Keithley 199, Instruction Manual

Page 1: ...Model 199 System DMM Scanner Instruction Manual Contains Operating and Servicing Information Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 Established 1981...

Page 2: ...least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting froti product modification without Keitbley s express written consent or misuse of any product ox part This warra...

Page 3: ...del 199 System DMM Scanner Instruction Manual 0 1988 Keith Instruments Inc Test Instrumentation Group All rights reserved Cleveland Ohio U S A July 1987 Fourth Printing Document Number 199 901 01 Rev...

Page 4: ...wear cracks or breaks before each use If any defects are found replace the test leads For optimum safety do not touch the test leads or the instrument while power is applied to the circuit under test...

Page 5: ...cw a wi sdw 3a...

Page 6: ...reading time CONNECTOR TWE Quick disconnect screw y inaIS X AWG maximum wire size MAXIMUM SIGNAL LEVEL 200 peak lM mA resistive load CONTACT LIFE 210 operations at maximum signal level I operations c...

Page 7: ...ding time could be several seconds depending on iiltering When filters are off TO command wer the bus can be SAvEd readings are made up of only one conversion STORE SHIFT STORE to enter data store SIZ...

Page 8: ...t were in one shot mode whether pmgmmmed to CONTlNUOUS or ONE SHOT Conversions are automatically synchronized to channel closures Channels will not close in the middle of conversions Any programmed DE...

Page 9: ...milliseconds l5msec to 999999msec VALUE v nn nnnn or Calibration value zzo value v n nnnnnrtE n CALIBRATION co Calibrate first point using value V 2 Calibrate second point using r e V Cd rate third p...

Page 10: ...OR STATUS WORD FORMATS UO Status Word Format Ul Status Word Format 4Pole Limit 1 2 CHAN4MAXERROR CHAN 4 MAX ERROR CHAN 4 MAX ERROR CHAN 4 MAX ERROR CHAN 4 MAX ERROR L DATA FORMAT 4Pole Limit 1 2 3 4 C...

Page 11: ..._ __ ___ a __ _ 2 5 REARPANELFAMILIARIZQION _ _ I __ _____ _ _ _ ii _ _ _ ____ ___ L _ _ 2 5 Connectors and Terminals t _ ___ I ___ __ i i i I _ _ ___ _ _ j __ 2 6 Line Voltage Aspects __ a _ _ ___ __...

Page 12: ...Y j _lY i CL i _ Y X 2 30 RatioMode _ I II _ I _ _ 2 30 Reading Interval L _ _ ___I _ ____ _ 2 30 Scan Limit I j _izii pYYi rpz _ 1 r r _ 1 i I I L L _ I 1 2 31 Manual Channel Mode _ __ i L _ _ _ 2 31...

Page 13: ...Self Test J _ _ _ _ _ 3 29 Hit Button H _ _ ___ _ 3 29 Display D _ _ _ 3 30 TRANSLATORSOFTWARE _______ _ 3 3 0 Translatoe Format _ __ _ 3 31 Wild Card ________ ______ _______ _ _ _______ _____ _______...

Page 14: ..._ i i ii_ _ _1 61 6 3 1 LineFuse L i _ _ 11 6 1 6 3 2 Current FUse L _ i _ __ f _ _i 6 2 6 4 CALIBRATION _ __ I _ _ __ I c a 1 6 2 6 4 1 Recommended Calibration Equipment __ _ ___ 6 2 6 4 2 Environmen...

Page 15: ..._ _ L 7 l ORDERING INFORMATION 7 1 FACTORY SERVICE _ I 7 1 SCHEMATIC DIAGRAMS AND COMPONENT LOCATION DRKWINGS 7 1 APPENDIX A ASCII CHARACTER CODES AND TEEE 188 MULTILINE INTERFACE COMMAND MESSAGES _...

Page 16: ...pical Program Flow Chart _ _ __ _ ____ _ 3 2 3 2 IEEE 488 Connector _ Y _ _ 3 4 3 3 IEEE 488 Connections _ _ _ _ _ _ __ _ _ _ __ 3 4 3 4 IEEE 488 Connector Location _ _ _ _ 3 5 3 5 ContactAssignments...

Page 17: ...Q Ranges _ __ I _ _ 6 7 6 5 Flowchart of AC Volts Calibration Procedure _ _I_ _ _ _ _ _ _ 6 10 6 6 TRMS AC Volts Call ration Configuration _ _ _ _ __ __ _ I ____ _ i _ i Y I 6 10 6 7 6 B TRMS AC Volts...

Page 18: ...jj ____ _ _ _ __ _ t________ 3 11 3 8 Device Dependent Command Summary _ __ _ __ __ __ __ _ _ 3 14 3 9 Range Comniand Summary _ _ _ _ __ _ ___ __ _ 3 17 3 10 Rate Command Summary _ _ _ _ _ 3 li3 3 11...

Page 19: ...AC Current Calibration 6 13 6 10 Recommended Troubleshooting Equipment 6 18 6 11 ModelWTroubIeshootingMode _ _ 6 19 6 12 Power Supply Checks _ I 6 21 6 13 Digital Circuitry Checks 6 21 6 14 Display Ci...

