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1. KEITHLEY Service Form Model No Serial No Date Name and Telephone No Company List all control settings describe problem and check boxes that apply to problem Intermittent LJ Analog output follows display LI Particular range or function bad specify LI IEEE failure 3 Obvious problem on power up Batteries and fuses are OK Front panel operational All ranges or functions are bad LI Checked all cables Display or output check one CI Drifts Unable to zero LJ Unstable CI Will not read applied input 3 Overload Calibration only 3 Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement system including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory ou
2. START 900 090 MHz STOP 50 DOO ODD MHz Figure 2 23 3 8 Bandwidth Crosspoint 1 closed Rs 500 TRN log MAG 5 48 REF O dB ls 2 9945 dB 882 795 Hz j 2 EDM 2 i 1 START 300 000 MHz 50 000 000 MHz Figure 2 24 3 Bandwidth Crosspoint H12 closed Rs 500 2 25 SECTION 2 Operation TRN log MAG 10 dB REF O cB 1 60 244 dB START 300 000 MHz STOP 50 000 000 MHz Figure 2 25 Crosstalk Crosspoints G1 and H2 closed 509 sourceon ROWG 50Q load on COL UMN 1 Measurements at ROW H 2 26 iC dB REF O dB 1 57 784 dB 1 odo log MAG START 5 Ic MHz 50 000 000 MHz Figure 2 26 Crosstalk Crosspoints A11 and B12 closed 50Q source on ROW A 50Q load on COLUMN 11 Measurements at ROW B SECTION 3 Applications 3 1 INTRODUCTION General applications to test thick film resistor networks and transistors are provided in this section These appli cations are intended to demonstrate the versatility of us ing the matrix card in test systems The first application Thick Fi
3. SECTION 4 Service Information Figure 4 1 Relay Post Setup icai Cox OR I OR UE Rp RON ESS Figure 4 2 Path Resistance Testing grs e b e dU AG o Figure 4 3 Common Mode Offset Current Testing Figure 4 4 Differential Mode Offset Current Testing Figure 4 5 Contact Potential Testing a caa Fu eade GRON EU cis daw doas Figure 4 6 Path Isolation Testing Guarded 254 006 co x Res SEF REN ERR A OR Figure 4 7 Differential Isolation Testing Kd SEA Figure 4 8 Common Mode Isolation Testing ok Figure 4 9 ID Data Timing Diagram 4 Figure 4 10 D sub Receptacle Contact Assignments List of Tables SECTION 2 Operation Table 2 1 Column Number Assignments Table 2 2 4 X 24 Matrix Crosspoint Table 2 3 Available Cables and Connectors Table 2 4 Cable Conductor Identification Model7075 MTC Table 2 5 Model 7076 RMTC Conductor Identification Table 2 6 Model 7076 CMTC Conductor Identification
4. Table 2 7 Narrow Matrix Expansion 2 5 Table 2 8 Wide Matrix Expansion ai esses AA DUC Rana eR OSM ERE AU Eur CSS WR SECTION 4 Service Information Table 4 1 Verification Equipment i v EVER dac Eque ad FAR EE E Table 4 2 Path Isolation Tests eee te uh pA Ue Table 4 3 Differential and Common Mode Isolation Test Table 4 4 Recommended Troubleshooting Equipment Table 4 5 Troubleshooting Summary Ru x EVA cc eds WW SECTION 1 General Information 1 1 INTRODUCTION This section contains general information about the Model 7076 General Purpose Matrix Card Dual 4 x 12 1 2 FEATURES The Model 7076 is a general purpose two pole dual 4 x 12 four row by 12 column matrix card Some of the key features include Guard capability Each HI path on the PC board is sur rounded by second path that can be used for guard ing Low contact potential and offset current for minimal effects on low level signals Quick disconnects using 25 pin D Sub connectors on the rear panel Row backplane jumpers Cutting jumpers disconnects rows from the Model 707 backplane Column jumpers Installing jumpers configures card as an 8 x 12 matrix 1 3 WARRANTY INFORMATION Warranty information is located on the inside front cove
5. Instrumentation Row 6 L1 CLOE ch Rows Connected together at instruments r ETIT Rows Connected together at Instruments To Mode 7076 Backplane Jumpers Installed Figure 2 16 Dual 4x 72 Matrices 2 7 3 Wide Matrix Expansion By installing the column jumpers of the Model 7076 the card becomes configured as an 8 x 12 matrix see graph 2 4 2 Assuming that the backplane jumpers of the Model 707 and 7076s are installed each 8 x 12 matrix card installed in the mainframe extends the matrix by 12 col umns For example three Model 7076s configured as 8 x 12 matrices installed in the Model 707 will result in an 8 x 36 matrix An example of an 8 x 36 matrix is shown in 7076 Column Slot 1 Jumpers Model 7076 Backplane Jumpers Installed Mainframe Backplane Jumpers Installed Figure 2 17 Wide Matrix Example 8 x 36 2 18 Tm 1 1 rw gt 133123 2 6 60 7076 5014 Slot 5 54 Mainframe Backplane Jumpers Removed 6 LI Lil tio 49 49 706 Slot 6 Figure 2 17 Table 2 8 summarizes the wide eight rows matrix possibilities for a single Model 707 mainframe With the column jumpers installed column 1 is con nected to column 1 column 2 is connected to column 2 and so on Thus when connecting DUT or instrumenta tion to the columns of the matrix it is recommended that only one
6. y 202 Matrix Multiplexer System 2 24 SECTION 2 Operation 2 9 BANDWIDTH AND CROSSTALK Figure 2 23 through Figure 2 26 show typical AC re sponse curves for 3dB bandwidth and crosstalk Meas urements for the four plots were performed using the HP 8752A Network Analyzer under the following condi tions 1 The Model 7076 backplane jumpers are installed and configured per factory default 2 The Model 7076 is configured as dual 4 x 12 matricies 3 The Model 7076 is installed in slot 1 of the Model 707 mainframe The other mainframe slots are empty 4 500 source Rs and 50 load Bandwidth Figure 2 23 shows the 3dB bandwidth with matrix crosspoint closed The 500 source is connected to ROW A and the 50Q load is connected to COLUMN 1 Figure 2 24 shows the 3dB bandwidth with crosspoint 12 closed The 509 source is connected to ROW the 50Q load is connected to COLUMN 12 Crosstalk Figure 2 25 and Figure 2 26 show typical crosstalk for ad jacent pathways For Figure 2 25 crosspoints 11 and 812 are closed The 509 source is connected to ROW and the509 load is connected to COLUMN 11 Measure ments are made at ROW B For Figure 2 26 crosspoints G1 and H2 are closed The 500 source is connected to ROW G and the 500 load is connected to COLUMN 1 Measurements are made at ROW H 1 3 0001 d 35 195 838
7. CARU BRAS SECTION 2 Operation 2 1 INTRODUCTION i i444 Mees __ ____ 22 HANDLING PRECAUTIONS GG RUN A bas 2 3 CARD INSTALLATION AND REMOVAL 24 BASIC MATRIX 241 4X24M803X A I EES AO E 2 4 2 Bx12 MAX obs eo Ck 2 5 TYPICAL MATRIX SWITCHING SCHEMES 2 5 1 Single ended Switching cc ce cee eee eee hh mnn 25 2 Differential Switching ETO Ro 253 Guarding a 2 5 4 Sensing A 2 6 CONNECTIONS 2 6 1 Standard Cable Model 7075 1 42 7 2 6 2 High Isolation Cables Model 7076 RMTC and Model 7076 2 7 MATRIX EXPANSION RA EROR SERE ACE 2 7 1 Backplane Row Jumpers ht 2 7 2 Narrow Matrix Expansion 2 7 3 Wide Matrix 2 2 7 4 Partial Matrix Implementation
8. I Model 196 Output F Common Ud se TT Model 7076 Model 224 Figure 3 7 Transistor Ir Measurements SECTION 3 Applications Measure Vorl Model 196 Source V Model 7076 Note Installed column jumpers between rows D and E shown in Figure 3 4 are not shown in this illustration Figure 3 8 Transistor Measurements 3 10 SECTION 4 Service Information 41 INTRODUCTION This section contains information necessary to service the Model 7076 and is arranged as follows 4 2 Handling and Cleaning Precautions Discusses han dling procedures and cleaning methods for the matrix card 4 3 Relay Test Program Explains how to connect the ma trix card to the Model 707 mainframe for the relay test program 4 4 Performance Verification Covers the procedures necessary to determine if the card is operating properly 4 5 Principles of Operation Briefly discusses circuit op eration 4 6 Special Handling of Static Sensitive Devices Re views precautions necessary when handling static sensi tive devices 47 Troubleshooting Presents some troubleshooting tips for the matrix card 42 HANDLING AND CLEANING PRECAUTIONS Because of the high impedance circuits on the Model 7076 care should be taken when handling or servicing the card to prevent possible contamination which could degrade performance The following precautions should be taken when han
9. th 2 75 Mainframe Matrix Expansion Y 222 2 8 TYPICAL CONNECTION SCHEMES 2 8 1 Single Card System 2 2 8 2 Multiple Card System 2 2 8 3 Multiple Mainframe System 13132222 2 8 4 Matrix Multiplexer mmn 29 BANDWIDTH and CROSSTALK SECTION 3 Applications 31 INTRODUCTION 515233 EGO C EE EE 3 2 THICK FILM RESISTOR NETWORK TESTING 321 Four terminal Ohms Measurements 3 2 2 3 3 3 3 1 3 3 2 Voltage Divider Checks TRANSISTOR TESTING Current Checks cu ato dha ep eese Eu NEGO PRA TRE SECTION 4 Service Information 4 1 4 2 43 44 44 1 4 4 2 443 444 4 4 5 4 4 6 4 4 7 4 48 4 5 4 5 1 4 5 2 4 5 3 4 6 4 7 4 7 1 4 7 2 SECTION 5 Replaceable Parts 5 1 5 2 5 3 5 4 5 5 INTRODUCTION dw CE ERES E HANDLING AND CLEANING PRECAUTIONS RELAY TEST PROGRAM SET UP PERFORMANCE VERIFICATION Environmental
10. 11 12 13 On the Model 617 select the 2 range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure On the Model 617 set the voltage source for 100V and select the 200nA current range Make sure the voltage source is still in standby Place the Model 617 in the measurement func tion by pressing SHIFT OHMS Turn on the Model 707 but do not program any crosspoints to close All crosspoints must be open On the Model 617 disable zero check and press OP ERATE to source 100V After allowing the reading on the Model 617 to settle verify that it is gt 1GQ This measurement is the leak age resistance isolation of ROW A Place the Model 617 in standby and enable zero check Program the Model 707 to close crosspoint 1 On the Model 617 disable zero check and press OP ERATE to source 100V SECTION 4 Service Information 14 15 After allowing the reading Model 617 to settle verify that it is also gt 1GQ This measurement checks the isolation of COLUMN 1 Using Table 4 3 as a guide repeat the basic proce dure of steps 11 through 14 for the rest of the col umns and rows test numbers 3 through 32 of the ta ble Note that starting with test 17 the Model 617 4 10 16 17 must be connected to ROW E Place the Model 617 in standby and turn the Model 707 off Connect the Model 617 to ROW shown in Figure 4 8 an
