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THORLABS ITC502, Operation Manual

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THORLABS ITC502 Operation Manual Download Page 81

 

3.6 ITC5xx specific commands 

 

 

ITC500 / page 73 

 

3.6.5  Switching the bias voltage on and off (PDBIA) 

Programming: 

Syntax:  

":PDBIA OFF"

 

 

":PDBIA ON" 

Assumption:  The laser diode output is switched off. 
Description:  Switches the photo diode bias voltage on or off. 
 

Reading: 

Syntax:  

":PDBIA?"

 

Response:  

[:PDBIA OFF]

 

 

[:PDBIA ON] 

Description:  Queries the state of the photo diode bias voltage. 
 
 

 Attention   

Before switching on the bias voltage make sure that the monitor 

diode polarity is set correctly.  

If the monitor diode is forward biased with a voltage the resulting 

current may damage or even destroy the monitor diode (= the laser 

module).  

 

 

(For checking the right polarity please refer to chapter 2.10, "Adjusting the bias 
voltage of the monitor diode" on page 38) 
 

Summary of Contents for ITC502

Page 1: ...Operation Manual Thorlabs Instrumentation Laser Diode Combi Controller ITC502 IEEE ITC510 IEEE 2006 ...

Page 2: ...Version 2 16 Date 25 07 2006 Copyright 2006 Thorlabs ...

Page 3: ...put 20 1 9 2 Pin assignment of the TEC output jack 22 1 9 3 Connecting a thermistor 23 1 9 4 Connecting a temperature sensor AD590 or AD592 24 1 9 5 Connecting a temperature sensor LM135 or LM335 25 1 9 6 Connecting a TEC element 25 1 9 7 Connecting the status indicator 27 1 9 8 Connecting laser and monitor diode 27 1 9 9 Connecting interlock and status LED 29 1 9 10 Temperature tune input 30 2 Op...

Page 4: ... 2 22 Using the interlock input 52 2 22 1 Examples of various protection functions 53 2 23 Laser voltage measurement 54 3 Remote control by a PC ITC5xx IEEE 55 3 1 IEEE488 Interface 56 3 1 1 Interface specifications 56 3 1 2 Setting up the Interface 57 3 1 3 Connecting the Instrument 59 3 1 4 IEEE488 bus commands 60 3 2 Before Programming 62 3 2 1 Nomenclature 62 3 2 2 Program and response message...

Page 5: ...current ILD 75 3 6 9 Monitor diode current IMD 76 3 6 10 Calibrating a photo diode CALPD 77 3 6 11 Optical power POPT 78 3 6 12 Reading the optical power from the display POPTP 79 3 6 13 Reading the laser diode voltage VLD 79 3 6 14 Reading the bias voltage VBIAS 79 3 6 15 Temperature Sensor SENS 80 3 6 16 Switching the TEC on and off TEC 80 3 6 17 Temperature only AD590 TEMP 81 3 6 18 Resistance ...

Page 6: ...96 3 9 Hints for setting up control programs 97 4 Maintenance 100 4 1 Repair 100 4 2 Cleaning 100 4 3 Selecting the line voltage 100 4 4 Exchanging the line fuse 101 4 5 Trouble shooting 103 5 Service 106 5 1 Exchange of internal fuses 106 6 Appendix 107 6 1 Warranty 107 6 2 Certifications and compliances 108 6 3 Thorlabs End of Life policy WEEE 109 6 3 1 Waste treatment on your own responsibility...

Page 7: ...aring from you Thorlabs This operation manual contains specific information on how to operate the laser diode controller ITC502 and ITC510 A general description is followed by explanations of how to operate the unit manually You will also find informations about remote control via the IEEE 488 computer interface Attention This manual contains WARNINGS and ATTENTION label in this form to indicate d...

Page 8: ......

Page 9: ...fore applying power to your ITC5xx system make sure that the protective conductor of the 3 conductor mains power cord is correctly connected to the protective earth contact of the socket outlet Improper grounding can cause electric shock with damage to your health or even death Also make sure that the line voltage setting marked on the rear panel agrees with your local supply and that the correspo...

Page 10: ... eyes and health Be sure to pay 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 di...

Page 11: ...s Attention The unit must not be operated in explosion endangered environments The user must not open the unit during operation An internal adjustment as well as a replacement of parts is only to be carried out by respectively trained service personnel Parts must not be exchanged when the unit is switched on Dangerous voltages may even be present with the unit off line and the power cord removed ...

Page 12: ...Interlock The interlock input realizes several protective functions simultaneously Safety lock to prevent unintentional 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 duly closed Contac...

Page 13: ...ate device is on Temperature window protection of the laser diode Operation in a specified temperature range Over temperature protection The ITC5xx contains an automatic over temperature protection in case that the allowed internal operating temperature of the ITC5xx should be exceeded In this case the output is turned off After internal temperature drop of about 10 C the output current of the ITC...

