THORLABS LDC340 Operation Manual Download Page 78

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5.5 Troubleshooting

LDC340 / Page 72

Adjust the output power (or the output current) with the tuning knob or with the

command

:ILD:SET <NR3>,

:POPT:SET <NR3>

:IMD:SET <NR3>

" depending on the operation mode.

Is the laser diode installed properly?

Control the connection cable.

Is the laser diode polarity set correctly?

If not change the polarity.

Is the photo diode connected properly?

Check the connecting cable.

Is the photo diode polarity set correctly?

If not (negative current on display) change the polarity in the setup field on the front

panel or with the command

:PDPOL CG

:PDPOL AG

Is the correct photo diode efficiency set (A/W)?

Calibrate the diode with the P

potentiometer on the front panel or with the

command

:CALPD:SET <NR3>

Do you have connected a TEC-module but the laser temperature is out of

window?

Disconnect the TED 350

or wait for the laser to reach the window temperature

If you don’t find the error source by means of the trouble shooting list or if

more modules work erratic please first contact the

Thorlabs GmbH – Hotline

([email protected])

before

sending the whole LDC340 system for checkup and

repair to

Thorlabs GmbH

-Germany.

(Refer to section 6.7, “Addresses” on page 83.)

Summary of Contents for LDC340

Page 1: ...Operation Manual Thorlabs Blueline Series Laser diode controller LDC340 IEEE 2006 ...

Page 3: ...g components 15 3 2 1 Pin assignment of the output jack 15 3 2 2 Using the interlock input 16 3 2 3 Connecting the monitor diode 17 3 2 4 Laser voltage measurement 18 3 2 5 Temperature window protection input WIN IN 19 3 3 Display 19 3 4 Main setting knob 20 3 5 Mode Select 20 3 6 Display select 21 3 7 Analog modulation input 21 3 8 Analog output 22 3 9 Setup of polarities and bias voltage 22 3 9 ...

Page 4: ...vice Request Enable Register SRE 38 4 4 10 Query Status Byte Register STB 38 4 5 System command group 39 4 5 1 Answer mode 39 4 5 2 Error LED mode 39 4 5 3 Querying the error queue 40 4 5 4 Oversampling rate 40 4 6 Status command group 41 4 6 1 Query Device Error Condition Register DEC 41 4 6 2 Query Device Error Event Register DEE 41 4 6 3 Device Error Event Enable Register EDE 41 4 7 LDC340 spec...

Page 5: ...atus byte register STB 60 4 9 4 Service request enable register SRE 60 4 9 5 Reading the STB by detecting SRQ 61 4 9 6 Reading the STB by STB command 61 4 9 7 Reading the STB by serial poll 61 4 9 8 Device error condition register DEC 62 4 9 9 Device error event register DEE 63 4 9 10 Device error event enable register EDE 63 4 10 Hints for setting up control programs 64 5 Maintenance and repair 6...

Page 6: ...Thorlabs GmbH This part of the instruction manual contains specific information on how to operate a laser diode controller LDC340 A general description is followed by explanations of how to operate the unit manually You will also find the information about remote control of the LDC340 IEEE via the IEEE 488 computer interface Attention This manual contains WARNINGS and ATTENTION label in this form ...

Page 7: ...t construction Extensive protections for the laser diode The possibility to drive two lasers in series at the same time Two independent monitor diode inputs CW mode with modulation input up to 50 kHz Interlock for automatic switch off by an external control signal e g cooling loop monitoring LabVIEW and LabWindows CVI instrument drivers The laser diodes can be operated in constant current as well ...

Page 8: ...onal use Cable damage monitoring An external emergency switch may be connected Application of external automatic protection equipment e g for the temperature of cooling water ON OFF LED of the laser diode The laser can only be operated with the interlock input being closed Refer to chapter 3 2 2 Using the interlock input starting on page 16 Contact protection of the laser diode open circuit If the...

Page 9: ...ll switch off and after temperature decay of about 10 C the output current of the LDC340 can be switched on again Defined states after switch on When switching on the LDC340 with the mains switch the laser current output is always switched off The LDC340 will always wake up in a mode that can be selected with a DIP switch at the rear Mains filter Protection against line failure or transients Line ...

