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Lightwave LDX-3232 manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    User’ s Guide LDX-3232 High Compliance Current Source 70037800_R01_04_06 ILX Lightwa ve Corporation · P . O . Box 6310 · Boz eman, MT , U .S.A. 59771 · U .S. & Canada: 1-800-459-9459 · International Inquir ies : 406-556-2481 · F ax 406-586-9405 ilx.custhelp.com · www .ilxlightwave.com[...]

  • Page 2

    [...]

  • Page 3

    T ABLE OF CONTENTS 04_06 LDX -3232 i                    T ABLE OF C ONTENTS Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix General Safety Considerat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix Safety M[...]

  • Page 4

    T ABLE OF CONTENTS ii LDX -3232  Connecting to the Laser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Interlock Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Photodiode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 5

    T ABLE OF CONTENTS 04_06 LDX -3232 iii  Chapter 4 Command Reference LDX-3232 Device-Dep endent Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 LDX-3232 Device-Dep endent Command Reference . . . . . . . . . . . . . . . . . . . . 40 Chapter 5 Functions and Features Saving and Recalling from the Front Panel . . . . . . . . . . .[...]

  • Page 6

    T ABLE OF CONTENTS iv LDX -3232 [...]

  • Page 7

    LIST OF FIGURES 04_06 LDX -3232 v                    L IST OF F IGURES Figure 1.1 LDX-3232 Fron t View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 1.2 LDX-3232 Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2.1 Common Laser Cathode - Photodio[...]

  • Page 8

    LIST OF FIGURES vi LDX -3232 [...]

  • Page 9

    LIST OF T ABLES 04_06 LDX -3232 vii                    L IST OF T ABLES T able 2.1 LDX-3232 Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . 10 T able 2.2 LDX-3232 Error Indicators . . . . . . . . . . . . . . . . . . . . . . . . . 19 T able 3.1 Substitute Parameter Names . .[...]

  • Page 10

    LIST OF T ABLES viii LDX -3232 [...]

  • Page 11

    SAFETY AND W ARRANTY INFORMATION 04_06 LDX -3232 ix  S AFETY AND W ARRANTY I NFORMATION The Safety and W arranty Information section provides details about cautio nary symbols used in the manual, safety markings used on th e instrument, and information about the W arranty including Customer Service contact informa tion. Safety Information and th[...]

  • Page 12

    SAFETY SYMBOLS x LDX -3232  All instruments returned to ILX Lightwave are required to have a Retu rn Authorization Nu mber assigned by an of ficial represent ative of ILX Lightwave Corporation. See Returning an Instrume nt on page xi for more in formation. S AFETY S YMBOLS This section describes the safe ty symbols and classifications. T echnica[...]

  • Page 13

    WA R R A N T Y 04_06 LDX -3232 xi  W ARRANTY ILX LIGHTW A VE CORPORA TION warrants th is instrument to be free from defects in materia l and workmanship for a period of one year from date of shipment. During the warranty period, ILX will repa ir or replace the unit, at our option, without charge. Limitations This warranty does not apply to fuses[...]

  • Page 14

    WA R R A N T Y xii LDX -3232  6 Send the instrument, transportation pre-paid, to ILX Lightwave. Clearly write the return authorization number on the outside of the box and on the shippi ng paperwork. ILX Lightwave recommends you insure the shipment. If the original shipping cont ainer is not available, place your in strument in a container with [...]

  • Page 15

    WA R R A N T Y 04_06 LDX -3232 xiii  Comments, Suggestio ns, and Problems T o ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or servic e related questions or comment s to ILX Lightwave Customer Support. Y ou may cont act us in whatever way is mo st conveni ent: Phone . . . . . . . . .[...]

  • Page 16

    WA R R A N T Y xiv LDX -3232  in a container with at least 3 in ches (7 .5 cm) of compressible packa ging material on all sides. We loo k forward to serving you even better in the fut ure![...]

  • Page 17

    INTRODUCTION AND SPECIFICATIONS Product Overview 04_06 LDX -3232 1 CHAPTER 1  CHAPT ER 1                   I NTRODUCTION AND S PECIFICATIONS This chapter is an in troduction to the LDX-3232 Hig h Compliance Current Source. This chapter conta ins first time setup info rmation, important sa fet[...]

  • Page 18

    INTRODUCTION AND SPECIFICATIONS Initial Inspection 2 LDX-3232 CHAPTER 1  Initial Inspection When you receive your LDX-323 2 instrument, verify that the followin g items were shipped with the instrument: • LDX-3232 High Compliance Current Source • LDX-3232 Series Instruction Manua l • Power Cord • Shipping Kit Installing Your LDX-3232 Hig[...]

  • Page 19

    INTRODUCTION AND SPECIFICATIONS Installing Y our LDX-3232 High Compliance Current Source 04_06 LDX -3232 3 CHAPTER 1  GPIB Connector The IEEE 488 GPIB interface connector is located on the rear p anel, directly above the power input module an d fuse. See Figure 1.2, LDX-3232 Rear V iew . Attach the GPIB cab le to the 24-pin connector loca ted on[...]