11. Figure 2 20 Multiple Card System Example san RA Figure 2 21 Multiple Mainframe Example iu cid d Sh tee na LA Figure 2 22 Matrix Multiplexer System sen Y NG Figure 2 23 Bandwidth Crosspoint A1 closed Rs Ri 500 Figure 2 24 3db Bandwidth Crosspoint H12 closed Rs Ree 500 Figure 2 25 Crosstalk Crosspoints G1 and 2 closed 500 source on ROW 50Q load on COLUMN 1 Measurements 2 26 Figure 2 26 Crosstalk Crosspoints 11 and B12 closed 50Q source on ROW A 50Q load COLUMN 11 Measurements ROW B hire a eher 2 26 SECTION 3 Applications Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Thick Film Resistor Network Testing a GR ee cheats nee ee 4 Terminal Ohms Measurements Voltage Divider Checks RY Owe ak cae sean Transistor Testing eer NA RA RW A Roda Wy E AAA Transistor Current Gain Checks Common Emitter Characteristics of an NPN Silicon Transistor Transistor Iz Measurements Transistor Measurements
12. 2 1 0 9 8 7 6 5 4 Col 12 Gd 6 6 6 6 6 6 6 0 6 Col 12 HI A COLUMNS Receptacle 1 of 2 Columns A D Rows Columns E H High Gd Guard View of receptacles looking at Rear Panel Pin identification for the D sub receptacles is provided in Figure 2 11 Adjacent to the each contact designation of the D sub receptacles i is the corresponding row or col umn that it is internally connected to Cable Connections There are two basic cable types available to make connec tions to the matrix card the standard cable Model 7075 and high isolation cables Model 7076 RMTC and Model 7076 Basically the stan dard cable is a general purpose cable that will mate to either the ROWS or COLUMN receptacles The high iso lation cables provide better isolation between paths The Model 7076 RMTC is used to connect to the ROWS tacle while the Model 7076 CMTC is used to connect to the COLUMN receptacles The available cables as well as some miscellaneous con nectors for customized user supplied terminations are Row Gd Row A HI 2020 Row Gd Row B Gd Row HI Row B Gd Row C Gd Row C HI 000 Row C Gd Row D Gd Row D HI Row D Gd Row E Gd Row E HI Row E Gd Row F Gd Row F HI Row F Gd Row G Gd Row G HI Row G Gd Row H Gd o 000000 Row H HI
13. O On Ow Ou Qo Os Qo Ow Row H Gd B ROWS Receptacle No connection Figure 2 11 D sub Receptacle Contact Assignments 2 10 SECTION 2 Operation Table 2 3 Available Cables and Connectors Model or Part Number Keithley Model 7075 MTC Standard Cable Standard three meter 10 feet cable assembly terminated with 25 pin D sub plugs on both ends Mates to either the ROWS or COLUMN receptacles of the matrix card Three meter 10 feet high isolation for high isolation cable assembly terminated with 25 pin D sub plugs on both ends Use to mate to either COLUMNS receptacle of the matrix card Three meter 10 feet high isolation for high isolation cable assembly terminated with 25 pin D sub plugs on both ends Use to mate to the ROWS receptacle of the matrix card 25 pin D sub plug that will mate to the ROWS and COL UMN receptacles of the matrix card Solder cup connections simplify the building of custom cables 25 contact D sub receptacle that will mate to cables termi nated with a 25 pin D sub plug Plastic backshell housing for CS 400 High isolation cable Same cable used for the Models 7076 RMTC and 7076 CMTC cable assemblies See para graph 2 6 2 for description 25 pin D sub plug for customized ribbon cable assemblies unction shell for 3M 8225 7000 D sub plug Keithley Model 7076 CMTC High Isolation Columns Cable Keithley Model 7076 RM
14. Figure3 3 Voltage Divider Checks SECTION 3 Applications 3 3 TRANSISTOR TESTING A matrix system for testing dc parameters of transistors is shownin Figure 3 4 The Model 7076 is configured as an 8 x 12 matrix This system uses a current source Keithley Model 224 a voltage source Keithley Model 230 and a DMM Keithley Model 196 to measure current and or voltage This system tests three transistors but can be ex panded to test more by simply using additional Model 7076 matrix cards The Model 707 will accommodate six matrix cards Daisy chaining five Model 707s expands thesystem to 30 matrix cards allowing 90 transistors to be tested NOTE To check FETs or transistors that have high gain or low power equipment that has lower Offset current and higher impedance must be used To check these devices the Keithley Model 7072 Semiconductor Matrix Card and the Keithley Model 617 Electrometer can be used 3 3 1 Current Gain Checks The dc current gain of a general purpose transistor can be checked by configuring the transistor as a common emit ter amplifier Figure 3 5 shows which crosspoints to close to configure the amplifier circuit In this circuit gain is calculated by dividing collector current measured by the Model 196 by base current sourced by the Model 224 profile of the transistor operating characteristics can be obtained by measuring the collector current over a speci fied voltage range V for differe
15. C ACCESSORY SUPPLIED Instruction manual jumpers for 8 x 12 expansion Specifications subject to change without notice COLUMNS to rear panel connector 12 3 4 5 6 7 8 9 10 11 12 160 09 00 00 00 00 00 09 B C 2 years Column panel Jumpers connectors DEW User installable to configure E as8x 12 F G H 8 4 Backplane 1 2 3 4 5 6 7 8 9 10 11 12 Jumpers COLUMNS factory to rear panel connectors installed Table of Contents SECTION 1 General Information 1 1 INTRODUCTION a ___ ___ ee 12 FEATURES coa 1 3 WARRANTY INFORMATION HE MENT 14 MANUAL ADDENDA 451142924 dep eund a 15 SAFETY SYMBOLS AND TERMS dd E RH BERET Vae a p e WE TREES 16 SPECIFICATIONS iwi dawns CA GAD GEN Rege dos pcd SORE 1 7 UNPACKING AND INSPECTION Sed eee T E RR n 174 Inspection for Damage 45 46 2 8 Y 1 7 2 Shipping __ _ 1 73 Instruction Manual eRe AUD UU OECD 1 8 REPACKING FOR SHIPMENT 19 OPTIONAL ACCESSORIES GG GY REN EY
16. Col 8 Gd Row E Gd Col 8 Hi Row F HI Col 9 HI Columns Row F Gd 6000000066 Col 9 Gd Row F Gd 10 Gd Row G Gd Col 10 HI Row G HI Col 11 Gd Row G Gd Col 11 HI View of receptacles looking at Rear Panel Row H HI Row H Gd 9 8 7 6 5 4 Col 12 Gd On Ou Oo On Oz Oz 6 6 6 Col 12 HI Row H Gd A COLUMNS Receptacle HI High ROWS Receptacle 1 of 2 Gd Guard N C No connection Figure 4 10 D sub Receptacle Contact Assignments Table 4 5 Troubleshooting Summary Step Items Component Required Condition W152 6V de W155 5V dc W150 High logic pulse at beginning of each card identification byte transfer sequence upon power up 6V supply 5V supply CLR ADDR line W151 NEXT ADDR line Low logic pulse before each byte transfer W149 Clk line 1 79MHz clock W154 ID Data line Card identification logic pulse train on power up W156 Power up safeguard Remains low during power up W157 RELAY DATA line Logic pulse train to load relay configuration registers W158 STROBE line High logic pulse to strobe relay configuration registers 0100 through 0113 Relay drivers 6V for open crosspoints OV for closed crosspoints Note pins 10 through 16 that pin 10 on U100 and U107 is not connected All measure
17. plate The cover plate is fastened to the mainframe chassis with two screws Retain the cover plate and screws for future use 3 With therelay side of the matrix card facing towards the fan feed the card into the slot such that the top and bottom card edges seat into the card edge guides of the mainframe Slide the matrix card all the way into the mainframe and tighten the two spring loaded panel fasteners WARNING The mounting screws must be secured to en sure a proper chassis ground connection be tween the card and the mainframe Failure to properly secure this ground connection may resultin personal injury or death due to elec tric shock 4 remove the card from the mainframe make sure the Model 707 is off power is removed from external circuitry and then reverse the above procedure 2 4 BASIC MATRIX CONFIGURATIONS A simplified schematic of the Model 7076 matrix card is shown in Figure 2 2A As shipped from the factory the matrix card is configured as two separate 4 x 12 matrices Each of the 96 crosspoints is made up of a two pole switch By closing the appropriate crosspoint switch any matrix row can be connected to any column in the same matrix In this manual the columns of every Model 7076 matrix card are referred to as columns 1 through 12 and 1 through 12 Columns 1 through 12 correspond to the col umns receptacle on the connection panel labeled TO ROWS D while references to columns 1 th
18. 2 Operation Mounting Screws 43 Card Handle Figure2 1 Matrix Card Installation Table2 1 Column Number Assignments 7076 Card Location Matrix Column Numbers 1 through 12 13 through 24 25 through 36 37 through 48 49 through 60 61 through 72 2 2 3 SECTION 2 Operation 2 3 4 5 6 7 8 9 10 11 12 Backplane Jumper Sets 8 Column Jumpers Card shipped with supplied jumpers not instal led as shown Ea E SEES p m gt 2 4 5 9 12 Column gt m gt Row L Note 7076 Installed in slot one of Model 707 Mainframe Crosspoint Assignments Figure 2 2 Model 7076 2 4 SECTION 2 Operation m 100 IIIIII MIIIIIII IIIIIIIMIIIIIII III I III I WOU I LI GU BHUPBBELU GHUE GUBDGIBBDB GBBUSGBEHU WR 37 aW Sw ow T RUNDE EXDNR ORNL PROT 1 1 2 SCIL GE ICE p eise 99909000 Backplane Jumpers Figure 2 3 Simplified Component Layout 2 5 SECTION 2 Operation 2 4 1 4 x 24 Matrix Figure 2 4 shows how the Model 7076 can be configured as a single 4 x 24 matrix Row jumper wires are used to connect rows and D to rows Gand H respec tively These connections can be made wherever it i
19. 7076 s backplane jumpers installed the performance verification procedures must be performed with only one matrix card the one being checked in stalled in the Model 707 mainframe Also the Model 707 must not be daisy chained to another Model 707 These conditions do not apply if the jumpers are already re moved 4 2 Relay Test Terminal Block CAUTION Contamination will degrade the perform ance of the matrix card To avoid contamina tion always grasp the card by the handle and side edges Do not touch the edge connectors of the card and do not touch the board sur faces or components On plugs and recepta cles do not touch areas adjacent to the elec trical contacts NOTE Failure of any performance verification test may indicate that the matrix card is contami nated See paragraph 4 2 to clean the card If the test still fails after cleaning then try clean ing the backplane see the Model 707 Instruc tion Manual 4 4 1 Environmental Conditions All verification measurements should be made at an am bient temperature between 18 and 28 C and ata relative humidity of less than 70 SECTION 4 Service Information 4 4 2 Recommended Equipment 2 Remove the matrix card column jumpers if they are installed Table 4 1 summarizes the equipment necessary for per 3 Install the Model 7076 in slot 1 of the Model 707 formance verification along with an application for each 4 Asshown in Figure 4 2 connect all ter