Page 20: ...s stored innon volatile memory can be used to replace standard com mand strings over the IEEE 493 bus l Optional Field Installable Internal Scanner Allows the unit to switch up to 8 2 pole channels or...

Page 21: ...ures for the instrument Thii information will be helpful if you wish to verify that the instrument is operating in compliance with its stated specifications l Section 5 contains a description of opera...

Page 22: ...phone tips 0 06 DIA two hooks and miniature alligator clips with boots Model 1992 4 8 Channel Scanner The Model 1992 Scan ner option allows scanning of four 4 pole channels or eight 2 pole channels T...

Page 23: ...connected to power line ground Failure to use a grounded outlet may result in personal injury or death because of electric shock CAUTION Be sure that the power line voltage agrees with the indicated...

Page 24: ...d forth between functions will not affect the unique configuration of each function However the instrument will forget the con figurations on power down unless they are saved only one instnnnent confi...

Page 25: ...is being used the chan nel number is displayed in the right most digit Function Indicators The indicator or indicators that are on identify the measurement function presently selected Range Indicator...

Page 26: ...alues to be subtracted from subsequent measurements and can also be used for zero correction paragraph 2 62 RESOLN toggles the display between 4 digit and 5 digit resolution The third function for thi...

Page 27: ...front wire resistance measurements and rear panel input terminals Front panel terminals are selected with the switch aut while rear panel term AMPS AMPS is used in conjunction with LO to make are sel...

Page 28: ...ed function Overrange Decimal pointy position and mnemonics define function and range 3k0 range shown The number of characters in the OVEKW message defines the display resolution 5 d resolut on shown...

Page 29: ...tage the voltage between input LO and chassis the voltage between input LO and chassis ground is 500V peak Exceeding this value may ground is 500V peak Exceeding this value may damage the instrument d...

Page 30: ...est leads or shielded test leads See paragraph 2 6 5 for low level measurement considerations 4 Press the ZERO button The display will read zero 5 Remove the short and connect the test leads to the si...

Page 31: ...trigger mode the FLTR indicator will flash until the filter is settled Readings will continue to update the display while the falter is settling but the display will not represent the final filtered...

Page 32: ...the order to achieve rated accuracy The zero correc area of the loop formed by the input leads Therefore tion procedure can be found in paragraph 26 2 minimize the loop area of the input leads and con...

Page 33: ...esistance greater than 1OOkQ or anytime 4 digit resolution is used to achieve a stable 1 Select the ohms function by pressing the QHMS buttqn 2 Select a range consistent with the expected resistance o...

Page 34: ...ltage offset Figure 2 6 TRMS AC Voltage Measurement 4 Con a the signal to be measured to the selected in put terminals as shown in Figure 2 6 2 6 8 Current Measurements DC or TRMS AC 5 Take the readin...

Page 35: ...ignal to be measured to the tiput of the Model 199 5 tenable the dB measurement mode by pressing SHIFT dB 6 Take the dB reading from the display WARNING With dB enabled a hazardous voltage baseline le...

Page 36: ...e is 6 37V while its RMS value is 7UV If we app ly the 1 11 correction factor to the average reading it can be seen that both meters will give the same reading resulting is no error in the average typ...

Page 37: ...arison of Average and TRMS Meter Readings Waveform lle AC AVerage AC Coupled Coupled Responding Averaging TRMS M r Peak RMS Meter M T Percent V E Vah Reading Reading Error O lov ZON 7 07v 47 zO7V 0 0...

Page 38: ...t the Model 199 to AC v s and autorange 3 Connect the Model 199 to the load of the amplifier 4 Adjust the frequency of the signal generat until ape AC voltage reading is measured on the Model 199 This...

Page 39: ...ss NFXT to scroll to the next program and save current multiplexer status 2 7 3 IEEE 488 Primary Address Programming The IEEE 488 primary address program allows you check or modify the IEEE 488 primar...

Page 40: ...requency setting and sending LOover the bus will not change the setting but will save the new frequency 3 An UNCAL error will default the IEEE 488 primary address to 26 and set the line frequency to 6...

Page 41: ...default conditions listed in Table 2 1 NOTES 1 The reset program can be aborted by pressing NEXT with the XESET NO message displayed 2 Once the instrument has been reset to default condi tions use sav...

Page 42: ...erval selection or press NEXT once more to return to normal display 2 8 4 Reading Interval The reading interval parameter determines the time period between individual readings when the instrument is...

Page 43: ...e 2 9 EXTERNAL TRIGGERING The Model 199 has two external BNC connectors on the rear panel associated with instrument triggering The EX TERNAL TRIGGER INPUT connector allows the instru ment to be trigg...

Page 44: ...W Begin Next Conversion zJ i I t10p b Minimum Figure 2 9 Meter Complete Pulse Specifications The following paragraphs describe front panel operating procedures for storing and recalling data 2 10 1 St...

Page 45: ...tore and return to normal operation press y hqion key If recall is also enabled you must first press NEXT to cancel recall and then press any iimc tion key 3 The RCL indicator will flash on when all p...