Page 10: ...se electric shock with damages to your health or even death Also make sure that your line voltage agrees with the voltage indi cated by the switch setting on the back of the unit and that the right fuse has been inserted Only with written consent from Thorlabs GmbH Munich changes to single components may be carried out or components not supplied by Thorlabs GmbH be used This precision device is on...

Page 11: ... strict attention to the safety recommendations of the appropriate laser safety class This laser safety class is marked on your external laser source used Attention Mobile telephones handy phones or other radio transmitters are not to be used within the range of three meters of this unit since the electromagnetic field intensity may then exceed the maximum allowed disturbance values according to E...

Page 12: ...e laser diode mounts for different laser diode packages TCLDM9 Temperature controlled laser diode mount for 3 and 4 pin TO18 packages 9 mm CD 5 6 mm CD LDM21 Miniature sized temperature controlled laser diode mount for 3 and 4 pin TO18 packages 9 mm CD 5 6 mm CD LM14S2 laser diode mount for laser modules in a 14 pin butterfly package programmable pinning Shielded cable CAB400 Cable to connect the ...

Page 13: ...ing country 1 operation manual 1 CD with drivers and software LDC340 IEEE only 1 Connection cable CAB400 2 2 Preparation Prior to starting operating the LDC340 check if the line voltage indicated on the mains voltage selector agrees with your local supply and if the appropriate fuse is inserted To change the line voltage see 5 2 Connect the unit to the line with the provided mains cable Turn the u...

Page 14: ...een remote and local LED Display 4 digit display Mode Select operation mode Adjust Main tuning knob Setup Set diode polarities and bias voltage Display Select the value to be displayed Control Modulation in max 10 V Analog out max 10 V BNC jacks I I Remote Local Mains control switch Modulation Input Analog Output Display Selection Setup Main Setting Knob Laser ON OFF Mode select Display ...

Page 15: ...input IN IEEE 488 Interface jack Mains voltage selector Mains jack with fuse DIP switch for interface configuration DIP switch for wake up preset CP gain Laser diode output PD ext AG 15V 5mA max 1 5 5 3 7 8 6 9 2 4 LED Interl Interl GND LD GND LD C AG LD A CG LD V C LD V A PD GND PD LD OUT CP GAIN 2 3 4 5 7 8 PD int ext or I low hi const I P LD CG AG 1 PD CG AG BIAS off on ILD off on IPD hi low WI...

Page 16: ...external optical build up can be connected to ground potential if required The ground pin of the laser diode is internally connected to chassis ground After switching on the unit the LED display must get visible If no display is shown please check line voltage and line fuse By using the display selection keys you can select the desired value to be displayed at any time The LDC340 is immediately re...

Page 17: ... the LDC340 will wake up when switched on SW1 and SW2 define the mode the LDC340 wakes up Mode SW1 SW2 const current low range up up const current high range down up const power internal PD up down const power external PD down down SW3 defines the polarity of the laser diode LD polarity SW3 CG up AG down SW4 defines the polarity of the monitor diode PD polarity SW4 CG up AG down ...

Page 18: ...iode polarity is set correctly when switching on SW4 must be set correctly If the photodiode is forward biased with a voltage a current will flow through it that could damage or even destroy it SW6 not used SW7 defines if the laser current is switched on automatically if the LDC340 is switched on option laser current SW7 off up auto on down NOTE This is an option that has to be ordered explicitly ...

Page 19: ...LD LIM at the front of the LDC340 The hardware limit is displayed continuously on the display if the display ILD LIM is selected 3 1 3 Setting the limit of the monitor diode current IPD LIM To protect the laser diode the maximum possible optical output power can be limited Therefore a maximum monitor diode current can be set This maximum monitor current is set with the 25 turn potentiometer marked...

Page 20: ... of the optical power is done completely different The CAL potentiometer does not affect the value measured via interface Refer to chapter 4 Communicating with a control computer on page 27 Adjustment During the whole procedure the laser remains switched off First select the operating mode P and the display IPD at the LDC340 Then take the maximum optical output power and the corresponding monitor ...

