave CHAPTER INTRODUCTION AND SPECIFICATIONS I B a El mH El El El El mH EJ Bl This chapter is an introduction to the LDX 36000 Series High Power Laser Diode Current Sources The chapter contains first time setup information important safety considerations maintenance information instrument specifications and general LDX 36000 Series information warnine If any of the following symptoms exist or are even suspected remove the LDX 36000 from service Do not use the instrument until trained service personnel can verify safe operation Visible damage e Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements of functions If necessary call ILX Lightwave Customer Service to ensure that all safety features are maintained and functioning correctly Lightwave LDX 36000 Series 1 4 INTRODUCTION AND SPECIFICATIONS Product Overview Product Overview The LDX 36000 Series High Power Laser Di
139. owed QCW Operating Region for 36125 24 iv LDX 36000 Series Lightwave LIST OF FIGURES m L L a a B El Bl Bl El El El a Figure 1 1 LDX 36000 Series Front Panel 3 Figure 1 2 LDX 36000 Series Rear Panel lt 50 3 Figure 1 3 LDX 36000 Series Rear Panel gt 50 3 Figure 2 1 LDX 36000 Series Rear Panel Labels lt 50 21 Figure 2 2 LDX 36000 Series Rear Panel Labels gt 50 A 22 Figure 3 1 Laser and Photodiode Connections 26 Figure 3 2 LDX 36000 Output and Measurement Connector Pin Assignments lt 50A 27 Figure 3 3 LDX 36000 Output and Measurement Connector Pin Assignments gt 50 27 Figure 3 4 External Interlocks 28 Figure 3 5 Adjust 30 Figure 3 6 Display 1 30 Figure 3 7 Display 2 31 Figure 3 8 Selecting Parameters 34 Figure 3 9 Mode Selection 35 Figure 3 10 CW Mode 35 Figure 3 11 QCW Current Ramp Enabling Output 37 Figure 3 12 QCW Current Ramp with Output Enabled 37 Figure 3 13 QCW Mode Box 38 Figure 3 14 Timing Diagram
140. point from which is calculated the current source setpoint value Parameters None Notes The specified output power is NOT a setpoint for constant power mode as is the case for other ILX Lightwave instrumentation It is a constant current mode whose output is back calculated from a specified output optical power and a laser threshold and slope efficiency See Chapter 3 for additional information If the laser threshold value has been set to zero the default value this mode is disabled Examples LAS P LAS LDI response 1 25 3 7 using the laser threshold and slope efficiency values from the previous example 3 73 A would be required to produce the 1 25 W of optical output specified by the setpoint The current source would set its output to 3 7 A 03_10 LDX 36000 Series 7 111 COMMAND REFERENCE Command Reference LASer PPD COMMO FRONT PANEL DEVICE DEPENDENT Action Returns the measured external photocurrent in units of Watts Parameters None Notes If a photodiode responsivity has been entered via the LAS CALPD command the LAS PPD query will return the measured photocurrent in terms of Watts If the responsivity value has been set to zero the query will return a value of zero Watts Examples LAS CALPD 3 5 LAS PPD response 2 75 photodiode responsivity has been set to 3 5 mA W and the measured optical power returned is 2 75 W LAS CALPD 0 LAS PPD LAS IPD response 0 9 625E 3 measured optical power i
141. pper lower case does not matter it is used in this manual to identify optional letters The optional letters must be in the correct sequence Some examples of what works and what does not are shown below Table 4 1 Acceptable Spelling Acceptable Not Acceptable DIS DS Disp dsp Displ dply Displa DSPLY Display disply White Space White space is normally the space character space bar A single white space must separate a command from its parameters or data For example Table 4 2 White Space Acceptable Not Acceptable DELAY 500 DELAY500 To enhance readability one or more white spaces may be used before a comma semicolon or terminator Since the computer normally places the terminator at the end of each command string line this simply means that an extra space character at the end of the command line works acceptably LDX 36000Series 51 REMOTE OPERATION T Command Syntax A query has no space between the mnemonic and the question mark For example Table 4 3 Query Formatting Acceptable Not Acceptable TIMER TIMER Note that too many consecutive white spaces can overflow the 256 byte data I O buffer Terminators A program message terminator identifies the end of a command string These are the valid terminator sequences NL END e lt NL gt lt END gt Many computers terminate with lt CR gt lt NL gt l
142. ps and the output is enabled las out 0 action output current is disabled and output shorting relay is closed 03_10 LDX 36000 Series 109 110 COMMAND REFERENCE Command Reference LASer OUTput COMMO FRONT PANEL DEVICE DEPENDENT Action Returns status of output current Parameters None Notes Although the status of the output is enabled the output may not have reached the setpoint value Examples Las OUT response 0 meaning the output has been disabled devices may be safely disconnected or connected to the output terminals las out response 1 meaning the output has been enabled LASer Power nrf value Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Specifies the output optical power from which is calculated the current source setpoint value An nrf value specifying the output optical power in Watts The specified output power is NOT a setpoint for constant power mode as is the case for other ILX Lightwave instrumentation Through the use of previously entered threshold and slope efficiency values via the LAS CALP command the optical power specified with the LAS P command is used to calculate the laser current required to generate the specified output power This calculated value of current becomes the constant current setpoint See Chapter 3 for additional information If the laser threshold value has been set to zero the default value this mode is disabled LA
