485 LaserPak User`s Manual
Contents
1. S MANUAL USER LASER DIODE DRIVER P lt arroyo INSTrUMENIS Page 2 LaserPak User s Manual Table of Contents INtFODUCUON isena naa ed eid se iin tise 3 Safety Terms and SyMbOIS 0 ccccceceeeceeeee cece eeeeeeeeeeeeceneeesaeeesaaeseeeeeeeeees 5 QUICK STATU iehic sie vsti eee anar EAEE aie cities NANEN EE EAEE 7 ASC ATOM a ch pce E xe ak pcan cee ad Leak ea hens A E ET 8 Control Mod ES ii i2hic iid dstindi hinds Eaa E E 10 SENGS sos gross ecu tate e ca cd canes a a A E Gas Sidede 12 Cable Wiring for Modulation eceeeceeeeeeeee teens eeeeeeeeneeeeaaeeeeaeeeeeeeeeaas 14 Using the Cable R Setting cccccceeceeeceeeeeeeneeeeeeseeeeescaeeesaeeeseeeeeaees 14 Remote Mode Operation cccccceeeeeeeeceeeeeeeaeeeeeeseeeeescaeeesaeeeeeeeenaees 16 Installing the USB Drivers 0 0 cccccceceeeeeee cette eae eeeaeeseeeeesaeeeeaaeseeeeeeeaees 16 Interface CONNECTIONS cccececeesse cesses eeeceeceseeeeaaeseeaeeseeeesaaeeeeaaesneeeeenaes 16 Connecting to the LaserPak cccsceeeeeeeeeeeeeseeeeeeeeseeeetaesteaaeseeeeetaas 19 Working With Thermistors ccceessceeeeesneeeeeeneeeeeeeeeeeeaeeeeeeaeeeeneaas 20 Using the Analog Interface ecccccceeeseeceeeeeeeee teense seeeeeteaeeetaaeseeeeeenaees 21 Grounding Considerations cccccccceeeeeeeee sees ceeeeeeeneeesaeeteaeeseneeenaas 24 Photodiode Input Considerations cccccccceeeeeseeeeeeeeseeeesaeeeeeeeeaees 242. LaserPak and supports the rack mount of up to five units in either a 2U or 3U high opening depending on the orientation of the LaserPak Because the units only ventilate from the front and rear no air gapping is required above or below the units and they can be rack mounted immediately above other equipment no rack spacers required Warm up and Environmental Considerations In order to achieve the highest level of accuracy the LaserPak should be powered on for at least one hour prior to taking measurements In addition ensure that the unit is not operating outside the ambient temperature range or humidity conditions Control Modes The LaserPak offers five laser control modes lo ACC lo HiBW ACC Im AMC Po APC and Vf AVC Changing the control mode is done through the Arroyo Control by changing the Mode setting lo and lo HiBW modes referred to collectively as ACC or automatic current control modes are used to drive a specific current through the laser diode When in this mode the set point will be in milliamps and the LaserPak will drive the desired current through the laser diode as long as the voltage at the chosen LaserPak User s Manual Page 11 set point does not exceed the voltage limit In lo mode you will be limited to less than a 10 Hz bandwidth To modulate above that rate use the lo HiBW which is a high bandwidth current mode supporting modulation Im mode also referred to as AMC or automatic
3. The error code is non specific and is generally used when no other error code is suitable The message is too long to process USB Serial only The message used an invalid path command USB Serial only The message contained data that did not match the expected format USB Serial only The message attempted to set a value that was outside the allowable range USB Serial only When trying to parse the message the data was in an invalid format USB Serial only An invalid number base suffix radix was encountered when parsing a number USB Serial only The interlock input pins 1 and 2 of the output connector were not shorted when the output was on The laser output was turned off because a current limit was detected and the corresponding bit in the OUTOFF register was set The laser voltage exceeded the voltage limit and the output was turned off The laser output was turned off because a photodiode current limit was detected and the corresponding bit in the OUTOFF register was set The laser output was turned off because a photodiode power limit was detected and the corresponding bit in the OUTOFF register was set The laser output was turned off because a short condition was detected and the corresponding bit in the OUTOFF register was set The laser output was turned off because an out of tolerance condition was detected and the corresponding bit in the OUTOFF register was set A hardware control error was detected w
4. WS IG LIMIS cen aA A 25 Thermal Considerations cccccccceeeeceeeeeeee eens eeeeaeeeeeeeseeeesaaeeteaaeeeeeeees 26 RS 816 1 orc a nicer ener fret a a E A E creer ee 27 Error M SSAQ S tsiiiaieseeceveceendnlvessnncees ssadlisbustinees aednliezennntesaadiaineannesaedey 28 Mechanical Drawings sersan 29 Changing the AC Line Voltage Setting cceeceeeseeeeeeeseeeeeeneeeeeeeeaee 31 Maintenance and ServiCe ccccccccccccccccccssseseeecccceesseeauaeueeeseeesueanaaueeeeess 34 LaserPak User s Manual Page 3 Introduction Thank you for choosing the LaserPak from Arroyo Instruments Your LaserPak is a combination of leading edge technology combined with years of experience in the field of current control and based on the proven designs found in the 4200 and 4300 Series LaserSources The LaserPak was design for system integration applications or simply where a user interface like that found on the 4300 Series LaserSource is not required or desired With a range of power options both RS232 and USB computer interfaces analog interface and small footprint the LaserPak will fit into almost any current control application LaserPak s analog interface provides a way of both controlling and monitoring the instrument with analog set point current and photodiode current monitoring stable indicator and on off control and status This allows for control in applications that do not have a computer interface In additio
