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Newport LDX-3232 User Manual

High compliance current source
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User's Guide
High Compliance Current Source
LDX-3232
70037802 November 2017

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Summary of Contents for Newport LDX-3232

  • Page 1 User’s Guide High Compliance Current Source LDX-3232 70037802 November 2017...

  • Page 3: Table Of Contents

    Chapter 1 : Introduction and Specifications ............9   Product Overview ......................... 9   Initial Inspection ..........................9  Installing the LDX-3232 High Compliance Current Source ..........10   Grounding Requirements ......................10  AC Line Power Requirements ....................10  GPIB Connector .......................... 10 ...
  • Page 4 Using the LDX-3232 in Constant Power (P) Mode ..............20  Error Indicators ........................... 20  Automatic Laser Output Shut Off Conditions ................21  Chapter 3 : Remote Operation ................23   Reading the GPIB Address ......................23  Changing the GPIB Address ....................... 23 ...
  • Page 5 Figure 3.1 Common Command Structure .................. 27 Figure 3.2 LDX-3232 Status Reporting Schematic Diagram ............29 Figure 3.3 LDX-3232 Output Off Register & Defaults ..............30 Figure 3.4 IPD Calibration Circuit ....................56 Figure 6.1 November 2017 70037802 LDX-3232 Manual...
  • Page 6 Table 3.2 LDX-3232 Error Codes....................31 Table 3.3 Remote Command Summary Reference List ............33 Table 4.1 LDX-3232 Default Settings (Bin 0) ................51 Table 5.1 Recommended Test Equipment ................56 Table 6.1 Calibration Circuit Components ................56 Table 6.2 Current Calibration Configuration Setup ..............

  • Page 7: Safety And Warranty Information

    All instruments returned to ILX Lightwave are required to have a Return Material Authorization (RMA) number assigned by an official representative of ILX Lightwave Corporation. See “Returning an Instrument” on page 5 for more information. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 8: Safety Symbols

    Shock Terminal Terminal On: In position of push control. Of: Out position of push control. The (I) denotes that the mains The (O) denotes that the mains are on. are on. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 9 The factory will supply a quotation for estimated costs of repair. The customer is responsible for negotiation and settlement with the carrier for the amount of damage. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13...
  • Page 10 ILX Lightwave recommends insuring the shipment. If the original shipping container is not available, place the instrument in a container with at least 3 inches (7.5cm) of compressible packaging material on all sides. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13...

  • Page 11: Chapter 1 : Introduction And Specifications

     Maintenance Information  Instrument Specifications If any of the following symptoms exist, or are even suspected, remove the LDX-3232 from service. Do not use the LDX-3232 until trained service personnel can verify safe operation. Visible damage Severe transport stress...

  • Page 12: Installing The Ldx-3232 High Compliance Current Source

    Before connecting the LDX-3232 High Compliance Current Source to a power source, verify that the AC power source matches the setting of the LDX-3232's voltage printed on the rear panel of the instrument. To avoid electrical shock hazard, connect the instrument to properly earth-grounded, 3-prong receptacles only.

  • Page 13: Operating The Ldx-3232 Precision Current Source

    Operating the LDX-3232 Precision Current Source The following photos show the functional keypad groupings, back panel connectors, and so on. Use these figures to become familiar with the LDX-3232. After that, use Chapter 2 for fundamentals of instrument operation. LDX-3232 Front View Figure 1.1...

  • Page 14: Specifications

    0 - 10 V, 1 k Transfer Function 200 mA / V 400 mA / V Bandwidth (3 dB) DC to 250 kHz High Bandwidth Low Bandwidth DC to 10 kHz November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 15 Responsivity value is user-defined and is used to calculate the optical power. Four wire voltage measured at the load. Voltage measurement accuracy while driving calibration load. Accuracy is dependent upon load and cable used. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13...

  • Page 16: Available Options And Accessories

    Available Options and Accessories Options and accessories available for the LDX-3232 High Compliance Current Source include the following: Accessories List Table 1.2 DESCRIPTION MODEL NUMBER Low Noise CW Filter, 9-pin DSUB LNF-320 Driver to Mount Cable, 5 Amp, DB9 Male to DB9 Male...

