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Newport ILX Lightwave LDC-3916330 Series User Manual

Laser diode current source modules
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Summary of Contents for Newport ILX Lightwave LDC-3916330 Series

  • Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Visit our website - Click HERE...
  • Page 2 User’s Guide Laser Diode Current Source Modules LDC-3916330 Series ILX Lightwave Corporation · 31950 Frontage Road · Bozeman, MT, U.S.A. 59715 · U.S. & Canada: 1-800-459-9459 · International Inquiries: 406-556-2481 · Fax 406-586-9405 · ilx.custhelp.com www.ilxlightwave.com 70028104 June 2013...
  • Page 4 TA B L E O F C O N T E N T S ABLE OF ONTENTS Safety Information and the Manual ....... . .vii General Safety Considerations .
  • Page 5 TA B L E O F C O N T E N T S Entering the Laser Channel Setup Menu ......13 Setting the Mode of Control .
  • Page 6 TA B L E O F C O N T E N T S Chapter 4 Command Reference LDC-3916330 Series Device-Dependent Command Reference ... 38 Chapter 5 Troubleshooting Calibration Overview ..........75 Recommended Equipment .
  • Page 7 TA B L E O F C O N T E N T S LDC-3916330 Series...
  • Page 8 L I S T O F F I G U R E S IST OF IGURES Figure 2.1 Common Laser Cathode - Photodiode Cathode ..8 Figure 2.2 Common Laser Cathode - Photodiode Anode ..9 Figure 2.3 Common Laser Anode - Photodiode Cathode .
  • Page 9 L I S T O F F I G U R E S LDC-3916330 Series...
  • Page 10 AFETY AND ARRANTY NFORMATION 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.
  • Page 11 S A F E T Y S Y M B O L S AFETY YMBOLS 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: •...
  • Page 12 WA R R A N T Y ARRANTY ILX LIGHTWAVE CORPORATION 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.
  • Page 13 WA R R A N T Y Comments, Suggestions, and Problems To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support. You may contact us in whatever way is most convenient: Phone .
  • Page 14 C H A P T E R NTRODUCTION AND PECIFICATIONS  This chapter is an introduction to the LDC-3916330 Series Laser Diode Current Source Modules for use in the LDC-3908, LDC-3916, and LDC-3926 LD Controller Mainframes. It covers model numbers LDC-3916332 500 mA Dual Current Source Module, LDC-3916334 1A Dual Current Source Module, and LDC-3916338 3A Single Current Source Module.
  • Page 15 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Product Overview • The NOTES heading gives information to the user that may be beneficial in the use of the instrument and to the devices being tested.
  • Page 16 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Installing the LDC-3916330 Series Laser Diode Controller Module Insert the module into the desired slot from the rear of the mainframe.
  • Page 17 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications Specifications The following specifications are for when the modules are used in the LDC-3916 16-Channel Laser Diode Controller Mainframe or the LDC-3908 8-Channel Laser Diode Controller Mainframe.
  • Page 18 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications CURRENT SOURCE NOTES: 1.
  • Page 19 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications  LDC-3916330 Series...
  • Page 20 C H A P T E R PERATIONS This chapter introduces you to the operation of the LDC-3916330 Series Dual LD Current Source's control functions. It offers instructions for connecting your lasers to the current sources. This chapter also contains step by step procedures that teach you how to operate your module in Constant Current Mode or Constant Power Mode.
  • Page 21 O P E R A T I O N S C H A P T E R Connecting to the Laser Current Source Connecting to the Laser Current Source When connecting your laser diode or any other sensitive devices to the LDC- 3916330 Series Dual Current Source Modules, we recommend that the instrument be powered up and the LASER outputs be off.
  • Page 22 O P E R A T I O N S C H A P T E R Connecting to the Laser Current Source Module OUTPUT Bias P. D. L. D. Earth Ground Figure 2.2 Common Laser Cathode - Photodiode Anode Module OUTPUT Bias...
  • Page 23 O P E R A T I O N S C H A P T E R Connecting to the Laser Current Source Connectors on the rear panel of the LDC-3916330 Series modules provide laser anode and cathode, photodiode anode and cathode, chassis ground, interlock and laser forward voltage connections.