Page 21: ... 7 laser diode cathode with polarity AG 8 laser diode anode with polarity CG 3 ground for laser diode Monitor diode 2 ground potential for monitor diode 4 monitor diode input Measurement input for laser diode voltage 9 laser diode anode 6 laser diode cathode We recommend to use separate lines drilled in pairs twisted pair in a common shield for laser diode current monitor diode current and laser v...

Page 22: ...e interlock to be open Should the interlock open with the laser switched on there will be an acoustic signal and the laser is switched off immediately It is possible to connect several switches in series to the interlock pins setting up a closed loop that can be opened by each switch Thus different protective functions can be realized simultaneously via the interlock 3 2 2 1 Examples of various pr...

Page 23: ...nterruption of this line will open the interlock Laser ON OFF Display The interlock can also be closed with a red LED with anode to pin 1 and cathode to pin 5 The current is about 7 mA this will make any commercially available LED light up This LED only one LED is allowed may be looped in at any point into the interlock line and may thus serve as an independent ON OFF display 3 2 3 Connecting the ...

Page 24: ... bias voltage of the monitor diode on page 24 3 2 3 2 Connecting an external monitor diode If an external monitor diode is used it must be connected via coaxial cable to the corresponding jack PD ext AG at the rear panel of the LDC340 The external monitor diode input offers no bias voltage and must be connected with grounded anode AG that means the anode connected to the outer shield of the BNC ja...

Page 25: ...t not exceed TTL level 5V max 3 3 Display The display is a 4 digit LED display and shows the value selected in the field marked Display selection continuously Additionally 10 single LED s indicate the unit of the displayed value A mA mW and V and possible errors If the value to be shown is a set value i e the laser current with the output switched off this is indicated with the LED PRESET lighting...

Page 26: ...rrent or optical power are set according to operating mode and status If the laser current is switched off the LED PRESET will light up The set value of the selected parameter is displayed If the laser current is switched on the LED PRESET will remain off The actual value of the selected parameter is displayed 3 5 Mode Select Four modes of operation can be selected by consecutively pressing the mo...

Page 27: ...or diode current IPD EXT NOTE The monitor diode power limit supports the internal and the external monitor diode input The functions of the potentiometers in this field are explained in chapter 3 1 Presettings on page 11 3 7 Analog modulation input The laser diode controller LDC340 has an input for modulating the laser diode current in constant current mode As the internal set value for the laser ...

Page 28: ...utput signal of the LDC340 is limited by the bandwidth and the rise time of the laser output This may lead to deviations in the shape of the signal at the control input compared to that at the control output 3 9 Setup of polarities and bias voltage Three hardware presettings can be selected 3 9 1 Polarity of the Laser diode LD POL The laser diode can either be operated with anode or cathode connec...

Page 29: ...display of the photo current is negative when driving the laser diode above the threshold current In this case you must never switch on the bias voltage 3 9 3 Bias voltage of the monitor diode PD BIAS If required the monitor diode may be driven with a bias voltage of 0 10 V The bias voltage is switched on by pressing the key PD BIAS for about one second Attention Before switching the bias voltage ...

Page 30: ...et a correct limit value of the laser current ILD LIM Set an allowed laser current above the threshold current and switch the laser on Select the display of the monitor current IPD and check the polarity of the display If you see a negative sign the polarity is wrong If you measure a positive value the polarity is right and the bias voltage may be switched on Note For the external monitor diode in...

Page 31: ...ey lights up The laser current cannot be switched on if the interlock loop is not closed the LDC340 is overheated display OTP no laser has been connected or the wiring to the laser is interrupted display LD OPEN when trying to switch on If you try to switch on now a beeper will signal the error Attention Before switching on the laser current first set the laser diode current limit ILD LIM hardware...

Page 32: ...e adapted to the setup This potentiometer will usually be in a 6 o clock position for standard speed If the speed is too high and overshoots occur please turn the potentiometer clockwise to achieve slower settling If you want to have a faster settling please turn the potentiometer counterclockwise Nevertheless the settling time also depends on the set power ...

Page 33: ...nd written in SI units i e A not mA W not mW etc Letters may be written in small or capital letters Attention Before programming a LDC340 IEEE first set the limit value of the laser diode current ILD LIM hardware limit for the applied laser diode with a screwdriver The corresponding potentiometer is marked ADJ and located next to the LED ILD LIM situated at the front of the LDC340 The value ILD LI...

