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I N S T A L L A T I O N   A N D   O P E R A T I O N

Introduction to the LDX-3500 Series Front Panel

18 

LDX-3500 Series

C H A P T E R  

2

 

Laser Diode Connections and Shielding

Before connecting the laser diode to the LDX-3500 Series Precision Current Source, be
sure that the front panel (OUTPUT) ON switch is in the OFF position (ON LED unlit).
Before turning on the LASER output, be sure that the current limit has been correctly set.

The interlock pins (1 and 2) on the LASER connector must be shorted in order to turn on
the LASER output current.

Figures 2.4 - 2.7 show the possible configuration of connecting laser diodes and
photodiodes with the LDX-3500 Series Precision Current Sources.

Figure 2.4

Common Laser Cathode - Photodiode Cathode

Figure 2.5

Common Laser Cathode - Photodiode Anode

+

-

+

Bias

3500 Series Precision Current Source

OUTPUT

7

6

8, 9

4, 5

3

P. D.

L. D.

Earth Ground

+

-

+

Bias

OUTPUT

7

6

8, 9

4, 5

3

P. D.

L. D.

Earth Ground

3500 Series Precision Current Source

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Summary of Contents for LDX-3500 Series

Page 1: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

Page 2: ...n P O Box 6310 Bozeman MT U S A 59771 1 800 459 9459 www ilxlightwave com U S Canada International Inquiries 406 586 1244 Fax 406 586 9405 E mail support ilxlightwave com 70016907_R00_03 03 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 4: ...ns and Accessories 1 Specifications LDX 3525 2 Specifications LDX 3545 5 Specifications LDX 3565 8 Chapter 2 Installation and Operation Installation 11 AC Power Considerations 11 Rack Mounting 12 Power Up Sequence 12 Introduction to the LDX 3500 Series Front Panel 13 Adjustments 13 Display 13 Parameters 14 Parameter Setup 14 Current Output 14 Control Mode and Current Range 15 Modulation 15 Artisan...

Page 5: ...ations 20 General Operating Procedures 21 Warm Up and Environmental Considerations 21 Current Mode Operation 21 Power Mode Operation 22 Chapter 3 Maintenance Calibration Overview 24 Recommended Equipment 24 Environmental Conditions 24 Warm Up 25 Calibration Adjustments 25 Current Source Calibration 25 Monitor Current Power Mode Calibration 27 Appendix A Troubleshooting Artisan Technology Group Qua...

Page 6: ...anel LD Controller 17 Figure 2 4 Common Laser Cathode Photodiode Cathode 18 Figure 2 5 Common Laser Cathode Photodiode Anode 18 Figure 2 6 Common Laser Anode Photodiode Cathode 19 Figure 2 7 Common Laser Anode Photodiode Anode 19 Figure 3 1 IPD Calibration Circuit 27 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 7: ...L I S T O F FI G U R E S iv LDX 3500 Series Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 8: ...L E S 3_03 LDX 3500 Series v LIST OF TABLES Table 2 1 Modulation Transfer Functions 15 Table 3 1 Recommended Test Equipment 24 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 9: ...L I S T O F TA B L E S vi LDX 3500 Series Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 10: ...n serious injury or death WARNING 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 inten...

Page 11: ...ating temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation 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 inju...

Page 12: ... Service 2 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 of the instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing container with at least 3 inches...

Page 13: ...roduct we ask that you direct any product operation or service related questions or comments to ILX Lightwave Customer Support 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 f...

Page 14: ...ce are 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 Artisan Technology Group Quality Instrumentatio...

Page 15: ...WA R R A N T Y xii LDX 3500 Series Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 16: ...ions and accessories available for the LDX 3500 Series Precision Current Sources include the following Other Laser Diode Mounts are available Please contact ILX Lightwave for information on additional options for your applications Description Model Number Single rack mount flange kit 134 Dual rack mount flange kit enables installation into a standard 19 inch wide rack 135 Temperature Controlled La...

