ILX Lightwave LDC-3700B Series User Manual Download Page 95

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C O M M A N D R E F E R E N C E

Command Reference

LDC-3700 Series

C H A P T E R

The LASer:MDI command sets the value of the optical power set point, in

A, if the CALMD (CAL PD) responsivity is

Parameters

An <nrf value> which represents the photodiode feedback current, in

Notes

If the CALMD (CAL PD) parameter is not set to 0, the LAS:MDI value will not be used. In this case,
the measured MDI would be converted to MDP (P

, by the CAL PD factor), and the MDP (P

) set

point would be used.

Examples

"Las:Mdi 40" −action: The LASER output is controlled so that the photodiode feedback current
remains constant at 40

"Laser:MDI 200" −action: The LASER output is controlled so that the photodiode feedback current
remains constant at 200

The LASer:MDI? query returns the value of the laser photodetector current measurement, in

Notes

The response is in

A. The response is valid, even when the unit is not in constant P mode.

This measurement is updated approximately once every 600 msec.

Examples

"Las:Mode:MDP; Las:Calmd 0; Las:MDi?" −response: 100.0, means 100

A of photodetector

current. This feedback is controlling the laser current output.
"LAS:MODE:IHBW; LAS:MDI?" −response: 20.0, means 20

A of photodetector current, but

photodiode monitor current is not controlling the laser output current.

The LASer:MDP command sets the value of the optical power set point, in mW, if the CALMD (CAL
PD) responsivity is greater than 0.

Parameters

An <nrf value> which represents the photodiode feedback power, in mW.

Notes

If the CALMD (CAL PD) parameter is set to 0, the LAS:MDP value will not be used. In this case, the
measured MDP would be invalid, and the MDI (I

) set point would be used.

Examples

"Las:Mdp 40" −action: The LASER output is controlled so that the photodiode feedback power
remains constant at 40 mW.
"Laser:MDP 200" −action: The LASER output is controlled so that the photodiode feedback power
remains constant at 200 mW.

LASer:MDI

OMMON

EVICE

EPENDENT

RONT

ANEL

LASer:MDI?

OMMON

EVICE

EPENDENT

RONT

ANEL

LASer:MDP

OMMON

EVICE

EPENDENT

RONT

ANEL

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Summary of Contents for LDC-3700B Series

Page 1: ...rutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In sto...

Page 2: ...P O Box 6310 Bozeman MT U S A 59771 1 800 459 9459 www ilxlightwave com U S Canada International Inquiries 406 586 1244 Fax 406 586 9405 E mail support ilxlightwave com 70027304 01_9 02 Artisan Techn...

Page 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 4: ...Damage xi Comments Suggestions and Problems xii Chapter 1 Introduction and Specifications Product Overview 1 Initial Inspection 1 Installing the LDC 3700B 2 Grounding Requirements 2 AC Line Power Requ...

Page 5: ...the Range 17 Select the Laser Display 17 Adjusting the Set Point 17 Set Current Source Limit 18 Automatic Shutoff Conditions for Laser Output 19 Operating a Laser in Constant Power Mode P 20 Entering...

Page 6: ...38 Reading the GPIB Address 39 Changing the GPIB Address 39 Changing Operation from Local to Remote 39 Command Syntax 40 Letters 40 White Space 40 Terminators 41 Command Separators 41 Parameters 41 C...

Page 7: ...rce 118 Current Source Calibration 119 IPD Current Calibration 120 Laser Forward Voltage Measurement Calibration 121 Remote Calibration of the LDC 3700B Controller 122 Thermistor Calibration 122 AD590...

Page 8: ...3700B Series Rear Panel 32 Figure 2 5 Rear Panel TEC Connector 34 Figure 3 1 GPIB Cable Connections 38 Figure 3 2 GPIB Connector Diagram 39 Figure 3 3 Command Path Structure 43 Figure 3 4 Common Comm...

