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ILX Lightwave LDX-3200 Series User Manual

Precision current source
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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 User’s Guide Precision Current Source LDX-3200 Series ILX Lightwave Corporation P. O. Box 6310 Bozeman, MT, U.S.A. 59771 · · · U.S. & Canada 1-800-459-9459 · International Inquiries: 406-586-1244 Fax 406-586-9405 · E-mail: support@ilxlightwave.com www.ilxlightwave.com 7002820200_7/01 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 4 • Prolonged storage under adverse conditions • Failure to perform intended measurements or functions If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for service or repair to ensure that safety features are maintained (see the contact information on page vi).
  • Page 5 Technical specifications including electrical ratings and weight are included within the manual. See the Table of Contents to locate the specifications and other product information. The following classifications are standard across all ILX Lightwave products: • Indoor use only • Ordinary Protection: This product is NOT protected against the harmful ingress of moisture.
  • Page 6 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to: Obtain a Return Authorization number (RA) from ILX Customer Service. Attach a tag to the instrument identifying the owner and indicating the required service or repair.
  • Page 7 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 8: Table Of Contents

    Chapter 6 Calibration and Troubleshooting Guide Introduction ................................1 Local Calibration of the LDX-3200 Series Current Source....................2 Remote Calibration of the LDX-3200 Series Current Source..................6 Troubleshooting Guide ..............................10 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 9 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 10 CHAPTER 1 INTRODUCTION TO THE LDX-3200 SERIES Introduction Product Overview Initial Inspection Installing Your LDX-3200 Precision Current Source Grounding requirements AC Line Power Requirements GPIB Connector The GPIB Address Tilt-Foot Adjustment Operating the LDX-3200 Precision Current Source Maintenance How to Obtain Repair Services...
  • Page 11 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 12: Chapter 1 Introduction To The Ldx-3200 Series

    If necessary, return the LDX-3200 to ILX Lightwave for service and repair to ensure that safety features are maintained. In order to get the most out of your ILX Lightwave product, we ask that you direct any product operation or service related questions or comments to Customer Support at 1-800-459-9459 (USA and Canada), 406-586-1244 (International) or by fax at 406-586-9405.

  • Page 13: Safety Symbols And Terms

    Instrument Power On PRODUCT OVERVIEW The LDX-3200 Series instruments are precision current sources. They provide a high stability output with a fully redundant current limit and multiple laser protection features. The LDX-3200 Series' fast, sophisticated GPIB option lets you automate your experiment.

  • Page 14: Installing Your Ldx-3200 Precision Current Source

    The IEEE 488.2 GPIB interface connector is located on the rear panel, directly above the power input module and fuse. See Figure 1.2, LDX-3200 Series Rear View. Attach the GPIB cable to the 24-pin connector located on the rear panel.

  • Page 15: Tilt-Foot Adjustment

    Tilt-Foot Adjustment The LDX-3200 Series Precision Current Source comes standard with folding front legs and two rear feet for use as a bench top instrument. Extending the front feet so that the instrument front panel sits up makes it easier to view the LED displays.

  • Page 16: Maintenance

    This section covers information on how to obtain repair services. WARNING Potentially lethal voltages exist within the LDX-3200 Series Precision Current Source. To avoid electric shock, do not perform any of the maintenance on the instrument unless you are qualified to do so. Qualified service personnel are required to wear protective eyeglasses and anti-static wristbands while working on the LDX-3200 Series Precision Current Source circuit boards.

  • Page 17: How To Obtain Repair Services

    HOW TO OBTAIN REPAIR SERVICES You may have to return your instrument to the ILX Lightwave facility at some time for repair or service whether it is under warranty or not. There is a charge for repairs after the warranty period has expired. Contact an ILX Lightwave service representative for shipping instructions prior to returning the instrument.

  • Page 18: Ldx-3200 Series Specifications

    Maximum output current transient resulting from a 1000 V power-line transient spike. Tested to ILX Lightwave Technical Standard #LDX-00196. Request ILX Application Note Maximum monitor photodiode current drift over any 30 minute period. Assumes zero drift in responsivity of photodiode.

