Model 2520INT Integrating Sphere Quick Start
Contents
1. Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 KOREA 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Postbus 559 4200 AN Gorinchem 0183 635333 Fax 0183 630821 SWEDEN c o Regus Business Centre Frosundaviks All 15 4tr 169 70 Solna 08 509 04 679 Fax 08 655 26 10 SWITZERLAND Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 TAIWAN 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031 4 02 Model 2520INT Integrating Sphere Quick Start Guide 2002 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A First Printing April 2002 Document Number 2520INT 903 01 Rev A Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of t2. eese 2 3 Figure 2 3 Divergent beams eee et ee e lievito aaa 2 4 Figure 2 4 Collimated bea imns oc eite endete 2 4 Figure 2 5 Horizontal and vertical acceptance angle 2 5 3 Maintenance List of Tables 1 2 Table 2 2 Table 2 1 Table 2 3 Table 2 5 Table 2 4 3 General Overview Getting Started Command summary for 2520INT connected to Detector 1 2 7 Remote voltage bias and detector polarity measurement commands to bias 2520INT sess 2 7 Typical sphere responsivity eee 2 8 Programming example using MX B math for optical power with a reverse bias ssseseseee 2 10 Remote MX B commands used to calculate optical power 2 10 Maintenance General Overview 1 2 General Overview Model 2520INT Quick Start Guide General Information Warranty information Warranty information is lcoated at the front of this guide Should your Model 2520INT require warranty service contact te Keithley representative or authorized repair facility in your area for further information When returning the unit for repair be sure to fill out and include the service form at the back of this guide to provide the repair facility with the necessary information Contact information Worldwide phone numbers are listed at the back of this guide if you have any questions please contact your local Keithley representative or call one of our application eng
3. er disconnect device must be provided in close proximity to the equipment and within easy reach of the operator For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting ca 5 02 bles or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Al ways make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating in formation and as shown on the instrument or test fixture panels or switching card When fuses are used in a product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under te
4. CALC3 KMAT MMF M value CALC3 STAT ON CALC3 DATA Set detector 1 B value for MX B math Setdetector 1 M value for MX B math Enable detector 1 math Query detector 1 math data Set detector 2 B value for MX B math Set detector 2 M value for MX B math Enable channel 2 math Query channel 2 math data Programming example Table 2 5 summarizes the basic command sequence for optical power measurements using MX B with detector 1 These commands set up the Model 2520 as follows e Measurement range l0mA Math function MX B enabled e Responsivity M 2 Dark current B 0 5 Bias voltage 5V Table 2 5 Programming example using MX B math for optical power with a reverse bias Command Description RST Restore GPIB defaults SENS2 CURR RANG 0 01 10mA range CALC2 KMAT MMF 2 M 2 CALC2 KMAT MBF 0 5 B 0 5 CALC2 STAT ON Enable detector 1 math SOUR2 VOLT 5 Detector 1 bias voltage 5V OUTPI ON Turn on outputs INIT Trigger reading CALC2 DATA Request detector 1 reading OUTP1 OFF Turn off outputs Unit must be addressed to talk after CALC2 DATA Saving and restoring user setups See the Model 2520 User s Manual Section 1 for details on how to save and recall up to 5 commonly used configurations 3 Maintenance 3 2 Maintenance Model 2520INT Quick Start Guide Handling and cleaning precautions Dust Cover the optical port opening when not in
5. Indicator SMA Connector Operating Wavelength Range 800 1700nm Continuous Wave CW Calibration Wavelength Range 950 1010nm and 1280 1620nm HW 6 06 02 Rev A Wavelength nm 980 1310 1480 1550 Measurable Optical Power Range 5 29mW 7W 17mW 4W 14 5mW 3 5W 13 5mW 3W Typical Responsivity mA W 3 5 6 0 7 0 7 5 Resolution mW 0 2 0 1 0 1 0 1 Maximum Reverse Bias 5V recommended Dark Current at Max Reverse Bias 4uA typ 101A max Photodiode Electrical Connections on 3 Lug Triax g Center Conductor Inner Shield Fox Photodiode Outer most Shield NC Pulsed Operation Center to Cathode Center Shield to Anode Outer Shield Not Connect Isolated from chassis The 2520INT supports the pulse capabilities of the 2520 Pulsed Laser Diode Test System Fiber Tap Port Connector Type SMA Numerical Aperature NA 0 22 typ Multi Mode Patch Cord Core Diameter um Typical Attenuation dB 400 39 5 100 S9 62 5 58 2 50 63 HW 6 06 02 Rev A General Description Min Max Temperature Operating 0 C 50 C Storage 25 C 65 C Weight 0 33 Ibs 0 15 kg Dimension LxDxH 2 36 inx 1 80 inx 3 40 in 60 0 mm x 45 7 mm x 86 4 mm Input Port Diameter 0 25 in 6 35 mm Recommended Calibration Cycle 1 year Notes Maximum distance from input port to
