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ILX Lightwave LDC-3916371 User Manual

High tec resolution laser diode controller module
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  • Page 1 (217) 352-9330 | Click HERE Find the Newport / ILX Lightwave LDC-3916376 at our website:...
  • Page 2 User’s Guide High TEC Resolution Laser Diode Controller Module -3916371 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 70028603_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. All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation.
  • 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

    Safety Symbols and Terms ..............................1 Product Overview ................................2 Initial Inspection................................2 Installing your LDC-3916371 Laser Diode Controller Module ..................2 LDC-3916371 Controller Module Specifications......................4 Chapter 2 How to Operate Your LDC-3916371 Controller Module Introduction ................................1 Connecting to the Laser Controller..........................2 Connecting to the TEC Controller...........................5 Operating the Laser Current Source from the Front Panel ....................6...
  • Page 9 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 10 INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE INTRODUCTION SAFETY SYMBOLS AND TERMS PRODUCT OVERVIEW INITIAL INSPECTION INSTALLING YOUR LDC-3916371 LASER DIODE CONTROLLER MODULE Installation into LDC-3916 Laser Diode Controller Mainframe General Shipping Instructions LDC-3916371 LASER DIODE CONTROLLER MODULE SPECIFICATIONS Laser Current Source Specifications...
  • Page 11 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 12: Chapter 1 Introduction To The Ldc-3916371 Controller Module

    INTRODUCTION TO THE LDC-3916371 CONTROLLER MODULE INTRODUCTION This chapter is an introduction to the LDC-3916371 Laser Diode Controller Module for the LDC-3916 LD Controller Mainframe containing unpacking information, instructions on how to install and apply power, and safety considerations and instructions. It also contains some maintenance information, and specifications.

  • Page 13: Product Overview

    INITIAL INSPECTION When you receive your LDC-3916371 Controller Module, inspect it for any shipping damage. A shipping kit should be included which contains 9-pin and 15-pin D-sub connectors with hoods plus this Instruction Manual. INSTALLING YOUR LDC-3916371 LASER DIODE CONTROLLER MODULE...

  • Page 14: General Shipping Instructions

    General Shipping Instructions If you need to ship your LDC-3916371 Laser Diode Controller Module back to the factory for repair, be sure that the module is packaged in an anti-static bag and an enclosure with cushioning material to prevent damage to the module during shipment (use the original shipping containers and accessories if possible).

  • Page 15: Ldc-3916371 Laser Diode Controller Module Specifications

    LDC-3916371 LASER DIODE CONTROLLER MODULE SPECIFICATIONS Laser Current Source Specifications MODEL NUMBER: 3916371 DRIVE CURRENT OUTPUT Output Current Range: 0 to 500 mA 10 µA Set-Point Resolution: ± 0.1% of full scale Set-Point Accuracy: Compliance Voltage: 6 V (adjustable voltage limit) ≤...

  • Page 16: Temperature Control (Tec) Specifications

    Software limits of display range. Voltage measurement accuracy while driving calibration load. Accuracy is dependent upon load used. In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right to change specifications without notice or liability for such changes.
  • Page 17 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 18 CHAPTER 2 HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE INTRODUCTION CONNECTING TO THE LASER CONTROLLER Interlock Connections Photodiode Connections Grounding Considerations CONNECTING TO THE TEC CONTROLLER TEC Grounding Considerations OPERATING THE LASER CURRENT SOURCE FROM THE FRONT PANEL OPERATING A LASER IN CONSTANT CURRENT (I) MODE...
  • Page 19 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 20: Chapter 2 How To Operate Your Ldc-3916371 Controller Module

    HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE INTRODUCTION This chapter introduces you to the operation of the LDC-3916371 LD Controllers’ laser drive and TEC control functions. It offers instructions for connecting your laser to the current source and temperature controller. This chapter also contains step by step procedures that teach you how to operate your controller module in Constant Current Mode and Constant Power Mode, and to operate the temperature controller in Constant Temperature Mode.

  • Page 21: Connecting To The Laser Controller

    LASER Output off. It is also recommended that the connections to the LDC-3916371 Laser Diode Controller module output be made using twisted wire pairs with an earth-grounded shield (see Figures 2.1 A - D). We recommend using our CC-305S (or shorter CC-315S) Shielded Laser Cable which is a unique twisted-pair cable with braided outer shield designed to provide the best possible rejection of most transient noise signals.
  • Page 22 There are connections provided for laser cathode and anode, photodiode cathode and anode, chassis ground, interlock, and laser forward voltage. The pinout diagram for this connector is shown in Figure 2.2. HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 3 Artisan Technology Group - Quality Instrumentation ...

  • Page 23: Interlock Connections

    2.1, but the common connection (between the photodiode and the laser) is optional. Grounding Considerations The LASER outputs of the LDC-3916371 Laser Diode Controller Module are isolated from chassis ground allowing either output terminal to be grounded at the user's option. Figure 2.1 shows the proper earth-ground shielding for laser diode/photodiode connections.

  • Page 24: Connecting To The Tec Controller

    Analog Ground is provided at pin 9 as a convenient reference when making measurements or troubleshooting a system, but is not normally connected. Pins 10 through 15 are reserved by ILX Lightwave for diagnostic purposes and must not be connected to anything.

  • Page 25: Operating The Laser Current Source From The Front Panel

    OPERATING A LASER IN CONSTANT CURRENT (I) MODE Suppose you have an LDC-3916371 Controller 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. The Ilbw mode uses a low-pass filter on the laser drive current output to significantly reduce noise.

  • Page 26: Selecting The Mode Of Control

    Constant Current low bandwidth (Ilbw), Constant Optical Power (P), Constant Current high bandwidth (Ihbw), and Photodiode Current (Ipd) control modes. Set the LDC-3916371 Controller Modules in Constant Current low bandwidth mode by selecting the Ilbw mode.

  • Page 27: Setting The Voltage Limit

    The Bias parameter setting controls whether a 5 volt reverse voltage is supplied to the monitor photodiode or not. Set the Bias parameter to ON or OFF as desired. HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 8...

  • Page 28: 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-3916371 Controller Modules allow you to operate the instrument current source drivers in Constant Optical Power (P) mode. In the “P” mode, the controller drives current to the laser to reach a set power value in mW.

