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LDP-3830 Precision Pulsed Current Source

1. February 2014 v LDP 3830 Safety Symbols This section describes the safety symbols and classifications Technical specifications including electrical ratings and weight are included within the manual See the Table of Contents to locate the specifications and other product information The following Classifications are standard across all ILX Lightwave products Indoor use only Ordinary Protection This product is NOT protected against the harmful ingress of moisture Class Equipment grounded type Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree II Installation overvoltage Category II for transient overvoltages Maximum Relative Humidity lt 80 RH non condensing Operating temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9848 ft This equipment is suitable for continuous operation February 2014 vi LDP 3830 Safety Marking Symbols This section provides a description of the safety marking symbols that appear on the instrument These symbols provide information about potentially dangerous situations which can result in death injury or damage to the instrument and other components radiation Visible and or AN erat ia ee NU Alternating current A invisible laser Caution risk of OCE Caution Frame or chassis electric shock Conductor hot surface terminal Terminal 4 On in po
2. STATus OPERation NTRansition Description Parameters Notes Reset Value Examples Controls the operational status negative transition filter register Value between 0 and 32767 representing the bits of the operational status negative transition filter register when expressed in base 2 binary format Causes the corresponding bit in the operational status event register to be set when the corresponding bit in the operation event condition register transitions from a 1 to a 0 There are two bits used in the LDP 3830 Bit 1 Settling creates an event when the current pulse width or period is done settling on the setpoint Bit 8 Output On creates an event when the output shuts off 0 STAT OPER NTR 256 Enables an event when the output shuts off STATus OPERation PTRansition lt nrf value gt STATus OPERation PTRansition Description Parameters Notes Reset Value Examples February 2014 Controls the Operational Status Positive Transition Filter register Value between 0 and 32767 representing the bits of the Operational Status Positive Transition Filter register when expressed in base 2 binary format Causes the corresponding bit in the operational status event register to be set when the corresponding bit in the operation event condition register transitions from a 0 to a 1 There are two bits used in the LDP 3830 Bit 1 Settling creates an event when the current pulse width or period is starts to settli
3. The firmware on the LDP 3830 can be reinstalled or upgraded via USB 2 0 by visiting the ILX Lightwave website at www newport com ilxlightwave Follow the directions on the LDP 3830 product web page to complete the firmware upgrade GPIB Communication The IEEE 488 1 GPIB interface connector is located on the rear panel directly above the power input See Figure 1 2 on page 3 The 24 pin connector is tapered to ensure proper orientation of the GPIB cable Use fingers to tighten the two screws on the cable connector A total of 15 devices can be connected together on the same GPIB interface bus The cables have double sided male female connectors on each end so that several cables can be stacked This allows more than one cable to be attached to any one device However the maximum length of the GPIB interface bus must not exceed 20 meters 65 feet or 3 meters 10 feet per device USB Communication The USB connector is located on the back rear panel next to the GPIB connector This USB connector is the square B style connector A standard USB A B cable is required to communicate with the instrument This instrument uses the USB Test and Measurement class and drivers are available from National Instruments and Agilent Technologies As a convenience the National Instruments Visa Libraries can be installed from the accompanying CD Please refer to Chapter 3 for more detailed instructions on operating the instrument through USB Tilt Foot Adju
4. Failure to observe this precaution can result in severe personal injury or death AC Line Power Requirements The LDP 3830 is factory configured for operation at nominal line voltages of 100 120 or 220 240 VAC Make sure the voltage requirements that are printed on the back panel of the instrument matches the power line voltage in your area Contact ILX Lightwave Customer Service if you need to reconfigure the input voltage range Power up Sequence With the LDP 3830 connected to an AC power source pressing POWER supplies AC line power to the instrument and starts the following power up sequence All front panel indicators ON all 7 segment displays indicate 8 All front panel indicators OFF Display shows serial number and firmware version of the LDP 3830 Display shows the model and serial number of the attached LPB 386 pulse board Each display lasts 2 3 seconds February 2014 5 LDP 3830 During the front panel indicator test the LDP 3830 performs a self test to ensure that internal hardware and software are communicating If the LDP 3830 cannot successfully complete the test an error message is displayed See Appendix A for a complete list of error messages After the self test LDP 3830 configuration is set to the same state as when power was last turned off If you wish you can use the recall function to quickly get to a different configuration See Store and Recall for more information Firmware Upgradeability
5. SOURce PULSe WIDTh lt seconds gt SOURce PULSe WIDTh Description Controls the pulse width Parameters lt seconds gt The output current pulse width in seconds Reset Value The seconds must be in the range of 25e 9 to 1e 6 This is a coupled command with SOURce PULSe DCYCle and SOURce PULSe PERiod This command will not change the period but will change the duty cycle to adjust to this set point Changes that would cause the duty cycle to go out of the specified range will cause an execution error Reset Value 500e 9 Examples WIDTH 2E 7 Adjuss pulse width to 200 ns WIDTH A response of 3E 8 means that the pulse width is 30 ns STATus OPERation EVEnt Description Read the operational event register Notes This register requires that the associated PTR or NTR filters are set before the condition register bit can set the event register The data in this register is latched until it is queried Querying the register clears the data ensuring that no events are missed between subsequent reads of the register CLS will also clear this register There are two operation events enabled in the LDP 3830 Bit 1 Settling meaning that the current pulse width or period is settling on the setpoint Bit 8 Output On meaning that the output is currently on See Figure 3 2 for a description of the operational status registers Examples STAT OPER A response of 256 means that there has been an Output On event STATus OPERatio
6. The QUEStionable status register contains bits which give an indication of the quality of various aspects of the signal A bit set in the condition register indicates that the data currently being generated is of questionable quality due to a parameter associated with the bit For instance the current warning could mean that the current is changing and has not reached the setpoint or that a command was sent to the unit that was clipped to a value based on the limits of the instrument The timing warning may indicate that the external trigger is faster than the 5 duty cycle limitation of the instrument and was therefore ignored A pulse board error indicates that there is no pulse board or an unrecognized pulse board is attached to the instrument Interlock 1 and 2 indicate that the unit is in interlock and will not operated Commands associated with the QUEStionable status register STATus QUEStionable CONDition Queries the Condition Register STATus QUEStionable EVENt Queries Clears the Event Register STATus QUEStionable EVENt NTRansition Negative Transition Register STATus QUEStionable EVENt PTRansition Positive Transition Register STATus QUEStionable ENABle Questionable Event Enable Register OPERation Status The OPERation status register contains conditions that are part of the instrument s normal operation Settling indicates that the setpoint has been changed and the instrument is adjusting to
7. v Safety markings used on the instrument Information about the warranty yY Customer service contact information Safety Information and the Manual Throughout this manual you will see the words Caution and Warning indicating potentially dangerous or hazardous situations which if not avoided could result in death serious or minor injury or damage to the product Specifically A CAUTION Caution indicates a potentially hazardous situation which can result in minor or moderate injury or damage to the product or equipment M warnine Warning indicates a potentially dangerous situation which can result in serious injury or death a ad WAR NING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the following conditions exist or are even suspected do not use the instrument until safe operation can be verified by trained service personnel Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the instrument to ILX Lightwave or authorized local ILX Lightwave distributor for service or repair to ensure that safety features are maintained All instruments returned to ILX Lightwave are required to have a Return Authorization Number assigned by an official representative of ILX Lightwave Corporation See Returning an Instrument for more information
8. The event bit is set when a specific event occurs Operation Complete is set when all pending device operations have been finished after OPC common command has been executed Unused and always reports 0 Query Error means that data in the output has been lost or that none was available Device Specific Error is an error has occurred that is neither a command query or execution error Execution Error means a parameter was evaluated to be outside the legal input range or capability Command Error means a command could not be interpreted by the parser Unused and always reports Power On indicates that an off to on transition has occurred in the power supply CLS will clear this register ESR A response of 32 means a command error has occurred Instrument Identification Description Parameters Notes Examples OPC Requests the instrument to identify itself None Returns a string of instrument identification information The string contains a comma separated list of manufacturer model number serial number and firmware revision IDN Responds with ILX Lightwave _LDP 3830 38301111 1 0 1 0 Operation Complete Description Parameters Notes Examples February 2014 Sets the operation complete bit bit 0 in the standard event status register when all pending overlapped commands have been completed None This command does not hold off subsequent operations You can determine when the overlapped