5. 0 5 0 001 0 05 0 005 lt 50 1 hour lt 100 0 10V 10kQ 65kHz 50kHz 40kHz 0 1 0 1 0 5 0 05 0 4 0 05 0 8 0 05 1 6 0 001 0 05 0 004 1 0 05 2 1 20 40 80 0 1 2 5 DB 9 female On LDD connector USB 2 0 Full Speed Type B RS 232 DB 9 male 115VAC 230VAC internally selectable 50 60 Hz 3 0 77 x 4 5 115 x 8 5 10 C to 40 C 20 C to 60 C Pl a r0y0 INSTrUMENTS Page 28 LaserPak User s Manual Error Messages Error Code E 100 E 102 E 123 E 124 E 201 E 202 E 204 E 501 E 504 E 505 E 506 E 507 E 509 E 510 E 511 E 512 E 514 E 516 E 517 E 534 E 535 E 537 E 998 E 999 Description General Error Message too long Path not found Data mismatch Data out of range Invalid data type Suffix not valid Interlock shutdown output Laser current limit disabled output Laser voltage limit disabled output Laser photodiode current limit disabled output Laser photodiode power limit disabled output Laser short circuit disabled output Laser out of tolerance disabled output Laser control error disabled output Power failure Laser mode change disabled output Incorrect configuration for calibration to start Calibration must have the output on to start Po mode selected with PD Response set to zero Calibration cancelled Thermal trip Command not supported Non specific error Cause
6. accuracy from a range of 10 C to 75 C When connecting a thermistor to the LaserPak one side of the thermistor should be connected to the Thermistor input on the analog interface pin 10 while the other side should be connected to the Ground input pin 8 Temperature or resistance measurements can be read over the computer interface using the LASER T or LASER R commands respectively LaserPak User s Manual Page 21 The Steinhart Hart Equation As can be seen from the temperature versus resistance graph above resistance varies inversely with temperature in a non linear fashion This relationship can be accurately modeled by polynomial equations and one such being the Steinhart Hart equation L A B In R C In R The coefficients A B and C can usually be obtained from the thermistor manufacturer The LaserPak defaults to the coefficients for the BetaTHERM 10K3A1 thermistor A 1 12924x10 B 2 34108x10 C 0 87755x10 You can change the coefficients using the LAS CONST command or through the Settings dialog within Arroyo Control Using the Analog Interface The Analog Interface is a feature not found on our bench top laser drivers as it is designed to be used in applications where a user interface or even a PC is not available The Analog Interface has two sections the logic level control status pins and the analog control monitor pins plus an auxiliary power supply The 3 3V auxiliary supply is p
7. contacting the distributor from where you purchased the instrument or directly from Arroyo Instruments A complete list of distributors is available on the Arroyo Instruments web site You can contact Arroyo Instruments through one of these methods By mail Arroyo Instruments 624 Clarion Court San Luis Obispo CA 93401 USA By phone 1 805 543 1302 By fax 1 805 543 1303 By email support arroyoinstruments com On the web http www arroyoinstruments com In all cases Arroyo Instruments requires a return materials authorization RMA number You must contact Arroyo Instruments and obtain an RMA number prior to returning your instrument or the shipment may be rejected and sent back to you LaserPak User s Manual Page 35 European Community Declaration of Conformity EC Declaration of Conformity 5 CE Arroyo Instruments of 624 Clarion Court San Luis Obispo CA 93401 USA declare that 485 Series LaserPak Laser Diode Driver In accordance with the following directives EMC Directive 89 336 EEC Low Voltage Directive 73 23 EEC RoHS Directive 2002 95 EC89 336 EEC has been designed and manufactured to the following specifications EMC Directive Test Standards EN 61326 Electrical Equipment for Measurement Control and Laboratory Use EMC Requirements This encompasses 10 individual Tests Low Voltage Directive Test Standards EN 61010 Electrical Equipment for Measurement Control and Laboratory Use
8. monitor photodiode control mode is used to control the laser diode using the monitor diode feedback You select the target monitor diode current and the LaserPak will drive exactly enough forward current through the laser diode to generate the selected monitor diode current Only low frequency modulation 10Hz or less is possible in Im mode due to the feedback latencies of the photodiode itself Po mode also referred to as APC or automatic power control mode is simply Im mode with a mathematical constant applied to the set point providing a convenient way of operating in milliwatts Using the PD Resp factor in uA mW a Po set point is internally converted to an equivalent Im set point by the driver which is then used to control the photodiode feedback For example if the PD Resp factor was 10 then a set point of 1mW would be the same as a set point of 10pA Vf mode also referred to as AVC or automatic voltage control mode is used to control the voltage driven through the device Unlike ACC mode AVC mode allows the current to drive to whatever current is necessary to achieve the voltage set point so long as it does not exceed the current limit As with Im mode only low frequency modulation 10Hz or less is possible in Vf mode Modulation The instrument supports external analog modulation using the modulation pins on the analog interface connector Modulation rates vary by model so see your model s specification for the max
9. on or off Next connect the cable between your LaserMount or other fixture and the Output connector of the LaserPak We recommend using our cables as they have been designed to work well with the LaserPak If using your own cables ensure they have been properly wired according to the pin out of the LaserPak and your fixture Pl a F0y0 INSTrUMENTS Page 8 LaserPak User s Manual Prior to turning the output on click the Settings button and adjust the current and voltage limits as appropriate for your device You will typically want the limits to be 10 or more above the operation limits of your device When setting the voltage limit take into account the voltage loss in the cable which can amount to several tenths of a volt at higher currents When first turning on the system start with a set point of OMA and turn the output on Initially increase in small steps a few milliamps to ensure the wiring is correct Once the system appears to be running correctly you can adjust the set point to the desired operating value It s that simple For more detailed operating and installation instructions read on Installation Installation of the LaserPak is very straightforward as the quick start section above illustrated This section will provide additional details and considerations for installing your LaserPak After unpacking the unit make sure all packing materials have been removed and nothing obscures the ventilation port