  • Page 19: Available Options And Accessories

    LDM-4442 Current Source Interconnect Cable (unterminated) CC-306S Current Source Interconnect Cable (terminated) CC-305S Other Laser Diode Mounts are available. Please contact ILX Lightwave for information on additional options for your applications. INTRODUCTION TO THE LDX-3200 SERIES CHPT 1 PAGE Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 20 CHAPTER 2 HOW TO OPERATE YOUR LDX-3200 INTRODUCTION APPLYING POWER TO YOUR LDX-3200 The Power-On Sequence The Power-On State CONNECTING TO THE LASER Interlock Connections Photodiode Connections Setting the PD bias Grounding considerations FRONT PANEL OPERATION The Display OPERATING A LASER IN CONSTANT CURRENT, “I” MODE Setting Up the Precision Current Source Conditions Which Will Automatically Shut Off the LASER OUTPUT OPERATING A LASER IN CONSTANT POWER MODE, P...
  • Page 21 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 22: Chapter 2 How To Operate Your Ldx-3200

    HOW TO OPERATE YOUR LDX-3200 INTRODUCTION This chapter introduces you to the operation of the LDX-3200 Series Precision Current Source. It offers instructions for connecting your laser to the current source, and describes powering up the instrument. This chapter also contains step by step procedures that teach you how to operate your current source in Constant Current Mode and Constant Power Mode.

  • Page 23: Connecting To The Laser

    It is also recommended that the connections to the LDX-3200 Series Precision Current Source output be made using twisted wire pairs with an earth-grounded shield (see Figures 2.1 A - D). The output terminals of the instrument are left floating relative to earth ground to suppress AC power-on/power-off transients that may occur through an earth- ground path.
  • Page 24 LDX-3200 Series Precision Current Source OUTPUT Bias P. D. L. D. Earth Ground Figure 2.1A Common Laser Cathode - Photodiode Cathode LDX-3200 Series Precision Current Source OUTPUT Bias P. D. L. D. Earth Ground Figure 2.1B Common Laser Cathode - Photodiode Anode...

  • Page 25: Interlock Connections

    Setting the PD bias The LDX-3200 Series Precision Current Source provides an adjustable reverse bias of 0 - 5 VDC for the photodiode. To set the photodiode bias to 5 volts reverse bias, turn the back panel PHOTODIODE BIAS ADJUST fully clockwise.

  • Page 26: Front Panel Operation

    FRONT PANEL OPERATION This section describes fundamentals of operation for your LDX-3200 Series Precision Current Source in two operating modes, Constant Current (I), and Constant Power (P). The Display The digital display is used to show control parameters such as laser drive current (mA), laser current limit (mA), laser forward voltage (V), voltage limit (V), monitor photodiode current (µA), and laser optical...

  • Page 27: Conditions Which Will Automatically Shut Off The Laser Output

    At this point the LDX-3200 Series current source is in Constant Current Mode, (I), in the 200 mA range, and the display is reading in mA. Next, we need to adjust the set point of the laser current source. To adjust the set point of the current source to 150 mA, turn the adjust knob to vary the set point. When the adjust knob is turned, the LDX-3200 automatically changes to set point mode indicated by the flashing annunciator.

  • Page 28: Operating A Laser In Constant Power Mode, P

    OPERATING A LASER IN CONSTANT POWER MODE, P Suppose you want to operate a 3 mW laser at constant 1 mW level. The LDX-3200 Series instrument allows you to operate the laser current source driver in a Constant Power mode. In this mode, the LDX-3200 Series instrument drives current to the laser to reach a set point power value (in mW).

  • Page 29: Error Indicators

    Constant Power set point and maintain closed loop control with the PD current measurement. ERROR INDICATORS The LDX-3200 Series Precision Current Sources indicate general operational error conditions. Each error condition results in an action as shown in the following table.
  • Page 30 OPERATING IN REMOTE CONTROL INTRODUCTION Reading the GPIB Address Changing the GPIB Address Changing Operation from Local to Remote LDX-3200 SERIES CURRENT SOURCE COMMAND SET Command Syntax Command Paths IEEE488.2 Common Commands LDX-3200 Current Source Often Used Commands STATUS REPORTING...
  • Page 31 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 32: Chapter 3 Operating In Remote Control

    LOCAL switch returns the instrument to LOCAL control mode unless the Local Lockout state has been activated by the host computer. Local Lockout disables all LDX-3200 Series Precision Current Source front panel switches until this condition is changed by the host computer. When the instrument is put in Local Lockout Mode by the host computer, the REMOTE indicator will flash at a 1 Hz rate to indicate that the front panel is completely disabled by Local Lockout.

