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 Problems
Model Number Serial Number End-User Name Company Phone Fax
Xiv LDX-3232
Product Overview
Introduction and Specifications
Grounding Requirements
Installing Your LDX-3232 High Compliance Current Source
AC Line Power Requirements
Initial Inspection
Operating the LDX-3232 Precision Current Source
Gpib Connector
Tilt-Foot Adjustment
Gpib Address
LDX-3232 Front View
Maintenance
Specifications
TTL
Type Pulse Width Delay
13 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 Bias
Grounding Considerations
Front Panel Operation
Operating a Laser in Constant Current I Mode
Display
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 Set
Changing 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 Commands
LIM
Event and Condition Registers
Status Reporting
Operation 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
Used to enter the laser voltage calibration mode
Used to create a delay in the execution of further
Commands
Used to enter the laser current calibration mode
Returns the value of the LAS conditions enable register
Returns status of photodiode monitor power display
Enables Laser display to show parameter values
Sets the enable register for Laser conditions
Or P optical power
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
Used to return the Laser setpoint tolerance value
Returns the status of the Term command
Powered 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
LASerCALMD
ERRors?
Calmd LAS Calpd
LASerCALMD?
Responsivity CAL PD parameter setting Syntax Diagram
LASerCALLDI
Selected. This procedure is outlined in Chapter
Calibration for that bandwidth
LAS CAL LDV
LASerCALLDI?
LASerCALLDV
LDI LAS CAL
LASerCALLDV?
True measured value. This procedure is outlined in Chapter
LASerCALMDI
LAS CAL IPD
LASerCALMDI?
LASerCOND?
MDI
LASerDEC
LASDIS?
LASerDISplay
LASerDISplay?
LAS DIS
LDI
LASerDISplayLDI
LASerDISplayLDI?
Lasdisldi
LASDISLDV?
Voltage measurement Syntax Diagram
LASerDISplayLDV
LASerDISplayLDV?
LAS DIS IPD
LASerDISplayMDI
LASerDISplayMDI?
LAS DIS MDI
LAS DIS MDP
LASerDISplayMDP
LASerDISplayMDP?
PPD
LAS DIS SET
LASerDISplayPARAM
LASerDISplaySET
LAS DIS Param
LASerDISplaySET?
LASerENABleCOND
LASDISPLAYSET?
Bit
LASerENABleCOND?
LAS Enab Cond
Lasenabevent
LASerENABleEVEnt
An 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 command
Command while the condition status is constantly changing
LASerEVEnt?
Function for the Laser output
LASerINC
LAS LDI
This measurement is updated approximately once every 600 ms
LASerLDI
LASerLDI?
LAS LDV
LASerLDV
LASerLDV?
For LDV calibration
LAS LIM
LASerLIMitI2
LASerLIMitI2?
Limit in use depends on the Laser output range selection
LASLIMI4?
Displayed, and then releasing the SET switch
LASerLIMitI4
LASerLIMitI4?
LASerLIMitMDP?
LASerLIMitMDP
MDP LAS LIM
LASerLIMitV?
LASerLIMitV
MDP P PD setpoint would be used
LASerMDI
LASerMDI?
MDI LAS IPD
LASerMDLN?
LASerMDLN
LAS Mdln
LASerMDP?
LASerMDP
MDP LAS
LASerMODEIHBW
LAS Mode
LAS Mode Ihbw
LASerMODE?
Lasmodeilbw
LAS Mode MDP
LASerMODEILBW
LASerMODEMDP
LASerOUTput?
LASerOUTput
LAS OUT
LASRAN?
LASerRANge
LASerRANge?
LAS RAN
LASerSETMDI?
Where the response is the constant I setpoint value, in mA
30 µA, for use in constant P mode with Calpd =
LASerSETLDI?
100 µA
Where the response is the constand PPD setpoint, in mW
LASerSETMDP?
LASerSTEP
LAS TOL
LASerTOLerance command
LASerSTEP?
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 off
RADix?
RAD
Time clock is independent of the Timer clock
LDX-3232 was last powered up
Time
Seconds since the last TIMER? query was issued
Since the last TIMER? query was issued
Timer
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
Recommended Equipment
Description Manufacturer/Model Specification
DMM
Current Limit
Local Calibration of the LDX-3232 Current Source
Current Source Calibration
Range
IPD Current Calibration
IPD Setpoint
Constant power
CAL PD
Set equal to zero
Set to FS full scale of range
Laser Mode
Laser Forward Voltage Measurement Calibration
2000 mA
Remote Calibration of the LDX-3232 Current Source
Gpib Command
Limit
Lasldi nrf value command
IPD Setpoint
Function State Gpib Command
Current source must be recalibrated
Troubleshooting Guide
General
EEPROM, Lllll will be displayed on the display the laser
Command
Feature can be defeated via the Lasenableoutoff
101
Response Message