9. break and remake before the final circuit break Therefore securing the cabling is very important Warm Up and Environmental Considerations Operate the LDP 3830 at an ambient temperature in the range of 10 to 40 C Storage temperatures should be in the range of 40 to 70 C Let the LDP 3830 warm up for at least 1 hour before use to achieve the rated accuracy Pulse Mode Operation You can operate the LDP 3830 in several modes constant duty cycle DC constant pulse repetition interval PRI or external trigger EXT For pulse mode operation in any control mode follow the steps below e Plug the LDP 3830 into an AC power source supplying the correct voltage for the instrument refer to the back panel for the correct voltage ratings e Turn on the LDP 3830 by pressing the front panel POWER button o The output stage will be off at power up and the instrument will be configured to the state it was in when the power was last shut off e Configure the Current Limit under PARAM o Use the RECALL feature to recall a pre configured setup and then recheck the configuration parameters Connect the laser or other device to the instrument Press the CURRENT button Turn the ADJUST knob until the desired setpoint is displayed Select the mode of operation by pressing PRI DC or EXT twice For DC or PRI modes press the corresponding button and using the ADJUST knob to set it the respective value e Next set the pulse width by pressi
10. byte register is set Bit 6 in the status byte register is unique in that it indicates that a service request is enabled and the corresponding bit 6 in the service request enable register is ignored The status byte register can be read with either a serial poll over GPIB READ_ STATUS BYTE request over USB or the STB common query Depending on which method is used the status byte register response may change If read by serial poll over GPIB or READ_ STATUS _ BYTE over USB the value of the status byte register is not altered however if the system had asserted a request for service the register will be cleared without a corresponding change to the status byte Bit 6 will report 0 if the instrument is polled again before a new reason for service has occurred Reading with the STB query will send the contents of the status byte register as a single element The response will be identical to that of the serial poll or READ_STATUS_ BYTE request except that bit 6 will report the inclusive or the bitwise combination excluding bit 6 of the status byte register and the server request enable register The STB common query does not directly alter the status byte or the request for service message Commands associated with the status byte are STB CLS SRE SRE PSC PSC These as well as all valid queries will set the MAV bit and all errors will set the error queue bit February 2014 20 LDP 3830 Device Status Continu
11. commands have completed either by polling the standard event status register ESR or by setting up the status system such that a serve request is asserted when bit 0 is set in the standard event status register OUTPUT ON OPC Will set bit 0 in the standard event status register when the output is on 28 LDP 3830 OPC Operation Complete Query Description Parameters Notes Examples Places an ASCII character 1 into the instrument s output queue when all pending operations have been finished None This command is a sequential command that holds off all subsequent commands until the 1 is returned Make sure you have set the timeouts appropriately for using this command when you expect long delays OPC A response of 1 means that all overlapped commands are complete PSC lt number gt Power on Status Clear Description Parameters Notes Examples PSC Sets automatic power on clearing of the enable registers A number that rounds to the integer zero disables the power on clearing of enable register while any other number enables the power on clearing of enable registers Registers affected Condition Status Enable Service Request Enable Event Status Enable Standard Event Status Enable Operational Event Enable Questionable Event Enable Factory default condition Disabled In the disabled state the values of the enable registers are saved through power OFF ON The power on status clear fla
12. of the instrument Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag Place the instrument in the original packing container with at least 3 inches 7 5 cm of compressible packaging material Shipping damage is not covered by this warranty Secure the packing box with fiber reinforced strapping tape or metal bands Send the instrument transportation pre paid to ILX Lightwave Clearly write the return authorization number on the outside of the box and on the shipping paperwork ILX Lightwave recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides remainder of the original warranty or for 90 days whichever is greater Claims for Shipping Damage When you receive the instrument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier The factory will supply you with a quotation for estimated costs of repair You must negotiate and settle with the carrier for the amount of damage February 2014 viii LDP 3830 Comments Suggestions and Problems To ensure that you get the most out of your ILX Lightwave product we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support
13. suspected remove the LDP 3830 from service Do not use the LDP 3830 until trained service personnel can verify safe operation Visible damage Severe transport stress Prolonged storage under adverse conditions Failure to perform intended measurements or functions If necessary return the LDP 3830 to ILX Lightwave for service and repair to ensure that safety features are maintained Initial Inspection When you receive your LDP 3830 Precision Pulsed Current Source verify that the following items were shipped with the instrument LDP 3830 Precision Pulsed Current Source LPB 386 LDP 3830 Pulse Board CC 385 Pulse Interconnect Cable LDP 3830 Manual Power Cord Shipping Kit Verify that the line voltage marked on the rear panel matches the line voltage intended to power the unit February 2014 1 LDP 3830 Product Overview The LDP 3830 Precision Pulsed Current Source was designed for applications requiring fast repeatable current pulses up to 5A with a compliance voltage of 20V To provide the required pulse performance an external pulse driver board the LPB 386 is included in the initial system purchase The LPB 386 is required to operate the LDP 3830 Pulse parameters such as pulse width duty cycle and frequency are programmable from the front panel or through the GPIB or USB interface The current source can be operated in three modes constant duty cycle constant frequency and external trigger which allows adjustment of the p
14. the new setpoint Settling is also likely to result in a current or timing warning questionable status Commands associated with the OPERation status register STATus OPERation CONDition Queries the Condition Register STATus OPERation EVENt Queries Clears the Event Register STATus OPERation EVENt NTRansition Negative Transition Register STATus OPERation EVENt PT Ransition Positive Transition Register STATus OPERation ENABle Questionable Event Enable Register Command Timing This section describes for each device dependent command whether that command is performed in an overlapped or sequential manner In other words it states whether the next command may begin while the first is being executed or if it must wait until the first command is completed before its execution begins Sequential Overlapped Commands All device dependent commands are executed in an overlapped manner i e subsequent commands may begin before the current command has completed Three common commands OPC WAI OPC are used to synchronize operation to the execution of overlapped commands All overlapped commands are associated with a pending operation flag which is set to true when the action is being performed The flag is set to false when the operation is finished or aborted When all operations are complete the no operation pending flag will transition from false to true If OPC is sent down the instrume
15. to the root node and SOURCE and PULSE are default nodes under the root node e CURRENT 2 5 LIMIT 3 will set the current to 2 5A since SOURCE and LEVEL are default nodes and then return an error since LIMIT is not on the root node e CURRENT 2 5 WIDTH 100e9 will set both the current and the pulse width since there are default nodes to each command from the root node Separators Separators are required between the program header and program data between individual program data elements and between each IEEE 488 1 Command Query White space is required between the program header and parameter data White space is any number of ASCll encoded bytes in the range of 00 09 OB 20 0 9 11 32 decimal This range includes the ASCII control characters and the space but excludes the newline Table 3 3 White Space Acceptable Not Acceptable CURRENT 3 0 CURRENT3 0 A comma is required between multiple program data elements and white space may be included on either sided of the comma It is ignored by the parser A semicolon separates one complete command from another Again white space may be included on either side of the semicolon to enhance readability Parameters When a command requires a parameter the parameter syntax is shown in the command following the program header The LDP 3830 accepts both character program data which is indicated by mixed case text after the program header or numerical data whi
16. 1 Clears OPC or OPC device requirements 2 Stops operation of overlapped commands 3 Sets all device specific function to a known state RST Value The reset command does NOT affect the following 1 Output Queue 2 Enable Registers 3 Event Registers 4 PSC state 5 Memory contents associated with SAV SAV lt bin gt Save Description Saves the current instrument configuration to non volatile memory Parameters A value from 1 10 Notes The SAV operation saves the contents of everything affected by the RST command It is not necessary to save the current setup for next power on The current setup is automatically stored and recall at next power on Use RCL lt bin gt to restore the saved configuration Examples SAV 3 The current instrument configuration is stored in memory bin 3 SRE lt integer gt Service Request Enable Command Description Sets the service request enable register bits Parameters A value in the range of 0 to 255 February 2014 30 LDP 3830 Notes Examples SRE The integer sent as a parameter when expressed in binary format each bit repress a bit in the service request enable register A bit value of one indicates an enabled condition A bit value of zero indicates a disabled condition Bit 6 will be ignored Setting the service request enable register allows the programmer to select which summary messages in the status byte register may cause service requests Each bit in the service request enabl
17. 3 Duty cycle resolution and accuracy is limited by the PRI and pulse width resolution and accuracy 4 Dependant on device forward voltage and lead inductance 5 Single shot performance can be achieved after initial current ramp See TN 3830 2 LDP 3830 Trigger In Out Performance for additional information 6 Using trigger in the trigger out pulse will be 5x the trigger in pulse width up to 12 5 us In keeping with our commitment to continuous improvement ILX Lightwave reserves the right to change specifications without notice and without liability for such changes 4 LDP 3830 Chapter 2 Operations This chapter is an overview of the operation of the LDP 3830 Precision Pulse Current Source v Installation v Connecting to the instrument Introduction to the LDP 3830 front panel yY General operating procedures Installation Grounding Requirements The LDP 3830 Precision Pulse Current Source comes with a three conductor AC power cable The power cable must be plugged into an approved three contact electrical outlet or used with a three contact to two contact adaptor with the grounding wire connected to an electrical ground safety ground ILX Lightwave recommends connecting the instrument only to properly earth grounded receptacles The power cord connector and power cable meet IEC safety standards WARNING To avoid electrical shock hazard connect the instrument to a properly earth grounded three prong receptacle only