  • Page 29: Selecting The Mode Of Control

    Constant Current low bandwidth (Ilbw), Constant Optical Power (P), Constant Current high bandwidth (Ihbw), and Photodiode Current (Ipd) control modes. Set the LDC-3916371 Controller Module in Constant Optical Power mode by selecting the P mode. Setting the Current Limit...

  • Page 30: Setting The Power Limit

    • Calculate the responsivity (CalPD) by dividing the photodiode current by the optical power noting the units required are µA/mW. HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 11 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 31: Setting The Photodiode Bias Voltage

    Select the Modulation parameter by pressing the (DISPLAY) UP/DOWN ARROW keys until the Modulation parameter is highlighted. Adjust the value to ON or OFF as desired. Refer to the LDC-3916371 module specifications in chapter 1 for modulation input specifications and limitations.

  • Page 32: Conditions Which Will Automatically Shut Off The Laser Output

    LASER output is active. The LDC-3916371 Controller Modules’ response to sensing the various limits can be controlled via the GPIB interface. Most high limit responses can be set to either turn off the source or just give a limit warning through the GPIB interface.
  • Page 33 Operating mode was changed while the laser current source was on. Table 2.3 LASER Error Indicators HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 14 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 34: Operating The Tec Controller From The Front Panel

    OPERATING THE TEC CONTROLLER FROM THE FRONT PANEL This section describes how to operate your LDC-3916371 Controller Module’s Temperature Controller in Constant Temperature Mode, T. There are three modes in which you can operate the temperature controller: Constant Temperature (T), Constant Thermistor Resistance (R), and Constant TEC Current (I).

  • Page 35: Selecting The Tec Control Mode

    Selecting the TEC Control Mode Set the LDC-3916371 Temperature Controller to Temperature Control mode by selecting T in the MODE section of the display on TEC p.1. Use the (DISPLAY) UP/DOWN arrow hard keys until the MODE parameter is highlighted.

  • Page 36: Setting Tec Current Limit

    The allowed GAIN values in the LDC-3916371 Temperature Controller are from 1 to 127 in steps of 1. These values define the proportional loop gain of our hybrid PI temperature control loop.

  • Page 37: Understanding Dac Mode

    The DAC values can be adjusted to any value between 10 and 65535 ( values less than 10 result in extremely high temperatures ). It is important to remember that as the DAC counts go down, the equivalent temperature goes HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 18 Artisan Technology Group - Quality Instrumentation ...

  • Page 38: Operating In Dac Mode

    The default condition for the TEC output is off when the instrument is first powered up. Other conditions which will disable the TEC output are listed in the next section. HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 19 Artisan Technology Group - Quality Instrumentation ...

  • Page 39: Conditions Which Will Automatically Shut Off The Tec Output

    TEC Module Open (while Output is enabled) • Sensor Shorted (while Output is enabled) • TEC mode changed (while output is enabled) HOW TO OPERATE YOUR LDC-3916371 CONTROLLER MODULE CHPT 2 PAGE 20 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 40: Tec Error Indicators

    TEC ERROR INDICATORS The LDC-3916371 Controllers indicate general TEC operational error conditions. When an error occurs, the Error Indicator Code will appear on the Status page, the Chan page, or the respective channel’s setup pages. The Error Indicator Code will clear when you exit any page where it appears. Error Indicator codes are summarized in Table 2.4.
  • Page 41 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 42 CHAPTER 3 OPERATING IN REMOTE CONTROL INTRODUCTION REMOTE CONFIGURATION LDC-3916371 LASER DIODE CONTROLLER COMMAND SET LDC-3916371 Laser Diode Controller Often Used Commands Command Timing and Completion STATUS REPORTING Status Registers Output Off Registers Error Messages OPERATING IN REMOTE CONTROL CHPT 3...
  • Page 43 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 44: Chapter 3 Operating In Remote Control

    TEC controller to turn off. The following sections show you the fundamentals of operating your LDC-3916371 module remotely through the GPIB and RS-232 interfaces.

  • Page 45: Ldc-3916371 Laser Diode Controller Often Used Commands

    :STAT? :VALUE? :TOL :TOL? Figure 3.1 LDC-3916 and LDC-3916371 Laser Diode Controller Command Path Structure LDC-3916371 Laser Diode Controller Often Used Commands OPERATING IN REMOTE CONTROL CHPT 3 PAGE 2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 46 The LDC-3916371 Laser Diode Controller’s complete command set contains over 100 commands that allow you to operate the controller for a variety of applications. Within the command set, however, is a smaller subset of commands that will meet most of your needs. These commands are listed in Table 3.1.

  • Page 47: Status Reporting

    Manual for details on remote status reporting. Each channel of the LDC-3916 may contribute to the “ALLCOND” and “ALLEVE” registers. For the LDC-3916371 modules, the enabled conditions of both the LAS and TEC are functions are logically ORed, and the summary is passed to the appropriate bit of the ALLCOND register (see Figure 3.2).
  • Page 48 LASER Condition Status Register LASer:COND? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LASER Condition Status Enable Register LASer:ENABle:COND <nrf>...
  • Page 49 LASER Event Status Register LASer:EVEnt? 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit-wise LOGICAL OR LOGICAL AND 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LASER Event Status Enable Register LASer:ENABle:EVEnt <nrf>...

  • Page 50: Output Off Registers

    TEC and LASER outputs to be turned off are shown in Figures 3.4 and 3.5. The default settings for these registers for an LDC-3916371 module are shown in Table 3.2. The registers take on these values at power up, as the result of a *RST command, or when you choose "Default"...
  • Page 51 13- N/A 6- N/A 14- N/A 7- N/A 15- N/A Figure 3.4 LDC-3916371 Laser Diode Controller LASER Output Off Register OPERATING IN REMOTE CONTROL CHPT 3 PAGE 8 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 52 14- N/A 7- TEC Module Open (output on) Cond. 15- N/A Figure 3.5 LDC-3916371 Laser Diode Controller TEC Output Off Register OPERATING IN REMOTE CONTROL CHPT 3 PAGE 9 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 53: Error Messages

    Error Messages This section contains descriptions of the errors which are specific to the LDC-3916371 modules. These are the error codes which are returned via the “MODERR?” query. Refer to LDC-3916 Laser Diode Controller Instruction Manual, Chapter 3, for a list of LDC-3916 mainframe error codes and descriptions (those are the codes returned via the “ERR?”...
  • Page 54 CHAPTER 4 COMMAND REFERENCE INTRODUCTION LDC-3916371 DEVICE-DEPENDENT COMMANDS LDC-3916371 DEVICE-COMMAND REFERENCE COMMAND REFERENCE CHPT 4 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 55 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 56: Introduction

