Keithley 263 Instruction Manual Download Page 154

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Summary of Contents for 263

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Page 2: ...ot 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...

Page 4: ...quentially 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 new Revi sion includes a revised cop...

Page 5: ...sent A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Users of this product must be protected from electric shock at all times The responsi...

Page 6: ...efore performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the warranty Instrumentation and accessories shall...

Page 7: ...263Calibrator Source...

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Page 9: ...l 2 l 2 3 2 4 2 5 2 5 2 5 SECTION 3 Operation 3 1 3 2 3 2 1 3 2 2 3 2 3 3 2 4 3 2 5 3 2 6 3 3 3 3 1 3 3 2 3 3 3 3 4 3 4 1 3 4 2 3 5 3 5 1 3 5 2 3 6 3 6 1 3 6 2 3 7 3 7 1 3 7 2 3 7 3 INTRODUCTION I OWE...

Page 10: ...l Contro led Systems Cable Connecttons PRlMARYADDRESSPROGRAMMING CONTROLLERPROGRAMMING Controller Handler Software Interface BASIC Programming Statements FRONT PANEL ASPECTS OF IEEE 488 OPERATION BusE...

Page 11: ...ETERS 5 14 Model 480 Picoammeter Calibration 5 14 Model 619 Electrometer Calibration 5 14 Model 614 Electrometer Calibration 5 15 Model 642 Electrometer Calibration 5 16 Model 610C Electrometer Calibr...

Page 12: ...vironmental Conditions Cool down Period Calibration Switch Calibration Record Front Panel Calibration IEEE 488 Bus Calibration Program SPECIAL HANDLING OF STATIC SENSITIVE DEVICES DISASSEMBLY INSTRUCT...

Page 13: ...Character Codes and IEEE 488 Multiline Interface Command Messages C l APPENDIX D IBM PC AT and CEC PC 4R8 Interface Programming D l APPENDIX E Controller Frograms E l APPENDIX F IEEE 488 Bus Overview...

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Page 15: ...mmands and Associated BASIC Statements 4 6 4 s Device Dependent Command Summary 4 10 SECTION 5 Applications 5 l Model 485 Range Calibration 5 2 5 2 Model 617 Amps Calibration 5 8 5 3 Model 617 Volts C...

Page 16: ...ration 8 8 8 9 Cold High Ohms Calibration Direct Measurement Method 8 9 a 10 Hot High Ohms Calibration Direct Measurement Method 8 9 8 11 Recommended Troubleshooting Equipment 8 15 8 12 rowersupplyche...

Page 17: ...3 14 Sourcing Amps to a Feedback Picoammeter 3 17 3 15 Sourcing Guarded Amps to a Shunt Picoammeter Using an Input Adapter 3 17 3 16 GuardingforHighImpedanceLoad 3 18 3 17 UsingI REAMI OUTGuard 3 l 8...

Page 18: ...e Model 263 5 22 5 17 Diodecharacterization 5 22 5 18 DiodeCurves 5 22 SECTION 6 Performance Verification 6 l VOLTSAccuracyChecks 6 2 6 2 AMPSZeroOffsetChecks _ _ _ _ __ _ __ _ _ _ _ 6 5 63 AMPS ZOOPA...

Page 19: ...96 DMM or equivalent is the only instrument needed 1 3 WARRANTY INFORMATION Warranty information for your Model 263 may be found inside the front cover of this manual Should it become necessary for yo...

Page 20: ...these accessories Models 1019A 1 and 1019A 2 are fixed shelf type rack mounting kits for half rack 127mm Wz in high instru ments such as the Model 263 The 1019A 1 kit mounts one instrument and the 101...

Page 21: ...o make guarded connections from the Model 263 to the Model 619 Electrometer Triax female to triax male Models 7007 l and 7007 2are shielded IEEE 488interface cables with shielded connectors on each en...

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Page 23: ...Outlines each aspect of the Model 263 rear panel including connectors and switches 2 4 Basic Sourcing Techniques Provides a general step by step procedure for sourcing resistance voltage current and c...

Page 24: ...Configures the Model 263 as an active coulomb source that can output zero to 199 995 SHIFT COUL Configures the Model 263 as a passive coulomb source COUL V R that can output zero to 199 995 K CONTROL...

Page 25: ...re KEYPAD was enabled Toggles the display between positive polarity and negative polarity ZERO This button toggles the display between zero and the reading that was previously displayed SHIFT GUARD To...

Page 26: ...LIBRATION Switch Permanent calibration of the Model 263can only be done if the CALIBRATION switch is in the ENABLED position IEEE CONNECTOR This connector is used to connect the instrument to the IEEE...

Page 27: ...tput of the Model 263 to the input of the Model 617 Elec trometer using the supplied triax cable 2 4 3 Basic Sourcing Procedure Configure the Model 617 Electrometer to make un guarded resistance volta...

Page 28: ...to Figure Z 4 1 Enable Keypad Pressthe KEYPAD ENTER button to enable the keypad The keypad indicator light will turn OIL 2 Key In Reading With the cursor positioned at the most significant digit key...

Page 29: ...ctrometer tion of the passive V R source again press the OPERATE button The instrument will go 2 If an external source is connected to the EXTINPUT and to standby asindicated by the STANDBY indicator...

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Page 31: ...rate and Zero Provides details for using these two front panel controls Guard Describes how to use the Model 263 in the guarded output configuration Preamp Out Explains some of the uses for the preamp...

Page 32: ...k on and off See paragraph 8 7 for a complete description of the power up self test and recommenda tions to resolve problems 3 2 5 Power Up Configuration Upon power up the Model 263 will assume specif...