Page 34: ...ck at the rear of the unit The address of the LDC340 must differ from that of other devices at the IEEE488 bus Please refer to chapter 4 2 2 Setting up the Interface starting on page 29 4 2 1 Interface specifications IEEE 488 subsets Function Part set Source Handshake SH1 Acceptor Handshake AH1 Talker T6 Listener L4 Service Request SR1 Remote Local RL1 Parallel Poll PP0 Device Clear DC1 Device Tri...

Page 35: ...to be set according to this table Address SW5 SW4 SW3 SW2 SW1 0 Off Off Off Off Off 1 Off Off Off Off On 2 Off Off Off On Off 3 Off Off Off On On 4 Off Off On Off Off 5 Off Off On Off On 6 Off Off On On Off 7 Off Off On On On 8 Off On Off Off Off 9 Off On Off Off On 10 Off On Off On Off 11 Off On Off On On 12 Off On On Off Off 13 Off On On Off On 14 Off On On On Off 15 Off On On On On continued ne...

Page 36: ...ff 23 On Off On On On 24 On On Off Off Off 25 On On Off Off On 26 On On Off On Off 27 On On Off On On 28 On On On Off Off 29 On On On Off On 30 On On On On On or Off NOTE The device address is valid after switching off and on again String Terminator The string terminator of the LDC340 is preset to LF EOI This is fixed and cannot be changed The LDC340 will accept any combination of LF and EOI as te...

Page 37: ... and the total length of cable should not be more than 20 meters The LDC340 will automatically switch into REMOTE mode after the first character is transferred to it NOTE Programming the control software will vary with the type of computer the user interface the programming language the interface card used as well as with the driver software and the correspondingly supplied software interfaces Ple...

Page 38: ... LabVIEW or LabWindows CVI drivers from Thorlabs GmbH these functions are implemented refer to our homepage http www Thorlabs GmbH com for latest driver updates When receiving the IEEE488 bus commands GET LLO GTL DCL and SDC the LDC340 will execute the following functions LLO Local Lockout The command LLO will disable the button Switching back into LOCAL mode manual operation is only possible with...

Page 39: ...ser unit and the execution unit NOTE The command DCL will set back all units connected to the IEEE488 bus SDC Selected Device Clear The command SCD will clear the input buffer and output queue It will also reset the parser unit and the execution unit NOTE In contrast to the command DCL the command SDC will only set back the devices addressed ...

Page 40: ...essage contains a query command i e a command which requests a response the LDC340 returns a response message Program messages With program messages settings are effected command at the LDC340 and response messages are selected query Program messages can be separated with semicolon All program messages are executed sequentially one after the other Examples MODE CC selecting the mode constant curre...

Page 41: ...value with sign in integer notation Examples 1 or 1 or 22 or 14356789432 Refer to IEEE488 2 1992 standard chapter 8 7 2 Numeric response data Type 2 NR2 Is a numerical value with or without sign in floating point notation without exponent Examples 1 1 or 1 1 or 22 1 or 14356 789432 Refer to IEEE488 2 1992 standard chapter 8 7 3 Numeric response data Type 3 NR3 Is a numerical value with or without ...

Page 42: ...BH LDC340 0 2 17 Description A reply consists of the following sequence Manufacturer Model Serial No Firmware revision 4 4 2 Reset Syntax RST Description All set values will be reset to the default values All outputs will switch off 4 4 3 Self test query Syntax TST Response 0 Description 0 Self test finished with success 4 4 4 Set Operation complete bit Syntax OPC Description The LDC340 will set t...

Page 43: ...ogramming Syntax ESE NR1 Valid Range 0 255 Default Value 0 Description Sets the Event Status Enable Register ESE Reading Syntax ESE Response NR1 Description Queries the Event Status Enable Register ESE and returns the content in decimal notation The content is not modified 4 4 8 Query Standard Event Status Register ESR Syntax ESR Response NR1 Description Queries the Standard Event Status Register ...

Page 44: ...nable Register SRE Reading Syntax SRE Response NR1 Description Queries the Service Request Enable Register ESE and returns the content in decimal notation The content is not modified 4 4 10 Query Status Byte Register STB Syntax STB Response NR1 Description Queries the Status Byte Register STB and returns the content in decimal notation Bit 6 MSS is set to 0 the other bits keep un changed ...