    INTRODUCTION This chapter is a guide to all of the device-dependent commands for the LDC-3916371 Laser Diode Controller module. This chapter is divided into two parts. The first part contains an overview of the remote commands used by the LDC- 3916371.
  • Page 57 Used at factory to set calibration information. MODPUD? NONE Returns factory set calibration information. Table 4.1 LDC-3916371 Series Device-Dependent Commands (Cont.) COMMAND REFERENCE CHPT 4 PAGE 2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 58 LDC-3916371 Series Device-Dependent Commands NAME PARAMETERS FUNCTION STATMENU:LINEn? NONE Returns the name of the measurement that is displayed on line n of the status menu. (n can be either 1 or 2). STATMENU:LINEn:LDI NONE Sets line n of the status menu to display laser current...
  • Page 59 Table 4.1 LDC-3916371 Series Device-Dependent Commands (Cont.) NAME PARAMETERS FUNCTION TEC:LIM:ITE? NONE Returns the constant current source limit value. TEC:LIM:THI Sets the TEC upper temperature limit value. TEC:LIM:THI? NONE Returns the TEC upper temperature limit value. TEC:MODE? NONE Returns the mode, ITE (TEC current), R (sensor), T (temperature), or DAC (DAC count).

  • Page 60: Ldc-3916371 Device-Command Reference

    LDC-3916371 Device-Dependent Commands This section contains all of the device-dependent commands for the LDC-3916371 Laser Diode Controller, listed in alphabetical order. Sub-sections for each path are presented, listing the commands which are legal for that path. See Chapter 3 Figure 3.1 for command path tree structure.
  • Page 61 LASer: n Front Panel n Remote The LASer: command path is used to get to the LDC-3916371 Laser Diode Controller's laser current source commands. The following command paths may be reached from the LASer: command path. LASer:CAL: LASer:ENABle: LASer:LIMit: LASer:MODE: LASer:SET: The following commands may be reached directly from the LASer: command path.
  • Page 62 LASer:BIAS? n Front Panel n Remote The LASer:BIAS? query returns the status of the selected laser channel's photodiode bias selection. SYNTAX DIAGRAM BIAS PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST Photodiode bias is turned off when a *RST command is issued. EXAMPLES "Las:BIAS?"...
  • Page 63 LASer:CALPD? n Front Panel n Remote The LASer:CALPD? query returns the value of the laser's photodiode feedback responsivity (CAL PD parameter) setting for the selected channel. SYNTAX DIAGRAM CALPD PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST If this value is 0, the selected channel’s monitor current/power conversion will not be done.
  • Page 64 POINTS OF INTEREST After this command is issued it is safe to run the LDC-3916371 Laser Diode Controller with the same calibration values used as before the LAS calibration mode was started. This command is intended for use after a false or invalid calibration value is entered, or to exit calibration mode before any values have been entered.
  • Page 65 Since the limit circuit is the same for both high and low bandwidth modes, it is only calibrated once. Both low and high bandwidth are calibrated during this procedure. After this command is issued, the LDC-3916371 Laser Diode Controller will allow calibration of the current set point, measurement, and limit. This procedure is outlined in the Calibration section of the Laser module instruction manual.
  • Page 66 POINTS OF INTEREST After this command is issued, the LDC-3916371 Laser Diode Controller will allow calibration of the laser voltage measurement. This procedure is outlined in the Calibration section of the Laser module instruction manual. The “LAS:CAL:STAT?” query may be used to determine when the unit is ready for a calibration value to be entered.
  • Page 67 POINTS OF INTEREST In remote operation, the LAS:CAL:STAT? query may be used to determine if the LDC-3916371 Laser Diode Controller is ready for the user to enter a value via the LAS:CAL:MEAS command. EXAMPLES "Las:CAL:MEAS 4.95" -action: the LDC-3916371 Laser Diode Controller enters the value 4.95 for calibration value of the present calibration mode.
  • Page 68 n Remote The LASer:CAL:VALUE? query is used at the factory only. LASer:COND? ¨ Front Panel n Remote The LASer:COND? query returns the value of the selected channel’s Laser Condition Status register. SYNTAX DIAGRAM COND PARAMETERS None. The response is the sum of the following: 1 - Laser current limit 256 - Output is off 2 - Laser voltage limit...
  • Page 69 LASer:DEC ¨ Front Panel n Remote The LASer:DEC command decrements the selected channel’s laser constant-current set point by one or more steps. Parameters allow multiple steps to be decremented and the time (in milliseconds) between decrements to be set, respectively. SYNTAX DIAGRAM <white <nrf...
  • Page 70 LASer:ENABle: ¨ Front Panel n Remote The LASer:ENABle: command path is used to get to the selected channel's laser status enable commands and queries. The following commands may be reached directly from the LASer:ENABle: command path. LASer:ENABle:COND LASer:ENABle:EVEnt? LASer:ENABle:COND? LASer:ENABle:OUTOFF LASer:ENABle:EVEnt LASer:ENABle:OUTOFF? LASer:ENABle:COND...
  • Page 71 LASer:ENABle:COND? ¨ Front Panel n Remote The LASer:ENABle:COND? query returns the value of the selected channel's Laser Condition Status Enable register. SYNTAX DIAGRAM COND ENAB PARAMETERS None. The response is the sum of the following: 1 - Laser Current Limit 256 - Output is Off 2 - Laser Voltage Limit 512 - Output In Tolerance...
  • Page 72 LASer:ENABle:EVEnt ¨ Front Panel n Remote The LASer:ENABle:EVEnt command sets the selected channel’s Laser Event Status Enable register. The bits in this register determine which bits in the Event Status register are summarized in the 3916 Status Byte. SYNTAX DIAGRAM <white <nrf ENAB...
  • Page 73 LASer:ENABle:EVEnt? ¨ Front Panel n Remote The LASer:ENABle:EVEnt? query returns the value of the selected channel's Laser Event Status Enable register. SYNTAX DIAGRAM ENAB PARAMETERS None. The response is the sum of the following: 1 - Laser Current Limit Changed State 256 - Output is Off Changed State 2 - Laser Voltage Limit Changed State 512 - Output Changed Tolerance State...
  • Page 74 LASer:ENABle:OUTOFF ¨ Front Panel n Remote The LASer:ENABle:OUTOFF command sets the selected channel’s Laser Output Off Enable register. The bits in this register determine which conditions will cause the laser output to be automatically disabled. SYNTAX DIAGRAM <white <nrf ENAB OUTOFF value>...
  • Page 75 LASer:ENABle:OUTOFF? ¨ Front Panel n Remote The LASer:ENABle:OUTOFF? query returns the contents of the selected channel’s Laser Output Off Enable register. SYNTAX DIAGRAM OUTOFF ENAB PARAMETERS None. The response is the sum of the following: 1 - Laser Current Limit 256 - N/A 2 - Laser Voltage Limit 512 - Output Out of Tolerance...
  • Page 76 LASer:EVEnt? ¨ Front Panel n Remote The LASer:EVEnt? query returns the value of the selected channel's Event Status Register. SYNTAX DIAGRAM PARAMETERS None. The response is the sum of the following: 1 - Laser Current Limit Changed State 256 - Output Is Off Changed State 2 - Laser Voltage Limit Changed State 512 - Output Change Tolerance State 4 - N/A...
  • Page 77 LASer:INC ¨ Front Panel n Remote The LASer:INC command increments the selected channel’s laser constant-current set point by one or more steps. Parameters allow multiple steps to be incremented and the time (in milliseconds) between increments to be set, respectively. SYNTAX DIAGRAM <white <nrf...
  • Page 78 LASer:LDI n Front Panel n Remote The LASer:LDI command sets the laser current setpoint for the selected channel. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value> which represents the (laser) output current, in mA. POINTS OF INTEREST The setpoint is the same for both low and high bandwidth output modes. EXAMPLES "Las:LDI 400"...