  • Page 17: Chapter 2 : Operation

    When disconnecting devices, it is only necessary to turn the current source output off. It is also recommended that the connections to the LDX-3232 output be made using twisted wire pairs with an earth-grounded shield (see Figures 2.1 - 2.4). The output terminals of the instrument are left floating relative to earth ground to suppress AC power-on/power-off transients that may occur through an earth- ground path.

  • Page 18: Figure 2.1 Common Laser Cathode & Photodiode Cathode

    Note: Cable connections to the laser must be secure. Loose connections can cause momentary open circuits that can damage the laser. Figures 2.1 – 2.4 show the possible configurations of connecting laser diodes and photodiodes with the LDX-3232 High Compliance Laser Current Source. Common Laser Cathode & Photodiode Cathode Figure 2.1 Common Laser Cathode &...

  • Page 19: Interlock Connections

    The 9-pin connector marked CURRENT SOURCE on the back panel is used to connect the laser diode to the LDX-3232. There are connections provided for laser cathode and anode, photodiode cathode and anode, chassis ground and interlock. The pinout diagram for this connector is shown in Figure 2.5.

  • Page 20: Setting The Pd Bias

    Setting the PD Bias The LDX-3232 provides an adjustable reverse bias of 0-5 VDC for the photodiode. To set the photodiode bias to 5 V reverse bias, turn the back panel PD BIAS ADJUST fully clockwise. To set the photodiode bias to 0 V reverse bias, turn the back panel PD BIAS ADJUST fully counter- clockwise.

  • Page 21: Setting Up The Ldx-3232 Precision Current Source

    Setting Up the LDX-3232 Precision Current Source The following section describes the functionality of the front panel. Mode Selection The LDX-3232 has three modes in which it can be driven:  Constant Current – Low Bandwidth  Constant Current – High Bandwidth ...

  • Page 22: Parameter Selection

    Using the LDX-3232 in Constant Power (P) Mode Before using the LDX-3232 in Constant Power (P) Mode, the photodiode responsivity (CAL PD), which is used to convert between photodiode current and optical power of the laser diode, must be known.

  • Page 23: Automatic Laser Output Shut Off Conditions

    These conditions will automatically cause the instrument to disable the current source output:  LASER High Power Limit  LASER Interlock / Key Lock Turned Off  LASER Open Circuit or Voltage Limit November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 24 November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 25: Chapter 3 : Remote Operation

    Command Paths Reading the GPIB Address Before operating the LDX-3232 instrument from a remote location, its GPIB address must be known. Simply press the LOCAL button in the section labeled GPIB on the front panel. The instrument will display the address. The default address from the factory is address 01.

  • Page 26: Ldx-3232 Current Source Command Set

    Command Syntax Any command or command query must contain all of the letters that are shown in the LDX-3232 Command Path Structure, Figure 3.1. However, the Current Source's command parser is NOT case sensitive, so upper or lower case may be used in any combination. The lower case letters shown with the Device Dependent commands in Chapter 4 are optional letters and may be used for clarity.

  • Page 27: Table 3.1 Substitute Parameter Names

    Chapter 4). For more information, refer to the GPIB driver’s configuration manual. The command structure is illustrated in Figure 3.1. Table 4.1 lists all of the LDX-3232 High Compliance Current Source’s device-dependent commands, with the full path shown for each command and a brief explanation of its usage.

  • Page 28: Command Paths

    Command Paths The LDX-3232 High Compliance Current Source device-dependent commands are structured into a tree format (see Figure 3.1). Each of the legal paths is listed below, followed by its list of path options, each of that is followed by the commands themselves. It is recommended that the first-time user begin learning the commands by using the full path notation.

  • Page 29: Ieee488.2 Command Commands

    *SAV (1 to 10, see front panel SAVE function) *ESE (0 to 255, see Figure 3.3) *SRE (0 to 255, see Figure 3.3) *PUD (used at factory only) A list of all of the GPIB-IEEE488 Common Commands supported by the LDX-3232 follows: *CAL *OPC *SAV...

  • Page 30: Status Reporting

    LASER operations. The Event Registers are used to report events that occur during the operation of the LDX-3232 High Compliance Current Source. Events differ from conditions in that events signal an occurrence once, and are not reset until the Event Register is queried, the status cleared by the *CLS command, or the instrument is powered off.

  • Page 31: Operation Complete Definition

    This allows the use of the operation complete features of the LDX-3232, without the need for program looping or polling that can tie up the GPIB.