6. Inspection 1 4 Instrument setup 2 6 Laser safety precautions 1 3 Maintenance 3 1 Optical power measurements 2 8 range 2 6 Remote instrument setup 2 6 Safety symbols and terms 1 2 Saving and restoring user setups 2 10 Specifications 1 2 Triax cable 1 4 voltage bias 2 6 Warranty information 1 2 Service Form Model No Serial No Date Company List all control settings describe problem and check boxes that apply to problem Q Intermittent C Analog output follows display C Particular range or function bad specify C IEEE failure CJ Obvious problem on power up CJ Batteries and fuses are OK C Front panel operational U All ranges or functions are bad C Checked all cables Display or output check one C Drifts C Unable to zero C Unstable C Overload C Will not read applied input C Calibration only CJ Certificate of calibration required C Data required attach any additional sheets as necessary Show a block diagram of your measurement including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user please describe Be sure to include your name and phone number
7. accept at full maximum acceptance angle 3 1mm 0 12 in 2 Calibration performed at 10nm wavelength intervals Based on detector being linear to up to 25mA photocurrent and on a Signal to Noise Ratio SNR 2 100 Calibration of the 2520INT is performed with an open fiber tap port The power measurement will increase by approximately 1 with an SMA patch cord attached to the port Based on resolution of Model 2520 at 10mA lowest Imeas range This configuration MUST have a NEGATIVE Reverse Bias Voltage applied If a Positive Forward Bias is applied the detector photodiode will become damaged Use of Single Mode Fiber is Not Recommended Only for integrating head does not include post and base HW 6 06 02 Rev A Table of Contents 1 General Overview General Information esee 1 2 Warranty information eeeeeseeeeeeeeeeeeeene enne nnne 1 2 Contact information esee eene 1 2 Specifications eee erret tre rt ERROR 1 2 Safety symbols and terms eese 1 2 Laser safety precautions sese 1 3 Inspection eder eee tpa e e ette tee dio 1 4 Optional accessories rnense i ee 1 4 Product Overview ute a e E E EEES 1 5 Available models nee ser 1 5 Configuration sa so stehn a reete he dee ene eie 1 5 2 Getting Started Electrical connections to Pertenece 2 2 Detector output terminals essere 2 2 Connection
8. must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products Only properly trained service personnel may perform installation and service procedures Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation Category II as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high tran sient over voltages Installation Category II connections require protection for high transient over voltages often associated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category I sourc es unless otherwise marked or described in the Manual Exercise extreme caution when a shock hazard is present Letha
9. on this service form BE USA pment TEauip ont An Interworld Highway LLC Company Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 e www keithley com Sales Offices BELGIUM Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 FINLAND Tiet j ntie 2 02130 Espoo Phone 09 54 75 08 10 Fax 09 25 10 51 00 FRANCE 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519 INDIA Flat 2B Willocrissa 14 Rest House Crescent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 KOREA 2FL URI Building 2 14 Yangja
10. the Model 7078 TRX triax cable to the Model 2520INT detector output connector 2 Connect the other end of the Model 7078 TRX triax cable to the desired Model 2520 DETECTOR jack CAUTION Do not attempt to connect BNC connectors to the Model 2520INT triax detector output jack Attempting to do so may damage the connector voiding the warranty Model 2520INT Quick Start Guide Getting Started 2 3 Figure 2 2 Electrical connections 7078 TRX Detector Triax Cable o A Detector Q e eee A eremum a Model 2520INT NES Integrating Sphere Model 2520 Testhead Connections to DUT Free space operation and alignment considerations For free space operation position the Model 2520INT as close as possible to the DUT Proper alignment of the Model 2520INT to the light source under test is important for optimum optical power measurement Key considerations include divergent beams colli mated beams and full beam collection Divergent beams Devices such as diode chips and bars have divergent beams As shown in Figure 2 3 the beam diameter increases as distance from the source increases If improperly placed the port could block some of the entrance beam and lead to inaccurate power measurement To avoid inaccurate measurements the large and small divergence angles of a diode laser source should be aligned as indicated b