  • Page 20

    INTRODUCTION AND SPECIFICATIONS Installing Y our LDX -3232 High Compliance Current Source 4 LDX-3232 CHAPTER 1  Figure 1. 1 LDX-3232 Front View Figure 1.2 LDX-3232 Rear View Laser Mode Selection Current Range Selection Parame ter Selection GPIB Section Power Switch Display Adjust Section Modulation Input Connector Fan Tr i g g e r O u t p u t Co[...]

  • Page 21

    INTRODUCTION AND SPECIFICATIONS Maintenance 04_06 LDX -3232 5 CHAPTER 1  Maintenance Y ou may have to return yo ur instrument to th e ILX Ligh twa ve facility at some time for repair or service whether or not it is under wa rranty . There is a charge for repairs af ter the warranty period ha s expired. Contact an ILX Lightwave service representa[...]

  • Page 22

    INTRODUCTION AND SPECIFICATIONS Specifications 6 LDX-3232 CHAPTER 1  Specifications LDX-3232 Drive Current Output 1 Output Current Ra nge 0 to 2000 mA 0 to 4000 mA Setpoint Resolution 2 40 µA 80 µA Setpoint Accuracy (% of FS) ±0.05% ±0.05% Compliance V oltage 0 - 15 V , adjus table 0 - 15 V , adjustable T emperature Coefficient <100 ppm/?[...]

  • Page 23

    INTRODUCTION AND SPECIFICATIONS Specifications 04_06 LDX -3232 7 CHAPTER 1  Notes 1. All values relate to a one-hour warm-up pe riod at room temperature, 25 °C. 2. Based on resolut ion of digi tal-to-analo g converters use d in the desig n. 3. Over any 1-hour pe riod, half-scale out put. 4. Over any 24-hour p eriod, half-scale output. 5. Measur[...]

  • Page 24

    INTRODUCTION AND SPECIFICATIONS Specifications 8 LDX-3232 CHAPTER 1  8. Maximum monitor photodiode cu rrent drift over any 30 minut e per iod. Assumes zero drif t in responsivity of photo diode. 9. 50% modulation at mid- scal e output. Higher bandwid th is possible with smaller magnitude modulat ion signal. 10.Similar resolution available over G[...]

  • Page 25

    OPERATION Applying P ower to Y our LDX-3232 04_06 LDX -3232 9 CHAPTER 2  CHAPT ER 2                   O PERATION This chapter introduces you to the ope ration of the LDX-3232 High Compliance Current Source. It of fers instructions for connecting your laser to the current source and describes [...]

  • Page 26

    OPERATION Connecting to the Laser 10 LDX -3232 CHAPTER 2  The Power On State Y ou can choose to "clear" the last saved st ate by recalling the default values. These values are stored in BINS to that you can save or recall instrument configurations (described in more de tail in Chapter 5). "BIN 0" cont ains all of the default [...]

  • Page 27

    OPERATION Connecting to the Laser 04_06 LDX -3232 11 CHAPTER 2  grounds in the circuit. Multiple earth grounds may provide circuit paths that indu ce spurious currents in the photodiode feedb ack circuit and output leads. Note: Cable connections to the laser must be secure! Loo se connectio ns can cause momentary open circuits that can damage th[...]

  • Page 28

    OPERATION Connecting to the Laser 12 LDX -3232 CHAPTER 2  Figure 2.4 Common Laser Anode - Pho tod iode Anode The 9-pin connector marked CURRENT SOUR CE on the back panel is used to connect your laser diode to the LDX-3232. The re are connections provided for laser cathode and anode, photodiod e cathode and anode, chassis ground and interlock. Th[...]

  • Page 29

    OPERATION Connecting to the Laser 04_06 LDX -3232 13 CHAPTER 2  Photodiode Connections Many laser diode modules cont ain an int ernal photodiode that monitors th e back- facet emission of the laser . Usually , this photodiode is internally connected to either the laser anode or cathode. The photodiode and laser con nections to the LDX-3232 are e[...]

  • Page 30

    OPERATION Fr o n t Pa n e l O p e r a t i o n 14 LDX -3232 CHAPTER 2  Front Panel Operation This section describes fundament als of operation for you r LDX-3232 in two operating modes: Con stant Current (I) an d Constan t Power (P). The Display The digital display is used to show contro l p arameters such as laser drive current (mA), laser curre[...]

  • Page 31

    OPERATION Operating a Laser in Constant Current (I) Mode 04_06 LDX -3232 15 CHAPTER 2  Setting Up the Precision Current Source Set the LDX-3232 in Const ant Current, low bandwid th mode by selecting I in the MODE section of th e front panel. Do this by toggling the SELECT push button until the I indicator is illuminated. Repeatedly pressing the [...]