  • Page 32: Output Off Register

    Output Off Register The Output Off Enable Register allows determination of conditions and events in the LDX-3232 High Compliance Current Source can cause the current source output to be turned off. This reigster is configured in a manner similar to the status reporting registers. However, the register output is not reported in the Status Byte Register.

  • Page 33: Error Messages

    Parser Errors E-200 to E-299 Execution Control Errors E-300 to E-399 GPIB Errors E-500 to E-599 LASER Control Errors LDX-3232 Error Codes Table 3.3 Error Code Explanation E-001 Memory allocation failure E-103 <DEFINITE LENGTH ARBITRARY BLOCK PROGRAM DATA> length too long E-104 <NON-DECIMAL NUMERIC PROGRAM DATA>...
  • Page 34 Incorrect configuration for calibration sequence to start E-519 Setting a measurement is only valid during the calibration phase for that measurement; user has tried to calibrate a measurement without first entering the required calibration mode. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 35: Chapter 4 : Command Reference

    Chapter 4 : Command Reference This chapter is a guide to all the device dependent commands for the LDX-3232 High Compliance Current Source.  Overview of Remote Commands  List of Commands in Alphabetical Order Figure 4.1 shows the format for the device command descriptions in this chapter. The commands that emulate local (front panel) operation are denoted by the solid box next to the Local label in the upper left corner of the command description.
  • Page 36 LAS:MODE:MDP Sets the status of the laser output. LAS:OUT NONE Returns the status of the laser output. LAS:OUT? Sets the output current range. LAS:RAN NONE Returns the output current range. LAS:RAN? November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 37 Returns the default terminator to include a carriage return. TERM? NONE Returns the duration of time since the instrument was powered up. TIME? NONE Returns the duration of time since the last TIMER? query was issued. TIMER? November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 38: Ldx-3232 Device Dependent Command Reference

    LDX-3232 Device Dependent Command Reference The following pages contain a reference for the device-dependent commands of the LDX-3232 High Compliance Current Source. This reference contains useful information for both local and remote operation of the LDX-3232. In some reference, parentheses are used to signify the labeled are for a particular button or LED indicator on the front panel.
  • Page 39 Sets/returns photodiode feedback responsivity. Parameters An <nrf> value between 0 and 1000 in µA/mW. Notes If the parameter is set to 0, the LDX-3232 will operate in a constant IPD mode, when Constant P (MDP) mode is selected. Examples Write:...
  • Page 40 Description Enables or disables the display and some LEDS. Parameters A <bool value>; - where 1 = on, 0 = off. Examples Write: LAS:DIS 1 Action: Turns the LASER display on. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 41 The LDV measurement mode is turned off automatically when another display selection is enabled. Examples Write: LAS:DIS:LDV Action: Enables the display for LDV measurement. Query: LAS:DIS:LDV? Response: LDV measurement is displayed. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 42 The set point display will not time out when REMOTE operation is used. (It will be continuously displayed.) Examples Query: LAS:DISPLAY:SET? Response: The set point is not shown on the display. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 43 32768 Examples Write: LAS:ENAB:EVENT 136 Action: Enables the open circuit and power limit events to be reported. Query: LAS:ENAB:EVE? Response: 1040 Output on/off state and interlock state changed events were reported. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 44 16 Interlock disabled 4096 N/A 32 N/A 8192 N/A 64 Compliance Voltage Limit 16384 N/A 128 Open Circuit 32768 N/A Examples Query: LAS:EVE? Response: Output tolerance changed and current limit events have occurred. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 45 EMOTE Description Returns the value of the measured voltage. Parameters None. Notes This measurement is updated approximately once every 600ms. Examples Query: LAS:LDV? Response: 3.03 Measured output voltage is 3.03 V. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 46 (default) or generate a warning. Examples Write: LAS:LIM:MDP 10 Action: Monitor photodiode power limit is set to 10mW. Query: LAS:LIM:MDP? Response: Monitor photodiode power limit is set to 5mW. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 47 Examples Write: LAS:MDLN 1 Action: Turns the modulation input on and enables modulation via the front panel BNC connector. Query: LAS:MDLN? Response Modulation input is disabled. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 48 Description Sets/returns the status of the laser output. Parameters A <bool value>; 1=on, 0=off. Examples Write: LAS:OUT ON Action: Turns on the laser output. Query: LAS:OUT? Response: Laser output is off. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...
  • Page 49 The Laser Drive Current output should be “off” when this command is issued. If the Laser Diode Current output is “on” when this command is issued, the LDX-3232 will generate error E515, and the range will not be changed.
  • Page 50 Notes Operation complete flag will bet set when the conditions are met. The LDX-3232 defaults to a tolerance of 1.0 mA for three seconds, unless changed by the LASer:TOLerance command. If the LDX-3232 is operated in P mode, the current tolerance parameter is not used.
  • Page 51 LDX-3232 out of GPIB/IEEE488 specification, but may be done for convenience when using nonstandard GPIB controllers. This termination will be sent with all output until the TERM 0 command is sent or the LDX-3232 is powered off. Examples...
  • Page 52 Each time the TIMER? query is issued, the timer is reset to 0 and the elapsed time since the last TIMER? query is returned. Examples Query: TIMER? Response: 00:02:00.31 Two minutes and 0.31 seconds have elapsed since the last TIMER? query was issued. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 53: Chapter 5 : Functions And Features