143. put pulses Examples LAS DELAYIN 135e 6 action Sets a delay of 135 us between the rising edge of the input trigger and the output current pulse LASer DELAYIN COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the delay in seconds between an input trigger pulse and the rising edge of the output current pulse Parameters None Notes The default value is 0 seconds Examples LAS DELAYIN response 2 5e 3 means the delay between an input trigger and output current pulse will be 2 5 ms LDX 36000 Series Au LX Lightwave COMMAND REFERENCE Command Reference LASer DELAYOUT lt nrf value gt Common FRONT PANEL DEVICE DEPENDENT Action Configures the delay in seconds between an output QCW pulse and the output trigger Parameters One nrf value representing the delay in seconds with a range of 0 to 1 second with a resolution of 1 us Notes The default value is 0 seconds In QCW mode any mode a 10 us trigger pulse is output from the rear panel Trigger Out BNC with each current pulse The trigger pulse is synchronous with the rising edge of the current pulse and may be delayed by the amount specified with the LAS DELAYOUT command Refer to Figure 3 17 for a QCW timing diagram illustrating the relationship between input and output pulses The LDX 36000 cannot determine the pulse period when externally triggered in QCW Trig mode Therefore setting the delay to be longer than the pulse period will lead to unpredictable r
144. r current setpoint A and laser forward voltage V data for each laser setpoint value from 5 00 amps to 25 00 amps 03_10 LDX 36000 Series 105 106 COMMAND REFERENCE Command Reference LASer LIV SET Action Parameters Notes Examples DEVICE DEPENDENT Sets the start current in Amps stop current in Amps step current in Amps and delay time in seconds for fast L IV mode Four lt nrf values gt The first parameter is start current the second parameter is stop current the third parameter is step current the fourth parameter is delay time This command allows the customer to set the parameters to run the fast LIV mode The default values are OA for start current for stop current OA for step current and 200 us for delay time The range for start current is OA to the maximum unit current The range for stop current is OA to the maximum unit current The range for step current is 0 01A to 1A The range for delay time is 100 us to 100 ms To enable the fast LIV output you should set the stop current to be greater than start current set the step current to be at least 0 01A and set the number of LIV points to not more than 1000 The values for start current stop current and step current are rounded to the nearest 0 01A The delay time value is rounded to the nearest 2 us 0 000002 LAS LIV SET 0 0 7 0 0 02 0 003 action sets the start current to 0 0A stop current to 7 0A step current to 0 02A an
145. rement offset 80 Setpoint Current Value slope 36000 80 measurement Send the photodiode measurement calibration to the 36000 using the following command LAS CAL MDI slope offset Set the current on the current source to 50 of full scale 5 mA Retrieve the 36000 s photodiode current measurement with the following command LAS PPD Verify that the photodiode current measurement is within the accuracy specifications of the instrument Lightwave 03 10 CALIBRATION AND TROUBLESHOOTING Thermistor Calibration Thermistor Calibration To perform an accurate thermistor calibration large resistor values are recommended 1 2 10 11 12 13 14 Set the 36000 display to Temperature by sending the following command LAS DIS T Set default thermistor measurement calibration by sending the following commands LAS CAL THERMV1 0 LAS CAL THERMI1 0 After measuring and recording the resistance of a 5K resistor connect it to the two thermistor sense lines located in the DB9 on the back of the 36000 Measure the voltage drop across the 5K resistor with a volt meter Calculate the current passing through the 5K resistor using Ohms Law 12 V R The current passing through the resistor should be 102 4uA Calculate the offset current with the following equation offset 102 40 measured current Send the thermistor current offset to the 36000 using the following command LAS CAL THERMI 1 offset Retriev
146. rmally open close to enable output Interlock 2 Normally open close to enable output Fault Response Time 6 ms GENERAL GPIB Interface IEEE 488 On Board Memory Storage 1000 points On Board Upload Rate 30 ms point Power Requirements 100 240 VAC 10 100 240 VAC 10 100 240 VAC 10 220 240 VAC 10 220 240 VAC 10 Maximum Current Draw 4A 2A 6A 3A 10A 5A 15A 7 5A 20A 10A Size x W x D 146mm x 483mm x 451mm 5 25 x 19 x 17 75 Weight 10 9 kg 24 Ibs 11 9 kg 26 Ibs 11 9 kg 26 Ibs 13 5 kg 30 Ibs 15 2 kg 34 Ibs Operating Temperature 0 C to 40 C Storage Temperature 40 C to 70 C Humidity 20 85 non condensing Safety EN60950 Low Voltage Directive 21CFR 1040 10 Regulatory Compliance CE Certified CE EN61326 1 2006 Basic Requirements Immunity EN55011 1007 Radiated and Conducted Emissions EN61010 1 Safety Requirements Connectors Current Output Hybrid D sub Hybrid D sub Hybrid D sub Bus Bar Bus Bar Measurement DB 9 rear panel Interlocks Terminal block Pulse Trigger Out BNC rear panel Input Output Trigger BNC front panel 10 LDX 36000 Series Lightwave INTRODUCTION AND SPECIFICATIONS
147. s for the second optional parameter time between increments have a practical minimum of 20 LAS DIS LDI LAS STEP 0 3 LAS INC action The current source setpoint is incremented by 300 mA since the current display mode is output current LAS CALP 1 5 75 LAS DIS P LAS STEP 0 1 LAS INC 5 1500 action The output is incremented in a series of 5 100mW steps with an approximate 1 5 second delay between each step The actual current setpoint is varied by back calculating from the optical power by using the threshold and slope efficiency values entered via the LAS CALP command LASer IPD Action Parameters Notes Examples LDX 36000 Series FRONT PANEL DEVICE DEPENDENT Returns the measured external photodiode photocurrent in amperes None The LAS IPD query will return the external photocurrent measurement in any case regardless of any photodiode responsivity value that has been entered using the LAS CALPD command LAS IPD response 2543 means the LDX 36000 is measuring 2 5423 mA from an external photodiode las ipd response 14 means the LDX 36000 is measuring 14 from an external photodiode Lightwave COMMAND REFERENCE Command Reference LASer LDI nrf value Common FRONT PANEL DEVICE DEPENDENT Action Sets the output current setpoint Parameters One lt nrf value gt specifying the output current in Amps Examples LAS LDI 4 5 action sets output current setpoint