  • Page 32

    OPERATION Operating a Laser in Co nstant Current (I) Mode 16 LDX -3232 CHAPTER 2  T o set the current source limit, use the SELECT push button in the P ARAMETER section of the front panel to select LIM I. Press and hold the (P ARAMETER) SET push button and rotate the adjust knob to vary the limit setpo int value. Set the limit to 1750 mA. Once t[...]

  • Page 33

    OPERATION Operating a Laser i n Constant P ower (P) Mode 04_06 LDX -3232 17 CHAPTER 2  Conditions That Will Automatic ally Shut Off th e LASER OUTPUT The following conditions will au tomatically cause the instrument to disable the current source output: • LASER High Power Limit • LASER Interlock / Key Lock T urned Off • LASER Open Circuit [...]

  • Page 34

    OPERATION Operating a Laser in Co nstant Po wer (P) Mode 18 LDX -3232 CHAPTER 2  A method to calculate the responsivity is sugge sted below . 1 Measure (with a calibrated detecto r) the output power of the device. 2 Measure the corresponding photodiod e current. 3 Calculate the responsivity by dividing the photodiode current by the optical power[...]

  • Page 35

    OPERATION Error Indica tors 04_06 LDX -3232 19 CHAPTER 2  Now the instrument is config ured to operate in Const ant Power Mode. In the MODE section , enable th e output of the laser current source by depressing the OUTPUT push button once. The acco mpany ing LED labeled ON will illuminate indicating that the laser output is on and current is bei[...]

  • Page 36

    OPERATION Error Indicators 20 LDX -3232 CHAPTER 2 [...]

  • Page 37

    REMOTE OPERATION 04_06 LDX -3232 21 CHAPTER 3  CHAPT ER 3                   R EMOTE O PERATION Everything you learned to do from th e front pan el can also be done remotely and in some cases, with more flexibility . For instance, in re mote mode, you have access to commands for functions no t[...]

  • Page 38

    REM O TE O P ER A TI O N LDX -3232 Current Source Command Set 22 LDX -3232 CHAPTER 3  Changing Operation from Local to Remote Sending a command over the GPIB will automatically p ut the instrument in REMOTE mode. The REMOTE indicator will identify when the Current Source is in remote operation mode. When the instrument is in REMOTE mode, pressin[...]

  • Page 39

    REMOTE OPERATION LDX -3232 Current Source Command Set 04_06 LDX -3232 23 CHAPTER 3  The syntax of the LDX-3232 High Compliance Current Source comman ds fo llows the rules laid out in the GPIB-IEEE488 standard. Colon s (:) indicate the start of a new command pa th, while semicolons (;) indicate a separation of commands within a command string. A [...]

  • Page 40

    REM O TE O P ER A TI O N LDX -3232 Current Source Command Set 24 LDX -3232 CHAPTER 3  If multiple pa rameters are expecte d, they should be sepa rated with commas: LAS:INC 100,50 A query has no sp ace between the mnemonic and t he question mark: LAS:LDI? The LDX-3232 High Compliance Current Source uses a terminator of <NL><^END> (new[...]

  • Page 41

    REMOTE OPERATION Command P aths 04_06 LDX -3232 25 CHAPTER 3  Command Paths The LDX-3232 High Compliance Current Source device-dep endent commands are structured into a tree format (see Figure 3.1). Each of the le gal paths is liste d below , followed by its list of p ath options, each of that is followed by the commands themselves. It is recomm[...]

  • Page 42

    REM O TE O P ER A TI O N IEEE488.2 Command Commands 26 LDX -3232 CHAPTER 3  IEEE488.2 Command Commands The IEEE488.2 Common Commands and Queries are distin guished by the "*" that begins each mnemonic. The dia grams below show the synt ax structure for common commands, common co mmands with numeric da ta required, and command command q[...]

  • Page 43

    REMOTE OPERATION LDX -3232 F requently U sed Commands 04_06 LDX -3232 27 CHAPTER 3  LDX-3232 Frequently Used Commands The LDX-3232 High Compliance Current Source’ s complete command set contains over 60 commands that allow you to operate the current source f or a variety of applications. Within the comm and set, however , is a smaller subset o[...]

  • Page 44

    REM O TE O P ER A TI O N Status Reporting 28 LDX -3232 CHAPTER 3  Status Reporting This section contain s information that is relevant for un derstand ing instrument error and statu repo rting. It also cont ains information regarding the use o f the instrument status for gen erating interrupt s for interrupt driven programs o r subroutines. Unde[...]

  • Page 45

    REMOTE OPERATION Status Reporting 04_06 LDX -3232 29 CHAPTER 3  For example, the user may turn the current source on ( LAS:O UT 1 ), enable an SRQ on Operation Comp lete (set *ESE 1 and *SRE 5 ), and have an SRQ handling routine in the user's sof tware, that reads a new measurement af ter the output on st ate has been reached. This allows t[...]