Page 33: ...This is particular ly handy when running automated test programs over the IEEE 488 bus Since internal VOLTS only outputs up to k19 9995 and 19 9995mA an external source can be used to calibrate instr...

Page 34: ...hen the instrument was calibrated In effect the instru ment knows what the output resistance is at all operat ing temperatures This temperature compensation feature can be disabled by front panel Prog...

Page 35: ...the load resistance is less than 12V I x R 12V Notes 1 Voltage limit will never occur when sourcing to a feed back ammeter since the burden voltage of this device is so low The burden voltage typical...

Page 36: ...tton The red VOLTS indicator will turn on EXT INPUT To select EXT INPUT first press SHIFT and then press VOLTS The yellow EXT indicator will turn on AMT To selectthe active current function press AMPS...

Page 37: ...your preference but when making minor changes to the displayed reading the Adjust method is probably faster Keypad entry is the best choice when an entirely new reading is going to be entered 3 5 1 Ad...

Page 38: ...the following procedure to enter a reading on the display Enable the keypad by pressing KEYPAD ENTER The KEYPAD light will turn on and a segment of the most significant digit will flash to indicate t...

Page 39: ...ZERO button toggles the display between the existing reading and zero This provides an easy method to source zero in order to cancel offsets and test lead resistance The output must be set to OPERATE...

Page 40: ...to be connected to the in ner shield of the cable With the voltage potential on out put high and the inner shield the same no leakage cur rent can flow The leakage from the guarded inner shield to low...

Page 41: ...ield With this capability connecting the Model 263to the electrometer is a simple matter as shown in Figure 3 11 For electrometers whose input cannot be reconfigured an input adapter will be re quired...

Page 42: ...UARDED Figure 3 10 Ohms Output Configurations MODEL 263 _____________ I OUTPUT t MODEL 617 ELECTROMETER I I I GUARD I I I I I I I I I I I I I I _ _ Figure 3 11 Sourcing Guarded Ohms to Electrometer th...

Page 43: ...I p i KS r v 4 INPUT a 5 iF _ ___ I I UNGUARDED GUARDED I L_ __ __ _ ___ __I MODEL 619 ELECTROMETER MODEL 6191 ADAPTER u3 BANANA CABL I _ ______ J MODEL 263 BANANA CABLE GUARD ENABLED Figure 3 12 Sour...

Page 44: ...0C 614 616 617 619 Selectable Guarded Required Input Input Available Adapters Keithley Model No Yes None NO 4804 CS 115 NO 6167 Yes None Yl S None NO 6 i Guarded Ohms Measurement Range All All 100Mn A...

Page 45: ...Models 6191and 6167Input Adapters can be used with the Model 602 Figure 3 15 shows how the Model 263 is connected to a shunt picoammeter Model 602 set for NORMAL amps using an input adapter Model 6191...

Page 46: ...OPERATION PREAMP OUT HI 263 CURRENT SOURCE A UNGUARDED GUARD I PREAMP OUT HI 263 CURRENT SOURCE 37 B GUARDED Figure 3 13 Amps Coulombs Output Configurations 3 16...

Page 47: ...MP I OUTPUT i INPUT GUARD DISABLED Figure 3 14 Sourcing Amps to a Feedback Picoammeter SHUNT PICOAMMETER __ __ _______ MODELS 602 __ ____ I t I I I MODEL 263 BANANA CABLE GUARD ENABLED Figure 3 15 Sou...

Page 48: ...I No CONNECTlONS I I I I GUARD ENABLED _____ _ _ _ _ _ _____________1 Figure 3 16 Guarding for High Impedance Load MODEL 263 _ ___ _____ ___ _____I I OUTPUT I I I I I I I I I I I __ ______ ____ GUARD...

Page 49: ...nitored Figure 3 18 at the load 3 8 PREAMP OUT PREAMP OUT can also be used as an external guard source when sourcing current or charge See paragraph When sourcing current or charge the PREAMP OUT and...

Page 50: ...ollowing steps to use this program 1 Press the MENU button until the current primary ad dress of the interface is displayed For example if the primary address is 8 the following message will be displa...

Page 51: ...ther pro grams programming temperature compensation for 0 off will not be remembered on the next power up On power up temperature compensation will always be enabled 1 3 10 SOURCING TECHNIQUES Using t...

Page 52: ...equired to keep the electrometer on the optimum range 1 With the Model 263in standby connect the source to the electrometer Generally unguarded connections can be used when sourcing 5 lOOM For unguard...

Page 53: ...Perform the following procedure to use the voltage source 1 With the Model 263in STANDBY connect the source to an electrometer to be calibrated or to a load Guard ed connections are not necessary when...

Page 54: ...or as a passive source AMPS V R or COUL V R The difference between the active and passive V R source is explained in paragraph 3 3 1 Perform the following procedure to source amps to a picoammeter or...

Page 55: ...D Press OPERATE on the Model 263 to place it in standby E Press ZERO on the Model 263 to display the pro grammed current setting 6 When ready to output the displayed current or charge press OPERATE If...

Page 56: ...g current or charge voltage changes appropriately as the resistance changes in order to maintain the output at the ro gr ed current charge setting For example on the A or 2nC range the lGI7 resistor i...

Page 57: ...gh the insulator represented by Q and burden voltage is less than lOO V the basic accuracy C separating source Hl from source LO Whether or not specification is not degraded this leakage current cause...

Page 58: ...gure 3 26 shows the general technique to guard the source Source low is rerouted to the outer shield of the cable and a guard potential V is connected to the inner shield The guard voltage is at the s...

Page 59: ...OPERATION Figure 3 26 Guarded Triax Cable 3 2913 30...

