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Lightwave Communications manual Applying Power to Your LDX-3232, Power On Sequence

Models: LDX-3232

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O P E R A T I O N

Applying Power to Your LDX-3232

C H A P T E R 2

C H A P T E R 2

OPERATION

This chapter introduces you to the operation of the LDX-3232 High Compliance Current Source. It offers instructions for connecting your laser to the current source and describes powering up the instrument. This chapter also contains step by step procedures that teach you how to operate your current source in Constant Current Mode and Constant Power Mode. We recommend that you review the contents of this chapter at a minimum before operating the LDX-3232 Current Source.

Applying Power to Your LDX-3232

To turn on the LDX-3232, rotate the key in the "POWER" section of the front panel from "O" to "I". This action will initiate the power on sequence. If the LDX-3232 does not appear to turn on, verify that it is connected to line power. If line power is not the problem, remove the power cord and check the voltage selection block in addition to the line power fuse.

The Power On Sequence

During the power-up sequence, the following takes place. For about three seconds all indicators light up, and all of the 7-segment displays indicate "8". Then all lamps are turned off for three seconds. Next, the firmware version will be displayed. Then, a self-test is performed to ensure that the instrument's hardware and processor are communicating. After this test, the instrument is ready to operate and is configured to the state it was in when the power was last shut off.

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LDX-3232

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Lightwave Communications manual Applying Power to Your LDX-3232, Power On Sequence