Page 14: ...s operates against ground This is of considerable advantage regarding the safety of the TEC element and the stability of the TEC current The sensor input is designed for different types of temperature sensors A missing sensor or the selection of a incorrect type will be detected The ITC5xx has an input for an IC temperature sensor of the AD590 592 or LM35 135 335 series as well as an input for a t...

Page 15: ...titude 3000 m Weight 7 kg Dimensions W x H x D including operating elements 220 x 120 x 376 mm3 without operating elements 220 x 110 x 351 mm3 Current control Range of laser current ILD 0 200 mA Compliance voltage 6 V Setting resolution manual remote control 10 µA 3 µA Measurement resolution manual remote control 10 µA 1 µA Accuracy 100 µA Noise without ripple 10 Hz 10 MHz rms typ 1 5 µA Ripple 50...

Page 16: ...0 200 mA Measurement resolution manual remote control 10 µA 1 µA Accuracy 0 5 mA Analog modulation input Input impedance 10 kΩ Small signal 3 dB bandwidth CC mode DC 500 kHz Laser diode modulation coefficient CC mode 20 mA V 5 Laser diode modulation coefficient CP mode 0 2 mA V 5 Current output TEC element Control range 2 A 2 A Maximum output power 16 W Compliance voltage 8 V Measurement resolutio...

Page 17: ...9 kΩ Setting resolution manual control 1 Ω 10 Ω Setting resolution remote control 0 3 Ω 3 Ω Measurement resolution manual control 1 Ω 10 Ω Measurement resolution remote control 0 1 Ω 1 Ω Accuracy 5 Ω 50 Ω Temperature stability 24 hours 1 0 5 Ω 5 Ω Temperature control input Input resistance 10 kΩ Control voltage 10 10 V Transmission coefficient IC sensors 2 C V 5 Transmission coefficient thermistor...

Page 18: ...tion 16 Bit Measurement resolution 12 18 Bit 1 1 5 2 Technical data ITC510 General Data Line voltage 100 V 115 V 230 V 10 15 fixed Line frequency 50 60 Hz Max power consumption 150 VA Supply mains overvoltage Overvoltage category II Cat II Operating temperature 2 0 40 C Storage temperature 40 C 70 C Relative Humidity Max 80 up to 31 C decreasing to 50 at 40 C Operation altitude 3000 m Pollution De...

Page 19: ...ol Range of monitor current IPD 5 µA 2 mA 1 Setting resolution manual remote control 0 1 µA 0 03 µA Measurement resolution manual remote control 0 1 µA 0 01 µA Accuracy 2 µA Photodiode bias voltage 0 10 V Laser voltage Measurement principle 4 wire Measurement range 0 10 V Measurement resolution manual remote control 1 mV 0 1 mV Accuracy 20 mV Analog control output Load resistance 10 kΩ Output volt...

Page 20: ... mA Measurement accuracy 20 mA Noise and ripple typ 2 mA Measurement resolution TEC voltage manual remote control 1 mV 0 1 mV Measurement accuracy TEC voltage 40 mV TEC Current limit Setting range 0 4 A Measurement resolution manual remote control 1 mA 0 1 mA Accuracy 40 mA Temperature sensors AD590 AD592 LM135 LM335 Control range AD590 LM135 45 C 145 C Control range AD592 25 C 105 C Control range...

Page 21: ... V 2 kΩ V 5 Temperature control Output Load resistance 10 kΩ Output voltage 0 10 V Transmission coefficient thermistor 500 mV kΩ 50 mV kΩ 5 Transmission coefficient IC sensors 50 mV C 5 Temperature window protection Setting range TWIN 0 5 C 20 C Setting range RWIN 20 kΩ 200 kΩ range 50 Ω 2 kΩ 500 Ω 20 kΩ Computer Interface Setting resolution 16 Bit Measurement resolution 12 18 Bit 2 1 Due to the n...

Page 22: ...the front panel Figure 1 Operating elements at the front panel Display Display Sensor Selection Mains control switch ON Standby PID settings Display Selection Main Dial TEC TEC ON OFF Modulation Input Analog Output Setup Main Dial LDC Laser ON OFF Display Selection Remote Control I I ...

Page 23: ...ain DIP switch for wake up preset Figure 2 Operating elements at the rear panel The rear panel of the combi controller ITC5xx contains the mains connector with fuse the output jacks 9 15pin D SUB the analog temperature control output the preset DIP switch bank and the PD gain control potentiometer If the ITC5xx is equipped with the IEEE488 2 there is an additional DIP switch bank to set the IEEE 4...