  • Page 79: Command Reference Chpt

    LASer:LDV? n Front Panel n Remote The LASer:LDV? query returns the value of the selected channel's measured laser voltage. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST Response is the selected channel's measured laser output voltage, regardless of LAS control mode.
  • Page 80 LASer:LIMit:I n Front Panel n Remote The LASer:LIMit:I command sets the selected channel's Laser current limit value. SYNTAX DIAGRAM <white <nrf value> space> PARAMETERS An <nrf value> which represents the selected channel's Laser limit current, in mA. POINTS OF INTEREST The current limit is in effect in all modes of operation of the selected channel's laser output.
  • Page 81 LASer:LIMit:V n Front Panel n Remote The LASer:LIMit:V command sets the selected channel's Laser compliance voltage limit value. SYNTAX DIAGRAM <white <nrf value> space> PARAMETERS An <nrf value> which represents the selected channel's Laser limit voltage, in volts. POINTS OF INTEREST The compliance voltage limit is in effect in all modes of operation of the selected channel's laser output.
  • Page 82 LASer:LIMit:MDP n Front Panel n Remote The LASer:LIMit:MDP command sets the laser monitor photodiode power limit value. SYNTAX DIAGRAM <white <nrf value> space> PARAMETERS An <nrf value> which represents the selected channel's laser monitor photodiode power limit, in POINTS OF INTEREST When constant MDP mode is used, the selected channel's output is limited (in hardware) only by the LIM I value.
  • Page 83 LASer:MDI n Front Panel n Remote The LASer:MDI command sets the value of the photodiode feedback current set point, in µA. SYNTAX DIAGRAM <white <nrf space> value> An <nrf value> which represents the selected channel's photodiode feedback current, in µA. PARAMETERS POINTS OF INTEREST...
  • Page 84 LASer:MDP n Front Panel n Remote The LASer:MDP command sets the value of the optical power set point, in mW. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value> which represents the selected channel's photodiode feedback power, in mW. POINTS OF INTEREST If the selected channel's mode is not MDP, the LAS:MDP value will not be used.
  • Page 85 LASer:MODE? n Front Panel n Remote The LASer:MODE? query returns the present channel's selected laser control mode. SYNTAX DIAGRAM MODE PARAMETERS None. The response is character data (which represents the LAS operating mode). POINTS OF INTEREST IHBW mode is the same as ILBW mode (low bandwidth), except that the output low bandpass filter is disabled in IHBW mode.
  • Page 86 LASer:MODE: n Front Panel n Remote The LASer:MODE: command path is used to get to the selected channel's laser mode selection commands. The following commands may be reached directly from the LASer:MODE: command path. LASer:MODE:IHBW LASer:MODE:ILBW LASer:MODE:MDI LASer:MODE:MDP LASer:MODE:IHBW n Front Panel n Remote The LASer:MODE:IHBW command selects laser high bandwidth constant current mode for the selected channel.
  • Page 87 LASer:MODE:ILBW n Front Panel n Remote The LASer:MODE:ILBW command selects laser constant current mode. SYNTAX DIAGRAM MODE ILBW PARAMETERS None. POINTS OF INTEREST Constant ILBW mode (low bandwidth) enables the selected channel's output low bandpass filter. EXAMPLES "LAS:MODE:ILBW" -action: sets the selected channel's laser output for constant I mode (low bandwidth).
  • Page 88 LASer:MODE:MDP n Front Panel n Remote The LASer:MODE:MDP command selects constant optical power mode for the present channel. SYNTAX DIAGRAM MODE PARAMETERS None. POINTS OF INTEREST On the front panel, photodetector power mode is referred to as P mode. This mode of laser operation uses the monitor photodiode feedback current to maintain constant optical power.
  • Page 89 LASer:MODulation? n Front Panel n Remote The LASer:MODulation? query returns the status of the selected laser channel's modulation switch. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>, 1 = ON, 0 = OFF. POINTS OF INTEREST More than one channel at a time may be modulated via the modulation signal, if desired. EXAMPLES "Las:MODULATION?"...
  • Page 90 LASer:OUTput? n Front Panel n Remote The LASer:OUTput? query returns the status of the selected channel's laser OUTPUT switch. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST Although the status of the switch is on, the selected channel's output may not have reached the set point value.
  • Page 91 LASer:SET:LDI? n Front Panel n Remote The LASer:SET:LDI? query returns the constant current setpoint which is used for both bandwidth modes. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value> which represents the selected channel's constant I set point value, in mA. POINTS OF INTEREST The LDI set point is only in effect when the LAS operating mode is IHBW or ILBW.
  • Page 92 LASer:SET:MDP? n Front Panel n Remote The LASer:SET:MDP? query returns the selected channel's laser optical power set point value, in mW. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value> which represents the selected channel's constant P set point, in mW. POINTS OF INTEREST This set point is used in constant MDP (P) mode only.
  • Page 93 LASer:STEP? ¨ Front Panel n Remote The LASer:STEP? query is used to read back the selected channel's STEP value. This value, in mA, is used by the Las:Inc and Las:Dec commands to increment or decrement the laser current setpoint. SYNTAX DIAGRAM STEP PARAMETERS None.
  • Page 94 LASer:SYNCLDV? o Front Panel n Remote The LASer:SYNCLDV? query returns the value of the selected channel's measured laser voltage, in volts. SYNTAX DIAGRAM SYNCLDV PARAMETERS None. The response is an <nrf value> representing voltage in Volts. POINTS OF INTEREST This is a “synchronized” measurement: the measurement system is connected to the voltage- measure signal when this query is received.
