ILX Lightwave LDC-3916370 Series User Manual
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ILX Lightwave LDC-3916370 Series User Manual

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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 Laser Controller Modules -3916370 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 70027005_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

    Product Overview ................................2 Initial Inspection................................2 Installing your LDC-3916370 Series Laser Diode Controller Module................2 LDC-3916370 Series Controller Module Specifications ....................4 Chapter 2 How to Operate Your LDC-3916370 Series 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-3916370 SERIES CONTROLLER MODULES INTRODUCTION SAFETY SYMBOLS AND TERMS PRODUCT OVERVIEW INITIAL INSPECTION INSTALLING YOUR LDC-3916370 SERIES LASER DIODE CONTROLLER MODULE Installation into LDC-3916 Laser Diode Controller Mainframe General Shipping Instructions LDC-3916370 SERIES 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-3916370 Series Controller Modules

    INTRODUCTION TO THE LDC-3916370 SERIES CONTROLLER MODULES INTRODUCTION This chapter is an introduction to the LDC-3916370 Series Laser Diode Controller Modules for the LDC-3916 LD Controller Mainframe containing unpacking information, instructions on how to install and apply power, and safety considerations and instructions.

  • Page 13: Product Overview

    Instrument Power On PRODUCT OVERVIEW The LDC-3916370 Series Laser Diode Controller Modules are a combination current source/temperature controller. The current source provides high stability output of either 500 mA, 1 Amp, or 1.5 Amp with fully redundant current limits and multiple laser protection features such as contact bounce detection, compliance voltage limit adjust and 4- wire voltage measurement for precise laser diode forward voltage measurement.

  • Page 14: General Shipping Instructions

    Attach a tag to the module identifying the owner and indicating the service or repair needed. Include the model number, serial number, and return authorization number. We suggest that you insure the shipment. See your LDC- 3916 Mainframe manual for instructions on where to ship the module. INTRODUCTION TO THE LDC-3916370 SERIES CONTROLLER MODULE CHPT 1 PAGE 3...

  • Page 15: Ldc-3916370 Series Controller Module Specifications

    Maximum output current transient resulting from a 1000V power-line transient spike. Maximum monitor photodiode current drift over any 30 minute period. Assumes zero drift in responsivity of photodiode. Modulation input is 50Ω terminated inside the mainframe. INTRODUCTION TO THE LDC-3916370 SERIES CONTROLLER MODULE CHPT 1 PAGE 4...

  • Page 16: Temperature Controller Specifications

    Using a 10 k Ω thermistor, controlling an LDM-4412 mount over 0 °C to +90 °C 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-3916370 SERIES 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-3916370 Series Controller Module

    HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE INTRODUCTION This chapter introduces you to the operation of the LDC-3916370 Series LD Controllers’ Laser 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, Constant Power Mode, and to operate the temperature controller in Constant Temperature Mode.

  • Page 21: Connecting To The Laser Controller

    CONNECTING TO THE LASER CONTROLLER When connecting your laser diode or any other sensitive devices to the LDC-3916370 Series Laser Diode Controller Modules, we recommend that the instrument be powered up and the LASER output be off. In this condition, a low impedance shunt is active across the output terminals.
  • Page 22 There are connections provided for laser cathode and anode, photodiode cathode and anode, chassis ground, interlock, and laser forward voltage. The pin-out diagram for this connector is shown in Figure 2.2. HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE CHPT 2 PAGE 3 Artisan Technology Group - Quality Instrumentation ...

  • Page 23: Interlock Connections

    Four-Wire Voltage Sense The LDC-3916370 Series Modules have a 4-wire voltage sense feature. The laser voltage is sensed through a pair of connections (pins 4 and 8) that is separate from the laser current drive connections (pins 5 and 9). This allows a more accurate laser voltage reading for the voltage limit feature.

