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4-12

Troubleshooting

Model 2520 Pulsed Laser Diode Test System Service Manual

Figure 4-4

Digital circuitry block diagram

Data From A/D

Converters

To Current and Voltage

Source Control DACs

ROM

U3, U4

RAM

U2, U17

Reset

E   PROM

U13

2

DSP

U47

Microprocessor

U15

Serial

Interface

U20

GPIB

U5, U6

U19

RS-232 Interface

IEEE-488 Interface

To Display

Board Controller

Trigger

U46,

Q6-Q11

Digital I/O

U35

Trigger

Link

Digital

I/O

16.78MHz

SRAM

U27, U29

U38-U42,

U49

Summary of Contents for 2520

Page 1: ...902 01 Rev B January 2006 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 www keithley com Model 2520 Pulsed Laser Diode Test System Service Manual 2520 902 01 Rev B January 2006 A G R E A T E...

Page 2: ...n without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non recharge able batteries damage from battery leakage or problems ar...

Page 3: ...Model 2520 Pulsed Laser Diode Test System Service Manual 2001 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing January 2006 Document Number 2520 902 01 Rev B...

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

Page 5: ...cted to mains voltage or to voltage sources with high transient over voltages Measurement Category II connections require protection for high transient over voltages often as sociated with local AC ma...

Page 6: ...ages The symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated informa...

Page 7: ...e accuracy 1 9 Current measurement accuracy 1 13 Voltage bias source accuracy 1 15 2 Calibration Introduction 2 2 Environmental conditions 2 4 Temperature and relative humidity 2 4 Warm up period 2 4...

Page 8: ...tions 4 2 Repair considerations 4 2 Power on self test 4 3 Front panel tests 4 3 KEYS test 4 3 DISPLAY PATTERNS test 4 3 CHAR SET test 4 4 Principles of operation 4 4 Overall block diagram 4 5 Analog...

Page 9: ...2 Component layouts 6 2 A Specifications Accuracy calculations A 8 Measurement accuracy A 8 Source accuracy A 8 B Calibration Reference Introduction B 2 Command summary B 2 Miscellaneous commands B 3...

Page 10: ......

Page 11: ...for DETECTOR 2 voltage bias source verification tests 1 16 2 Calibration Figure 2 1 Testhead connections 2 10 Figure 2 2 Voltage measurement calibration connections 2 12 Figure 2 3 Current source cali...

Page 12: ...ages and commands 2 25 Table 2 10 Remote current source calibration summary 2 27 Table 2 11 Remote pulse low calibration summary 2 29 Table 2 12 Remote voltage bias source calibration summary 2 31 Tab...

Page 13: ...1 PerformanceVerification...

Page 14: ...stem accuracy is within the limits stated in the instrument s one year accuracy specifications You can perform these verification procedures When you first receive the instrument to make sure that it...

Page 15: ...administrative controls for laser safety Outputs cannot be turned on with the key removed When servicing the test system any required personnel protection equipment e g laser safety goggles must be pr...

Page 16: ...ative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2520 to warm up for a minimum of one hour before conducting the verification procedures If the instrument has been...

Page 17: ...librator Fluke 5700A1 DC Voltage 5V 10V 5ppm 5ppm Digital Multimeter Keithley 20012 DC Voltage Resistance 20V 20 200 2k 22ppm 59ppm 43ppm 37ppm Precision Resistors3 1 2 to 1 6 5W 5 4 10 to 15 5W 5 4 2...

Page 18: ...lculated reading limits are Limits 10mA 10mA 0 3 20 A Limits 10mA 30 A 20 A Limits 10mA 50 A Limits 9 95mA to 10 05mA Restoring factory defaults Before performing the verification procedures restore t...

Page 19: ...V DC Exceeding this value may cause a shock hazard Testhead connections The Model 2520 mainframe must be connected to the testhead in order to perform the verification procedures Using Figure 1 1 as a...

Page 20: ...SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FUSE WITH SAME TYPE AND RATING MADE IN U S A IEEE 488 CHANGE IEEE ADDRESS WITH FRONT PANEL MENU DIGITA...

Page 21: ...520 and calibrator and allow them to warm up for a minimum of one hour 3 Restore BENCH defaults as covered previously in Restoring factory defaults on page 1 6 4 Press the LASER VL key then select the...

