THORLABS LDC340 Operation Manual
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THORLABS LDC340 Operation Manual

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Operation Manual
Thorlabs Blueline™ Series
Laser diode controller
LDC340 (-IEEE)
2006

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Summary of Contents for THORLABS LDC340

  • Page 1 Operation Manual Thorlabs Blueline™ Series Laser diode controller LDC340 (-IEEE) 2006...
  • Page 2 Version: 2.23 Date: 20.06.2006 © Copyright 2006, Thorlabs GmbH, Germany...

  • Page 3: Table Of Contents

    Polarity of the internal monitor diode (PD POL) 3.9.3 Bias voltage of the monitor diode (PD BIAS) 3.9.4 Adjusting the bias voltage of the monitor diode 3.10 Laser current ON/OFF (LD ON) 3.11 CP gain Communicating with a control computer (LDC340-IEEE) 4.1 General remarks...
  • Page 4 Oversampling rate 4.6 Status command group 4.6.1 Query Device-Error-Condition-Register (DEC) 4.6.2 Query Device-Error-Event-Register (DEE) 4.6.3 Device-Error-Event-Enable-Register (EDE) 4.7 LDC340 specific commands 4.7.1 Operation mode (MODE) 4.7.2 Laser diode polarity (LDPOL) 4.7.3 Photo diode polarity (PDPOL) 4.7.4 Photo diode range (PDRANGE) 4.7.5...
  • Page 5 4.7.14 Reading the bias voltage (VBIAS) 4.7.15 Reading the monitor diode limit current (LIMMP) 4.7.16 Reading the internal photo diode current (IPDI) 4.7.17 Reading the external photo diode current (IPDE) 4.8 Error messages of the LDC340-IEEE 4.8.1 General errors 4.8.2 LDC340 operation error messages 4.9 Status reporting...
  • Page 6 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.

  • Page 7: General Information

    1.1 At a Glance 1 General Information 1.1 At a Glance The LDC340 is a compact laser driver with optional IEEE488.2 interface for driving laser diodes up to 4A laser current. The LDC340 especially excels in: • Very low noise •...
  • Page 8 With the current module switched off an electronic switch will shortcircuit the laser diode so that no voltage is applied to the laser contacts. • Control LED for laser current being active When the laser current is switched on an LED in the switch LD ON lights up. LDC340 / Page 2...
  • Page 9 Protection against line failure or transients. • Line failure monitoring In case of line failure/line interruption the LDC340 will wake up anew as if it has been switched on. So the laser output remains switched off. LDC340 / Page 3...

  • Page 10: Safety

    Before applying power to your LDC340 system, make sure that the protective conductor of the 3 conductor mains power cord is cor- rectly connected to the protective earth contact of the socket outlet!
  • Page 11 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 EN 50 082-1. LDC340 / Page 5...

  • Page 12: Ordering Codes And Accessories

    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 laser diode controller LDC340 to a Laser Diode Mount LDC340 / Page 6...

  • Page 13: Getting Started

    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.

  • Page 14: Operating Elements

    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 LDC340 / Page 8...

  • Page 15: Rear Panel

    (BNC) as well as the preset DIP switch bank and the PD gain control potentiometer. If the LDC340 is equipped with the IEEE488.2 interface ( LDC340-IEEE) there is an additional DIP switch bank to set the IEEE 488 device address. You will also find the 24pin IEEE488 jack.

  • Page 16: First Operation

    By using the display selection keys you can select the desired value to be displayed at any time. The LDC340 is immediately ready to use after turning on. The rated accuracy is reached, however, after a warming-up time of approx. 10 minutes.

  • Page 17: Operating The Ldc340

    3.1 Presettings 3.1.1 DIP switch for “wake up“ preset By means of these 8 switches several preset functions define in which mode the LDC340 will wake up when switched on. SW1 and SW2 define the mode the LDC340 wakes up: Mode const.
  • Page 18 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...

  • Page 19: Setting The Limit Of The Laser Current I

    3.1.2 Setting the limit of the laser current I LD LIM To protect the laser diode the maximum possible current at the output of the LDC340 can be limited. This hardware limit is set by the 25-turn potentiometer marked ADJ located next to the LED I at the front of the LDC340.

  • Page 20: Adjusting The Power Display Of An Internal Monitor Diode

    NOTE This is the description of how to calibrate the power display in local mode using the display of the LDC340. When using the IEEE488 interface the calibration of the optical power is done completely different. The CAL potentiometer does not affect the value measured via interface.