Page 46: ...tinuously in wrap around mode 2 11 SCANNER OPERATION WITH OPTION 1992 With the optional Model 1992 Scanner installed the Model 199 m scan four 4 pole channels or eight 2 pole chan nels The following p...

Page 47: ...the two red cables and two black cables together and then plug them into the rear panel VOLTS OHMS HI red and LO black jacks Figures 2X4 5 For 4 pole connections plug the cables in as shown in Figure...

Page 48: ...BASIC DMM OPERATION 8 4 POLE OUTPVT CONNECTlOHS Figure 2 11 Output Cable Connections 2 26...

Page 49: ...BASIC DMM OPERATION j CH 8 CH 6 CH 5 CH4 CH3 CH 2 IQ92 CARD Figure 2 12 Voltage Test Connections 2 w...

Page 50: ...BASIC DMM OPERATION CH 4 CH3 CH 2 I Reststors Under Test __ _ _ _ I_ Hi Ohms Figure 2 13 2 Pole Resistor Test Connections 2 28...

Page 51: ...DMM OPERATION CH8 CH7 CH6 CH5 I _ 1992 CARD k CH4 CH3 CH2 CH 1 Supplied Output Cables Resistors Under Test NOTE Connect All Test Leads Directly To Resistor Figure 2 14 4 Pole Resistor Test Connections...

Page 52: ...annel 1 reading as follows CHn R CHI Where R ratio CHn channel 2 through 8 CHl CHl The ratio mode is available for all three scan modes discussed below While in ratio the instrument displays the selec...

Page 53: ...mpt to program an improper channel limit the unit will briefly display the following CHAN 4 MAX or CHAN8MAX More information on channel limit programming can be found in paragraphs 2 118 and 2 11 9 2...

Page 54: ...ts over again with channel 1 12 To stop scanning and return to normal display select a liit of 0 press SCANNER 0 NOTES 1 If an interval too short for the present configuration is selected the instrume...

Page 55: ...nel limit at the following prompt LIMIT 10 Key in the desired limit l 8 2 pole l 4 4 pole with the data entry keys 11 The unit will then begin scanning one set of channels per programmed interval disp...

Page 56: ...xternal trigger pulse to initiate scanning at cahnnel 1 and storage For the STEF mode one channel per interval will be scanned and stored while in the SCAN mode one set of channels per trigger will be...

Page 57: ...ers with minimz4 external equipment The following paragmphs discuss two such amplifier test in and bandwidth testing Amplifier Gain The ratio mode used in conjunction with the scanner can be used to d...

Page 58: ...he signal generator to the desired output frequency 3OOkHz and amplitude for the gain test 11 Press TRIGGER to initiate the scan With the first trig ger the instrument will take amplifier input voltag...

Page 59: ...OO WC while a clean copper to copper junction will typically generate only O WC or less Ways to minimize the generation of thermoelectric poten tials include L Use only copper wires for all input and...

Page 60: ...mum scan rates available will be slower with the filter on than with it turned off The instrument will advise you if you have exceeded the maximum scan rates In the continuous trigger mode the INTERVA...

Page 61: ...DMM OPERATION r Shielded Low Thermal cables use pure copper wireto avoid thermals CHB CH7 CH6 CH 5 v0nages Under Test QQ CARD Low ThermalCable 1507 Figure 2 17 Using Scanner Card with Nanovoltm er 2 3...

Page 62: ...bus 3 lJl 3 ll 3 12 Using the Translator Mode Describes an alternate programming method of using easily recognized user defined words in place of device depeitdent commands Bus Data Transmission Tiss...

Page 63: ...c flow chart that a typical simple program will follow The program ming example below follows this general sequence This program wiU allow you to type in command strings to pro gram the instrument and...

Page 64: ...s in question The basic reading st g that the MC I 199 sends over the bus is in ASCII characters of the form NDCV 123456E O If you are using the programming example from Step_3 above simply type in th...

Page 65: ...488 bus as follows 1 Lie up the cable connector with the connector located on the rear panel of the instrument The connector is designed so that it will fit only one way Figure 34 shows the location o...

Page 66: ...SF Gnd 7 Gnd 8 Gnd 9 Gnd lo Gnd ll Gnd LOGIC Type Data Data Data Data Management Handshake Handshake Handshake Management Management Management Ground Data Data Data Data Management Ground Ground G o...

Page 67: ...MARY ADDRESS SELECTION The Model 199 must receive a listen command before it will respond to addressed commands over the bus Siiarly the instrument must receive a talk command before it will transmit...

Page 68: ...ples written in Hewlett Packard BASIC 4 0 This computer language was chosen for the examples because of its versatility in Controlling the IEEE 488 bus A partial list of statements for BASIC 4 0 is sh...

Page 69: ...error message type in the following lines LCCAL 7 Note that the NO REMOTE error message is briefly displayed when the second statement above is executed IDDC Illegal Device Dependent Command Error An...

Page 70: ...interval overrun error occurs when the instrument can not store readin s ai in the data store orescan at the pro gr ammed interv Q command However the instrument will continue to store readings as fas...

Page 71: ...ss the Model 199 to listen Pmgxamming Example Place the Model 199 in remote with the following statement PEMOTE 7215 The Model 199 should be in remote as indicated by the annunciator light If not chec...