Page 17: ...ansients resulting from a 200 V power line spike 6 Specified values are a percent of nominal Constant power mode stability specification assumes zero drift in detector responsivity Current Source 200 mA Range 500 mA Range Set Point Accuracy 0 2 mA 0 5 mA Set Point Resolution 50 µA 125 µA Compliance Voltage fixed 7 V maximum 7 V maximum Temperature Coefficient 50 ppm oC 50 ppm oC Stability1 for 1 h...

Page 18: ... mW Responsivity Resolution 0 001 mA mW 0 001 mA mW Optical Power Range 0 000 mW 500 0 mW 0 000 mW 500 0 mW Output Power Resolution 1 µW 10 µW or 100 µW 1 µW 10 µW or 100 µW Current Limit Setting 200 mA Range 500 mA Range Range 0 202 mA 0 505 mA Resolution 1 mA 2 mA Accuracy 2 mA 5 mA Analog Modulation Voltage Control Input 0 10 V 10 KX 0 10 V 10 KX Transfer Function 20 mA V 50 mA V Transfer Funct...

Page 19: ...odulation Connector BNC instrumentation amplifier input Analog Output BNC General Size 3 5 x 7 3 x 12 Weight 6 0 lbs Power Requirements 100 120 220 240 VAC 10 50 60 Hz Temperature 0 to 40 oC operating 40 to 70 oC storage Humidity 85 relative humidity non condensing Laser Safety Feature Key switch interlock and output delay meets CDRH US21 CFR 1040 10 Display type 4 digit green LED Artisan Technolo...

Page 20: ...a 200 V power line spike 6 Specified values are a percent of nominal Constant power mode stability specification assumes zero drift in detector responsivity Current Source 1000 mA Range 3000 mA Range Set Point Accuracy 1 mA 3 mA Set Point Resolution 250 µA 750 µA Compliance Voltage fixed 6 5 V maximum 6 5 V maximum Temperature Coefficient 50 ppm o C 50 ppm o C Stability1 for 1 hour 20 ppm 20 ppm S...

Page 21: ...ity Resolution 0 001 mA mW 0 001 mA mW Optical Power Range 0 000 mW 3000 0 mW 0 000 mW 3000 0 mW Output Power Resolution 1 µW 10 µW 100 µW or 1 mW 1 µW 10 µW 100 µW or 1 mW Current Limit Setting 1000 mA Range 3000 mA Range Range 0 1010 mA 0 3030 mA Resolution 4 mA 12 mA Accuracy 10 mA 30 mA Analog Modulation Voltage Control Input 0 10 V 10 KX 0 10 V 10 KX Transfer Function 100 mA V 300 mA V Transf...

Page 22: ...Modulation Connector BNC instrumentation amplifier input Analog Output BNC General Size 3 5 x 7 3 x 12 Weight 8 0 lbs Power Requirements 100 120 220 240 VAC 10 50 60 Hz Temperature 0 to 40 o C operating 40 to 70 o C storage Humidity 85 relative humidity non condensing Laser Safety Feature Key switch interlock and output delay meets CDRH US21 CFR 1040 10 Display type 4 digit green LED Artisan Techn...

Page 23: ...00 V power line spike 6 Specified values are a percent of nominal Constant power mode stability specification assumes zero drift in detector responsivity Current Source 2000 mA Range 6000 mA Range Set Point Accuracy 2 mA 6 mA Set Point Resolution 0 5 mA 1 5 mA Compliance Voltage fixed 5 V maximum 5 V maximum Temperature Coefficient 50 ppm oC 100 ppm oC Stability1 for 1 hour 20 ppm 20 ppm Stability...

Page 24: ...mW Responsivity Resolution 0 001 mA mW 0 001 mA mW Optical Power Range 0 000 mW 6000 0 mW 0 000 mW 6000 0 mW Output Power Resolution 0 01 0 1 or 1 mW 0 01 0 1 or 1 mW Current Limit Setting 2000 mA Range 6000 mA Range Range 0 2020 mA 0 6060 mA Resolution 8 mA 24 mA Accuracy 20 mA 60 mA Analog Modulation Voltage Control Input 0 10 V 10 KX 0 10 V 10 KX Transfer Function 200 mA V 600 mA V Transfer Fun...