  • Page 33: Ldx-3200 Series Current Source Command Set

    Colons (:) indicate the start of a new command path, while semicolons (;) indicate a separation of commands within a command string. A leading colon on a command may be used to return the LDX-3200 Series Precision Current Source command parser to the command path root (see Figure 3.1).
  • Page 34 (see “TERM” command, Chapter 4). For more information, refer to your GPIB driver configuration manual. The command structure is illustrated in Figure 3.1. Table 4.1 lists all of the LDX-3200 Series Precision Current Source's device-dependent commands, with the full path shown for each command and a brief explanation of its usage.

  • Page 35: Command Paths

    Command Paths The LDX-3200 Series Precision Current Source device-dependent commands are structured into a tree format (see Figure 3.1). Each of the legal paths is listed below, followed by its list of path options, each of which is followed by the commands themselves.

  • Page 36: Ieee488.2 Common Commands

    SAVE function), *ESE (0 to 255, see Figure 3.2), *SRE (0 to 255, see Figure 3.2), and *PUD (used at factory only). A list of all of the IEEE 488.2 Common Commands supported by the LDX-3200 Series follows. *CAL?
  • Page 37 LDX-3200 Series' Often Used Commands The LDX-3200 Series Precision Current Source's complete command set contains over 60 commands that allow you to operate the Current Source for a variety of applications. Within the command set, however, is a smaller subset of commands that will meet most of your needs.

  • Page 38: Status Reporting

    1 and *SRE 5), and have an SRQ handling routine in the user's software which reads a new measurement after the output on state has been reached. This allows the use of the operation complete features of the LDX-3200 Series Precision Current Source, without the need for program looping or polling which can tie up the GPIB.
  • Page 39 15 – N/A ERROR QUEUE Figure 3.2 LDX-3200 Series Status Reporting Schematic Diagram NOTE If the GPIB times out while waiting for a response, either set the GPIB time-out longer or use SRQ generated interrupts in your program. See your GPIB manual for time-out configuration or SRQ programming setup.

  • Page 40: Output Off Register

    Output Off Register The Output Off Enable Register allows you to determine which conditions and events in the LDX-3200 Series Precision Current Source can cause the current source output to be turned off. This register is configured in a manner which is similar to the status reporting registers.

  • Page 41: Command Timing And Completion

    14- N/A 7- N/A 15- N/A Figure 3.3 LDX-3200 Series' Output Off Register Command Timing and Completion 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 this command is being executed, or if the next command must wait until this command is completed before its execution begins.

  • Page 42: Error Messages

    All LDX-3200 Series’ 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. The *WAI (common command) is an example of a sequential command which forces the next command to wait until the no-operation-pending flag is true.

  • Page 43: Operating In Remote Control Chpt

    E-519 Setting a measurement is only valid during the calibration phase for that measurement. User has tried to calibrate a measurement without first entering the required calibration mode. Table 3.5 LDX-3200 Series Error Codes OPERATING IN REMOTE CONTROL CHPT 3 PAGE 12 Artisan Technology Group - Quality Instrumentation ...
  • Page 44 CHAPTER 4 COMMAND REFERENCE INTRODUCTION LDX-3200 SERIES DEVICE-DEPENDENT COMMANDS LDX-3200 SERIES DEVICE-DEPENDENT COMMAND REFERENCE COMMAND REFERENCE CHPT 4 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 45 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 46: Introduction

    COMMAND REFERENCE INTRODUCTION This chapter is a guide to all of the device-dependent commands for the LDX-3200 Series Precision Current Source. This chapter is divided into two parts. The first part contains an overview of the remote commands used by the LDX-3200 Series Precision Current Source.
  • Page 47 Returns the laser constant I (current) set point. LAS:SET:MDI? NONE Returns the laser constant optical power set point. Table 4.1 LDX-3200 Series Device-Dependent Commands (Cont.) COMMAND REFERENCE CHPT 4 PAGE 2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 48 Returns the elapsed time since the instrument was last powered up. TIMER? NONE Returns the elapsed time since the timer was last reset. Table 4.1 LDX-3200 Series Device-Dependent Commands (Cont.) COMMAND REFERENCE CHPT 4 PAGE 3 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 49: Ldx-3200 Series Device-Dependent Commands

    LDX-3200 SERIES DEVICE-DEPENDENT COMMANDS This section contains all of the device-dependent commands for the LDX-3200 Series Precision Current Source, listed in alphabetical order. Sub-sections for each path are presented, listing the commands which are legal for that path. See Figure 3.1 for command path tree structure.