Page 9: ...LDC 3700 Series vi Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 10: ...e Parameter Names 42 Table 3 2 Invalid Syntax Command Strings 44 Table 3 3 LDC 3700B Commonly Used Commands 46 Table 3 4 Default Settings for Output Off Registers 49 Table 4 1 GPIB Command Summary Ref...

Page 11: ...L I S T O F TA B L E S viii LDC 3700 Series Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 12: ...sult in serious injury or death WARNING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the following conditions exist or are even su...

Page 13: ...ng temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation Safety Marking Symbols Th...

Page 14: ...he instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing con...

Page 15: ...hat a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service are responsible for any...

Page 16: ...vides a high stability output with a fully redundant current limit and multiple laser protection features The built in temperature controller can work with most temperature sensors and TE modules to d...

Page 17: ...700B s voltage printed on the rear panel of the instrument To avoid electrical shock hazard connect the instrument to properly earth grounded electrical receptacles only Failure to observe this precau...

Page 18: ...h rack with the optional rack mount kits The kits contain a rack mount flange and hardware for mounting on either side of the enclosure All rack mount accessory kits contain detailed mounting instruct...

Page 19: ...er serviceable parts in the instrument including the external fuses in the AC power entry module Contact ILX Customer Service for information about servicing the instrument How to Obtain Repair Servic...

Page 20: ...any 24 hour period half scale output controlling an LDM 4412 mount 25 C with 10 kW thermistor on 100 mA setting 0 01 C Output Type Bipolar constant current source Compliance Voltage 4 V DC Short Circ...

Page 21: ...itor and Current Source Connectors 9 pin D connector for LASER output External Modulation Connector BNC instrumentation amplifier input Temperature Controller 15 pin D connector for TEC output and the...

Page 22: ...6 Temperature Controlled Laser Diode Mount LDM 4407 Temperature Controlled Laser Diode Mount available with collimating assembly LDM 4412 DIL Laser Diode Mount LDM 4982 Butterfly Laser Diode Mount LDM...

Page 23: ...T R O D U C T I O N A N D S P E C I F I C A T I O N S Installing the LDC 3700B 8 LDC 3700 Series C H A P T E R 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Page 24: ...itch for safety If the interlock is removed the laser current output is disabled Refer to the laser module manual for details about the interlock function The instrument is also equipped with a laser...

Page 25: ...mV depending on the setting of the SENSOR SELECT switch LIM ITE set to 2 0 Amps ITE Set Point 1 0 Amp TEC STEP value 1 LIM THI set to 99 9 C GAIN 30 TEC Tolerance values 0 2 C 5 seconds C2 2 347 x 10...

Page 26: ...the connections to the LDC 3700B Series Laser Diode Controller output be made using twisted wire pairs with an earth grounded shield see Figure 2 1 on page 12 The output terminals of the instrument ar...

Page 27: ...iode Connection Configurations Bias 3700B Series Laser Diode Controller OUTPUT 7 6 9 5 3 P D L D Earth Ground Bias 3700B Series Laser Diode Controller OUTPUT 7 6 9 5 3 P D L D Earth Ground Bias 3700B...

Page 28: ...laser operation until the switch is closed If a short does not exist between these two pins the INTERLOCK LED illuminates on the front panel and the laser output is disabled The interlock terminals o...

Page 29: ...ar panel of your Controller is used to make connections to the thermoelectric TE modules of your laser or laser mount and the temperature sensor There are connections provided for TE module TE module...

Page 30: ...l ground causes catastrophic damage to the instrument For the TEC connector if any one terminal pin is grounded then no other terminal pin can be grounded Do NOT connect the Sensor and TE Module to th...

Page 31: ...ted Operating a laser in Constant Current I Mode Suppose you have an LDC 3724B Laser Diode Controller and you want to run the instrument in Constant Current low bandwidth mode with a set point of 150...