  • Page 46

    REM O TE O P ER A TI O N Status Reporting 30 LDX -3232 CHAPTER 3  Output Off Register The Output Of f Enable Register allows you to determine that conditions and events in the LDX-3 232 High Compliance Current Source ca n cause the current source output to be turned of f. This reigster is configured in a manner similar to the status report ing r[...]

  • Page 47

    REMOTE OPERATION Status Reporting 04_06 LDX -3232 31 CHAPTER 3  r Figure 3.3 LDX-3232 Outpu t Off Register 0 - LASER Current Limit 8 - N/A 1 - LASER V oltage Limit 9 - LASER Output Changed to be Out of T olerance 2 - N/A 10 - N/A 3 - LASER Power Limit (output on) 1 1 - N/A 4 - N/A 12 - N/A 5 - N/A 13 - N/A 6 - N/A 14 - N/A 7 - N/A 15 - N/A 76543[...]

  • Page 48

    REM O TE O P ER A TI O N Command T iming and Completion 32 LDX -3232 CHAPTER 3  Command Timing and Completion This section describes, for each de vice-dependent command, whether tha t command is performed in an overlapped or sequential manner . In other words, it states whether the next command may begin while the current command is being execut[...]

  • Page 49

    REMOTE OPERATION Error Mess ages 04_06 LDX -3232 33 CHAPTER 3  (up to 10 may be stored). Reading the erro r queue via GPIB clears the error queue. T able 3.4 Error Code Classifications T able 3.5 LDX-3232 Seri es Error Codes Error Code Range Area of Operation E-001 to E-099 Internal Pr ogram Errors E-100 to E-199 Parser Errors E-200 to E-299 Exe[...]

  • Page 50

    REM O TE O P ER A TI O N Error Messages 34 LDX -3232 CHAPTER 3  Error Code Explanation E-501 LASER interlock disabled output E-503 LASER open circ uit disabled output E-504 LASER current lim it disabled output E-505 LASER voltage limit disabled output E-507 LASER power limit disabled output E-510 LASER out of tole rance disabled output E-51 1 LA[...]

  • Page 51

    COMMAND REFERENCE 04_06 LDX -3232 35 CHAPTER 4  CHAPT ER 4                   C OMMAND R EFERENCE This chapter is a guide to all of t he d evice-dependent commands for the LDX-3232 High Compliance Current Source. This cha pter is divided into two part s. The first p art contains an o vervi ew [...]

  • Page 52

    COMMAND REFERENCE 36 LDX -3232 CHAPTER 4  Name Parameters Function LAS:CAL:MDI? NONE Returns the ready state for entering the monitor photodiode current calibration value LAS:COND? NONE Returns the value of th e LASER condition register LAS:DEC 0, 1 or 2 Used to decreate the laser current se tpoint value by one or more steps LAS:DIS 1 T urns the[...]

  • Page 53

    COMMAND REFERENCE 04_06 LDX -3232 37 CHAPTER 4  Name Parameters Function LAS:LIM:I2 1 Used to set the LASER low range current source limit LAS:LIM:I2? NONE Used to return the LASER low range current source limit LAS:LIM:I4 1 Used to set the LA SER high range current source limit LAS:LIM:I4? NONE Used to return the LASER high range current source[...]

  • Page 54

    COMMAND REFERENCE 38 LDX -3232 CHAPTER 4  Name Parameters Function LAS:TOL? NONE Used to return the LASER setpoint tolerance value and time period value MES 1 Used to enter a string message of up to 16 bits MES? NONE Returns a previously stored ASCII message RAD 1 Sets the radix type for numerical data; decimal, binary , octal or hexadecimal RAD[...]

  • Page 55

    COMMAND REFERENCE LDX -3232 Device-Dependent Commands 04_06 LDX -3232 39 CHAPTER 4  LDX-3232 Device-Dependent Commands This section contain s all of the dev ice-dependent commands for the LDX-3232 High Compliance Current Source, listed in alphabetical ord er . Sub-sections for each path are presented, listing the commands that are legal for that[...]

  • Page 56

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 40 LDX -3232 CHAPTER 4  LDX-3232 Device-Dependent Command Reference The following pag es contain a refere nce for the device-depend ent commands of the LDX-3232 High Compliance Current Source. This reference co ntains useful information for both local and remote op eration of the LD[...]

  • Page 57

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 41 CHAPTER 4  The ERRors? query returns a list of comm and and devi ce errors that have occurred since the last query . These errors are notated by a n umber that corresponds to the type of error that occurred. See Chapter 3 for information regarding error handling. S[...]

  • Page 58

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 42 LDX -3232 CHAPTER 4  The LASer:CALMD? query returns the valu e of the laser's photod iode feedback responsivity (CAL PD parameter) setting. Syntax Diagram Notes If this value is 0, the LDX-3232 will be set to operate in constant I PD mode, and the I PD setpoint value will be[...]