  • Page 50: Ldx-3200 Series Device-Dependent Command Reference

    LDX-3200 SERIES DEVICE-DEPENDENT COMMAND REFERENCE The following pages contain a reference for the device-dependent commands of the LDX-3200 Series Precision Current Source. This reference contains useful information for both local and remote operation of the LDX-3200 Series Precision Current Source.
  • Page 51 "LAS:LDI 22;Delay 2000;LAS:LDI?" -actions: The current is set to 22.0 mA, then the LDX-3200 Series Precision Current Source waits for about 2.0 seconds before returning the measured current. NOTE Care should be taken to set the GPIB time-out appropriately for use with the Delay command.
  • Page 52 An <nrf value>, in microamps/milliwatt. The range is 0 to 1000. POINTS OF INTEREST If the parameter is set to 0, the LDX-3200 Series Precision Current Source will operate in a constant I mode, when Constant P (MDP) mode is selected.
  • Page 53 CALPD POINTS OF INTEREST If this value is 0, the LDX-3200 Series Precision Current Source will be set to operate in constant mode, and the I set point value will be in effect. If this value is non-zero, the LDX-3200...
  • Page 54 LASer:CAL:LDI? n Front Panel n Remote The LASer:CAL:LDI? query is used to determine that the LDX-3200 Series Precision Current Source is ready for a value to be entered during the calibration cycle of the LASer:CAL:LDI mode. SYNTAX DIAGRAM COMMAND REFERENCE...
  • Page 55 POINTS OF INTEREST After this query is issued and a response of 1 is received, the LDX-3200 Series Precision Current Source will be ready for the user to enter a current value via the LASer:LDI command (see Chapter 6). EXAMPLES "LASer:CAL:LDI?"...
  • Page 56 LASer:CAL:LDV? n Front Panel n Remote The LASer:CAL:LDV? query is used to determine that the LDX-3200 Series Precision Current Source is ready for a value to be entered during the calibration cycle of the LASer:CAL:LDV mode. SYNTAX DIAGRAM POINTS OF...
  • Page 57 LASer:CAL:MDI? n Front Panel n Remote The LASer:CAL:MDI? query is used to determine that the LDX-3200 Series Precision Current Source is ready for a value to be entered during the calibration cycle of the LASer:CAL:MDI mode. SYNTAX DIAGRAM POINTS OF...
  • Page 58 LASer:COND? ¨ Front Panel n Remote The LASer:COND? query returns the value of the status condition register of the LASER operations. SYNTAX DIAGRAM COND -where the response is the sum of the following: 1 - LASER Current Limit 256 - Output is shorted 2 - LASER Voltage Limit 512 - Output is outside tolerance limit 4 - N/A...
  • Page 59 LASer:DEC ¨ Front Panel n Remote The LASer:DEC command decrements the selected laser control mode set point by one or more steps. Optional parameters allow multiple steps to be decremented and the time (in milliseconds) between decrements to be set, respectively. This is an overlapped command. Other commands may be executed while this function is in progress.
  • Page 60 LASer:DISplay ¨ Front Panel n Remote The LASer:DISplay command enables or disables (turns off) the display and some LEDs. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value> -where 1 = on, 0 = off. POINTS OF INTEREST Turning the dis play and LEDs off means that a message of all blank spaces is sent to the display, and most of the LEDs will be turned off.
  • Page 61 LASer:DISplay:LDI n Front Panel n Remote The LASer:DISplay:LDI command sets the display to show the LDI (laser diode current) measurement. SYNTAX DIAGRAM PARAMETERS None. POINTS OF INTEREST The LDI measurement display mode is turned off automatically when another display selection is enabled.
  • Page 62 EXAMPLES "LAS:DIS:LDI?" -response: 0, means that the LDI measurement is not displayed. "Las:dis:ldI?" -response: 1, means that the LDI measurement is displayed. LASer:DISplay:LDV n Front Panel n Remote The LASer:DISplay:LDV command sets the display to show the laser forward voltage measurement. SYNTAX DIAGRAM PARAMETERS None.
  • Page 63 EXAMPLES "LAS:DIS:LDV?" -response: 0, means that the laser voltage measurement is not displayed. "LAS: DIS:LDV?" -response: 1, means that the laser voltage measurement is displayed. LASer:DISplay:MDI n Front Panel n Remote The LASer:DISplay:MDI command sets the display to show the monitor photodiode current measurement. SYNTAX DIAGRAM PARAMETERS None.