Page 25: ... Current Source Connectors 9 pin D sub auxiliary BNC for monitor photodiode output External Modulation Connector BNC instrumentation amplifier input Analog Output BNC General Size 3 5 x 7 3 x 12 Weight 9 5 lbs Power Requirements 100 120 220 240 VAC 10 50 60 Hz Minimum Output Load 1 V at 6A max Temperature 0 to 40 o C operating 40 to 70 o C storage Humidity 85 relative humidity non condensing Laser...

Page 26: ...s The LDX 3500 Series Controllers can be configured to operate at nominal line voltages 100 120 220 240 VAC Normally this is done at the factory and need not be changed before operating the instrument However check to be sure that the voltage marked on the back panel of the instrument matches the power line voltage in your area Refer to Chapter 3 Maintenance if it is necessary to reconfigure the i...

Page 27: ...LDX 3500 Series Precision Current Source connected to an AC power source pressing the POWER switch will supply power to the instrument and start the power up sequence During the power up sequence the following takes place For about two seconds all indicators light up and all of the 7 segment displays indicate 8 Then all lamps are turned off for two seconds After this the firmware version number is...

Page 28: ... contains the ENBL adjust enable switch and indicator In order to make any set point or parameter adjustment the ENBL indicator must be lit Pressing the ENBL switch toggles the ENBL indicator on or off Display The display is used to show measurements output set point and parameter set points Whenever a set point is being displayed the VIEW SET indicator will be lit The DISPLAY switch is used to se...

Page 29: ...is set the hardware will limit the output current to the I LIMIT value regardless of the set point or control mode When the P LIMIT is set and the user is in POWER mode the P LIMIT will NOT limit the output current If the power limit is reached in power mode the P LIMIT indicator will blink as a warning The CAL PD parameter is used to convert monitor diode back facet current measurements to light ...

Page 30: ...ge and bandwidth mode see specifications Chapter 1 Bandwidth specifications are measured across a 1 Ω load The modulation port input impedance is 10 kΩ The transfer function mA V in Figure 2 1 is shown for the LDX 3525 This transfer function varies by model and laser drive current output range as shown in Table 2 1 Table 2 1 Modulation Transfer Functions The error indicators become lit when the co...

Page 31: ...dicator blinks at 1 Hz whenever the output laser power exceeds the P LIMIT value while in the constant P mode This indicator is just a warning device There is no actual hardware limiting to a P LIMIT value Therefore the user should set I LIMIT appropriately to protect the laser Back Panel Controls and Connections Refer to Figure 2 2 for the following discussions of back panel controls and connecto...

Page 32: ...voltage between 0 10 volts which is proportional to the output current For example an analog output signal of 5 volts would represent an output current of about 50 of full scale Connecting to Your Laser When connecting laser diodes and other sensitive devices to the LDX 3500 Series Precision Current Source we recommend that the unit be powered up and the LASER output be off OUTPUT ON LED unlit In ...

Page 33: ...y set The interlock pins 1 and 2 on the LASER connector must be shorted in order to turn on the LASER output current Figures 2 4 2 7 show the possible configuration of connecting laser diodes and photodiodes with the LDX 3500 Series Precision Current Sources Figure 2 4 Common Laser Cathode Photodiode Cathode Figure 2 5 Common Laser Cathode Photodiode Anode Bias 3500 Series Precision Current Source...

Page 34: ...omentary circuit break and remake before the final circuit break Therefore although the LDX 3500 Series Precision Current Source provides a proprietary debounce protection circuit for LASER output secure cabling is important It is recommended that the connections to the LDX 3500 Series Precision Current Source output be made using twisted wire pairs with an earth grounded shield see Figures 2 4 2 ...