  • Page 24: Connecting To The Tec Controller

    (10 or 100 µA) flows from pin 7 to pin 8, which develops a voltage for calculating thermistor resistance. Pins 9-15 are reserved by ILX Lightwave for diagnostics purposes and must not be connected to anything in your system.

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

    OPERATING A LASER IN CONSTANT CURRENT (I) MODE Suppose you have an LDC-3916370 Series 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: Setting The Current Limit

    “OPERATING A LASER IN CONSTANT POWER MODE, P”. The laser optical power limit can be disabled by setting the CalPD value to zero on page 2 of the laser setup menu. HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE CHPT 2 PAGE 7 Artisan Technology Group - Quality Instrumentation ...

  • Page 27: Enabling The Modulation Input

    Each single channel current source can be turned on or off independently as described above, or you can turn on all the channel sources at the same time from the All Chnl menu. See the LDC-3916 Mainframe Instruction Manual for more information on the all channel operation. HOW TO OPERATE YOUR LDC-3916370 SERIES 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-3916370 Series Controller Modules allow you to operate the instrument current source drivers in Constant Optical Power (P) mode. In the “P”...

  • Page 29: Setting The Current Limit

    This is a software limit only. The LASER output is normally turned off if this limit is reached. HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE CHPT 2 PAGE 10 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 30: Adjusting The Constant Power Setting

    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-3916370 Series module specifications in chapter 1 for modulation input specifications and limitations.

  • Page 31: Conditions Which Will Automatically Shut Off The Laser Output

    LASER output is active. The LDC-3916370 Series 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 32: Laser Error Indicators

    Laser Error Indicators The LDC-3916370 Series Laser Diode Current Source Controllers indicate general LASER operational error conditions. When an error occurs, the Error Indicator Code will appear on the Status page, the Chan page, or the LAS Setup pages for the respective channel. The Error Indicator Code will clear if you exit any page that it appears on. The output drive will shut off when any laser error occurs.

  • Page 33: Operating The Tec Controller From The Front Panel

    OPERATING THE TEC CONTROLLER FROM THE FRONT PANEL This section describes how to operate your LDC-3916370 Series 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). Operating in Constant Temperature Mode is presented in the following sections, however the same operating principles apply to the other operating modes.

  • Page 34: Selecting The Tec Control Mode

    Next, use the (ADJUST) UP/DOWN ARROW keys, knob, or the keypad to enter the desired value of 25 HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE CHPT 2 PAGE 15 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 35: Setting Tec Current Limit

    The allowed GAIN values in the LDC-3916370 Series 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 36: Temperature Controller Sensor Selection

    SENSOR range to 100 µA. Your LDC-3916370 Series Temperature Controller operates in a closed loop fashion with a temperature sensor being the feedback element. The only temperature sensor allowed for these controller modules is the thermistor type.

  • Page 37: Conditions Which Will Automatically Shut Off The Tec Output

    Sensor Range Changed (while output is on, E409) Sensor Shorted (while output is on, E415) TEC Mode Changed (while output is on, E435) HOW TO OPERATE YOUR LDC-3916370 SERIES CONTROLLER MODULE CHPT 2 PAGE 18 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 38: Tec Error Indicators

    TEC ERROR INDICATORS The LDC-3916370 Series 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 if you exit any page that it appears on. TEC Error Indicator Codes are summarized in Table 2.4.
  • Page 39 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 40 CHAPTER 3 OPERATING IN REMOTE CONTROL INTRODUCTION REMOTE CONFIGURATION LDC-3916370 SERIES LASER DIODE CONTROLLER COMMAND SET LDC-3916370 Series 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 Artisan Technology Group - Quality Instrumentation ...
  • Page 41 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 42: Chapter 3 Operating In Remote Control

    LDC-3916370 SERIES LASER DIODE CONTROLLER COMMAND SET The LDC-3916370 Series module utilizes its own module-specific commands, as well as the commands for the LDC- 3916 mainframe (see LDC-3916 Instruction Manual Chapter 3 “Operating in Remote Control”). Figure 3.1 shows all of the commands which are usable by the LDC-3916 in conjunction with the LDC-3916370 Series modules.
  • Page 43 :SEN :SYNCV? :OUTOFF? :STAT? :VALUE? :TOL :TOL? Figure 3.1 LDC-3916 and LDC-3916370 Series Laser Diode Controller Command Path Structure OPERATING IN REMOTE CONTROL CHPT 3 Page 2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 44 LDC-3916370 Series Laser Diode Controller Often Used Commands The LDC-3916370 Series 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.