  • Page 64 POINTS OF INTEREST In local operation, the status of the MDI measurement mode is indicated by the enunciator next to the display (µA will be illuminated and not blinking when the display is in MDI measurement mode). EXAMPLES "LAS:DIS:MDI?" -response: 0, means that the laser photodiode monitor current measurement is not displayed.
  • Page 65 LASer:DISplay:MDP? o Front Panel n Remote The LASer:DISplay:MPD? query returns the status of the MDP (monitor diode power) measurement display mode. SYNTAX DIAGRAM -where the response is 0 or 1. POINTS OF INTEREST In local operation, the status of the MDP measurement mode is indicated by the enunciator next to the display (mW will be illuminated and not blinking when the display is in MDP measurement mode).
  • Page 66 EXAMPLES "Laser:Display:Param" -action: selects a parameter and displays its value. "LAS:DIS:PARAM" -action: selects a parameter and displays its value. LASer:DISplay:SET n Front Panel n Remote The LASer:DISplay:SET command sets the display to show the set point of the selected display mode. SYNTAX DIAGRAM PARAMETERS None.
  • Page 67 LASer:ENABle:COND ¨ Front Panel n Remote The LASer:ENABle:COND command sets the condition status enable register of the LASER operations for summary (in bit 3 of the status byte) and generation of service requests. SYNTAX DIAGRAM <white <nrf ENAB COND value> space>...
  • Page 68 LASer:ENABle:COND? ¨ Front Panel n Remote The LASer:ENABle:COND? query returns the value of the status condition enable register of the LASER operations. SYNTAX DIAGRAM ENAB COND -where the response is the sum of the following: 1 - LASER Current Limit 256 - Output is Shorted 2 - LASER Voltage Limit 512 - Output Changed to be In/Out of Tolerance...
  • Page 69 LASer:ENABle:EVEnt ¨ Front Panel n Remote The LASer:ENABle:EVEnt command sets the status event enable register of the LASER operations. These events are summarized in bit 2 of the status byte register. SYNTAX DIAGRAM <white <nrf ENAB value> space> PARAMETERS An <nrf value> whose sum represents the bits which are enabled: 1 - LASER Current Limit 256 - Output is Shorted 2 - LASER Voltage Limit...
  • Page 70 LASer:ENABle:EVEnt? ¨ Front Panel n Remote The LASer:ENABle:EVEnt? query returns the value of the status event enable register of the LASER operations. SYNTAX DIAGRAM ENAB -where the response is the sum of the following: 1 - LASER Current Limit 256 - Output is Shorted 2 - LASER Voltage Limit 512 - Output Changed to be In/Out of Tolerance 4 - N/A...
  • Page 71 PARAMETERS An <nrf value> whose sum represents the enabled bits: 1 - LASER Current Limit 256 - N/A 2 - LASER Voltage Limit 512 - Output is Out of Tolerance 4 - N/A 1024 – N/A 8 - Power Limit (With Output On) 2048 –...
  • Page 72 -where the response is the sum of the following: 1 - LASER Current Limit 256 - N/A 2 - LASER Voltage Limit 512 - Output is Out of Tolerance 4 - N/A 1024 - N/A 8 - Power Limit (With Output On) 2048 - N/A 16 - N/A 4096 - N/A...
  • Page 73 POINTS OF INTEREST The LASER conditions that are reported in the status byte can be set by using the LASer:ENABle:EVEnt command. The LASER event status is only cleared when the event status is read or by the *CLS command, while the condition status is constantly changing. EXAMPLES "LAS:EVE?"...
  • Page 74 If the first optional parameter is entered as zero, "LAS:INC 0", the command will do nothing. The minimum time to complete one increment is about 20 msec. Therefore, values for the second optional parameter (time between increments) have a practical minimum of 20. This command should not be overlapped with "LAS:DEC"...
  • Page 75 LASer:LDI? n Front Panel n Remote The LASer:LDI? query returns the value of the measured laser current. SYNTAX DIAGRAM -where the response is the most recent laser current measurement. POINTS OF INTEREST Response is the measured laser output current, for either low or high bandwidth modes. This measurement is updated approximately once every 600 msec.