Page 24: ...C current Check the maximum allowed TEC current in the datasheet of your TEC element Select the display ITEC LIM Change the limit value of the TEC current to the desired value with the screwdriver potentiometer besides the LED ITEC LIM 1 8 3 Setting the temperature window Check the type of temperature sensor in your setup Select this sensor in the field marked SENSOR Decide upon the range of the t...

Page 25: ... wake up mode of the ITC5xx when switched on SW1 selects the default wakeup mode of operation SW1 function up const I down const P You can select between constant current I or constant power P mode SW2 selects the default wakeup laser diode polarity SW2 function up CG down AG SW3 selects the default wakeup photo diode polarity SW3 function up CG down AG ...

Page 26: ...ectly when switching on SW4 must be set correctly If the monitor diode is forward biased with a voltage the resulting current may damage or even destroy the monitor diode the laser module SW5 defines whether the laser diode temperature window protection is on or off indicated by the LED WIN in the field SETUP SW5 function up WIN off down WIN on SW6 defines which potentiometer for the TEC current i...

Page 27: ...1 8 Pre settings ITC500 page 19 down FIX SW7 and SW8 select the default wakeup sensor type SW7 SW8 function up up AD 590 up down AD 590 down up TH 20kΩ down down TH 200kΩ ...

Page 28: ...lock status display 1 output for interlock and status LASER ON OFF 5 digital ground for pin 1 Laser diode 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 1 2 3 4 5 6 7 8 9 ...

Page 29: ...ents ITC500 page 21 We recommend to use separate wires drilled in pairs twisted pair in a common shield for laser diode current monitor diode current and laser voltage measurement respectively The shield has to be grounded ...

Page 30: ...onnector TEC element 5 6 7 TEC element 13 14 15 TEC element ground 2 Voltage detector TEC element 9 Voltage detector TEC element Status indicator 1 Status LED 8 Status LED ground Temperature sensor 3 Thermistor ground 4 Thermistor 10 AD590 592 11 AD590 592 12 Supply voltage for Thorlabs mounts 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ...

Page 31: ...onnected to pin 3 Using a thermistor all temperatures are shown in ohms therefore you have to look for the corresponding temperature in the datasheet of the thermistor Figure 5 Connecting a thermistor When the actual temperature TACT is chosen for display the thermistor resistance is shown The DIP switches SW7 SW8 Figure 2 select the resistance range of the thermistor see 1 8 4 DIP switch for wake...

Page 32: ...ure Select with the display selection keys see Figure 1 the display value TSET to show the set value and set the evaluated resistance value with the TEC main dial knob If the thermistor characteristic R T is given in the data sheet the desired resistance can be read directly 1 9 4 Connecting a temperature sensor AD590 or AD592 An IC temperature sensor of the AD590 family is set up between pin 10 a...

Page 33: ...AD590 as temperature sensor 1 9 6 Connecting a TEC element The plus pole of the TEC must be connected to the pins 5 6 7 the minus pole to the pins 13 14 15 of the jack NOTE Always connect all three pins of the output jack If the voltage of the TEC element is to be measured and displayed as well two additional cables must be connected directly from the two poles of the TEC element to pin 2 and 9 of...

Page 34: ...sor The sensor must have good thermal contact to the active surface of the TEC element Switch on the ITC5xx Now follow the steps described in chapter 1 8 Pre settings on page 16 Select the display TSET and select a suitable temperature resistance Select the display TACT Switch on the output press TEC ON and observe the actual temperature resistance If the temperature TACT is continually running aw...

Page 35: ...ED may be switched between pin 1 and pin 8 The LED will light up if the output for the TEC current has been switched on 1 8 Figure 9 TEC status display Poling and value of the TEC current is insignificant here 1 9 8 Connecting laser and monitor diode Connect laser and monitor diode to the connector jack of the ITC5xx Refer to chapter 1 9 1 Pin assignment for the laser diode output on page 20 When ...

Page 36: ...lose as possible to the laser diode to avoid measurement errors when measuring the monitor diode current In this case the following pin assignment of the output jack will be valid pins in for voltage measurement Figure 10 Connecting laser and monitor diode LD laser diode PD monitor photo diode 6 7 4 6 7 4 9 8 4 9 8 4 LD LD LD LD PD PD PD PD 9 2 PD 3 LD 9 2 PD 3 LD 6 2 PD 3 LD 6 2 PD 3 LD ...

Page 37: ...itted With the contacts open the current module cannot be switched on Should the contact open during operation the output will be switched off immediately Status LED It is also possible to switch a LED with a 0 5 kΩ resistor in parallel between the two pins The LED will light up if the current output is switched on Here are the two possibilities for the pin assignment about 0 5 kΩ 100 Ω Figure 11 ...