Page 22: ...head CURRENT OUTPUT jacks as shown in Figure 1 3 NOTE See Figure 1 4 and Figure 1 5 for mounting and connections of parallel resistors 2 Turn on the Model 2520 and DMM and allow them to warm up for a...

Page 23: ...NPUT LO SENSE W 4 WIRE INPUTS 350V PEAK 1100V PEAK AUTO CURRENT OUTPUT VOLTAGE SENSE CAT I DETECTOR 1 DETECTOR 2 BIAS CURRENT INPUT ISOLATION FROM EARTH 10V MAX HI HI LO LO Model 2520 Testhead CURRENT...

Page 24: ...age value and characterized resistance value I V R Recalculate reading limits from these values then verify that the current is within those limits 10 Replace the 10 to 15 resistor with the characteri...

Page 25: ...istor 500mA Range 20 RN60 Type 300W in Parallel 1 2 to 1 6W Resistor 5A Range 10 RN60 Type 16W in Parallel 10W Cable SC 182 20cm Tie Shields Together BNC Cables Table 1 3 Current source verification l...

Page 26: ...NU HI INPUT LO SENSE 4 WIRE INPUTS 350V PEAK 1100V PEAK AUTO CURRENT OUTPUT VOLTAGE SENSE CAT I DETECTOR 1 DETECTOR 2 BIAS CURRENT INPUT ISOLATION FROM EARTH 10V MAX HI HI LO LO Model 2520 Testhead Mo...

Page 27: ...minal values Recalculate limits from characterized resistance and measured voltage I V R 1 RN60 type 2k 2 2 RN60 type 2k in parallel 3 5 RN60 type 2k in parallel 4 10 RN60 type 2k in parallel Figure 1...

Page 28: ...REV POWER DISPLAY 2001 MULTIMETER DCV ACV DCI ACI 2 4 FREQ TEMP REL TRIG INFO LOCAL EXIT ENTER RANGE RANGE F R 500V PEAK FRONT REAR 2A 250V AMPS CAL STORE RECALL CHAN SCAN FILTER MATH CONFIG MENU HI I...

Page 29: ...FREQ TEMP REL TRIG INFO LOCAL EXIT ENTER RANGE RANGE F R 500V PEAK FRONT REAR 2A 250V AMPS CAL STORE RECALL CHAN SCAN FILTER MATH CONFIG MENU HI INPUT LO SENSE 4 WIRE INPUTS 350V PEAK 1100V PEAK AUTO...

Page 30: ......

Page 31: ...2 Calibration...

Page 32: ...o calibrate the Model 2520 Pulsed Laser Diode Test System These procedures require accurate test equipment to supply and measure precise DC currents and voltages Calibration can be performed either fr...

Page 33: ...less authorized by the responsible body This requirement must be part of the facilities administrative controls for laser safety Outputs cannot be turned on with the key removed When servicing the tes...

Page 34: ...e test equipment to warm up for the minimum time specified by the manufacturer Line power The Model 2520 requires a line voltage of 100V to 240V at line frequency of 50 or 60Hz The instrument must be...

Page 35: ...5700A1 DC Voltage 5V 10V 5ppm 5ppm Digital Multimeter Keithley 20012 DC Voltage DC Current Resistance 20V 2mA 20mA 200mA 20 200 2k 22ppm 320ppm 320ppm 320ppm 59ppm 43ppm 37ppm Resistors3 1 2 to 1 6 2...

Page 36: ...libration steps for present range VIEW DATES View calibration dates SAVE Save calibration constants LOCK Lock out calibration CHANGE PASSWORD Change calibration password Press ENTER to select a MENU i...

Page 37: ...ANGE PASSWORD 2 Select UNLOCK then press ENTER The instrument will display the following PASSWORD Use ENTER or EXIT 3 Use the EDIT and keys to select the letter or number and use the EDIT and arrow ke...

Page 38: ...Changing the password by remote To change the calibration password by remote first send the present password and then send the new password For example the following command sequence changes the passw...

Page 39: ...r errors after each calibration step minimizing the possibility that improper calibration may occur due to operator error Front panel error reporting If an error is detected during calibration the ins...

Page 40: ...o perform calibration Figure 2 1 Testhead connections TRIGGER LINK PULSE SYNC OUT TESTHEAD CONN 1 LINE FUSE SLOWBLOW 1 6A 250V LINE RATING 100 240VAC 50 60Hz 140VA MAX TESTHEAD CONN 2 CAT I WARNING NO...