10. output will also be changed to reflect the new state For example if the logic input goes from false to true turn the output on then the output will be turned on Later if a LAS OUT OFF is received from the computer turn the output off then the output will be turned off even though the logic input is still high Likewise if the computer sends a LAS OUT ON the output will be turned on regardless of the logic input s state Later if the logic input goes from true to false then the output will be turned off In this way on off operation can be supported simultaneously through the analog interface and the PC interface without conflict On Off Status Output This logic level output reflects the present output state of the instrument When it is on this output will be high Stable Status Output The output is considered stable when the actual drive value has remained within the tolerance band around the set point for a specific amount of time as defined by the tolerance settings Once the output is considered stable then this logic level output will be set to high If the set point is changed or a disturbance causes the actual output to fall outside the tolerance setting then this logic level output will be set to false and the process starts over The output will also be false whenever the output is off In addition there are several analog signals Analog Modulation Input The analog modulation input allows the user to c
11. s Manual General Warnings Potentially lethal voltages exist within this instrument This instrument is intended for use by qualified personnel who understand the shock and laser hazards and are familiar with safety procedures required to avoid injury Read this manual completely before attempting to use this product To avoid electrical shock ensure a 3 prong power cord is used and is plugged into a earth grounded receptacle Failure to do so can result in severe injury or death There are no user serviceable parts inside All service and repair work shall be done by Arroyo Instruments or personnel authorized by Arroyo Instruments Modifications done by non authorized personnel will void the warranty Please see the Service section later in this manual for instructions on how to obtain service for this instrument LaserPak User s Manual Page 7 The latest generation of the LaserPak requires the requires proper AC voltage selection before plugging into the AC mains After unpacking the unit ensure that the voltage selection is set to the correct voltage This is critical as incorrect voltages can damage the unit The LaserPak is factory configured to the destination county s AC line voltage prior to shipment and should not need to be changed See Verifying the Voltage Selection in the Installation section below on how to identify the voltage settings of the instrument Once the voltage selection has been completed pl
12. the USB Drivers Using the LaserPak via USB is just as simple as using the serial port In fact once you have installed the USB drivers the instrument will appear as a virtual serial port that you can use just like a normal serial port To install the drivers simply plug in the instrument to your computer When the Add New Hardware wizard appears insert the CD you received with the LaserPak and follow the on screen instructions Once the drivers are installed the LaserPak will be available as a standard COM serial port In the event you have multiple Arroyo Instruments products plugged in simultaneously you will need to experiment to see which instrument was assigned to which port For example you could send a IDN query and see which instrument goes into remote mode Interface Connectors In addition to the input power connector described above there are four connectors on the LaserPak the output connector the analog interface connector the USB connector and RS232 connector LaserPak Rear Panel LaserPak Front Panel LaserPak User s Manual Page 17 Laser Output Connector The Output connector is a female DB 9 and has the following pin out DB 9 Pin Description 1 Interlock 2 Interlock 3 Earth Ground 4 amp 5 Laser Cathode 6 Photodiode PD Cathode 7 Photodiode PD Anode 8 amp 9 Laser Anode Shell Earth Ground Output Connector DB 9 Female Arroyo Instruments has followed industry conventio
13. to the Analog Interface is very straightforward Because the inputs and outputs are buffered you do not need any external filters or buffers unless your application requires it The logic level interfaces are all high impedance as is the modulation input The analog current and photodiode current monitors output are driven through a 4990 resistor to protect against output shorting Pr at r0y0 INStruUMeNIS Page 24 LaserPak User s Manual Do not connect the analog interface ground pin to either the laser anode or laser cathode connections as it may damage your laser or the instrument A typical application might look like this LaserPak Analog Interface Modulation Ground On Off Control CPU or On Off Status I O Board Stable Status lo Monitor Grounding Considerations The LaserPak employs a different isolation strategy than the LaserSource instruments which use optical isolation The LaserPak instead uses high impedance differential measurements with an earth ground bypass capacitor to minimize ground loop potentials However improperly wired setups can still cause ground loops so care should still be employed and any ground loops identified and broken From any point in the system make sure that there is only a single path to earth ground Photodiode Input Considerations Great care was taken in the design of the photodiode input stage to support all wiring configurations of the l