Page 32: ...ler current source to 150 mA set the instrument to LAS mode by pressing the appropriate push button in the ADJUST section of the front panel The LAS indicator will be illuminated Turn the adjust knob...

Page 33: ...fore no dummy load is required for precise adjustment of the current limit Furthermore since the current limit circuitry is fully independent of the main current control the current limit can be adjus...

Page 34: ...output and the Output Shorted indicator illuminates The default condition for the current source output is off when the instrument is first powered up Automatic Shutoff Conditions for Laser Output The...

Page 35: ...the CAL PD parameter select CAL PD with the SELECT push button by toggling down past LIM P The indicator becomes lit when CAL PD is selected and the display indicates the responsivity parameter in A m...

Page 36: ...et point the LASER display will revert to the original display mode I IPD or PPD Before the laser output is enabled the power limit for the laser under test should be set In Constant Power mode this i...

Page 37: ...t is configured to operate in Constant Power Mode In the LASER MODE section enable the output of the laser current source by depressing the OUTPUT push button once The accompanying led labeled ON will...

Page 38: ...IRCUIT 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 Output shorted OUTPUT SHORTED light comes on This ind...

Page 39: ...y section displays which constant you are viewing or adjusting C1 C2 or C3 and the TEC display section displays the value Operating the Controller in Temperature Mode T Suppose you need to operate and...

Page 40: ...fed back to the control loop If you have the thermistor sensor selected then select an appropriate current range with the upper switch The 10 A and 100 A designations are current levels supplied by th...

Page 41: ...oop gain needs to be set The GAIN function sets the analog feedback gain which in part determines how fast the actual temperature reaches and settles to the set point temperature If the gain is set to...

Page 42: ...AD590 set point current in A not enunciated depending on the position of the SENSOR SELECT switch on the rear panel If ITE is selected and the SET push button is pressed the instrument will display t...

Page 43: ...ction This instrument mode will be indicated by the TEC LED Turn theAdjust Knob clockwise to increase the set point as indicated on the TEC display or counterclockwise to decrease the set point When t...

Page 44: ...hile Output is enabled TEC mode changed while output is enabled TEC Error Indicators The LDC 3700B Series Laser Diode TEC Controllers indicate general TEC operational error conditions Each error condi...

Page 45: ...re limit of 40 C and a TE current limit of 2A Once this set up is saved the LDC 3700B Controller may be configured for another unique set up You can recall the original set up for the first experiment...

Page 46: ...circuit Some experimentation may be necessary for optimum results Using the LDC 3700B Controller s Trigger Function For applications where you need to synchronously initiate a measurement task from a...

Page 47: ...constant current low high bandwidth See the section LASER CURRENT SOURCE SPECIFICATIONS in Chapter 1 for external analog modulation bandwidth specifications Setting up the controller for a modulated...

Page 48: ...sh button and rotate the adjust knob clockwise to increase the limit set point value or counterclockwise to decrease the limit set point value Set the limit to 175 mA Once the SET push button is relea...

Page 49: ...e the normal operating maximum of 4 0 Amps to a maximum of 10 0 Amps The control signal voltage 10 V is linearly proportional to the control current which is limited by the LIM I parameter Pins 11 and...

Page 50: ...r Enabled condition is reported in the TEC Condition Status register If the status of the connection between the BOOSTER PRESENT and DIGITAL GROUND changes this event will also be reported in the TEC...

Page 51: ...O P E R A T I O N S Functions and Features 36 LDC 3700 Series C H A P T E R 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 52: ...nterface Messages GPIB devices communicate with each other by sending data and interface messages Data contains device specific information such as programming instructions measurement results and ins...

Page 53: ...rface management line determines whether these lines contain data or interface messages Three handshake lines ensure that all data and messages are reliably transferred NRFD not ready for data indicat...