11. 2520INT specifications for product list and key characteristics Configuration As shown in Figure 1 1 the 2520INT consists of a sphere housing detector and mounting holes Key components include Detector output 3 lug female triax connector to connect the unit to the Model 2520 Pulsed Laser Diode Test System Optical input port accepts light from optical source Fiber tap port may be used to tap off light into a 0 22 NA SMA fiber customer provided Mounting holes allows standard mounting in M6 or 14 x 20 NOTE Specifications are subject to change without notice Figure 1 1 Model 2520INT configuration 90 Full Angle FA Indicator Detector Output Toll Detector E Output 50 FA Indicator Mounting Hole SMA Connector 2 Getting Started 2 2 Getting Started Model 2520INT Quick Start Guide Electrical connections Detector output terminals Figure 2 1 shows the configuration of the detector output terminals Note that center con ductor is the cathode while the inner shield is connected to the anode Figure 2 1 Detector terminals f Cathode Internal Center Photodiode Conductor Detector Anode i i Inner Shield Outer Shield Detector Output Jack i Model 2520INT Connections to Model 2520 Using Figure 2 2 as a guide make electrical connections to the desired Model 2520 channel as follows 1 Connect one end of
12. IMPLIED INCLUD ING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 e www keithley com Sales Offices BELGIUM Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 FINLAND Tiet j ntie 2 e 02130 Espoo Phone 09 54 75 08 10 Fax 09 25 10 51 00 FRANCE 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519 INDIA Flat 2B Willocrissa 14 Rest House Crescent
13. Its value is based on many factors including the reverse bias voltage on the detector tempera ture semiconductor architecture and even the quality of the semiconductor material itself Proper measurement of and compensation for the dark current will ensure accurate optical power measurements 2 8 Getting Started Model 2520INT Quick Start Guide Typical responsivity values are summarized in Table 2 3 Table 2 3 Typical sphere responsivity Typical Responsivity mA W Sphere 980nm 1550nm Germanium 3 5 TS Measuring dark current Connect the Model 2520INT to the desired Model 2520 detector channel Cover the optical input port of the Model 2520INT with a dust free lightproof cover Light leakage will result in erroneous dark current measurements and will effect the overall accuracy of absolute power measurements De o9 Optical power measurements Optical power calculation Note the detector current reading Optical power is calculated as follows From the Model 2520 front panel press the CONFIG FILTER key Enter the number of readings to average 1 100 Turn on the outputs then press TRIG Optical power measured 7 Idark current Responsivity Where Imeasured measured photodiode current amps Igark current Photodiode dark current in amps see above Responsivity amps watt see supplied Model 2520INT calibration constants Model 2520INT Quick Start Guide Getting Started 2 9 Conf
14. KEI I HLEY Model 2520INT Integrating Sphere Quick Start Guide TEquipment An Interworld Highway LLC Company A GREER MEASUR EESIEME ONFIDENCE WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be defective To exercise this warranty write or call your local Keithley representative or contact Keithley headquarters in Cleveland Ohio You will be given prompt assistance and return instructions Send the product transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period or at least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to follow instructions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR
15. be purchased only through Keithley Instruments to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Products that consist of a circuit board with no case or chassis e g data acquisition board for installation into a computer should never require cleaning if handled accord ing to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing 2520INT Series Specifications This series covers the offering of Integrating Spheres for use with the Model 2520 Pulser Test System Products The following lists the current products in the 2520INT Series Each product has bundled a CD Manual Calibration report and 14 20 post and base e 2520INT 1 GE lin Integrating Sphere with a Germanium Detector Accessories e Model 2520 Pulsed Laser Diode Test System e Model 7078 TRX Triax Cables Specifications Full Acceptance Angle 90 vertical 50 horizontal max Frontal View of Integrating Sphere showing Full Acceptance Angle Indicators 90 Full Angle FA Indicator Detector Output 50 FA
16. e Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Postbus 559 4200 AN Gorinchem 0183 635333 Fax 0183 630821 SWEDEN c o Regus Business Centre Frosundaviks Alle 15 4tr 169 70 Solna 08 509 04 679 e Fax 08 655 26 10 SWITZERLAND Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 TAIWAN 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031 Copyright 2001 Keithley Instruments Inc Printed in the U S A 4 02
