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
 Safety Information and the Manual
General Safety Considerations
 Safety Symbols
Safety Marking Symbols
 Warranty
 Claims for Shipping Damage
 Model Number Serial Number End-User Name Company Phone Fax
Comments, Suggestions, and Problems
Description of the problem
 Xiv LDX-3232
 Introduction and Specifications
Product Overview
 Installing Your LDX-3232 High Compliance Current Source
AC Line Power Requirements
Initial Inspection
Grounding Requirements
 Gpib Connector
Tilt-Foot Adjustment
Gpib Address
Operating the LDX-3232 Precision Current Source
 LDX-3232 Front View
 Maintenance
 Specifications
 13 µs 12 ms
Type Pulse Width Delay
TTL
 Available Options and Accessories
Description Model Number
 Applying Power to Your LDX-3232
Power On Sequence
 Connecting to the Laser
Power On State
 Common Laser Cathode Photodiode Anode
 Back Panel LD Connector
Interlock Connections
 Grounding Considerations
Setting the PD Bias
Photodiode Connections
 Display
Operating a Laser in Constant Current I Mode
Front Panel Operation
 Setting Up the Precision Current Source
 E R a T I O N
 Operating a Laser in Constant Power P Mode
Entering Photodiode Responsivity Values
 Method to calculate the responsivity is suggested below
 Error Indicators
LDX-3232 Error Indicators
 Error Indicators LDX-3232
 Reading the Gpib Address
Changing the Gpib Address
 Changing Operation from Local to Remote
LDX-3232 Current Source Command Set
Command Syntax
 OFF OLD NEW True False SET Reset
 LASLDI?
 Command Paths
LDX-3232 Command Path Structure
 IEEE488.2 Command Commands
 LIM
LDX-3232 Frequently Used Commands
None
 Operation Complete Definition
Status Reporting
Event and Condition Registers
 LDX-3232 Status Reporting Schematic Diagram
 Disabled 10 N/A Enabled 11 N/A 12 N/A 13 N/A 14 N/A 15 N/A
Output Off Register
 LASerENABleOUTOFF nrf LASerENABleOUTOFF?
 Command Timing and Completion
Error Messages
 Error Code Classifications
Response Message
 Mode
 Used to create a delay in the execution of further
Commands
Used to enter the laser current calibration mode
Used to enter the laser voltage calibration mode
 Returns status of photodiode monitor power display
Enables Laser display to show parameter values
Sets the enable register for Laser conditions
Returns the value of the LAS conditions enable register
 Used to return the optical power from monitor
Used to set the constant optical power setpoint, if
Used to enable/disable the front panel modulation input
Or P optical power
 Returns the status of the Term command
Powered up
Returns the elapsed time since the timer was last reset
Used to return the Laser setpoint tolerance value
 LDX-3232 Device-Dependent Commands
Command Description Format
 LDX-3232 Device-Dependent Command Reference
Delay
 Calmd LAS Calpd
ERRors?
LASerCALMD
 Responsivity CAL PD parameter setting Syntax Diagram
LASerCALMD?
 Calibration for that bandwidth
Selected. This procedure is outlined in Chapter
LASerCALLDI
 LASerCALLDI?
LASerCALLDV
LDI LAS CAL
LAS CAL LDV
 LASerCALMDI
True measured value. This procedure is outlined in Chapter
LASerCALLDV?
 LASerCALMDI?
LASerCOND?
MDI
LAS CAL IPD
 LASerDEC
 LASerDISplay
LASerDISplay?
LAS DIS
LASDIS?
 LASerDISplayLDI
LASerDISplayLDI?
Lasdisldi
LDI
 Voltage measurement Syntax Diagram
LASerDISplayLDV
LASerDISplayLDV?
LASDISLDV?
 LASerDISplayMDI
LASerDISplayMDI?
LAS DIS MDI
LAS DIS IPD
 LASerDISplayMDP
LASerDISplayMDP?