18. 35 means that the bias current limit is 350 mA SOURce CURRent STEP lt amps gt SOURce CURRent STEP Description Controls the pulse current step size in amps Parameters lt amps gt The step size ranging from 0 01 to 5 00 Notes Use SOURce CURRent LEVel UP DOWN to step the current after setting the step amount Reset Value 0 01A Examples CURR2 0 2 CURR2 STEP 0 1 CURR2 UP Sets bias current to 200mA sets bias current step to 100mA increases bias current setpoint to 300mA February 2014 34 LDP 3830 SOURce PULSe DCYCle lt percent gt SOURce PULSe DCYCle Description Controls the duty cycle in of the pulses Parameters lt percent gt The duty cycle percentage to be used for immediate trigger mode Notes The percent must be in the range of 0 01 to 5 00 This is a coupled command with SOURce PULSe PERiod and SOURce PULSe WIDTh This command will not change the period but will change the width to adjust to this setpoint Changes that would cause the width to go out of the specified range will cause an execution error In some cases when the period and width specify a duty cycle less than 0 01 this will report 0 as its set point Reset Value PERiod 500us WIDTh 500ns DCYCle 1 Examples DCYC A response of 0 30 means that the duty cycle is 0 30 SOURce PULSe DELay lt seconds gt SOURce PULSe DELay Description Controls the delay between the trigger in signal and the pulse output gen
19. 4 microseconds SOURce CURRent LEVel lt amps gt UP DOWN SOURce CURRent LEVel Description Controls the pulse setpoint Parameters lt amps gt Sets the output in amps to a specific value UP DOWN Increments or decrements the current setpoint by the value in SOURce CURRent STEP Notes The range for this is 0 to 5 Amps if you set a value higher than SOURce CURRent LIMit the value will be clipped at the limit and a current warning questionable status will be set Reset Value 0 Examples CURR 4 5 Sets pulse output current setpoint to 4 5 A CURR 0 2 CURR STEP 0 1 CURR UP Sets bias current to 200mA sets bias current step to 100mA increases bias current setpoint to 300mA CURR LEV A response of 0 21 means the output current setpoint is 210 mA SOURce CURRent LIMit lt amps gt SOURce CURRent LIMit Description Controls the pulse current limit Parameters lt amps gt Specified hardware and set point current limit Notes The current limit sets independent hardware monitoring of the current Due to overshoot and accuracy limitations this will usually need to be set higher than the current setpoint Setting the limit to a value lower than the SOURce CURRent LEVel will result in the setpoint clipping at the value of the limit and the current warning questionable status will be set Reset Value 5 50 Amps Examples CURR LIM 4 5 Sets pulse output current limit to 4 5 A CURR2 LIM A response of 0
20. 6 LDP 3830 Pulse Board Pulse Interconnect Cable CC 388 Current Monitor Cable Single Rack Mount Kit Dual Rack Mount Kit February 2014 3 LDP 3830 Specifications PULSE CURRENT OUTPUT Range Resolution Accuracy Pulse Amplitude Repeatability Compliance Voltage Overshoot Output PULSE CURRENT LIMIT Range Resolution Accuracy Limit 0 00 to 5 00A 0 01A 0 05A 1 of setpoint lt 0 005A 0 5 20V lt 5 Floating 0 00 5 50A 0 01A 0 05A 1 of setpoint PULSE WIDTH PARAMETERS Range 25 ns to 1 us Resolution 1ns Accuracy 2 ns 1 of setpoint Repeatability 0 15 ns Rise Fall Time 2 lt 10ns PULSE REPETITION INTERVAL PRI Range Internal Range External Resolution Accuracy DUTY CYCLE Range Resolution Accuracy MEASUREMENT DISPLAY Current Range Current Resolution Current Accuracy TRIGGER IN Type Connector Delay Set Point Resolution Jitter Pulse Width TRIGGER OUT Type Connector Delay Set Point Resolution Jitter Pulse Width 500 ns to 1 ms 500 ns to single shot 10 ns PRI lt 10 us 40 ns PRI lt 100 us 350 ns PRI lt 1 ms 0 2 of set point 0 01 to 5 00 0 1 typical lt 1 typical 0 00 5 00 A 0 01 A 0 05 A 1 of reading TTL rising edge BNC Adjustable 10 ns 10 ns gt 100 ns TTL BNC Adjustable 10 ns 1ns 25 PRI up to 12 5 us EXTERNAL MONITOR LPB 386 SMB Connec
21. MMediate Examples TRIG SOUR external Places the unit in external trigger operation TRIG SOUR A response of 0 means that the instrument is set to external trigger mode a response of 1 means that the instrument is set to immediate trigger mode February 2014 40 LDP 3830 Chapter 5 Troubleshooting This chapter is to help you resolve problems quickly If you need help contact ILX Lightwave Customer Service See page viii for contact information ILX Lightwave Corporation provides in house and on site calibration services for ILX instruments Most ILX instruments including the LDP 3830 require yearly calibration to ensure performance to published specifications ILX factory calibrations employ NIST traceable measurement instrumentation and our calibration engineers and technicians use automated test equipment to accurately and efficiently capture and record calibration data An original certificate of calibration authenticity is provided with all instrument calibrations and a detailed report showing any pre calibration out of tolerance conditions is available upon request Calibration turn times are normally five business days or less On site calibrations can be performed around your production schedule night or day seven days a week Please contact ILX Customer Support see Comments Suggestions and Problems on page viii for contact information for additional calibration information For further assistance with technical sol
22. Pulse wide adjustment may be limited by other settings and duty cycle requirements CURRENT Pressing the CURRENT button allows the user to adjust the current set point of the LDP 3830 ON Enables or Disables the LDP 3830 current output after a two second delay When turning on the output LED will flash for two seconds before the output is enabled During this period pressing the ON button again will cancel the turn on sequence After the output is enabled pressing the ON button will immediately turn off the output February 2014 10 LDP 3830 General Operating Procedures The following sections present some operational guidelines as well as some common operating procedures Remote operations are discussed in Chapter 4 Before turning on the output be sure that the current limit is slightly greater than your laser s maximum operating current Also adjust the output current set point to a safe and reasonable level If this is the first time operating the LDP 3830 or a new laser is being used ILX would recommend setting the current to zero and slowly ramping up to the desired set point The connections to the laser must be secure to prevent an open circuit should they be jostled or bumped If an open circuit occurs during laser operation then the OUTPUT will be turned off automatically Experience indicates that if an open circuit occurs during laser operation while the OUTPUT is ON that the laser may be damaged by a momentary circuit
23. RB User s Guide Precision Pulsed Current Source LDP 3830 jj ILA Lightwave LDP 3830 PRECISION PULSED CURRENT SOURCE L dih TLX Lic nuwere A Newport Corporation Brand ILX Lightwave 31950 Frontage Road Bozeman MT U S A 59715 U S amp Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custhelp com www newport com ilxlightwave 70045001 February 2014 Table of Contents Safety and Warranty Information cccccccssssssseeeeeeeeeeeeeeeeeeees v Safety Information and the Manual c cceeeeeeeeeeeeeeeeneeeeeeeeeeeeeeees v General Safety Considerations ccceeeeeeeeneeeeeeeeeeeeeeeeeneeeeeeeeeeeeeeees v Safety Symbols icici nati ac ai ai ri dn a aca na cd vi Safety Marking VINO OS Secsties ines toes ancatacn nce tads mentees mea tece ncabocmmentocsantins vii WV AINE shaina iaid ie ieai vii LIMITATIONS OE a EE EEEE aden bak A A AA vii Returning an Instrument ssssssseseseeeseeestrtrrrtesserrtrrnnnnnnsseerrnnnnnnneneent viii Claims for Shipping Damage ccceesccceeeeseneeeeeeseaeeeteeeeeeeeeeeeaees viii Comments Suggestions and Problems cccccccccccccecceeeeeeeeeeeeees ix Chapter 1 Introduction and Specifications ccccccccssseeeees 1 Safety Considerations yxsscitestersegeccasceetetendeaice seine seen ates kets at 1 Initial INS POCUON szeiccssciestecectetushe toads tas undcnz alelabeede soe ndecdneengava aE a
24. UST SET SET paran PRI PULSE wioTH PRESS TWICE DC CURRENT 0 RECALL STORE r _ B s Figure 2 1 Front Panel Display Display Output Current The LDP 3830 consists of a large 7 segement LED display and 20 digit dot matrix The dot matrix display is used to display control mode parameter values and error messages as well as adjust pulse repetition interval duty cycle and pulse width In normal operation the 7 segment display shows output current The left side of the dot matrix displays current control mode PRI DC EXT and the set point value By pressing the DISPLAY button the right portion of the dot matrix display cycles between pulse width or the calculated value for duty cycle in zs constant PRI mode or the calculated PRI value in Se hota constant DC mode In EXT mode the right display will only show pulse width Adjust Knob and Button The ADJUST knob and button is located on the upper right corner of the LDP 3830 front panel The knob is used to change the set points and enter parameter values the GPIB address and store or recall bin numbers The ADJUST button has three modes of operation off led off coarse adjust led on and fine adjust led on bright Upon pressing a function for adjustment pulse current pulse width pulse repetition interval duty cycle the ADJUST LED will be illuminated and the user can begin adjusting The ADJUST LED will automatically ti
25. WIDTh SOURce PULse DCYCle and SOURce PULse PERiod along with SOURce CURRent LEVel and SOURce CURRent LIMit are coupled commands This means that setting one may have an effect on the other values With coupled commands care needs to be exercised when sending down commands For instance if the instrument is currently set to a pulse width of 6Ons and a period of 1 2us if you sent the command WIDTH 100e 9 followed by the command PERIOD 5e 6 the WIDTH command would result in a execution error This is because setting a 100ns pulse width at a period of 1 2us would violate the 5 limit on duty cycle The PERIOD command would execute but then the settings would be pulse width of 60ns and period of 5us If these commands were sent down in the opposite order the settings would be as expected The better alternative is that you send down both commands in one message WIDTH 100e 9 PERIOD 5e 6 We have designed the parser to wait until we have gotten all of the coupled commands an then we parse them together Sending them together will take the burden off of the programmer to determine the correct order to send down parameters But keep in mind that it doesn t solve all of your problems If WIDTH 100e 9 PERIOD 5e 6 DCYCLE 1 was sent to the instrument the instrument does not attempt to guess which two headers were the most important February 2014 18 LDP 3830 and since all three of those values can t be obtained together an exe
26. You may contact us in whatever way is most convenient Phone 800 459 9459 or 406 586 1244 Fax 406 586 9405 On the web at ilx custhelp com Or mail to ILX Lightwave Corporation P O Box 6310 Bozeman Montana U S A 59771 www ilxlightwave com When you contact us please have the following information Model Number Serial Number End user Name Company Phone Fax Description of what is connected to the ILX Lightwave instrument Description of the problem eS eK If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service is responsible for any shipping damage when returning the instrument to ILX Lightwave ILX recommends you insure the shipment If the original shipping container is not available place your instrument in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides We look forward to serving you even better in the future February 2014 ix LDP 3830 February 2014 x LDP 3830 Chapter 1 Introduction and Specifications This chapter is an introduction to the LDP 3830 Precision Pulsed Current Source v Safety considerations and instructions V Product overview and theory of operation v Options and accessories VY Specifications Safety Considerations A CAUTION If any of the following symptoms exist or are even