Page 38: ...ock the laser temperature The input is a BNC jack at the rear panel above the Sub D laser diode output connector Attention Maximum input voltage of 10 V must not be exceeded The input resistance is10 kΩ and the maximum input voltage is 10 V The sensitivity with an AD590 1 C V with a thermistor 20 kΩ 0 2 kΩ V and with a thermistor 200 kΩ 2 kΩ V ...

Page 39: ...of the current source the set values for laser current monitor current 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 Through the 10 turn set...

Page 40: ...icate errors TEC OPEN lights up if the TEC element has a too high impedance or is not connected WIN lights up if the actual TEC temperature leaves the window OTP lights up if the internal temperature of the LD or the TEC controller is too high Wait until the LED extinguishes Then the ITC5xx can be operated again NO SENSOR lights up if no or a wrong temperature sensor is connected LIMIT lights up i...

Page 41: ...the field DISPLAY Left Display TEC current limit ITEC LIM TEC set temperature TSET TEC current ITEC Temperature window TWIN Actual temperature TACT TEC voltage UTEC Right Display Laser diode current limit ILD LIM Laser diode current ILD Laser diode voltage ULD Internal monitor diode current IPD Optical power measured with the monitor diode PLD Monitor diode bias voltage BIAS ...

Page 42: ...Constant current mode In constant current mode the laser diode current is kept constant Thermal changes in the active zone of the laser will lead to a change of the output power and the central wavelength Attention If in constant current mode the laser is cooled down during operation the efficiency of the laser will increase With some types of lasers this may cause the optical output power to exce...

Page 43: ...not entail a change of the output power however a change of the central wavelength Attention Should in constant power mode some lasers fail in a laser bar or laser stack a laser current runaway may happen without being recognized leading to more and more destruction in the laser pile Therefore we urgently recommend to set the limit value for the laser current carefully NOTE For constant power mode...

Page 44: ...ght pins of the output jack you also have to select the right polarity with the button PD POL in the field SETUP at the front panel If the polarity has been chosen correctly the display of the photo current is positive If the chosen polarity is wrong the 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 ...

Page 45: ...nded with bias voltage CG Toggling values follows always this order If the wake up default is AG the setting after pressing PD POL once will be AG BIAS If the wake up default is AG BIAS the setting after pressing PD POL once will be CG etc Attention Before switching on the bias voltage make sure that the monitor diode polarity is set correctly If the monitor diode is forward biased with a voltage ...

Page 46: ...gn the polarity is wrong If you measure a positive value the polarity is right and the bias voltage may be adjusted to the desired value 2 11 Adjusting the power display of an internal monitor diode The optical power can be displayed if PLD is selected for display Therefore the monitor current is transferred into a power display that can be calibrated with the 25 turn potentiometer marked ADJ loca...

Page 47: ...IPD at the ITC5xx Take the nominal optical output power and the corresponding monitor current from the datasheet of the laser diode Set the preset value for the monitor current to this value Switch to the display PLD so that the power belonging to the set monitor diode is shown Use the potentiometer ADJ next to the LED PLD to adjust this display to the corresponding value of the output power ...

Page 48: ...rotection is activated Refer to chapter 1 8 4 DIP switch for wake up preset starting on page 17 The control LED in the display lights if the TEC temperature moves out off the specified window regardless if the window protection is active or not If the temperature window protection is switched on the laser diode will be switched off if the temperature leaves the window 2 13 Selecting the temperatur...

Page 49: ...s TEC ON and observe the actual temperature resistance If the temperature TACT is continually running away from TSET The TEC element is reversed poled Change polarity and repeat the procedure If TACT is oscillating around the value TSET the TEC element has been connected correctly however the values for the P I and D share of the control loop are still incorrect Refer to chapter 2 15 4 PID adjustm...

Page 50: ...eat conductor connecting the component to the source sink copper alu A propulsion to lead the flow of temperature TEC element laser sensor copper bloc TEC element heat sink Figure 12 Typical thermal set up of a diode laser 2 15 1 Statements and implications The temperature of the laser can be measured with the sensor In the copper bloc is a heat flow between laser and TEC element In the TEC elemen...

Page 51: ...ences on the real temperature control loop To 1 Offset and gain errors of the sensor will only allow a relative knowledge about the laser temperature The sensor will never be fixed to the laser chip in such a way that it will exclusively measure its temperature So the temperature in the copper bloc being inhomogeneous due to the heat flow will be measured as well Even within the laser chip the tem...

Page 52: ...tting a new temperature is limited since the heat transport in the copper bloc is relatively slow Furthermore the temperature slope in the copper must form anew The sensor which also possesses a significant heat capacity must settle to the laser temperature Possibility of optimization PID adjustment ...

Page 53: ...clock 2 Switch on the output button TEC ON and observe the actual temperature In some cases it is useful to connect a storage oscilloscope to the TEMP OUT output 2 15 4 2 P share 3 Change the set temperature repeatedly between values of ambient temperature 2 C and ambient temperature 2 C and observe the settling behavior of the actual temperature Increase the P share gradually by turning the corre...