20. Conditions Recommended Equipment x ARR bodes deere Matrix Card Connections Path Resistance Tests Offset Current Tests 586 6 5 rm Switching y oesi segoun EAE RE OR RO WY AYAU WA Power Up Safeguard SPECIAL HANDLING OF STATIC SENSITIVE DEVICES TROUBLESHOOTING isi as dees wire bU oe ear bd ga P eR A Recommended Equipment i444 Y RECORD ees Troubleshooting Procedure GOR ete Metres bad INTRODUCTION Lia br debe uem w t Sake eran EAR rac ac bd RANGER WU PARTS ceva dc ta EROR VOR ORDERING INFORMATION ER eR RATE ees EU FACTORY SERVICE ter UCD sc blades esi ese List of Illustrations SECTION 2 Operation Figure 2 1 Matrix Card Installation a eee ETON ERS R e do AR Figure 2 2 Model 7076 255356 vies Figure 2 3 Simplified Component Layout YF ERROR AN RWY Vos ee Figur
21. Guard COLUMN 10 HI COLUMN 10 Guard COLUMN 9 HI COLUMN 9 Guard COLUMN 8 HI COLUMN 8 Guard COLUMN 7 HI COLUMN 7 Guard COLUMN 6 HI COLUMN 6 Guard COLUMN 5 HI COLUMN 5 Guard COLUMN 4 HI COLUMN 4 Guard COLUMN 3 HI COLUMN 3 Guard COLUMN 2 HI COLUMN 2 Guard COLUMN 1 HI COLUMN 1 Guard Conductor 1 of the ribbon cable is identified by the red tracer 2 6 2 High Isolation Cables Model 7076 RMTC and Model 7076 CMTC Shielded high isolation cables Model 7076 RMTC and Model 7076 CMTC are available to optimize perform ance by minimizing crosstalk between signal paths Each signal path in the cable is completely surrounded by Guard insulated foil to maximize the effects of guard ing The outer foil shield of the cable is connected to the housings of the D sub plugs This shield is connected to chassis ground when the cable is connected to a Model 7076 that is properly installed in the Model 707 main frame The Model 7076 RMTC is a 3 meter 10 feet 28 conduc tor cable terminated with a D sub plug on each end The plug pin assignment for this cable is configured to mate with the ROWS receptacle of the matrix card Pin identifi cation for this cable is shown in Figure 2 13A The Model 7076 CMTC is a 3 meter 10 feet 28 conduc tor cable terminated with a D Sub plug on each end The plug pin assignment for this cable is configured to mate with either of the two COLUMN receptacles of the matrix ca
22. Path Isolation Tests These tests check the leakage resistance isolation be tween adjacent paths A path is defined as the high H and guard G circuit from a row to acolumn that results by closing a particular crosspoint In general the test is performed by applying a voltage 100V across two ad jacent paths and then measuring the leakage current across the paths The isolation resistance is then calcu lated as V I In the following procedure the Model 617 functions as both a voltage source and an ammeter In the V I function the Model 617 internally calculates the resistance from the known voltage and current levels and displays the resistance value NOTE Refer to Figure 4 6 for the following proce dure 1 Turn the Model 707 off if it is on 2 Remove the matrix card column jumpers if installed 3 Install the Model 7076 in slot 1 of the Model 707 10 Model 7076 Connect the Model 617 to ROWS A and B as shown in Figure 4 6 Make sure The voltage source is in standby Also make sure there are no other connec tions to the card WARNING The following steps use high voltage 100V Be sure to remove power from the circuit be fore making connection changes On the Model 617 select the 2pA range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure On the Model 617 select the 20pA range and release zero check On the Model 617 press sup
23. aid in troubleshooting the matrix card The schematic drawing of the matrix card is shown on drawing number 7076 106 located at the end of Section 5 4 5 1 Card Identification Identification coding and a matrix configuration table are stored in an erasable programmable read only memory EPROM This information is sent to the Model 707 so that it knows which type of matrix card is installed in that particular mainframe slot This enables the Model 707 to send valid configuration data to the matrix card On power up control line CARDSEL goes low turning on the EPROM U128 That control line as well as the other control lines from the Model 707 are buffered by U130 Lines CLK NEXT ADDR and CLR ADDR along with counter 17126 control the task of loading data from the EPROM into the parallel to serial shift register U127 Data sent from U130 to the Model 707 via the IDDATA line is strobed by the CLK control line The timing dia gram in Figure 4 9 shows the first byte of identification data during the transfer sequence For subsequent bytes the CLRADDR line stays low CARDSEL CLRADDR NEXTADDR 4 5 2 Switching Circuitry Matrix configuration data is sent from the Model 707 via the RELAY DATA control line and is serially loaded into the 12 shift registers U114 through U125 The matrix card relays configure accordingly when the registers re ceive the STROBE signal from the Model 707 A relay is energized when a relay driv
24. as a guide repeat the basic proce dure of steps 13 through 18 for the rest of the path pairs starting with test 3 4 4 8 Table 4 2 Path Isolation Tests Row A Col 1 to Row B Col 2 Row Col 2 to Row C Col 3 Row C Col 3 to Row D Col 4 Row C Col 4 to Row D Col 5 Row C Col 5 to Row D Col 6 Row C Col 6 to Row D Col 7 Row C Col 7 to Row D Col 8 Row Col 8 to Row D 9 Row Col 9 to Row D Col 10 Row C Col 10 to Row D Col 11 Row C Col 11 to Row D Col 12 Row D to RowE Row E Col 1 to Row F Col 2 Row F Col 2 to Row G Col 3 Row G Col 3 to Row H Col 4 Row G Col 4 to Row H Col 5 Row Col 5 to Row H Col 6 Row Col 6 to Row H 7 Row G Col 7 to Row H Col 8 Row Col 8 to Row H Col 9 Row Col 9 to Row Col 10 i Differential and Common Mode Isolation Tests These tests check the leakage resistance isolation be tween high and guard differential and from Test No Path Isolation Row G Col 10 to Row H Col 11 Row G Col 11 to Row H Col 12 Row and Row Test Equipment Crosspoints Locations Closed Row A and Row B Al and B2 Row B and Row B2 and C3 Row C and Row D C3 and D4 Row C and Row D C4 and D5 Row C and Row D C5 and Row C and Row D C6 and D7 Row C and Row D C7 and D8 Row C a
25. bendorf 41 1 8219444 Fax 41 1 820308 Keithley Instruments Taiwan 1 Ming Yu First Strect Hsinchu Taiwan R O C 886 35 778462 Fax 886 35 778455
26. column s receptacle be used 7076 Slot 6 Note With column jumpers Installed COL lines are connected to COL lines Table 2 8 Wide Matrix Expansion Installed Matrix Card Resulting Matrix Mainframe backplane row jumpers between slots 3 and 4 of main frame must be installed for a matrix larger than 36 columns 2 7 4 Partial Matrix Implementation A fully implemented matrix provides a relay at each po tential crosspoint For example a fully implemented 8 x 36 matrix utilizing three 8 x 12 matrix cards contains 288 crosspoints A partially implemented 8 x 36 matrix would contain fewer crosspoints An example of a par tially implemented 8 x 36 matrix is shown in Figure 2 18 The partial matrix is still 8 x 36 but contains only 192 crosspoints using two matrix cards Model 7076 1 is con figured as 4 x 24 matrix Notice in Figure 2 18A that the Model 7076 backplane jumpers for rows E through H are cut These jumpers must be cut in order to isolate Model SECTION 2 Operation 7076 1 from rows E through H of the other matrix card in the mainframe see Figure 2 18B An obvious advantage of a partial matrix is that fewer matrix cards are needed Another reason to use a partial matrixis to keep certain devices from being connected di rectly to other certain devices For example a source in Figure 2 18B cannot be connected to a column of Model 7076 1 with one accidental crosspoint closure Three specific crosspo
27. paths for COLUMNS 4 through 12 test procedures to understan connection re crosspoints A4 through A12 quirements 13 Connect the OHMS LO and OHMS SENSE LO test leads of the Model 196 DMM to the guard G termi nal of ROW A 4 4 4 Path Resistance Tests 14 Repeat steps 9 through 12 to check the guard G ter minal paths of ROW A Referring to Figure 4 2 perform the following steps to 15 Repeat the basic procedure in steps 8 through 14 for verify that each contact of every relay is closing properly ROWS and D and that the resistance is within specification 16 Connect all terminals of matrix columns 1 12 to gether to form one common terminal 17 Connect OHMS HI and OHMS SENSE HI of the 1 Turn the Model 707 off if it is on Model 196 to the common terminal It is recom Table 4 1 Verification Equipment Model or Part Specifications Applications DMM Keithley Model 196 3000 0 01 Electrometer w voltage source Keithley Model 617 10pA 100pA 1 6 100V source 0 2 Path resistance Offset current path isolation Contact potential Offset current Contact potential Nanovoltmeter Triax cable unterminated Low thermal cable unterminated Keithley Model 181 2mV 0 015 Keithley Model 7025 Keithey Model 1484 4 3 SECTION 4 Service Information Model 196 Measure 4 Wire Ohms Ohms Sense LO Note Set up shown is configured to test the high H terminal of row A t
28. the various matrix con figurations that are possible by using multiple cards The significance of backplane row jumpers on matrix con figurations is also covered here 2 8 Typical Connection Schemes Provides examples of external connections for single card multiple card and multiple mainframe systems 2 2 HANDLING PRECAUTIONS To maintain high impedance isolation care should be taken when handling the matrix card to avoid contami nation from such foreign materials as body oils Such contamination can substantially lower leakage resis tances degrading performance To avoid possible contamination always grasp the card by the handle and side edges Do not touch the edge con nectors of the card and do not touch board surfaces or components On D subminiature D sub connectors do not touch areas adjacent to the electrical contacts CAUTION Do not store the card by leaning it against an object such as a wall with its edge connec tors in contact with a contaminated surface such as the floor The edge connectors will become contaminated and tapes and solder connections on the PC board may break as the card bends ALWAYS store the card in its anti static bag in the original shipping carton Dirt build up over a period of time is another possible source of contamination To avoid this problem operate the mainframe and matrix card in a clean environment If the card becomes contaminated it should be thor oughly cleane