27. ackets are used to enclose a keyword that is optional when programming the command The command will have the same effect whether included or not and is referred to as a default node Letter case is used to differentiate between the accepted short form the uppercase characters and the long form the whole keyword All commands are case insensitive but each keyword must be of the short or long form A character at the end of a program header indicates that it is a query Table 3 1 Acceptable and Not Acceptable Commands Acceptable Not Acceptable lt SOURCE CURRENT level SOURCE LEVEL CurrenT CURREN 488 2 Common Program Headers IEEE 488 2 Common Commands and Queries are distinguished by the which begins each mnemonic All the IEEE 488 2 Common Commands and Queries supported by the LDP 3830 are listed below February 2014 15 LDP 3830 Table 3 2 488 2 Common Commands Supported by LDP 3830 CLS ESE ESE ESR IDN OPC OPC PSC PSC RCL RST SAV SRE SRE STB TST WAI Command Tree Structure All device dependent commands are structured in a tree format as shown in Figure 3 2 Each of the legal paths is shown followed by its list of path options followed by the commands themselves It is recommended that the first time user begin learning the commands by using the full path notation Once familiar with the commands command path shortc
28. ansition Register NTR that active the corresponding bits in the event register The PTR allows an event to be reported when the condition changes from false to true The NTR allows an event to be reported when the condition changes from true to false Setting both allows an event to be reported anytime the condition changes Clearing both transition registers disables event reporting CLS will clear all event registers within the instrument PSC enables clearing of event registers at power on Standard Event Status Register The standard event register is defined in the IEEE 488 1 1992 specification It does not have a corresponding condition register Bit 7 Power On indicates that an off to on transition has occurred in the power supply Bit 6 User Request indicates that a front panel button press has requested local control Bit 5 Command Error indicates an error has been detected by the command parser Bit 4 Execution Error indicates a command was valid but could not be executed Bit 3 Device specific Error indicates an error that occurs due to hardware limitations Bit 2 Query Error reports data in the output queue is not available or has been lost Bit 1 Unused and always reports 0 Bit 0 Operation Complete is generated in response to the OPC command Commands that affect the standard event register are OPC CLS ESR ESE ESR PSC and PSC February 2014 21 LDP 3830 QUEStionable Status
29. ar Configuration Device B Device C Device A Device D Star Configuration Figure 3 1 GPIB Connections Reading the GPIB Address Before operating the LDP 3830 remotely its GPIB address must be known Simply press the PARAM button until the GPIB address is displayed in the dot matrix display The factory default address is 1 Changing the GPIB Address Every device on the GPIB bus must have a unique address If it is necessary to change the address press the PARAM button until the GPIB address is displayed Then press the SET button and adjust the knob until the desired address value is shown When the instrument times out then the new GPIB address is stored in nonvolatile memory The allowable address range is 1 to 30 Basic USB concepts The LDP 3830 communicates with the computer using the USB Test and Measurement Class USB488 Subclass USBTMC488 If you are using other test equipment you may already have this on your computer as it is included with National Instruments and Agilent Technologies VISA libraries The USBTMC488 passes messages based on the IEEE 488 1 and IEEE 488 2 standards In most cases code written for GPIB can be used over the USB interface by only changing the connection string Changing Operation from Local to Remote Sending a command over the GPIB or USB bus automatically puts the instrument in remote mode The remote indicator in the display identifies
30. baisse Si 1 Progucr OVUCIVIEW ANERE E EE EEEE E E EE EEEE 2 Options and ACCESSOTIES nrs tcratctaseteiatiscentcctente eutalsrietat ela se te ods 3 DPECIICAIONS paca ees ANa a naa Na na a NAA 4 Chapter 2 QUOLAOMS ariere eiia tase EEA EEEE 5 EEE E E E E 5 Grounding Requirements scecses cc eesdeetet scarce cave oeeere atti 5 AC Line Power Requirement ccccececcceeeeeeeceeeeeeeeeeeeeseaaeeeeneaas 5 Power UP SEQUENCE iihi opi tinct hud anand eine RE 5 Firmware Upgrad eability siscc icel acces ctsectiest eedeariantaeeeeanniieenveeie 6 GPIB Communication cssctetissstsvacenernttns Praeusdtuncvateredbeaeucsanvisidasdevaanuntiaeen 6 USB Communication ss x acsicectanalionedscatspiteasasaunsaecasmecesgecedaimeieaacaseauvdans 6 THE FOOU AG USIMONL niae euan anaana anapun aa e dornan aiteeeddacgasoeenes 6 Rack MOuUMtINO fe ate cory a aeaaea AAE lee ales ues AAE aED Meds 6 Laser Connections iseni er eea e eiaa TAa pE eva 6 Current Monitor on the LPB 386 ccccecesssseeeeeeseeeeeeeeeseeeeeeeeeeeees 7 Interlock CONNEGHONS aree RE EE E Ta 7 Connecting to the Laser jce cc c cence caceh aencteicesnadel necapesceeecttaesceneantasearee 7 February 2014 i LDP 3830 Display seer eriaren aa pina EAA eka REO Ea ARE ENE AEAN EAEN ES 8 Adjust Knob and Button ccccisac pepe thes onvenivede action eidindieiatindeitdieoenennee 8 SONU ick cas S EEE ea xan cep EEEE TEE tench cee saat wi ata tient T aes 9 PUN SS iscsi Site Bae Seon a a arate oe
31. ch is indicated by the name of the value enclosed in right and left carrots lt gt The vertical bar can be read as or and separates alternative parameter options Numbers are represented in ASCII format in binary integer floating point form or in engineering scientific notation For example the number twenty may be represented by any of the following ASCII strings February 2014 17 LDP 3830 Table 3 4 Numeric Format Integer 20 20 Floating Point 20 0 20 0 Ae 2 0E 1 2 0E 1 Scientific Notation 2 0e4 1 42 Det H14 h14 Binary Format 024 024 B10100 610100 There are no default values for omitted parameters If a command is expecting a parameter and nothing is entered error 109 Missing parameter is generated Following are examples of invalid command strings that will produce errors Table 3 5 Invalid Syntax Command Strings COMMAND COMMENT OUTP STATE IDN Missing colon STATE expected OUTP ON IDN Missing semicolon INC command generates an error OUTP ON Space not allowed before question mark Space missing between WIDTH command and the parameter WIDTH0 000001 WIDTH value 0 000001 Numeric data is required with PSC 1 on 0 off RCL 0 10 see front panel RECALL function SAV 1 10 see front panel STORE function and ESE 0 255 see Figure 4 2 GPIB connector diagram Coupled Commands SOURce PULse
32. clock has not achieved phase lock Bit 5 Frequency Warning means the internal clock has not achieved phase lock Bit 9 Pulse Board Error means the pulse board is either removed from the instrument or is incompatible with the instrument Bit 10 Interlock 1 means that Interlock 1 is closed or in the TTL low state Bit 11 Interlock 2 means that Interlock 2 is open Bit 14 Command Warning means that a current set point was sent but was limited by the current limit or that the exact duty cycle sent down was not obtainable due to the period and width resolution These are not fatal warnings that indicate that the state is probably expected but may deviate in some manner Several of these conditions will cause the instrument to turn off therefore clearing the condition this will cause an event if either transition filter is enabled Some of these like the pulse board error and interlock conditions can be used to inform an operator if the system is ready to be run Use the STATus QUEStionable NTRansition and STATus QUEStionable PTRansition filters to enable the associated event register STAT QUES COND A response of 2048 means that Interlock 2 is open STATus QUEStionable ENABle lt integer gt STATus QUEStionable ENABle Description Parameters Notes Controls which questionable events cause summary bit 3 of the status byte to be set Value between 0 and 32767 representing the bits of the questionable event enable register when expres
33. cution error will occur and the previous settings will remain unchanged See Chapter 4 Command Reference for descriptions of all commands including common commands supported by the LDP 3830 QUEStionable Status Voltage Warning Current Warning Timing aming Frequency VVaming 0 T 2 3 4 5 6 7 8 9 Pulse Board Error Command Varning Standard Event Status Register Operation Complete Request Control Query Error Device Dependent Error Execution Error Command Error User Request Power On AGW anang 40449 OPERation Status Output On M W Status Byte Service Request Figure 3 3 Status Reporting Diagram February 2014 19 LDP 3830 Status Reporting The status reporting model diagramed in Figure 3 3 is used to summarize the condition of the instrument down to the IEEE 488 1 defined status byte It also enables service requests Status Byte The status byte is composed of a status byte register and a service request enable register The status byte register contains the IEEE 488 1 STB and RQS MSS messages The bits in the status byte act as summary bits for the data structures residing behind them In the case of the MAV the status byte indicates that the output queue is not empty while the error queue indicates that there are unread errors The service request enable register is a mask that enables Service Request Interrupt SRQ to the host controller when the corresponding bit in the status
34. e register corresponds to a bit in the status byte register A service request is generated when a bit in either the service request enable register or the status byte register transitions from zero to one and the corresponding bit in the other register is either set to one or transitions from zero to one at the same time Chapter 3 has detailed information on status reporting Status Byte Register i RQS lt lt read by Serial Poll Service Request a 716 5 4 3 1 0 Generation lt read by STB 7 Operational Event Summary Bit 6 Service Request Master Status Summary Bit 5 Standard Event Status Summary Bit 4 Message Available Bit 3 Conditional Event Summary Bit 2 Error Queue Not Empty Bit 1 Not Used 0 Not Used Service Request Enable Register SRE lt integer gt SRE SRE 16 Enables the service request enable register to generate a service request when a query generating message is available to read from the output queue Service Request Enable Query Description Parameters Notes Examples STB Status Byte Query Description Parameters Notes Returns the enabled bits in the service request enable register None The response is a value between 0 and 255 representing the bits of the standard event status enable register when expressed in base 2 binary format SRE A res