Page 41: ...ress ENTER to complete the process 5 Press EXIT to return to normal display Step 2 Voltage measurement calibration Follow the steps below to calibrate both voltage measurement ranges Table 2 4 summari...

Page 42: ...teps 2 through 9 for the 5V range Be sure to set the calibrator output to 5 000V as shown in Table 2 4 Figure 2 2 Voltage measurement calibration connections CURRENT OUTPUT VOLTAGE SENSE CAT I DETECTO...

Page 43: ...2 3 8 Press ENTER to complete calibration of the present range 9 Press EXIT to return to normal display 10 Press LASER IL then EDIT then use the RANGE key to select the 5A current range 11 Press LASE...

Page 44: ...ENTER to enter the calibration menu 6 Select PULS_LOW then press ENTER The unit displays Pulse Low CAL Press ENTER to Output 15 000mA 7 Press ENTER The unit displays DMM RDG 15 000mA Use ENTER or EXIT...

Page 45: ...resistance value I V R 18 Adjust the display to agree with the calculated then press ENTER 19 Press EXIT to return to normal display 20 Disconnect the 100 resistor and connect the 10 resistor in its p...

Page 46: ...as 1 CAL Press ENTER to Output 20 000 V 7 Press ENTER The instrument will display the following message DMM RDG 20 00000 V Use ENTER or EXIT 8 Note the DMM voltage reading then use the EDIT keys to ad...

Page 47: ...then use the EDIT keys to adjust the Model 2520 display value to agree with the reading and press ENTER 15 Press EXIT to return to normal display 16 Repeat steps 4 through 15 for the DETECTOR 2 bias v...

Page 48: ...y press the Model 2520 DETECTOR 1 IPD key then select the 10mA current range using the RANGE key 4 Press the MENU key select CAL then press ENTER 5 Select EXECUTE then press ENTER to enter the CAL EXE...

Page 49: ...he Model 2520 display value to agree with the DMM reading then press ENTER 16 Press EXIT to return to normal display 17 Repeat steps 3 through 16 for the 20mA 50mA and 100mA ranges using Table 2 7 as...

Page 50: ...ut 10 500V 9 Press ENTER The instrument will display DMM RDG 10 500 V Use ENTER or EXIT 10 Note the DMM reading then adjust the Model 2520 display to agree with that value 11 Press ENTER The instrumen...

Page 51: ...ENTER key Press ENTER again to confirm the date 3 The unit will then prompt for the calibration due date NEXT CAL 08 15 2002 Use ENTER or EXIT 4 Set the calibration due date to the desired value and...

Page 52: ...URce2 NRf SOURce3 NRf DATE yyyy mm dd NDUE yyyy mm dd SAVE LOCK DIAGnostic KEIThley FCON HI b LO b Calibration subsystem Calibration commands protected by password Unlock calibration Default password...

Page 53: ...shielded interface cable 2 Turn on the Model 2520 and the test equipment and allow them to warm up for a minimum of one hour before performing calibration 3 If you are using the IEEE 488 interface mak...

Page 54: ...L POS CAL PROT SENS1 0 DIAG KEIT FCON LO OFF 5 Connect the calibrator to the Model 2520 testhead VOLTAGE SENSE jacks as shown in Figure 2 2 6 Set the calibrator voltage output to 10 000V and turn on i...

Page 55: ...HI OFF DIAG KEIT FCON LO ON SENS1 VOLT POL NEG CAL PROT SENS1 5 DIAG KEIT FCON LO OFF 10V 0 10 0000V 10 0000V SOURI FUNC SHAP DC SENS1 VOLT RANG 10 DIAG KEIT FCON HI ON DIAG KEIT FCON LO ON SENS1 VOL...

Page 56: ...it does not affect the measurement DIAG KEIT BITS VDAC1 4095 8 Source 10 of full scale SOUR1 CURR 0 05 9 Trigger a pulse INIT 10 Send the following query to request the Model 2520 voltage measurement...

Page 57: ...INIT SENS1 DATA CAL PROT SOUR1 Calculated_Current 3 OUTP1 OFF 5A 1 2 to 1 6 SOUR1 PULS TRAN STAT ON OFF2 SENS1 VOLT RANG 10 SOUR1 CURR RANG 5 OUTP1 ON DIAG KEIT BITS VDAC1 4095 SOUR1 CURR 0 5 INIT SE...

