Lightwave Communications manual LDX-3232 Error Indicators

Page 35

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

 

04_06

LDX-3232

19

Page 34 Page 36
Image 35
Page 34 Page 36
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 ManualSafety Marking Symbols Safety SymbolsWarranty 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 SpecificationsGrounding Requirements Installing Your LDX-3232 High Compliance Current SourceAC Line Power Requirements Initial InspectionOperating the LDX-3232 Precision Current Source Gpib ConnectorTilt-Foot Adjustment Gpib AddressLDX-3232 Front View Maintenance Specifications 13 µs 12 ms Type Pulse Width DelayTTL Description Model Number Available Options and AccessoriesPower On Sequence Applying Power to Your LDX-3232Power On State Connecting to the LaserCommon Laser Cathode Photodiode Anode Interlock Connections Back Panel LD ConnectorGrounding 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 ModeMethod to calculate the responsivity is suggested below LDX-3232 Error Indicators Error IndicatorsError Indicators LDX-3232 Changing the Gpib Address Reading the Gpib AddressChanging 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 PathsIEEE488.2 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/ALASerENABleOUTOFF nrf LASerENABleOUTOFF? Error Messages Command Timing and CompletionResponse Message Error Code ClassificationsMode 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 modeReturns 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 conditionsOr 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 inputUsed to return the Laser setpoint tolerance value Returns the status of the Term commandPowered up Returns the elapsed time since the timer was last resetCommand Description Format LDX-3232 Device-Dependent CommandsDelay LDX-3232 Device-Dependent Command ReferenceCalmd LAS Calpd ERRors?LASerCALMD LASerCALMD? Responsivity CAL PD parameter setting Syntax DiagramCalibration for that bandwidth Selected. This procedure is outlined in ChapterLASerCALLDI LAS CAL LDV LASerCALLDI?LASerCALLDV LDI LAS CALLASerCALMDI True measured value. This procedure is outlined in ChapterLASerCALLDV? LAS CAL IPD LASerCALMDI?LASerCOND? MDILASerDEC LASDIS? LASerDISplayLASerDISplay? LAS DISLDI LASerDISplayLDILASerDISplayLDI? LasdisldiLASDISLDV? Voltage measurement Syntax DiagramLASerDISplayLDV LASerDISplayLDV?LAS DIS IPD LASerDISplayMDILASerDISplayMDI? LAS DIS MDILAS DIS MDP LASerDISplayMDPLASerDISplayMDP? PPDLAS DIS SET LASerDISplayPARAMLASerDISplaySET LAS DIS ParamLASDISPLAYSET? 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 thatLAS 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 LASerINCLAS LDI This measurement is updated approximately once every 600 msLASerLDI LASerLDI?LAS LDV LASerLDVLASerLDV? For LDV calibrationLAS LIM LASerLIMitI2LASerLIMitI2? Limit in use depends on the Laser output range selectionLASLIMI4? Displayed, and then releasing the SET switchLASerLIMitI4 LASerLIMitI4?MDP LAS LIM LASerLIMitMDPLASerLIMitMDP? LASerLIMitV? LASerLIMitVMDP P PD setpoint would be used LASerMDILASerMDI? MDI LAS IPDLAS Mdln LASerMDLNLASerMDLN? MDP LAS LASerMDPLASerMDP? LASerMODEIHBW LAS ModeLAS Mode Ihbw LASerMODE?Lasmodeilbw LAS Mode MDPLASerMODEILBW LASerMODEMDPLAS OUT LASerOUTputLASerOUTput? LASRAN? LASerRANgeLASerRANge? LAS RANLASerSETMDI? 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? LASerSTEPLAS TOL LASerTOLerance commandLASerSTEP? LASerTOLeranceMES LASerTOLerance?MESsage Second is the time window, in secondsRADix MESsage?Means hexadecimal, and OCT means octal Term 0 command is sent or the LDX-3232 is powered offRADix? RADTime 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 returnedSaving and Recalling from the Front Panel Functions and FeaturesSaving and Recalling Under Remote Operation Using the Laser Compliance Voltage AdjustmentLDX-3232 Rear Panel Using the LDX-3232 Current Source’s Trigger FunctionBNC Interlock Usage Example Modulating the Laser Current SourceModulating the Laser Current Source Functions and Features Calibration Overview Calibration and TroubleshootingDMM Description Manufacturer/Model SpecificationRecommended Equipment Current Limit Local Calibration of the LDX-3232 Current SourceCurrent Source Calibration RangeIPD Current Calibration IPD Setpoint Constant powerCAL PD Set equal to zeroSet to FS full scale of range Laser ModeLaser Forward Voltage Measurement Calibration 2000 mALimit 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 laserCommand Feature can be defeated via the Lasenableoutoff101 Response Message
Top Page Image Contents