35. e register to enable bit 5 of the status byte register if a device dependent error or a command error occurs 40 2 2 ESE Event Status Enable Query Description Determine the contents of the standard event status enable register Parameters None Notes The response is a value between 0 and 255 representing the bits of the standard event status enable register when expressed in base 2 binary format See ESR for a description of each bit in the status register along with a diagram of the reporting structure Examples ESE A response of 68 means the user request and query error bits have been enabled in the standard event status enable register 68 2 2 ESR Standard Event Status Register Query Description Determine the contents of the standard event status register Parameters None September 2011 27 LDP 3830 Notes Bit 0 oar wn Bit 7 Examples IDN Reading this register clears the contents The response is a value between 0 and 255 representing the bits of the standard event status register when expressed in base 2 binary format Standard Event Status Register ESR 7 s s5 4 3 2 o 0 Operation Complete 1 Request Control 2 Query Error 3 Device Dependent Error 4 Execution Error 5 Command Error 6 User Request 7 Power On To Status Byte Bit 5 7T s 4 3 2 1 o Standard Cvent Status Enable Register ESE lt nrf gt ESE
36. eevccee 16 Header Tree Traversal cccccccccccsessseeeencceeeeeeeeesseeeeeneeeeeesenseseeeeees 16 DOPAALOUS aeee trna cian ditais ssa E 17 Parameters siss seta tent avnieceeivalaceaatetaass tas NANE EAE AEAEE rake iSkin 17 Coupled Commands snnssseseneeeenneessettrrerterrtttttrsssrtrnnetrnnresnnnnnserrn nne 18 Status Reporting ton sash nck tia haa A tea ata iar tat EA bia Deh ae 20 Status Byle iaieiiea eg E A E ee lotta 20 Event RegS E S 22h tis cakes AR aa a tte bina wees based E SEEE AAEE ES Ee Siea 21 Standard Event Status Register ccsccceeeeesseeeeeeseneeeeeseneeeenees 21 QUE SUONADIS Stats nosso eceerae atte a NMA ek odsedeeebaaed 22 OP ERAGON Stat Sa nina ated a am cacti Madame eacelies 22 CG mmand TIMING essees trey me are tren a aa E arene Senet i mia tree REEE 22 Sequential Overlapped Commands ecceeeceeeeeeeeeeeeeeeeeeeeeenteeeeees 22 Query Response Timing ictesetncitactsieeoodstactrcineti nachos 23 Chapter 4 Command Reference ccccccccceceeeeeeeeeteteeeeees 25 Remote Command Reference SUMMALY ccceeeeeeeeeeeteeeeeeeeeeeteees 25 Command Reference ccccceccececeeecceeeeeeeeeeseecaaeeeeeeeeeeeeesennseeeeeeeeees 27 February 2014 ii LDP 3830 Chapter 5 Troubleshooting Troubleshooting Guide Error Messages Error Code Tables February 2014 iii LDP 3830 February 2014 iv LDP 3830 Safety and Warranty Information Y Details about cautionary symbols
37. erated Parameters lt seconds gt Tthe input trigger delay Notes The value must be between 0 and 655 35e 6 The resolution is 10ns and will be rounded to the nearest value If the SOURce PULSe DELay is longer that the pulse period there will be no output Reset Value 0 Examples DEL 0 000535 Sets the trigger in delay to 535 microseconds SOURce PULSe HOLD DCYCLE WIDTH SOURce PULSe HOLD Description Controls whether the pulse duty cycle or width parameter is held constant while changing the period Parameters Specifies which pulse parameter is held constant when the period changes Reset Value WIDTH Examples HOLD DCYCLE The duty cycle will remain unchanged when the period is changed SOURce PULSe PERiod lt seconds gt SOURce PULSe PERiod Description Controls the pulse period in seconds Parameters lt seconds gt The pulse repetition period when in immediate trigger mode Notes The seconds must be in the range of 500e 9 to 1e 3 This is a coupled command with SOURce PULSe DCYCle and SOURce PULSe WIDTh This command will change the parameter that is not defined in SOURce PULSe HOLD in order to set the new period Set points that cause the duty cycle or width to exceed their specified ranges will cause an execution error February 2014 35 LDP 3830 Reset Value 50 microseconds Examples PERIOD 2E 6 Sets the pulse period to be 2 us PER A responseof 0 0002 means that the period is 200 us
38. ery Only Measured front panel MEASure SCALar CURRent pulse current OUTPut STATe Switches pulse outputs on or off OUTPut DELay lt seconds gt Trigger out delay SOURce CURRent LEVel lt amps gt UP DOWN Pulse current setpoint SOURce CURRent LIMit lt amps gt Pulse current limit SOURce CURRent STEP lt amps gt Pulse current step size SOURce PULSe DCYCle lt percent gt Duty cycle Holds duty cycle or pulse width SOURce PULSe HOLD WIDTh DCYLe constant SOURce PULSe PERiod lt seconds gt Pulse repetition period SOURce PULSe WIDTh lt seconds gt Pulse width Query Only Read the Operational STATus OPERation EVEnt Event Register Bi Query Only Read the Operational STATus OPERation COND Condition Register ti n gt a n O As ti Ration ENABle lt integer gt Operational Event Enable Register Operational Status Negative n 3 El D J c n O U zal Ration NTRansition lt integer gt Transition Event Enable Register Operational Status Positive STATus OP eal Ration PTRansition lt integer gt Transition Event Enable Register Query Only Read the Questionable STATus QUESTionable EVEnt Event Register Pi Query Only Read the Questionable STATus QUESTionable COND Condition Register STATus QU M 3 Tionable ENABle lt integer gt Questionable Event Enable Register Ques
39. g see PSC is set to false disallowing service request interrupts after power on In the enabled state the enable registers are cleared during power on The power on status clear flag see PSC is set to true allowing service request interrupts after power on PSC 0_ Disable automatic power on clearing of the enable registers PSC 1 Enable automatic power on clearing of the enable registers Power on Status Clear Query Description Parameters Notes Examples February 2014 Requests the status of the power on status clear flag None Response 0 The enable registers are saved through power off on 1 The enable registers are cleared during power on Registers affected Condition Status Enable Service Request Enable Event Status Enable Standard Event Status Enable Operational Event Enable Questionable Event Enable See Chapter Four for more information on register structure PSC Requests state of power on status clear flag 29 LDP 3830 RCL lt bin gt Recall Description Recalls a stored setup configuration from memory Parameters A value from 0 10 Notes Bin 0 is the factory set default configuration The SAV function is used to save configurations for convenient recall The current setup is automatically stored and recalled at the next power on Examples RCL 0 response instrument is reconfigured to factory default settings RST Reset Description Performs a device reset Parameters None Notes
40. hen the output shuts off STATus QUEStionable PTRansition lt nrf value gt STATus QUEStionable PTRansition Description Parameters Notes Reset Value Examples February 2014 Controls the operational status positive transition filter register Value between 0 and 32767 representing the bits of the operational status positive transition filter register when expressed in base 2 binary format Causes the corresponding bit in the operational status event register to be set when the corresponding bit in the operation event condition register transitions from a 0 to a 1 There are eight bits used in the LDP 3830 Bit 0 Voltage Warning Bit 1 Current Warning Bit 2 Timing Warning Bit 5 Frequency Warning Bit 9 Pulse Board Error Bit 10 Interlock 1 Bit 11 Interlock 2 Bit 14 Command Warning 32767 STAT QUES PTR 256 Enables an event when the output turns on 39 LDP 3830 SYSTem ERRor NEXT Description Returns first error in the error queue The errors are identified by a number and string descriptor separated by acomma Refer to Chapter 4 for information regarding error handling and Chapter 6 for error code explanations Parameters None Notes The response data will be the first error in the queue Each time an error is read it is removed from the queue If the queue is first in first out if the queue overflows the last error is replaced with error 350 Queue overflow If the error queue
41. instrument status Each device has an address number and ignores all data traffic not addressed to it Depending on its content data is often called a device dependent message or a device dependent command Interface messages manage the bus with functions such as initializing the bus and addressing or unaddressing devices In addition some individual bus lines are designated for this purpose Talkers Listeners and Controllers Every GPIB system consists of one or more talkers and listeners and often at least one controller Talkers supply data Listeners accept data A system can consist of simply a talker and listener for example a meter connected to a datalogger or chart recorder Controllers designate talkers and listeners A controller is necessary when the active talkers or listeners must be changed When the controller is a computer it often also designates itself as a listener so it can collect data from designated talkers September 2011 13 LDP 3830 If there is more than one controller only one can be the Controller In Charge CIC Control can be passed from one computer to another In a multiple controller system there can be one System Controller capable of asserting control becoming CIC GPIB Cable Connections Standard GPIB connectors can be connected together stacked allowing the system to be configured linearly or in a star configuration Device A Device B Device C Device D Line
42. ion use or SYST ERR to read the latest error Error Code Tables The error codes are classified and placed in tables corresponding to their classification The classifications are Command Errors Execution Errors Device Errors Query Errors and Instrument Specific Errors Table 5 1 Command Errors Table 5 2 Execution Errors Error Code___ Explanation Data out of range Table 5 3 Device Errors Explanation Table 5 4 Query Errors Explanation Query interrupted Query unterminated Table 5 5 Instrument Specific Errors February 2014 44 LDP 3830
43. ion interval will automatically be adjusted to create the desired duty cycle In this mode pressing the PRI button will display the calculated pulse repetition interval in the right portion of the DOT Matrix display February 2014 9 LDP 3830 DC PW PRI 100 where DC is Duty Cycle in percent PW is Pulse Width in ns PRI is Pulse Repetition Interval in us PRI When the PRI LED is illuminated the instrument is operating in a constant pulse repetition interval mode where the instrument maintains a constant PRI for a set pulse width The duty cycle will automatically be adjusted to create the desired pulse repetition interval In this mode if the DC button is pressed the calculated duty cycle will be displayed in the right portion of the DOT Matrix display EXT When the EXT LED is illuminated the instrument will operate in External Trigger mode With an externally supplied trigger only the pulse width may be adjusted When the instrument is outputting a pulse the TRIG light on the display will be illuminated The DC PRI display mode is disabled in EXT mode Instead the repetition interval is determined by the rate of the TTL signal at the TRIGGER IN connector The LDP 3830 will limit the maximum duty cycle to 5 in order protect the LDP 3830 PULSE WIDTH Pressing the PULSE WIDTH button allows the user to adjust the pulse width of the LDP 3830 The pulse width will be displayed in right portion of the DOT Matrix display Note
44. is empty then 0 No error will be returned CLS shall clear the error queue Reset Value RST does not affect the error queue Examples ERR A response of 0 No error n means that no errors have been reported SYSTem PRESet Description Performs a device reset and sets the OCIS and OQIS states Parameters None Notes Performs the same function as RST SYSTem PTYPe Description Reads the pulse board ID string Parameters None Notes Querying the pulse board ID string when no pulse board is connected will generate error 531 Pulse board not connected Examples SYST PTYPE A response of ILX Lightwave LPB 386 3861001 0 n means a LPB 386 Pulse board with serial number 3861001 is connected SYSTEM PTYPE A response of ILX Lightwave 0 0 0 n means that no pulse board is connected TRIGger SOURce IMMediate EXTernal TRIGger SOURce Description Configures the source for pulse generation Parameters IMMediate Pulses are generated based on the timing signal coming from the period command EXTernal A pulse is generated on the rising edge of the trigger in signal Notes SOURce PULSe DELay sets the delay between the trigger in and the pulse output when using an external source If the trigger input occurs that would cause the output to violate the maximum 5 duty cycle that trigger edge will be ignored and a pulse will be generated on the next trigger edge that won t violate the duty cycle specification Reset Value I