Page 45: ...5 123456E 02 This is not according to the IEEE488 2 standard but useful if you want to increase speed Reading Syntax SYST ANSW Response SYST ANSW FULL SYST ANSW VALUE Description Queries the answer mode 4 5 2 Error LED mode Programming Syntax SYST ERRLED OFF SYST ERRLED ON Default Value OFF Description When switched to ON the LDC340 will switch on the interface ERRor LED as long as there are error...

Page 46: ...se refer to chapter 4 8 Error messages of the LDC340 on page 52 4 5 4 Oversampling rate Programming Syntax SYST OSR NR1 Valid Range 0 7 Default Value 5 Description Sets the LDC340 oversampling rate see table below Reading Syntax SYST OSR Response NR1 Description Queries the oversampling rate Sampling rate Resolution Measurement speed 0 11 Bit sign 18 s 1 12 Bit sign 13 s 2 13 Bit sign 10 s 3 14 Bi...

Page 47: ...ery Device Error Event Register DEE Syntax STAT DEE Response NR1 Description Queries the Device Error Event Register DEE and returns the content in decimal notation The content is cleared 4 6 3 Device Error Event Enable Register EDE Programming Syntax STAT EDE NR1 Valid Range 0 65535 Default Value 0 Description Sets the Device Error Event Enable Register EDE Reading Syntax STAT EDE Response NR1 De...

Page 48: ...aser diode current the photo diode current and the optical power to default values Reading Syntax MODE Response MODE CC MODE CPI MODE CPE Description Queries the mode of operation 4 7 2 Laser diode polarity LDPOL Programming Syntax LDPOL CG LDPOL AG Assumption The laser diode output is switched off Description Switches the laser diode polarity Sets the laser diode current the photo diode current a...

Page 49: ...DPOL AG PDPOL CG Description Queries the polarity of the photo diode 4 7 4 Photo diode range PDRANGE Programming Syntax PDRANGE LOW PDRANGE HIGH Assumption The laser diode output and the bias voltage is switched off Description Switches the photo diode range Sets the laser diode current the photo diode current and the optical power to default values Reading Syntax PDRANGE Response PDRANGE HIGH PDR...

Page 50: ...tax PDBIA Response PDBIA OFF PDBIA ON Description Queries the state of the photo diode bias voltage Attention Before switching the bias voltage on make sure that the photodiode polarity is correct inverse direction If the photodiode is forward biased with a voltage a current will flow through it that could damage or even destroy it For checking the right polarity please refer to chapter 3 9 4 Adju...

Page 51: ...ER OFF LASER ON Description Queries the state of the laser diode output NOTE To switch on the laser while a open circuit error is present see Device Error Condition Register you have to reset the open circuit error with the command LASER OFF With the next command LASER ON the laser will switch on again 4 7 7 Reading the laser diode hardware limit LIMCP Syntax LIMCP ACT Response LIMCP ACT NR3 Descr...

Page 52: ...et current Syntax ILD SET Response ILD SET NR3 Description Queries the programmed laser diode current Unit A Reading the minimum current Syntax ILD MIN Response ILD MIN NR3 Description Queries the minimum allowed laser diode current Unit A Reading the maximum current Syntax ILD MAX Response ILD MAX NR3 Description Queries the maximum allowed laser diode current Unit A Reading the actual current Sy...

Page 53: ...et current Syntax IMD SET Response IMD SET NR3 Description Queries the programmed photo diode current Unit A Reading the minimum current Syntax IMD MIN Response IMD MIN NR3 Description Queries the minimum allowed photo diode current Unit A Reading the maximum current Syntax IMD MAX Response IMD MAX NR3 Description Queries the maximum allowed photo diode current Unit A Reading the actual current Sy...

Page 54: ...yntax CALPD MIN Response CALPD MIN NR3 Description Queries the minimum allowed sensitivity of the monitor diode Unit A W Reading the maximum sensitivity Syntax CALPD MAX Response CALPD MAX NR3 Description Queries the maximum allowed sensitivity of the monitor diode Unit A W NOTE This calibration is used for the command POPT It differs from the calibra tion factor set with the potentiometer located...