148. s i eere ER eee ed ed ERE RO ER da ed E 7 Chapter 2 Safety Electrical 17 Laser Safety 2 552 209551959595 eens 18 Optical Safety ues ERE KE HRS Mm nr d 18 03 10 LDX 36000Series i Ld Safety Features and Compliance to Government Regulations 20 Laser Classification as appropriate 20 Protective Housing as appropriate 20 Laser Emission Indicators as appropriate 20 Operating Controls as appropriate 21 Location of Safety Labels 21 Chapter 3 Operation oases eho ee IA E quor A Ea ks 23 Power Up 5 23 Power On State 24 Connections for General Operation 24 necu DT 25 Laser Current Source Output 26 External InterlockS 28 Forward Voltage Measurement 28 External Photodiode Measurement 29 Grounding Considerations 29 Temperature Measurement
149. s None Notes Display will show pulsewidth setpoint in milliseconds Display is disabled when instrument is in CW mode The output power display is automatically turned off when another display selection is enabled Examples LAS DIS PWF action enables the constant frequency pulsewidth setpoint display on Display 2 LASer DISplay PWF COMMO FRONT PANEL DEVICE DEPENDENT Action Returns the status of the constant frequency pulsewidth setpoint display Parameters None Notes In local operation the status of either PW button is indicated by the annunciator to the right of Display 2 ms will be illuminated when the display is in PW mode Examples LAS DIS PWF response 0 means that the pulsewidth setpoint display on Display 2 is not currently active LAS DIS PWF response 1 means that the pulsewidth setpoint display on Display 2 is currently active LASer DISplay PWP Cc FRONT PANEL DEVICE DEPENDENT Action Sets Display 2 to show constant duty cycle pulsewidth setpoint in QCW Pulse Trig and hard pulse modes Parameters None Notes Display will show pulsewidth setpoint in milliseconds Display is disabled when instrument is in CW mode The output power display is automatically turned off when another display selection is enabled Examples LAS DIS PWP action enables the constant duty cycle pulsewidth setpoint display on Display 2 92 LDX 36000 Series Lightwave COMMAND REFERENCE Command Re
150. s zero Watts due to responsivity being set to zero and measured photocurrent of 9 625 mA assuming the same 2 75 W input as from the example above LASer PW FRONT PANEL DEVICE DEPENDENT Action Returns the QCW pulsewidth setpoint in milliseconds Parameters None Notes Pulsewidth queries are only valid when operating in QCW Pulse QCW Trig or Hard Pulse modes Examples Laser PW response 10 05 means the QCW pulsewidth is set to 10 05 ms LASer PWF nrf value Co FRONT PANEL DEVICE DEPENDENT Action Specifies the constant frequency QCW pulsewidth Parameters nrf value specifying the output current pulsewidth in seconds Notes When the pulsewidth is specified using the LAS PWF command the duty cycle will change as required to maintain constant frequency If the new value for command specific parameter forces the duty cycle or frequency beyond the operational range of the instrument the command specific parameter will be clamped to a minimum or maximum value that still allows operation You may query the command to determine if the setpoint was out of range Changing the pulsewidth is only effective when the instrument is in either QCW Pulse QCW Trig or Hard Pulse modes If an attempt to change pulsewidth is made in any other mode the command will be ignored Examples LAS MODE PULSE LAS F 100 LAS PWF 95e 3 LAS DC action places instrument in QCW Pulse mode with a frequency of 100 Hz and a pulsewidth of 95
151. sident in the error queue are returned up to 10 may be stored Reading the error queue via GPIB clears the error queue Table 6 2 Error Code Classifications Error Code Range Area of Operation E 001 to E 099 Internal Program Errors E 100 to E 199 Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 GPIB Errors E 400 to E 499 Not Applicable E 500 to E 599 Output Control Errors Note Error codes not listed are reserved for future design use 03_10 LDX 36000 Series 135 CALIBRATION AND TROUBLESHOOTING CHAPTER 6 Error Messages 136 Table 6 3 Error Messages Error Code Error Message E 001 Memory allocation failure E 103 DEFINITE LENGTH ARBITRARY BLOCK DIAGRAM length too long E 104 NON DECIMAL NUMERIC PROGRAM type not defined E 105 DECIMAL PROGRAM DATA exponent not valid E 106 DECIMAL PROGRAM digit expected E 124 PROGRAM gt Lookup failed because query command type match failed E 126 Too few or too many program data elements E 201 PROGRAM value out of range E 202 PROGRAM will not convert to valid type E 203 Security violation command is not available without clearance E 205 PROGRAM is not a Boolean value or word E 207 PROGRAM will not convert to a
152. splay Parameters None Notes In local operation the status of the button is indicated by the annunciator to the right of Display 1 A will be illuminated when the display is in mode Examples LAS DIS LDI response 0 means that the output current button is not currently active current setpoint is not being shown on Display 1 LAS DIS LDI response 1 means that the output current button is currently active current setpoint is shown on Display 1 03_10 LDX 36000 Series 89 COMMAND REFERENCE Command Reference LASer DISplay LDV COMMO FRONT PANEL DEVICE DEPENDENT Action Sets Display 1 to show laser forward voltage measurement Parameters None Notes The voltage measurement display is automatically turned off when another display selection is enabled Examples LAS DIS LDV action enables the forward voltage measurement display on Display 1 LASer DISplay LDV Co FRONT PANEL DEVICE DEPENDENT Action Returns the status of the voltage measurement display Parameters None Notes In local operation the status of the V button is indicated by the annunciator to the right of Display 1 V will be illuminated when the display is in V mode Examples LAS DIS LDV response 0 means that the voltage measurement button V is not currently active forward voltage measurement is not being shown on Display 1 LAS DIS LDV response 1 means that the voltage measurement button V is currently active laser