45. knob To set the value press the SET button or leave the adjust knob untouched for three seconds The STORE and RECALL parameter functions are used to store and retrieve instrument configurations Non volatile memory is used for saving the instrument parameters When a store operation is performed all of the instrument parameters currently in effect are stored to a bin number 1 10 When that bin number is recalled the instrument configuration is recalled to the stored values To enter the STORE RECALL mode press either the STORE or RECALL button which will display the current bin number in the bottom of the screen The current bin number will be flashing and the ADJUST knob can be used to select a new bin The store or recall operation is performed when the SET button is pressed If the SET button isn t pressed after three second the LDP 3830 will time out and the new bin number will not be stored or recalled Pulse The PULSE section contains the PRI button DC button EXT button PULSE WIDTH button CURRENT button and ON button Each button function is described below To change between control modes constant PRI DC EXT press the corresponding button twice The output will automatically be disabled DC When the DC LED is illuminated the instrument is operating in a constant duty cycle mode where the instrument maintains a constant duty cycle for a set pulse width The pulse repetit
46. meout after 3 seconds if the ADJUST button is pressed after the timeout the previous setting can be adjusted February 2014 8 LDP 3830 Setup The SETUP button box contains the SET button PARAM button RECALL button and STORE button Pressing the PARAM button cycles through each of the available parameters and displays them on the dot matrix screen The parameter menu items are Current Limit Trig In Delay Trig out Delay GPIB Address and Brightness all of which are described below Current Limit Used to define the maximum pulsed laser current If the limit is exceeded the output will turn off and an error message will be displayed Trig In Delay Adjusts the delay between the time when the LDP 3830 receives an external trigger signal and when the LDP 3830 initiates a corresponding output current pulse Trig Out Delay Adjusts the delay between the time when the LDP 3830 sends a TTL trigger signal out and when the LDP 3830 outputs a current pulse GPIB Address Sets the GPIB address from 1 to 30 Brightness Sets the display brightness from 1 to 10 The items in the setup menu automatically time out after three seconds of no activity and the instrument will return to its default measurement display mode To adjust a parameter value first press the PARAM button until the appropriate parameter is shown and immediately press SET The units will begin to flash on the display and the parameter can then be adjusted by the ADJUST
47. n COND Description Read the operational status condition register Notes This will report the current status of the two enabled operation condition bits Bit 1 Settling the current pulse width or period is settling on the setpoint Bit 8 Output On the output is currently on Use the STATus OPERation NTRansition and STATus OPERation PTRansition filters to enable the associated event register Reset Value 0 Examples STAT OPER COND response 256 means that the output is currently on February 2014 36 LDP 3830 STATus OPERation ENABle lt integer gt STATus OPERation ENABle Description Parameters Notes Reset Value Examples Controls which OPERation events causes summary bit 7 of the status byte to be set Value between 0 and 32767 representing the bits of the operation event enable register when expressed in base 2 binary format When a bit in this register is set along with the corresponding bit in the operation event register bit 7 will be set in the status byte This register is cleared at power on when PSC is set to 1 There are two bits used in the LDP 3830 Bit 1 Settling can be used to determine when the current pulse width or period is done settling event has occurred Bit 8 Output On can be used to determine when the output on off event has occurred Not Affected by RST STAT OPER ENAB 256 Enables the Output On events report to the status byte STATus OPERation NTRansition lt integer gt
48. n the LDT 5948 and LDT 5980 products Additionally the connector can also be used as a normally closed interlock The interlock is pulled high using a weak internal pull up resistor wherefore a short circuit will cause the output to be disabled Interlock 2 provides a normally open interlock it requires a short circuit between the two terminal blocks on the rear panel for proper operation These terminal blocks are intended to be used with door or cover interlocks incorporating a normally open mechanical or reed relay The LDP 3830 is shipped with a wire across this connector so the instrument will not need any additional configuration as received Connecting to the Laser The laser may be soldered directly to the tabs on the output of the pulse board Note the polarity on the cover of the LPB 386 The pads on both the top side and bottom side of the board are available to connect to support various device connections See ILX Lightwave technical note LDP 3830 Connecting Your Laser for additional information on connecting to the LPB 386 February 2014 7 LDP 3830 Front Panel Operation This section describes the fundamentals of operation for the LDP 3830 Precision Pulsed Current Source The order of descriptions will follow the normal progression of how a user would typically configure the instrument for the first time LX Lightwave LDP 3830 PRECISION PULSED CURRENT SOURCE FINE DISPLAY ADJUST are SETUP MODE ADJUST HOLD ADJ
49. ng on the setpoint Bit 8 Output On creates an event when the output turns on 32767 STAT OPER PTR 256 Enables an event when the output turns on 37 LDP 3830 STATus QUEStionable EVEnt Description Notes Examples Read the questionable event register This register requires that the associated PTR or NTR filters are set before the condition register bit can set the event register The data in this register is latched until it is queried Querying the register clears the data ensuring that no events are missed between subsequent reads of the register CLS will also clear this register There are eight questionable events enabled in the LDP 3830 Bit 0 Voltage Warning Bit 1 Current Warning Bit 2 Timing Warning Bit 5 Frequency Warning Bit 9 Pulse Board Error Bit 10 Interlock 1 Bit 11 Interlock 2 Bit 14 Command Warning See Figure 3 2 for a description of the questionable status registers STAT QUES A response of 2048 means that there has been an Interlock 2 event STATus QUEStionable COND Description Read the questionable status condition register Notes This will report the current status of the eight enabled questionable condition bits Examples Bit 0 Voltage Warning means the compliance voltage of the device won t allow the current to get to set point Bit 1 Current Warning means the current is not at the set point due to device conditions Bit 2 Timing Warning means the internal
50. ng the PULSE WIDTH button Then turn the ADJUST knob to set pulse width e Turn the output on by pressing the ON button After a 2 second delay the output on sequence will start with a slow ramp during which the LDP 3830 will automatically drive the laser to the set point current e While the output is on the laser drive current set point and limit may be changed Also the pulse width and or duty cycle percentage may be adjusted If the pulse width is changed the duty cycle percentage range may be automatically limited if required due to the limitations of the resolution of the PW and PRI values February 2014 11 LDP 3830 e If the mode of operation DC PRI EXT is changed the OUTPUT will be automatically turned off Pulse Current Limit The pulse current limit will have to be always set higher than your maximum setpoint The combined accuracy of the setpoint and the current limit circuitry can cause a current limit even when the current limit is set 100mA above the current setpoint Furthermore in the case of an inductive load at short pulse widths the LDP 3830 will compensate for low pulse amplitude at the rising edge and cause the middle of the pulse to rise above the setpoint value in order to maintain the configured average pulse amplitude February 2014 12 LDP 3830 Chapter 3 Remote Operation This chapter is an overview of the remote operation of the LDP 3830 Precision Pulse Current Source Remote Operation C
51. nt will set the corresponding status bit when this transition occurs Commands that change the status of the instrument are restored at power up and will not have their OPC flag set until all of the current writing to the non volatile memory has been completed February 2014 22 LDP 3830 Query Response Timing Query responses are evaluated at the time the query request is received and not at the time the response message is sent In most cases this does not create a problem since the time between parsing a query and sending its response is small February 2014 23 LDP 3830 February 2014 24 LDP 3830 Chapter 4 Command Reference This chapter is a guide to all of the device dependent commands for the LDP 3830 Precision Pulse Current Source This chapter is divided into two parts Y Overview of the remote commands Y List of remote commands in alphabetical order Remote Command Reference Summary This section contains all of the commands for the LDP 3830 Precision Pulse Current Source listed in alphabetical order Table 4 1 contains a list and a description of each IEEE 488 1 common command Table 4 2 contains the instrument specific commands Unless otherwise noted each of the instrument specific commands has a corresponding query without a parameter See Figure 4 4 for the command path tree structure Table 4 1 Remote Command Summary of IEEE 488 1 Common Commands Command Syntax Function CLS Resets
52. ommand Tree Structure Y Status Reporting Command Timing Remote Operation Test and measurement equipment with remote operation capability will generally communicate through either GPIB or USB interfaces GPIB General Purpose Interface Bus is the common name for IEEE Standard 488 1 an industry standard for interconnecting test instruments in a system USB Universal Serial Bus is the most common serial communication protocol used by computers today Everything that can be done from the front panel can also be done remotely and in some cases with more flexibility For instance in remote mode there is access to functions and modes not available from the front panel such as commands that will increment CURRent UP or decrement CURRent DOWN the current setpoint by a predefined step value The following sections explain the fundamentals of operating the LDP 3830 Precision Pulse Current Source remotely through either the GPIB or USB interface Basic GPIB Concepts The information in the Basic GPIB Concepts section is normally not necessary to successfully operate the LDP 3830 through its GPIB interface because the host computer s GPIB controller usually handles the details however it is a useful perspective in understanding GPIB Data and Interface Messages GPIB devices communicate with each other by sending data and interface messages Data contains device specific information such as programming instructions measurement results and