Page 55: ... Reading the set power Syntax POPT SET Response POPT SET NR3 Description Queries the programmed optical power Unit W Reading the minimum power Syntax POPT MIN Response POPT MIN NR3 Description Queries the minimum allowed optical power Unit W Reading the maximum power Syntax POPT MAX Response POPT MAX NR3 Description Queries the maximum allowed optical power Unit W Reading the actual power Syntax P...

Page 56: ...TE This queries the optical power measured by the internal monitor diode that is displayed on the 4 digit display 4 7 13 Reading the laser diode voltage VLD Syntax VLD ACT Response VLD ACT NR3 Description Queries the actual laser diode voltage Unit V 4 7 14 Reading the bias voltage VBIAS Syntax VBIAS ACT Response VBIAS ACT NR3 Description Queries the actual photo diode bias voltage Unit V NOTE Thi...

Page 57: ...r diode limit current 4 7 16 Reading the internal photo diode current IPDI Syntax IPDI ACT Response IPDI ACT NR3 Description Queries the actual photo diode current of the internal photo diode Unit A 4 7 17 Reading the external photo diode current IPDE Syntax IPDE ACT Response IPDE ACT NR3 Description Queries the actual photo diode current of the external photo diode Unit A ...

Page 58: ...ue until the error queue is empty refer to 4 5 3 Querying the error queue on page 40 The error queue can keep 32 errors If the queue is empty the error message 0 No error is sent to the PC 4 8 1 General errors 0 No errors Category None Possible reason The error queue is empty 100 Unknown command Category Command Error Possible reason HELLO WORLD This string sent to the LDC340 was not recognized as...

Page 59: ... THL This compound is not valid for this command 190 Parser buffer overflow Category Command Error Possible reason The string sent to the LDC340 was too long for the parser 200 Data out of range Category Execution Error Possible reason ILD SET 10E 30 sent to the LDC340 but this current is much too high 300 Hardware error Category Device Error Possible reason Many Device must probably be maintained...

Page 60: ...le reason Error queue overflow 32 errors max 410 Query interrupted Category Query Error Possible reason More than one query sent to the LDC340 before the read command 420 Query unterminated Category Query Error Possible reason There is no data in the output buffer 500 IEEE488 receive buffer overflow Category Device Error Possible reason The string sent to the LDC340 was too long for the IEEE488 re...

Page 61: ...n Error Possible reason Try to switch on the output while the internal temperature is too high Wait until the LDC340 has cooled down Maintain proper air flow 1005 No LD polarity change during laser on Category Execution Error Possible reason The polarity of the laser diode can not be changed while the laser diode output is switched on 1006 No PD polarity change during laser on Category Execution E...

Page 62: ...be switched on or off during laser on 1013 No PD polarity change during laser on Category Execution Error Possible reason The polarity of the monitor diode may not be changed during laser on 1014 No calibrating of PD during laser on Category Execution Error Possible reason The monitor diode may not be calibrated during laser on 1016 No mode change during laser on Category Execution Error Possible ...

Page 63: ...40 provides four 8 bit registers ESR STB ESE and SRE and three 16 bit registers DEC DEE and EDE to program various service request functions Please refer to the IEEE488 2 1992 standard chapter 11 Figure 4 The status registers DEC DEE and EDE STAT DEC Open Circuit LD ...

Page 64: ...4 9 Status reporting LDC340 Page 58 Figure 5 The status registers ESR ESE STB and SRE Output buffer ERROR Queue or serial poll Service Request Generation ...

Page 65: ...r occurred Request control Not used Operation complete Can be set with OPC The ESR can be read directly with the command ESR This read command clears the ESR The content of the ESR can not be set The bits are active high 4 9 2 Standard event status enable register ESE The bits of the ESE are used to select which bits of the ESR shall influence bit 5 ESB of the STB The 8 bits of the ESE are combine...

Page 66: ... as long as there are errors in the error queue FIN command finished This bit is high after a command has finished and all bits of the STB have been set The STB can be read directly with the command STB The content of the STB can not be set The bits are active high All bits except bit 6 of the STB can be used to assert a service request SRQ Please refer to 4 9 5 Alternatively the SRQ can be recogn...