Page 54: ...ershoots The D share has been set correctly when the actual temperature remains stable near the set temperature after a minimum of overshoots 2 15 4 4 I share 5 Change the set temperature repeatedly between values of ambient temperature 2 C and ambient temperature 2 C and observe the settling behavior of the actual temperature Increase the I share gradually by turning the corresponding potentiomet...

Page 55: ...This procedure should only be done by qualified service personnel Hazardous voltages exist within the device As shipped from the factory all parts carrying line voltage are covered to reduce the likelihood of contact Use only isolated tools and be careful not to touch any Mains Pull the line plug Remove the cover of the ITC5xx Set jumper JP8 on the mainboard Adjust the P and D share as usual Remov...

Page 56: ...se note that this DC current and the modulation current are added so you will use a modulation voltage without a DC share The modulation coefficient is version dependent See chapter 1 5 Technical Data starting on page 7 As modulation source you can use any commercially available function generator or any signal source with output voltage in the specific range NOTE Over modulation is defined as pro...

Page 57: ...replica of the laser current Possible deviations of the control output from control input are due to limited bandwidth and rise time of the laser output The transmission coefficient of this output depends on the type of ITC5xx 10 V correspond to the maximum output current so e g for a 1 A ITC510 10 V correspond to 1 A and the transmission coefficient is 10V 1A 10 V A Respectively for LD polarity A...

Page 58: ... not closed the ITC5xx 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 the temperature window protection is activated and the temperature is outside the window Please refer to chapter 2 12 Temperature window protection on page 40 The TEC current cannot be switched on if no or a wrong temperature sensor is conn...

Page 59: ... connector TEMP OUT An analog output TEMP OUT is provided at the rear of the ITC5xx Here a voltage proportional to the actual temperature TACT is applied for monitoring purposes e g to supervise the settling behavior of the temperature control loop voltage range sensor 0 10 V 0 20 kΩ thermistor 0 10 V 0 200 kΩ thermistor 2 5 V 7 5 V 45 C 145 C AD590 LM335 External devices to supervise the operatio...

Page 60: ...re pin 1 and pin 5 of the 9pin D SUB jack respectively pin 6 and pin 15 of the 15pin HD jack at the rear of the unit If the connection is open Interlock loop open the laser cannot be switched on Furthermore if the interlock is open a red LED INTERLOCK on the front panel of the ITC5xx will light If the interlock open s with the laser on there will be an acoustic signal and the laser is switched off...

Page 61: ...er e g the temperature of the cooling water A suitable setup offers a switch that will open in case of an error If only a certain temperature range is to be monitored a suitable fast thermo switch can be used This switch opener is connected between the two pins of the interlock Please see also chapter 2 12 Temperature window protection on page 40 2 22 1 3 Safety door monitoring If the laser is to ...

Page 62: ...ght 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 2 23 Laser voltage measurement The ITC5xx constantly measures the laser voltage at the output jacks of the unit For a precise measurement connect pin 6 directly to the LD cathode and pin 9 directly to the LD anode respectively pin 11 and pin 14 to avoid ...

Page 63: ... written in SI units i e A not mA W not mW etc Letters may be small or capital letters Attention Before programming an ITC5xx 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 ITC5xx The value ILD LIM is constantly m...

Page 64: ... IEEE488 jack at the rear of the unit The address of the ITC5xx must differ from that of other devices on the IEEE488 bus Please refer to chapter 3 1 2 Setting up the Interface starting on page 57 3 1 1 Interface specifications 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 Trigger D...

Page 65: ...o 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 nex...

Page 66: ...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 ITC5xx is preset to LF EOI This is fixed and cannot be changed The ITC5xx will accept any combination of LF and EOI as strin...

Page 67: ...s and the total cable length should not be more than 20 meters The ITC5xx will automatically enter REMOTE mode after the first character is transferred to the ITC5xx 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 68: ...itly produced in the control program Also in the LabVIEW or LabWindows CVI drivers from Thorlabs these functions are implemented When receiving the IEEE488 bus commands GET LLO GTL DCL and SDC the ITC5xx will execute the following functions LLO Local Lockout The command LLO will disable the button Return to LOCAL mode manual operation will only be possible with the command GTL see below GTL Go To ...

Page 69: ...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 SDC 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 device addressed ...

Page 70: ... If a program message contains a query command i e a command which requests a response the ITC5xx returns a response message Program messages With program messages settings are effected command at the ITC5xx and response messages are selected query Program messages can be separated with semicolon All program messages are executed sequentially one by one Examples MODE CC select the mode constant cu...