  • Page 24 O P E R A T I O N S C H A P T E R Connecting to the Laser Current Source (4,5,8,9) must be connected for the module to operate. See Tech Note #TN3916-2 for more information on 4-wire Voltage Sense. Photodiode Connections Many laser diode modules contain an internal photodiode that monitors the back- facet emission of the laser.
  • Page 25 O P E R A T I O N S C H A P T E R Operating the Laser Current Source from the Front Panel Operating the Laser Current Source from the Front Panel The various laser current source control parameters can be set the same for all channels via the All Chnl menu which is accessed through the MAIN menu.
  • Page 26 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Current (I) Mode Operating a Laser in Constant Current (I) Mode Suppose you have an LDC-3916330 Series Module and you want to run the instrument in Constant Current low bandwidth mode (Ilbw), with a set point of 150 mA, a current limit of 175 mA, and a voltage limit of 6 volts.
  • Page 27 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Current (I) Mode Setting the Mode of Control Select the Mode parameter by pushing the (DISPLAY) UP/DOWN ARROW keys until the Mode parameter is highlighted.
  • Page 28 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Current (I) Mode Setting the Constant Current Value Next, select the Iset parameter on the setup menu using the (DISPLAY) UP/DOWN ARROW keys.
  • Page 29 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Current (I) Mode Enabling the Modulation Input Change the display to LAS p.3 of the laser setup menu to set the next parameter. Do this by pushing the DOWN soft key (F4) twice.
  • Page 30 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode Operating a Laser in Constant Power (P) Mode Suppose you want to operate a 3 mW laser in constant optical power at 1 mW. The LDC-3916330 Series Controller Modules allow you to operate the instrument current source drivers in Constant Optical Power (P) mode.
  • Page 31 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode For the 3916338 module, push the display down arrow soft key (F4) to enter page 1 of the laser setup menu.
  • Page 32 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode Setting the Current Limit Select the laser current limit (Ilim) parameter by pushing the (DISPLAY) UP/DOWN ARROW keys until the Ilim value is highlighted with the cursor.
  • Page 33 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode voltage exceeds the Vlim value. The Vlim value should be set slightly above the operating voltage of the laser diode to provide maximum protection. Note: Be sure to push the ENTER key within three seconds after using the keypad to adjust any numeric values in the setup menus;...
  • Page 34 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode Setting the Responsivity Value (CalPD) The correct responsivity value (CalPD) must be set for the constant power mode to operate properly.
  • Page 35 O P E R A T I O N S C H A P T E R Operating a Laser in Constant Power (P) Mode Constant Power Mode if CalPD is Unknown If you do not know the correct photodiode responsivity (CalPD) value, the LDC-3916330 Series Modules can still drive your laser at a constant light power.
  • Page 36 O P E R A T I O N S C H A P T E R Conditions Which Will Automatically Shut Off the Laser Output Conditions Which Will Automatically Shut Off the Laser Output When the LASER output is off, an internal short is placed across the LASER output.
  • Page 37 O P E R A T I O N S C H A P T E R Laser Error Indicators Laser Error Indicators The LDC-3916330 Series Laser Diode Current Source Controllers indicate general LASER operational error conditions. When an error occurs, the Error Indicator Code will appear on the status page, the Chan page, or the LAS setup pages for the respective current source.
  • Page 38 C H A P T E R EMOTE PERATIONS Everything you can do from the front panel can also be done remotely and in some cases with more flexibility. For example, in remote mode, you can enable or disable conditions that will cause the laser current source or the TEC controller to automatically shut off.
  • Page 39 R E M O T E O P E R A T I O N S C H A P T E R LDC-3916330 Series Laser Diode Controller Command Set (root) :LASER1 (or :LASER2) :ENAB :LIM :MODE :SET :CAL MODERR? :BIAS ALLCOND? *CAL?