Page 58: ...e unit into the pulse mode SOUR1 FUNC SHAP PULS 4 Send this command to turn on the source output OUTP1 ON 5 Enable fast transition pulses SOUR1 PULS TRAN STAT OFF 6 Send the following command to selec...

Page 59: ...50 A respectively as the offsets when calculating the CAL PROT SOUR1 LOW parameter Table 2 11 Remote pulse low calibration summary Current range Calibration resistance1 Calibration commands N A SOUR1...

Page 60: ...rameter for the following command CAL PROT SOUR2 DMM_Reading 7 Send the following command to output 0V SOUR2 VOLT 0 8 Note and record the DMM reading and then send the negative of that value as the pa...

Page 61: ...s are negative of the displayed DMM reading Model 2520 Pulsed Laser Diode Test System Service Manual Calibration 2 31 Step 6 Current measurement calibration Follow these steps to calibrate current mea...

Page 62: ...range current point CAL PROT SENS2 Calculated_current 16 Send the following command to output 20V SOUR1 VOLT 20 17 Note the DMM voltage reading then calculate the current from the characterized resist...

Page 63: ...NS2 Current SOUR2 VOLT 20 CAL PROT SENS2 Current 20mA 1k 20mA 0mA 0mA 20mA SENS2 CURR RANG 20e 3 SOUR1 FUNC SHAP DC SENSE2 CURR POL POS SOUR2 VOLT 20 CAL PROT SENS2 Current SOUR2 VOLT 0 CAL PROT SENS2...

Page 64: ...VOLT 20 CAL PROT SENS3 Current SOUR3 VOLT 0 CAL PROT SENS3 Current SENSE3 CURR POL NEG CAL PROT SENS3 Current SOUR3 VOLT 20 CAL PROT SENS3 Current 20mA 1k 20mA 0mA 0mA 20mA SENS3 CURR RANG 20e 3 SOUR1...

Page 65: ...nt 100mA 200 100mA 0mA 0mA 100mA SENS3 CURR RANG 100e 3 SOUR1 FUNC SHAP DC SENSE3 CURR POL POS SOUR3 VOLT 20 CAL PROT SENS3 Current SOUR3 VOLT 0 CAL PROT SENS3 Current SENSE3 CURR POL NEG CAL PROT SEN...

Page 66: ...ading then send the value as the parameter for the following command CAL PROT SOUR1 PROT DMM_Reading For example if the voltage is 10 45V the correct command is CAL PROT SOUR1 PROT 10 45 8 Set the vol...

Page 67: ...xt calibration due date Note that the year month and date must be separated by commas Step 9 Save calibration constants Calibration is now complete You can store the calibration constants in EEROM by...

Page 68: ...2 38 Calibration Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 69: ...3 RoutineMaintenance...

Page 70: ...before replacing the line fuse The power line fuse is accessible from the rear panel and is integral with the AC power module see Figure 3 1 Figure 3 1 Model 2520 rear panel Line Fuse TRIGGER LINK PUL...

Page 71: ...the fuse with the type specified in Table 3 1 CAUTION To prevent instrument damage use only the fuse rating and type spec ified in Table 3 1 3 Re install the fuse carrier pushing it in firmly until i...

Page 72: ...3 4 Routine Maintenance Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 73: ...4 Troubleshooting...

Page 74: ...uire specialized equipment and skills for repair If you are not equipped and or qualified it is strongly recommended that you send the unit back to the factory for repairs or limit repairs to the PC b...

Page 75: ...NU 3 Select DISPLAY TESTS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select KEYS and press ENTER to start the test When a key is pressed the label...

Page 76: ...of the menu structure CHAR SET test The character set test lets you display all characters Perform the following steps to run the character set test 1 Display the MAIN MENU by pressing the MENU key 2...

Page 77: ...vided into two general areas Analog circuits includes measurement circuits for voltage and I V converter for current A D converters and voltage bias and current source circuits Digital circuits includ...

Page 78: ...Voltage Source Detector 1 20V 100mA Max I V Converter Detector 1 4 Current Ranges DETECTOR 1 I V Converter Detector 2 4 Current Ranges Voltage Source Detector 2 20V 100mA Max A D MC68332 Microprocess...