Page 71: ... A125TG or A1 23456A Refer to IEEE488 2 1992 standard chapter 8 7 1 Numeric response data Type 1 NR1 Is a numerical 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 1or 1 1 or 22 1 or 14356 789432 Re...

Page 72: ...e 64 Numeric response data Type 3 NR3 Is a numerical value with or without sign in floating point notation with exponent with sign Examples 1 1E 1 or 1 1E 1 or 22 1E 1 or 143 56789432E 306 Refer to IEEE488 2 1992 standard chapter 8 7 4 ...

Page 73: ...Response PROFILE ITC510 0 2 17 Description A reply consists of the following sequence Manufacturer Model Serial No Firmware version 3 3 2 Reset Syntax RST Description All outputs are switched off All values are set to default 3 3 3 Self test query Syntax TST Response 0 Description 0 Self test finished 3 3 4 Set Operation complete bit Syntax OPC Description The ITC5xx will set the OPC bit in the St...

Page 74: ...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 3 3 8 Query Standard Event Status Register ESR Syntax ESR Response NR1 Description Queries the Standard Event Status Register ...

Page 75: ...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 3 3 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 unchanged ...

Page 76: ...ACT 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 3 4 2 Error LED mode Programming Syntax SYST ERRLED OFF default SYST ERRLED ON Default Value OFF Description When ON the ITC5xx will switch on the interface ERRor LED as long as there are error...

Page 77: ...refer to chapter 3 7 Error messages of the ITC5xx starting on page 84 3 4 4 Averaging rate Programming Syntax SYST OSR NR1 Valid Range 0 7 Default Value 5 Description Sets the ITC5xx averaging rate see table below Reading Syntax SYST OSR Response NR1 Description Queries the averaging 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 Bit s...

Page 78: ...Device Error Event Register DEE Syntax STAT DEE Response STAT DEE NR1 Description Queries the Device Error Event Register DEE and returns the content in decimal notation The content is cleared 3 5 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 S...

Page 79: ...d the optical power to default values Reading Syntax MODE Response MODE CC MODE CP Description Queries the mode of operation 3 6 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 and the optical power to default values Reading Syntax L...

Page 80: ...Description Selects the photo diode polarity Sets the laser diode current the photo diode current and the optical power to default values Reading Syntax PDPOL Response PDPOL AG PDPOL CG Description Queries the polarity of the photo diode 3 6 4 Reading the state of the temperature protection TP Syntax TP Response TP OFF TP ON Description Queries the state of the temperature protection ...

Page 81: ...PDBIA Response PDBIA OFF PDBIA ON Description Queries the state of the photo diode bias voltage Attention Before switching on the bias voltage make sure that the monitor diode polarity is set correctly If the monitor diode is forward biased with a voltage the resulting current may damage or even destroy the monitor diode the laser module For checking the right polarity please refer to chapter 2 10...

Page 82: ... open circuit over temperature Description Switches the laser diode output on or off Reading Syntax LASER Response LASER 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 ON With the next command LASER ON the laser ...

Page 83: ... Assumption The operation mode is switched to constant current Description Sets the laser diode current Unit A Reading the set 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 I...

Page 84: ...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 Synta...

Page 85: ... Syntax 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 calibration factor set with the potentiometer locate...

Page 86: ...ading 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 POPT...

Page 87: ...TE This queries the optical power measured by the internal monitor diode that is displayed on the 4 digit display 3 6 13 Reading the laser diode voltage VLD Syntax VLD ACT Response VLD ACT NR3 Description Queries the actual laser diode voltage Unit V 3 6 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 88: ...grammed temperature resistance to default values Reading Syntax SENS Response SENS AD SENS THL SENS THH Description Queries the type of the temperature sensor 3 6 16 Switching the TEC on and off TEC Programming Syntax TEC OFF TEC ON Default Value OFF Assumption To switch the TEC on there must be no device errors no sensor TEC open over temperature Description Switches the TEC output on or off Read...

Page 89: ...0 Description Queries the programmed temperature Unit C Reading the minimum temperature Syntax TEMP MIN Response TEMP MIN NR3 Assumption The temperature sensor is set to AD590 Description Queries the minimum allowed temperature Unit C Reading the maximum temperature Syntax TEMP MAX Response TEMP MAX NR3 Assumption The temperature sensor is set to AD590 Description Queries the maximum allowed tempe...

Page 90: ...gh or low range Description Queries the programmed thermistor resistance Unit Ω Reading the minimum resistance Syntax RESI MIN Response RESI MIN NR3 Assumption The temperature sensor is set to thermistor high or low range Description Queries the minimum allowed thermistor resistance Unit Ω Reading the maximum resistance Syntax RESI MAX Response RESI MAX NR3 Assumption The temperature sensor is set...