17. from radiation and electrical hazards at all times The installer must comply with all applicable laws and regulation on laser safety This requirement includes warning signs and oper ator training Where an interlock is required for safe operation the test fixtures must ensure that the interlock circuit is disabled source outputs inhibited when the operator can be exposed to radiation The test fixture interlock must not be defeated under any operating conditions When servicing the test system any required personnel protection equipment e g laser safety goggles must be provided by the cus tomer s responsible body The customer s laser safety officer LSO must review and approve all installations before being put into operation Any safety con cerns must be immediately reported to the customer s LSO When making connections do not leave any exposed connections Be sure that all external circuits are properly insulated WARNING Itis the responsibility of the customer to operate instruments in a safe manner Follow all applicable safety regulations for installing config uring and using the Model 2520 The Model 2520 as installed should be approved by the appropriate safety personnel such as the responsi ble Laser Safety Officer or equivalent Suggested starting points for workplace regulations and standards ANSI Z136 1 IEC 825 OSHA 29 CFR 1910 In short always be aware of workplace hazards strive to minimize the
18. he Model 2520 can be set up for remote detector bias and detector current measure polar ity by using the commands summarized in the Table 2 1 Model 2520INT Quick Start Guide Getting Started 2 7 iuc ms bias and detector polarity measurement commands to bias 2520INT Command Description SOURce2 VOLTage voltage Set detector 1 source voltage 0 to 20 SOURce3 VOL Tage voltage Set detector 2 source voltage 0 to 20 SENSe2 CURRent RANGe range Set detector 1 measure range 0 01 0 02 0 05 0 1 SENSe2 CURRent POLarity polarity Set detector 1 measure polarity SENSe3 CURRent RANGe range Set detector 2 measure range 0 01 0 02 0 05 0 1 SENSe3 CURRent POLarity polarity Set detector 2 measure polarity Programming example Table 2 2 summarizes the commands for the 2520INT connected to Detector 1 These commands set up the Model 2520 as follows Measurement range l0mA Bias Voltage 5V Measurement polarity Positive Table 2 2 Command summary for 2520INT connected to Detector 1 Command Description SENS2 CURR RANG 0 01 Detector 1 measurement range at l0mA SENS2 CURR POL POS Detector 1 measurement polarity positive SOUR2 VOLT 5 Detector 1 bias 5V CAUTION Applying voltage greater than 5V or 5V can damage the Model 2520INT Detector dark current measurements Description The dark current is a current offset produced by the detector in the absence of light
19. he manual are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 2520INT 903 01 esses April 2002 All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders KESI Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some instruments and accessories would normally be used with non hazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read and follow all installation operation and maintenance information carefully before us ing the product Refer to the manual for complete product specifications If the product is used in a manner not specified the protection provided by the product may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equip ment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They
20. iguring optical power measurements 1 Press CONFIG then MATH 2 Select channel to configure CHANNEL 2 Detector Channel 1 CHANNEL 3 Detector Channel 2 NOTE CHANNEL I Voltage Sense Measurement Channel and is therefore not used for Optical Power Measurements 3 Enter 1 Responsivity W A of sphere for device wavelength as M Responsivity values are supplied with your 2520INT Reference values are also given in Table 2 1 4 Enter sphere dark current as B 5 Select units as W for Watts 6 Configure other channel as above if needed Initiating optical power measurements 1 Select channel to initiate by pressing I q for the desired detector channel The selected channel is denoted by an asterisk on the second display line of the Model 2520 mainframe 2 Press the MATH button 3 Initiate the MATH function for the other channel if needed Remote instrument setup Basic optical power commands The Model 2520 can be set up for remote optical power measurements by using the MX B commands summarized in Table 2 5 See Sections 4 and 14 of the Model 2520 User s Manual for details on using these and other commands necessary for complete measurements 2 10 Getting Started Table 2 4 Model 2520INT Quick Start Guide Remote MX B commands used to calculate optical power Command Description CALC2 KMAT MBF B value CALC2 KMAT MMF lt M_ value CALC2 STAT ON CALC2 DATA CALC3 KMAT MBF B value