Page 72: ...GTL command byte on the data lines The GTL command will not cancel LLO local lockout since it does not set REN false Programming Example Place the instrument in the remote mode with the following sta...

Page 73: ...mmand the controller must per form the following steps 1 Set ATN true 2 Address the Model 199 to listen 3 Place the SDC command byte on the data bus Notes 1 SDC will return the instrument to the defau...

Page 74: ...mmed by sending an ASCII F followed by a number representing the function option A number of commands may be grouped together in one string A command string is usuaIly terminated with an ASCII X chara...

Page 75: ...s as necessary to exit the menu 4 Send the command string over the bus one byte at a time Table 3 8 Device Dependent Command Summary Auto Auto Auto Auto 300mV 3OOmV 30mA 30mA 300 3V 3V 3A 3A 30 V 30 V...

Page 76: ...O Hn Da D Send machine status word Send error conditions Send Translator word list Send buffer size Send current value of V Send input switch status front rear Auto Cal multiplex disabled Auto Cal mul...

Page 77: ...th this example because no other commands were sent Note that the instrument re mains in the listener active state after the command is transmitted 3 9 2 Function F The function command allows the use...

Page 78: ...and the value of V For example with 0 5V on the input sending the command stings V2XZZ X will result with zero being enabled and the instrument reading 19 0 5 2 0 1 5 If 30 V is value is programmed a...

Page 79: ...eight trigger commands as follows TO Continuous on Talk Tl One shot on Talk T2 Continuous on GET T3 One shot on GET T4 Continuous on X T5 One shot on X T6 Continuous on External Tr er l7 One shot on E...

Page 80: ...us and display it on the computer CRT The second statement above sets the instrument to the A D converter reading mode The thii and fourth statements acquire the reading and display it on the CRT 3 9...

Page 81: ...00 3 9 10 Value and Calibration C One advanced feature of the Model 199 is its digital calibra tion capabilities instead of the more diificult method of adjusting a number of potentiometers the user n...

Page 82: ...l 199 and note that the instrument returns to the conditions in itially set in this example 3 9 12 Data Format G The G command controls the format of the data that the instrument sends over the bus Re...

Page 83: ...ding is completed or an overrange condition OCCUIS 2 If a bus error occurs 3 When the data store is full 4 When the data store is h full 5 If a trigger overrun error occurs Upon power up or after a DC...

Page 84: ...as explained in paragraph 3 9 16 An explana tion of each error can also be found in paragraph 3 9 16 Bit 2 Data Store Full Set when half the defied data store size is full Cleared by re enabling data...

Page 85: ...f bus until commands processed on X Upon power up or after the instrument receives a DCL or SDC command the instrument will return to Ko The EOI line on the IEEE 488 bus provides a method to positivel...

Page 86: ...e U4 Send the present value V U5 Send input switch stahw front rear When the command sequence UOX is transmitted the in strument will transmit the stahz word instead of its nor mal data string the nex...

Page 87: ...CR Mm RE DINt O ERFLoW 3 LF Mo oAT ST0RE F l L MW O TA STORE HALF FULL ZERO 2 MOs REAolNt DONE O DISAsLm MW READY l ENABLED M32rERROR CALlBRAnON SWrnH SCANNER N O D S sLED NO CHANNELs OPEN 1 ENABl Eo...

Page 88: ...erval BIG STRING Set if more than a 10 mzter message is sent using the display D command UNCAGSet when E PROM memory fails the self test Instrument calibration is invalid NO SCANNER Set if a scanner c...

Page 89: ...r3 END After entering the program run it by pressing the RUN key The machine conditions of the Model 199 wiIl be listed oii the CRT display To show that status is transmitted on ly once a normal readi...

Page 90: ...J byte in the Ul status word will be set to 2 An EY ROM failure is also flagged in the Ul status word If ROM and RAM fails the instrument will lock up See paragraph 67 2 for more information on these...

Page 91: ...the user todefine hi own words in place of Keithley s defined device dependent commands One word can replace a single command or a string of commands For example the word ACV can be sent in place of F...

Page 92: ...2 A Translator word cannot exceed 31 characters 3 The Translator buffer can hold approximately 100 B character Translator words 4 The character X and cannot be used in Translator words 5 The Model 19...

Page 93: ...used to select all options of a command With this feature a DDC option number is sent with the wild card Translator word The format for using the wild card is shown in the following example which defi...

Page 94: ...UP3 is the new Translator word SETlJPl and SETUP2 are words to be combined NEW is a reserved word that tells the instrument that SETUl and SETUP2 are Translator words and not Keithley device dependent...

Page 95: ...he format for doing this is demonstrated in the following pies SETUl l I lZK J3JNCTION 2 PlZlX When the first command string is sent over the bus the commands in SETUPI and the Keithley IEEE commands...

Page 96: ...e all Tram later words from temporary memory However Translator words that were saved in EIPROM by the SAVE command will again be available after power to the instrument is cycled Reset is RUN or DCL...