  • Page 95 LASer:SYNCMDI? o Front Panel n Remote The LASer:SYNCMDI? query returns the value of the selected channel's measured monitor photodiode current in µA. SYNTAX DIAGRAM SYNCMDI None. The response is an <nrf value> representing current in µA. PARAMETERS POINTS OF INTEREST This is a “synchronized”...
  • Page 96 LASer:SYNCMDP? o Front Panel n Remote The LASer:SYNCMDP? query returns the value of the selected channel's measured optical power, in mW. SYNTAX DIAGRAM SYNCMDP PARAMETERS None. The response is an <nrf value> representing optical power in mW. POINTS OF INTEREST Optical power is derived from photodiode current.
  • Page 97 LAS:TOLerance ¨ Front Panel n Remote The LAS:TOLerance command sets the selected module’s laser control tolerance parameters. SYNTAX DIAGRAM <white <nrf <nrf space> value> value> Two <nrf values>; the first represents the measurement window, in mA, µA, or mW, depending PARAMETERS on the laser control mode.
  • Page 98 STATMENU:LINEn: ¨ Front Panel n Remote The STATMENU:LINEn: command path is used to get to the selected channel’s status menu display selection commands. (n can be either 1 or 2). The following commands may be reached directly from the STATMENU:LINEn: command path. STATMENU:LINEn:IPD STATMENU:LINEn:LDI STATMENU:LINEn:PPD...
  • Page 99 STATMENU:LINEn:IPD ¨ Front Panel n Remote The STATMENU:LINEn:IPD command sets the measurement that is to be displayed on line n of the status menu to photodiode current ( IPD ). SYNTAX DIAGRAM STATMENU LINE n PARAMETERS None. POINTS OF INTEREST The default condition of the status menu displays tec temperature ( TEMP ) on line 1 and laser diode current ( LDI ) on line 2.
  • Page 100 STATMENU:LINEn:PPD ¨ Front Panel n Remote The STATMENU:LINEn:PPD command sets the measurement that is to be displayed on line n of the status menu to optical power ( PPD ). SYNTAX DIAGRAM STATMENU LINE n PARAMETERS None. POINTS OF INTEREST Photodetector power is calculated via the CALPD conversion factor.
  • Page 101 STATMENU:LINEn:TEMP ¨ Front Panel n Remote The STATMENU:LINEn:TEMP command sets the measurement that is to be displayed on line n of the status menu to tec temperature ( TEMP ). SYNTAX DIAGRAM STATMENU LINE n TEMP PARAMETERS None. POINTS OF The default condition of the status menu displays tec temperature ( TEMP ) on line 1 and INTEREST laser diode current ( LDI ) on line 2.
  • Page 102 STATMENU:LINEn:RES ¨ Front Panel n Remote The STATMENU:LINEn:RES command sets the measurement that is to be displayed on line n of the status menu to thermistor resistance ( RES ). SYNTAX DIAGRAM STATMENU LINE n PARAMETERS None. EXAMPLES “STATMENU:LINE1:RES” -response: thermistor resistance is displayed on line 1 of the status menu.
  • Page 103 MODERR? ¨ Front Panel n Remote The MODERR? query returns a list of “module” device and command errors. The “module” errors are those which have occurred since the last “MODERR?” query. The errors are notated by a number (code) which corresponds to the type of error which occurred.
  • Page 104 MODPUD ¨ Front Panel n Remote The MODPUD command allows the service technician to enter the protected user data. This data is normally changed only at the factory, and therefore the MODPUD command is not needed by the user. MODPUD? ¨...
  • Page 105 TEC: n Front Panel n Remote The TEC: command path is used to get to the LDC-3916371 Series thermoelectric cooler (TEC) source commands. The following command paths may be reached from the TEC: command path. TEC:CAL: TEC:CONV:R TEC:CONV:DAC_R? TEC:ENABle: TEC:CONV:R?
  • Page 106 POINTS OF INTEREST After this command is issued it is safe to run the LDC-3916371 Laser Diode Controller with the same calibration values used as before the TEC calibration mode was started. This command is intended for use after a false or invalid calibration value is entered, or to exit calibration mode before any values have been entered.
  • Page 107 The TEC:CAL:STAT? query may be used to determine if the module is ready for the user to enter a value via the TEC:CAL:MEAS command. EXAMPLES "TEC:CAL:MEAS 4.95" -action: the LDC-3916371 Laser Diode Controller enters the value 4.95 for calibration value of the present calibration mode. COMMAND REFERENCE...
  • Page 108 The user can also abort calibration using the TEC:CAL:ABORT command. EXAMPLES "Tec:Cal:Stat?" -response: 0, means the LDC-3916371 Laser Diode Controller module is not yet ready for the TEC calibration measurement value to be entered. "TEC:CAL:STAT?" -response: 1, means the module is ready for a calibration measurement to be entered via the “TEC:CAL:MEAS”...
  • Page 109 This command places the module in an automatic calibration mode. It requires the user to enter certain measurements at specified times. The required procedure is described in Chapter 5 of this manual. EXAMPLES "Tec:CAL:V" -action: the LDC-3916371 enters TEC voltage calibration mode. TEC:CAL:VALUE? ¨Front Panel n Remote The TEC:CAL:VALUE? query is used at the factory only.
  • Page 110 TEC:COND? ¨ Front Panel n Remote The TEC:COND? query returns the value of the selected channel’s TEC Condition Status register. SYNTAX DIAGRAM COND PARAMETERS None. The response is the sum of the following: 1 - TE Current Limit 256 - N/A 2 - TE Voltage Limit 512 - Output In Tolerance 4 - N/A...
  • Page 111 Steinhart-Hart equation. POINTS OF INTEREST The LDC-3916371 Laser Diode Controller module uses these constants to convert the thermistor resistance measurement into a temperature. EXAMPLES "Tec:CONST 1, 2.33, 0.5 " -action: sets C1 to 1.000, C2 to 2.330, and C3 to 0.500.
  • Page 112 TEC:CONST? n Front Panel n Remote The TEC:CONST? query returns the values of the selected channel's Steinhart-Hart constants. SYNTAX DIAGRAM CONST PARAMETERS None. The response data represent the values of C1, C2, and C3, respectively. POINTS OF INTEREST These values are pre-scaled so that the exponential value is not given. The actual value of C1 is scaled by 10E-3, C2 by 10E-4, and C3 by 10E-7.