Page 54: ...range is 0 30 for primary GPIB addressing Extended GPIB addressing is not implemented on the LDC 3700B Series Laser Diode Controller at this time Changing Operation from Local to Remote Sending a comm...

Page 55: ...r case does not matter it is used in this manual to identify optional letters The optional letters must be in the correct sequence Some examples of what works and what does not White Space White space...

Page 56: ...TEC MODE t TEC T 25 TEC Const 1 2 3 5 TEC OUT 1g1 Parameters Some commands require a parameter The parameter must be separated from the command by at least one space The syntax symbol nrf value refer...

Page 57: ...tants on the LDC 3700B Series Laser Diode Controller C1 C2 and C3 the following command could be sent TEC CONST 1 111 2 004 0 456 If not all of the parameters need to be changed the other parameters m...

Page 58: ...with the full path shown for each command and a brief explanation of its usage Figure 3 3 Command Path Structure root com cmds CAL CLS DELAY ERR MES MES RAD RAD SECURE TERM TERM TIME TIMER COND DEC DI...

Page 59: ...rument ignores CR Carriage Return as white space The LDC 3700B terminates its responses with CR NL END unless you use the TERM command to change it You can put more than one command on the same line s...

Page 60: ...CALL function SAV 1 to 10 see front panel SAVE function ESE 0 to 255 see Figure 3 2 SRE 0 to 255 see Figure 3 2 and PUD used at factory only A list of all of the IEEE 488 2 Common Commands supported b...

Page 61: ...e for 3714B high range for 3724B LAS LIM MDP 1 Used to set the constant optical power from monitor PD limit value LAS LIM V 1 Used to set the LASER current source compliance voltage limit value LAS MD...

Page 62: ...elow the register representation For example the LASER Condition Register may be queried via the LASer COND query The condition or event registers are logically ANDed with their respective enable regi...

Page 63: ...M O T E O PE R A T I ON Command Syntax 48 LDC 3700 Series C H A P T E R 3 Figure 3 5 Status Reporting Scheme Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg co...

Page 64: ...The events and conditions which may be set to cause the TEC and LASER outputs to be turned off are shown in Figure 3 6 on page 49 and Figure 3 7 on page 50 The default factory settings for these regi...

Page 65: ...Limit 8 Sensor Type Change while output on Eve 1 TEC Voltage Limit 9 Outside of TEC Tolerance Cond 2 N A 10 Sensor Shorted while output on Cond 3 High Temperature Limit 11 N A 4 N A 12 N A 5 Booster C...

Page 66: ...ntial The operation complete flag is set after the conditions outlined in the Operation Complete Definition have been satisfied The WAI common command is an example of a sequential command which force...

Page 67: ...RE M O T E O PE R A T I ON Command Syntax 52 LDC 3700 Series C H A P T E R 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 68: ...ew of the remote commands used by the LDC 3700B Series Laser Diode Controller The second part contains all of the LDC 3700B Series Laser Diode Controller commands in alphabetical order The commands wh...

Page 69: ...current calibration value LAS CAL LDV NONE Used to enter the laser voltage calibration mode LAS CAL LDV NONE Returns the ready state for entering the laser voltage calibration value LAS CAL MDI NONE...

Page 70: ...LAS LIM I2 1 Used to set the LASER current source limit low range for 3724B LAS LIM I2 NONE Used to return the LASER current source limit low range for 3724B LAS LIM I3 1 Used to set the LASER current...

Page 71: ...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 OPC Generates the OPERATION COMPLETE message in the Standard Event...

Page 72: ...ENAB COND 1 Sets the enable register for TEC conditions TEC ENAB COND NONE Returns the value of the TEC conditions enable register TEC ENAB EVE 1 Sets the enable register for TEC events TEC ENAB EVE...

Page 73: ...erature value TEC TOL 1 or 2 Used to set the TEC set point tolerance value and time period value TEC TOL NONE Used to return the TEC set point tolerance value and time period value TEC V 1 Used to ent...