  • Page 45: Status Reporting

    Table 3.1 LDC-3916370 Series Often Used Commands Command Timing and Completion All commands for the LDC-3916370 Series modules are sequential, except for the “LAS:OUT ON”, “LAS:INC”, and “LAS:DEC” commands. The “LAS:OUT ON” command is overlapped to allow the user to abort it with the “LAS:OUT OFF”...
  • Page 46 our example, you must also set the Service Request Enable Register, e. g. “*SRE 1”, to allow the ALLEVE summary to generate the interrupt. See the LDC-3916 Instruction Manual, Chapter 3, for details on status structures. NOTE When the laser voltage reaches the voltage limit setting (LAS:LIM:V), the hardware will always shut the laser output off.
  • Page 47 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 48 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 49 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-3916370 Series 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 50 6- N/A 14- N/A 7- N/A 15- N/A Figure 3.4 LDC-3916370 Series Laser Diode Controller LASER Output Off Register OPERATING IN REMOTE CONTROL CHPT 3 Page 9 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 51 14- N/A 7- TEC Module Open (output on) Cond. 15- N/A Figure 3.5 LDC-3916370 Series Laser Diode Controller TEC Output Off Register OPERATING IN REMOTE CONTROL CHPT 3 Page 10 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 52 Error Messages This section contains descriptions of the errors which are specific to the LDC-3916370 Series modules. These are the error codes that are returned from the “MODERR?” query. Refer to the LDC-3916 Laser Diode Controller Instruction Manual, Chapter 3, for a list of LDC-3916 mainframe error codes and descriptions (the codes returned from the “ERR?”...
  • Page 53 Calibration Measurement Entered Before Calibration was Ready. E-803 Attempted to Enter Invalid Calibration Mode. Table 3.3 LDC-3916370 Series Error Message Codes OPERATING IN REMOTE CONTROL CHPT 3 Page 12 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 54 CHAPTER 4 COMMAND REFERENCE INTRODUCTION LDC-3916370 SERIES DEVICE-DEPENDENT COMMANDS LDC-3916370 SERIES 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

    COMMAND REFERENCE INTRODUCTION This chapter is a guide to all of the device-dependent commands for the LDC-3916370 Series 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-3916370 Series.
  • Page 57 Used at factory to set calibration information. MODPUD? NONE Returns factory set calibration information. Table 4.1 LDC-3916370 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-3916370 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-3916370 Series Device-Dependent Commands (Cont.) LDC-3916370 Series Device-Dependent Commands NAME PARAMETERS FUNCTION TEC:MODE:ITE NONE Sets the mode to constant TEC current mode. TEC:MODE:R NONE Sets the mode to constant thermistor resistance mode. TEC:MODE:T NONE Sets the TEC mode to constant temperature mode.