53. onses Current in amps Notes Useful during a slow trigger to determine where in the ramp on the current is set Examples MEAS CURR A response of 1 00 means that the instrument is measuring 1 Amp of pulsed current OUTPut STATe ON OFF 1 0 OUTPut STATe Description Controls whether the output is enabled or not Parameters ON 1 Turns the output on OFF 0 Turns the output off Notes This is an overlapped command and has a two second delay on turn on Turn off is immediate The output on bit 8 in the operation status register can be used to determine the actual point that the output is turned on or if it has automatically shut off due to an error condition Additionally OPC Or WAI may be used to determine the time when the output reaches setpoint Reset Value OFF Examples OUTP A response of 0 means that the pulse output is off OUTP ON Enables pulse output OUTPut DELay lt seconds gt OUTPut DELay Description Sets the delay between the output pulse and the trigger out Parameters None Notes The value must be between 0 and 655 35e 6 The resolution is 10ns and will be rounded to the nearest value There will be no trigger out signal if the delay is longer than the period of the pulse signal February 2014 33 LDP 3830 Reset Value 0 Examples OUTP DEL 0 00035858 Sets the trigger out delay to 358 58 microseconds OUTPUT DELAY A response of 4 704E 05 means that the trigger out delay output is 47 0
54. ously Monitored Event Registers Event registers capture changes in conditions Each event bit in an event register corresponds to a condition bit in the condition register or if there is no condition register to a specific condition in the instrument The event will become true when the associated condition makes a defined transition The bits in the event register latch once they are set meaning that they are not cleared until they are read by the application The event register guarantees that the application cannot miss an event that occurs between the reading and clearing of an event register Event registers also have a corresponding event enable register that determine which bits in the corresponding event register will cause a true summary message when set Once set the summary is passed down to the status register Event registers cannot be directly written to and they are cleared when read or sent the CLS common command Condition Register Positive Transition Filter sE g Edge Negative Transition Filter Creates E Event Register Latched Conditions Logical AND of latched event condition bit with ing ever Logical OR Event Enable Register elects which Events can set the Summary Message Y Summary Message Figure 3 4 Event Register Diagram When an event register also has a corresponding condition register there is a Positive Transition Register PTR and Negative Tr
55. ponse of 16 signifies that the message available summary bit is enabled Returns the value of the status byte register None The response is the sum of the enabled bits and must be a value between 0 and 255 February 2014 31 LDP 3830 Status Byte Register ROS lt read by Serial Poll Service Request hatos 7 6 5 4 3 1 0 Generation lt read by STB A f Se 7 Operational Event Summary Bit i 6 Service Request Master Status Summary Bit 5 Standard Event Status Summary Bit 4 Message Available Bit 3 Conditional Event Summary Bit 5 2 Error Queue Not Empty Bit 3 1 Not Used 3 0 Not Used Service Request Enable Register SRE lt integer gt SRE Examples STB A response of 200 specifies that the laser condition summary master status summary and error available bits are enabled TST Self Test Description Performs an internal self test and then reports results Parameters None Notes Response 0 test completed with no errors Response 1 test completed with errors This is a synchronous command and will block other commands from execution until it has completed Examples TST A response of 0 means test completed without errors WAI Wait to Continue Description Prevents the instrument from executing any further commands until all pending operations are complete Parameters None Notes This command can be
56. s alia nn Aaaa alae aT eE aN ae eds 9 General Operating ProCeCUures cccccceeeesseeeceeeeeeeeeeetessneeeeeeeees 11 Warm Up and Environmental Considerations cccccceeeeees 11 Pulse Mode Operation cicesedecessreseranseceuecdevesettnsasueasdeensdeteunetedeeeesoeaetes 11 Pulse Current LIMI nouastacs catia a OEE EA 12 Chapter 3 Remote Operation ccccceccceecseeceeeceeeceeeeeeeeees 13 Remote Operation da oiee raerecsiice ascend petites Did tad Goce deetaide dace duets nnen 13 Basic GPIB Concepts perenni R EEA 13 Data and Interface Messages cccceeeeeeeeeeeseeeeeeeeeeeeenseeeeeeeeees 13 Talkers Listeners and Controllers ccccccccssseseeceeeeteeeeeeesseeeeeeees 13 GPIB Cable Connections ai ccecenyscceesseeeconcesasccansengdeeee a tuaeteettetetasene 14 Reading the GPIB Address saieiantcascsnnncnieccncntiue Qealeattidndagy hhunae iets 14 Changing the GPIB Address 0 22t2taten te oe ane 14 Basic USB CONC PIS eere aaa a Eaa E E a ARES 14 Changing Operation from Local to Remote c cceeeeeeeeeeeeteeeeeees 14 GPIB vs USB Communication s sssseseseeseseeeserrsssrrrrrerennresrerrssrrrnne 15 Syntax Summae ea ea e ea a 15 Pr gram HO AUCIS xieret cen deauaaiianntnatenchsnubsyedetvehweaden he e a eaa 15 488 2 Common Program Headers cccccceeeeeeeeeeeeeeeeenteeeeeessneeeees 15 Command Tree Structure icxse see Geate vase cas eevdcerelasscaicees cdasiveeetgevent ec g
57. sed in base 2 binary format When a bit in this register is set along with the corresponding bit in the questionable event register bit 3 will be set in the status byte This register is cleared at power on when PSC is set to 1 February 2014 38 LDP 3830 There are eight bits used in the LDP 3830 Bit 0 Voltage Warning Bit 1 Current Warning Bit 2 Timing Warning Bit 5 Frequency Warning Bit 9 Pulse Board Error Bit 10 Interlock 1 Bit 11 Interlock 2 Bit 14 Command Warning Reset Value Examples Not Affected by RST STAT QUEST ENAB 16384 Command Warning events report to the status byte STATus QUEStionable NTRansition lt integer gt STATus QUEStionable NTRansition Description Parameters Notes Reset Value Examples Controls the operational status negative transition filter register Value between 0 and 32767 representing the bits of the operational status negative transition filter register when expressed in base 2 binary format Causes the corresponding bit in the operational status event register to be set when the corresponding bit in the operation event condition register transitions from a 1 to a 0 There are eight bits used in the LDP 3830 Bit 0 Voltage Warning Bit 1 Current Warning Bit 2 Timing Warning Bit 5 Frequency Warning Bit 9 Pulse Board Error Bit 10 Interlock 1 Bit 11 Interlock 2 Bit 14 Command Warning 0 STAT QUES NTR 256 Enables an event w
58. sition of bistable push control Off Out position of a bistable push control The slash only denotes that mains are on O It The circle O only denotes that mains are off Warranty ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period ILX will repair or replace the unit at our option without charge Limitations This warranty does not apply to fuses lamps defects caused by abuse modifications or to use of the product for which it was not intended This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for any particular purpose ILX Lightwave Corporation shall not be liable for any incidental special or consequential damages If a problem occurs please contact ILX Lightwave Corporation with the instrument s serial number and thoroughly describe the nature of the problem February 2014 vii LDP 3830 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service be sure to Repairs are made and the instrument returned transportation pre paid Repairs are warranted for the Obtain a Return Authorization number RA from ILX Customer Service Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from the rear panel
59. stment The LDP 3830 has front legs that extend to make it easier to view the displays To use them rotate the legs downward until they snap into position Rack Mounting The LDP 3830 conforms to international standards for a 2U height 1 2 width rack mounting Available rack mount accessory kits contain detailed mounting instructions Laser Connections The LPB 386 Laser Pulse Board must be connected to the LDP 3830 unit using the provided CC 385 cable To limit potential damage to the LPB 386 and the device under test it is important to screw the connector into both the LDP 3830 and the attached LPB 386 LDP 3830 Pulse Board February 2014 6 LDP 3830 Current Monitor on the LPB 386 Current Monitoring is provided via an SMB connector on the top of the LPB 386 Selection is configured by a switch providing positions for current monitor and off With the switch in the off position the SMB connector is isolated from the laser In the current monitoring position earth grounding of the laser anode or cathode will result in inaccurate current measurements and possible laser damage When using the current monitor ensure the attached equipment is set to 50 ohm termination to achieve the rated accuracy of the LDP 3830 Interlock Connections Interlock 1 is intended for interfacing with a TTL control signal Operation is normal in the low state but the output will be disabled when in the high state This is compatible with the Trigger Out connector o
60. t be returned to ILX Lightwave for repair Unit Reads Cable Interlock Check to ensure the CC 385 cable is securely screwed to both the LDP 3830 and LDP 386 A loose CC 385 cable can cause permanent damage to either the LDP 386 or laser The cable interlock is extremely sensitive in order to detect cable disconnects as soon as possible therefore additional cable interlock errors can result from changing the monitor switch during operation or electro static discharge onto the cable or the LPB 386 pulse enclosure To prevent potential damage to the laser ILX advises turning the output off prior to changing the monitor switch Output is not tracking the external Check the trigger in delay If it is larger than period that trigger you are sending pulses then there will be no pulses on the output Make sure that your trigger in is at the proper level If the signal is too low it may not detect the signal Check to make sure that you are not providing a trigger in signal that violates the 5 duty cycle Triggers that occur within the 5 duty cycle window will be ignored Instrument is displaying multiple errors This usually is due to multiple faults detected at the same at once time such as Interlock 1 closed and Interlock 2 open at the same time If there are multiple errors including Internal February 2014 42 LDP 3830 Can t adjust using the front panel Pulse Board Error February 2014 Communication Error it of