153. ssages manage the bus with functions such as initializing the bus and addressing or unaddressing devices In addition some individual bus lines are designated for this purpose Lightwave LDX 36000 Series 47 REMOTE OPERATION Basic GPIB Concepts Talkers Listeners and Controllers Every GPIB system consists of one or more talkers and listeners and often at least one controller Talkers supply data Listeners accept data A system can consist of simply a talker and listener for example a meter connected to a datalogger or chart recorder Controllers designate talkers and listeners A controller is necessary when the active talkers or listeners must be changed When the controller is a computer it often also designates itself as a listener so it can collect data from designated talkers If there is more than one controller only one can be the Controller In Charge CIC Control can be passed from one computer to another In a multiple controller system there can be one System Controller capable of asserting control becoming CIC GPIB Cable Connections Standard GPIB connectors can be connected together stacked allowing the system to be configured linearly or in a star configuration Ed gt Linear Configuration Ed Star Configuration Figure 4 1 GPIB Cable Connections The GPIB Connector The standard GPIB connector consists of 16 signal lines in a 24 pin stackable
154. sture Class Equipment grounded type 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 8096 RH non condensing Operating temperature range of 0 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 x 7 LDX 36000 Series Lightwave 03 10 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 components Caution Earth Alternating Visible and or refer to ground current invisible laser manual Terminal radiation Caution risk Protective Caution hot Frame or On In position of a bistable push control d The slash lI only denotes that mains on or or 1 0 Off Out position of a bistable push control The circle O only denotes that mains are off of electric Conductor surface chassis shock Terminal Terminal Standby This switch does not fully disconnect the instrument from the power 1 supply LDX 36000 Series xi LG eee WARRANTY ILX LIGHTWAVE CORPORA
155. sweep To initiate the L I V sweep the command LAS LIV OUTPUT ON must be sent to the instrument When the L I V mode is activated the front panel Display 1 will read L I U during the sweep After the laser current setpoint stop value is reached the instrument display will revert back to the original display indicating the sweep is complete Once the sweep is complete the LAS LIV GETMEAS command can be sent to retrieve the sweep data The order of the data is photodiode current in microamps laser current setpoint in amps and laser forward voltage in volts Table 3 5 Automated L I V Mode GPIB Commands Name Parameters Function LASer LIV OUTPUT 1 Enables or disables the L I V instrument mode The instrument will step the setpoint current from the start value to the stop value at increments defined by the step value LASer LIV GETMEAS NONE Returns the LIV data from memory in a group of 25 data points For each step photodiode current laser current setpoint and laser forward voltage values are saved to memory LAS LIV SET 4 Specifies the start current stop current step current and delay time between steps 44 7 LDX 36000 Series Lightwave 03 10 OPERATION Front Panel Operation Pulse Out A TTL level high impedance output is available through a BNC connector on the rear panel of the instrument to externally monitor the pulse width and frequency or duty cycle
156. t END gt Carriage Return New Line EOI carriage return CR is read as white space The LDX 36000 terminates its responses with lt CR gt lt NL gt lt END gt unless the TERM command is used to change it If problems are encountered with GPIB communications the terminator string can sometimes be the cause Refer to the computer s GPIB controller manual for information on configuring its terminator string Command Separators More than one command may be placed in the same command string if each command is separated by a semicolon The semicolon can be preceded by one or more spaces For example LAS LIM I 15 5 las lim v 4 5 LAS CAL P LAS MODE CW LAS ldi 5 5 las out on Parameters Some commands require a parameter The parameter must be separated by at least one white space The syntax symbol nrf value refers to the flexible numeric representation defined by the GPIB standard It means that numbers may be represented in 52 LDX 36000 Series uix Lightwave 03 10 REMOTE OPERATION Command Syntax integer or floating point form or in engineering scientific notation The IEEE 488 2 standard uses the names NR1 NR2 and NR3 respectively to denote integer floating point and scientific notation For example the number twenty may be represented by any of the following ASCII strings Table 4 4 Parameters Numeric Parameter Formats Integer 20 20 NR1 Floating
157. t nrf value gt lt nrf value gt i DEVICE DEPENDENT Action Enters the slope and offset calibration constants for laser voltage limit Parameters Two lt nrf values gt The first parameter is the setpoint slope and the second is the setpoint offset Notes This command allows for calibration and linearization of the laser compliance voltage versus setpoint The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal limitv 1 35122 0 049776 action Adjusts the internal D A calibration to linearize the voltage limit by entering a new slope and offset of 1 35122 and 0 049776 respectively Las Cal LIMITV 1 0 0 0 action Resets the laser voltage limit calibration constants to default values LASer CAL LIMITV DEVICE DEPENDENT Action Returns the current laser voltage limit calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal limitv response 1 545116 0 379247 meaning a slope of 1 545116 and an offset of 0 379247 had been previously entered as part of the calibration process 03_10 LDX 36000 Series 77 COMMAND REFERENCE Command Reference LASer CAL MDI nrf value nrf v