14. 5 Ground 1 4 6 Commoned together 7 8 Commoned together 9 No connection Shell Earth ground RS232 Connector DB 9 Male For more information on using the RS232 interface see the Computer Interfacing Manual which is included on the CD that accompanied this product LaserPak User s Manual Page 19 Connecting to the LaserPak A laser diode is very sensitive to electro static discharge ESD over voltage and over current conditions When connecting a laser to the LaserPak make sure proper ESD procedures are taken In addition it is critical that the proper current limit and voltage limit be set for the laser diode Exceeding the laser diode s rated current or voltage can damage or destroy the laser diode and the LaserPak s hardware protection features can only protect the laser diode if these limits are properly set While connecting to only one of the DB 9 s cathode pins 4 and 5 and anode pins 8 and 9 connections is required you should connect cathode to both pins 4 and 5 and anode to both pins 8 and 9 to provide the best connection through the DB 9 connector The interlock connections must be kept isolated from all other connections and from earth ground Failure to do so may damage the instrument The Laser anode and cathode outputs are electrically isolated from earth ground as are the photodiode inputs However the ground of the analog interface cannot be connected to either the laser anode or cathode When
15. Manual Page 27 Description CW Mode Specifications SETPOINT LASER CURRENT Range mA Resolution mA Accuracy set mA Stability ppm time Temperature Coeff ppm C Noise Ripple uA rms Transients pA Compliance Voltage V PHOTODIODE CURRENT Range yA Resolution pA Accuracy set pA Stability ppm time Temperature Coeff ppm C PD Bias V LASER VOLTAGE Range V Resolution V Accuracy set V Stability ppm time Temperature Coeff ppm C EXTERNAL MODULATION Input Range Modulation Bandwidth MEASUREMENT LASER CURRENT Resolution mA Accuracy reading mA LASER VOLTAGE Resolution V Accuracy reading V PHOTODIODE CURRENT Resolution pA Accuracy reading pA LIMITS LASER CURRENT Resolution mA Accuracy reading mA LASER VOLTAGE Resolution V Accuracy FS GENERAL Laser Connector Photodiode Interlock Connector Computer Interface Power Size H x W x D inches mm Operating Temperature Storage Temperature Specifications 485 02 15 485 04 08 485 08 05 0 2000 0 4000 0 8000 0 1 0 1 0 5 0 05 0 4 0 05 0 8 0 05 1 6 lt 10 1 hour 50 lt 60 lt 100 lt 200 lt 300 lt 400 lt 600 15 8 5 5 10 000 1 0 05 1 lt 200 24 hours lt 200 Jumper selectable No bias 3V default 5V 0 15 0 8
16. Safety Requirements This Certificate is the Manufacturer s Declaration which states that the 485 Series LaserPak Laser Diode Driver is Compliant to the above noted EU Directives and are therefore eligible to bear the CE MARK This equipment as of the listed Date of Manufacture is technically exempted from the RoHS Directive Requirements not being classified as consumer electronics equipment hereby declare that the equipment named above has been designed to comply with the relevant sections of the above referenced specifications The unit complies with all essential requirements of the Directives aa Paul Corr eae NAME OF AUTHORIZED PERSON SIGNATURE OF AUTHORIZED PERSON President 1 February 2010 TITLE OF AUTHORIZED PERSON DATE OF ISSUE Pr at r0y0 INSTrUMENTS Pl arroyo INSTrUMENTS 624 Clarion Court San Luis Obispo CA 93401 Tel 805 543 1302 Fax 805 543 1303 sales arroyoinstruments com www arroyoinstruments com Copyright 2011 Arroyo Instruments All Rights Reserved P N 530 1022E
17. age 33 Remove the existing AC selector harness from the PCB and install the new one The two available harnesses are shown below This unit set for 230 V 115V Slide the top cover back onto the bottom ensuring that the fan wire in not being pinched Install the six black Phillips flat head screws Install the two jack screws into the OUTPUT connector Tighten only lightly or you risk the change of snapping off the head of the jack screw Finally to avoid confusion remove the external sticker indicating the old AC voltage You can still verify the AC voltage as the AC selection harness is clearly visible through the vent holes Avoid confusion Remove this label v Y b o Fa c e VU Pl 31r 0y0 INSTrUMENTS Page 34 LaserPak User s Manual Maintenance and Service Maintenance The LaserPak requires no regular maintenance other than product calibration To clean the instrument use cotton cloth that is only damp not wet with a light solution of soap and water Fuses Under normal operation you should never need to replace a fuse However if either fuse does blow use only T 250V IEC 60127 2 5x20mm metric fuses with a current rating as specified on the unit as replacements If after replacing the fuse it continues to blow immediately discontinue use of the instrument and contact service for support Service Service and repair for the LaserPak can be obtained by
18. aser and photodiode common anode common cathode etc without requiring the laser diode to be wired differently depending on the laser photodiode wiring scheme LaserPak User s Manual Page 25 The LaserPak comes configured for 3V photodiode bias which is typically sufficient for any application although no bias and 5V bias are also available The 5V bias cannot be used if either side of the laser is connected to the photodiode cathode The no bias setting is not typically used as the current of the photodiode will slightly forward bias the photodiode which is more than offset by 3V or 5V bias and is the primary reason for the reverse bias To change the bias setting the cover must be removed and a jumper changed on the circuit board Make sure the power cord is unplugged from the unit and also remove the output cable if it is connected Both jack screws on the output connector need to be removed as do all 6 black flat head screws on either side of the enclosure Slide the top off the OUTPUT connector and rotate up The fan is mounted to the portion of the enclosure you are lifting off so take care that the power connector to the fan is not stressed To change the bias setting locate J11 on the circuit board It is on the fan end of the board right next to the large white power connector On the board you will see three settings NO 3V and 5V Move the jumper to the setting you desire When replacin