  • Page 21: Connecting Components

    We recommend to use separate lines drilled in pairs (twisted pair) in a common shield for laser diode current, monitor diode current and laser voltage measurement respectively. The shield must be connected to ground (pin 3). LDC340 / Page 15...

  • Page 22: Using The Interlock Input

    These are pin 1 and pin 5 of the 9 pin D-SUB jack at the rear of the unit. If the two pins are not connected (Interlock loop open) the laser cannot be switched Furthermore a red LED "INTERLOCK" on the front panel of the LDC340 will indicate the interlock to be open.

  • Page 23: Connecting The Monitor Diode

    (input impedance 0 Ω). The two pins are floating i.e. they are not in direct connection to the laser diode ground. The common voltage against ground must not exceed ± 5 V. It is allowed to connect any pin of the monitor diode to the laser diode ground. LDC340 / Page 17...

  • Page 24: Laser Voltage Measurement

    Input voltage / current must not exceed 15V / 5mA! 3.2.4 Laser voltage measurement The LDC340 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 to avoid measuring the voltage drop in the connection lines (4 pole measurement).

  • Page 25: Temperature Window Protection Input (Win In)

    (pin 3). 3.2.5 Temperature window protection input (WIN IN) If you use the LDC340 together with a temperature controller you can use the temperature window input (WIN IN) to switch off the laser current, if the temperature leaves a predefined window.

  • Page 26: Main Setting Knob

    TED 350 connected to the LDC340 via BNC cable protects the laser from being switched lights up if the internal temperature of the LDC340 is too high. Please wait until the LED extinguishes. Then the LDC340 can be operated again.

  • Page 27: Display Select

    “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 diode current is modulated all laser protections remain active (!).

  • Page 28: Analog Output

    V correspond to 4A thus the transmission coefficient is 10 V / 4 A = 2.5 V/A. The shape of the output 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.

  • Page 29: Polarity Of The Internal Monitor Diode (Pd Pol)

    If the photodiode is forward biased with a voltage a current will flow through it that could damage or even destroy it. NOTE To protect the monitor diode from accidental biasing the, switch PD BIAS must be pressed for about 1 second to switch on the bias voltage. LDC340 / Page 23...

  • Page 30: Adjusting The Bias Voltage Of The Monitor Diode

    If you use a monitor diode with reverse polarity at this input (not AG) you will • measure a negative monitor current I • still display a positive optical power P • not be able to operate in constant power mode LDC340 / Page 24...

  • Page 31: Laser Current On/Off (Ld On)

    3.10 Laser current ON/OFF (LD ON) 3.10 Laser current ON/OFF (LD ON) The laser current can be switched on by pressing the key LD ON. When the LDC340 is switched on with the mains switch this switch is always in position OFF to prevent the laser to be activated mistakenly.

  • Page 32: Cp Gain

    3.11 CP gain 3.11 CP gain With this potentiometer at the back panel of the LDC340 the speed of the regulation loop in constant power mode can be adapted to the setup. This potentiometer will usually be in a 6 o’clock position for standard speed.

  • Page 33: Communicating With A Control Computer (Ldc340-Ieee)

    All analog values are read and 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 I (hardware limit) for the applied laser diode LD LIM with a screwdriver.

  • Page 34: Ieee488 Interface

    The IEEE488 interface of the LDC340 is based on the IEEE488.2 standard. This includes the IEEE488.1 standard for the hardware settings. There is a standard 24- pin IEEE488 jack at the rear of the unit. The address of the LDC340 must differ from that of other devices at the IEEE488 bus.

  • Page 35: Setting Up The Interface

    4.2.2 Setting up the Interface Address The device address of the LDC340 can be changed by using the IEEE488 DIP switch located at the rear of the LDC340. SW1 to SW5 have to be set according to this table: Address...
  • Page 36 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>...

  • Page 37: Connecting The Instrument

    To guarantee a safe transmission of data the IEEE488 cable between two units should not be longer than 2 meters 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...

  • Page 38: Ieee488 Bus Commands

    To communicate via the IEEE488 bus the standard control signals [MLA], [MTA], [UNL], [UNT], [ATN], [REN], [SPE], [SPD] are used. If the control program for the LDC340 is written in a basic language as e.g. BASIC, then these IEEE488 control signals are automatically transmitted to the LDC340 according to the used driver software and do not have to be explicitly produced in the control program.
  • Page 39 It will also reset the parser unit and the execution unit NOTE [DCL] [SDC] In contrast to the command the command will only set back the devices addressed. LDC340 / Page 33...