Page 79: ...nput signal currents to voltages that can be used by the A D converters U7 U8 Q10 and Q11 form a compound op amp for detector 1 I V conversion while U10 U17 Q15 and Q16 make up an identical op amp for...

Page 80: ...MPU DAC U2 Amplifier and Current Drive U3 DETECTOR 2 Bias Terminal Detector 2 Voltage Bias Source Control Data From MPU A D Converter U31 Buffer and Ranging U12 U13 PULSED SENSE Terminals Laser Diode...

Page 81: ...n output a maximum current of 1A DC 10V 10W or 5A 9V 45W current pulses DC and pulse high current source data from the MPU is converted into an analog signal by a 16 bit DAC made up of U54 and associa...

Page 82: ...nd unregu lated supply voltages Unregulated circuits include the 8VF1 supply and 25VF1 supply that powers the output stage Regulated circuits include 5VFA 12VF 12VD and 25VF supplies to power the vari...

Page 83: ...vides interfacing for the Digital I O port while U46 and Q6 Q11 provide Trigger Link I O interfacing Digital signal processor U47 is the DSP IC that processes raw voltage and current samples into fina...

Page 84: ...From A D Converters To Current and Voltage Source Control DACs ROM U3 U4 RAM U2 U17 Reset E PROM U13 2 DSP U47 Microprocessor U15 Serial Interface U20 GPIB U5 U6 U19 RS 232 Interface IEEE 488 Interfa...

Page 85: ...able 4 1 See Principles of operation on page 4 4 for display circuit theory Table 4 1 Display board checks Step Item component Required condition Remarks 1 2 3 4 5 6 Front panel test J1033 U902 pin 1...

Page 86: ...10 11 12 Line fuse Line power TP1 TP2 TP14 TP15 TP16 TP20 TP21 TP22 TP23 TP32 Check continuity Plugged into live receptacle power on 25V 10 25V 10 25V 5 12V 5 5V 5 5V 5 5V 5 12V 5 12V 5 3 3V 5 Remove...

Page 87: ...U5 pin 25 U15 pin 43 U15 pin 44 U15 pin 45 U15 pin 47 RAM OK ROM OK Digital common 5V Low on power up then goes high Check for stuck bits Check for stuck bits 16 78MHz Pulse train during RS 232 I O P...

Page 88: ...ply 20mA 2 5V 2 5V Apply 20mA 2 5V 2 5V Apply 10V Select 10V range 2 5V 2 5V Set to 20V 20V Set to 20V 20V 500mA range 500mA output 10V 1 4V Select detector 1 20mA range Detector 1 I V converter high...

Page 89: ...connect the line cord and all other test leads and cables from the instrument 2 Remove the case cover as outlined in Case cover removal on page 5 4 3 Locate the firmware ROMs U3 and U4 located on the...

Page 90: ...4 18 Troubleshooting Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 91: ...5 Disassembly...

Page 92: ...n handling PC boards Wear cotton gloves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adjacent to electrical...

Page 93: ...p these devices in their original containers until ready for installation Remove the devices from their protective containers only at a properly grounded work station Also ground yourself with a suita...

Page 94: ...re to mount the right ear to the right side of the chassis and the left ear to the left side of the chassis Each ear is marked RIGHT or LEFT on its inside surface 3 Remove rear bezel To remove the rea...

Page 95: ...en all the fasteners once they are all in place and the board is correctly aligned Be sure to plug in all cables Front panel disassembly Use the following procedure to remove the display board and or...

Page 96: ...panel power module 1 Disconnect the power module s ground wire This green and yellow wire connects to a threaded stud on the chassis with a kep nut 2 Squeeze the latches on either side of the power mo...

Page 97: ...n cable from J4 4 Remove the three screws that secure the output board to the standoffs 5 Pull the output board forward until the KEY INTERLOCK and REMOTE INTER LOCK connector clear the rear panel the...

Page 98: ...5 8 Disassembly Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 99: ...6 ReplaceableParts...

Page 100: ...hley representative or the factory see inside front cover for addresses When order ing parts be sure to include the following information Instrument model number Model 2520 Instrument serial number Pa...

Page 101: ...C177 C184 CAP 1UF 20 50V CERAMIC C 418 1 C148 C153 CAP 1000P 10 100V CERAMIC C 451 1000P C158 CAP 100U 20 16V ALUM ELEC C 547 100 C16 C46 C49 C101 C102 C104 C138 C139 CAP 100PF 5 100V CERAMIC C 465 1...