Page 97: ...sec 3KJmsec 3omA 7msec Elmsec 25 3msei 27 lmsec 30 9msec 34lmsec 3A 7 9msec J5lmsec 24 9msec 269msec 30 9msec 34 lmsec DCA 3omA 7 9msec 14 9msec 25 lmsec 28 lmsec 30 9msec 34 7ms e 3A 7 9msec 14 9msec...

Page 98: ...l 5 N16 2 CHAN 4 M AX ERROR CHAN 4 MAX ERROR iii s CHAN 4 MAX ERROR CHAN 4 MAX ERROR N19 CHAN 8 MAX ERROR CHAN 4 MAX ERROR N20 Stop scan all channels open 2 Pole Limit 4 Pole Limit N21 1 N22 2 Lizi 3...

Page 99: ...val is set by the Q command discussed in paragraph 3 12 3 Available triggers include front panel external trigger input rear panel and IEEE 488 talk GET and X commands The trigger source is determined...

Page 100: ...io between the channel 2 through 8 reading to the channel 1 reading in order to determine ratio the unit first takes a reading on channel 1 and then computes the ratio for the remain ing channels as f...

Page 101: ...al with the Q command For example send Q5OOX for a 5OOmse interval If you wish to trigger each chan nel separately select a one shot higggr mode This setup will require one trigger per channel or one...

Page 102: ...connected to the remaining channels as indicated The scanner output connections also differ For the Z pole mode Figure 3 lo OUT A and OUT B are strapped together H to H L to L and then c onnected to t...

Page 103: ...IEEE 466 PROGRAMMING CH 6 CH 7 CH 6 CH5 II Resistors Under Test Ch3 CH2 CH 1 Connect To Rear Panel Input Using Supplied Cables Figure 3 10 2 Pole Resistor Test Connections 3 42...

Page 104: ...IEEE 488 PROGRAMMNG Resistors Under Test I 1992 CARD To 199 To 199 Ohms Sense Volts Ohms Figure 3 11 4 Pole Resistor Test Connections 343...

Page 105: ...Z 12 a signal generator sup amplifier tests described above In order to use thii pro ests described above In order to use thii pro plies a test signal to the inputs of all seven amplifiers be 1_ gram...

Page 106: ...annel 8 limit SRQ on data store full Scan interval is one second Store size 8 turn on store Pause to make sure all is readv Trigger scan Get bus status Wait for SRQ on store full Serial poll to SRQ Re...

Page 107: ...IEEE 488PROGRAMMING Signal Generator CH3H CH4H To Channel Input L Terminals CHSH 1992 CARD Figure 3 12 Amplifier Gain Test Configurations 3 46...

Page 108: ...ent is still under warranty less than 4 4 RECOMMENDED TEST EQUIPMENT 1 year from the date of shipment and its perform ance falls outside the specified rage contact your Table 4 l lists all test equipm...

Page 109: ...el me ure ent consihera tions 4 Set the calibrator to output c3OOmV and verify that the reading is within the limits listed in Table 4 2 5 Disable zero and leave it disabled for the remainder of the D...

Page 110: ...cification Figure 4 2 Connections for TRMS AC Volts Verification 4 5 3 Ohms Verification With the Model 199 set to 5 d resolution verify the ohms function as follows CAUTION Donot exceed 425V peak or...

Page 111: ...Figure 4 3 Connections for Ohms Verification 1 Select the DC4 function and autoranze 2 Connect the DC ctieW calibration s ce to the Model 199asshownmF gure43 3 Set the calibration source to output 3Om...

Page 112: ...t the procedure for the 3A range by applying the AC current level listed in Table 4 6 Check to see that the reading is within the limits listed in the table Figure 4 5 Connections for DC Current Verif...

Page 113: ...Model 199 and applies that signal to the multiplexer DC Volts Signal conditioning for the 3OV and 300V ranges is per formed by resistor divider network R17 On these ranges Kl K2 and K3 are open and t...

Page 114: ...ance of 118kD R32 which results in a gain factor of 1110 The divided signal is then muted has a feedback resistance of ll8k0 0732 in parallel with pkfi R24 resulting in a gain factor of 11100 The divi...

Page 115: ...range because the relatively large output current can develop a signicatit voltage across the test leads affecting measurement accuracy Figure 5 2 shows the equivalent circuit of the input circuit Rx...

Page 116: ...F 0 I HI I I I 4Term I I I O corm I Rx 1 Se Hi Only I I RF3 I I 0 I I J sense I O Vi2 LO 1 sense LO t RS t I input I Lo I J R bet pm sense HI vn sense LO Vi2 Ref HI V Q Ref LO Figure 5 2 Input Configu...

Page 117: ...Multiplexer n Ref LO 3OOQ 3kQ To U24D of Multiplexer Input HI R Ref LO To 034 of 3OOkQ 3OOMR Multiplexer To Q30 of Multiplexer n Sense HI Rx R Sense LO To U24B of Multi xer Input q LO R R FW l Vl2 Se...

Page 118: ...D converter and the resultant data is that are part of the Model 159 measwement cycle and con used by the microprocessor to calculate the final reading nects them to the input buffer amplifier Figure...