Page 74: ...g for the Operation Complete flag to be set Parameters An nrf value which represents the delay time in milliseconds Notes The Operation Complete flag is held false until the delay period elapses but t...

Page 75: ...m overlapped commands as previous oper ations complete This may be useful for ensuring that an operation is complete before starting a measurement ESE nrf value Event Status Enable COMMON DEVICE DEPEN...

Page 76: ...if any enabled conditions are true Response is the sum of the enabled bits ESE Event Status Enable COMMON DEVICE DEPENDENT FRONT PANEL 0 Operation Complete 4 Execution Error 1 N A 5 Command Error 2 Q...

Page 77: ...and allows you to determine which type of error has occurred ESR Standard Event Status Register COMMON DEVICE DEPENDENT FRONT PANEL 0 Operation Complete 4 Execution Error 1 N A 5 Command Error 2 Query...

Page 78: ...rameter Parameters An nrf value in microamps milliwatt The range is 0 to 1000 Notes If the parameter is set to 0 the LDC 3700B Series Laser Diode Controller will operate in a constant IPD mode when Co...

Page 79: ...rocedure is outlined in Chapter 6 The calibration defaults to the selected bandwidth setting Therefore it is necessary to select the desired bandwidth I or IHBW and turn the LASER output on before per...

Page 80: ...enter a voltage value via the LASer LDV command LASer Cal LdV response 0 means the LDC 3700B Series Laser Diode Controller is not yet ready for the user to enter a LASER voltage value The LASer CAL M...

Page 81: ...while the LASER output is on and when the hardware detects this condition it will turn the LASER output off Therefore the Open Circuit condition is fleeting and may be missed via the LAS COND query T...

Page 82: ...ce current set point is decremented by 0 3 mA LDC 3744B or 0 03 mA LDC 3724B or 0 003 mA LDC 3714B on 50 mA range or 0 006 mA LDC 3714B on 100 mA range LAS MODE I LAS STEP 3 LAS DEC 3 action The laser...

Page 83: ...and sets the laser display to show the laser forward voltage measurement Parameters None Notes The actual LASER V display is turned off automatically when another LASER DISPLAY selection is enabled Ex...

Page 84: ...er DISplay MDP command sets the laser display to show the monitor photodiode power measurement Parameters None Notes The actual LASER PPD display is turned off automatically when another LASER DISPLAY...

Page 85: ...oint of the selected LASER DISPLAY mode Parameters None Notes Using this command has the same effect as physically holding the LASER DISPLAY SET switch down in Examples Las Dis Set action enables the...

Page 86: ...query returns the value of the status condition enable register of the LASER operations The response is the sum of the following 1 LASER Current Limit 256 Output is Shorted 2 LASER Voltage Limit 512 O...

Page 87: ...ble register of the LASER operations Notes The enabled LASER events can be set by using the LASer ENABle EVEnt command The LASER event status can be monitored by the LASer EVEnt query Examples LAS ENA...

Page 88: ...s the value of the status outoff enable register of the LASER operations where the response is the sum of the following Notes The enabled LASER events can be set by using the LASer ENABle OUTOFF comma...

Page 89: ...selected laser control mode set point by one or more steps Optional parameters allow multiple steps to be incremented and the time in milliseconds between increments to be set respectively Parameters...

Page 90: ...nt set point is incremented by three times the amount described in the first example LAS MODE I LAS STEP 3 LAS INC 3 5000 action The laser source current set point is incremented by the amount describ...

Page 91: ...the 2000 mA range on the LDC 3744B Not applicable for LDC 3724B Parameters An nrf value which represents the LASER limit current in mA Notes The current limit is in effect in all modes of operation o...

Page 92: ...it I3 command sets the LASER current limit value for the 4000 mA range on the LDC 3744B Not applicable for LDC 3724B or LDC 3714B This command is for compatibility with programs written for the LDC 37...