  • Page 60: Ldc-3916370 Series Device-Dependent Commands

    Command Description Format LDC-3916370 SERIES DEVICE-COMMAND REFERENCE The following pages contain a reference for the device-dependent commands of the LDC-3916370 Series Laser Diode Controller. This reference contains useful information for both local and remote operation of your Laser Diode Controller.
  • Page 61 LASer: n Front Panel n Remote The LASer: command path is used to get to the LDC-3916370 Series Laser Diode Controller's laser current source commands. The following command paths may be reached from the LASer: command path. LASer:CAL: LASer:MODE: LASer:ENABle:...
  • 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-3916370 Series 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-3916370 Series 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-3916370 Series 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 "LAS:CAL:STAT?" -response: 2, means the LDC-3916370 Series Laser Diode Controller has completed the LAS calibration. "LAs:Cal:Stat?" -response: 0, means the LDC-3916370 Series Laser Diode Controller is not yet ready for the LAS calibration measurement value to be entered. COMMAND REFERENCE...
  • Page 68 LASer:CAL:VALUE? ¨Front Panel 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 –...
  • 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 –...
  • 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 Changed 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:I? n Front Panel n Remote The LASer:LIMit:I? query returns the value of the selected channel's Laser current limit. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST The selected channel's current limit is valid for all modes of Laser operation. EXAMPLES "LAS:LIM:I?"...
  • Page 82 LASer:LIMit:V? n Front Panel n Remote The LASer:LIMit:V? query returns the value of the selected channel's Laser compliance voltage limit. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST The selected channel's compliance voltage limit is valid for all modes of Laser operation. EXAMPLES "LAS:LIM:V?"...
  • Page 83 LASer:LIMit:MDP? n Front Panel n Remote The LASer:LIMit:MDP? query returns the value of the selected channel's laser monitor PD power limit. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF INTEREST The LAS:LIM:MDP is in effect for all LAS operating modes. EXAMPLES "LAS:LIM:MDP?"...
  • Page 84 LASer:MDI? n Front Panel n Remote The LASer:MDI? query returns the value of the selected channel's laser photodetector current measurement, in µA. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. POINTS OF The response is in µA. The response is valid, even when the unit is not in MDI mode. INTEREST This measurement is updated approximately once every 600 msec.
  • Page 85 LASer:MDP? n Front Panel n Remote The LASer:MDP? query returns the value of the selected channel's laser photodetector power measurement, in SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value>. 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 msec.
  • 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 command turns the selected channel's laser output on or off. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value>; 1 = on, 0 = off. POINTS OF INTEREST After the selected channel's output is turned on, it may be useful to wait until the output is fully on before performing further operations, but it is not necessary.
  • Page 91 LASer:SET: n Front Panel n Remote The LASer:SET: command path is used to get to the selected channel's laser set point queries. The following commands may be reached directly from the LASer:SET: command path. LASer:SET:LDI? LASer:SET:MDI? LASer:SET:MDP? 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.
  • Page 92 LASer:SET:MDI? n Front Panel n Remote The LASer:SET:MDI? query returns the selected channel's laser monitor photodiode current set point value, in µA. SYNTAX DIAGRAM PARAMETERS None. The response is an <nrf value> which represents the selected channel's constant IPD set point value, in µA.
  • Page 93 LASer:STEP ¨ Front Panel n Remote The LASer:STEP command specifies the amount the current setpoint will change in response to the LASer:INC or LASer:DEC command. SYNTAX DIAGRAM <white <nrf STEP space> value> PARAMETERS An <nrf value> of the step amount, in the range 1.0 to 100.0. The resolution is 0.1. POINTS OF INTEREST The step of 0.1 corresponds to 0.1 mA.
  • Page 94 LASer:SYNCLDI? o Front Panel n Remote The LASer:SYNCLDI? query returns the value of the selected channel's measured laser current, in mA. SYNTAX DIAGRAM SYNCLDI PARAMETERS None. The response is an <nrf value> representing current in mA. POINTS OF INTEREST This is a “synchronized” measurement: the measurement system is connected to the current- measure signal when this query is received.
  • Page 95 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 96 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 97 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 98 µA. If the mode is constant power (P), the first parameter is in mW. The range of the second parameter, the time window, is 0.1 to 50.0. The LDC-3916370 Series Laser Diode Controller defaults to a tolerance of 100 mA, µA, or mW, for 5 seconds, unless changed by the LAS:TOLerance command.
  • Page 99 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 100 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 101 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 102 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 103 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 104 ¨ Front Panel MODERR? 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 105 ¨ Front Panel MODPUD 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. ¨ Front Panel MODPUD? n Remote The MODPUD? query returns protected user data from a module.
  • Page 106 TEC: n Front Panel n Remote The TEC: command path is used to get to the LDC-3916370 Series thermoelectric cooler (TEC) source commands. The following command paths may be reached from the TEC: command path. TEC:CAL: TEC:CONV:R TEC:ENABle: TEC:CONV:R? TEC:LIMit:...