19. connecting multiple LaserPaks using a common anode or cathode connection such as a multi stage laser typically only one point of connection can be made between LaserPaks Please contact the factory to verify your wiring plan Connections to the LaserPak and the laser diode fixture must be secure Tighten any screws on the DB 9 connectors and make sure all connections are in good condition Poor or intermittent connections can damage or destroy the laser diode See the manual for your laser and fixture for additional safety and operational information Pr af r0y0 INSTrUMENTS Page 20 LaserPak User s Manual Working With Thermistors The LaserPak is designed to work with 10kQ negative temperature coefficient NTC thermistors such as the BetaTHERM 10K3A1 thermistor used in the LaserMounts A thermistor works by translating temperature into resistance with resistance decreasing as temperature increases hence the negative coefficient Here is a typical response curve of a thermistor 50000 40000 30000 20000 Resistance Q 10000 0 10 00 10 00 30 00 50 00 70 00 90 00 110 00 Temperature C Typical Resistance vs Temperature Graph The LaserPak uses a ratio metric measurement with a well known 10kQ fixed resistor and a precision voltage reference to determine the thermistor resistor Because of this the circuit is most sensitive and accurate at 20 C but is usable with reasonable
20. ered to the laser diode This limit is implemented in hardware for immediate response For more information about limits see see Hardware and Software Limits below LaserPak User s Manual Page 13 Description Factory Computer Default Command Cable R PD Resp Tol Time Tol lo On Delay The cable resistance in ohms This 0 0000 Q LAS CABLER setting can be used to compensate for voltage losses in the cable due to cable and connector resistances Cable R is ignored in Vf AVC Mode For more information about this feature see Using the Cable R Setting below This factor is used by the unit to 0 00uA mW LAS CALPD convert from monitor photodiode current into optical power The value is in terms of microamps per milliwatt uA mW such that power photodiode current divided by the factor Tolerance time is the amount of 5 seconds LAS TOL time in seconds that the measured value current voltage etc must be within the set point the tolerance for the unit to be considered in tolerance In lo modes the tolerance is defined by Tol lo For Im Po modes the tolerance is fixed at 50uA For Vf mode the tolerance is fixed at 50mvV Tolerance current is a band in mA 10 0mA LAS TOL around the set point When the actual current is within this band for longer than the Tol Time setting then the unit is considered to be in tolerance The delay from the time the output 3000ms ONDELAY is tur
21. g the cover if the fan was unplugged make sure to plug it back in the fan connector is J3 also marked FAN on the circuit board Take care not to pinch the fan wires as the top is put back into place Screw the six flat head screws back in and gently screw in the jack screws do NOT over tighten the jack screws or you run the risk of snapping them off in the connector The LaserPak provides several limit features for protection of the laser diode These include current voltage photodiode current and photodiode power limits Both the current and voltage limits are implemented in hardware providing for fast response to changes in laser diode operation When a voltage limit is detected the output is immediately shutdown Because of the sensitivity of the voltage limit operating near the limit within one to two hundred millivolts is not recommended In general you should set the voltage limit to 0 1V to 0 2V higher than any anticipated operating point The voltage limit is tested against the voltage at the connector Any Cable R value is ignored as Cable R is a software only calculation and the voltage limit is implemented in hardware See Using the Cable R Setting above for more information on the Cable R setting Pr at r0y0 INStruUMeNIS Page 26 LaserPak User s Manual Unlike the voltage limit the current limit simply prevents the LaserPak from delivering more current than the limit is set to When the current limit enga
22. ges the output will remain on The photodiode current and photodiode power limits are implemented in software and may take up to one second to trigger when these conditions occur and therefore should not be relied on to provide fast protection of the laser diode Thermal Considerations The LaserPak is designed to provide high power in a small enclosure A key component is an adjustable power supply that is dynamically tuned to meet the needs of your load However when operating at high currents and very low voltages it is possible that more heat than the LaserPak can manage will be generated inside the instrument In that condition the instrument will automatically shut itself off and generate an E 537 error message A possible fix to this condition is lowering the Vf Limit to just above the highest voltage needed for the maximum set point you will be using This gives the unit a hint as to the required voltage and may be enough to eliminate the thermal trip error If your instrument still continues to thermally trip you will need to add series resistance with the laser to remove some of the power from inside the unit Typically a 20W 1Q load resistor in series with the laser is sufficient but higher resistances and or power handling may be needed depending on the voltage and current configuration of your LaserPak Please feel free to consult the factory for more information and support Specifications LaserPak User s
23. hange the set point using a voltage signal The voltage input range is from OV to 10V where LaserPak User s Manual Page 23 OV equals a set point of zero and 10V equals a set point of the full scale range For example on a 5A driver 10V input would attempt to drive 5A which is the full scale of the instrument In this case the transfer function would be 500mA V The modulation input is added to the set point of the instrument For example if you were operating in lo Mode and the set point was 500mA on a 5A driver and you applied a voltage of 4V which is equal to 2A then the output drive current would be 2 5A The allowable voltage input range on the analog input is 0 to 10V Be sure not to exceed 10V on the input or damage to the instrument may occur Analog Current Monitor Output The actual current being driven by the instrument is provided as an output voltage where 2 5V equals full scale of the output Analog Photodiode Current Monitor Output The actual photodiode current measured by the instrument is provided as an output voltage where 2 5V equals FS of the output Thermistor Input Thermistor operation is described in the Working With Thermistors section above The thermistor should be connected to the Thermistor and Ground pins Auxiliary Analog Input This input accepts from OV to 2 5V input and it s measurement can be read using the LAS AUX query Connecting to the Analog Interface Connecting