Page 93: ...744B Parameters An nrf value which represents the LASER limit current in mA Notes The current limit is in effect in all modes of operation of the laser output with respect to the current output range...

Page 94: ...r laser protection When the maximum operating voltage of a laser is known the user may set the voltage limit to a value slightly higher than the maximum operating voltage Then if the laser is accident...

Page 95: ...every 600 msec Examples Las Mode MDP Las Calmd 0 Las MDi response 100 0 means 100 A of photodetector current This feedback is controlling the laser current output LAS MODE IHBW LAS MDI response 20 0...

Page 96: ...output Las Mode response MDP means that constant P power mode is in effect for the laser output and CALMD 0 Las Mode response MDI means that constant P power mode is in effect for the laser output Las...

Page 97: ...it may be useful to wait until the output is stable within tolerance before performing further operations but it is not necessary When the LASER output is off it is safe to connect or disconnect devi...

Page 98: ...he LASer RANge query returns the value of the Laser Drive Current range Notes The resolution and accuracy of the laser limit current are dependent on the Laser Drive Current output range Examples LAS...

Page 99: ...0 0 mW CALPD 0 Laser Set MDP response 25 0 means the laser monitor PD feedback set point is 25 0 mW CALPD 0 The LASer STEP command is used to increment or decrement the selected laser control mode set...

Page 100: ...A fixed value of 10 mW LDC 3744B or 1 mW LDC 3714B or LDC 3724B is used for PPD power and only the time window parameter may be adjusted If the tolerance is set too tight it may never be achieved Thi...

Page 101: ...tored message This message will always be 16 bytes long and enclosed in quotes The message is entered via the MESsage command Notes The response data will be a 16 byte long string If there is no previ...

Page 102: ...learing of the enable registers PSC 1 Enable automatic power on clearing of the enable registers Action Requests the state of the power on status clear flag Response 0 The enable registers are saved t...

Page 103: ...O This command may be useful for setting up status reporting blocks The bit wise status representation may be more easily read in BIN HEX or OCT Examples RAD dec action the decimal radix is selected r...

Page 104: ...State This is the same state as after OPC no further operations to complete OQIS Operation complete Query Idle State This is the same state as after OPC no further operations to complete These idle st...

Page 105: ...ror message bits are enabled 8 128 136 Action Requests the value in the status byte register Notes Response is the sum of the enabled bits See Chapter Three for more information about register structu...

Page 106: ...Diode Controller will automatically change to ITE mode turn the TEC output on determine its zero current offset set the ITE limit to 4 0 amps and drive the output to 1 0 amps This procedure is outline...

Page 107: ...itch will become enabled and the user should enter the true measured value This procedure is outlined in Chapter 6 The TEC CAL SENsor query may be used to determine if the LDC 3700B Series Laser Diode...

Page 108: ...to determine that the LDC 3700B Series Laser Diode Controller is ready for a value to be entered during the calibration cycle of the TEC CAL V mode Notes This query can be used to poll the LDC 3700B...

Page 109: ...r these values are scaled by the appropriate exponential value for the Steinhart Hart equation Notes If less than three parameters need to be changed only the desired change needs to be specified alon...

Page 110: ...and all of the TEC indicator LEDs will be turned off tec dis 1 action the TEC display and LEDs will be enabled tec display on action the TEC display and LEDs will be enabled The TEC DISplay query retu...

Page 111: ...ays its value The TEC DISplay R command sets the TEC display to show the thermistor resistance AD590 current or LM335 voltage measurement Parameters None Notes The actual TEC R display is turned off a...

Page 112: ...play Tec Dis Set response 1 means the set point value is enabled for the TEC display The TEC DISplay T command enables the TEC display to show the TEC load temperature measurement Parameters None Note...

Page 113: ...COND query returns the value of the status condition enable register of the TEC operations Notes The enabled TEC conditions can be set by using the TEC ENABle COND command The enabled TEC condition s...