Page 119: ...S OF OPERATION Signal Phase Zero Phase Reference Phase Calculate a Reading t l Calculate a Reading A Typical Voltage and Current Measurements 8 Typical Resistance Measurements Figure 5 5 Multiplexer P...

Page 120: ...f a software generated delay period that allows the signal to settle after the appropriate multiplexer FET is turned on Once the input is enabled the signal from thenbuffer amplifier is added to the l...

Page 121: ...4MHz l Clock I U43D ND Counts Output D Final Slope Comparator R60 U7 J6 Fi8 111 017 Duty Cycle Comparator D U5A vi Feedback control Circuit R9B R62 u45c 1 1OVR Figure 5 6 A D Converter Simplified Sche...

Page 122: ...icroprtiessor and the GI IBA The transceivers U6 and U7 are used to drive the output Data is buffered by U6 and U7 and is transmitted to the bus via connector J7 6 6 2 Display Circuitry The display in...

Page 123: ...ch of the eight input channels has a DPST double pole single throw relay associated with it in order to switch the HI and LO terminals separately The relays are connected in two four unit groups for m...

Page 124: ...e voltage See paragraph 6 3 1 for the fuse replacement procedure CAUTION The correct fuse type must be used to main tain proper instrument protection 3 Mark the selected line voltage on the rear panel...

Page 125: ...in step 2 Table 6 3 Currant Fuse Replacement Fuse Type Keithlcy Part No 3A UOV 3AG Normal B10 Fu 82 6 4 CALIBRATION Calibration should be performed every 12 months or if the performance verification...

Page 126: ...plished with calibration enabled To enable calibration push in on the CAL LOCK switch with an indated tool through the smaU access hole under the round label The instrument will briefly display the fo...

Page 127: ...By combining appropriate IEEE 488 com patible calibration equipment with a suitable test program calibration of the Model 199 could be performed on an automated basis Refer to Section 3 f complete in...

Page 128: ...he 300mV DC range Refer to paragraph 26 5 for low level measurement con siderations For front panel calibration press SHIFI LOCAL and proceed as follows A With the 3oo CKKJmVDCcalibration point displa...

Page 129: ...s 6 4 9 Resistance Calibration To calibrate the ohms function proceed as follows Figure 6 1 DC Volts Calibration Configuration 300mV Range NOTE For front panel calibration omit step 4 of thefollowing...

Page 130: ...ed fro several seconds raiges w g Table 6 g as a guide I Oumut HI n 4 Resistance Shielded Cable Figure 6 3 Four Wire Resistance Calibration Configuration 300S30kQ Ranges ohms rang using Table 6 6 as a...

Page 131: ...edures in step 3 for the remaining ACV ranges using Table 7 as a guide 4 For IEEE 488 bus calibration proceed as follows A Set the AC voltage calibrator to output 3OO OOOmV at 5cQHz B After allowing s...

Page 132: ...strument as shown in Figure 6 6 CLSet the Model 199 to the 3oov range and set the AC calibrator to output lOO OCNV at a frequency of 7QkHz WARNING Some procedures require the use of high voltage Take...

Page 133: ...MAINTENANCE Panel or IEEE Adjust Trim Capacitors Step 6 ACV Calibration Figure 6 5 Flowchart of AC Volts Calibration Procedure Figure 6 6 TRMS AC Volts Calibration Configuration 6 10...

Page 134: ...ON SHIELD WHEN USED WITH FLOATING SOURCES r 300 AC RANGE ADJUSTMENT r 30VAC RANGE I I ADJUSTMENT ACCESSIBLE THROUGH HOLE IN SCANNER BOARD WHEN UNIT IS SO EQUIPPED Figure 6 7 TRMS AC Volts High Frequen...

Page 135: ...Table 6 8 as a guide 4 For IEEE 488 bus calibration proceed as follows A Set the current calibrator to output 3O OOOOrnA B After allowing sufficient time for the calibrator cur rent to settle send th...

Page 136: ...r to output 3 ooOOOmA at 5ooHz D After aJlowing sufficient time for the calibrator cur rent to settle send the following command over the bus V3E 3XCK Both calibration constants will automatically be...

Page 137: ...to the rear panel D Remove the four screws that secure the left grooved side uanel then remove the side Danei 1 E Pry the digital board free at connector Pl6 at the end next to the power transformer u...

Page 138: ...MAINTENANCE Figure 6 10 Model 199 Exploded View 645...

Page 139: ...Install Jumper to Connect Digital Common to Chassis Ground Digital Board P15 J15 To Trigger Jacks J14 To Display Board JlUF 16 To Analog Board Analog Board Front h 12345 00000 Figure 6 11 Connector Lo...

Page 140: ...is left to the technician Note that schematic diagrams and component location draw ings which are an essential aid in troubleshooting are located at the end of Section 7 6 7 1 Recommended Test Equipm...

Page 141: ...ode is selected as follows N 01 9 Using Table 6 Q reference the selected N mode to the present range and function to determine which switch Use Power supply and DC voltage checks analog signal tracing...