21. ineers at 1 800 348 3735 U S and Canada only Additional information may be obtained at www keithley com Specifications Model 2520INT specifications shown at the front of this guide were current at the time of duplication but they are subject to change without notice For the most recent specifica tions refer to the web site at www keithley com Safety symbols and terms The following symbols and terms may be found on an instrument or used in this guide The A symbol on an instrument indicates that the user should refer to the operating instructions located in the guide The A symbol on the instrument shows that high voltage may be present on the termi nal s Use standard safety precautions to avoid personal contact with these voltages The WARNING heading used in this guide explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading used in this guide explains hazards that could damage the instru ment Such damage may invalidate the warranty Model 2520INT Quick Start Guide General Overview 1 3 Laser safety precautions WARNING While the Model 2520INT does not incorporate a laser it is designed to be used with laser diode devices The following safety practices must be used to protect operators and other users of this product from potential exposure to laser radiation Operators must be protected
22. l voltage may be present on cable connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock If the circuit is capable of operating at or above 1000 volts no conductive part of the circuit may be exposed Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sourc es NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective de vices to limit fault current and voltage to the card Before operating an instrument make sure the line cord is connected to a properly grounded power receptacle Inspect the con necting cables test leads and jumpers for possible wear cracks or breaks before each use When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input pow
23. m and work safely 1 4 General Overview Model 2520INT Quick Start Guide Inspection The Model 2520INT was carefully inspected before shipment After unpacking all items from the shipping carton check for any obvious signs of physical damage that may have occurred during transit Report any damage to the shipping agent immediately Save the original packing carton for possible future shipment The following items are included with every Model 2520INT order e Model 2520INT Integrating Sphere e Optoelectronics CD ROM that contains a PDF of this Quick Start Guide l4 x 20 post and base e Calibration report Optional accessories The following accessory is available to make connections to the Model 2520INT Triax cable The following cable is required to connect the Model 2520INT detector output to the input of the Model 2520 Pulsed Laser Diode Test System Model 7078 TRX Series Cable Low noise triax cable to connect the Model 2520INT to the Model 2520 Pulsed Laser Diode Test System Model 2520INT Quick Start Guide General Overview 1 5 Product overview The 2520INT series of integrating sphere based detectors are specifically designed to pro vide highly accurate light intensity measurements The integrating sphere simplifies pro duction testing of optical components by eliminating common measurement problems related to detector alignment beam profile polarization and back reflection Available models See the Model
24. s to Model 2520 sse 2 2 Connections to DUT eese enne 2 3 Free space operation and alignment considerations 2 3 Instrument Setup x teer eerte alas sinus 2 6 Detector voltage bias current measurement polarity ANG range 5 sse etos perder dri een 2 6 Configuring the Model 2520 voltage bias for Model 2520INT 4 8 22 22 22 adit es 2 6 Configuring the Model 2520 detector polarity for the Model 2520IN T A 0c eer ok cree e reete 2 6 Configuring the Model 2520 detector current measurement range for the Model 2520INT 2 6 Remote instrument setup uccsssesssnessnensnnssnennnnnnnnennnnnennnen 2 6 Detector dark current measurements sese 2 7 Descriptor erret Ter rete Eoi e eene 2 7 Optical power measurements euersnesnersnesnersesnensnennennennnn 2 8 Remote instrument setup cccsssesssnessnennnnsnnennnnnnnennnennnnnen 2 9 Saving and restoring user setups neennennenneennennensnennnnnnennne nenne 2 10 Maintenance Handling and cleaning precautions ee 3 2 Dust a etie eren d ae eO e ROREM 3 2 C Gang note hu euidenter ut etre TEN 3 2 Calibration eei lessecovacdevecasten E e eder esb iet eei do io 3 2 List of Illustrations 1 General Overview Figure 1 1 Model 2520INT configuration eene 1 5 2 Getting Started Figure 2 1 Detector terminals 2 0 2 2 Figure 2 2 Electrical connections