158. t status can be monitored by the LASer EVEnt query If any of the enabled conditions are true Bit 2 of the Status Byte Register will be set The enable registers normally retain their values at power up as they were at power down unless the power on status clear flag is set true for more information see the PSC definition in the IEEE 488 2 specification LAS ENAB EVENT 3 action enables the Status Condition Register so that the current and voltage limit conditions will be summarized in the Status Byte Laser Enable Cond 0100 action enables the status condition register so that when the output is on it will be reported in the Status Byte Register Examples Lightwave COMMAND REFERENCE Command Reference LASer ENABle EVEnt COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the value of the Status Enable Event Register Parameters None Notes The response is the sum of the enabled bits and must be a value between 0 and 65535 as detailed below Laser Event Status Register LASer EVEnt 7 els 4 3 2 1 0 po Laser Curent Limit 3 01 Laser Voltage Limit amp 02 High Temperature Limit a d 03 Laser Open Circuit amp 3 04 Interlock 1 State Change vm 05 Interlock 2 State Change E 06 Temp Sensor Open Logical 07 Temp Sensor Shorted OR 08 Output E 5 09 Bad Steinhart Hart Conversion 10 Hardware Current Limit E 11 AC Power Failure
159. teps until the set point of 220 amps is reached 36 LDX 36000 Series Lightwave OPERATION Front Panel Operation 5 Feb 88 11 39 04 1 5 2868 mV Figure 3 11 QCW Current Ramp Enabling Output The second feature is a current ramp between current steps with the output enabled A current ramp between 10 and a set point of 150A in steps of approximately 10A steps is shown in Figure 3 11 In this example the time between steps is approximately 1 second for a total ramp time of 10 seconds The step size and ramp time is a function of the full scale output current duty cycle and range of the set point step and is controlled by the instrument and cannot be adjusted through the instrument s front panel or GPIB commands 5 Feb B8 12 17 53 1 ls 2 808 V Jii m Figure 3 12 QCW Current Ramp with Output Enabled 03 10 LDX 36000 Series 37 OPERATION Front Panel Operation QCW Pulse Mode QCW Pulse mode is selected by pressing the QCW Mode Select button Figure 3 10 until the PULSE LED is illuminated In this mode all pulse parameters are configurable either via GPIB or from the front panel The pulse parameters of pulsewidth duty cycle percentage and or frequency may be set from the front panel controls s
160. terlock 1 Error 4096 Interlock 2 Error 8192 Temp Sensor Open 16384 Temp Sensor Shorted 32768 The enabled or disabled conditions can be read via the LASer ENABle COND query The condition status can be monitored by the LASer COND query If any of the enabled conditions are true Bit 3 of the Status Byte Register will be set The enable registers normally retain their values at power up as they were at power down unless the power on status clear flag is set true for more information see the PSC definition in the IEEE 488 2 specification LAS ENAB COND 9 action enables the Status Condition Register so that the laser open circuit and current limit conditions will be summarized in the Status Byte Laser Enable Cond HFFFF action enables the Status Condition Register so that any and all of the above conditions will be reported in the Status Byte Register Lightwave COMMAND REFERENCE Command Reference LASer ENAB1le COND COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the value of the Status Condition Enable Register Parameters None Notes The response is the sum of the enabled bits and is detailed below Laser Condition Status Register LASer COND nepapsp2pipo eTe 7 e s 3 2 1 0 oo Laser curent Lini 1 01 Laser Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 Error 05 Interlock 2 Error 06 Temp Se
161. th CDRH The European Community requirements for product safety are specified in the Low Voltage Directive LVD published in 73 23 EEC and amended in 93 98 EEC The Low Voltage Directive requires that lasers comply with the standard EN61010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use and EN60825 1 Radiation Safety of Laser Products Compliance with the LVD requirements is certified by the CE mark Laser Classification as appropriate If the LDX 36000 current source has been provided as part of a complete laser system the system is to be classified as Class IV based on 21 CFR 1040 10 According to the European Community standards the system is classified as Class 4 based on EN 60825 1 In this manual the classification will be referred to as Class 4 If only the LDX 36000 current source has been provided the complete laser system when a laser is connected must be considered Class 4 as well Protective Housing as appropriate No laser is housed within the LDX 36000 Series chassis However any laser connected to the LDX 36000 must be enclosed in a protective housing that prevents human access to radiation in excess of the limits of Class radiation as specified in 21 CFR 1040 10 and Table 1 A EN 60825 1 Laser Emission Indicators as appropriate Adjacent to any laser output aperture on the protective housing dual laser emission indicators are required These indicators must b