  • Page 76 LASer:LDV? ¨ Front Panel n Remote The LASer:LDV? query returns the value of the measured laser voltage. SYNTAX DIAGRAM -where the response is the measured laser output voltage, for either low or high bandwidth modes. POINTS OF INTEREST This measurement is updated approximately once every 600 msec. EXAMPLES "LAS:ldv?"...
  • Page 77 LASer:LIMit:I1? n Front Panel n Remote The LASer:LIMit:I1? query returns the value of the LASER current limit for the 100 mA range on the LDX-3210. (Not applicable for LDX-3220). SYNTAX DIAGRAM -where the response is the current limit for the 100 mA range (LDX-3210). POINTS OF INTEREST The current limit is in effect in all modes of operation (ILBW, IHBW, or P).
  • Page 78 LASer:LIMit:I2? n Front Panel n Remote The LASer:LIMit:I2? query returns the value of the LASER current limit for the 200 mA range on the LDX- 3220. (Not applicable for LDX-3210). SYNTAX DIAGRAM -where the response is the current limit value for the 200 mA range (LDX-3220). POINTS OF INTEREST The current limit is in effect in all modes of operation (ILBW, IHBW, or P).
  • Page 79 LASer:LIMit:I5? n Front Panel n Remote The LASer:LIMit:I5? query returns the value of the LASER current limit for the 50 mA range on the LDX-3210 or the 500 mA range on the LDX-3220. SYNTAX DIAGRAM -where the response is the current limit value for the 50 mA range (LDX-3210) or 500 mA range (LDX-3220).
  • Page 80 XAMPLES "LAS:LIM:MDP 10" -action: sets the laser output power limit to a value which corresponds to producing 10.00 mW of PD feedback (optical) power. "Las:Limit:MDp 5" -action: sets the laser output power limit to a value which corresponds to producing 5.00 mW of PD feedback (optical) power. LASer:LIMit:MDP? n Front Panel n Remote...
  • Page 81 POINTS OF INTEREST The voltage limit setting is useful for 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.
  • Page 82 LASer:MDI n Front Panel n Remote The LASer:MDI command sets the value of the optical power set point, in µA, if the CALMD (CAL PD) responsivity is 0. SYNTAX DIAGRAM <white <nrf space> value> An <nrf value> which represents the photodiode feedback current, in µA. PARAMETERS POINTS OF INTEREST...
  • Page 83 POINTS OF The response is in µA. The response is valid, even when the unit is not in constant P mode. INTEREST This measurement is updated approximately once every 600 msec. "Las:Mode:MDP; Las:Calmd 0; Las:MDi?" -response: 100.0, means 100 µA of photodetector EXAMPLES current.
  • Page 84 POINTS OF INTEREST The LASER modulation control switches the front panel BNC in and out of the LAS control circuit. At power-up or after reset, modulation is enabled by default. EXAMPLES "LAS:MDLN?" -response: 1, means that the LAS modulation input is enabled. "las:mdln?"...
  • Page 85 LASer:MDP? n Front Panel n Remote The LASer:MDP? query returns the value of the laser photodetector power measurement, in mW. SYNTAX DIAGRAM -where the response is the most recent LASER power measurement. POINTS OF INTEREST The response is in mW. The response is valid, even when the unit is not in constant P mode. This measurement is updated approximately once every 600 ms ec.
  • Page 86 EXAMPLES "LAS:MODE?" -response: ILBW, means that constant I (current) mode is in effect for the laser output. ":Las:Mode?" -response: MDP, means that constant P (power) mode is in effect for the laser output, and CALMD > 0. "Las:Mode?" -response: MDI, means that constant P (power) mode is in effect for the laser output, and CALMD = 0.
  • Page 87 POINTS OF INTEREST Constant I mode (low bandwidth) enables the output low bandpass filter. EXAMPLES "LAS:MODE:ILBW" -action: sets the laser output for constant I mode (low bandwidth). LASer:MODE:MDP n Front Panel n Remote The LASer:MODE:MDP command selects laser constant power mode. SYNTAX DIAGRAM MODE PARAMETERS...
  • Page 88 POINTS OF INTEREST There is a 2-second delay after the output is turned on before the output shorting relay is opened. Following this, the output current ramps up to the current set point slowly to protect the laser. Therefore, the time to turn the output on and reach the set point current varies from 2 to about 3 seconds.