Page 91: ...eading the TEC current ITE Syntax ITE ACT Response ITE ACT NR3 Description Queries the actual TEC current Unit A 3 6 21 Reading the temperature resistance window WIN Syntax WIN ACT Response WIN ACT NR3 Description Queries the actual temperature resistance window Depending on the temperature sensor the temperature window or the resistance window is retuned Unit C Ω 3 6 22 Reading the TEC voltage VT...

Page 92: ...il the error queue is empty refer to 3 4 3 Querying the error queue on page 69 The error queue can keep 32 errors If the queue is empty the error message 0 No error is sent to the PC 3 7 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 ITC5xx was not recognized as valid...

Page 93: ...ASER CG This compound is not valid for this command 190 Parser buffer overflow Category Command Error Possible reason The string sent to the ITC5xx was too long for the parser 200 Data out of range Category Execution Error Possible reason ILD SET 10E 30 sent to the ITC5xx but this current is much too high 300 Hardware error Category Device Error Possible reason Many Device must probably be maintai...

Page 94: ...ason Error queue overflow 32 errors max 410 Query interrupted Category Query Error Possible reason More than one query sent to the ITC5xx 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 ITC5xx was too long for the IEEE488 receive...

Page 95: ...rature Category Execution Error Possible reason Try to switch on the output while the internal temperature is too high Wait until the ITC5xx has cooled down Maintain proper air flow 1304 Internal power failure Category Execution Error Possible reason Try to switch on the output while an internal power failure occurred 1306 No calibrating of PD during laser on Category Execution Error Possible reas...

Page 96: ...ion Error Possible reason The polarity of the monitor diode can not be changed during the laser diode output switched on 1311 No mode change during laser on Category Execution Error Possible reason The operating mode CC or CP cannot be changed during the laser diode output is switched on 1312 Wrong or no sensor Category Execution Error Possible reason The ITC5xx detected no sensor at the output ja...

Page 97: ... temperature resistance reached Category Execution Error Possible reason The set value of the temperature resistance reached the temperature limit 1318 No bias change during laser on Category Execution Error Possible reason The bias voltage may not be switched on or off during laser on 1319 No PD polarity change during bias on Category Execution Error Possible reason The polarity of the monitor di...

Page 98: ...standard events Power on This event bit indicates that an off to on transition has occurred in the power supply So it is high after switching on the device for the first time User request Not used Command error A command error occurred Execution error An execution error occurred Device error A device dependent error occurred Query error A query error occurred Request control Not used Operation com...

Page 99: ...3 8 Status reporting ITC500 page 91 Figure 13 ITC5xx Status registers ESR ESE STB and SRE Output buffer ERROR Queue or serial poll Service Request Generation ...

Page 100: ...ng ITC500 page 92 Figure 14 ITC5xx Status registers DEC DEE and EDE STAT DEC Power supply error No or wrong sensor Open Circuit TEC Temperature out of window Current limit Interlock open Open circuit LD Over temperature ...

Page 101: ...of the ITC5xx RQS RQS Request service message Shows that this device has asserted SRQ red via serial poll MSS Master summary status Shows that this device requests a service read via STB MAV message available This bit is high after a query request as a result waits in the output queue to be fetched It is low if the output queue is empty DES device error status This bit is high after a device error...

Page 102: ... logical OR so that any hit leads to a logical 1 in bit 6 of the STB and asserts an SRQ 3 8 5 Reading the STB by detecting SRQ If an SRQ is asserted see 3 8 4 bit 6 of the STB is set to logical 1 so that the controller can detect by auto serial polling which device asserted the SRQ 3 8 6 Reading the STB by STB command If the controller does not listen to SRQs at all the service request can be dete...

Page 103: ...e 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 violation 5 Open circuit The TEC element to has a too high resistance or is not present ...

Page 104: ...t Reading clears the DEE 3 8 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 eve...

Page 105: ...E488 interface Use these sequences to ensure fast and secure communication Flowchart for writing device commands Figure 15 Flowchart for 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 EA...

Page 106: ...wchart for reading 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 107: ...nto the programming text and accomplish the data transfer between control computer and ITC5xx We recommend to build these write and read back commands into separate functions and then use these functions for the data transfer In these functions a globally set flag should be requested that would determine whether the write or read back communication is to be read out together with talker and listen...

Page 108: ...are to avoid scratching the clear plastic display filter 2 Use a soft cloth dampened with water to clean the instrument Use an aqueous solution of 75 isopropyl alcohol for more efficient cleaning Attention To avoid damage to the surface of the instrument do not use any abrasive or chemical cleaning agents To maintain the specifications for a long period of time we recommend to have the unit re cal...

Page 109: ...er 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 must be used ITC502 and ITC510 100V 115V T4H250V 230V T2H250V IEC 60127 2 V 5 x 20mm 250V slow response mains plug with fuse and spare fuse Figure 17 Rear view of the ITC5xx TEMP OUT AUX ...