  • Page 40: Before Programming

    Blocks of message data are transferred between the controller and the LDC340 during communications. Messages sent from the controller to the LDC340 are called program messages and messages sent back from the LDC340 to the controller are called response messages. If a program message contains a query command i.e. a command which requests a response the LDC340 returns a response message.

  • Page 41: Data Format

    (Refer to IEEE488.2-1992 standard, chapter 8.7.3) 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 +1.1E-1 -22.1E+1 143.56789432E+306 (Refer to IEEE488.2-1992 standard, chapter 8.7.4) LDC340 / Page 35...

  • Page 42: Common Commands And Queries

    All set values will be reset to the default values. All outputs will switch off. 4.4.3 Self-test query Syntax: *TST? " " Response: Description: 0: Self-test finished with success. 4.4.4 Set Operation-complete bit Syntax: *OPC " " Description: The LDC340 will set the OPC-bit in the Standard-Event-Status- Register. LDC340 / Page 36...

  • Page 43: Operation-Complete Query

    " Response: Description: 1: Operation completed. 4.4.6 Wait Syntax: *WAI " " Description: The LDC340 will wait until the last operation is completed. 4.4.7 Event-Status-Enable-Register (ESE) Programming: *ESE <NR1> Syntax: " " Valid Range: 0..255 Default Value: 0 Description: Sets the Event-Status-Enable-Register (ESE).

  • Page 44: Service-Request-Enable-Register (Sre)

    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. LDC340 / Page 38...

  • Page 45: System Command Group

    :SYST:ANSW VALUE " " Default value: FULL Description: When switched to " VALUE " the LDC340 will send only the requested parameter without designator. Example: When requesting the actual laser diode current with " :ILD:ACT? " the LDC340 will only send [5.123456E-02]...

  • Page 46: Querying The Error Queue

    <Error text> following sequence: , " ". If the er- ror queue is empty: [0, "No error"] will response. (Please refer to chapter 4.8, “Error messages of the LDC340“ on page 52) 4.5.4 Oversampling rate Programming: Syntax: :SYST:OSR <NR1> " "...

  • Page 47: Status Command Group

    " Valid Range: 0...65535 Default Value: 0 Description: Sets the Device-Error-Event-Enable-Register (EDE). Reading: Syntax: :STAT:EDE? " " Response: [<NR1>] Description: Queries the Device-Error-Event-Enable-Register (EDE) and returns the content in decimal notation. The content is not modified. LDC340 / Page 41...

  • Page 48: Ldc340 Specific Commands

    4.7 LDC340 specific commands 4.7 LDC340 specific commands 4.7.1 Operation mode (MODE) Programming: :MODE CC Syntax: (constant current) " " :MODE CPI " (constant power, internal photo diode) " :MODE CPE " (constant power, external photo diode) " Assumption: The laser diode output is switched off.

  • Page 49: Photo Diode Polarity (Pdpol)

    4.7 LDC340 specific commands 4.7.3 Photo diode polarity (PDPOL) Programming: Syntax: :PDPOL CG " " :PDPOL AG " " Assumption: The laser diode output and the bias voltage is switched off. Description: Switches the photo diode polarity. Sets the laser diode current, the photo diode current and the optical power to default values.

  • Page 50: Switching The Bias Voltage On And Off (Pdbia)

    4.7 LDC340 specific commands 4.7.5 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.

  • Page 51: Switching The Output On And Off (Laser)

    4.7 LDC340 specific commands 4.7.6 Switching the output on and off (LASER) Programming: Syntax: :LASER OFF " " :LASER ON " " Default Value: OFF Assumption: To switch the output on there must be no device errors (interlock open, open circuit, over temperature, ...).

  • Page 52: Laser Diode Current (Ild)

    4.7 LDC340 specific commands 4.7.8 Laser diode current (ILD) Programming: Syntax: :ILD:SET <NR3> " " Valid Range: Depends on the instrument type. Default Value: 0 A Assumption: The operation mode is switched to constant current. Description: Sets the laser diode current. Unit: [A].

  • Page 53: Monitor Diode Current (Imd)

    4.7 LDC340 specific commands 4.7.9 Monitor diode current (IMD) Programming: Syntax: :IMD:SET <NR3> " " Valid Range: Depends on the instrument type. Default Value: 0 A Assumption: The operation mode is switched to constant power. Description: Sets the photo diode current. Unit: [A].