  • Page 59

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 43 CHAPTER 4  The LASer:CAL:LDI command is used to enter the LASER current setpoint, measurement, and limit (in low bandwidth mode) calibration mode. Syntax Diagram Parameters None Notes Since the limit circuit is the same for both high and low bandwidth modes, it is [...]

  • Page 60

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 44 LDX -3232 CHAPTER 4  The LASer:CAL:LDI? query is used to determine that the LDX-3232 is ready for a value to be entered during the calibrat ion cycle of the L ASer:CAL:LDI mode. Syntax Diagram Notes After this query is issued and a resp onse of 1 is receive d, the LDX-3232 will b[...]

  • Page 61

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 45 CHAPTER 4  The LASer:CAL:LDV? query is used to determine tha t the LDX-3232 is ready for a value to be entered during the calibrat ion cycle of the LASer:CAL:LDV mode. Syntax Diagram Notes After this query is issued and a resp onse of 1 is receive d, the LDX-3232 w[...]

  • Page 62

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 46 LDX -3232 CHAPTER 4  The LASer:CAL:MDI? query is used to determi ne that the LDX-323 2 is ready for a value to be entered during the calibrat ion cycle of the LASer:CAL:MDI mode. Syntax Diagram Notes After this query is issued and a response of 1 is re ceived, the LDX-3 232 be re[...]

  • Page 63

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 47 CHAPTER 4  Circuit conditio n is fleeting and may be missed via the LAS:COND? que ry . Therefore, the user should test for the Open Circuit Event via the LAS:EVEnt? query . The LASER condition status is c onstantly changing, while the ev ent st atus is only cleared[...]

  • Page 64

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 48 LDX -3232 CHAPTER 4  The LASer:DIS play command enables or disables (turns off) the display and some LEDs Syntax Diagram Parameters An <nrf value> ; -where 1 = on, 0 = of f. Notes T urning the display and LEDs off means that a message of all blank spaces is se nt to the dis[...]

  • Page 65

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 49 CHAPTER 4  The LASer:DIS play:LDI command sets the lase r display to show th e const ant current measurement. Syntax Diagram Parameters None. Notes The LDI measurement display mode is turned off automatically when another display selection is enabled. Examples &quo[...]

  • Page 66

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 50 LDX -3232 CHAPTER 4  The LASer:DIS play:LDV command sets the laser display to show the laser forward voltage measurement. Syntax Diagram Parameters None Notes The LDV measurement mode is turned off automatically when another display selection is enabled. Examples "LAS:DIS:LD[...]

  • Page 67

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 51 CHAPTER 4  The LASer:DIS play:MDI command sets the laser display to sho w the monitor photodiode current measurement. Syntax Diagram Parameters None Notes The MDI measurement display is turn ed off automatically when anot her display selection is enabled. Examples [...]

  • Page 68

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 52 LDX -3232 CHAPTER 4  The LASer:DIS play:MDP command sets the display to show the monitor photodiode power measurement. Syntax Diagram Parameters None Notes The MDP measurement display is turned off automatically when another display selection is enabled. Examples "Las:Displa[...]

  • Page 69

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 53 CHAPTER 4  The LASer:DIS play:P ARAM command enables the display to show the parameter values. Syntax Diagram Parameters None Notes This command has the same effect as pressing t he (P ARAM ETER) SELECT switch while in LASER mode. The selected parameter will be dis[...]

  • Page 70

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 54 LDX -3232 CHAPTER 4  The LASer:DIS play:SET? query returns the status of the setpoint display mode. Syntax Diagram - where the response is 0 or 1. Notes The setpoint display will not time out when REMOTE operati on is used. (It will be continuously displayed.) Examples "LAS:[...]

  • Page 71

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 55 CHAPTER 4  Examples "LAS:ENAB:COND 129" -action: enables the LASER status conditio n register so that the Open circuit and LASER current limit conditions will be summariz ed in the status byte (bit 3). Laser:Enable:Cond #H0 F9B" - action: enables the[...]

  • Page 72

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 56 LDX -3232 CHAPTER 4  The LASer:ENABle:EVEnt command sets the st at us event enable r egister of the LASER operations. These events are summarized in bit 2 of the status byte register . Syntax Diagram Parameters An <nrf value> whose sum represents the bits that are enabled: [...]

  • Page 73

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 57 CHAPTER 4  The LASer:ENABle:EVEnt? query returns the value of the status event enable register of the LASER operations. Syntax Diagram - where the response is the sum of the followin g: Notes The enabled LASER events can be set by using the LASer:ENABle:EVEnt comma[...]

  • Page 74

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 58 LDX -3232 CHAPTER 4  The LASer:ENABle:OUTOFF command sets the status outoff enable register of the LASER operations (things that will turn the LASER output off). Syntax Diagram Parameters An <nrf value> whose sum represents the enabled bits: Notes The enabled LASER outoff b[...]