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Page 61: ...us 4 2 1 Typical Controlled Systems System configurations are asvaried as their applications Toobtain asmuch versatility as possible the IEEE 488bus was designed sothat additional instrumentation coul...

Page 62: ...or metric assignments for the various bus lines whiie Figure 4 5 shows contact assignments Figure 4 2 IEEE 488 Connector A typical connecting schemefor the bus is shown in Figure 4 3 Each cable normal...

Page 63: ...4 Model 263 Rear Panel IEEE 488 Connector Figure 4 5 Contact Assignments 4 3 PRIMARY ADDRESS PROGRAMMING The Model 263 must receive a listen command before it will respond to addressed commands Simila...

Page 64: ...4 4 1 Controller Handler Software Before a specific controller can be used over the IEEE 488 bus it must have IEEE 488 handler software installed With some controllers the software is located in ROM a...

Page 65: ...remote or if an illegal device dependent command IDDC or illegal device dependent cornmand option IDDCO is sent to the instrument Under these conditions the complete corn mand string will be rejected...

Page 66: ...h exponent decimal points i e V indicate that the A command was sent NOTE Blinking exponent decimal point s are also used to indicate an NVRAM failure NVRAM is tested on power up and when the device i...

Page 67: ...will turn off indicating that the instrument has gone into the talker idle state 4 6 3 LLO Local Lockout The LLO command is used to remove the instrument from the local operating mode After the unit...

Page 68: ...up default conditions 4 6 7 SPE SPD Serial Polling The serial polling sequence is used to obtain the Model 263 serial poll byte The serial poll byte contains irnpor tant information about internal fun...

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Page 70: ...ion at the time the X character is received If any errors occur the instrument will display appropriate front panel error messagesand generate an SRQ if pro gmrnrned to do so Device dependent commands...

Page 71: ...be true when sending device dependent commands to the instrument or it will ignore the command and display a bus error message General HP 85 Programming Example Device dependent commands may be sent...

Page 72: ...IEEE 488 PROGRAMMING Table 4 5 Device Dependent Command Summary Cont Auto On Auto 4 11...

Page 73: ...ed to 5 Example Sending A1 902 54X will result in a display reading of 1 90255 3 If the LSD of the command value is 8 or 9 the display will round to 10 That is the LSD will be 0 and the next more sign...

Page 74: ...mmand is received temperature com pensation will enable Cl The instruments ability to measure the internal operating temperature makes it possible for it to track the actual resistance of the lGQ lOG0...

Page 75: ...up to 200V peak lOOmA peak can applied to EXT INPUT on the rear panel of the Model 263 The F5 command is used to connect the external source to the output of the Model 263 The calibration ladder F6 i...

Page 76: ...fix GO The prefix identifies the reading that is sent over the bus Figure 4 6 shows the for mat for these readings Program for no prefix Send reading to computer Display no prefix reading on CRT Progr...

Page 77: ...S JOPerform self tests Description Self Test When the JOcommand is sent over the bus the instrument performs the ROM test If the self test is successful the self test error bit in the Ul status word w...

Page 78: ...ositively identify the last byte in the data string sent by the instrument When enabled EOI will be asserted with the last byte the instrument sends over the bus PrOgraIlllllitlg 1 Some controllers re...

Page 79: ...resistors at the low cold temperature point The A calibration command is used to calibrate the high hot temperature point of the gigohm resistors seeparagraph 4 72 Programming 1 Only as many signific...

Page 80: ...by using the serial polling sequence as described in paragraph 4 6 7 is shown in Figure 4 7 Note that the various bits correspond to the bits in the SRQ mask as described above The bits in the serial...

Page 81: ...il the Ul word is read paragraph 4 7 12 The Ul status word will define the nature of the error 4 The serial poll byte should be read to clear the SRQ line once the instrument has generated an SRQ All...

Page 82: ...ilable at the output of the Model 263 In standby 00 the programmed source is removed from the output On all func tions except coulombs the lCOG0 resistor is placed on the output For the coulombs funct...

Page 83: ...Fl through Fll commands perform essentially the same functions as the front panel RANGE buttons An added feature available over the bus is autorange for the volts amps and coulombs functions When FOis...

Page 84: ...umeric values The values shown in the UO status word are the default values Ul The Ul command allows accessto Model 263error conditions The error status word Figure 4 9 is actually a string of ASCII c...

Page 85: ...4 20 v 2 tC 1OOGL 1 NoEOI 07 1Gi l 2 20 V 20 tC 1OOGL OS lOGil 20 A 20 V 2OOpC 1OOGL TERMINATOR ci 09 1OOGR 200 pA 20 V 200 C 1OOGL 0 CR LF 10 lOOGO 2 n b 20 V 2OOpC 1OOGL 1 LF CR 11 lOOGO 2OmA 20 V 2...

Page 86: ...main that way until the Ul word is read 3 The programmed terminator default CR LFJwill be transmitted at the end of each status word 4 EOI will be transmitted at the end of the status word unless disa...

Page 87: ...he command value is an 8 or 9 the display will round to 10 That is the LSD will be 0 and the next more significant di it will increment carry by one unit Example Sending V1 00258will result in a play...

Page 88: ...e W Description When guard is enabled Wl the output of the Model 263 is reconfigured so that a guard drive can be placed on the inner shell of the output triax connector Depend ing on the function the...

Page 89: ...ter later Programming 1 Command strings sent without the execute character will be stored within an Notes internal command buffer for later execution When the X character is finally transmitted the st...

Page 90: ...ator CR LF will be selected A terminator sequence can be programmed by sending the Y command followed by an appropriate character The default terminator sequence is the commonly us ed carriage return...