  • Page 107 POINTS OF INTEREST After this command is issued it is safe to run the LDC-3916370 Series 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 108 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-3916370 Series Laser Diode Controller enters the value 4.95 for calibration value of the present calibration mode. COMMAND REFERENCE...
  • Page 109 TEC:CAL:SENsor n Front Panel n Remote The TEC:CAL:SENsor command initiates the selected channel’s thermistor resistance calibration procedure. SYNTAX DIAGRAM <white <nrf value> space> An <nrf value> which represents the thermistor sense current range, 1 = 100 µA, 2 = 10 µA. PARAMETERS POINTS OF INTEREST...
  • Page 110 TEC:CAL:ABORT command. EXAMPLES "Tec:Cal:Stat?" -response: 0, means the LDC-3916370 Series 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 111 TEC:CAL:VALUE? ¨Front Panel n Remote The TEC:CAL:VALUE? query is used at the factory only. 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...
  • Page 112 Steinhart-Hart equation. POINTS OF INTEREST The LDC-3916370 Series 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 113 TEC:CONV:R ¨ Front Panel n Remote The TEC:CONV:R command converts thermistor resistance ( KΩ ) to temperature ( °C ). SYNTAX DIAGRAM <nrf <white CONV value> space> PARAMETERS An <nrf value> that corresponds to a resistance in KΩ. POINTS OF INTEREST The selected channel's Steinhart-Hart constants C1, C2 and C3 are used to convert resistance ( KΩ...
  • 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: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 116 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 117 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 118 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 119 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 120 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 121 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 - Sensor Type Changed 2 - TE Voltage Limit Condition 512 - Output Out of Tolerance...
  • Page 122 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 123 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 124 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 125 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? COMMAND REFERENCE CHPT 4 PAGE 70 Artisan Technology Group - Quality Instrumentation ...
  • Page 126 TEC:LIMit:ITE n Front Panel n Remote The TEC:LIMit:ITE command sets the selected channel’s TEC current limit. SYNTAX DIAGRAM <white <nrf value> space> PARAMETERS An <nrf value> representing the limit value of the TE current, in Amps. POINTS OF INTEREST Although the TEC:LIM:ITE value is positive, it limits both polarities of the TE current. EXAMPLES "TEC:LIM:ITE 1.5"...
  • Page 127 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 128 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 129 TEC:MODE:ITE n Front Panel n Remote The TEC:MODE:ITE command selects constant TE current mode for the selected channel’s TEC controller. SYNTAX DIAGRAM MODE PARAMETERS None. POINTS OF INTEREST This mode keeps the TEC current constant, regardless of load temperature variations. Changing modes causes the output to be forced off.
  • Page 130 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 131 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 132 TEC:R n Front Panel n Remote The TEC:R command sets the selected channel’s constant-resistance setpoint. SYNTAX DIAGRAM <white <nrf space> value> PARAMETERS An <nrf value> which represents the thermistor set point value, in Ohms. POINTS OF INTEREST The R set point is used to control the TEC output in R mode only. The range for the R setpoint parameter is 0.001 to 500.0 kΩ.
  • Page 133 TEC:SENsor n Front Panel n Remote The TEC:SENsor command sets the selected channel’s thermistor sense current. SYNTAX DIAGRAM <white <nrf space> value> An <nrf value> which represents the thermistor sense current. 1 = 100 µA, 2 = 10 µA. PARAMETERS POINTS OF INTEREST The thermistor sense current effects the measurement range of the thermistor.
  • Page 134 TEC:SET: n Front Panel n Remote The TEC:SET: command path is used to get to the selected channel's TEC set point queries. The following commands may be reached directly from the TEC:SET: command path. TEC:SET:ITE? TEC:SET:R? TEC:SET:T? 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.
  • Page 135 TEC:SET:R? n Front Panel n Remote The TEC:SET:R? query returns the selected channel’s constant thermistor resistance set point value. SYNTAX DIAGRAM PARAMETERS None. The response represents the set point thermistor resistance value, in kΩ. POINTS OF INTEREST The TEC output is controlled to this set point value only when constant R mode is in effect. EXAMPLES "TEC:SET:R?"...
  • Page 136 TEC:SYNCI? o Front Panel n Remote The TEC:SYNCI? query returns the selected channel’s measured TE current, in Amps. SYNTAX DIAGRAM SYNCI PARAMETERS None. The response is an <nrf value> representing current in Amps. POINTS OF INTEREST This is a “synchronized” measurement: the TEC measurement system is connected to the current-measure signal when this query is received.
  • Page 137 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 138 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 139 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 140 TEC:T n Front Panel n Remote The TEC:T command sets the selected channel’s constant temperature set point value. SYNTAX DIAGRAM <white <nrf space> value> An <nrf value> which represents the constant temperature setpoint value, in °C. PARAMETERS POINTS OF INTEREST The temperature will be controlled to this set point only when the TEC is operated in T mode.
  • Page 141 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-3916370 Series Laser Diode Controller defaults to a tolerance of 0.2 °C for 5 seconds, unless changed by the TEC:TOLerance command.
  • Page 142 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 143 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • 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 3916370 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 3916370 Series 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 100 µA and 10 µA thermistor current sources 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: Te Voltage Calibration

