Keithley 2520, Quick Reference Manual

Page 1: ...Model 2520Pulsed Laser Diode Test System Quick Reference Guide A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 2: ...IRECT 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 SUC...

Page 3: ...Model 2520 Pulsed Laser Diode Test System Quick Reference Guide 2001 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing March 2003 Document Number 2520 903 01 Rev B...

Page 4: ...ly into the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual...

Page 5: ...ected 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 localAC m...

Page 6: ...ersonal 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 performi...

Page 7: ...odiode detector source values 1 6 Display format 1 7 Display example 1 7 Display units 1 7 Basic connections 1 8 Testhead connections 1 9 Interlock connections 1 10 Typical test connections 1 11 Conne...

Page 8: ...thead front panel 1 3 Figure 4 Testhead rear panel 1 4 Figure 5 Testhead connections 1 9 Figure 6 Remote interlock connections 1 10 Figure 7 Laser diode test connections 1 12 Figure 8 Linear staircase...

Page 9: ...test programming example 1 15 Table 5 Filter commands 1 17 Table 6 Filter programming example 1 17 Table 7 Commands for linear and log staircase sweeps 1 22 Table 8 Custom list sweep commands 1 22 Tab...

Page 10: ...ance DUT testing and 4 More testing techniques This format allows a new user to easily progress from basic simple operation to more complex procedures Remote command programming For the various Model...

Page 11: ...measure Source bias voltage on each of two channels from 0V to 20V Measure current on each of two channels from 0 7 A to 105mA Maximum current for each bias source is 100mA Front and rear panels The...

Page 12: ...TESTHEAD CONN 2 CAT I WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FUSE WITH SAME TYPE AND RATING MAD...

Page 13: ...source pulse mode Press CONFIG press LASER IL select SHAPE select PULSE The above sequence is explained as follows 1 Press the CONFIG key 2 Press the LASER IL key 3 Select the SHAPE menu item 4 Select...

Page 14: ...ssed within a few seconds the edit mode will be cancelled automatically COMPL allows editing of the laser diode current source voltage compliance EDIT and places the display cursor on the display digi...

Page 15: ...rce amplitude to the desired level For the pulse mode this value will be the high pulse level 11 Press the COMPL key then set the voltage compliance limit to the desired value Press ENTER to complete...

Page 16: ...e source value on the top line and the laser diode voltage detector 1 current and detector 2 current from left to right on the bottom line Ipulse 100 00mA 1 0000 V 05 000mA 10 000mA Display units Meas...

Page 17: ...peration unless authorized by the responsible body This requirement must be part of the facilities administrative controls for laser safety When servicing the test system any required personnel protec...

Page 18: ...ctor ENABLED DISABLED PULL TO REMOVE 1 9 ENABLED DISABLED BOTH INTERLOCKS MUST BE ENABLED TO OPERATE MAINFRAME CONN 1 MAINFRAME CONN 2 REMOTE INTERLOCK INTERLOCK STATUS LASER POWER ON GREEN ENABLED RE...

Page 19: ...een pins 1 and 5 The switch must be configured to close contacts ENABLED to operate The key must also be inserted into KEY INTERLOCK and rotated to the ENABLED position to operate the unit WARNING If...

Page 20: ...ard photodiode detector The CURRENT INPUT center conductor is connected to one photodiode terminal while the BIAS terminal inner shield is connected to the other photodiode terminal Connection conside...

Page 21: ...tion SENSe 1 VOLTage POLarity polarity SENSe2 CURRent POLarity polarity SENSe3 CURRent POLarity polarity SOURce 1 CURRent POLarity polarity Set laser diode measure polarity POSitive or NEGative Set de...

Page 22: ...procedure Procedure Details 1 Select current source function Press CONFIG then LASER IL Choose SHAPE then select DC or PULSE For PULSE mode only set LOW current then use PW and DELAY keys to set pulse...

Page 23: ...URRent LOW low_current SOURce2 VOLTage voltage SOURce3 VOLTage voltage Turn all sources on or off ON or OFF Trigger and acquire readings Set laser diode voltage measure range 5 or 10 Set laser diode m...

Page 24: ...T POL POS SENS2 CURR POL NEG SENS3 CURR POL NEG SOUR1 CURR RANG 0 5 SOUR1 CURR 0 5 SOUR1 VOLT PROT 5 SOUR1 CURR POL POS SOUR1 FUNC PULS SOUR1 PULS DEL 200e 6 SOUR1 PULS WIDT 10e 6 SOUR1 CURR LOW 10e 3...

Page 25: ...three measurements The number of readings averaged can be set between 1 and 100 However the more filtering that is used higher number of readings averaged the slower the measurement process becomes W...

Page 26: ...COUNt count SENSe 1 AVERage STATe state SENSe2 AVERage COUNt count SENSe2 AVERage STATe state SENSe3 AVERage COUNt count SENSe3 AVERage STATe state Set average filter count 1 to 100 Enable disable av...

Page 27: ...l go to the start source current level The output will then change in equal steps until the stop source level is reached The time duration at each step is determined by the time it takes to perform th...

Page 28: ...om 1 to 10mA With the desired source V or I selected use the following menu sequence to set the start and stop levels and the number of sweep points 2 to 1000 Press CONFIG press SWEEP select TYPE sele...

Page 29: ...d be the same size as the current list However if the pulse width and or pulse delay list is shorter than the current list the last pulse width and or delay point will be used for all subsequent curre...

Page 30: ...he RECALL key to access stored readings Performing a log staircase sweep Perform the following steps to run a log staircase sweep 1 Configure the laser diode and detector source and measure functions...

Page 31: ...urrent is 5A Table 8 Custom list sweep commands Command Description SOURce 1 CURRent MODE LIST SOURce 1 LIST CURRent I list SOURce 1 LIST CURRent APPend I list SOURce 1 LIST CURRent POINts SOURce 1 LI...

Page 32: ...1 Select linear staircase sweep Detector 1 bias 5V Detector 2 bias 5V Turn on source outputs Trigger sweep request data Turn off source outputs 1This command should normally be sent after START STOP...

Page 33: ...FIG press MATH select CHANNEL1 select I V Press MATH The laser diode measurement field on the bottom line will display conductance Resistance This math function computes the resistance using the ratio...

Page 34: ...EL2 or CHANNEL1 select MX B_UNIT CHANNEL1 only Enter M B and units at the prompts Press MATH The measurement field s on the bottom line will display the MX B value Delta remote only This math function...

Page 35: ...ulate3 KMATh MUNits units CALCulate3 STATe state CALCulate4 DATA CALCulate4 STATe state INIT Request laser diode math reading Set laser diode math function MXB 1 CONDuctance 1 POWER 1 or RESistance 1...

Page 36: ...5e 3 CALC2 KMAT MMF 0 5 CALC2 STAT ON OUTP1 ON INIT CALC1 DATA CALC2 DATA OUTP1 OFF Select laser diode power function Set W math units Enable laser diode math Detector 1 MX B offset B 5e 3 Detector 1...

Page 37: ...1 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...