162. the GPIB bus automatically puts the instrument in Remote mode The Remote indicator identifies when the controller is in remote operation mode When the instrument is in Remote mode all front panel controls are disabled except for the Local button Pressing the Local button returns the instrument to Local control mode unless a Local Lockout state has been activated by the low level GPIB command LLO from the host computer Local Lockout disables all front panel controls including the Local button until this condition is changed by the host computer In this condition the Remote indicator will flash at 1 Hz to indicate the complete disabling of the front panel The Talk Listen LED will flash when communications are occurring over the GPIB bus For more information on low level interface commands such as LLO refer to the IEEE488 1 specification 50 7 LDX 36000 Series Lightwave Command Syntax REMOTE OPERATION Command Syntax This section describes command syntax and structure This information must be understood in order to effectively write GPIB control programs The syntax of GPIB commands follow the rules defined in the ANSI IEEE 488 2 1987 standard Letters Any GPIB command or query must contain all of the letters which are shown in upper case in the command definition Some of the device dependent commands include additional optional letters shown in lower case in the command reference Chapter 5 Command Reference U
163. the optical power output based on the laser current setpoint Parameters Two nrf values The first parameter is the laser slope efficiency in Watts per Amp and the second parameter is threshold in Amps The slope efficiency range is 0 01 to 20 0 The threshold range is 0 00 to the maximum output possible for the specific model current source being used Notes The default values for slope efficiency and threshold are 0 01 and 0 0 respectively When the default values are entered and Display 1 is configured to show power dashes will be displayed When a nonzero value for threshold is entered the power display will revert to a calculated value based on the current output current setpoint and the threshold and slope efficiency values If the current setpoint is less than the threshold value Display 1 will show LO xx where xx is percentage below threshold Examples las calp 0 45 4 5 action Sets the laser slope efficiency and threshold to 0 45 and 4 5 A respectively for use with Display 1 configured to display optical power LAS CALP 0 01 0 action Disables control of output current based on optical power by setting slope efficiency to 0 01 W A and threshold to 0 A LASer CALP FRONT PANEL DEVICE DEPENDENT Action Returns the values for slope efficiency and threshold in units of Watts per Amp and Amps respectively Parameters None Notes The default values for slope efficiency and threshold are 0 01 and 0 0 resp
164. tions in that events signal an occurrence once and are not reset until the Event Register is queried or the LDX 36000 is powered off Conditions reflect the current state of the instrument and therefore may change many times during operation Querying a Condition Register does not change its contents Figure 4 6 shows the status reporting scheme of the LDX 36000 Series Current Source Each of the registers which may be accessed by a command or query has the appropriate command or query written above or below the register representation For example the Laser Condition Register may be queried via the LASer COND query The condition or event registers are logically ANDed with their respective enable registers These bits are then logically ORed to form a summary message in the status byte for that particular register 60 LDX 36000 Series Lightwave REMOTE OPERATION 4 Status Reporting Piel Standard Event Status Register Laser Condition Status Register ESR LASer COND 0 teppene 9 6 5 4 3 2 1 0 og Laser curent Limit 0 Operation Complete 01 Voltage Limit 1 R
165. to 1000 Hz Resolution 0 1 Hz 0 1 Hz 0 1 Hz 0 1 Hz 0 1 Hz Accuracy 0 1 0 1 0 1 0 1 0 1 03_10 LDX 36000 Series 11 INTRODUCTION AND SPECIFICATIONS OMA uisus 1 Specifications Table 1 2 LDX 36000 Series Specifications Continued Sheet 6 of 8 36010 35 36018 35 36040 30 36070 30 36125 24 Duty Cycle Pulse Mode 0 5 to 2096 0 5 to 2096 0 5 to 20 0 5 to 2096 0 5 to 1096 HPulse Mode 20 to 9096 20 to 9096 20 to 9096 20 to 9096 10 to 9096 Resolution 0 196 0 196 0 196 0 196 0 196 Rise Fall Time Pulse Mode 10 us 10 us 20 us 20 us 20 us HPulse Mode 200 us 200 us 200 us 200 us 200 us Overshoot 296 296 lt 2 lt 2 lt 2 VOLTAGE LIMIT 4 Range 0 38 V 0 38 V 0 33V 0 33 V 0 27V Resolution 100 mV 100 mV 100 mV 100 mV 100 mV Accuracy 1 200mV 1 200mV 1 200mV 1 200mV 1 200mV CURRENT LIMIT Range CW 0 to 10 5A 0 to 18 9A 0 to 42 0A 0 to 73 5A 0 to 131 2A Range QCW 0 to 22 0A 0 to 43 0A 0 to 85 0A 0 to 169 0A 0 to 232A Resolution 10 mA 10 mA 100 mA 10 mA 10 mA Firmware Accuracy Limit 5 30 1964 10mA 30 196 10mA 0 1 20 0 1 80 0 1 120 Hardware Accuracy Limit gt 1 10mA 1 10 1 20 1 80 1 120 EVENT TRIGGERING ALL MODELS Trigger Output TTL Level active high Pulse Width 10 us Delay Programmable Accuracy 2 us 0 05 Ra
166. to 4 5 A las LDI 7 2 action sets output current to 7 2 A LASer LDI COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the output current setpoint Parameters None Notes The LAS LDI query does not return a measurement as is done with other ILX Lightwave instruments It returns a value of the setpoint only Examples LAS LDI 4 5 means the output current setpoint is 4 5 las LDI 7 2 means the output current setpoint is 7 2 LASer LDV nrf value COMMON FRONT PANEL DEVICE DEPENDENT Action Returns the laser forward voltage measurement in Volts Parameters None Notes This measurement is updated approximately once every 600 ms in CW mode and every pulse in QCW mode Expamples 1 response 2 75 means the measured laser forward voltage is 2 75 V 03 10 LDX 36000 Series 103 104 COMMAND REFERENCE Command Reference LASer LIMit I nrf value Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Sets the output current limit One nrf value specifying the laser current limit in Amps The current limit is in effect in all modes of operation las lim i 8 1 action sets the output current limit to 8 1 Amps 5 3 action sets the output current limit to 5 3 Amps LASer LIMit I Action Parameters Notes Examples FRONT PANEL DEVICE DEPENDENT Returns the output current lim