24. hich forced a shutdown of the laser output A power failure was detected A change in the operating mode of the LaserPak while the output was on shutdown the output The LaserPak was not configured properly including the mode and output on state to be able to start the desired calibration process The laser output must be on for the calibration process to start Attempted to select Po mode and PD Response was zero or LaserPak was in Po mode and PD Response was set to zero The active calibration process was cancelled Excessive power dissipated inside unit Lower voltage limit or add series resistance See Thermal Considerations for more details A command was recognized but not supported by the LaserPak A non specific error was encountered LaserPak User s Manual Page 29 Mechanical Drawings 1 47 37 3 n 1 62 41 L 4 50 114 3 0000000000 0000000000 000 0000000000 3 00 76 2 59 15 62 15 8 1 06 27 aay 98 25 Wee es Si Y CE lt 7 q 62 15 8 oes Ge 1 07 27 1 _ 1 99 50 4 Rear View Pl af r0y0 INS TUMENTS Page 30 LaserPak User s Manual 19 4 8 8 50 215 9 a L 19 43 Top View 50 12 7 75 19 1 3 00 76 2 4X 6 32 UNC 6 00 152 4 6 00 152 4 1 25 1 25 Left Side View Bottom View LaserPak User s Manual Page 31 Changing the AC Line Voltage Setting Th
25. hipped If you unit is not a universal input or the AC mains are not correct for your application please see the section entitled Changing the AC Line Voltage Setting towards the end of this manual for information on how to verify or change the AC line voltage Do not exceed 250VAC on the line input It is critical to select the proper voltage selection prior to applying power to the unit If the actual voltage exceeds the voltage selection by 10 damage to the unit may occur Powering Up the Unit Connect the AC power cord to the unit Turn the power switch located on the AC power input power connector into the on position The unit will go through a quick power up self test and return to the last known operating state Pr af r0y0 INSTrUMENTS Page 10 LaserPak User s Manual The AC Power LED will light up and the On Error LED should remain dark until the output is turned on if Automatic Output On has been enabled in Arroyo User Limits the On LED may light without user intervention Ventilation The LaserPak has vent holes on the front and rear of the unit You must not block these vent holes or overheating may occur causing damage to the unit Do not operate the unit above 40 C ambient and ensure the instrument is properly ventilated or the unit may overheat and possible damage to the instrument may occur Rack Mounting A rack mount kit p n 1402 RM for standard 19 racks is available for the
26. imum modulation rates Only lo HiBW mode supports high speed modulation All other modes of operation have a modulation bandwidth of 10Hz or less Pr at r0y0 INStruUMeNIS Page 12 LaserPak User s Manual All parameters of the LaserPak can be viewed and changed using ArroyoControl or via the appropriate computer command Description Factory Computer Default Command Basic Settings Mode As described in the Control Modes lo ACC LAS MODE section above the unit offers five control modes lo ACC lo HiBW ACC Im AMC Po APC and Vf AVC Change this setting to select anew mode lo limit This setting controls the maximum Maximum LAS LIM LDI amount of forward current that can be delivered to the laser diode This limit is implemented in hardware for immediate response For more information about limits see Hardware and Software Limits below Im limit This setting controls the maximum Maximum LAS LIM MDI amount of monitor photodiode current the unit will allow This limit is implemented in software For more information about limits see Hardware and Software Limits below Po limit This setting controls the maximum Maximum LAS LIM MDP amount of monitor photodiode power the unit will allow This limit is implemented in software For more information about limits see Hardware and Software Limits below Vf limit This setting controls the maximum Maximum LAS LIM LDV amount of forward voltage that can be deliv
27. is section only applies to 2 generation LaserPaks which must be configured to match the AC mains voltage to which they will be connected On these LaserPaks the label will indicate Internally Selectable 115 or 230 VAC as shown in the illustration below Portion of label showing input voltage range for selectable 115VAC or 230VAC input LaserPaks To change the voltage selection you will need the appropriate AC jumper harness as pictured below The harness is not normally supplied with the unit and must be requested from Arroyo Instruments Once you have the required AC jumper remove the power cord from the unit Using a 5 16 hex driver or wrench remove the two jack screws from the DB 15F OUTPUT connector as shown with the two red arrows below Pr at r0y0 INSTrUMENTS Page 32 LaserPak User s Manual Next using a 1 Philips screwdriver remove the three black screws from each side of the instrument six total as shown below Sa E m MANA e ye AWN pi r ma he N Ee SSS Gently slide the cover forward over the OUTPUT connector until the top is clear of the bottom far enough that the AC selector harness is visible as shown below If the top is fan is removed too far the fan may become unplugged If this happens simply reconnect it to the J2 connector on the PCB and take care that the fan wires are not pinched when sliding the cover back on LaserPak User s Manual P