29. 0146 Milano 39 2 48303008 Fax 39 2 48302274 JAPAN Keithley KK Aibido Bldg 7 20 2 Nishishinjuku Shinjuku ku Tokyo 160 81 3 5389 1964 Fax 81 3 5389 2068 NETHERLANDS Keithley Instruments Avelingen West 49 4202 MS Gorinchem 31 0 183 635333 Fax 31 0 183 630821 SWITZERLAND Keithley Instruments SA Kriesbachstrasse 4 8600 D bendorf 41 1 8219444 Fax 41 1 8203081 TAIWAN Keithley Instruments Taiwan 1 Ming Yu First Street Hsinchu Taiwan R O C 886 35 778462 Fax 886 35 778455 General Purpose Matrix Card Dual 4 x 12 Model 7076 Instruction Manual 1990 Keithley Instruments Inc All rights reserved Cleveland Ohio U 5 A Document Number 7076 901 01 All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand and product names are trademarks or registered trademarks of their respective holders SAFETY PRECAUTIONS The following safety precautions should be observed before using the Model 7076 and the associated instruments This matrix card is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read over this manual carefully before using the matrix card ALWAYS remove power from the entire system Model 707 test instruments DUT etc and discharge any capacitors before doing any of the following 1 Installing or removi
30. 7076 follows the parts list MODEL 7076 PARTS LIST CIRCUIT DESIG 100 116 C117 118 C119 120 121 C122 123 124 CR100 CR101 CR102 J1001 1003 K100 195 R100 R101 R102 R103 R104 R105 U100 113 U114 125 U126 U127 U128 U129 U130 W100 W101 124 W125 140 149 158 ORDER FIRMWARE REVISION LEVEL INDICATED ON IC PACKAGE DESCRIPTION REAR PANEL ASSEMBLY CHASSIS ASSEMBLY CHIPLOC BAG LABEL CAUTION CONN BERG INSTRUCTION MANUAL PEM NUTS HOLE SIZE SOCKET LC 28 PIN SHIELD BOTTOM HANDLE CAP 1UF 20706 50V CERAMIC CAP 01UF 2070 50V CERAMIC CAP 01UF 10976 1000V CERAMIC 270 20 100 CERAMIC FERRITE CAP 47UF 10 16V ALUM ELEC CAP 10UF 20 100 25V ALUM ELEC DIODE DIODE SILICON IN4148 DO 35 DIODE SCHOTTKY IN5711 SCREWLOCK FEMALE CS 721 1 TO PANEL CONNECTOR RIGHT ANGLE D SUB SOCKET RELAY ULTRA SMALL POLARIZED TQ2E 5V RES 10K 596 1 4W COMPOSITION OR FILM RES 200 576 1 4W COMPOSITION OR FILM RESA7K 596 1 4W COMPOSITION OR FILM RES 11K 576 1 4W COMPOSITION OR FILM RES 5 1K 576 1 4W COMPOSITION OR FILM RES 120K 596 1 4W COMPOSITION OR FILM IC DARLINGTON ARRAY 2003 IC 8 BIT SHIFT LAT REG 74HC4094 IC 12 STAGE BINARY COUNTER 74HCT4040 IC 8 BIT PARALLEL TO SERIAL 74HCT165 PROGRAMMED EPROM IC QUAD 2 INPUT NAND 74 IC OCTAL BUFFER LINE DRIVER 74HC244 STIFFENER BOARD CONN BERG 2 PIN JUMPER SUPPLIED ACCESSORY CONNECTOR JUMPER POUC
31. H KEITHLEY PART NO 7076 303A 7076 MECH 2 PO 14 6 MC 487 CS 339 7076 901 01A FA 135 7076 102B 50 69 7075 306 HH 33 1 C 365 1 C 237 01 C 64 01 C 386 270P C 321 47 C 314 10 RF 34 RF 28 RF 69 CS 725 CS 721 1A RL 136 R 76 10K R 76 200 R 76 47K R 76 11K R 76 5 1K R 76 120K 206 713 545 548 7076 800 399 489 J 16 CS 339 2 1 15 5 476 1 LT 0000 VI ib 60 ew cae ae EAE NS 60 lt 799096 YSU 3678 959000000000 bd J 1 1 RIS E gt gt
32. KEITHLEY Model 7076 General Purpose Matrix Card Dual 4 x 12 Instruction Manual Contains Operating and Servicing Information Publication Date April 1991 Document Number 7076 901 01 Rev B WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be defective To exercise this warranty write or call your local Keithley representative or contact Keithley headquarters in Cleveland Ohio You will be given prompt assistance and return instructions Send the product transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the origi nal warranty period or at Jeast 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to follow instructions THIS WA
33. RRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDI RECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAMAGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland OH 44139 216 248 0400 Fax 216 248 6168 http www keithley com CHINA Keithley Instruments China Yuan Chen Xin Building Room 705 No 12 Yumin Road Dewai Madian Beijing China 100029 8610 2022886 Fax 8610 2022892 FRANCE Keithiey Instruments SARL BP 60 3 all e des Garays 91122 Palaiseau C dex 31 6 0115155 Fax 31 6 0117726 GERMANY Keithley Instruments GmbH Landsberger Stra e 65 82110 Germering 49 89 849307 0 Fax 49 89 84930759 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 44 01734 575666 Fax 44 01734 596469 ITALY Keithley Instruments SRL Viale S Gimignano 38 2
34. TC High Isolation Rows Cable Keithley CS 400 Keithley 5 401 Keithley Belden CS 590 9868 3M 3M 8225 7000 3357 9225 summarized in Table 2 3 The cables available from The same basic procedure applies for connecting the ca Keithley are described in more detail in paragraphs 2 6 1 ble plug to a test fixture receptacle and 2 6 2 2 6 1 Standard Cable Model 7075 MTC WARNING To avoid electrical shock that could result in The standard cable Model 7075 MTC is a three meter injury or death ALWAYS remove power 10 feet general purpose 24 conductor shielded cable from the entire system Model 707 test in that is terminated with a 25 pin D sub male plug on each struments DUT etc and discharge any ca end that will connect to either the ROWS or COLUMN re pacitors before connecting or disconnecting ceptacles on the matrix card cables from the matrix card The pins of the cable connectors are easily accessible mak EI ing them extremely hazardous to handle The standard cable shown in Figure 2 12 is comprised while power is applied of a flat ribbon cable that is located inside a shielded round cable casing The braided shield of the cable sur rounds the ribbon cable and is subsequently connected to chassis ground when the cable is connected to a Model Use the following procedure to connect a cable termi 7076 that is installed in a Model 707 mainframe nated w
35. acer Note View from mating end of plug D Sub plug S Braided shield surrounds ribbon cable strumentation and DUT while the other ends will mate to the ROWS and COLUMN receptacles of the matrix card The conductor designations of the ribbon cable are shown in Figure 2 12 The red tracer identifies conductor 1 of the ribbon cable Table 2 4 is provided to corre spond theribbon cable conductors to the matrix card row or column terminal For example if the standard cable is connected to the ROWS receptacle ribbon cable conduc tor 24 will correspond to Row A Guard of the matrix card If the cable was instead connected to the COL UMNS receptacle ribbon cable conductor 24 will corre spond to Column 1 Guard of the matrix card SECTION 2 Operation Table 2 4 Cable Conductor Identification Model 7075 gt ROW LI Guard ROW H HI ROW Guard ROW G Guard ROW G HI ROW G Guard ROW F Guard ROW F HI ROW Guard ROW E Guard ROW HI ROW E Guard ROW D Guard ROW D HI ROW D Guard ROW C Guard ROW C HI ROW C Guard ROW B Guard ROW B HI ROW B Guard ROW A Guard ROW A HI ROW A Guard OMNIA OL WL Matrix Row Column Terminal Ribbon Connected to Connected to Cable ROWS COLUMNS Conductor Receptacle Receptacle COLUMN 12 HI COLUMN 12 Guard COLUMN 11 HI COLUMN 11
36. all the matrix card in slot 1 of the Model 707 As shown in Figure 4 5 short high to guard of columns 1 through 12 Set the Model 181 to the 2mV range short the input leads and press ZERO to null out internal offset Leave zero enabled for the entire procedure oo M 10 11 12 13 14 15 16 Model 7076 Connect the Model 181 to a ROW A as shown in the illustration Turn on the Model 707 Program the Model 707 to close crosspoint A1 Verify that the reading the Model 181 15 lt 5 IV This measurement is the contact potential of the pathway From the Model 707 open crosspoint A1 Repeat the basic procedure in steps 8 through 10 to check the rest of the pathways crosspoints A2 through A12 of the row Connect the Model 181 to ROW B and repeat the ba sic procedure in steps 8 through 11 to check crosspoints B1 through B12 Repeat the basic procedure in step 12 for the remain ing rows ROWS C and D Short high HI to guard G of columns 1 through 12 Connect the Model 181 to Row E Repeat the basic procedure in steps 8 through 13 to test ROWS E through H Model 1484 Low Thermal Cable Unterminated Model 181 Measure Volts Setup shown is configured to test Row A crosspoinis for contact potential SECTION 4 Service Information Low Thermal short clean high purity copper 1 of 12 H A HO fU Figure4 5 _ Contact Potential Testing 4 4 7
37. ame system configurations Also a system us ing the matrix card with a multiplexer card Keithley Model 7075 is shown to demonstrate versatility and compatibility All of the examples use Model 7076s con figured as 4 x 24 matrices Also the examples show Model 7075 cables or Model 7076 CMTC and Model 7076 RMTC cables In many in stances these cables are best utilized by cutting them in half Cutting them provides twice as many cables and al 2 20 lows direct connection to instrumentation and DUT Ca bles could just as well be custom built to better suit a par ticular application 2 8 1 Single Card System Figure 2 19 shows how external connections for a single card system might by made Instrumentation is con nected to matrix card rows using a standard cable Model 7075 MTC for general purpose testing or a high isola tion cable Model 7076 RMTC for critical tests that re quire optimum isolation In a similar manner DUT is connected to the matrix card using a standard cables or the Model 7076 CMTC high isolation column cables No SECTION 2 Operation Note Rows A through D jumpered to rows through H at the instruments Instrument Test Fixture 7076 RMTC or 7075 MTC 7076 CMTC or 7075 MTC cables DUT s A EE 123456789 017 2 3 4 5 6 T 9 10 1712 Equivalent Circuit Figure 2 19 Single Card System Example tice that cutting one of these cables in half will provide two co
38. cable that is fitted into a shielded round jacket This cable is commonly cut at a convenient length to pro vide two separate cables The cables can then be used to connect to both the ROW and COLUMN receptacles The unterminated ends of the cables can then be connected to instrumentation and DUTs Model 7076 RMTC High Isolation Row Cable Assembly The Model 7076 RMTC is a three meter 10 feet 28 con ductor cable terminated with a 25 pin D sub connectors onboth endsand is configured to mate to the ROW recep tacle of the Model 7076 Each conductor pair signal and drain of the shielded cable is wrapped with insulated foil to minimize crosstalk between conductor pairs This cable is commonly cut at a convenient length to pro vide two separate cables The cables can then be used to connect to both COLUMN receptacles The unter minated ends of the cables can then be connected to in strumentation and DUTs SECTION 1 General Information Model 7076 CMTC High Isolation Column Cable Assembly The Model 7076 CMTC is 3 meter 10 feet 28 conduc tor cable terminated with a 25 pin D sub connector on both ends This cable connects to either one of the two COLUMN receptacles on the Model 7076 Each conduc tor pair signal and drain of the shielded cable is wrapped with insulated foil to minimize crosstalk be tween conductor pairs This cable is commonly cut at a convenient length to pro vide two separate cables The cables