  • Page 75

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 59 CHAPTER 4  . The LASer:ENABle:OUTOFF? query returns the va lue of the status outoff enable register of the LASER operation s. Syntax Diagram -where the response is the sum of the fo llow ing: Notes The enabled LASER events can be set by using the LASer:ENABle:OUT O[...]

  • Page 76

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 60 LDX -3232 CHAPTER 4  The LASer:EVEnt? query returns the value of the status event register of the LASER operations. Syntax Diagram -where the response is the sum of the fo llow ing: Notes The LASER condition s that are reported in the st at us byte can be set by us ing the LASer:[...]

  • Page 77

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 61 CHAPTER 4  The LASer:INC command increments the selected laser control mo de setpoint by one or more steps. Optional parameters allow multiple steps to be incremented and the time (i n ms) between increments to be set, respectively . This is an overlap ped command.[...]

  • Page 78

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 62 LDX -3232 CHAPTER 4  The LASer:LDI command sets the laser control current. Syntax Diagram Parameters An <nrf value> that represents the (laser) output current i n mA. Notes setpoint is the same for both low and hi gh bandwidth output modes. Examples "Las:LDI 400" [...]

  • Page 79

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 63 CHAPTER 4  The LASer:LDV command sets the laser voltage for calibration of the laser voltage measurement. Syntax Diagram Parameters An <nrf value> th at represents the (laser) output voltage, in volts. Notes setpoint is the same for both low and hi gh bandwid[...]

  • Page 80

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 64 LDX -3232 CHAPTER 4  The LASer:LIMit:I2 command sets the LASER current limit value for the 2000 mA range on the LDX-3232. Syntax Diagram Parameters An <nrf value> that repre s e n t s the LASER l im it curre nt , in m A. Notes The current limit is in ef fect in all modes of[...]

  • Page 81

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 65 CHAPTER 4  The LASer:LIMit:I4 command sets the LASER current limit value for the 4000 mA range on the LDX-3232. Syntax Diagram Parameters An <nrf value> that repre s e n t s the LASER l im it curre nt , in m A. Notes The current limit is in ef fect in all mod[...]

  • Page 82

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 66 LDX -3232 CHAPTER 4  The LASer:LIMit:MDP command sets the laser monitor photodiode pow er limit value. Syntax Diagram Parameters An <nrf value> that represents the laser monitor photodiod e power limit in mW . Notes When constant MDP mode is used, the output le vel is limit[...]

  • Page 83

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 67 CHAPTER 4  The LASer:LIMit:V command set s the LASER comp liance voltage limit value. Syntax Diagram Parameters An <nrf value> that represents the LASER limit voltage, in volts. Notes The voltage limit setting is useful for laser protection. When the maxi mum[...]

  • Page 84

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 68 LDX -3232 CHAPTER 4  The LASer:MDI command sets the val ue of the optical power setpoint, in µ A, if the CALMD (CAL PD) responsivity is 0. Syntax Diagram Parameters An <nrf value> that represents the photodiode feedback current, in µA. Notes If the CALMD (CAL PD) paramete[...]

  • Page 85

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 69 CHAPTER 4  The LASer:MDLN command enable s or disables (turns off) the front panel modulation input (BNC). Syntax Diagram Parameters An <nrf value> - where 1=on, 0=off. Notes After turning the modulation off, it will remain off until turned back on via this c[...]

  • Page 86

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 70 LDX -3232 CHAPTER 4  The LASer:MDP command sets the value of the optical power setpoint in mW if the CALMD (CAL PD) responsivity is greater than 0. Syntax Diagram Parameters An <nrf value> that represents the photodiode feedback power in mW . Notes If the CALMD (CAL PD) par[...]

  • Page 87

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 71 CHAPTER 4  The LASer:MODE? query returns t he selected laser co ntrol mode. Notes I HBW mode is the same as I mode (low bandwid th), except th at the outp ut low bandpass filter is disabled in I HBW mo de. Examples "LAS:MODE?" -response: IL BW , means tha[...]

  • Page 88

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 72 LDX -3232 CHAPTER 4  The LASer:MODE:ILBW command select s laser constant current mode. Parameters None Notes Constant I mode (low bandwidth) enables the output low bandpass filter . Examples "LAS:MODE:ILBW" -action: sets the lase r output for constant I mode (low bandwi[...]

  • Page 89

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 73 CHAPTER 4  The LASer:OUTput command turns the laser output on or off. Parameters An <nrf value> ; 1=on, 0=of f. Notes There is a two-second delay after the output is turned on be fore the output shorting relay is opened. Following this, the output current ram[...]

  • Page 90

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 74 LDX -3232 CHAPTER 4  The LASer:RANge command selects the laser's drive current output range. Parameters An <nrf value> that represents the laser current output range. 2 = 2000 mA, and 4= 4000 mA range Notes This range setting effects the Laser Drive Current output curr[...]

  • Page 91

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 75 CHAPTER 4  The LASer:SET :LDI? query returns the const ant I value that is used for both output ranges and both bandwidths. - where the response is the constant I setpoint value, in mA. Notes In local operation, the constant I setpoint is read by selecting I or I H[...]