    For applications where alternation between particular instrument configurations is needed, the LDX-3232 Current Source offers a SAVE and RECALL feature. The SAVE feature allows easy storage of all front panel settings for any given instrument configuration. These settings, that are stored in one of ten memory bins, can be retrieved at any time with the RECALL function.

  • Page 54: Saving And Recalling Under Remote Operation

    The TTL pulse is initiated with any remote change in set point of the laser current source. The trigger output is available via a standard BNC connector on the rear panel of the LDX-3232 Current Source. See Figure 1.2. The TTL pulse is approximately 13µs wide and has a delay time of about 10-12ms after the current set point is changed via GPIB.

  • Page 55: Using The Ldx-3232'S Bnc Interlock Connection

    BNC interlock can be used to accept an error signal from the laser diode temperature controller unit. Linking the LDX-3232 Current Source to a temperature controller* with the ability to signal when its temperature control has gone outside of some tolerance window will allow the LDX- 3232 to safely shutoff its output before thermal damage occurs to the laser diode.

  • Page 56: Modulating The Laser Current Source

    4. Turn on the LDX-3232 output. 5. Turn on the modulation source output. a. If the modulation source output is turned on before the LDX-3232 output, it can trigger limit errors Notes: The limit clamp function for DC output current also applies to the modulated current, protecting the laser in any mode.

  • Page 57: Chapter 6 : Calibration And Troubleshooting

    Source may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 to 40°C. Finally, the LDX-3232 Current Source should be allowed to warm up for at least one hour before beginning calibration.

  • Page 58: Recommended Equipment

    Recommended Equipment Recommended test equipment for calibrating the LDX-3232 Current Source is listed in Table 6.1. Equipment other than that shown in the table may be used if the specifications meet or exceed those listed. Recommended Test Equipment Table 6.1...

  • Page 59: Calibration Of The Ldx-3232 Current Source

    However, the *OPC, *WAI commands, or *OPC? query should not be issued until after the expected calibration value is entered, or the system will hang. This happens because the LDX-3232 Current Source will wait indefinitely for an input, yet not allow any input until the calibration is finished.
  • Page 60 LED is lit. ii. Remote: Write the LAS:MODE:IHBW command. k. Repeat the calibration procedure as described above. Change the output range to high range and repeat the calibration procedure as described above. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 61: Ipd

    Wait for the value on the display to stabilize (has not changed by more than one digit for several seconds). When this has occurred, the LDX-3232 Current Source is ready for the actual I value to be entered.
  • Page 62 Local: Releasing the (PARAMETER) SET button to store the second calibration value. ii. Remote: Writing the LAS:MDI <nrf> command to store the second calibration value. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13 Rev. 01...

  • Page 63: Laser Forward Voltage Measurement Calibration

    Releasing the (PARAMETER) SET button to store the second calibration value. ii. Remote: Writing the LAS:LDV <nrf> command to store the second calibration value. This ends the section on calibration of the LDX-3232 Current Source. November 2017 70037802 LDX-3232 Manual 09-FM030 1/30/13...

  • Page 64: Troubleshooting Guide

    Troubleshooting Guide This section is a guide to troubleshooting the LDX-3232 Current Sources. More common symptoms are listed here, and appropriate troubleshooting actions are given. The user is recommended to start at the beginning of this guide. Read the symptom descriptions, and follow the steps for the corrective actions that apply.

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