Page 142: ...5 E K4 E K4 cl K J cl K3 a K3 c2 lc3 K2 K3 c2 K3 a K3 Kz K3 Range Switches Closed Qll U22A Qll U22A Qll U22A Q11 Uz 4 011 u22A 611 u22A Qll U22A Qll U22A QI 3 Qll U22A 413 QlL UZI A QB QlL USA Q13 QlL...

Page 143: ...22C U24C Ql2 43 U27yC U24C Ql2 Q3 U22C U24C Ql2 Q3 U22C U24C QIZ Q3 UUC U24C K2 K3 Ql2 QI3 U22C U24C K2 K3 Ql2 QI3 U22C U24C Xi a K3 412 QJ 3 U22C U24C Xl K2 K3 Ql2 413 U22C U24C K2 K2 xl K2 412 UUC U...

Page 144: ...pin 9 l m Switch data 5V or OV 98 10 11 12 I3 U8 pin 19 Variable pulse train W to 5V Ul pin 4 Variable pulse train OV to 5V U38 pin I3 Variable pulse train OV to 5V US pins I2 through 16 Variable pul...

Page 145: ...s referenced to analogy ground Pl pins 1 and 2 Power on safe guard Control CLOCK Conhl DATA Control STROBE Close selected channel using SCANNER button Check HI and LO for each relay close relay with S...

Page 146: ...nd B outputs together H to H L to L and then connect the outputs to the VOLTS OHMS Hl and LO terminals on the rear panel H to HI L tom ID Use the supplied output cables 3 Plug the connecting blocks in...

Page 147: ...jumper can be cut to float the shields channel inputs Assuming the scanner card functioned normally the unit is now reading for use or to connect another potential for example for guarding CAUTION 6 8...

Page 148: ...nner Operation SC2llller Board Jumper Wl cut to float relay shields Route Ribbon Cable Under Scanner Board Digital Board Jumper W2 shown installed in position 6 2 Conductor cable Front Figure 6 13 Sca...

Page 149: ...replacement parts contact you Keithley representative or the factory See inside front cover for addresses When ordering include the following information 1 Instrument Model Number 2 instrument Serial...

Page 150: ...S13 Sl S13 S5 S8 Ul u2 u4 u5 CAP 1uF 20 50V GERAMIC DISPLAY DIGITAL DOUBLE DIGIT PILOT LlGHT RED LED MOUNTING KIT FOR PL 71 S MK 22 3 CABLE ASSEMBLY 26 CONDUCTOR CA 27 4 PUSHBUTrON CAPS 8228 317 5 SW...

Page 151: ...D s 2 l 20 87 E 12615 REUISED S Z 2 2 28 F 15162 CHG D ARTWORK FROM REU E TO F j 4 10 92 Sll s12 s13 Sl s7 ss s10 NOTE INSTRLL MK 22 3 UNDER DS6 THRU DSlO DSl2 THRU OS14 DS16 DS17 PUSHBUTTON SELECTION...

Page 152: ......

Page 153: ...u3 U4 u5 U6 u7 U8 u9 lC lO INPUT AND OR INVERT ARRAY PALiOL8 IC 8 BIT MICROPROCESSING UNIT 68B09 lC 8 CHANNEL SOURCE ORIVER UON2585 IC HEX INVERTER74HCO4 IC OCTAL EDGE TRIG FLIP FLOP 74HCT374 IC QUAD...

Page 154: ...OOL 661 ON firna fiU MWa uolle30 1 weuodluo3 PJpOg le1 6 a E L 2Jn6y I Ll 3ltK l ON3 NOISInXl ON 033 Ill...

Page 155: ...a I 0 I m a sl ii...

Page 156: ...35V ELECTROLYTIC CAP lO OOOuF 20 30 25V ALUM ELEC CAP 22pF 10 1000V CERAMIC CAP 820p l0 1000V CERAMIC CRl CR3 CRl2 CRl6 CR13 CA14 CR15 CFl6 CR7 cRa cm I DIODE DIFFUSED lN414 DIODE SILICON W04M DIODE E...

Page 157: ...5 8K 1 1ISW METAL FILM RES 7 87K l i 1 8W METAL FILM RES 142 8K 1 118W RES 560K 5 1 4W COMPOSlTlON OR FILM RES 18 2K 1 1 8W METAL FILM RES 8 25K l 118W METAL FILM RES 2K 5 1 4W COMPOSITION OR FILM RES...

Page 158: ...M339 SELECTION 325 IC CMOS ANALOG SWITCH DG211 IC 18V OP AMP LF353N IC TRMS TO DC CONVERTER 637JD IC DUAL JFET INPUT OP AMP LF412 IC 8 STAGE SHIFTISTR REGIST MCl4094BCP IC DARLINGTON TFiANS ARRAY ULN2...

Page 159: ...I I w I I J 000000...

Page 160: ...r 0 I 0 I m I a...

Page 161: ...n I r l I m I a n m cl I 0 I m I 2 L a...

Page 162: ...4 I b 0 I 0 I a I a...

Page 163: ...I t 1 I m...

Page 164: ......

Page 165: ...T FOOT ASSEMBLY FRONTPANEL FF4ONT PANEL OVERLAY LINE CORD LUG MODIFIED CROSS EXTRUSION MODIFIED SIDE EXTRUSION PEM STUD FIEARBEEL REARFCOT REAR PANEL SCANNER COVER PLATE WlNDow BJ 12 0 BJ 12 2 BJ 12 9...