  • Page 113 TEC:CONV:R? ¨ Front Panel n Remote The TEC:CONV:R? query converts thermistor resistance ( KΩ ) to temperature ( °C ) and returns the value of the most recent conversion. SYNTAX DIAGRAM <nrf <white CONV value> space> PARAMETERS Either no parameter or an <nrf value> that corresponds to a resistance in KΩ. POINTS OF INTEREST The calibration constants C1, C2 and C3 are used to convert resistance to temperature.
  • Page 114 TEC:CONV:T ¨ Front Panel n Remote The TEC:CONV:T command converts temperature ( °C ) to thermistor resistance ( KΩ ). SYNTAX DIAGRAM <nrf <white CONV value> space> An <nrf value> that corresponds to a temperature in °C. PARAMETERS POINTS OF INTEREST The selected channel's Steinhart-Hart constants C1, C2 and C3 are used to convert temperature ( °C ) to resistance ( KΩ...
  • Page 115 TEC:CONV:DAC_R? ¨ Front Panel n Remote The TEC:CONV:DAC_R? query converts the DAC count into its equivalent resistance ( KΩ ) and returns the value of the most recent conversion. SYNTAX DIAGRAM <nrf <white CONV DAC_R value> space> PARAMETERS Either no parameter or an <nrf value> that corresponds to a resistance in KΩ. POINTS OF INTEREST The selected channel's DAC count is converted into its equivalent resistance ( KΩ...
  • Page 116 TEC:CONV:R_DAC? ¨ Front Panel n Remote The TEC:CONV:R_DAC? query converts resistance ( KΩ ) to DAC counts and returns the value of the most recent conversion. SYNTAX DIAGRAM <nrf <white CONV R_DAC value> space> PARAMETERS Either no parameters or an <nrf value> that corresponds to a resistance in KΩ. EXAMPLES "TEC:CONV:R_DAC?"...
  • Page 117 TEC:DAC n Front Panel n Remote The TEC:DAC command adjusts the controller set point in DAC counts. See Chapter 2, Understanding DAC Mode for more information about DAC counts. PARAMETERS An <nrf value> that corresponds to an equivalent temperature or resistance. The DAC values can be adjusted to any value between 10 and 65535.
  • Page 118 TEC:ENABle: ¨ Front Panel n Remote The TEC:ENABle: command path is used to get to the selected channel's TEC status enable commands and queries. The following commands may be reached directly from the TEC:ENABle: command path. TEC:ENABle:COND TEC:ENABle:COND? TEC:ENABle:EVEnt TEC:ENABle:EVEnt? TEC:ENABle:OUTOFF TEC:ENABle:OUTOFF? COMMAND REFERENCE...
  • Page 119 TEC:ENABle:COND ¨ Front Panel n Remote The TEC:ENABle:COND command sets the selected channel’s TEC Condition Status Enable register. The bits in this register determine which TEC conditions are summarized in the 3916 Status Byte. SYNTAX DIAGRAM <white <nrf ENAB COND value>...
  • Page 120 TEC:ENABle:COND? ¨ Front Panel n Remote The TEC:ENABle:COND? query returns the value of the selected channel’s TEC Condition Status Enable register. SYNTAX DIAGRAM COND ENAB PARAMETERS None. The response is the sum of the following: 1 - TE Current Limit 256 - N/A 2 - TE Voltage Limit 512 - Output In Tolerance...
  • Page 121 TEC:ENABle:EVEnt ¨ Front Panel n Remote The TEC:ENABle:EVEnt command sets the contents of the selected channel’s TEC Event Status Enable register. The bits in this register determine which events are summarized in the 3916 Status Byte. SYNTAX DIAGRAM <white <nrf ENAB value>...
  • Page 122 TEC:ENABle:EVEnt? ¨ Front Panel n Remote The TEC:ENABle:EVEnt? query returns the value of the selected channel’s TEC Event Status Enable register. SYNTAX DIAGRAM ENAB PARAMETERS None. The response is the sum of the following: 1 - TE Current Limit Changed State 256 - N/A 2 - TE Voltage Limit Changed State 512 - Output Changed Tolerance State...
  • Page 123 TEC:ENABle:OUTOFF ¨ Front Panel n Remote The TEC:ENABle:OUTOFF command sets the contents of the selected channel’s TEC Output Off Enable register. The bits in this register determine which conditions will cause the TEC to automatically shut off. SYNTAX DIAGRAM <white <nrf ENAB OUTOFF...
  • Page 124 TEC:ENABle:OUTOFF? ¨ Front Panel n Remote The TEC:ENABle:OUTOFF? query returns the contents of the selected channel’s TEC Output Off Enable register. SYNTAX DIAGRAM OUTOFF ENAB PARAMETERS None. The response is the sum of the following: 1 - TE Current Limit Condition 256 –...
  • Page 125 TEC:EVEnt? ¨ Front Panel n Remote The TEC:EVEnt? query returns the contents of the selected channel’s TEC Event Status register. Changes that occur in the Condition Status Register are latched in this register. SYNTAX DIAGRAM PARAMETERS None. The response is the sum of the following: 1 - TE Current Limit Changed State 256 - N/A 2 - TE Voltage Limit Changed State...
  • Page 126 TEC:GAIN n Front Panel n Remote The TEC:GAIN command sets the selected channel’s TEC control loop proportional gain. SYNTAX DIAGRAM <white <nrf GAIN space> value> PARAMETERS An <nrf value> between 1 – 127. POINTS OF INTEREST A higher value may make the controller settle to the desired temperature setpoint quicker. A lower value may have less overshoot.
  • Page 127 TEC:ITE n Front Panel n Remote The TEC:ITE command sets the selected channel’s constant TEC current setpoint. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value> which represents the ITE setpoint current, in Amps. POINTS OF INTEREST This set point is only used when the control mode is “ITE”. EXAMPLES "TEC:ITE 1"...
  • Page 128 TEC:LIMit: n Front Panel n Remote The TEC:LIMit: command path is used to get to the selected Channel's TEC limit commands. The following commands may be reached directly from the TEC:LIMit: command path. TEC:LIMit:ITE TEC:LIMit:ITE? TEC:LIMit:THI TEC:LIMit:THI? TEC:LIMit:ITE n Front Panel n Remote The TEC:LIMit:ITE command sets the selected channel’s TEC current limit.