    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: Local Calibration Of The Laser Current Source

    LOCAL CALIBRATION OF THE LASER CURRENT SOURCE There are three calibration adjustments for the LASER current source of the 3916370 Series Laser Diode Controller Module. They are: calibration of the constant current (LDI) source, calibration of the constant light power (I PD ) feedback circuit, and calibration of the laser forward voltage (LDV) measurement.

  • 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 3916370 Controller

    The internal calibration procedure will then drive the LD current to approximately 18% of full range. Allow the current to settle for at least 10 seconds. g. Measure the actual voltage across the load resistor, enter that value (in Volts) into the highlighted “VReal”...
  • 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

    TE Voltage Calibration The following procedure is for remotely calibrating the TE voltage measurement circuit. The internal calibration procedure sets the current to two values. You must measure the voltage at each of these points and send the measurements to the module over GPIB. The internal procedure will then use this information to calibrate the TE voltage measurement circuit.

  • Page 158: Laser Current Source Calibration

    Laser Current Source Calibration There are three calibration adjustments for the Laser current source of the 3916370 Series Laser Diode Controller Module. They are: calibration of the constant current (LDI) source, calibration of the laser forward voltage (LDV) measurement, and calibration of the constant light power (I PD ) feedback circuit. LDI Calibration The following procedure is for remotely calibrating the laser current source.

  • Page 159: Ipd Current Calibration

    Enter the measured current in mA by sending the following command: LAS:CAL:MEAS (current in mA) e.g. LAS:CAL:MEAS 267.878 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.

  • Page 160: Laser Forward Voltage Measurement Calibration

    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 Connect a calibrated voltmeter across the load resistor (“plus” lead to Anode). Enter the Laser voltage measurement calibration mode by sending the following command over GPIB: LAS:CAL:LDV The internal cal procedure will begin by setting the Laser output current to approximately 4% of its full range.

  • Page 162: 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 163 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. Check the VLIMIT parameter, the voltage limit should be set above the operating voltage of your laser load. Power Mode operation has high output current, Check the photodiode bias.
  • Page 164 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.

This manual is also suitable for:

Ldc-3916372Ldc-3916374Ldc-3916376

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