  • Page 92

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 76 LDX -3232 CHAPTER 4  "LAS:Set:MDI?" -response: 100.0 means the laser mo nitor photodiode current is setpoint is 100 µ A, for use in constant P mode with CALMD=0. The LASer:SET :MDP? query returns the laser moni tor ph otodiode power setpoint va lue (when CALMD [CAL PD][...]

  • Page 93

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 77 CHAPTER 4  The LASer:STEP? query is used to read back the LASer STEP val ue. This value is used to increment or decrement the selected lase r control mode setpo int by the given a mount when used with the LASer:INC or LASer:DEC command. - where the response is an i[...]

  • Page 94

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 78 LDX -3232 CHAPTER 4  The LASer:TOLerance? query allows the programmer to determine how the LASER current tolerance is set. - where the response consists of two values, the first is the current tolerance in mA and the second is the time window , in seconds. Notes The tolerance of [...]

  • Page 95

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 79 CHAPTER 4  The MESsage? query returns the previously stored me ssage. Th is message will always be 16 bytes long and enclosed in quotes. The message is entered via the MESsage command. - where the response is a 16-byte long cha racter string. Notes The response dat[...]

  • Page 96

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 80 LDX -3232 CHAPTER 4  "rad hex; *ESR?" -action: the hexadecimal radix is selected; -response: #H80, means power-on was detected. The RADix? query allows the programme r to determine that radix type for status, condition, and event query re sponse data is currently select[...]

  • Page 97

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Reference 04_06 LDX -3232 81 CHAPTER 4  The TERM? query allows the programm er to determine whether th e default (IEEE488.2 standard) terminator has been altered to include a carriage return. - where the response is 0 or 1. Notes An altered terminator will be in the form <CR><NL>&l[...]

  • Page 98

    COMMAND REFERENCE LDX -3232 Device-Dependent Command Refere nce 82 LDX -3232 CHAPTER 4  The TIMER? query allows the programmer to determine ho w much time has passed since the last TIMER? query was issued. - where the response is character data that represents hours:minutes:seconds. Notes Each time the TI MER? query is issued, the timer is re se[...]

  • Page 99

    F UNCTIONS AND F EATURES Saving and Rec alling from the F ront P anel 04_06 LDX -3232 83 CHAPTER 5  CHAPT ER 5                   F UNCTIONS AND F EATURES This chapter introduces you to the LDX-3232 High Compliance Current Source functions and operating featu res such as event trigge ring, ana[...]

  • Page 100

    F UNCTIONS AND F EATURES Saving and Recalli ng Under Remote Operation 84 LDX -3232 CHAPTER 5  T o recall a previously saved instrument setup, press the SELECT switch until the RECALL indicator led become s lit. The instrument will display a RECALL "bin" number on the display . If you desire to change the RECALL b in, press and hold the[...]

  • Page 101

    F UNCTIONS AND F EATURES Using the LDX -3232 Current Source’s T rigger F unction 04_06 LDX -3232 85 CHAPTER 5  Using the LDX-3232 Current Source’s Trigger Function For applications where you need to synchr on ously initiate a measurement task from a remote instrument with the LDX-3232 Current Source, the Current Source offers a trig ger outp[...]

  • Page 102

    F UNCTIONS AND F EATURES Using the LDX -3232 Current Sources’s BNC Interlock Connection 86 LDX -3232 CHAPTER 5  Using the LDX-3232 Current Sources’s BNC Interlock Connection The LDX-3232 BNC interlock connection is designed to allow an external emergency input signal t o turn the current output of f. The BNC interlock is TTL compatible and c[...]

  • Page 103

    F UNCTIONS AND F EATURES Modulating the Laser Current Source 04_06 LDX -3232 87 CHAPTER 5  Setting up the Current Source for a modulated laser inject ion current is easy . The (MOD) EXTERNAL connector (BNC) on the front panel is the input for the modula ted signal. Connect a modulating voltag e signal from a st andard function generator , for ex[...]

  • Page 104

    F UNCTIONS AND F EATURES Modulating the Laser Current Source 88 LDX -3232 CHAPTER 5  T o disable the output, press the OUTPUT push button aga in. When the LDX-3232 current output is of f, an internal short is placed across the output. T his short will prevent the modulation signal f rom reac hing the LED in our example experiment. Thus, it is sa[...]

  • Page 105

    CALIBRATION AND TROUBLESHOOTING Calibration Over view 04_06 LDX -3232 89 CHAPTER 6  CHAPT ER 6                   C ALIBRATION AND T ROUBLESHOOTING This chapter describes calibration of your LDX-3232 Serie s Current Source. Descriptions of the required test instrument s, calibration conditions[...]