  • Page 54: Calibrating A Photo Diode (Calpd)

    4.7 LDC340 specific commands 4.7.10 Calibrating a photo diode (CALPD) Programming: Syntax: :CALPD:SET <NR3> " " Valid Range: Depends on the instrument type. Default Value: 1.0 A/W Assumption: The laser diode output is switched off. Description: Sets the sensitivity (η) of the monitor diode. Unit: [A/W].

  • Page 55: Optical Power (Popt)

    4.7 LDC340 specific commands 4.7.11 Optical power (POPT) Programming: Syntax: :POPT:SET <NR3> " " Valid Range: Depends on the instrument type and the programmed sensitivity of the monitor diode. Default Value: 0 W Assumption: The operation mode is switched to constant power.

  • Page 56: Reading The Optical Power From The Display (Poptp)

    4.7 LDC340 specific commands 4.7.12 Reading the optical power from the display (POPTP) :POPTP:ACT? Syntax: " " Response: [:POPTP:ACT <NR3>] Description: Queries the actual optical power, that is calculated from the position of the potentiometer marked ADJ next to the LED P .

  • Page 57: Reading The Monitor Diode Limit Current (Limmp)

    4.7 LDC340 specific commands 4.7.15 Reading the monitor diode limit current (LIMMP) :LIMMP:ACT? Syntax: " " Response: [:LIMMP:ACT <NR3>] Description: Queries the actual monitor diode limit current. 4.7.16 Reading the internal photo diode current (IPDI) Syntax: :IPDI:ACT? " " Response: [:IPDI:ACT <NR3>]...

  • Page 58: Error Messages Of The Ldc340-Ieee

    " recognized as valid command. [101, "Invalid character"] Category: Command Error Possible reason: ". This character sent to the LDC340 does not belong to the " allowed set of characters. [102, "Invalid numeric parameter"] Category: Command Error Possible reasons: "...
  • Page 59 ". 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 "...
  • Page 60 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 receive buffer (250 char max). LDC340 / Page 54...

  • Page 61: Ldc340 Operation Error Messages

    [1003,"Over temperature"] Category: Execution 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...
  • Page 62 4.8 Error messages of the LDC340-IEEE [1008,"No setting during constant current mode"] Category: Execution Error Possible reason: The set value of the monitor diode current or the optical power can not be changed during constant current mode. [1010,"Attempt to switch on laser while temperature is out of window"]...

  • Page 63: Status Reporting

    4.9 Status reporting 4.9 Status reporting The LDC340 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)
  • Page 64 4.9 Status reporting Output buffer ERROR Queue or serial poll Service Request Generation Figure 5 The status registers "ESR", "ESE", "STB" and "SRE" LDC340 / Page 58...

  • Page 65: Standard Event Status Register (Esr)

    “OR”-function, so that any "hit" leads to a logical 1 in bit 5 (ESB) of the STB. As any bit of the STB can assert an SRQ, every event (bit of the ESR) can be used to assert an SRQ. LDC340 / Page 59...

  • Page 66: Status Byte Register (Stb)

    4.9 Status reporting 4.9.3 Status byte register (STB) The bits of this register are showing the status of the LDC340. RQS: Request service message: Shows, that this device has asserted SRQ (red via serial poll). Master summary status: Shows that this device requests a *STB service (read via “...

  • Page 67: Reading The Stb By Detecting Srq

    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 service request was asserted. LDC340 / Page 61...

  • Page 68: Device Error Condition Register (Dec)

    The bits of this register show the errors, that occur during operation (device errors). The bits are active high. If the error disappears, the bits are reset to low. For an LDC340 bits 0 ... 4, 8 are used: (0) Over temperature Internal temperature too high. Wait until the LDC340 has cooled down.

  • Page 69: Device Error Event Register (Dee)

    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, every error (bit of the DEE) can be used to assert an SRQ. LDC340 / Page 63...

  • Page 70: Hints For Setting Up Control Programs

    4.10 Hints for setting up control programs The following flowcharts show the communication sequences between a control computer and a LDC340 using the IEEE488 interface. Use this sequences to ensure a fast and secure communication. Flowchart for writing device commands...
  • Page 71 Is EAV-bit set ? Query error-queue (write “:SYST:ERR?“ to the device) Read device- Poll status byte message (ibrd ...) (ibrsp ...) Is FIN-bit set ? Read error-message (ibrd ...) Is EAV-bit set ? Figure 7 Querying device messages LDC340 / Page 65...
  • Page 72 When communication problems occur at the bus or in case of error messages that cannot be explained the evalua- tion of the data transfer between the LDC340 and the control computer will then be possible without much effort.