167. to the set point in discrete steps During this time a safe operating voltage is calculated and set by the instrument controller The step size during the ramp is a function of full scale output current and set point current and i through the instrument s fr s controlled by the instrument The ramp cannot be adjusted ont panel or GPIB commands LDX 36000 Series J OPERATION Front Panel Operation QCW Pulsed Mode Setup Quasi CW QCW mode allows the output to be pulsed in three different configurations internally triggered PULSE externally triggered TRIG or hard pulse In QCW Pulse and hard pulse modes all parameters pulsewidth duty cycle and or frequency are set via the front panel or through GPIB In QCW Trig mode pulsewidth is set from the front panel or GPIB and a pulse is output whenever a trigger is received from the front panel Trigger Input BNC Note In all modes TTL pulse of 10 us width will be output from the Trigger Output BNC with every output current pulse The TTL pulse may be delayed from the current pulse by an amount specified by GPIB Note In all QCW modes a TTL pulse will be output from the rear panel Ext Pulse Out BNC with a width matching the output current pulse Table 3 4 summarizes the various QCW modes and how the parameters may be configured Table 3 4 Configuring QCW Parameters QCW Mode Output Current Pulsewidth Duty Cycle Frequency PULSE Front Pa
168. tpoint in Terms of Optical Power Pressing the P Ppp button until the annunciator W is illuminated allows the laser drive current to be set in terms of optical power In this mode the setpoint is entered in terms of optical power and the instrument back calculates the required drive current from the laser s threshold and slope efficiency values Note This mode is NOT a constant power mode The instrument is still operating in constant current mode the setpoint is simply being shown in a different form When the power setpoint is adjusted the A annunciator flashes to indicate that the laser current setpoint is being changed Refer to Figure 3 12 to see graphically how current setpoint is determined 03 10 LDX 36000 Series 41 OPERATION Front Panel Operation E Threshold 3 A 9 Slope Efficiency 1 23 W A Required Output 6 5 W Output Power W 4E Calculated Drive Current 8 3 A Laser Current A Figure 3 15 Determining Output Current Setpoint For this mode to operate correctly the laser s threshold and slope efficiency must be correctly entered via the CAL P parameters Pressing the Parameter Select button Figure 3 9 until the CAL P LED is illuminated will display P1 in Display 1 and a slope efficiency value with undisplayed units of W A in Display 2 Pressing the Parameter Set button allows the slope efficiency value to be changed with the Adjust knob Pressing the Parameter Select button ag
169. tus Enable Action Enables bits in the Standard Event Status Enable Register Parameters The value must be between 0 and 255 Notes Bit 5 of the Status Byte Register is set if any enabled conditions are true Setting Bit 0 allows for generation of service requests from overlapped commands as previous operations complete This may be useful for ensuring that an operation is complete before starting a measurement Standard Event Status Register ESR 7 e s 4 s 2 1 0 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request 7 Power On Logical OR Standard Event Status Enable Register ESE lt nrf gt ESE Examples ESE 40 action Sets the Standard Event Status Enable Register to enable Bit 5 of the Status Byte Register if a device dependent error or a command error occurs 40 23 25 03 10 LDX 36000Series 73 COMMAND REFERENCE Command Reference ESE Event Action Parameters Notes Examples COMMON Status Enable Query Requests the value of the Standard Event Status Enable Register None Bit 5 of the Status Byte Register is set if any enabled conditions are true Response is the sum of the enabled bits and must be a value between 0 and 255 Standard Event Status Register ESR 5 Command Error Logical lt EM OR 6 Us
170. ty 5 Secure the packing box with fiber reinforced strapping tape or metal bands 6 Send the instrument transportation 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 the 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 xii 7 LDX 36000 Series Lightwave 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 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 In the United States ONNES BU Or mail to ILX Lightwave Corporation Box 6310 Bozeman Mo
171. um the instrument s model number and serial number Examples IDN response ILX Lightwave 3650 36501234YN 1 2 LASer CAL LDI nrf value nrf value DEVICE DEPENDENT Action Enters the slope and offset calibration constants for laser current setpoint Parameters Two nrf values The first parameter is the setpoint slope and the second is the setpoint offset Notes This command allows for calibration and linearization of the laser output current versus setpoint The complete calibration procedure is outlined in Chapter 6 Default values for slope and offset are 1 and 0 respectively Examples las cal ldi 1 0046 0 00426 action Adjusts the internal D A calibration to linearize the output by entering a new slope and offset of 1 0046 and 0 00426 respectively Las Cal LDI 1 0 0 0 action Resets the laser current setpoint calibration constants to default values LASer CAL LDI DEVICE DEPENDENT Action Returns the current laser current setpoint calibration constants stored within the instrument Parameters None Notes Two values are returned by this query a slope and offset value respectively This command is used to verify successful calibration by reading back the stored constants This procedure is outlined in Chapter 6 Examples las cal ldi response 1 545116 0 379247 meaning a slope of 1 545116 and an offset of 0 379247 had been previously entered as part of the calibration process 03_10 LDX 36000 Ser