  • Page 106

    CALIBRATION AND T ROUBLESHOOTING Recommended Equipm ent 90 LDX -3232 CHAPTER 6  Finally , the LDX-3232 Current Source should be allowed to warm up for at least one hour before calibration. Recommended Equipment Recommended test equipment for calibrating the L DX-3232 Current Source is listed in T able 6.1. Equipment other than that shown in th e[...]

  • Page 107

    CALIBRATION AND TROUBLESHOOTING Local Calibration of the LDX-3232 Current Source 04_06 LDX -3232 91 CHAPTER 6  Figure 6.1 I PD Calibrati on Circuit Local Calibration of th e LDX-3232 Current Source There are three calibration adjustments required for the LASER current source of the LDX-3232 Current Source. They are calibration of th e constant c[...]

  • Page 108

    CALIBRATION AND T ROUBLESHOOTING Local Calibration of the LDX -3232 Current Source 92 LDX -3232 CHAPTER 6  a. Measure and record the resistance of a 1 Ω , 20 W resistor (A 4-wire [Kelvin] resistance measurement is recommended .) Connect the load resistor across the LASER output terminals (Laser Anode and Laser Cath ode) on the 9 pin connector o[...]

  • Page 109

    CALIBRATION AND TROUBLESHOOTING Local Calibration of the LDX-3232 Current Source 04_06 LDX -3232 93 CHAPTER 6  LDX-3232 Series Current Source then automatically calibrates the LASER feedback circuit s. Configure the Current Source in th e following manner for the Laser Current Source calibration: a. With the LASER output off, connect a cali brat[...]

  • Page 110

    CALIBRATION AND T ROUBLESHOOTING Local Calibration of the LDX -3232 Current Source 94 LDX -3232 CHAPTER 6  g. Release the (P ARAMETER) SET switch to acc ept the second calibration point. After the (P ARAMETER) SET switch is released, the LDX-3232 Se ries Current Source will calculate the calibration constants and store them to nonvolatile memory[...]

  • Page 111

    CALIBRATION AND TROUBLESHOOTING Remote Calibration of the LDX -3232 Current Source 04_06 LDX -3232 95 CHAPTER 6  Remote Calibration of the LDX-3232 Current Source The LDX-3232 Current Sources can be calibra ted remotely via the GPIB Interface. All of the require d calibration command s are listed in T able 4.1 in Chapter 4. The procedures below [...]

  • Page 112

    CALIBRATION AND T ROUBLESHOOTING Remote Calibration of the LDX -3232 Current Source 96 LDX -3232 CHAPTER 6  a. Measure and record the resistance of a 1 Ω , 20 W resistor . (A 4-wire [Kelvin] resistance measurement is recommended .) Connect the load resistor across the LASER output terminals (Laser Anode and Laser Cath ode) on the 9 pin connecto[...]

  • Page 113

    CALIBRATION AND TROUBLESHOOTING Remote Calibration of the LDX -3232 Current Source 04_06 LDX -3232 97 CHAPTER 6  Configure the current source in the following man ner for the laser current sour ce calibration: a. With the LASER output off, connect a cali brated ammeter to the PD Anode output of the Laser Current Source output connector (9 pin on[...]

  • Page 114

    CALIBRATION AND T ROUBLESHOOTING Remote Calibration of the LDX -3232 Current Source 98 LDX -3232 CHAPTER 6  Laser Forward Voltage Measurement Calibration The following procedure is for calibr ating the LASER volt age measurement. Configure the current source in the following man ner for the laser current sour ce voltage calibration: a. With the [...]

  • Page 115

    CALIBRATION AND TROUBLESHOOTING T roubleshooting Guide 04_06 LDX -3232 99 CHAPTER 6  Troubleshooting Guide This section is a guide to troubleshooting th e LDX-3232 Current Sources. Some of the more common symptoms are listed here, and the ap propriate troubleshooting actions are given. W e recommend that the user start at the beginning of this g[...]

  • Page 116

    CALIBRATION AND T ROUBLESHOOTING T roubleshooting Guide 100 LDX -3232 CHAPTER 6  Symptom Corrective Actions Unable to adjust output Check the I LIMIT pa rameter for the output range in use, see that it is set above 0 mA. Power mode operation h as high output current, but little o r no power measured Check back panel PD BIAS; if set too low , ma [...]

  • Page 117

    CALIBRATION AND TROUBLESHOOTING Error Mess ages 04_06 LDX -3232 101 CHAPTER 6  Error Messages In the event of a hardware error co ndition, error messages will be displayed on the display . In most cases, the error message will appear for three seconds. In some cases the error code display will remain until the user chan ges display modes. In the[...]

  • Page 118

    CALIBRATION AND T ROUBLESHOOTING Error Messages 102 LDX -3232 CHAPTER 6  Error Code Explanation E-203 Security violation, command is not available witho ut clearance E-205 <PROGRAM DA T A> is not a Boolean value or word E-207 <PROGRAM DA T A> will not convert to an unsig ned 16 -bit value E-209 <PROGRAM DA T A> will not convert[...]