  • Page 129 TEC:LIMit:THI n Front Panel n Remote The TEC:LIMit:THI command sets the selected channel’s TEC high temperature limit. SYNTAX DIAGRAM <white <nrf value> space> An <nrf value> which represents the upper limit of the TEC load temperature, in °C. PARAMETERS POINTS OF INTEREST By default, the TEC controller automatically shuts off if the measured temperature ever gets above this value.
  • Page 130 TEC:MODE? n Front Panel n Remote The TEC:MODE? query returns the selected channel’s present TEC control mode. SYNTAX DIAGRAM MODE PARAMETERS None. The response is a character response. POINTS OF INTEREST The TEC output is controlled so that the chosen quantity (temperature, thermistor resistance, or TEC current) is kept constant.
  • Page 131 TEC:MODE:DAC ¨ Front Panel n Remote The TEC:MODE:DAC command selects the DAC mode for the selected channel’s TEC controller. SYNTAX DIAGRAM MODE PARAMETERS None. POINTS OF INTEREST This mode keeps the DAC count constant, regardless of the load conditions. Changing modes causes the output to be forced off. EXAMPLES "TEC:MODE:DAC"...
  • Page 132 TEC:MODE:R n Front Panel n Remote The TEC:MODE:R command selects constant thermistor resistance mode for the selected channel’s TEC controller. SYNTAX DIAGRAM MODE PARAMETERS None. POINTS OF INTEREST Since sensor resistance is a function of temperature, this mode also controls the TEC output load temperature, but it bypasses the use of the conversion constants for set point calculation.
  • Page 133 TEC:MODE:T n Front Panel n Remote The TEC:MODE:T command selects constant temperature mode for the selected channel’s TEC controller. SYNTAX DIAGRAM MODE PARAMETERS None. POINTS OF INTEREST Since TEC load temperature is derived from sensor resistance, constant R and T modes are related.
  • Page 134 TEC:OUTput? n Front Panel n Remote The TEC:OUTput? query returns the selected channel’s TEC controller OUTPUT switch status. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST Although the status of the switch is on, the selected TEC output may not have reached the set point value.
  • Page 135 TEC:R? n Front Panel n Remote The TEC:R? query returns the selected channel’s measured thermistor resistance. SYNTAX DIAGRAM PARAMETERS None. The response value is the measured thermistor resistance, in kΩ. POINTS OF INTEREST Measured temperature is derived from the thermistor resistance measurement. This measurement is updated approximately once every 600 mSec.
  • Page 136 TEC:SET:ITE? n Front Panel n Remote The TEC:SET:ITE? query returns the selected channel’s constant TE current (ITE) set point value. SYNTAX DIAGRAM PARAMETERS None. The response represents the ITE set point for the selected Channel, in Amps. POINTS OF INTEREST The TEC output is controlled to this set point value only when constant ITE mode is in effect.
  • Page 137 TEC:SET:T? n Front Panel n Remote The TEC:SET:T? query returns the selected channel’s constant temperature set point value. SYNTAX DIAGRAM None. The response represents the set point temperature, in °C. PARAMETERS POINTS OF INTEREST The TEC output is controlled to this set point value only when constant T mode is in effect. EXAMPLES "TEC:SET:T?"...
  • Page 138 TEC:SYNCR? o Front Panel n Remote The TEC:SYNCR? query returns the selected channel’s measured thermistor resistance in kΩ. SYNTAX DIAGRAM SYNCR PARAMETERS None. The response value is an <nrf value> representing resistance in kΩ. POINTS OF INTEREST This is a “synchronized” measurement: the TEC measurement system is connected to the thermistor resistance-measure signal when this query is received.
  • Page 139 TEC:SYNCT? o Front Panel n Remote The TEC:SYNCT? query returns the selected channel’s measured thermistor temperature in °C. SYNTAX DIAGRAM SYNCT None. The response value is an <nrf value> representing temperature in °C. PARAMETERS POINTS OF INTEREST Temperature is derived from the thermistor resistance measurement. This is a “synchronized”...
  • Page 140 TEC:SYNCV? o Front Panel n Remote The TEC:SYNCV? query returns the selected channel’s measured TE forward voltage, in Volts. SYNTAX DIAGRAM SYNCV PARAMETERS None. The response value is an <nrf value> representing voltage in Volts. POINTS OF INTEREST This is a “synchronized” measurement: the TEC measurement system is connected to the voltage-measure signal when this query is received.
  • Page 141 TEC:T? n Front Panel n Remote The TEC:T? query returns the selected channel’s temperature measurement value. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST The measured temperature is valid for all modes of TEC operation. Temperature is continually updated, approximately once every 600 mSec.
  • Page 142 If the mode is constant thermistor resistance (R), the first parameter is a resistance window in kΩ. There are not separate tolerance values for each mode. The LDC-3916371 Laser Diode Controller defaults to a tolerance of 0.2 °C for 5 seconds, unless changed by the TEC:TOLerance command.
  • Page 143 TEC:TOLerance? ¨ Front Panel n Remote The TEC:TOLerance? query returns the selected channel’s TE control tolerance parameters. SYNTAX DIAGRAM None. The response consists of two data units, the first represents the tolerance window, in °C, PARAMETERS kΩ, or Amps (depending on the mode). The second represents the tolerance duration, in seconds.
  • Page 144 CHAPTER 5 CALIBRATION AND TROUBLESHOOTING GUIDE INTRODUCTION CALIBRATION OVERVIEW Recommended Equipment LOCAL CALIBRATION OF THE TEMPERATURE CONTROLLER Thermistor Calibration ITE Current Calibration TE Voltage Calibration LOCAL CALIBRATION OF THE LASER CURRENT SOURCE Current Source Calibration IPD Current Calibration Laser Forward Voltage Measurement Calibration REMOTE CALIBRATION OF THE 3916371 CONTROLLER Thermistor Calibration ITE Current Calibration...
  • Page 145 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 146: Chapter 5 Calibration And Troubleshooting Guide