172. ure display AS ENAB COND 1 Sets the Laser Condition Status Enable Register AAS ENAB COND NONE Returns the value of the Laser Condition Status Enable Register AAS ENAB EV 1 Sets the Laser Event Status Enable Register AS ENAB EVE NONE Returns the value of the Laser Event Status Enable Register AS ENAB OUTOFF 1 Sets the Laser Output Off Enable Register AS ENAB OUTOFF NONE Returns the value of the Laser Output Off Enable Register AS EVE NONE Returns the value of the Laser Event Status Register LAS F 1 Specifies the frequency to be used in QCW mode LAS F NONE Returns the QCW mode frequency setpoint LAS INC 2 Increases the laser current setpoint value by one or more steps LAS IPD NONE Returns the measured external photodiode photocurrent jAS LDI 1 Specifies the laser current source setpoint value AAS LDI NONE Returns the laser current source setpoint value LAS LDV NONE Returns the measured laser voltage value LAS LIM I 1 Sets the laser current source limit LAS LIM I NONE Returns the laser current source limit LAS LIM T 1 Sets the laser high temperature limit 68 LDX 36000 Series Lightwave 03 10 COMMAND REFERENCE Remote Command Reference Summary Table 5 1 Remote Command Summary Reference List Continued Sheet 4 of 5
173. ut Off Enable Register determines which conditions and events can cause the laser current output to be turned off This register is configured a manner which is similar to the status reporting registers However its output is not reported in the Status Byte Register Rather it is directly tied to hardware which controls the output switching The events and conditions which may be set to cause the laser output to be turned off are shown in Figure 4 7 The default factory settings are shown in Table 4 9 The settings preceeded by an asterisk are hard coded and cannot be changed These settings are not affected by the PSC Power On Status Clear command Table 4 9 Default Output Off Register Settings Bit Reference Laser Output Off Register Logical k PP 8 5 2 8 v e s 4 Turn Output Laser Output Off Enable Register LAS ENABle OUT OFF nrf LAS ENABle OUT OFF 00 Laser Current Limit 01 Laser Voltage Limit 02 High Temp Limit 03 Laser Open Circuit 04 Interlock 1 Open 07 Temp Sensor Shorted 08 Output Enabled 09 Bad S H Conversion 10 Hw Current Limit 11 AC Power Failure 12 Laser Open Circuit 2 13 Power Supply Failure 14 Power Supply Voltage Limit 15
174. wer On Status Clear Flag PUD 1 Stores Programmable User Data into instrument PUD NONE Returns the Programmable User Data R NONE Returns the measured thermistor resistance RAD 1 Sets the radix type for numerical data Decimal binary octal or hexadecimal RAD NONE Returns the radix type used for numerical data RCL 1 Used to recall a stored setup configuration RST NONE Forces a device reset SAV 1 Saves the current setup configuration SECUR Used to gain access to protected data SRE 1 Sets the bits in the Service Request Enable Register to allow generation of user selectable service requests SRE NONE Returns the current contents of the Service Request Enable Register STB NONE Returns the current contents of the Status Byte Register Returns the currently measured temperature ERI 1 Used to add a carriage return to the device terminator ERM NONE Returns the status of the TERM command IME NONE Returns the elapsed time since the instrument as last powered up IMER NONE Returns the elapsed time since the instrument was last reset TST NONE Initiates an internal self test and returns a response when complete WAI NONE Prevents executing any further commands until the No Operation Pending flag is true LDX 36000 Series Lightwave COMMAND REFERENCE Command Reference Command Reference The following pages contain a reference for both common and devide dependent commands of the LDX 3600
175. when the event status is read or the CLS command is issued Examples LAS COND response 257 means that the output is on and in current limit Radix Hex Laser Cond response H90 means that the temperature sensor is shorted and Interlock 1 is open 03 10 LDX 36000Series 83 84 COMMAND REFERENCE Command Reference LASer DC lt nrf value gt COMMON FRONT PANEL DEVICE DEPENDENT Action Enters the duty cycle to be used in QCW Pulse or Hard Pulse modes Parameters One nrf value representing the duty cycle percentage Notes The range for duty cycle values depends on instrument mode pulse or hard pulse and model When this value is changed the frequency will automatically change to accommodate the new duty cycle value and existing pulsewidth Duty cycle is defined as the ratio of pulsewidth to pulse period as a percentage In QCW Trig mode or CW mode the command will have no effect on the output If the new value for command specific parameter forces the duty cycle or frequency beyond the operational range of the instrument the command specific parameter will be clamped to a minimum or maximum value that still allows operation You may query the command to determine if the setpoint was out of range Examples LAS DC 10 3 action Sets output duty cycle to 10 3 LASer DC Common FRONT PANEL DEVICE DEPENDENT Action Returns the duty cycle to be used in QCW Pulse mode or Hard Pulse mode Param
176. xpected Las LDI5 4 dis Space missing between LDI command and the parameter value 5 4 03_10 LDX 36000 Series 55 REMOTE OPERATION 488 2 Command Commands IEEE 488 2 Command Commands The IEEE 488 2 Command Commands and Queries are distringuished by the which begins each mnemonic The diagrams below show the syntax structure for common commands common command queries and common commands with numeric data required OTO Common Command Common Command Query lt decimal lt white space gt numeric program data gt Common Command with Numeric Data Figure 4 5 Common Command Diagrams Numeric data is required with PSC 1 on 0 off 0 10 see front panel Recall funcation SAV 1 10 see front panel Save function ESE 0 255 see Figure 4 2 GPIB Connector diagram and PUD for factory use only 56 LDX 36000 Series Lightwave REMOTE OPERATION IEEE 488 2 Command Commands de TEM All the IEEE 488 2 Common Commands supported by the LDX 36000 are listed in Table 4 7 Table 4 7 LDX 36000 IEEE Common Commands CAL CLS ESE 5 ESR IDN OPC 5 5 PUD RST STB TST WAI See Chapter 5 Command Reference for descriptions of all commands including common commands supported by the LDX 36000 03_10 LDX 36000 Series 57 prer 4

LDX-36000 Commonly Used Commands

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