Error Indicators | Lightwave Communications LDX-3232 manual

O P E R A T I O N

Error Indicators

C H A P T E R 2

Now the instrument is configured to operate in Constant Power Mode. In the MODE section, enable the output of the laser current source by depressing the OUTPUT push button once. The accompanying LED labeled ON will illuminate indicating that the laser output is on and current is being driven to the laser. The LDX-3232 current source will drive the laser to the Constant Power setpoint and maintain closed loop control with the photodiode current measurement.

Error Indicators

The LDX-3232 High Compliance Current Sources indicate general operational error conditions. Each error condition results in an action as shown in the table below.

Table 2.2 LDX-3232 Error Indicators

Error Condition	Action
Interlock	Output off; INTERLOCK light flashes at 1 Hz

Open Circuit	Output off; OPEN CIRCUIT light flashes at 1 Hz; if this condition was caused by
	an excessively high compliance voltage, the VOLTAGE LIMIT light will also be
	turned on.
Current Limit	CURRENT LIMIT light flashes at 1 Hz

Voltage Limit	VOLTAGE LIMIT light flashes at 1 Hz; this indicator warns that the output is within
	0.25 V of LIM V setting; if the voltage limit (LIM V) is reached, the LASER output
	will shut off.
Optical Output	Output off; POWER LIMIT light flashes at 1 Hz
Power Limit

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LDX-3232

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Lightwave Communications manual LDX-3232 Error Indicators

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 Model Number Serial Number End-User Name Company Phone Fax Comments, Suggestions, and ProblemsDescription of the problem Xiv LDX-3232 Product Overview Introduction and Specifications Grounding Requirements Installing Your LDX-3232 High Compliance Current SourceAC Line Power Requirements Initial Inspection Operating the LDX-3232 Precision Current Source Gpib ConnectorTilt-Foot Adjustment Gpib Address LDX-3232 Front View Maintenance Specifications 13 µs 12 ms Type Pulse Width DelayTTL 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 Grounding Considerations Setting the PD BiasPhotodiode Connections Display Operating a Laser in Constant Current I ModeFront Panel Operation 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 Changing Operation from Local to Remote LDX-3232 Current Source Command SetCommand Syntax OFF OLD NEW True False SET Reset LASLDI? LDX-3232 Command Path Structure Command Paths IEEE488.2 Command Commands LIM LDX-3232 Frequently Used CommandsNone Operation Complete Definition Status ReportingEvent and Condition Registers 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 Used to enter the laser voltage calibration mode Used to create a delay in the execution of furtherCommands Used to enter the laser current calibration mode Returns the value of the LAS conditions enable register Returns status of photodiode monitor power displayEnables Laser display to show parameter values Sets the enable register for Laser conditions Or P optical power Used to return the optical power from monitorUsed to set the constant optical power setpoint, if Used to enable/disable the front panel modulation input Used to return the Laser setpoint tolerance value Returns the status of the Term commandPowered up Returns the elapsed time since the timer was last reset Command Description Format LDX-3232 Device-Dependent Commands Delay LDX-3232 Device-Dependent Command Reference Calmd LAS Calpd ERRors?LASerCALMD LASerCALMD? Responsivity CAL PD parameter setting Syntax Diagram Calibration for that bandwidth Selected. This procedure is outlined in ChapterLASerCALLDI LAS CAL LDV LASerCALLDI?LASerCALLDV LDI LAS CAL LASerCALMDI True measured value. This procedure is outlined in ChapterLASerCALLDV? LAS CAL IPD LASerCALMDI?LASerCOND? MDI LASerDEC LASDIS? LASerDISplayLASerDISplay? LAS DIS LDI LASerDISplayLDILASerDISplayLDI? Lasdisldi LASDISLDV? Voltage measurement Syntax DiagramLASerDISplayLDV LASerDISplayLDV? LAS DIS IPD LASerDISplayMDILASerDISplayMDI? LAS DIS MDI LAS DIS MDP LASerDISplayMDPLASerDISplayMDP? PPD LAS DIS SET LASerDISplayPARAMLASerDISplaySET LAS DIS Param LASDISPLAYSET? LASerENABleCONDLASerDISplaySET? LAS Enab Cond LASerENABleCOND?Bit Lasenabevent LASerENABleEVEntAn nrf value whose sum represents the bits that are enabled Action enables the Laser status event register so that LAS Enab EVE LASerENABleEVEnt? LASerENABleOUTOFF LAS Enab Outoff LASerENABleOUTOFF? LAS EVE LASerENABleEVEnt commandCommand while the condition status is constantly changing LASerEVEnt? Function for the Laser output LASerINC LAS LDI This measurement is updated approximately once every 600 msLASerLDI LASerLDI? LAS LDV LASerLDVLASerLDV? For LDV calibration LAS LIM LASerLIMitI2LASerLIMitI2? Limit in use depends on the Laser output range selection LASLIMI4? Displayed, and then releasing the SET switchLASerLIMitI4 LASerLIMitI4? MDP LAS LIM LASerLIMitMDPLASerLIMitMDP? LASerLIMitV? LASerLIMitV MDP P PD setpoint would be used LASerMDILASerMDI? MDI LAS IPD LAS Mdln LASerMDLNLASerMDLN? MDP LAS LASerMDPLASerMDP? LASerMODEIHBW LAS ModeLAS Mode Ihbw LASerMODE? Lasmodeilbw LAS Mode MDPLASerMODEILBW LASerMODEMDP LAS OUT LASerOUTputLASerOUTput? LASRAN? LASerRANgeLASerRANge? LAS RAN LASerSETMDI? Where the response is the constant I setpoint value, in mA30 µA, for use in constant P mode with Calpd = LASerSETLDI? 100 µA Where the response is the constand PPD setpoint, in mWLASerSETMDP? LASerSTEP LAS TOL LASerTOLerance commandLASerSTEP? LASerTOLerance MES LASerTOLerance?MESsage Second is the time window, in seconds RADix MESsage? Means hexadecimal, and OCT means octal Term 0 command is sent or the LDX-3232 is powered offRADix? RAD Time LDX-3232 was last powered upTime clock is independent of the Timer clock Seconds since the last TIMER? query was issued Since the last TIMER? query was issuedTimer Last TIMER? query is returned 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 DMM Description Manufacturer/Model SpecificationRecommended Equipment Current Limit Local Calibration of the LDX-3232 Current SourceCurrent Source Calibration Range IPD Current Calibration IPD Setpoint Constant powerCAL PD Set equal to zero Set to FS full scale of range Laser ModeLaser Forward Voltage Measurement Calibration 2000 mA Limit Gpib CommandRemote Calibration of the LDX-3232 Current Source Lasldi nrf value command IPD Setpoint Function State Gpib Command Current source must be recalibrated Troubleshooting GuideGeneral EEPROM, Lllll will be displayed on the display the laser Command Feature can be defeated via the Lasenableoutoff 101 Response Message