  • Page 40 R E M O T E O P E R A T I O N S C H A P T E R LDC-3916330 Series Laser Diode Controller Often Used Commands LDC-3916330 Series Laser Diode Controller Often Used Commands Table 3.1 LDC-3916330 Series Often Used Commands NAME PARAMETERS FUNCTION...
  • Page 41 R E M O T E O P E R A T I O N S C H A P T E R Status Reporting Status Reporting Refer to the LDC-3916 Laser Diode Controller Instruction Manual, Chapter 3 "Operating in Remote Control" for information on standard status structures, mainframe-related commands, and for understanding the Operation Complete definition.
  • Page 42 R E M O T E O P E R A T I O N S C H A P T E R Status Reporting LASER1 Condition Status Register LASER1:COND? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND...
  • Page 43 R E M O T E O P E R A T I O N S C H A P T E R Status Reporting LASER1 Event Status Register LASER1:EVEnt? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND...
  • Page 44 R E M O T E O P E R A T I O N S C H A P T E R Status Reporting Output Off Registers The Output Off Enable Registers allow you to determine which conditions and events in the TEC and LASER controllers can cause their outputs to be turned off.
  • Page 45 R E M O T E O P E R A T I O N S C H A P T E R Status Reporting LASERn Output Off Register 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise Turn LOGICAL OR...
  • Page 46 R E M O T E O P E R A T I O N S C H A P T E R Error Messages Error Messages This section contains descriptions of the errors which are specific to the LDC-3916330 Series modules. These are the error codes that are returned from the "MODERR?"...
  • Page 47 R E M O T E O P E R A T I O N S C H A P T E R Error Messages Error Code Explanation E-401 Interlock Open forces Laser 1 output off. E-403 Laser 1 Voltage Limit forces output off. “Open Circuit” error. E-404 Laser 1 Current Limit forces output off.
  • Page 48 C H A P T E R OMMAND EFERENCE This chapter is a guide to all of the device-dependent commands for the LDC-3916330 Series Dual LASER Diode Controller module. The first part contains an overview of the remote commands used by the LDC-3916330 Series. The second part contains all of the LDC-3916330 Series commands in alphabetical order.
  • Page 49 C O M M A N D R E F E R E N C E C H A P T E R Table 4.1 GPIB Command Summary Reference List Name Parameters Function LAS:BIAS Enables or disables the -5 volt photodiode bias LAS:BIAS? NONE Returns the status of the photodiode bias control...
  • Page 50 C O M M A N D R E F E R E N C E C H A P T E R Table 4.1 GPIB Command Summary Reference List Name Parameters Function LAS:MODE? NONE Returns the mode, I (current), IHBW (high bandwidth), P (optical power) or MDI (constant monitor current) LAS:MODE:IHBW NONE...
  • Page 51 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LDC-3916330 Series Device-Dependent Command Reference This section contains all of the device-dependent commands for the LDC-3916330 Series Laser Current Source Modules, listed in alphabetical order.
  • Page 52 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:BIAS OMMON EVICE EPENDENT RONT ANEL The LASERn:BIAS command turns the selected channel’s laser photodiode bias on or off.
  • Page 53 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:CALPD OMMON EVICE EPENDENT RONT ANEL The LASERn:CALPD command sets the selected module’s laser photodiode feedback responsivity (the CAL PD parameter) <white <nrf...
  • Page 54 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:CAL: OMMON EVICE EPENDENT RONT ANEL The LASERn:CAL: command path is used to get to the selected module’s laser calibration commands.
  • Page 55 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:CAL:DEFAULT OMMON EVICE EPENDENT RONT ANEL The LASERn:CAL:DEFAULT command sets all of the selected module’s laser calibration constants to default values.
  • Page 56 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:CAL:LDV OMMON EVICE EPENDENT RONT ANEL The LASERn:CAL:LDV command is used to initiate the calibration procedure for the selected module’s laser voltage measurement.
  • Page 57 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:CAL:MEAS OMMON EVICE EPENDENT RONT ANEL The LASERn:CAL:MEAS command is used to enter measured values during the selected module’s laser calibration procedure.
  • Page 58 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:COND? OMMON EVICE EPENDENT RONT ANEL The LASERn:COND? query returns the contents of the selected module’s laser condition status register.