Page 110: ...use is located at the rear part of the drawer Figure 18 ITC5xx fuse holder Remove the fuse holder completely and exchange the defective fuse We recommend to check the same time if a replacement fuse is provided and if this fuse is still useable Push the fuse holder back until is has snapped in Execute a function test of the ITC5xx by switching it on In case the ITC5xx could not be switched on desp...

Page 111: ...on 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 1 9 9 Connecting interlock and status LED on page29 Do you have turned on the laser output Change the status setting from off to on either manually or by the remote command LASER ON The LED ON on the front panel of the un...

Page 112: ...o element mode Is the desired output power programmed correctly Turn to constant power mode and adjust the desired output power PLD with the tuning knob or with the POPT SET NR3 command Is the ITC5xx running in temperature protection mode Check if the temperature window is set correctly Check if the laser temperature is out of window laser is then switched off automatically You don t get the desir...

Page 113: ...e SENS AD THL THH command Enter the right set value for resistance manually or by the RESI SET NR3 command Is the TEC hardware current limit set to 0 Adjust it with the ITEC LIM potentiometer to an appropriate value Set temperature differs from actual temperature of the laser Is the temperature not stable Adjust the corresponding PID parameters carefully refer to 2 15 4 PID adjustment on page 45 I...

Page 114: ...nect the power cord from the mains power With the ITC5xx turned over 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 ITC 5xx Si3 Si5 ...

Page 115: ... to Thorlabs Thorlabs warrants the hardware and software determined by Thorlabs for this unit to operate without fault provided that they are handled according to our statements However Thorlabs does not warrant a fault free and uninterrupted operation of the unit of the software or firmware for special purposes nor this instruction manual to be fault free We will not carry responsibility for ensu...

Page 116: ... Performance criterion C 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 Scientific and Medical Equipment 1992 Australia New Zealand Declaration of Conformity EMC FCC EMC Compliance Emissions comply with the Cl...

Page 117: ...ded product 6 3 Thorlabs End of Life policy WEEE As required by the WEEE Waste Electrical and Electronic Equipment Directive of the European Community and the corresponding national laws Thorlabs offers all end users in the EC the possibility to return end of life units without incurring disposal charges This offer is valid for Thorlabs electrical and electronic equipment sold after August 13th 20...

Page 118: ...ry Do not dispose of the unit in a litter bin or at a public waste disposal site 6 3 2 Ecological background It is well known that WEEE pollutes the environment by releasing toxic products 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 ...

Page 119: ...ce Error Condition Register DEE Device Error Event Register DES Device Error Status DIP Dual In line Package DUT Device Under Test EAV Error AVailable EDE Enable Device Error Event Register EOI End Of Information ERR ERRor ESE Standard Event Status Enable register ESR Event Status Register FIN Command FINished GET Group Execute Trigger GTL Go To Local GPIB General Purpose Interface Bus IC Integrat...

Page 120: ...e MSS Master Summary Status OTP Over TemPerature PC Personal Computer PD Photo Diode PID Proportional Integral Differential regulator P Share Proportional share RF Radio Frequency RMS Root Mean Squared RQS ReQuest Service Message SDC Selected Device Clear SEL SELect SRE Service Request Enable Register SRQ Service ReQuest STB STatus Byte Register SW Soft Ware TEC ThermoElectric Cooler Peltier Eleme...

Page 121: ... LM135 or LM335 25 Figure 8 Connecting a TEC 26 Figure 9 TEC status display 27 Figure 10 Connecting laser and monitor diode 28 Figure 11 Interlock and status LED 29 Figure 12 Typical thermal set up of a diode laser 42 Figure 13 ITC5xx Status registers ESR ESE STB and SRE 91 Figure 14 ITC5xx Status registers DEC DEE and EDE 92 Figure 15 Flowchart for writing device commands 97 Figure 16 Flowchart f...

Page 122: ...s GmbH Gauss Strasse 11 D 85757 Karlsfeld Germany Sales and Support Phone 49 0 81 31 5956 0 Fax 49 0 81 31 5956 99 Email europe thorlabs com Web www thorlabs com USA Thorlabs Inc 435 Route 206 North Newton NJ 07860 USA Sales and Support Phone 1 973 579 7227 Fax 1 973 300 3600 Email sales thorlabs com Email techsupport thorlabs com Web www thorlabs com ...

Page 123: ...uilding 5 17 1 Ohtsuka Bunkyo ku Tokyo 112 0012 Japan Sales and Support Phone 81 3 5977 8401 Fax 81 3 5977 8402 Email sales thorlabs jp Web www thorlabs jp Please call our hotlines send an Email to ask for your nearest distributor or just visit our homepage http www thorlabs com ...

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