PPD
LAS DIS MDP
 LASerDISplayPARAM
LASerDISplaySET
LAS DIS Param
LAS DIS SET
 LASDISPLAYSET?
LASerENABleCOND
LASerDISplaySET?
 LAS Enab Cond
LASerENABleCOND?
Bit
 LASerENABleEVEnt
An nrf value whose sum represents the bits that are enabled
Action enables the Laser status event register so that
Lasenabevent
 LASerENABleEVEnt?
LAS Enab EVE
 LASerENABleOUTOFF
 LASerENABleOUTOFF?
LAS Enab Outoff
 LASerENABleEVEnt command
Command while the condition status is constantly changing
LASerEVEnt?
LAS EVE
 LASerINC
Function for the Laser output
 This measurement is updated approximately once every 600 ms
LASerLDI
LASerLDI?
LAS LDI
 LASerLDV
LASerLDV?
For LDV calibration
LAS LDV
 LASerLIMitI2
LASerLIMitI2?
Limit in use depends on the Laser output range selection
LAS LIM
 Displayed, and then releasing the SET switch
LASerLIMitI4
LASerLIMitI4?
LASLIMI4?
 MDP LAS LIM
LASerLIMitMDP
LASerLIMitMDP?
 LASerLIMitV
LASerLIMitV?
 LASerMDI
LASerMDI?
MDI LAS IPD
MDP P PD setpoint would be used
 LAS Mdln
LASerMDLN
LASerMDLN?
 MDP LAS
LASerMDP
LASerMDP?
 LAS Mode
LAS Mode Ihbw
LASerMODE?
LASerMODEIHBW
 LAS Mode MDP
LASerMODEILBW
LASerMODEMDP
Lasmodeilbw
 LAS OUT
LASerOUTput
LASerOUTput?
 LASerRANge
LASerRANge?
LAS RAN
LASRAN?
 Where the response is the constant I setpoint value, in mA
30 µA, for use in constant P mode with Calpd =
LASerSETLDI?
LASerSETMDI?
 Where the response is the constand PPD setpoint, in mW
LASerSETMDP?
LASerSTEP
100 µA
 LASerTOLerance command
LASerSTEP?
LASerTOLerance
LAS TOL
 LASerTOLerance?
MESsage
Second is the time window, in seconds
MES
 MESsage?
RADix
 Term 0 command is sent or the LDX-3232 is powered off
RADix?
RAD
Means hexadecimal, and OCT means octal
 Time
LDX-3232 was last powered up
Time clock is independent of the Timer clock
 Since the last TIMER? query was issued
Timer
Last TIMER? query is returned
Seconds since the last TIMER? query was issued
 Functions and Features
Saving and Recalling from the Front Panel
 Using the Laser Compliance Voltage Adjustment
Saving and Recalling Under Remote Operation
 Using the LDX-3232 Current Source’s Trigger Function
LDX-3232 Rear Panel
 Modulating the Laser Current Source
BNC Interlock Usage Example
 Modulating the Laser Current Source
 Functions and Features
 Calibration and Troubleshooting
Calibration Overview
 DMM
Description Manufacturer/Model Specification
Recommended Equipment
 Local Calibration of the LDX-3232 Current Source
Current Source Calibration
Range
Current Limit
 IPD Current Calibration
 Constant power
CAL PD
Set equal to zero
IPD Setpoint
 Laser Mode
Laser Forward Voltage Measurement Calibration
2000 mA
Set to FS full scale of range
 Limit
Gpib Command
Remote Calibration of the LDX-3232 Current Source
 Lasldi nrf value command
 IPD Setpoint
 Function State Gpib Command
 Troubleshooting Guide
General
EEPROM, Lllll will be displayed on the display the laser
Current source must be recalibrated
 Feature can be defeated via the Lasenableoutoff
Command
 101
 Response Message