25. st Safe operation requires the use of a lid interlock If or 4 is present connect it to safety earth ground using the wire recommended in the user documentation The PAS symbol on an instrument indicates that the user should refer to the operating instructions located in the manual The JN symbol on an instrument shows that it can source or measure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety precautions to avoid personal contact with these voltages The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the war ranty Instrumentation and accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety ap provals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should
26. tion time permitting the 2520INT to respond to the 100 ns or less rise time of the Model 2520 s pulses The recommended bias is 5V The necessary trade off for using the bias is an increase in the dark current See the following information for dark current measurement and compensation The 2520INT is configured to output positive current to the 2520 Since the Model 2520 detector channels are unipolar the channel utilized for the 2520INT must have its polarity set to positive For most applications the 2520INT will output lt 10mA so the current measure range on the Model 2520 should be set to 10 mA Configuring the Model 2520 voltage bias for Model 2520INT Press Vg for the detector channel connected to the 2520INT Use the lt and keys to move the blinking value to the desired position Use the A and W keys to set the voltage to 05 00V Press ENTER when correct value is displayed Voltage is applied to detector chan nel only when the Model 2520 output is on Io der Configuring the Model 2520 detector polarity for the Model 2520INT 1 Press CONFIG then Vg for the desired channel DETECTOR 1 or DETECTOR 2 2 Use the lt and gt keys to make POSITIVE the blinking value 3 Press ENTER Configuring the Model 2520 detector current measurement range for the Model 2520INT 1 Press IPD for the detector channel connected to the 2520INT 2 Press the RANGE Y key until the 10mA range is reached Remote instrument setup T
27. use to prevent internal contamination of the Model 2520INT Inconsistencies on the internal surface of the sphere will cause inaccura cies in measurements Cleaning Clean any exposed connector using a cleaning kit supplied by the connector manu facturer or high grade isopropyl alcohol and a cotton swab To clean with alcohol and a swab dab the tip of a cotton swab in alcohol and then shake off any excess alcohol The tip should be moist not dripping wet Stroke the swab tip gently across the surface of the connector and around the connector fer rule Either allow the connector a minute to dry or blow dry the connector using clean compressed air Be careful when using compressed air because improper use may deposit a spray residue Calibration The Model 2520INT should be calibrated once a year Contact your Keithley representa tive or call the factory directly to inquire about these services Index accessories 1 4 alignment considerations 2 3 Calibration 3 2 Collimated beams 2 4 Configuration 1 5 connections 2 2 Connections to Model 2520 2 2 Contact information 1 2 current measurement polarity 2 6 detector current measurement range 2 6 Detector dark current measurements 2 7 Detector output terminals 2 2 detector polarity 2 6 Detector voltage bias 2 6 Divergent beams 2 3 Free space operation 2 3 Full beam collection 2 5 General Overview 1 1 Getting Started 2 1 Handling and cleaning precautions 3 2
28. y the markings at the sphere entrance port 2 4 Getting Started Model 2520INT Quick Start Guide Figure 2 3 Divergent beams Detector Entrance Port Light Source Collimated beams Collimated beams differ from divergent beams in that the edges of the beam are parallel As shown in Figure 2 4 the beam diameter stays constant even as the distance from the source increases Figure 2 4 Collimated beams Detector Entrance Port Light Spe DESEE RENE Model 2520INT Quick Start Guide Getting Started 2 5 Full beam collection Full beam collection is important for optimum optical power measurement Figure 2 5 The maximum acceptance angle of the sphere in the vertical direction is 45 half angle divergence from the entrance port The maximum acceptance angle of the sphere in the horizontal direction is 25 half angle from the entrance port NOTE Information provided is based on the sphere orientation shown in Figure 2 5 Figure 2 5 Horizontal and vertical acceptance angle Input Port NOTE Distance for full acceptance at the maximum acceptance angles should not exceed 3 1mm from input port 2 6 Getting Started Model 2520INT Quick Start Guide Instrument setup Detector voltage bias current measurement polarity and range Using a reverse bias on the 2520INT is critical for good pulse measurement performance The reverse bias reduces the capacitance of the detector in the 2520INT which greatly speeds up the reac
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