Page 91: ...s when ZO is sent the reading that was remembered will again be displayed and sourced if in operate Programming If Zl is sent twice or moxe consecutively while in the volts amps or coulombs func Note...

Page 92: ...lisecond For ex ample the command string FlZlOlX will typically take 7msec to transmit from the controller to the Model 263 The time it takes for the Model 263 to perform the tasks of the command stri...

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Page 94: ...ts contact your Keithley representative or the factory for futher information 5 1 2 Sourcing Applications Paragraph 5 5 contains several applications using the Model 263asa precision source Applicatio...

Page 95: ...put of the Model 485as shown in Figure 5 1 Make sure the calibrator is in standby 4 On the Model 485 press the REL and LOG push buttons simultaneously and hold in until the message CAL is displayed Re...

Page 96: ...ess the RUN key on the computer The program will prompt for the on ly manual adjustment and then automatically calibrate 5 The program will prompt for storage of the calibration constants line 330 Thi...

Page 97: ...WpiIT 2000 300 OUTPUT 722 U J 310 OUTPUT 722 i Z0X 320 NEXT I 263 output zero amps 485 enable REL to cancel offset 263 source programmed output K 485 send calibration value 485 disable REL 330 BEEP D...

Page 98: ...ary if calibration is to be performed over the IEEE 488 bus 6 HP 85 Computer equipped with HP 82937GPIB Inter face and I O ROM 7 Keithley Model 7008 IEEE cable Accuracy requirement of calibration equi...

Page 99: ...el digital calibration paragraph 5 3 6 or IEEE U Bus Digital Calibration para graph 5 3 7 A Input Offset Adjustment Perform the following steps to null out any small offset in the input amplifier 1 Di...

Page 100: ...rews removed earlier C Voltage Source Calibration Use the following procedure to calibrate the voltage source Since the voltage source is independent from the electrometer section voltage source calib...

Page 101: ...5 2 asaguide selectthe next electrometer range and calibrator range and repeat the basic pro cedure in steps 3 through 9 Calibrate all the elec trometer ranges listed in the table Table 5 2 Model 617...

Page 102: ...nnect the Model 263to the Model 617asshown in Figure 5 5 Note that Model 263COMMON must be connected to Model 617COMMON 2 Enable GUARD on the Model 263 and setthe Model 617guard switch to the ON posit...

Page 103: ...orage Once all points have been calibrated be displayed briefly press PROGRAM SELECTto exit the calibration program Assuming that the calibration jumper is in the enable posi Out tion paragraph 5 3 1...

Page 104: ...sable position paragraph 5 3 1 and calibration constants will be lost when the Model 617 is turned off display 10 CLEf R 727 708 CLEAR BEEP 20 DISP CONNECT THE 263 TO THE 617 FIG 5 5 fiNO THE EXT II S...

Page 105: ...A V Xu 617 send cal value 550 WAIT 2000 560 NEXT I 570 OUTPUT 727 Z0N0R4Xe 617 select Z00U range 580 OUTPUT 708 F5OlX 263 sput ce ext U to 617 590 WAIT 2000 600 BEEP 2 200 OUTPUT 727 YAl30X 617 send c...

Page 106: ...D2 z hm 200Mohm 0Mohm ZMohm 00kohm Okohm DO YOU WISH TO PERMANENTLY STORECAL CONSTANTS Y N 890 INPUT 95 900 CLEAR IF 95 Y THEN 940 910 OISP CAL CONSTANTS NOT STORED DISP 920 DISF ALTERED RANGES TEMPO...

Page 107: ...sourced to the meter by again pressing ZERO The above procedure only needs to be performed if the Referring to the calibration procedure found in the Model specified offset of the Model 263 is high en...

Page 108: ...The Model 263 must be in the guarded configuration and connected to the Model 619through the Model 6191 Guarded Input Adapter see Figure 5 8 4 Range Verification Use the Model 263to verify the ac cura...

Page 109: ...voltage source of the Model 263 to source 19o OOOmV 1 9OOOOV and lO OOMW to the Model 642 3 Current Calibration steps b e and g Use the passive V R current source of the Model 263 to source lOO OOOnA...

Page 110: ...y source all required current levels 3 Ohms step d The procedures in this paragraph require precision resistors to check accuracy In stead use the Model 263 to source the appropriate resistance When s...

Page 111: ...rent current sources to pro vide the required current levels Instead use the Model 263 to accurately source all required current levels 3 Resistance Accuracy Checks The procedures in this paragraph us...

Page 112: ...5mV to 1OOV to the electromter and adjusting the appropriate pots The VOLTS source of the Model 263will provide all but the 1OOV To source loOV connect aDC Calibrator such asthe Fluke Model 343A to EX...

Page 113: ...nd source a current level that is as close as possible to the unknown current 4 Vary the output of the Model 263current source until a null on the Model 617 is achieved 5 Gradually increase the sensit...

Page 114: ...onstant based on the geometry of the wafer and probe t sample thickness Certain semiconductor materials such as silicon have V measured voltage hieh resistivities The measurement of their resistivitv...

Page 115: ...APPLICATIONS AMPS SOURCE MODEL 617 VOLTMETER Figure 5 16 Resistivity Measurement Using the Model 263 AMPS SOURCE Figure 5 17 Diode Characterization Figure 6 16 Diode Curves 5 22...

Page 116: ...cedures If the instrument has been subject to extremes of temperature outside the ranges specified in paragraph 6 2 additional time should be allowed for internal temperatures to reach normal operatin...

Page 117: ...nput B If the display does not read oOO OOOOmV press the ZERO button to zero out the offset C Remove the short from the input NOTE If using a DMM that does not have zero correction capability record t...