Page 102: ...4 C59 C312 C320 CAP 1UF 20 50V CERAMIC C 418 1 C33 C35 C36 C57 C58 C61 C62 C71 C75 CAP 47U 20 50V ALUM C 579 47 C34 CAP 470U 20 50V ALUM ELEC C 570 470 C39 CAP 47PF 10 100V CERAMIC C 451 47P C4 C9 C24...

Page 103: ...6 L18 L20 L21 FERRITE BEAD CH 91 L2 L4 L15 L19 L22 L28 L30 L32 FERRITE CHIP 600 OHM BLM32A07 CH 62 L29 INDUCTOR CH 105 1 L31 INDUCTOR CH 89 1 L33 L34 L36 L39 L42 L44 L47 L52 L55 L57 FERRITE CHIP 600 O...

Page 104: ...35 RES 2K 1 100MW THICK FILM R 418 2K R189 R192 R195 R196 RES 5 11K 1 100MW THICK FILM R 418 5 11K R216 R217 R230 RES 715 1 100MW THIN FILM R 438 715 R23 R26 R28 RES 100 1 1 4W METAL FILM R 391 100 R2...

Page 105: ...332 FC LSI 161 U16 IC 2 INPUT EXCLUSIVE OR GATE NC7SZ86 IC 1180 U19 IC OCTAL INTER BUS TRANS 75161 IC 647 U2 U17 IC 256K X 16 BIT CMOS RAM 17NS LSI 249 1 U20 IC 5V RS 232 TRANSCEIVER MAX202 IC 952 U21...

Page 106: ...16 BIT MULTIPLYING DAC IC 1359 U55 IC DUAL FET OP AMP IC 1128 U58 IC 8 STAGE SHIFT C074HC409AM IC 1026 U59 IC HEX INVERTER IC 1367 U6 IC OCTAL INTERFACE BUS 75160 IC 646 U60 IC HIGH PRECISION 10V REF...

Page 107: ...1032 CONN BERG CS 339 J1033 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 Q901 Q902 TRANS NPN GEN PURPOSE BC868 TG 293 R901 RES NET 15K 2 1 875W TF 219 15K R902 RES 13K 5 125MW METAL FILM R 375 13K R903 R...

Page 108: ...C42 CAP 100P 10 100V CERAMIC C 451 100P C254 C255 CAP 33PF 10 100V CERAMIC C 451 33P C257 C259 CAP 1UF 20 50V CERAMIC C 237 1 C26 C43 CAP 47PF 10 100V CERAMIC C 451 47P C28 CAP 1UF 20 50V CERAMIC C 41...

Page 109: ...66 RES 15 1 1W THICK FILM R 418 15 R100 RES 715 1 100MW THICK FILM R 418 715 R102 R104 RES 402 1 100MW THICK FILM R 418 402 R11 R7 RES 121K 1 100MW THICK FILM R 418 121K R14 R45 RES 1 1 100MW THICK FI...

Page 110: ...97 R98 R99 RES 100 1 100MW THICK FILM R 418 100 TP1 TP2 TP10 TP12 TP20 TP23 SURFACE MOUNT PCB TEST POINT CS 1026 TP6 TP25 TP27 CONN TESTPOINT CS 985 U1 U2 IC 5V 12 BIT DAC IC 1329 U10 U12 U13 U8 IC HI...

Page 111: ...IC C 465 47P C41 CAP 470U 20 25V ALUM ELEC C 478 470 C42 CAP 2200P 1 50V CERAMIC C 532 2200P C46 CAP 1UF 20 50V CERAMIC C 418 1 C5 CAP 10PF 5 50V MONO CERAMIC C 452 10P CR1 SCHOTTKY DIODE RF 121 CR2 C...

Page 112: ...3 RES 2 2 5 1W THICK FILM R 500 2 2 R3 R6 R7 R17 R19 R48 R67 R68 RES 1K 1 100MW THICK FILM R 418 1K R33 R35 RES 33 5 250MW METAL FILM R 376 33 R34 R36 R32 RES 33 5 250MW METAL FILM R 376 33 R37 R40 R3...