39. can then be used to connect to both COLUMN receptacles The unter minated ends of the cables can then be connected to in strumentation and DUTs SECTION 2 Operation 21 INTRODUCTION WARNING The matrix configuration procedures in this section should only be performed by quali fied personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Review the safety precautions found at the front of this manual This section contains information on aspects of matrix card operation and is arranged as follows 2 2 Handling Precautions Details precautions that should be observed when handling the matrix card to en sure that its performance is not degraded due to contami nation 2 3 Card Installation and Removal Covers the basic pro cedure for installing and removing the card from the Model 707 Switching Matrix 2 4 Basic Matrix Configurations Covers the basic matrix configurations that the card can be configured for dual 4 x 12 matrices a single 4 x 24 matrix or a single 8 x 12 ma trix 2 5 Typical Matrix Switching Schemes Explains some of the basic ways that a matrix can be used to source or measure Covers single ended switching differential floating switching sensing shielding and guarding 2 6 Connections Discusses the various methods and techniques that can be used to connect DUTs and instru mentation to the matrix card 2 7 Matrix Expansion Discusses
40. cep tacles of the matrix card 1 6 SPECIFICATIONS Model 7076 specifications may be found at the front of this manual These specifications are exclusive of the ma trix mainframe specifications 1 7 UNPACKING AND INSPECTION 1 7 1 Inspection for Damage The Model 7076 is packaged in a re sealable anti static bag to protect it from damage due to static discharge and 1 1 SECTION 1 General Information from contamination that could degrade its performance Before removing the card from the bag observe the fol lowing precautions on handling Handling Precautions 1 Always grasp the card by the handle and side edges Do not touch the edge connectors and do not touch board surfaces or components 2 When not installed in a Model 707 mainframe keep the card in the anti static bag and store in the origi nal packing carton After removing the card from its anti static bag inspect it for any obvious signs of physical damage Report any such damage to the shipping agent immediately If you are going to install the card in the Model 707 main frame at this time be sure to follow the additional han dling precautions explained in paragraph 2 2 1 7 2 Shipping Contents The following items are included with every Model 7076 order Model 7076 Dual 4 x 12 Two pole Matrix Card Column jumper sets Model 7076 Instruction Manual Additional accessories as ordered Note that the cables may be shipped in a separate packin
41. d as explained in paragraph 4 2 2 3 CARDINSTALLATION AND REMOVAL WARNING To avoid electrical shock that could result in injury or death ALWAYS remove power from the entire system Model 707 test in struments DUT etc and discharge any ca pacitors before doing any of the following 1 Installing or removing the matrix card from the mainframe 2 1 SECTION 2 Operation 2 Connecting or disconnecting cables from the matrix card The pins of the cable connec tors are easily accessible making them ex tremely hazardous to handle while power is applied 3 Making internal changes to the card such as removing or installing jumpers Cable connections to the matrix card make it difficult to install or remove the card from the mainframe Thus it is advisable to install the card and then make cable connec tions to it Conversely cables should be disconnected be fore removing the card from the mainframe Referring to Figure 2 1 perform the following procedure to install the Model 7076 matrix card in the Model 707 CAUTION Contamination will degrade the perform ance of the matrix card To avoid contamina tion always grasp the card by the handle and side edges Do not touch the edge connectors of the card and do not touch the board sur faces or components On connectors do not touch areas adjacent to the electrical con tacts 1 Turn the Model 707 off 2 Select a slot in the mainframe and remove the cover
42. d repeat steps 8 through 16 to check common mode isolation Table 4 3 Differential and Common Mode Isolation Test OA Ul i CO Test No Test ROW A COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 COLUMN 9 COLUMN 10 COLUMN 11 COLUMN 12 ROW B ROW C ROW D ROWE COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 COLUMN 9 COLUMN 10 COLUMN 11 COLUMN 12 ROW ROWG ROW H Differential or Common Mode Crosspoints Closed None Al A2 A3 A4 A5 A6 A7 8 9 10 All 12 A1 and B1 A1 and C1 and D1 None El E2 4 5 E6 E7 E8 E9 E10 12 El and F1 and G1 Ei and H1 SECTION 4 Service Information Model 7025 Unterminated Banana to Banana Cable L Measure Model 617 Unterminated Banana Cable Model 7076 Figure 4 7 Differential Isolation Testing Model 7025 Unterminated Banana to Banana Cable Triax Cable Source V and Model 617 Unterminated Banana Cable Note Electrometer high is connected to chassis ground Model 7076 Figure 4 8 Common Mode Isolation Testing 4 11 SECTION 4 Service Information 45 PRINCIPLES OF OPERATION The paragraphs below discuss the basic operating princi ples for the Model 7076 and can be used as an
43. del 617 enable zero check and the Model 707 open crosspoint A1 Repeat the basic procedure in steps 7 through 9 to check the rest of the pathways crosspoints A2 through A12 of the row Connect the Model 617 to ROW Band repeat the ba sic procedure in steps 7 through 10 to check crosspoints B1 through B12 Repeat the basic procedure in step 11 to check ROWS C D and To check differential offset current connect the Model 617 to ROW A as shown in Figure 4 4 and re peat steps 5 through 12 SECTION 4 Service Information Model 7025 Unterminated Triax Cable MODEL 617 ee a Note Setup shown is configured to test Row A pathways for offset current Model 7076 Figure 4 3 Mode Offset Current Testing SECTION 4 Service Information Figure 4 4 4 4 6 Model 7025 Unterminated Triax Cable MODEL 617 Measure Current Note Setup shown is configured to test Row A pathways for offset current Differential Offset Current Testing Contact Potential Tests These tests check the EMF generated by each relay con tact pair H and G for each pathway The tests simply consist of using a nanovoltmeter Model 181 to measure the contact potential Perform the following procedure to check contact poten tial of each path 1 2 3 Turn the Model 707 off if it is on On the matrix card remove the column jumpers if they are installed Inst
44. dling the matrix card Do not store or operate the card in an environment where dust could settle on the circuit board Use dry nitrogen gas to clean dust off the card if necessary Handle the card only by the handle and side edges Do not touch any board surfaces components or edge con nectors Do nottouch areas adjacent to electrical contacts When servicing the card wear clean cotton gloves If making solder repairs on the circuit board use a flux that is rosin RMA based Remove the flux from these ar eas when the repair is complete Use Freon TMS or TE or the equivalent along with plenty of clean cotton swabs to remove the Take care not to spread the flux to other areas of the circuit board Once the flux has been re moved swab only the repaired area with methanol then blow dry the board with dry nitrogen gas After cleaning the card should be placed in a 50 C low humidity environment for several hours 4 3 RELAY TEST PROGRAM SET UP The Model 707 comes equipped with a test program on disk that willtest the relays of all Model 7076s installed in the mainframe The test program will flag any relay that fails to close when energized or open when de energized Instructions for using the test program with an IBM PC or XT or HP 200 or 300 series computer are contained in the Model 707 Instruction Manual Perform the following steps to configure the Mcdel 7076 for relay testing 1 Remove the relay test termi
45. e 2 4 Model 7076 Configured as 4 x 24 Matrix sei y se nne ONE MTN HW Dee Figure 2 5 Model 7076 Configured as 8 x 12 Matrix Figure 2 6 Column Jumper Installation rau x pan ARAS esse Figure 2 7 Single ended Switching Example Using 7075 MTC Cable Figure 2 8 Differential Switching Example Using High Isolation Figure 2 9 Driven Guard Example Using High Isolation Cables Figure 2 10 Sensing Example Using High Isolation Figure 2 11 D sub Receptacle Contact Assignments Figure 2 12 Model 7075 MTC Standard NW bin Ka eek ea OD an Figure 2 13 D sub Plug Pin Assignments for High Isolation Cables Figure 2 14 Schematic Drawing of Backplane Jumper Configuration Factory Default Figure 2 15 Narrow Matrix Example 4 X 72 RY YH DU Figure 2 16 Dual x 72 iio ies va cane dA FOR ROF YN RR Figure 2 17 Wide Matrix Example 8 X36 Figure 2 18 Partial Matrix Expansion 8X 36 Figure 2 19 Single Card System Examples sao
46. e Model 7075 is configured as a quad 1 x 24 multiplexer In this test sys tem the matrix card provides 24 columns for DUT or ad ditional instrumentation By using the multiplexer card in the system 96 additional test lines are made available 2 22 Different bank jumper backplane jumper combinations on the Model 7075 can provide different pin outs for the same quad 1 24 multiplexer configuration Also differ ent multiplexer configurations are easily accomplished For example refer to Figure 2 22 removing backplane jumpers for rows C and F and installing bank jumpers B to C and F to G will configure the card as a dual 1 x 48 multiplexer SECTION 2 Operation Rows shorting plug connecting Row to Row Row B to Row F Row C to Row G Row D to Row H Test Fixture instrument Matrix Cables Columns 7075 MTC Cables 7076 CMTC Cables Rows 7075 MTC Cables or 7076 RMTC Cables BREE Instruments Simplified Equivalent Circuit Figure 2 21 Multiple Mainframe Example 2 23 SECTION 2 Operation CXL e se 9207 se 0 0 9 07 5101 Seuri ya seu yg 9202 Cae ee en eed Y Mn IN eae rae lau 2s 21 aW T au et 5 V 0IL 3 seo 0