Page 118: ...Using Table 6 3 perform the following steps to verify ac curacy of the lkQ range tion capability record the oftset and subtract it from the reading in step 6 to determine the zero offset of the Model...

Page 119: ...3 1 Set the Model 617to the 2pA range and with an open input allow the reading on the display to settle 2 On the Model 617 press the SUPPRESSbutton to zero the display Allowable reading 0 04 x PO PO N...

Page 120: ...OOOOpA PA lOOO to lOOO 200 pA OO OOOpA 2pA l200 to x200 2n4 oooooPA 2OpA 0 200 to 0 200 20 IL4 o oooonA 2OOpA 01 00 to 01 00 200 nA oo ooonA 2nA OlOO to OlOO 2 4 OOOOO PA 2onA 0 100 to 0 100 20 fiA 0...

Page 121: ...OA as shown in Figure 6 3 13 Set the 263 to the 200pA range the Model 196 to the 3V range and the Model 54SOA to output 10kn 14 Program the Model 263 to output OO OOOpA 15 On the Model 196 press the Z...

Page 122: ...on to source negative current 7 After allowing the reading to settle record the negative voltage reading in the table 8 Add the absolute values of the two readings and divide by two Record this averag...

Page 123: ...Vominal lOOM0 1OOMQ lOOMa 1OOMR 1OOMCl IOOMR 1OOMQ lOOMC2 1OMn I OMCl 1MQ 1MQ Allowable Calculated 196 Calculated Output Current Current Reading 196 Avg i 5450A Reading Current WC to 28 C 18 9383pA t...

Page 124: ...AMPS 2OpA 2pA Accuracy Checks 545lw Resistor NomilI l lOOM0 lOOM0 l JMll MOM0 lOOMQ IDOMCl lOOMa 103MQ lDMs2 KIM0 lMR lM0 l96 Reading Calculated Output Current 196 Avg t545OA Reading Curmt t 1 89882nA...

Page 125: ...CE VERIFICATION Table 6 7 AMPS V R Functional Checks 2OOpA 200 PA 19O OOOpA 190 000pA 186 95to 193 05 189 il to 190 29 617 Reading Reading limits determine by the accuracy specifications of the Model...

Page 126: ...e source ranging amplifier displaying data and com municating over the IEEE 488bus 7 3 VOLTAGE SOURCE Refer to the mother board schematic 263 106 sheet 2 for the following discussion on the voltage so...

Page 127: ...PRINCIPLES OF OPERATION Figure 7 1 Model 263 Simplified Diagram 7 2...

Page 128: ...ve polarity 46 and Q8 are on Components C36 C37 R39AND R41serve to stabilize the composite amplifier circuit Table 7 1 Voltage Source Ranges Range selection is accomplished by turning on the ap propri...

Page 129: ...PRINCIPLES OF OPEFlATION P ot 4 VDC 112vp A 1 2 DUTY CYCLE P j l lOT O1T I VDC l l 0 VP B 1 10 DUTY CYCLE Figure 7 3 Pulse Width Modulation 7 4...

Page 130: ...PRINCIPLES OF OPERATION in R34 vo 0 40KR CiS 1 ZuF 22 2kn 1 FL33 Figure 7 4 3 Pole Filter 7 5...

Page 131: ...PRINCIPLES OF OPERATION I 400kQ R36 VA x V RANGE I 1 0 047uF C3 I 44 44kn R37 mANGE 1 L n SW I I L II 2 i C33 b in 160kR R39 39 2kR 0 022pF Figure 7 5 Voltage Source Ranging Amplifier...

Page 132: ...ner shield LOW of the triax OUTPUT connector With GUARD enabled the resistance is removed from the inner shield and routed to the COMMON terminal This allows a driven guard to be connected to the inne...

Page 133: ...ctive current source is shown in Figure 7 9 This sourcing method is indepen dent of burden voltage In this configuration the voltage source floats on the output of the electrometer amplifier As with t...

Page 134: ...PRINCIPLES OF OPERATION Figure 7 8 Active AMPS Current Source Circuitry 7 9...

Page 135: ...res in order to determine their temperature coefficients TCs over the OT to 50 C operating temperature span The actual temperature measurement is performed by LJll which is a temperature to current co...

Page 136: ...dard IEEE 488 interface that allows the instrument to be programmed from a system controller Commands can be sent over the bus to the in strument and data can be requested from the instrument as well...

Page 137: ...agram for the main power power supply is located on drawing 263 106 sheet 2 AC power is applied to Jl which is the power connector located on the rear panel of the instrument Sl is the POWER switch lo...

Page 138: ...ower box indicates the higher voltage transformer is installed The position of the switch in dicates the selected line voltage To change the line voltage proceed as follows WARNING Disconnect the Mode...

Page 139: ...as the hot calibration By calibrating the Model 263at these two temperature points the actual temperature coefficients TC of the lGQ 1OGD and lOOGOresistors are determined and stored for use on these...

Page 140: ...recording data This allows the data to be erased so that the tables can be used again in the future 8 4 5 Calibration Switch A switch located on the rear panel seeFigure 8 Z allows the technician to d...

Page 141: ...t value is 189 877mV the calibration value will be 189 875mV If the LSD of the DMM reading is an eight or nine change it to a zero and increment the next highest digit by one unit For example if the o...

Page 142: ...splay of the Model 263 and then press the MENU button to calibrate and store the new value 8 PlaceModel 263in standby and disable the zero feature on the DMM 9 Using the appropriate low ohms calibrati...

Page 143: ...ve a zero fea ture record the settled offset reading This value will have to be algebraically subtracted from the reading in the next step to determine the actual voltage from the prearnp output 6 Pre...