Page 113: ...TAGE SHIFT C074HC409AM IC 1026 U11 IC POS VOLTAGE REG 15V 500MA 78M15 IC 194 U12 IC 5V VOLTAGE REGULATOR LM2940CT IC 576 U13 IC HCPL0631 PACK IC 1153 U14 U25 IC 5V VOLTAGE REGULATOR IC 184 U15 U19 IC...

Page 114: ...2 CONNECTOR HOUSING CS 638 3 1 CONNECTOR HOUSING CS 638 3 1 COVER 2306 307A 1 COVER TOP 2520 324A 1 COVER BOTTOM 2520 326C 1 DISPLAY ASSEMBLY P 2400 110D 1 DISPLAY LENS 2520 311A 2 FOOT 428 319A 1 FOO...

Page 115: ...ystem Service Manual Replaceable Parts 6 17 1 REAR PANEL 2520 303A 1 SAFETY COVER MODIFIED 2520 330A 1 SWITCH SW 513A 1 SWITCH SW 513A 2 TRIAX CABLE CA 289 1A Table 6 5 continued Miscellaneous parts l...

Page 116: ...6 18 Replaceable Parts Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 117: ...A Specifications...

Page 118: ...00 mA 0 7 A 10 0 3 20 A 90 nA 20 00 mA 1 4 A 6 0 3 65 A 180 nA 50 00 mA 3 4 A 3 0 3 90 A 420 nA 100 00 mA 6 8 A 2 5 0 3 175 A 840 nA TEMPERATURE COEFFICIENT 0 18 C 28 50 C r 0 15 x accuracy specificat...

Page 119: ...ul resolution is improved by reading averaging The useful resolution is Setting Filter Averaging 100ns 400ns ns Width Pulse 1 2 Range Resolution Useful 14 15 Excluding total programmed Pulse ON time P...

Page 120: ...u can compute the limits from one year current measurement accu racy specifications as follows Accuracy of reading offset 0 3 10mA 65 A 30 A 65 A 95 A Thus the reading limits are 10mA 95 A or from 9 9...

Page 121: ...B CalibrationReference...

Page 122: ...tion code password Calibrate active voltage measurement range Query voltage measurement calibration constants Calibrate active detector 1 current measurement range Query detector 1 current measurement...

Page 123: ...ore sending any other calibration command The default remote password is KI002520 Note The CODE command should be sent only once before performing calibration Do not send CODE before each calibration...

Page 124: ...CAL PROT LOCK Lock out calibration SAVE CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Description The SAVE command stor...

Page 125: ...t panel CAL menu Note The year month and day parameters must be delimited by commas Example CAL PROT DATE 2001 8 20 Send cal date 8 20 2001 NDUE CALibration PROTected NDUE Purpose To send the next cal...

Page 126: ...ment range respectively During the calibration process each command is sent three times for each range once each with parameters of positive full range 0 and negative full range The appropriate calib...

Page 127: ...current source calibration constants Query cal prot sour1 data Description The CAL PROT SOUR1 DATA query requests current source cali bration constants Returned constants are in ASCII format separate...

Page 128: ...mple CAL PROT SOUR1 LOW Calibrate low output level DAC Voltage bias source commands SOURce CALibration PROTected SOURce2 CALibration PROTected SOURce3 Purpose To calibrate the detector 1 or detector 2...

Page 129: ...ring any calibration step the Model 2520 will generate an appropriate error message Several methods to detect calibration errors are discussed below Reading the error queue As with other Model 2520 er...

Page 130: ...ned above to check for errors and to determine the exact nature of the error Detecting calibration step completion When sending remote calibration commands you must wait until the instrument com plete...

Page 131: ...calibration command 3 After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use STB to request the status byte 4 Once operation comple...

Page 132: ...B 12 Calibration Reference Model 2520 Pulsed Laser Diode Test System Service Manual...

Page 133: ...rror summary B 9 Generating an SRQ on error B 10 Reading the error queue B 9 Status byte EAV Error Available bit B 10 Detecting calibration step completion B 10 Generating an SRQ on calibration comple...

Page 134: ...module removal 5 6 Power supply module removal 5 6 Repair considerations 4 2 Resetting the calibration password 2 8 Restoring factory defaults 1 6 Routine Maintenance 3 1 S Safety considerations 4 2 S...

Page 135: ...Unstable Overload Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement inc...

Page 136: ......

Page 137: ...d Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com 12 04 Specifications are subject to change without notice All Keithley trademarks and trade names are the...

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