Page 114: ...operations Notes The enabled TEC events can be set by using the TEC ENABle EVEnt command The TEC event status can be read and reset by issuing the TEC EVEnt query Examples TEC ENAB EVE response 520 m...

Page 115: ...Change Event bit is set when the power is off the TEC output will not be able to be turned on until this bit is reset Examples TEC ENAB OUTOFF 9 action enables the TEC status outoff register so that a...

Page 116: ...d is issued while the condition status is constantly changing Examples TEC EVE response 513 means that the Output went In or Out of Tolerance and the TE Current Limit events have occurred since the la...

Page 117: ...d value will be stored Examples TEC Gain response 30 0 means the control loop gain is set to 30 Tec GAIN response 100 0 means the control loop gain is set to 100 The TEC ITE command sets the TEC contr...

Page 118: ...on the TEC current limit is set to 3 500 amps Tec Limit Ite 4 0 action the TEC current limit is set to 4 000 amps The TEC LIMit ITE query returns the value of the TEC s TE current limit Notes The ITE...

Page 119: ...control mode Notes The TEC mode is also the parameter which is controlled The TEC output is kept at the set point Examples Tec MODE response ITE means that constant ITE current mode is in effect for t...

Page 120: ...e Parameters None Notes Since TEC load temperature is derived from sensor resistance reference constant R and T modes are related In T mode the set point is converted to resistance or reference using...

Page 121: ...rent to 20 5 A or sets the LM335 voltage to 20 5 mV TEC Mode R TEC R 10 action sets the set point thermistor resistance to 10 0 k or the AD590 current to 10 0 A or the LM335 voltage to 10 0 mV The TEC...

Page 122: ...tes The TEC output is controlled to this set point value only when constant ITE mode is in effect Examples TEC SET ITE response 3 0 means the ITE set point is 3 000 amps Tec Set Ite response 4 0 means...

Page 123: ...sets the TEC temperature set point to 25 3 C The output is controlled to this value if the output is on The TEC T query returns the value of the TEC temperature measurement Notes The measured TEC tem...

Page 124: ...to the calibration of the set point and measurement values Examples Tol 0 5 10 action the LDC 3700B Series Laser Diode Controller s TEC controller will be in tolerance when the temperature is within 0...

Page 125: ...Examples Tec V response 0 2 means the LDC 3700B Series Laser Diode Controller has a TEC voltage of 0 2 volts TEC v response 1 2 means the LDC 3700B Series Laser Diode Controller has a TEC voltage of 1...

Page 126: ...ce the LDC 3700B Series Laser Diode Controller was powered up The TIMER query allows the programmer to determine how much time has passed since the last TIMER query was issued Notes Each time the TIME...

Page 127: ...et the GPIB time out appropriately for use with the WAI command After this command or the Delay command is sent the 3700B may receive up to 20 more commands before the wait period is over If more than...

Page 128: ...rmed around your production schedule night or day seven days a week Please contact ILX Customer Support see page xi for contact information for additional calibration information Calibration Overview...

Page 129: ...tions meet or exceed those listed You must connect various loads and circuits to the outputs of each controller for the calibration procedure A schematic is shown in Figure 5 1 for the photodiode cali...

Page 130: ...the same time The sensor code SENSOR SELECT switch position value displays for 2 seconds After this the TEC display indicates sensor resistance in k Table 5 2 Required Calibration Components LASER CUR...

Page 131: ...e AD590 position the TEC display code is 04 2 Connect a precision 16 8 k metal film resistor and multimeter in series at the sensor input of the Temperature Controller 15 pin connector on the rear pan...

Page 132: ...timeter to measure voltage in mV 3 Enter the TEC sensor calibration mode by pushing the GPIB LOCAL and TEC DISPLAY R switches at the same time The sensor code SENSOR SELECT switch position value will...