Page 144: ...MM will be the offset voltage of the Model 263 5 Set the DMM to the 3V range and allow the reading to settle 6 Remove the top cover of the Model 263 and adjust R9 see Figure 8 5 for a reading of O OOO...

Page 145: ...263 Calibration V E JIlV _ V __ _ V Table 8 7 Hot Low Ohms Calibration DMM Range 3kO 30 kQ 300 kQ 3Mil DMM Pange 30 v 3OV 3v 3oomv 3v 3oomv Table 8 8 Hot High Ohms Calibration 63 Laddef Range l OOOOO...

Page 146: ...e is used to calibrate the 1OMRthrough 1OOGR ranges Table 8 10 Hot High Ohms Calibration Direct Measurement Method 263 263 Measured Resistance Range Guard Calibration Value I 10MR OFF 1OOMQ ON 1GO ON...

Page 147: ...Interface and an Ii0 ROM automatically perform digital calibration Lastly the pro gram will prompt for the only manual adjustment 1 Connect the Models 263 and 196to the GPIB interface required of the...

Page 148: ...MAINTENANCE s 11...

Page 149: ...MAINTENANCE CALIBRATION PROGRAM Cont...

Page 150: ...g it Also make sure the spring contact clips located on the rear panel make contact with the top cover shield 2 Remove the analog board as follows A B C Disconnect I 10 and I ll from the analog board...

Page 151: ...MAINTENANCE BOmOM SHIELD ANALOG BOARD AND COLLAR 6 DISPLAY BOARD RIBBON CABLE DISPLAY BOARD COVER w w MOTHER BOARD ASSEMBLY Figure 8 6 Model 263 Exploded View 8 14...

Page 152: ...lled before applying power to the instrument 8 7 TROUBLESHOOTING The troubleshooting information contained in this section is intended for qualified personnel having a basic under standing of analog a...

Page 153: ...riefly Al The instrument will now display a value terminated with a T This number represents temperature infor mation and should be between 25 000 and 45 000 A value outside of this range indicates a...

Page 154: ...which eluded arethe FETsthat are subsequently energized Logic can be in SRNDBY Table 8 13 Volts Logic and Switching States u9 IJIll Outputr oo ooomv 1 ooooov 1 o oooov 1 ov l v VOLTS EXT l 1 Ql Q8 1...

Page 155: ...0 0 0 l 1 0 Q12 Q13 200nA 200nC 11 0 0000 000100110 0 1 l 1 1 Q12 Q13 47 QS 2OOpA 20nA OQA 2nA 2pA 2oopc 20nC 2opc 2nc 11 11 11 1 1 0 1 0 0 0 0 1 0000 000001101 0 0000 000100100 0 0000 000001100 0 000...

Page 156: ...00 0 l l 0 0 0 0 l 0000 101 10001000 1 l l 1 0 0 0 l 0000 101 00100100 0 l l 0 0 0 0 l 0000 101 10000000 1 l l 1 0 0 0 l 0000 101 00100000 0 l l 0 0 0 0 l 0000 101 00000000 0 l l 0 0 0 0 l 1000 101 01...

Page 157: ...uired Condition I I 1 TF5 TEl8 P9 pin 14 1 oooov 2 Junction R34 R35 5v 3 Junction Rl2 Rl3 See Waveform 1 4 U5 pin 8 See Waveform 2 5 IJ5 pin 9 See Waveform 3 6 U20 pin 8 See Waveform 4 7 U34 pin 5 See...

Page 158: ...play Circuitry Checks Item Component U2 pin 9 LJl U2 pins 11 18 u5 pins 11 18 U6 oins 15 B u4 pins 10 15 l 8 pin 14 I 8 pin I5 I 8 pin 16 Required Condition 5v flO Waveform 9 Waveform 10 Remarks 5v su...

Page 159: ...carefully apply clean uncontami nated methanol to the area to be cleaned Use sufficient solution to thoroughly wet the circuit board 2 Using a small clean brush wipe the area thoroughly until it is f...

Page 160: ...MAINTENANCE WAVEFORM 4 8 23...

Page 161: ...MAINTENANCE 1 WWW msld iv 7 m v o W 0 mV WAVEFORM 5 WAVEFORM 6 8 24...

Page 162: ...MAINTENANCE WAVEFORM 0 8 25...

Page 163: ...MAINTENANCE WAVEFORM 10 8 26...

Page 164: ...MAINTENANCE WAVEFORM 12 8 2718 28...

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Page 166: ...NT 9 4 ORDERING INFORMATION 3 Part description 4 Circuit designation including schematic diagram and component layout numbers if applicable 5 Keithley part number 9 5 FACTORY SERVICE If the instrument...

Page 167: ......

Page 168: ...100 35V ELECTR0LYT1C CAP 10OpF 10 100OV CERAMIC CAP lOOOuF 10 100 35V ELECTROLYTIC CAP luF 20 5OV CERAMIC CAP 33pF lO lOOOV CER MIC CAP 2200pF 10 l000V CERAMIC CAP luF 20 5OV CERAMIC DIODE BRIDGE VM1...

Page 169: ...TAL FILM RES lK 5 1 4W COMPOSITION OR FILM RES 1OK 5 1 4W COMPOSITION OR FILM RES 5 1K 5 1 4W COMPOSITION OR FILM RES 9 09K 1 1 8W METAL FILM RES 511 1 1 8W METAL FILM RES 909 1 1 8W METAL FILM RES 49...

Page 170: ...QUAD COMP 399 IC OP AMP LT1052CN IC SINGLE DUAL LOW NOISE OP AMP 5534 IC 18V OP AMP LM308AW IC TRIPLE 3 INPUT NAND 74HClO IC 16X16 BIT SERIAL RAM X2443P IC VOLTAGE REGULATOR LM337MP IC DUAL LOGIC INT...