  • Page 89 The Laser Drive Current output should be "off" when this command is issued. If the Laser Diode Current output is "on" when this command is issued, the LDX-3200 Series Precision Current Source will generate error E515, and the range will not be changed.
  • Page 90 EXAMPLES "LAS:RAN?" -response: 1, means that the Laser Drive Current range is 100 mA (LDX-3210 only). "LAS:range?" -response: 2, means that the Laser Drive Current range is 200 mA (LDX-3220 only). LASer:SET:LDI? n Front Panel n Remote The LASer:SET:LDI? query returns the constant I value which is used for both output ranges and both bandwidths.
  • Page 91 LASer:SET:MDI? n Front Panel n Remote The LASer:SET:MDI? query returns the laser monitor PD current set point value (when CALPD = 0), in µA. SYNTAX DIAGRAM set point value, in µA. -where the response is the constant I POINTS OF INTEREST In local operation, the MDI set point is read by selecting P mode, then pressing and holding down the SELECT switch in the DISPLAY area of the front panel.
  • Page 92 LASer:SET:MDP? n Front Panel n Remote The LASer:SET:MDP? query returns the laser monitor PD power set point value (when CALMD [CAL PD] is not zero), in mW. SYNTAX DIAGRAM -where the response is the constant P set point, in mW. POINTS OF INTEREST In local operation, the MDP set point is read by selecting P mode, then pressing and holding...
  • Page 93 POINTS OF INTEREST The step of 1 corresponds to the smallest display resolution for the mode. For example, a step of 1 means 0.01 mA (LDX-3220) or 0.002 mA (LDX-3210, 100 mA range) or 0.001 mA (LDX-3210, 50 mA range), 0.01 mW, or 1 µA (if CALPD = 0). EXAMPLES "Las:Mode:i;...
  • Page 94 POINTS OF INTEREST The LDX-3200 Series Precision Current Source defaults to a tolerance of 10.0 mA for 5 seconds, unless changed by the LASer:TOLerance command. If the LDX-3200 Series Precision Current Source is operated in P mode, the current tolerance parameter is not used.
  • Page 95 EXAMPLES "Las:Tol?" -response: "0.2,5.0", means the LDX-3200 Series Precision Current Source has a LASER current tolerance setting of 0.2 mA with a time window of 5.000 seconds. "LASER:TOL?" -response: "1.0,20.0", means the LDX-3200 Series Precision Current Source has a LASER current tolerance setting of 1.0 mA with a time window of 20.000 seconds.
  • Page 96 POINTS OF INTEREST 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". "Message?"...
  • Page 97 OCT means octal. POINTS OF INTEREST DEC is the default type. The LDX-3200 Series Precision Current Source defaults to this radix at power-up. The RADix command is used to select the desired radix. Once it is changed, the new radix will remain in effect until the power is shut off or a new RADix command is issued.
  • Page 98 POINTS OF INTEREST An altered terminator will be in the form <CR><NL><^END>. This termination will be sent with all output until the “TERM 0” command is sent or the LDX-3200 Series Precision Current Source is powered off. COMMAND REFERENCE CHPT 4 PAGE 53 Artisan Technology Group - Quality Instrumentation ...
  • Page 99 TIME? ¨ Front Panel n Remote The TIME? query allows the programmer to determine how much time has passed since the LDX-3200 Series Precision Current Source was last powered up. SYNTAX DIAGRAM TIME -where the response is character data in the form: hours:minutes:seconds.
  • Page 100 TIMER? is issued its response will be the same as if a TIME? query's response. EXAMPLES "Timer?" -response: 00:02:00.31, means the LDX-3200 Series Precision Current Source has been on for 2 minutes and 0.31 seconds since the last TIMER? query was issued.
  • Page 101 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 102 CHAPTER 5 FUNCTIONS AND FEATURES Introduction Saving and Recalling from the Front Panel Saving and Recalling under remote operation Using the LASER COMPLIANCE VOLTAGE ADJUSTMENT Using the LDX-3200 Current Source’s Trigger Function Modulating the Laser Current Source FUNCTIONS AND FEATURES CHPT 5 Artisan Technology Group - Quality Instrumentation ...
  • Page 103 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 104: Chapter 5 Functions And Features