28. liamps The easiest way is to drive 1A of current When lamps equals 1A 1000mA the measured voltage is also the resistance of the cable To short the cable disconnect the laser and short the anode and cathode together as close to the end of the cable as possible Ideally the short should be done by soldering the anode and cathode wires together to minimize the resistance in the short itself How the Calculation Is Used The LaserPak continuously takes the measured current multiplies it by the resistance Cable R subtracts the result from the actual voltage at the output connector and displays this value on screen as Vf However there are some limitations to how the cable loss calculation is used 1 The value for Vf Limit is always the voltage at the connector This means that the Vf Limit must take into account all the voltage required including the cable loss i e the voltage displayed if the Cable R value were zero 2 Cable R is ignored in Vf mode This means that the set point and measured voltage are always the voltages at the connector and Cable R is not used Pr at r0y0 INStruUMeNIS Page 16 LaserPak User s Manual Remote Mode Operation Remote mode operation is when the LaserPak is being controlled by a computer over the USB or RS232 interfaces Details on how to communicate with the LaserPak can be found in the Computer Interfacing Manual which is included on the CD that accompanied this product Installing
29. n to constant current and constant photodiode current modes the LaserPak also operates in constant voltage control mode allowing you to use it in precision voltage applications such as EML devices or for doing V I measurement graphs The LaserPak offers all the features you would expect from a modern precision laser diode driver including e 10ppm current stability over one hour e Broad range of currents e Comprehensive laser protection circuitry including hardware voltage and current limits e External analog modulation e Power control mode both in photodiode current AMC or computed photodiode power APC modes e Voltage control mode What s in the Box Along with the LaserPak itself a CD with electronic copies of this manual the Computer Interfacing Manual and USB drivers are included For USA customers a power cord is included For non USA customers an IEC 60320 C13 rated AC power cord must be provided Pr at r0y0 INSTrUMENTS Page 4 LaserPak User s Manual Accessories Arroyo Instruments also sells several accessories designed to work with the LaserPak These include e LaserSource Cable 2m p n 1220B This cable has DB 9 male female connectors for interfacing to the LaserMount or other connectorized fixtures e LaserSource Cable 2m Pigtailed p n 1221B This cable has a female DB 9 connector for plugging into the LaserSource and tinned leads for wiring into custom solutions e Pak Series Rack Mount Ki
30. ned on with the LAS OUTPUT command or the analog interface to when the output is actually energized Pr at r0y0 INSTrUMENTS Page 14 LaserPak User s Manual Cable Wiring for Modulation When modulating at higher frequencies gt 1 kHz it is critical that high quality shielded twisted pair cabling be used and wire size suitable for the applied current or the equivalent if using a multi conductor cable See the chart below for suggested sizes Failure to do so may result in current oscillations that may damage your laser When operating in these modes always use shielded cable and never use individual wires to connect the instrument to your laser If in doubt use a current probe attached to an oscilloscope to monitor actual performance Arroyo Instruments offers the 1222 1223 series cables specifically for this application For questions contact the factory or your local representative for additional help Below 1A 22 AWG 1A to 5A 20 AWG 5A or greater 18 AWG Using the Cable R Setting The Cable R setting allows you to calculate the voltage at the laser by subtracting the voltage loss through the cable and connectors This is done by measuring or calculating the cable resistance and entering the value in ohms into the Settings dialog within Arroyo Control The instrument will then use the V R formula to calculate the voltage loss in the cable and subtract that from the actual measured voltage displaying the result a
31. ns for laser DB 9 connections and is compatible with pin outs from other vendors Analog Interface Connector The Analog Interface connection is a male DB 15 and has the following pin out DB 15 Pin Description 1 On Off Control Input 2 On Off Status Output 3 Stable Output 4 Analog Current Monitor 5 Modulation 6 Modulation 7 3 3V Auxiliary Supply 8 Ground 9 Auxiliary Analog Input 10 Thermistor 11 Analog Photodiode Monitor 13 15 No Connection Analog Interface Connector DB 15 Female The 3 3V auxiliary supply is provided for external low power electronics Current draw on this supply should not exceed 100mA The Ground pin provides the ground reference for the logic inputs and analog outputs as well as the auxiliary power supply The modulation input has a separate analog ground reference Modulation which can be common to Ground if your setup requires it The analog interface is described in detail in the Using the Analog Interface section below Pl 31r 0y0 INSTrUMENTS Page 18 LaserPak User s Manual USB Connector The USB connector is a standard Type B female connector and can be plugged into any USB 1 1 or USB 2 0 port For more information on using the USB interface see the Computer Interfacing Manual which is included on the CD that accompanied this product RS232 Connector The RS232 connection is male DB 9 connector wired in a NULL modem configuration Pin Description 2 Receive 3 Transmit
32. rovided for external low power electronics and current draw on this supply should not exceed 100mA The Ground pin provides the ground reference for the logic level inputs and outputs and analog outputs The modulation input has a separate ground Modulation The logic level inputs operate off a low or high voltage input A logic zero below 1V is considered to be off or false while a logic one above 2 5V but do not exceed 5V is considered to be on or true For logic level outputs a false will be OV while a true will be 3 3V Do not exceed 5V DC on any logic input pin or 3V DC on any analog input pin or damage to the instrument may occur Pr at r0y0 INSTrUMENTS Page 22 LaserPak User s Manual There are three logic level pins On Off Control Input This input controls the on off state of the instrument When this input transitions from off to on the output is turned on and begins controlling to the set point Similarly when it transitions from on to off the output is turned off It is possible to use the analog interface with the computer interface as the LaserPak is looking for a change in the logic input to turn the output on or off as appropriate considered an edge triggered input rather than a evel triggered input It is possible for the computer interface to turn the output on or off as well ignoring the steady state of the logic input However as soon as the logic input changes state then the LaserPak s