  • Page 59 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:DEC OMMON EVICE EPENDENT RONT ANEL The LASERn:DEC command decrements the selected module’s laser constant current set point by one or more steps.
  • Page 60 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:COND OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:COND command sets the selected module’s laser condition status enable register.
  • Page 61 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:COND? OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:COND? query returns the value of the selected module’s laser condition status enable register.
  • Page 62 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:EVEnt OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:EVEnt command sets the selected module’s laser event status enable register.
  • Page 63 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:EVEnt? OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:EVEnt? query returns the contents of the selected module’s laser event status enable register.
  • Page 64 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:OUTOFF OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:OUTOFF command sets the selected module’s laser output off enable register.
  • Page 65 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:ENABle:OUTOFF? OMMON EVICE EPENDENT RONT ANEL The LASERn:ENABle:OUTOFF? query returns the contents of the selected module’s laser output off enable register.
  • Page 66 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:EVEnt? OMMON EVICE EPENDENT RONT ANEL The LASERn:EVEnt? query returns the contents of the selected module’s laser event status register.
  • Page 67 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:INC OMMON EVICE EPENDENT RONT ANEL The LASERn:INC command increments he selected module’s laser constant current set point by one or more steps.
  • Page 68 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:LDI? OMMON EVICE EPENDENT RONT ANEL The LASERn:LDI? query returns the value of the selected module’s measured laser current LASERn Parameters...
  • Page 69 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:LIMIT: OMMON EVICE EPENDENT RONT ANEL The LASERn:LIMit: command path is used to access the selected module’s limit commands.
  • Page 70 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:LIMit:V OMMON EVICE EPENDENT RONT ANEL The LASERn:LIMit:V command sets the selected module’s laser voltage limit (VLim) value.
  • Page 71 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:LIMit:MDP OMMON EVICE EPENDENT RONT ANEL The LASERn:LIMit:MDP command sets the laser optical power limit. If the measured optical power exceeds this value, the current source output will be shut off, and a power limit error will be generated.
  • Page 72 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MDI OMMON EVICE EPENDENT RONT ANEL The LASERn:MDI commands sets the selected module’s laser monitor photodiode current (MDI) setpoint.
  • Page 73 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MDP OMMON EVICE EPENDENT RONT ANEL The LASERn:MDP command sets the value of the selected module’s laser optical power set point, in mW.
  • Page 74 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MODE? OMMON EVICE EPENDENT RONT ANEL The LASERn:MODE? query returns the selected module’s laser control mode. LASERn MODE Parameters...
  • Page 75 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MODE:IHBW OMMON EVICE EPENDENT RONT ANEL The LASERn:MODE:IHBW command selects high bandwidth constant current mode for the selected module’s laser current source.
  • Page 76 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MODE:MDI OMMON EVICE EPENDENT RONT ANEL The LASERn:MODE:MDI command selects constant monitor diode current (MDI) mode for the selected module’s laser current source.
  • Page 77 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:MODulation OMMON EVICE EPENDENT RONT ANEL The LASERn:MODulation command turns the selected module’s laser modulation switch on or off.
  • Page 78 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:OUTput OMMON EVICE EPENDENT RONT ANEL The LASERn:OUTput command turns the selected module’s laser output on or off. <white <nrf LASERn...
  • Page 79 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:SET: OMMON EVICE EPENDENT RONT ANEL The LASERn:SET: command path is used to access the selected module’s laser set point queries.
  • Page 80 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:SET:MDP? OMMON EVICE EPENDENT RONT ANEL The LASERn:SET:MDP? query returns the selected module’s monitor PD power set point value.
  • Page 81 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:STEP? OMMON EVICE EPENDENT RONT ANEL The LASERn:STEP? query is used to read back the selected module’s laser setpoint step size.
  • Page 82 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:SYNCLDV? OMMON EVICE EPENDENT RONT ANEL The LASERn:SYNCLDV? query returns the value of the selected channel’s measured laser voltage, in volts.
  • Page 83 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LASERn:SYNCMDP? OMMON EVICE EPENDENT RONT ANEL The LASERn:SYNCMDP? query returns the value of the selected channel’s measured optical power, in mW.