Page 67: ...he SRQ 4 9 6 Reading the STB by STB command If the controller does not listen to SRQs at all the service request can be detected by reading the status byte with the command STB If bit 6 is logical 1 a service request was asserted 4 9 7 Reading the STB by serial poll If the controller does not listen to SRQs at all the service request can also be detected via serial poll If bit 6 is logical 1 a ser...

Page 68: ...gh Wait until the LDC340 has cooled down Maintain proper air flow 1 Open circuit Cable to the laser diode has opened Compliance voltage not high enough 2 Interlock open Interlock line is open 3 Current limit The current limit is reached and the protection circuit is active now Noise and drift specs are not valid any more 4 Temperature window The temperature module detected a temperature window vio...

Page 69: ...et Reading clears the DEE 4 9 10 Device error event enable register EDE The bits of the EDE are used to select which bits of the DEE shall influence bit 3 DES of the STB The 8 bits of the EDE are related by logical AND to the according 8 bits of the DEE This 8 results are connected by logical OR so that any hit leads to a logical 1 in bit 3 DES of the STB As any bit of the STB can assert an SRQ ev...

Page 70: ...the IEEE488 interface Use this sequences to ensure a fast and secure communication Flowchart for writing device commands Figure 6 Writing device commands Start writing Write command to device ibwrt Poll status byte ibrsp Is FIN bit set No Yes Yes No Is EAV bit set Is FIN bit set No Yes Poll status byte ibrsp Query error queue write SYST ERR to the device Read error message ibrd Yes No Is EAV bit s...

Page 71: ...e 7 Querying device messages Start reading Write query to device ibwrt Poll status byte ibrsp Is FIN bit set No Yes Yes No Is EAV bit set Is FIN bit set No Yes Poll status byte ibrsp Query error queue write SYST ERR to the device Read error message ibrd Yes No Is EAV bit set End Read device message ibrd ...

Page 72: ...and accomplish the data transfer between control computer and LDC340 We recommend to build these write and read back com mands into separate functions and then use these functions for the data transfer In these functions a globally to set flag should be requested that would determine whether the write or read back communication is to be read out together with talker and listener address at IEEE488...

Page 73: ... dampened with water You can use a mild 75 Isopropyl Alcohol solution for more efficient cleaning To guarantee the specifications given in chapter 6 3 over a long period it is recommended to have the unit calibrated by Thorlabs GmbH every two years There are no user serviceable modules inside Any service must only be done by qualified service personnel The LDC340 does not contains any components t...

Page 74: ... opened due to line disturbances incorrectly set voltage or other influences from the outside it can be exchanged at the rear without opening the unit Attention To avoid fire hazard only the appropriate fuse for the corresponding line voltage is to be used 100 V 115 V T4H250V 230 V T2H250V IEC 60127 2 V 5 x 20mm 250 V slow response mains plug with fuse and spare fuse Figure 8 Rear view of the LDC3...

Page 75: ...xchanging the mains fuse Remove the fuse holder completely and exchange the blown fuse We would recommend to check the same time if a replacement fuse is provided and if this fuse is still useable Put the fuse holder back until is has snapped in Execute a function test of the LDC340 by switching it on In case the LDC340 could not be switched on despite the correct fuse being inserted please con ta...

Page 76: ...r remove the two screws that secure the cover to the chassis Remove the unit by sliding it out of the cover With the unit set upright you will find the label depicting names values and positions of internal fuses at the outer wall of the transformer section Replace the defective fuse and reattach the cover T10A250V LDC 340 TED 350 Si3 Si5 Si4 Internal Fuses IEC60127 2 III 5 x 20 mm Si6 Si2 Si1 T1A...

Page 77: ...el of the LDC340 mainframe If blown replace the fuse by the correct type You don t get the desired laser output power Is the interlock closed Control the resistance between the interlock pins of the connector jack not to be more than 430 Ω refer to section 3 2 2 Using the interlock input on page 16 Do you have turned on the laser output Set all necessary parameters and push the LD ON key or use th...