47. e guard signal paths Thebackplane row jumpers are shown in Figure 2 3 and Figure 2 14 They have circuit designations W125 through W140 The odd circuit designations W125 W127 W129 W131 W133 W135 W137 and W139 identify the guard jump ers of the card These jumpers connect the Guard signal paths of the card to the guard backplane terminals of the Model 707 Adjacent to each HI jumper identified by the even circuit designations are holes in the pc board to ac 2 15 SECTION 2 Operation commodate a jumper By moving the guard jumpers to these locations the matrix card guard paths will connect to the low backplane terminals of the Model 707 WARNING Internal modifications to the matrix card should only be performed by qualified serv Model 7076 ice personnel who are familiar with standard safety precautions CAUTION Solder operations require that the pc board be cleaned as explained in paragraph 4 2 H three pole general purpose backplane of Model 707 Figure 2 14 Schematic Drawing of Backplane Jumper Configuration Factory Default 2 16 SECTION 2 Operation 272 Narrow Matrix Expansion An example of a narrow matrix is shown in Figure 2 15 This 4 x 72 matrix is configured by simply installing three as shipped Model 7076s in the Model 707 mainframe Rows A B C and D are connected to rows E F G and H externally These connections can be made at the instru mentation as shown in the il
48. er output U100 through U113 is low connected to digital common A driver output is low when a high data bit is clocked into it i e inverting drivers 4 5 3 Power Up Safeguard To prevent relays from inadvertently energizing and causing possible damage during power up a safeguard circuit has been incorporated into the design The protec tion circuit is comprised of a dual NAND gate U129 configured as a SET RESET flip flop and an RC network R102 C122 and CR101 The time constant of the RC net work keeps the output of the NAND gate low during the power up seguence This low signal is applied to the OE input of the shift registers keeping the relays de ener gized After the capacitor of the RC network charges a STROBE signal will then force the output of the NAND gate high allowing configured relays to energize XXX Ko Am Ao XI 9 ID Data Timing Diagram Figure 4 9 4 12 4 6 SPECIAL HANDLING OF STATIC SENSITIVE DEVICES CMOS and other high impedance devices are subject to possible static discharge damage because of the high im pedance levels involved The following precautions per tain specifically to static sensitive devices However since many devices in the Model 7076 are static sensitive it is recommended that they all be treated as static sensi tive 1 Such devices should be transported and handled only in containers specially designed to prevent or dissipate static build up Typ
49. erial The con ductive side of the foil and drain wire of each wire pair must be electrically isolated from the other wire pairs 2 13 SECTION 2 Operation High Gd Guard Row A Gd e Col 1 Gd Row A HI Col 1 HI Col 2 Gd Row B Gd Col 2 Row B HI Col 3 Gd Col 3 HI Row Gd Col 4 Gd Row C HI Col 4 HI Col 5 Gd Row D Gd Col 5 HI Row D HI Col 6 Gd Col 6 HI Row E Gd Col 7 Gd Note View from mating end of plug Col 7 HI Row F Gd Col 8 HI Row F HI e Col 9 Gd Col 9 HI Row G Gd 10 Gd Row Col 10 HI Row Col 8 Gd Col 11 Gd Row H Gd Col 11 HI Row Col 12 Gd Col 12 HI Note Uniabled pins not connected to cable A ROWS Cable Plugs B COLUMNS Cable Plugs Model 7076 RMTC Model 7076 Figure 2 13 D sub Plug Pin Assignments for High Isolation Cables 2 14 SECTION 2 Operation Table 2 5 Model 7076 RMTC Conductor Identification Matrix Row Cable Wire Color Combination Brown Red Foil w Drain Guard Red Red Foil w Drain Guard Orange HI Red Foil w Drain Guard Yellow Red Foil w Drain Guard Blue Red Foil w Drain Guard White HI Red Foil w Drain Guard Brown HI Blue Foil w Drain Guard Red HD Blue Foil w Drain Guard Black Chassis Red Foil w Drain Chassis White Chassis Blue Foil w Drain Chassis Chassis Main outer shield w Drain Chassi
50. error introduced into the measurement will be minimal Minimum input imped ance requirements are of course determined by the ac curacy needed in the measurement The input imped ances of the Model 196 are as follows 300mV and 3V ranges 150 30V range 11 300V range 10 1 For better input impedance requirements the Keithley 3 4 Model 617 Electrometer can be incorporated into the test system to measure voltage Another factor to be considered when checking low volt age dividers is thermal EMFs generated by the matrix card A matrix card crosspoint can generate up to 5LLV of thermal EMF Thus when making low voltage measure ments be sure to account for this additional error Even though four terminal connections are made at the Model 196 and the resistor networks the sense leads are internally disconnected from the input of the DMM when the volts function is selected The simplified test system is shown in Figure 3 3 The thick film is tested by applying a voltage across the resistor network and measuring the voltage across each resistor element and or across combined elements In Figure 3 3 crosspoints and D4 are closed to apply voltage across the network and crosspoints A3 and B4 are closed to measure the voltage drop across R3 SECTION 3 Applications Thick Film Model 196 Measure V Sense WEN Sense Commod pr EAS Model 7076 H3 Model 230 Source V 230 Equivalent Circuit
51. fects of matrix card path resistance lt 1 5 and the resistance of external cabling Whenever path resistance is a consid eration sensing should be used The standard cable Model 7075 MTC can also be used however the high paths in the cable will not be sur rounded by guard Columns 4 System Common Earth Ground Driven Guard Example Using High Isolation Cables Columns 2 9 SECTION 2 Operation 2 6 CONNECTIONS CAUTION To prevent damage not covered by the war ranty and a possible safety hazard do not exceed the maximum allowable limits of the Model 7076 Maximum signal levels are listed in the specifications located at the front of the manual As shipped all rows and columns of the Model 7076 ma trix card are connected to the three 25 pin D sub recepta cles mounted on the rear panel of the matrix card One re ceptacle is provided for row connections and two recep tacles are provided for column connections The COL UMNS receptacle located near the top is for rows A through D while the other COLUMNS receptacle is for rows E through H Col 1 Gd Col 1 HI to Col 2 Gd Col 2 HI Col 3 Gd o o Col 3 HI 6 6 6 6 M Col 4 Gd Col 4 Hi Col 5 Gd Col 5 m Col 6 Gd Col 6 HI Col 7 Gd Col 7 HI Col 8 Gd Col 8 HI Col 9 Gd Col 9 HI Col 10 Gd Col 10 HI Col 11 Gd Col 11 Ht
52. g carton 1 7 3 Instruction Manual The Model 7076 Instruction Manual is three hole drilled so that it can be added to the three ring binder of the Model 707 Switching Matrix Instruction Manual After removing the plastic wrapping place the manual in the binder after the mainframe instruction manual Note that a manual identification tab is included and should pre cede the matrix card instruction manual If an additional instruction manual is required order the manual package Keithley part number 7076 901 00 The manual package includes an instruction manual and any applicable addenda 1 2 1 8 REPACKING FOR SHIPMENT Should it become necessary to return the Model 7076 for repair carefully pack the unit in its original packing car ton or the equivalent and include the following informa tion Advise as to the warranty status of the matrix card Write ATTENTION REPAIR DEPARTMENT on the shipping label Filloutand include the service form located at the back of this manual 1 9 OPTIONAL ACCESSORIES The following accessories are available for use with the Model 7076 Model 7075 MTC Standard Row Column Cable Assembly The Model 7075 MTC is a three meter 10 feet 24 con ductor cable terminated with a 25 pin D subminiature D sub connector on both ends This cable connects to either the ROWS or COLUMN receptacles on the rear panel of the card This cable assembly is constructed us ing a general purpose flat
53. he rows of the matrix card to the mainframe backplane There is another set of backplane jumpers that must be considered when building larger matrices through rows This set of backplane jumpers is located in the Model 707 mainframe With these mainframe backplane jumpers in stalled the rows of all mainframe slots are connected to gether With these jumpers removed the rows of main frame slots 1 2 and 3 are isolated from the rows of main frame slots 4 5 and 6 NOTE The Model 707 is shipped with its backplane row jumpers installed Some configurations require that these backplane row jumpers be removed The procedure to remove these jumpers be found in the Model 707 In struction Manual Backplane Compatibility Considerations The Model 7076 may be incompatible with other card types when expansion is done through the backplane For example in a particular test system it may be neces sary to connect Guard of the Model 7076 which is a two pole card to Low of a three pole card As shipped the Model 7076 backplane row jumpers connect the Guard signal paths to the Guard terminals of the three pole gen eral purpose backplane of the Model 707 mainframe The Low signal paths of the other card are connected to the Low backplane terminals of the Model 707 With this con figuration Guard of the Model 7076 cannot be routed to Low of the other card The Model 7076 provides some flexibility in altering the backplane route of th
54. hrough crosspoints A1through A12 D HHHH Figure 4 2 Path Resistance Testing mended that the physical connections be made at columns 1 and 12 18 Connect OHMS LO and OHMS SENSE LO to the high H terminal of ROW E 19 Repeat the basic procedure of steps 9 through 15 to test the paths of rows and H 4 4 5 Offset Current Tests These tests check leakage current from high HI to guard differential and from high and guard to chassis common mode for each pathway In general these tests are performed by simply measuring the leak age current with an electrometer In the following proce dure the Model 617 is used to measure leakage current Referring to Figure 4 3 perform the following procedure to check offset current 1 Turn the Model 707 off if it is on 2 On the matrix card remove the column jumpers if they are installed Model 7076 10 11 12 13 Install the matrix card in slot 1 of the Model 707 Connect the Model 617 electrometer to ROW A of the matrix card as shown in Figure 4 3 On the Model 617 select the 200pA range and en able zero check and zero correct in that order Leave zero correct enabled for the entire procedure Turn on the Model 707 Program the Model 707 to close crosspoint A1 Onthe Model 617 disable zero check and verify that it is lt 100pA This measurement is the leakage cur rent of the pathway On the Mo