    FUNCTIONS AND FEATURES INTRODUCTION This chapter introduces you to the LDX-3200 Series Precision Current Source functions and operating features such as event triggering, analog modulation of laser injection current, and Save and Recall. SAVING AND RECALLING FROM THE FRONT PANEL For applications where you might need to alternate between particular instrument configurations, the LDX-3200 Current Sources offer a unique SAVE and RECALL feature.

  • Page 105: Using The Laser Compliance Voltage Adjustment

    USING THE LASER COMPLIANCE VOLTAGE ADJUSTMENT For applications where you need to have critical protection of the laser we recommend the following. Using a one ohm resistor or other non-critical load, set the LASER voltage limit as described in Chapter 2. Then with the LASER output on, slowly increase the LASER current and watch the LASER voltage measurement.

  • Page 106: Modulating The Laser Current Source

    200 mA range, high bandwidth mode with a limit of 175 mA. The allowable bandwidth of the modulated analog signal, defined as the 3 dB roll off point, is dependent on the LDX-3200 Series family member, the output current range, and the mode (constant current low/high bandwidth).
  • Page 107 Next, set the current source range by selecting the 200 mA range indicated by the accompanying LED. You will need to press the select push button twice to change the range. It must be pressed twice quickly (within less than 1 second) to switch between modes, and the current source output must be off (MODE ON indicator unlit) in order to change ranges.
  • Page 108 CHAPTER 6 CALIBRATION AND TROUBLESHOOTING GUIDE INTRODUCTION Calibration Overview Recommended Equipment LOCAL CALIBRATION OF THE LDX-3200 SERIES CURRENT SOURCE Current Source Calibration I PD Current Calibration Laser Forward Voltage Measurement Calibration REMOTE CALIBRATION OF THE LDX-3200 SERIES CURRENT SOURCE Current Source Calibration...
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  • Page 110: Chapter 6 Calibration And Troubleshooting Guide

    Your LDX-3200 Series Current Source can be calibrated with the case closed. It should be calibrated every 12 months or whenever performance verification indicates that calibration is necessary, such as differences between set point and measurement display values which exceed the accuracy specification.

  • Page 111: Local Calibration Of The Ldx-3200 Series Current Source

    LOCAL CALIBRATION OF THE LDX-3200 SERIES CURRENT SOURCE There are three calibration adjustments required for the LASER current source of the LDX-3200 Series Current Source. They are calibration of the constant current source for both bandwidths and ranges, calibration of the laser voltage measurement, and calibration of the constant light power (I ) feedback circuits.

  • Page 112: Current Source Calibration

    Release the (PARAMETER) SET switch. After the (PARAMETER) SET switch is released, the Current Source will drive the current output to about 25% of the first calibration set point. g. Calculate the measured current again through the load resistor. CALIBRATING THE LDX-3200 SERIES CURRENT SOURCE CHPT 6 PAGE 3...

  • Page 113: I Pd Current Calibration

    P modes. When these values are reached and are stable, the user enters the actual value of the monitor current, measured with a DMM. The LDX-3200 Series Current Source then automatically calibrates the LASER feedback circuits. Configure the Current Source in the following manner for the Laser Current Source calibration:...

  • Page 114: Laser Forward Voltage Measurement Calibration

    Release the (PARAMETER) SET switch to accept the second calibration point. After the (PARAMETER) SET switch is released, the LDX-3200 Series Current Source will calculate the calibration constants and store them to nonvolatile memory.

  • Page 115: Remote Calibration Of The Ldx-3200 Series Current Source

    Once the second actual voltage value is entered, the Current Source will store the new calibration constants. This ends the section on front panel calibration of your LDX-3200 Series Current Source. The next section discusses calibration through the IEEE488.2 GPIB interface.
  • Page 116 If this value is to be measured and entered remotely via a GPIB controlled DMM, for example, the measured value of the current should not be entered until the LDX-3200 Series Current Source is ready to receive it: The Current Source will be ready to receive the new measured value when, after a "LAS:CAL:LDI?" query is sent, the response from the Current Source is "1".

  • Page 117: I Pd Current Calibration

    P modes. When these values are reached and are stable, the user enters the actual value of the current, as measured by an external DMM. The LDX-3200 Series Current Source then automatically calibrates the LASER feedback circuits. Configure the Current Source in the following manner for the Laser Current Source calibration:...

  • Page 118: Laser Forward Voltage Measurement Calibration

    Enter the measured voltage (in volts) via the "LAS:LDV <nrf value>" command. The measured value of the voltage should not be entered until the LDX-3200 Series Current Source is ready to receive it. The current source will be ready to receive the voltage value when, after a "LAS:CAL:LDV?" query is sent, the response from the Current Source is "1".

  • Page 119: Troubleshooting Guide

    TROUBLESHOOTING GUIDE This section is a guide to troubleshooting the LDX-3200 Series Current Sources. Some of the more common symptoms are listed here, and the appropriate troubleshooting actions are given. We recommend that the user start at the beginning of this guide. Read the symptom descriptions, and follow the steps for the corrective actions which apply.
  • Page 120 A high impedance may cause this condition. Open circuit error E503 or Voltage Limit error E505 The LDX-3200 Series instruments have an adjustable laser prevents output from reaching desired value. compliance voltage. Check to see if the LASER voltage limit setting is too low (see Chapter 2).
  • Page 121 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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