Page 166: ...10 PIN OPEN END HEADER CONN STRAIGHT POST HEADER 3 PIN RELAY DPST CS 626 10 cs 533 3 RL 77 CABLE ASSEMBLY 10 CONDUCTOR CONN PLUG 10 PIN W STRESS RELIEF CONN HOUSING 3 PIN CA 32 6 CS 611 70 cs 534 3 T...

Page 167: ......

Page 168: ...a cl I 0 I rn I T m r a m...

Page 169: ...ages 0 00 1 01 2 02 3 03 4 04 05 06 7 07 8 08 i l 3 OD 14 OE 15 OF 16 10 l7 11 18 19 20 14 ii E 23 17 24 18 25 19 26 lA 27 1B 28 1c 29 1D 30 lE 31 lF EZ l Message sent or received with ATN true NUL SO...

Page 170: ...F 48 49 SO 51 z 54 55 30 31 z 34 35 36 37 38 39 3A 3B 3C 3D 3E 63 3F MLAO MLAl MLA2 MLA 3 MLA4 MLA 5 MLA6 ML 47 MLA 8 MLA9 MLA 10 MLA 11 MLA I2 MLA 13 MLA 14 MLA 15 MLA i6 MLAl7 MLA I0 MLA 19 MLA 20 M...

Page 171: ...80 50 81 51 iz 2 84 a5 Et 56 57 ii 59 58 90 5A 91 58 92 SC zi 5D 5E 95 5F t3 A D E F G H n MTA7 MTA8 MT 49 MIX 10 MI4 11 MTAl 2 MTAl3 Mm 14 MTAl5 W 4 16 EE Mm 19 MTA 20 MT 4 21 MTA22 MTA 23 MTA 24 MTA...

Page 172: ...x 79 Y 7A MSA O Pl MSA 1 PPE MSA 2 PPE MSA 3 PpE MSA 4 Pi E MSA 5 l PE MSA 6 PPE MSA i Pl E MSA 8 PPE MSA 9 PPE MSA 10 l PE MSA 11 PPE MSA l2 Pl E MSA l3 l PE MSA 14 PPE MSA l5 PPE MSA 16 PPD MSA I7...

Page 173: ...the instrument and obtain and display an instrument reading string Programs for the following cor ollers are included l IBM PC or AT with National Instruments GPIB PC IEEE 488 Interface l IBM PC or A...

Page 174: ...BM computer 3 Type in BASICA on the corn keyboard to get into the IBM interpretive BASIC language 4 Place the interface software disk in the default drive type LOAD DECL and pr s the return J Y 5 Add...

Page 175: ...n below using the return key after each line 4 Run the program and type in the desired command string at the command string prompt For example to place the instrument in the ACV function and autorange...

Page 176: ...orange type in FIROX and press the return key 5 The instrument reading string will then appear on the CRT A typical display is NACV O OOOC0E O PROGRAM COMMENTS I Z CHE 26 Terminator 29 INPClTG i r jFj...

Page 177: ...P 85 computer 3 Enter the lines 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 place...

Page 178: ...HPIB interface installed in the computer 3 Enter the computer EDIT mode 4 Enter the lines in the program below using the ENTER key after each line 5 Run the program and type in the desired command str...

Page 179: ...the program below using the STORE key after each line Line numbers are automatically assigned by the 9fJ A 4 Press the 9825A RUN key and type in the desired command string at the command prompt For e...

Page 180: ...tem and IB libraries as follows LINK IEEE IBLIL 6 Type RUN IEEE and press the RETURN key 7 The display will read ENTER ADDRESS 8 Type in 26 and press the RETURN key 9 The display will read TEST SETLP...

Page 181: ...ker and listener The contdler does what its name implies it controls other devices on the bus A talker sends data usually to the con troller and a listener receives data Depending on the in strument a...

Page 182: ...eight data lines to transmit and receive data in bit parallel byte serial fashion These lines use the con vention DIOI DI08 instead of the more common DO W DIOl is the least significant bit while DI0...

Page 183: ...f Command Type Command ATN Lie Comments Uniline REN Remote Enable X Sets up devices for remote operation EOI X Marks end of transmission IFC Interfack Clear X Clears Interface AIN Attention Low Define...

Page 184: ...e which is used to determjne which device on the bus is requesting service SPD Serial Poll Disable SPD is used by the controller to remove all devices on the bus from the serial poll mode and is gener...

Page 185: ...de vice dependent cornman ds wiIl depend on instroment configuration Generally these commands are sent as one or more ASCII characters that command the device to perform a specific action For example...

Page 186: ...I 1 I Is...

Page 187: ...evice dependent command se quence In this instance ATN is true while the instrument is being addressed but it is set high while sending the device dependent command string I I I I Data Bus I ASCII Hex...

Page 188: ...s Display or output check one c I Drifts 0 Unable to z 0 Unstable 0 Will not read applied inp t 0 Overload 0 Certifi te ofCalibration required attach any additional sheets as necessary Show a block di...