55. ically these devices will be received in anti static containers made of plastic or foam Keep these parts in their original containers until ready for installation 2 Remove the devices from their protective containers only at a properly grounded workstation Also ground yourself with a suitable wrist strap while working with these devices 3 Handle the devices only by the body do not touch the pins 4 Any printed circuit board into which the device is to be inserted must first be grounded to the bench or ta ble 5 Use only anti static type de soldering tools and grounded tip soldering irons 47 TROUBLESHOOTING The Keithley Model 7070 Universal Adapter Card is an extender card that allows access to circuit components of the Model 7076 during troubleshooting Also Figure 4 9 which provides receptacle contact identification is in cluded as a troubleshooting aid 471 Recommended Equipment Table 4 4 summarizes the equipment necessary for gen eral troubleshooting SECTION 4 Service Information Table 4 4 Recommended Troubleshooting Equipment Application DMM Keithley 196 Measure dc voltage Dual trace triggered sweep Check clock and oscilloscope dc to 50MHz logic pulses Extender card Keithley 7070 Allow circuit access 4 72 Troubleshooting Procedure In order to service the matrix card it may be necessary to remove the bottom shield The bottom shield is secured to the matrix card by eight
56. ints must be closed in order to connect a source to a Model 7076 1 column 2 7 5 Mainframe Matrix Expansion Matrices using up to 30 matrix cards are possible by daisy chaining five Model 707 mainframes together Us ing 30 Model 7076 matrix cards provides 2880 crosspoints In general assuming all backplane jumpers are installed connecting the rows of a card in one mainframe to the rows of a card in a second mainframe increases the col umn numbers of the matrix For example if the rows of a 4 x 120 matrix one mainframe are connected to the rows of a 4 72 matrix in a second mainframe the result ing matrix would be 4 x 192 See the Model 707 Instruc tion Manual for detailed information on daisy chaining Model 707 mainframes 2 19 SECTION 2 Operation Rows connected together at instrumentation Measure Instruments 7076 1 Backplane Jumpers Cut Matrix Configuration 7076 1 Backplane Jumpers 13 COL 24 14411 II I CARS ISLES Installed Column Jumpers installed Source Instruments E A I I ett rs I I e II I L ILLI III II 9III III IIIIII 5 I I I instruments Instruments B Equivalent Circuit Figure 2 18 Partial Matrix Expansion 8 x36 2 8 TYPICAL CONNECTION SCHEMES The following information provides some typical con nection schemes for single card multiple card and multi ple mainfr
57. ith a 25 pin D sub plug to the matrix card 1 Install the matrix card in the Model 707 mainframe as Pin designations on the D sub plugs of the standard cable explained in paragraph 2 3 correspond to the contact designations on the D sub re 2 Push the plug of the cable onto the appropriate re ceptacles of the matrix card Thus if connecting the stan ceptacle of the matrix card The cable plug and ma dard cable to a COLUMNS receptacle refer to trix card receptacle will only mate one way Figure 2 11A for column identification If connecting the 3 Tighten the screws of the plug housing to secure it to standard cable to the ROWS receptacle refer to the panel Figure 2 11B for row identification 2 11 SECTION 2 Operation 24 Conductor Flat Ribbon Cable located inside shieided round cable casing ea 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Plug Figure 2 12 Model 7075 MTC Standard Cable To connect the matrix to instrumentation and DUT a test fixture using a D sub receptacle can be used to mate to the D sub plug of the cable The Keithley part number for the D sub receptacle is listed in Table 2 3 Modifying the Standard Cable A common way to use the standard cable is to cut it at a convenient length The result is two cables that are unter minated at one end The flat ribbon cables at the unter minated ends of the cables can then be connected to in 2 12 Red Tr
58. lm Testing uses the Model 7076 as a 4 x 24 matrix and the second application Tran sistor Testing uses the card as an 8 x 12 matrix 3 2 THICK FILM RESISTOR NETWORK TESTING A dedicated matrix system for testing thick film resistor networks is shown in Figure 3 1 This particular system provides two different methods to check thick films four wire resistance measurements and voltage meas urements using an applied voltage The Model 7076 used in this system is configured as a 4 x 24 matrix The system shown in Figure 3 11 tests six 3 element thick films but can be expanded to test more by simply using additional Model 7076 matrix cards The Model 707 will accommodate six matrix cards Daisy chaining five Model 707s expands the system to 30 matrix cards allow ing 180 three element thick films to be tested SECTION 3 lications Model 7076 4X24 Matrix 2 Ex YI SML Qui Source V Model 230 Figure 3 1 Thick Film Resistor Network Testing 3 2 SECTION 3 Applications 3 2 1 Four terminal Ohms Measure ments For general purpose testing the Keithley Model 196 can be used to make four terminal resistance measurements of each thick film As shown in Figure 3 2 OHMS HI and OHMS SENSE HI are connected to one matrix row and OHMS LO and OHMS SENSE LO are connected to an other matrix row With this configuration the resistance of each resistor element and or combined elemen
59. lumn cables that will connect directly to DUT 2 82 Multiple Card System Figure 2 209 shows a system using two matrix cards In this configuration both instrumentation and DUT are connected to the columns of the matrix In this example the instruments are connected to the columns because they require six pathways The matrix as configured has only four rows Notice that the row jumper connections required to con figure the four row matrix are done at a 25 pin D sub plug 28 3 Multiple Mainframe System Figure 2 21 shows a system using seven matrix cards re quiring two Model 707s daisy chained together In this configuration DUTs are connected to matrix card col umns A single cable is used to connect the rows of the master mainframe to the rows of the slave mainframe Note that if path resistance is a critical factor use a modi fied or custom cable that is as short as possible 2 21 SECTION 2 Operation 7076 7076 7075 or 7076 CMTC DUT s A a ree eee 1 Model 707 Rows shorting plug connecting Row A to Row E Row B to Row F Row C to Row G Row D to Row H Simplified Equivalent Circuit Figure 2 20 Multiple Card System Example 2 8 4 Matrix Multiplexer System Figure 2 22 shows an example of how the Model 7076 can be used along with a multiplexer card Keithley Model 7075 in the same test system In this example the Model 7076 is configured as a 4 x 24 matrix and th
60. lustration or with custom built cable that shorts rows A to E B to C to G and D to H This example assumes that the mainframe backplane jumpers are installed Every additional Model 7076 in stalled in the mainframe would add 24 columns to the matrix For example four Model 7076s installed in the mainframe would result in a 4 x 96 matrix Table 2 7 sum marizes the narrow four rows matrix possibilities for a single Model 707 mainframe Model 7076 matrix cards installed in slots 1 2 and 3 of the Model707 can be electrically isolated from slots 4 5 and 6 Rows Connected together at Instruments 5 instrumentati tation E T4 CL Row C 1 Mode 7076 Backplane Jumpers Installed Mainframe Backplane Jumpers installed Figure 2 15 Narrow Matrix Example 4 x 72 LL LI Table 2 7 Narrow Matrix Expansion Installed Matrix Card Resulting Matrix 1 Card 2 Cards 3 Cards 4 Cards 5 Cards 6 Cards Mainframe backplane row jumpers between slots 3 and 4 of main frame must be installed for a matrix larger than 72 columns by removing the mainframe backplane row jumpers With the jumpers removed the Model 707 can accommo date two complete separate matrices using Model 7076 matrix cards see Figure 2 16 COL 36 sa E LI IL LL 22 LLL II _ 13 24 25 36 7076 7076 Slot 2 Slot 3 2 17 SECTION 2 Operation 1 COL al
61. ments referenced to digital common W153 W149 through W158 are jumpers located on pc board See Component Location drawing at end of Section 5 for jumper locations Figure 4 8 4 14 SECTION 5 Replaceable Parts 51 INTRODUCTION This section contains a list of replaceable parts for the Model 7076 as well as a component layout drawing and schematic diagram of the matrix card 5 2 PARTS LIST Replaceable parts are listed in the Model 7076 Parts List Electrical parts are listed in order of circuit designation 5 3 ORDERING INFORMATION To place an order or to obtain information concerning re placement parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following informa tion Matrix card model number 7076 Card serial number Part description Circuit description if applicable Keithley Part number 54 FACTORY SERVICE If the matrix card is to be returned to Keithley Instrument for repair perform the following 1 Complete the service form at the back of this manual and include it with the card 2 Carefully pack the card in the original packing car ton 3 Write ATTENTION REPAIR DEPARTMENT on the shipping label NOTE It is not necessary to return the matrix main frame with the card 5 5 COMPONENT LAYOUT AND SCHEMATIC DIAGRAM The component layout and schematic diagram of the Model
62. minals of ma i trix columns 1 12 together to form one common ter unit 5 minal 5 Set the Model 196 to the 300mV range and connect NOTE four test leads to the OHMS and OHMS SENSE in Do not use the Model 7070 Universal Adapter put Card as an extender card to verify perform 6 Shortthe four testleads together and zero the Model ance of the Model 7076 The Model 7076 must 196 Leave zero enabled for the entire test be installed in the Model 707 mainframe 7 Connect OHMS HI and OHMS SENSE HI of the Model 196 to the common terminal It is recom mended that the phys cal connections be made at i columns 1 and 12 as shown in the illustration 443 Matrix Card Connections 8 Connect OHMS LO and OHMS SENSE LO to the high H terminal of ROW by 25 RD 9 Turn on the Model 707 and program it to close Sub plugs and then mating it to the appropriate recepta hax DRM n lt 1 cle of the card Row and column shorting connections can 10 Open crosspoint A1 and close A2 Verify that the re also be done at D sub plugs Table 2 3 lists the Keithley art number for the D sub plug Pin identification for the O MAS parti S LoL ided by Fi TU 11 Open crosspoint A2 and close A3 Verify that the re pug is provi sistance of this path is lt 1 5Q 12 Repeat the basic procedure of opening and closing gt crosspoints to check the resistance of ROW high Bs one my De idee eye terminal