    CHAPTER 5 CALIBRATION AND TROUBLESHOOTING GUIDE INTRODUCTION This chapter describes calibration of your 3916371 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 147 It will be necessary to connect various loads and circuits to the outputs of the module for the calibration procedure. The devices required for most of the calibration loads are listed in Table 5.2. A schematic is shown in Figure 5.1 for the photodiode calibration circuit, with the required components listed in Table 5.3.

  • Page 148: Local Calibration Of The Temperature Controller

    LOCAL CALIBRATION OF THE TEMPERATURE CONTROLLER Thermistor Calibration The following procedure is for calibrating the thermistor current source so that the thermistor resistance measurement for these ranges will meet the stated accuracy specifications. Install the module into a 3916 mainframe. Turn on the mainframe and allow it to warm up for at least one hour.

  • Page 149: Ite Current Calibration

    ITE Current Calibration The following procedure is for calibrating the TE current source. The internal calibration procedure sets the current to two negative values and two positive values. You must enter the exact current that you measure at each of these points.

  • Page 150: Local Calibration Of The Laser Current Source

    TE Voltage Calibration The following procedure is for calibrating the TE voltage measurement. The internal calibration procedure sets the current to a negative value and a positive value. You must enter the exact voltage that you measure at both of these points.

  • Page 151: Current Source Calibration

    Current Source Calibration The following procedure is for calibrating the laser current source. The internal calibration procedure sets the current to two values. You must enter the exact Laser Diode current that you measure at both of these points. The internal procedure will then use this information to calibrate the current source.

  • Page 152: Ipd Current Calibration

    IPD Current Calibration The following procedure is for calibrating the LASER I PD (photodiode monitor) measurement circuit. The internal calibration procedure sets the current to two values. You must enter the resulting I PD (photodiode monitor) current that you measure at both of these points. The internal procedure will then use this information to calibrate the I PD measurement circuit.

  • Page 153: Remote Calibration Of The 3916371 Controller

    Then measure the voltage across the load resistor, enter that value (in Volts) into the highlighted “VReal” adjust field on the screen, and press (ADJUST) ENTER. Do not enter more than seven characters, including the decimal point. The internal calibration procedure will then drive the LD current to approximately 75% of full range. Allow the current to settle for at least 10 seconds.
  • Page 154 If this calibration value is to be measured and entered remotely via a GPIB controlled DMM, for example, the actual value of the resistance should not be entered until the LDC-3916 controller is ready to receive it. Check to see if the internal cal procedure is ready for a measurement, send the following query to the module: TEC:CAL:STATUS? The cal procedure is ready for a measurement if it returns the value “1”.

  • Page 155: Ite Current Calibration

    ITE Current Calibration The following procedure is for remotely calibrating the TE current source. The internal calibration procedure sets the current to two negative values and two positive values. You must measure the current at each of these points and send the measurements to the module over GPIB.
  • Page 156 NOTE The internal cal procedure will store this value and briefly change its measurement status to “0” to indicate that it is not yet ready for another measurement. This will occur after each time a new measurement is entered. The controller will set the output current to approximately 25% of its negative output range. Allow the current to settle for at least 10 seconds.

  • Page 157: Te Voltage Calibration

    After you have entered the last measured current, the internal calibration procedure will perform the calibration for the current setpoint, measurement, and limit circuits. The cal procedure will set the status to the value “2” to indicate that it has finished. TE Voltage Calibration The following procedure is for remotely calibrating the TE voltage measurement circuit.

  • Page 158: Laser Current Source Calibration

    Enter the actual measured TE voltage: TEC:CAL:MEAS (voltage in Volts) e.g. TEC:CAL:MEAS 2.94 After you have entered the second measured voltage, the internal calibration procedure will perform the calibration for the voltage measurement circuit. The cal procedure will then set the status to the value “2” to indicate that it has finished.

  • Page 159: Ipd Current Calibration

    Check to see if the internal cal procedure is ready for the measurement. Send the following query to the module: LAS:CAL:STATUS? The cal procedure is ready for a measurement if it returns the value “1”. Query the status until the value that is returned is “1”.
  • Page 160 NOTE “MDI” stands for “Monitor Diode Current”. The internal calibration procedure will turn on the output and drive the laser current until the PD current is approximately 15% of full range. Allow the current to settle for at least 10 seconds. If this calibration value is to be measured and entered remotely via a GPIB controlled DMM, for example, the actual value of the current should not be entered until the LDC-3916 controller is ready to receive it.

  • Page 161: Laser Forward Voltage Measurement Calibration

    Laser Forward Voltage Measurement Calibration The following procedure is for remotely calibrating the laser forward voltage measurement circuit. The module’s internal calibration procedure sets the current to two values. You must measure and enter the forward voltage at both of these points. The module’s internal cal procedure will then use this information to calibrate the voltage measurement system.
  • Page 162 After you have entered the second measured voltage, the internal calibration procedure will perform the calibration for the laser forward voltage measurement circuit. The cal procedure will then set the status to the value “2” to indicate that it has finished. This ends the calibration guide.

  • Page 163: Troubleshooting Guide

    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. If you encounter problems which are beyond the scope of this guide, contact your ILX Lightwave customer service representative.
  • Page 164 Check that the AC power cord connection is secure. Power-line drop-outs may reset the unit and when power is restored, the output will be off. Unable to adjust output Make sure that the ISET adjust parameter is highlighted. Check the I LIMIT parameter; it should be set above 0 and above the laser operating current.
  • Page 165 Output goes off intermittently Check that the AC power cord connection is secure. Power-line drop-outs may reset the unit and when power is restored, the output will be off. Check the TE module connections. A high impedance on the TE load may cause the output to exceed the compliance voltage momentarily.

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