  • Page 84 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference STATMENU:LINEn? OMMON EVICE EPENDENT RONT ANEL The STATMENU:LINEn? query returns the name of the measurement that is currently being displayed on line n of the status menu.
  • Page 85 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference STATMENU:LINEn:LDI OMMON EVICE EPENDENT RONT ANEL The STATMENU:LINEn:LDI command sets the measurement that is to be displayed on line n of the status menu to LASER diode current (LDI).
  • Page 86 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference STATMENU:LINEn:VF OMMON EVICE EPENDENT RONT ANEL The STATMENU:LINEn:VF command sets the measurement that is to be displayed on line n of the status menu to laser diode forward voltage (VF).
  • Page 87 C O M M A N D R E F E R E N C E C H A P T E R LDC-3916330 Series Device-Dependent Command Reference LDC-3916330 Series...
  • Page 88 C H A P T E R ROUBLESHOOTING This chapter describes calibration of your LDC-3916330 Series Dual Laser Diode Controller Module. Descriptions of the required test instruments, calibration conditions, and the detailed procedures for calibration of the instrument's Temperature Controller and the Laser Diode Current Source are included. A troubleshooting guide is also offered for some of the more common failure symptoms.
  • Page 89 T R O U B L E S H O O T I N G C H A P T E R Calibration Overview table may be used if the specifications meet or exceed those listed. Table 5.1 Recommended Test Equipment Description Mfg./Model Specification...
  • Page 90 T R O U B L E S H O O T I N G C H A P T E R Calibration Overview Table 5.3 Components for I Calibration Circuit COMPONENTS FOR PHOTODIODE CURRENT (I ) CALIBRATION CIRCUIT 49Ω resistor, 1% 1/4W 100Ω...
  • Page 91 T R O U B L E S H O O T I N G C H A P T E R Local Calibration of the Laser Current Source Local Calibration of the Laser Current Source There are three calibration adjustments for each current source of the 3916330 Series Current Source Module.
  • Page 92 T R O U B L E S H O O T I N G C H A P T E R Local Calibration of the Laser Current Source After you have entered the second value, the internal cal procedure calibrates the LD current measurement circuit, the LD current source for both low and high bandwidths, and the LD current limit circuit.
  • Page 93 T R O U B L E S H O O T I N G C H A P T E R Local Calibration of the Laser Current Source Laser Forward Voltage Measurement Calibration The following procedure is for calibrating the LASER forward voltage (LDV) measurement circuits.
  • Page 94 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module Remote Calibration of the LDC-3916330 Dual Current Source Module The 3916330 Controller Modules can be calibrated remotely via the GPIB Interface.
  • Page 95 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module Check to see if the internal cal procedure is ready for the measurement. Send the following query to the module: LASERn:CAL:STATUS? The cal procedure is ready for a measurement if it returns the value "1".
  • Page 96 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module IPD Current Calibration The following procedure is for remotely calibrating the LASER I (photodiode monitor) measurement circuit.
  • Page 97 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module Enter the measured current in µA by sending the following command: LAS:CAL:MEAS (current in µA) e.g.
  • Page 98 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module Laser Forward Voltage Measurement Calibration The following procedure is for remotely calibrating the laser forward voltage measurement circuit.
  • Page 99 T R O U B L E S H O O T I N G C H A P T E R Remote Calibration of the LDC-3916330 Dual Current Source Module After you have entered the second measured voltage, the internal calibration procedure will perform the calibration for the laser forward voltage measurement circuit.
  • Page 100 T R O U B L E S H O O T I N G C H A P T E R Troubleshooting Guide Troubleshooting Guide This section is a guide to troubleshooting the 3916330 Series Controller Modules. Some of the more common symptoms are listed here, and the appropriate troubleshooting actions are given.
  • Page 101 T R O U B L E S H O O T I N G C H A P T E R Troubleshooting Guide Unable to adjust output Make sure that the ISET adjust parameter is highlighted. Check the ILIMIT parameter; it should be set above 0 and above the laser operating current.