Page 78: ...arity in the setup field on the front panel or with the command PDPOL CG or PDPOL AG Is the correct photo diode efficiency set A W Calibrate the diode with the PLD potentiometer on the front panel or with the command CALPD SET NR3 Do you have connected a TEC module but the laser temperature is out of window Disconnect the TED 350 or wait for the laser to reach the window temperature If you don t f...

Page 79: ...rlabs GmbH warrants the hard and software determined by Thorlabs GmbH for this unit to operate fault free provided that they are handled according to our requirements However Thorlabs GmbH does not warrant a fault free and uninterrupted operation of the unit of the soft or firmware for special applications nor this instruction manual to be error free Thorlabs GmbH is not liable for consequential d...

Page 80: ...Immunity Performance criterion C IEC 61000 4 5 Power Line Surge Immunity Performance criterion C IEC 61000 4 6 Conducted RF Immunity Performance criterion B IEC 61000 4 11 Voltage Dips and Interruptions Immunity Performance criterion C EN 61000 3 2 AC Power Line Harmonic Emissions Complies with the Radiocommunications Act and demonstrated per EMC Emission standard1 2 3 AS NZS 2064 Industrial Scien...

Page 81: ...and laboratory use UL3111 1 Standard for electrical measuring and test equipment U S Nationally Recognized Testing Laboratory Listing ANSI ISA S82 01 1994 Safety standard for electrical and electronic test measuring controlling and related equipment Canadian Certification CAN CSA C22 2 No 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use Additional Comp...

Page 82: ...t operating elements 220 x 110 x 351 mm3 Current control Low range of laser diode current 0 1 A High range of laser diode current 0 4 A Compliance voltage 6 V Setting resolution manual remote control 1 mA 70 µA Measurement resolution manual remote control 1 mA 15 µA Accuracy 4 mA Noise without ripple 10 Hz 10 MHz rms typ 30 µA Ripple 50 60 Hz rms typ 6 µA Transients typ 4 mA Drift 24 hours typ 0 1...

Page 83: ...1 µA Accuracy of photo current 2 2 µA Bias voltage photodiode 2 n a LD Current limit Setting range 0 4 A Measurement resolution manual remote control 1 mA 0 1 mA Accuracy 10 mA PD Current limit Setting range 0 2 mA 10 mA Measurement resolution manual control 0 1 µA 1 µA Measurement resolution remote control 10 nA 100 nA Accuracy 20 µA 200 µA Laser voltage measurement Measurement principle 4 wire M...

Page 84: ... resistance 10 kΩ Output voltage for 0 ILD MAX 0 10 V1 Transmission coefficient 2 5 V A 5 Computer Interface LDC340 IEEE Setting resolution 16 Bit Measurement resolution 12 18 Bit 2 1 sign depends on selected polarity 2 in High Resolution mode at reduced measurement speed ...

Page 85: ... the EC still complete not disassembled and not contaminated As the WEEE directive applies to self contained operational electrical and electronic products this end of life take back service does not refer to other Thorlabs products such as pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards components mechanics and optics left over parts of units...

Page 86: ...cts during decomposition The aim of the European RoHS directive is to reduce the content of toxic substances in electronic products in the future The intent of the WEEE directive is to enforce the recycling of WEEE A controlled recycling of end of live products will thereby avoid negative impacts on the environment Figure 10 Crossed out wheelie bin symbol ...

Page 87: ...ice Error Condition Register DEE Device Error Event Register DES Device Error Summary Bit DIN Deutsche Industrie Norm DIP Dual In line Package EAV Error Available Bit EDE Enable Device Error Event Register EN Europa Norm European Standard EOI End Or Identify ERR ERRor ESE Standard Event Status Enable Register ESR Event Status Register FIN Command FINished Bit GET Group Execute Trigger GTL Go To Lo...

Page 88: ...vice Request Enable Register SRQ Service ReQuest STB STatus Byte Register TEC Thermo Electric Cooler Peltier Element TRG TRiGger 6 6 List of figures Figure 1 Operating elements at the front panel 8 Figure 2 Operating elements at the rear panel 9 Figure 3 Pin assignment of the 9 pin D SUB output jack female 15 Figure 4 The status registers DEC DEE and EDE 57 Figure 5 The status registers ESR ESE ST...

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THORLABS LDC340, Operation Manual

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