61. ten means that there was a brown out that caused the pulsing subsystem to reset but didn t shut down the instrument completely Cycle the power to correct this issue Due to command coupling you may be violating the constraints of another parameter For instance if you are in hold PRI mode and the PRI is set to 500ns and you try to adjust the pulse width it will seem to be stuck at 25ns because 25ns is the lower limit for pulse width and any higher pulse width would violate the 5 duty cycle limitation Adjust the PRI to a higher value first than pulse width can be adjusted If the unit has been remotely operated the Recall Local button in the lower left of setup section needs to be pressed in order to return the unit from remote operation and allow the front panel to work The adjustment knob has a three second timeout of inactivity If this period has elapsed the Adjust led will de illuminate To re enable adjustment either press the parameter button again or press the button under the Adjust led This error is cause if a LPB 386 is not connected to the CC 385 cable or if there is a loose connection Ensure the LPB 386 is connected and the CC 385 is firmly connected to the output connectors If this problem persists please contact ILX Lightwave for further assistance 43 LDP 3830 Error Messages Error messages may appear on the LDP 3830 display when error conditions occur in the instrument In remote operat
62. the Standard Event Register Status Byte and Error Queue to zero ESE lt integer gt Sets the Standard Event Status Enable Register ESE Returns the value of the Standard Event Status Enable Register ESR Returns the value of the Standard Event Status Register IDN Returns the Device Identification string OPC Generates the Operation Complete message in the Standard Event Status Register OPC Places an ASCII character 1 into the Output Queue PSC Used to avoid any undesirable service requests PSC Queries the Power On Status Clear Flag RCL lt integer gt Used to recall a stored setup configuration RST Forces a device reset SAV lt integer gt Saves the current setup configuration Sets the Service Request Enable Register bits to allow generation of user SRE lt integer gt h selectable service requests SRE Returns the current contents of the Service Request Enable Register STB Returns the current contents of the Status Byte Register TST Initiates an internal self test and returns a response when complete Prevents executing any further commands until the No Operation Pending WAI flag is true February 2014 25 LDP 3830 Table 4 2 Instrument Specific Command Summary Reference List Name Function DISPlay WINDow STATe ON OFF 1 0 Toggles the display on off Response format for status subsystem FORMat SREGister ASCii BINary HEXadecimal OCTal data Qu
63. tionable Status Negative STATus QUESTionable NTRansition lt integer gt Transition Event Enable Register Operational Status Positive STATus QUESTionable PTRansition lt integer gt Transition Event Enable Register Query Only Returns first entry in SYSTem ERRor NEXT error queue SYSTem PRESet No Query Instrument reset Query Only Returns Pulse Board SYSTem PTYPe information TRIGger SOURce IMMediate EXTernal Sets the pulse repetition source February 2014 26 LDP 3830 Command Reference The following pages contain a reference for both common and device dependent commands of the LDP 3830 Precision Pulse Current Source CLS Clear Status Description Clears all status event registers and the error queue Notes Useful to clear registers before enabling service requests SRQ Example CLS ESE lt integer gt Standard Event Status Enable Description Sets the bits in the standard event status enable register Parameters The value must be between 0 and 255 Notes The integer sent as a parameter is expressed in binary form when an event occurs in the standard event status register that matches the corresponding bit in the standard event status enable register bit 5 will is enabled in the status byte register See ESR for a description of each bit in the status register along with a diagram of the reporting structure Examples ESE 40 Sets the standard event status enabl
64. tor Output Impedance Voltage Measurement Ratio Current Measurement Ratio February 2014 50Q 200 V V 2 AN LASER DIODE PROTECTION Output Shorting Relay LPB 386 Pulse Current Limit Transients Operational 1 kV EFT Surge AC Power Normally closed Adjustable redundant hardware lt 5 amplitude increase lt 5 pulse width change Failure Brown Out lt 5 duty cycle change INTERLOCK INPUT Interlock 1 Normally open close to enable output Interlock 2 TTL weak internal pull up normally high pull low to disable GENERAL LDP 3830 Power Requirements 100 to 240 VAC 50 60 Hz Size HxWxD 102 mm x 216 mm x 356 mm 4 0 x 8 5 x 14 0 Weight 3 80 kg 7 45 Ibs Operating Temperature 10 C to 40 C Storage Temperature 40 C to 70 C Humidity lt 85 Regulatory CE certified Interface GPIB IEEE488 1 USB 2 0 GENERAL LPB 386 Size HxWxD 114 mm x 114 mm x 38 mm 4 5 x 4 5 x 1 5 Weight 0 42 kg 0 91 Ibs Operating Temperature 10 C to 40 C Storage Temperature 40 C to 70 C Humidity lt 85 Regulatory CE certified NOTES Specifications are for a one hour warm up 1 Repeatability is measured as the standard deviation over 100 samples at 50 of amplitude 2 Measured for set points above 0 6A Dependant on device forward voltage and parallel capacitance See TN 3830 1 Pulsed Performance of the LDP 3830 for additional information pulse overshoot
65. ulse width while maintaining the respective control mode Laser diode protection features include programmable current limit output shorting relay AC line filters and double shielded transformers to help suppress AC line transients Testing and characterization can be automated with the 3830 through the GPIB IEEE 488 1 or USB 2 0 interface For basic system integration without an automated program a trigger in out can be used to control pulses and initiate corresponding measurements e Pulsed current output up to 5A e 20V compliance voltage e Adjustable pulse width from 25 ns to 1 us e Adjustable duty cycle from 0 01 to 5 00 e Pulse trigger in out e Current monitor connection e Laser diode protection including current limits transient protection and shorting relay e Safety interlocks compatible with temperature controller over temperature output e USB and GPIB computer interfaces Lightwave LDP 3830 PRECISION PULSED CURRENT SOURCE FINE DISPLAY ADJUST rer SETUP MODE ADJUST HOLD ADJUST SET Panna om PRI PULSE WIDTH PRESS TWICE oc CURRENT 1 l O RECALL STORE J a a e ext on Figure 1 1 LDP 3830 Front Panel February 2014 2 LDP 3830 HEH ILX Lightwave MAN MONTANA SITIS USA Figure 1 2 LDP 3830 Rear Panel Options and Accessories Options and accessories available for the LDP 3830 Precision Pulsed Current Source include the following Model Part Number Description LPB 38
66. used to make the instrument wait until an operation is complete before continuing Care should be taken to set the time out appropriately for use with the WAI command After this command is sent the instrument may block subsequent commands waiting for the input queue to empty Examples OUTPUT ON WAI MEAS CURRENT The current measurement will occur after the output is on DISPlay WINDow STATe ON OFF 1 0 DISPlay WINDow STATe Description Controls whether the display is visible Parameters ON 1 Display is on OFF 0 Display is off Reset Value On February 2014 32 LDP 3830 Examples DISP ON Turns on the VFD display DISP WINDOW STATE A response of 0 means that the VFD display is turned off FORMat SREGister ASCii BINary HEXadecimal OCTal FORMat SREGister Description Sets the data type of the response to queries for status subsystem registers Parameters ASGii ASCII standard numeric format BINary Encoded as numeric base 2 preceded by B HEXadecimal Encoded as numeric base 16 preceded by H OCTal Encoded as numeric base 8 preceded by Q Notes All status condition and event requests respond in the selected radix Reset Value ASCii Examples FORMAT SREG BIN STB May respond with B11001 FORMat SREGister A response of HEXIDECIMAL means status subsystem responses will be in hexadecimal encoding MEASure SCALar CURRent Description Reports measured pulse current Resp
67. utions and troubleshooting visit the www ilxlightwave com Support page www ilxlightwave com support index html and the Library page www ilxlightwave com library index html for Application Notes and Technical Notes February 2014 41 LDP 3830 Troubleshooting Guide This section lists some common problems and corrective actions The corrective actions may not solve the problem in which case you should contact ILX Lightwave For a comprehensive list of frequently asked questions see the ILX Lightwave website or contact ILX Lightwave Customer Service see Comments Suggestions and Problems on page viii for contact information Symptom Corrective Action The instrument does not power up Check the power cord to make sure that it is properly connected and check the wall outlet by connecting to operational instrument Check the rear panel marking to make sure that the unit is configured for the line voltage applied Improper line voltage will cause the internal fuses to blow and it will need to be returned to an ILX Lightwave service center for repair Unit Reads Current Limit This is due to a current limit See the end of chapter 2 for an explanation of the current limit Unit Reads Internal Communication E 555 is the internal communication error indicating that Error the LDP 3830 platform is not functioning correctly Often this may be corrected by cycling the power If the problem persists the instrument mus
68. uts may be used Each level of the tree is traversed by placing a colon between each keyword root node DISPlay OUTPut SOURce MEASure STATus System TRIGger FORMat Sas ae WINDow crate CURRent PULse SA ar lopERation QUESTionable PRESet SOURce sREGister DELay PTYPe A x ERRor iy STATe LEVel DELay CURRent meie ie 2 2 sees ied re 7 EVEnt COND NEXT i PERiod COND ENAB1le ENAB1le NTRansition wipTth NTRansition PTRansition PTRansition Figure 3 2 Command Tree Structure Header Tree Traversal Multiple Commands Queries can be sent in a message The first command is always referenced to the root node however subsequent commands are referenced to the same tree level as the previous command Preceding a program header with a colon returns the parser back to the root node Insertion of acommon command has no effect on the position of the parser within the tree February 2014 16 LDP 3830 For example the following commands behave as described e SOURCE CURRENT LEVEL 2 5 LIMIT 3 will set the current setpoint to 2 5A and the current limit to 3 amps e SOURCE CURRENT LEVEL 2 5 WIDTH 100e 9 will set the current to 2 5A and generate an error because WIDTH is not a node at the current parser level e SOURCE CURRENT LEVEL 2 5 WIDTH 100e9 will set the current to 2 5A and the pulse width to 100 ns since the returned the parser
69. when the controller is in remote operation mode When the instrument is in remote mode all front panel controls are disabled except for the RECALL LOCAL February 2014 14 LDP 3830 button Pressing the RECALL LOCAL button returns the instrument to Local control mode unless the Local Lockout mode has been activated by the host computer Local Lockout disables all front panel controls including the RECALL LOCAL button until this condition is changed by the host computer When the instrument is placed in Local Lockout Mode by the host computer the remote indicator will illuminate on the VFD display GPIB vs USB Communication The USB port follows the USB Test and Measurement Class USB488 Subclass Specifications Due to the physical hardware differences broadcast and multicast messages along with SRQ interrupts are not available over the hardware In these cases the software controlling the instrument can replace these GPIB hardware commands with functionally equivalent alternatives You can review the USB Test and Measurement Specification and the USB488 Subclass Specification from the www usb org website Syntax Summary Each IEEE 488 1 Command Query is composed of a program header and optional program data Program Headers All program headers consist of one or more keywords since they are based on a hierarchical structure also known as a tree system To obtain a particular command the full path to that command must be specified Square br

LDP-3830 Precision Pulsed Current Source

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