Page 35: ... above the main 9 pin D sub connector Many laser diode modules contain an internal photodiode that monitors the back facet emission of the laser Usually this photodiode is internally connected to either the laser anode or cathode Figures 2 4A 2 4D show the recommended connections and shielding for the various configurations of laser diode modules and photodiode feedback schemes The photodiode and ...

Page 36: ...stage will be off at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut off Press the ENBL switch in the ADJUST section of the front panel so that the indicator is lit adjustment enabled Press the MODE switch until the I CW or I HBW high bandwidth mode is selected Press the RANGE switch until the desired current range is select...

Page 37: ...d check the setting of P LIMIT to ensure that it is as desired If not turn the adjust knob until the power limit is correct Press the PARAMETER switch again and check the setting of CAL PD to ensure that it is as desired If not turn the adjust knob until the CAL PD value matches the responsivity of your monitor photodiode Press the DISPLAY switch and check the set point operating power If it requi...

Page 38: ...LDX 3500 Series Precision Current Source To avoid electric shock do not perform any of the procedures described in this chapter unless you are qualified to do so Qualified service personnel are required to wear protective eyeglasses and anti static wrist bands while working on the LDX 3500 Series Precision Current Source circuit boards High voltages are present on and around the printed circuit bo...

Page 39: ... Environmental Conditions Calibrate this instrument under laboratory conditions We recommend calibration at 23 oC 1 0 oC When necessary however the LDX 3500 Series Precision Current Source may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 to 40 o C Description Manufacturing Model Specification DMM HP 3457A DC Amps 1 0 A 0 02 Resistan...

Page 40: ...alibration which prevents its normal completion the calibration may be aborted with no ill effects by simply turning the power off Then at power up the old calibration values will be initialized and the user may re calibrate This is possible because the calibration values are not saved to non volatile memory until the last step of calibration If an open circuit condition occurs during calibration ...

Page 41: ...s made Release the ADJUST ENBL switch to accept the first calibration point After the ADJUST ENBL switch is released the LDX 3500 Series Precision Current Source will apply the second calibration current approximately one fourth of the original current For example if the first calibration set point was 800 mA the second set point will be about 200 mA If a voltage measurement is used calculate the ...

Page 42: ...stance A 4 point probe resistance measurement is recommended Set the LDX 3500 Series Laser Diode Current Source s mode to P Set the current range to the lower output range Set the current limit I LIMIT to 80 of full scale Set the P LIMIT to 100 of full scale Power limit may be ignored during calibration Set the power set point to 4 000 mW LDX 3525 or 8 000 mW LDX 3545 or 40 00 mW LDX 3565 and set ...

Page 43: ...lculate the second calibration current as in Step a After the value on the display is stable has not changed by more than one digit for several seconds the LDX 3500 Series Precision Current Source is ready for the second actual IPD value to be entered When it the set point value is stable press and hold in the ADJUST ENBL switch and turn the ADJUST knob until the display indicates the same current...

Page 44: ...Power on but no current output Check the Interlock and back panel ENABLE key switch If OPEN CIRCUIT indicator is lit check the load connections and then try again On the LDX 3565 an OPEN error may be indicated as a result of internal overheating Check the OUTPUT ON switch the LED should be lit Unable to adjust output Check the ADJUST ENBL switch the indicator must be lit for any adjustments to be ...

Page 45: ...mit The power limit is not a hardware limit it only serves as a warning that the power measurement has exceeded the limit set point Power Limit Indicator does not work in CW or IHBW modes Power limit is not detected in the constant current modes Open Circuit Error occurs during calibration Check load connections check that meter does not auto range use non auto ranging modes Calibration is aborted...

Page 46: ...86 9405 Cheshire England CW6 9UY Phone 44 1829 733 305 DECLARATION OF CONFORMITY Application of Council Directive s 89 336 EEC EMC Directive 73 23 EEC Low Voltage Directive Manufacturer s Name ILX Lightwave Corporation Manufacturer s Address P O Box 6310 31950 E Frontage Road Bozeman Montana 59771 Equipment Type Environment Power Supply Class I Laboratory Model Name LDX 35X5 LD Current Sources inc...

Page 47: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

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