Contents

User’s Guide Page Table of Contents Remote Operation Command Reference Iv LDX-3232 List of Figures Vi LDX-3232 List of Tables Viii LDX-3232 General Safety Considerations Safety Information and the Manual Safety Marking Symbols Safety Symbols Warranty Claims for Shipping Damage Description of the problem Comments, Suggestions, and ProblemsModel Number Serial Number End-User Name Company Phone Fax Xiv LDX-3232 Product Overview Introduction and Specifications AC Line Power Requirements Installing Your LDX-3232 High Compliance Current SourceInitial Inspection Grounding Requirements Tilt-Foot Adjustment Gpib ConnectorGpib Address Operating the LDX-3232 Precision Current Source LDX-3232 Front View Maintenance Specifications TTL Type Pulse Width Delay13 µs 12 ms Description Model Number Available Options and Accessories Power On Sequence Applying Power to Your LDX-3232 Power On State Connecting to the Laser Common Laser Cathode Photodiode Anode Interlock Connections Back Panel LD Connector Photodiode Connections Setting the PD BiasGrounding Considerations Front Panel Operation Operating a Laser in Constant Current I ModeDisplay Setting Up the Precision Current Source E R a T I O N Entering Photodiode Responsivity Values Operating a Laser in Constant Power P Mode Method to calculate the responsivity is suggested below LDX-3232 Error Indicators Error Indicators Error Indicators LDX-3232 Changing the Gpib Address Reading the Gpib Address Command Syntax LDX-3232 Current Source Command SetChanging Operation from Local to Remote OFF OLD NEW True False SET Reset LASLDI? LDX-3232 Command Path Structure Command Paths IEEE488.2 Command Commands None LDX-3232 Frequently Used CommandsLIM Event and Condition Registers Status ReportingOperation Complete Definition LDX-3232 Status Reporting Schematic Diagram Output Off Register Disabled 10 N/A Enabled 11 N/A 12 N/A 13 N/A 14 N/A 15 N/A LASerENABleOUTOFF nrf LASerENABleOUTOFF? Error Messages Command Timing and Completion Response Message Error Code Classifications Mode Commands Used to create a delay in the execution of furtherUsed to enter the laser current calibration mode Used to enter the laser voltage calibration mode Enables Laser display to show parameter values Returns status of photodiode monitor power displaySets the enable register for Laser conditions Returns the value of the LAS conditions enable register Used to set the constant optical power setpoint, if Used to return the optical power from monitorUsed to enable/disable the front panel modulation input Or P optical power Powered up Returns the status of the Term commandReturns the elapsed time since the timer was last reset Used to return the Laser setpoint tolerance value Command Description Format LDX-3232 Device-Dependent Commands Delay LDX-3232 Device-Dependent Command Reference LASerCALMD ERRors?Calmd LAS Calpd LASerCALMD? Responsivity CAL PD parameter setting Syntax Diagram LASerCALLDI Selected. This procedure is outlined in ChapterCalibration for that bandwidth LASerCALLDV LASerCALLDI?LDI LAS CAL LAS CAL LDV LASerCALLDV? True measured value. This procedure is outlined in ChapterLASerCALMDI LASerCOND? LASerCALMDI?MDI LAS CAL IPD LASerDEC LASerDISplay? LASerDISplayLAS DIS LASDIS? LASerDISplayLDI? LASerDISplayLDILasdisldi LDI LASerDISplayLDV Voltage measurement Syntax DiagramLASerDISplayLDV? LASDISLDV? LASerDISplayMDI? LASerDISplayMDILAS DIS MDI LAS DIS IPD LASerDISplayMDP? LASerDISplayMDPPPD LAS DIS MDP LASerDISplaySET LASerDISplayPARAMLAS DIS Param LAS DIS SET LASerDISplaySET? LASerENABleCONDLASDISPLAYSET? Bit LASerENABleCOND?LAS Enab Cond An nrf value whose sum represents the bits that are enabled LASerENABleEVEntAction enables the Laser status event register so that Lasenabevent LAS Enab EVE LASerENABleEVEnt? LASerENABleOUTOFF LAS Enab Outoff LASerENABleOUTOFF? Command while the condition status is constantly changing LASerENABleEVEnt commandLASerEVEnt? LAS EVE Function for the Laser output LASerINC LASerLDI This measurement is updated approximately once every 600 msLASerLDI? LAS LDI LASerLDV? LASerLDVFor LDV calibration LAS LDV LASerLIMitI2? LASerLIMitI2Limit in use depends on the Laser output range selection LAS LIM LASerLIMitI4 Displayed, and then releasing the SET switchLASerLIMitI4? LASLIMI4? LASerLIMitMDP? LASerLIMitMDPMDP LAS LIM LASerLIMitV? LASerLIMitV LASerMDI? LASerMDIMDI LAS IPD MDP P PD setpoint would be used LASerMDLN? LASerMDLNLAS Mdln LASerMDP? LASerMDPMDP LAS LAS Mode Ihbw LAS ModeLASerMODE? LASerMODEIHBW LASerMODEILBW LAS Mode MDPLASerMODEMDP Lasmodeilbw LASerOUTput? LASerOUTputLAS OUT LASerRANge? LASerRANgeLAS RAN LASRAN? 30 µA, for use in constant P mode with Calpd = Where the response is the constant I setpoint value, in mALASerSETLDI? LASerSETMDI? LASerSETMDP? Where the response is the constand PPD setpoint, in mWLASerSTEP 100 µA LASerSTEP? LASerTOLerance commandLASerTOLerance LAS TOL MESsage LASerTOLerance?Second is the time window, in seconds MES RADix MESsage? RADix? Term 0 command is sent or the LDX-3232 is powered offRAD Means hexadecimal, and OCT means octal Time clock is independent of the Timer clock LDX-3232 was last powered upTime Timer Since the last TIMER? query was issuedLast TIMER? query is returned Seconds since the last TIMER? query was issued Saving and Recalling from the Front Panel Functions and Features Saving and Recalling Under Remote Operation Using the Laser Compliance Voltage Adjustment LDX-3232 Rear Panel Using the LDX-3232 Current Source’s Trigger Function BNC Interlock Usage Example Modulating the Laser Current Source Modulating the Laser Current Source Functions and Features Calibration Overview Calibration and Troubleshooting Recommended Equipment Description Manufacturer/Model SpecificationDMM Current Source Calibration Local Calibration of the LDX-3232 Current SourceRange Current Limit IPD Current Calibration CAL PD Constant powerSet equal to zero IPD Setpoint Laser Forward Voltage Measurement Calibration Laser Mode2000 mA Set to FS full scale of range Remote Calibration of the LDX-3232 Current Source Gpib CommandLimit Lasldi nrf value command IPD Setpoint Function State Gpib Command General Troubleshooting GuideEEPROM, Lllll will be displayed on the display the laser Current source must be recalibrated Command Feature can be defeated via the Lasenableoutoff 101 Response Message