  • Page 73: Maintenance And Repair

    There are no user serviceable modules inside. Any service must only be done by qualified service personnel. The LDC340 does not contains any components to be repaired by the user. If any disturbances in function occur please first contact the...

  • Page 74: Selecting The Line Voltage

    5.2 Selecting the line voltage The line voltage can be selected with the line voltage selector on the rear of the LDC340. The LDC340 can be operated with 100 V 115 V or 230 V. 5.3 Exchanging the line fuse If the line fuse has 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.
  • Page 75 • 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-...

  • Page 76: Exchange Of Internal Fuses

    Disconnect Power. To avoid electrical shock, first switch off the LDC340 power, and then disconnect the power cord from the mains power. With the LDC340 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.

  • Page 77: Troubleshooting

    5.5 Troubleshooting 5.5 Troubleshooting In case that your LDC340 system shows malfunction please check the following items: System does not work at all (no display on the mainframe): Mainframe LDC340 connected properly to the mains? Connect the LDC300 to the power line, take care of the right voltage setting of your mainframe.
  • Page 78 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 (profile@thorlabs.com) before sending the whole LDC340 system for checkup and repair to Thorlabs GmbH -Germany.

  • Page 79: Appendix

    6 Appendix 6.1 Warranty Thorlabs GmbH warrants material and production of the LDC340 modules for a period of 24 months starting with the date of shipment. During this warranty period Thorlabs GmbH will see to defaults by repair or by exchange if these are entitled to warranty.

  • Page 80: Certifications And Compliances

    Compliance demonstrated with CAB400 cable installed at the LD Output port. Emissions, which exceed the levels required by these standards, may occur when this equipment is connected to a test object. Minimum Immunity Test requirement. MOD IN port capped at IEC 61000-4-3 test. LDC340 / Page 74...
  • Page 81 Additional IEC61010-1/A2:1995 Safety requirements for electrical Compliance equipment for measurement, control, and laboratory use. Equipment Type Test and measuring Safety Class Class 1 (as defined in IEC 61010-1, Annex H) - grounded product LDC340 / Page 75...

  • Page 82: Technical Data

    0.1 µA / 1 µA Setting resolution photo current 1 (manual control) 0.03 µA / 0.3 µA Setting resolution photo current 1 (remote control) 0.1 µA / 1 µA Measurement resolution photo current 1 (manual control) LDC340 / Page 76...
  • Page 83 Max. input voltage ±10 V Small signal 3 dB bandwidth (CC) DC ... 50 kHz Laser diode modulation coefficient (CC) 400 mA/V ± 5% Laser diode modulation coefficient (CP) 0.2 mA/V ± 5% / 2 mA/V ± 5% LDC340 / Page 77...
  • Page 84 Output voltage for 0 ... I LD MAX Transmission coefficient 2.5 V/A ± 5% Computer Interface (LDC340-IEEE) Setting resolution 16 Bit Measurement resolution 12 ... 18 Bit sign depends on selected polarity in High Resolution mode, at reduced measurement speed LDC340 / Page 78...

  • Page 85: Thorlabs "End Of Life" Policy (Weee)

    6.4.1 Waste treatment on your own responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.

  • Page 86: Ecological Background

    6.4 Thorlabs “End of Life” policy (WEEE) 6.4.2 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.

  • Page 87: List Of Acronyms

    Event Status Register Command FINished Bit Group Execute Trigger Go To Local IEEE Institute for Electrical and Electronic Engineering I (current) Laser Diode I (current) Photo Diode Laser Diode Laser Diode Controller Light Emitting Diode Line Feed LDC340 / Page 81...

  • Page 88: List Of Figures

    The status registers "ESR", "ESE", "STB" and "SRE" Figure 6 Writing device commands Figure 7 Querying device messages Figure 8 Rear view of the LDC340 Figure 9 Exchanging the mains fuse Figure 10 Crossed out “wheelie bin” symbol LDC340 / Page 82...

  • Page 89: Addresses

    6.7 Addresses 6.7 Addresses For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to- date contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc. Thorlabs Ltd. sales@thorlabs.com sales.uk@thorlabs.com techsupport@thorlabs.com techsupport.uk@thorlabs.com Europe Scandinavia...

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