Page 171: ...REPLACEABLEPARTS Mother Board Component Location Drawing Dwg No 263 100 9 6...

Page 172: ...REPLACEABLE PARTS i Je Mother Board Schematic Diagram Dwg No 263 106 Page 1 of 2 9 719 s...

Page 173: ...n I 7 w...

Page 174: ...20 2OV TANTALUM DISPLAY DIGITAL PILOT LIGHT YEL LED DISPLAY DIGITAL DISPLAY DIGITAL DOUBLE DIGIT PILOT LIGHT RED LED CABLE ASSEMBLY 24 CONDUCTOR RES NET 82 5 25W SWITCH MOMENTARY IC 8 CHANNEL SOURCE...

Page 175: ...REPLACEABLEPARTS Display Board Component Location Drawing Dwg No 263 l 10 942...

Page 176: ...REPLACEABLEPARTS lllllIlI iE 7 6 I 5 i 3 Display Board Schematic Diagram Dwg No 263 l 16 9 1319 14...

Page 177: ...NS PNF DhRLINGTON SGSITIPL2I TO 220 TRANS CLJRRENT RECULATOK CR120 TRANS P CHANNEL JFET J270 K 92 RES 470 S 1 4W COMPOSITION OR FILM RES 47 I LI4W COMPOsIT oN OR FILM RES 2 7K 5 l W COMPOSITION OR FLL...

Page 178: ...ON OR FILM RES 22M 5 1 4W COMPOSITION OR FILM RES lM 5 1 4W COMPOSITION OR FILM POT lOOK lO 5W NON WIREWOUND TRANSFORMER TERMINAL TEFLON IC 8 CHANNEL SOURCE DRIVER UDN2585 IC TEMPERATURE TRANSDUCER AD...

Page 179: ......

Page 180: ...I a I I...

Page 181: ...l OUTPUT Cable Assembly Triax Connector Cable Assembly includes SMB connector PlO Connector Pll Assembly Housing Contact Lug Binding Post Black Binding Post Red Binding Post Chassis Ground Shorting Li...

Page 182: ...___________ ___ 1 1 1 Analog Board Top Shield Bottom Shield Grommet 263 308 263 309 GR 46 Display Board 1 Card Guide cs 595 1 1 Ground Clip 617 320 1 Pushbutton SHIFT 228 317 4 14 Pushbutton CONTROL g...

Page 183: ...evice Dependent Command Summary t Auto On Auto On Auto On Kl SRQ E Ml6 M32 Calibration Value An _l L__r _I _ T Disable EOI Disable Charge done Ready Error Calibrate using value r l L r A A I A 4 7 9 4...

Page 184: ...APPENDIX A A 2...

Page 185: ...n addressed to listen SR Service Request Function SRl defines the ability of the instrument to request service from the controller RL Remot maI Function RUI defines the ability of the instrument to be...

Page 186: ......

Page 187: ...es 0 00 1 01 2 02 3 03 4 04 5 05 6 06 7 07 8 9 10 OA isi i c 13 OD OE OF 16 10 DLE ti 11 DC1 12 DC2 19 13 DC3 NUL SOH GTL STX BEL 20 14 21 15 22 16 23 I7 24 lk 25 19 26 lA 27 1B 28 1c 29 1D 30 lE DC4...

Page 188: ...2E 2F 30 2 33 34 2 37 SP i i 0 3 4 7 MLAO MLA 1 MLA 2 MLA 3 MLA 4 MLA 5 MLA 6 MLA 7 MLA 8 MLA 9 MLA 10 MLA 11 MLA 12 MLA 13 MLA 14 MLA 15 MLA 16 MLA 37 MLA 18 MLA 19 MLA 20 MLA 21 MLA 22 MLA 23 56 38...

Page 189: ...A 4B i 4E 4F 50 51 52 53 54 2 57 88 58 89 59 90 5A 5B 5c 93 SD 94 5E 95 5F A D E F G MTA7 H MTAR K L MTAO MTAl MTA2 MTA3 MTA4 MTA5 MTA6 MTA9 MTA 10 MTA 11 MT l2 MT 13 MTA 14 MTA 15 MTA 16 MTA 17 MTA...

Page 190: ...MSA 5 PPE MSA 6 PPE MSA PPE 106 6A 107 6B L 108 SC 1 MSA l2 I l E 109 6D m MSA l3 PPE 110 6E n MSA 14 PI E 111 6F 0 MSA lS PI E 112 ll3 114 135 116 117 118 119 120 70 n 72 73 74 75 76 77 78 MSA 16 lT...

Page 191: ...ess Offset address of routine Set PC 488 address Set for system control Execute INITIALIZE routine Line 30 sets the address of the PC 488 to 21 however any other valid address could be used as long as...

Page 192: ...er each line 5 Run the program and type in the desired command string For example to place the in u ment in the current function and 2OOfi range type in FlR9X and press the return key 7 The instrument...

Page 193: ...S 8 Send GTL to device 8 TRAWtlIT 3 CtlD s LISTEN B GTL J CALL THANStlITICtlD5r STATCIS Send SDC to device 8 THAHStlIT 3 CtWt sLI TEII 8 SjK f CALL TRANStlITICMUZ ST TUS Send DCL to all devices TRAHSt...

Page 194: ......

Page 195: ...o the instrument and obtain and display an instrument reading string Programs for the following controllers are included l IBM PC or KT with Capital Equipment Corporation PC 488 Interface l IBM PC or...

Page 196: ...the computer keyboard to get into the IBM interpretive BASIC language 4 Enter the lines below using the return key after each line 5 Run the program and type in the desired command string For example...