Page 133: ...amps Once stable the temperature controller is ready to enter the actual TE current value 4 Press and hold the PARAMETER SET switch and turn the Adjust Knob until the TEC display shows the correct va...

Page 134: ...the LASER I calibration mode by pushing the GPIB LOCAL and LASER DISPLAY I switches at the same time The TEC display will blank and the controller will drive the LASER current output to the set point...

Page 135: ...late the current in the following steps by using Ohm s Law I E R where E is the accurately measured voltage across the resistor and R is the accurately measured load resistance I is the actual pd curr...

Page 136: ...thode on the rear panel of the controller 2 Press the LASER MODE ON switch to turn the LASER output on The LASER output must be on in order to enter the LDV calibration mode 3 Enter the LASER V calibr...

Page 137: ...panel to the 100 A position the TEC display code is 01 2 Using the multimeter measure and record the exact resistance of your metal film resistors A 4 point probe resistance measurement is recommended...

Page 138: ...e LM335 position TEC display code is 03 2 Connect a precision 6 8 k metal film resistor and the multimeter in parallel to the sensor input of the Temperature Controller 15 pin connector on the rear pa...

Page 139: ...e controller drives the TE output current to the negative value of 2 000 Amps 6 Repeat step 5 for the negative polarity of the TEC output current After the negative polarity value of the TEC output is...

Page 140: ...DC 3700B Series Laser Diode Controller They are calibration of the constant current source for both bandwidths and ranges calibration of the laser voltage measurement and calibration of the constant l...

Page 141: ...calibration constants will be calculated and stored into non volatile memory In low bandwidth calibration mode the LDC 3700B Series Laser Diode Controller will also perform current limit calibrations...

Page 142: ...st calibration set point was 4000 A the second set point will be about 1000 A Then it will be ready to receive the second calibration value 6 Input the second actual measured monitor diode current as...

Page 143: ...ady to receive the voltage value when after a LAS CAL LDV query is sent the response from the Controller is 1 5 Once the actual voltage value is entered via the LAS LDV nrf value command the Controlle...

Page 144: ...e monitor photodiode Check also the photodiode bias adjustment on the rear panel If in I or IHBW mode check the current set point and I LIMIT setting Setting the output below the limit may require sev...

Page 145: ...r sensor type Check that C1 and C2 and C3 are correct values for your temperature sensor Check that the GAIN setting is not too low and that the LIM ITE value is not too low for your thermal load Unab...

Page 146: ...o E 099 Internal Program Errors E 100 to E 199 Parser Errors E 200 to E 299 Execution Control Errors E 300 to E 399 GPIB Errors E 400 to E 499 TEC Control Errors E 500 to E 599 LASER Control Errors Ta...

Page 147: ...isabled output E 503 LASER open circuit disabled output E 504 E 505 LASER current limit disabled output LASER voltage limit disabled output E 507 LASER Power limit disabled output E 508 LASER output d...

Page 148: ...120 remote 122 TEC local 115 command separators 41 command reference summary 54 command tree stucture 43 commmand syntax 40 connector GPIB 2 38 LD 13 MOD EXTERNAL 32 TEC 14 34 connectors 6 constant cu...

Page 149: ...32 IPD 20 120 ITE 124 local 39 P 16 20 126 remote 39 T 24 modulation analog 30 N nrf value 41 numeric parameters 44 O OCIS 89 operation complete 47 86 112 OQIS 89 output analog 31 laser 13 19 off regi...

Page 150: ...4 29 34 temperature calibration 115 controller 24 display 24 limits 27 mode 24 sensor 25 specifications 5 terminator string 41 terminators 41 44 thermistor 24 25 thermistor calibration 115 122 timing...

Page 151: ...iv LDC 3700 Series Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 152: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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Summary of Contents for LDC-3700B Series

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ILX Lightwave LDC-3700B Series, User Manual, Page: 95 / 152

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Summary of Contents for LDC-3700B Series

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