33. s Vf on the display Common values for Cable R range from 0 0300 to 0 0900 Q but can be significantly higher if you have long runs many connector interfaces or small gauge wire While it is possible to use a DMM to measure the resistance of the cable because resistance is so small you will not typically get proper readings A better approach is to use the instrument to drive current through the system and then measure the voltage loss to determine resistance There are two ways to best calculate the voltage loss Measure the Voltage at the Laser If you have an accurate DMM and can measure the voltage across the laser or accurately know the voltage of the laser at a specific current and voltage across the pins at the Output connector then the difference between the measured voltages is the voltage loss in the cable Use this formula to calculate resistance LaserPak User s Manual Page 15 Ca b le R V eae a V aser AMPS Note that the current is expressed in amps not milliamps so divide the set point by 1000 before using it in this equation Short the Connection at the End of the Cable A second method which can be done with just the LaserPak is to short the cable at the end of the cable nearest the laser diode drive current through the cable and measure the voltage The resistance is found using an simpler version of the formula above y Cable R 2 AMPS Note that the current is expressed in amps not mil
34. s on the front and back of the unit Verifying the Voltage Selection Before powering on the unit ensure that the voltage selection is set correctly Improper voltage selection can easily damage the unit On first generation LaserPaks the AC input was a universal 90 240VAC and no voltage selection is required for these units To determine if your LaserPak is of the universal AC input type review the label on the top of the unit If it indicates Input 90 240VAC as shown in the illustration below then your unit is universal input and you may skip this section and move on to Powering Up the Unit Input 90 240VAC o fellm Portion of label showing input voltage range for universal AC input LaserPaks For second generation LaserPaks as part of a design upgrade to improve noise performance the unit must be configured for the proper line voltage On these LaserPaks the label will indicate Internally Selectable 115 or 230 VAC as shown in the illustration below LaserPak User s Manual Page 9 Portion of label showing input voltage range for selectable 115VAC or 230VAC input LaserPaks There will also be a white sticker next to the IPC indicating the factory configured voltage range or look into the vent holes to see the rating marked on the jumper inside the unit Voltage selection is done at the factory to match the AC mains standard for the country to which the product is being s
35. t 3 or 5 units p n 1402 RM For installing your TECPak or LaserPak into a standard 19 rack The kit accepts either 3 units for a 2U installation or 5 units for a 3U installation e RS 232 NULL Cable 3m p n 1200 NULL e USB Cable 3m p n 1201 LaserPak User s Manual Page 5 Safety Terms and Symbols The following safety related terms are used in this manual e Warnings noted by the WARNING heading explain dangers that could result in physical injury or death e Cautions noted by the CAUTION heading explain conditions that could result in damage to the instrument other equipment or your device e Notes noted by the NOTES heading are not safety related and are intended simply to point out important information If at any time any of the following conditions exist or are suspected of existing discontinue use of the unit until it can be inspected by qualified service personnel e Visible damage to the unit including damage or stress caused during product shipment e Storage of the unit outside the standard storage temperature or humidity rating or prolonged storage under harsh conditions e Failure to operate properly If needed contact your distributor or Arroyo Instruments for service or repair to ensure the safety of the product is maintained Symbols O Power Off Power On VAN Caution refer to manual Earth ground A N Caution risk of electric shock Pr at r0y0 INSTrUMENTS Page 6 LaserPak User
36. ug the AC cord into the unit and into the wall outlet Turn on the power switch located on the IPC and the unit will power up The AC Power LED should light and the On Error LED should remain dark Control of the LaserPak can be done two ways use the RS232 or USB computer interfaces and control the instrument from the PC or use the analog interface This quick start guide uses the computer interface More information on the analog interface can be found later in the manual To control the LaserPak from the PC use the Arroyo Control software located on the CD that came with the instrument it can also be downloaded from our web site The software is located in the Software folder on the CD Simply launch the installer and follow the on screen prompts Once the software is installed plug the instrument into your RS 232 or USB interface For USB users the instrument may also ask for drivers which can either be automatically downloaded from the Windows Update site or manually installed from the CD Launch Arroyo Conirol and in the LaserSource panel if one is not visible click Add Panel in the lower right of the window and click Add a Laser Panel select the communications port to which your LaserPak is connected For USB users this will usually be the highest numbered port in the list Click Connect and Arroyo Control will begin controlling the LaserPak Once connected you will be able to adjust settings limits and turn the output
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