Page 197: ...drive type LQAD DECL and press the return key 5 Add the lies below to lines l 6 which are now in memory Modify the address in lies 1 and 2 as described in the National instruction manual 6 Run the pr...

Page 198: ...esired command string at the command prompt For exam ple to place the instrument in the current function and 2OOfi range type in F1R9x and press the return key 5 The instrument reading string wiIl the...

Page 199: ...the HP 85 computer 3 Enter the lies in the program below using the END LINE key after each line 4 Press the HP 85 RUN key and type in the desired command string at the command prompt For example to p...

Page 200: ...el 263 to the HP82937A GPIB interface installed in the computer 3 Enter the lines in the program below using the ENTER key after each line 4 Press the RUN key and type in the desired command string at...

Page 201: ...the program below using the STOREkey after each line Line numbers are automatically assigned by the 9825A 4 Press the 9825A RUN key and type in the desired command string at the command prompt For exa...

Page 202: ...iler as follows FORTRAN IEEE 5 Link with the system and IF libraries as follows LINK IEEEJBLIB 6 Type RUN IFEE and press the RETURN key 7 The display will read ENTER ADDRESS 8 Type in 8 and press the...

Page 203: ...ops sending data and indicates that data is not being sent 5 The listener aware that there is no data on the bus in dicates that it is ready for the next byte of data BUS DESCRIPTION The IEEE 488bus w...

Page 204: ...nal lines on the IEEE bus aregrouped into three different categories data lines management limes and handshake lines The data lines handle bus data and com mands while the management and handshake lin...

Page 205: ...bility of a bus hang up many controllers have time out routines that display messages in case the transfer sequence stops for any reason The instrument may begiven a number of specialbus com mands thr...

Page 206: ...commands are transmitted with ATN true X0 local Lockout LLQ is sent to the instrument to lock llttheir front panel controls F 4 ATN Line X X X L ow X Low Low Low Low LOW Low Low Low High Sets up devi...

Page 207: ...he device dependent commands will de pend on the configuration of the instrument Generally these commands are sent asone or more ASCII characters that tell the device to perform a specific function Th...

Page 208: ...0 30 48 X 58 88 Assumes primary address 8 HANDSHAKE COMMAND GROUP DAC DATA ACCEPTED RFD READY FOR DATA DAV DATA VALID UNIVERSAL COMMAND GROUP ATN ATTENTION DCL DEVICE CLEAR IFC INTERFACE CLEAR LLO LO...

Page 209: ...APPENDIX F Figure F 3 Command Codes F 7 F 8...

Page 210: ......

Page 211: ...TS Accuracy Checks 263 263 Programmed caange Output oomv oo ooomv OOmV 2o ooomv OOInV 1oo ooomv OOmV 19o ooomv 2 v ooooo v 2 v 20000 v 2 v 1 00000 v 2 v 1 90000 v 20 v 0 0000 v 20 v 2 0000 v 20 v 10 0...

Page 212: ...Programmed 617 Allowable 617 Reading 617 Range output Range wcto 28T Reading 2pA OOoOOpA 2pA lOcKl to lOOO 20 pA O OOOOpA 2pA lOOO to lOOO 2OOpA OO OOOpA 2pA lzoo to L oo 2nA ooooonA 2OpA 0 200 to 0 2...

Page 213: ...ble Calculated Current Range output Range Nominal Figure 196Reading 5450A Reading Current wcto 28T 3v MOkCl 6 3 L 3v 100kR 6 3 i 3v MOkSl 6 3 3v 100k d 6 3 I 3v 10kCl 6 4 L 3v lkil 6 4 99965fi to 10 0...

Page 214: ...A 20nA l9 0000nA 20nA l9 oooonA 200nA 190 000nA 200nA 190 0OOnA 3oomv lOOMa 3oomv l lMD 3oomv UXIMO 3oomv ILIOMR 300mV KIOMQ 300mV BJOMQ 3 v 1KIMil 3v 1COMil 3v lOMQ 3v lOM l A i 32 I i t 18 9383pA to...

Page 215: ...263 Programmed 6l7 Allowable 617Reading 617 Range Output Range WC to 28T I Reading I I I I 2OOpA 19O OOOpA 386 95to 193 05 I I 200 LA 190 000pA I I 200 FA 189 7l to 190 29 I I Reading limits determine...

Page 216: ...libration procedure in Section 8 Date Serial Number Table 8 3 Cold Volts Calibration Achlal DMM 263 Programmed Voltage Output 263 Calibration Range output MM Reading Value 3oomv 19o ooomv IIW IIIV 3 v...

Page 217: ...ng _ V V V XXIV V IllV 263 Calibration Value ML ML ML GL GL GL Table 8 6 Hot Volts Calibration Achml DMM 263 Programmed Voltage Output Range output DMM Reading 3oOmv 19o ooomv IIIV 3 v 1 9oooOV _ V 30...

Page 218: ...V ____ V V mV _ __ V IN 263 Calibration Value ML ML ML GL GL m e GL Table 8 9 Cold High Ohms Calibration Direct Measurement Method 263 263 Meastued Resistance Range Guard Calibration Value 1OMf l OFF...

Page 219: ...ect Measurement Method 263 263 Measured Resistance Range Guard Calibration Value 1OMR OFF MCl lOOMa ON Ma 1GR ON Gfl I 1OGD ON I I GO 1OOGn ON GCl Do not use this table if the ladder technique is used...

Page 220: ...rticular range or function bad specify a Batteries and fuses are OK 0 Checked all cable8 0 Calibration only a Data required 0 Certificate of calibration required attach any additional sheets as necess...

Page 221: ...Keithley instruments Inc...

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