63. nal block from the rear panel of the Model 707 This is a quick disconnect terminal block and simply pulls off the rear panel terminal strip 2 Connect the relay test terminal block torows A and B of any Model 7076 card installed in the mainframe as shown in Figure 4 1 Note that terminals 5 and 6 of the relay test terminal block must be shorted to gether Terminals H and G of row B of the Model 7076 must also be shorted together NOTE A convenient method to make connections to the matrix card is by hard wiring a 25 pin D sub plug and then mating it to the ROWS re ceptacle of the card Table 2 3 lists the Keithley part number for the D sub plug Pin identifi cation for the plug is provided by Figure 2 13 SECTION 4 Service Information Figure 4 1 Relay Test Setup 3 Re install the relay test terminal block into the rear panel of the Model 707 mainframe and refer to the Model 707 Instruction Manual to run the test pro gram 4 4 PERFORMANCE VERIFICATION The following paragraphs discuss performance verifica tion procedures for the Model 7076 including path resis tance offset current contact potential and isolation The procedures in this section are rather lengthy due to the large number of row and column combinations that are checked As an alternative to this extensive testing it may be desirable to check only those paths that are going to be used or those that are suspected of being faulty With the Model
64. nd Row D C8 and D9 Row C and Row D C9 and D10 Row C and Row D C10 and D11 Row C and Row D C11 and D12 Row D and Row E None Row E and Row and F2 Row F and Row G F2 and G3 Row G and Row H G3 and H4 Row and Row G4 and H5 Row and Row H G5 and H6 Row G and Row H G6 and H7 Row G and Row H G7 and H8 Row G and Row H G8 and H9 Row G9 and H10 Row Gand H 10 WARNING G11 and H12 SECTION 4 Service Information The following steps use high voltage 100V Be sure to remove power from the circuit be fore making connection changes high and guard to chassis common mode of every row and column In general the test is performed by applying a voltage 100V across the terminals and then measuring the leakage current The isolation resistance is then calcu lated as R V I In the following procedure the Model 617 functions as a voltage source and an ammeter In the function the Model 617 internally calculates the re sistance from the known voltage and current levels and displays the resistance value Turn the Model 707 off if it is on Remove the matrix card column jumpers if installed Install the Model 7076 in slot 1 of the Model 707 Connect the Model 617 to ROW A as shownin Figure 4 7 to measure differential isolation Make sure The voltage source is in standby Also make sure there are no other connections to the card 10
65. ng switching configuration is shown in Figure 2 8 The advantage of using this con figuration is that the terminals of the source or measure instrument are not confined to the same matrix crosspoint Each terminal of the instrument can be nected to any matrix crosspoint The guard terminals of the matrix card are used as a shield Hat Shield Columns System Common gt Earth Ground Differential Switching Example Using High Isolation Cables SECTION 2 Operation 2 5 3 Guarding Figure 2 9 shows how the matrix card can be used witha driven guard Since the driven guard is at virtually the same potential as signal high protection from possible hazardous voltages up to 175V peak must be provided Many instruments have the capability of configuring their input or output such that a driven guard is placed on the inner shield of a triax connector The outer shield connected to system common provides protection from the guard voltage When making connections from the matrix card to the DUT a safety shield may be required depending on the type of connectors used Source or Measure Figure 2 9 Sense HI Source HI Sense LO Source LO Source or Measure Figure 2 10 Sensing Example Using High Isolation Cables 2 5 4 Sensing Figure 2 100 shows how the matrix card can be config ured to use instruments that have sensing capability The main advantage of using sensing is to cancel the ef
66. ng the matrix card from the mainframe 2 Connecting or disconnecting cables from the matrix card The pins of cable connectors are easily accessible making them extremely hazardous to handle while power is applied 3 Making internal changes to the card such as removing or installing jumpers Exercise extreme caution when a shock hazard is present at the test fixture User supplied lethal voltages may be present on the fixture or the connector jacks The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS or 42 4V peak are present A good safety is to expect that hazardous voltage is present in any unknown circuit before measuring Do not connect the card or any other instrumentation to humans Inspect the connecting cables and test leads for possible wear cracks or breaks before each use For maximum safety do not touch the test fixture test cables or any instruments while power is applied to the circuit under test Do not touch any object which could provide a current path to the common side of the circuit under test or power line earth ground Do not exceed the maximum signal levels of the test fixture as defined in the specifications and operation section of this manual Do not connect the matrix card directly to unlimited power circuits This product is intended to be used with impedance limited sources NEVER connect the matrix card directly to ac main
67. nt base bias currents For example Figure 3 6 shows the characteristics of a typical NPN silicon transistor at base bias currents I of 20mA 40mA 60mA and 80mA Model 196 _ _ _ M 224 Figure 3 4 Transistor Testing 3 6 Model 7076 Matrix Card SECTION 3 Applications Gain Equivalent Circuit 19 Volts Model 196 Output G Model 7076 Source Installed column jumpers between rows D and E shown in Figure 3 4 So are not shown in this illustration Model 224 Figure 3 5 Transistor Current Gain Checks SECTION 3 Applications Peer Ae EU EY Vcg volts Figure 3 6 Emitter Characteristics of an NPN Silicon Transistor 3 3 2 le and Measurements emitter current and base to emitter voltage Notice that external connection changes are not required All connec tion changes are accomplished by control of matrix The versatility of using a matrix is demonstrated in crosspoints In this situation care must be taken to pre Figure 3 7 and Figure 3 8 The transistor is still config vent crosspoints of rows B and D from being closed at the ured as common emitter amplifier but the Model 196 is same time removed from the collector circuit and used to measure 3 8 SECTION 3 Applications Hey 8 Volts HI Measure rr 22
68. press to cancel offset current and then enable zero check On the Model 617 set the voltage source for 100V and select the 20nA current range Make sure the voltage source is in standby Place the Model 617 in the V I measurement func tion by pressing SHIFT OHMS Turn on the Model 707 and program it to close crosspoints A1 ROW A COLUMN 1 and B2 ROW B COLUMN 2 SECTION4 _ Service Information Figure 4 6 11 12 13 14 15 4 8 Model 617 Unterminated ana Cables Note Setup shown is configured to test isolation row A column 1 and row B column 2 Path Isolation Testing Guarded On the Model 617 disable zero check and press OP ERATE to source 100V After allowing the reading on the Model 617 to settle verify that itis gt 10GQ This measurement is the leak age resistance isolation between ROW A COL UMN 1 and ROW COLUMN 2 Place the Model 617 in standby and enable zero check Turn off the Model 707 Disconnect the Model 617 from ROWS A and B and in a similar manner reconnect it to ROWS B and C 16 17 18 19 Model 7076 picoammeter high and voltage source low to ROW B and voltage source high and low to ROW C Turn on the Model 707 and program it to close crosspoints B2 and C3 On the Model 617 disable zero check and press OP ERATE to source 100V After allowing the reading on the Model 617 to settle verify that it is gt 10GQ Using Table 4 2
69. r of this instruction manual Should your Model 7076 re quire warranty service contact the Keithley representa tive or authorized repair facility in your area for further information When returning the matrix card for repair be sure to fill out and include the service form at the back of this manual in order to provide the repair facility with the necessary information 1 4 MANUAL ADDENDA Any improvements or changes concerning the matrix card or manual will be explained in an addendum in cluded with the unit Be sure to note these changes and incorporate them into the manual 1 5 SAFETY SYMBOLS AND TERMS The following symbols and terms may be found on an in strument or used in this manual symbol on an instrument indicates that the user should refer to the operating instructions located in the instruction manual The T ARE on an instrument shows that high voltage may be present on the terminal s Use standard safety precautions to avoid personal contact with these volt ages The WARNING heading used in this manual explains dangers that might result in personal injury or death Al ways read the associated information very carefully be fore performing the indicated procedure The CAUTION heading used in this manual explains hazards that could damagethe matrix card Such damage may invalidate the warranty The terms COLUMN COLUMNS ROW and ROWS are used in this manual as a reference to the rear panel re
70. rd Pin identification for this cable is shown in Figure 2 13B For connections to instrumentation and DUT a test fix ture using a D sub receptacles can be used to mate to the D sub plugs of the cables The Keithley part number for the D sub receptacle is listed in Table 2 3 Modifying the High Isolation Cable Another way to use the Model 7076 RMTC or Model 7076 CMTC is to cut the cable at a suitable length and add appropriate user termination Each cable can then be mated to the matrix card while the unterminated ends can be wired to another connector or directly to instru mentation and DUT Each cable contains 12 conductor pairs each of which cor responds to a row or column Each pair contains a color coded insulated wire HI and a bare drain wire Guard Each pair is wrapped in an insulated color coded foil which is also connected to Guard The color combination of the HI conductor insulator and the surrounding foil is used for identification Table 2 5 identifies the conduc tors of the Model 7076 RMTC cable while Table 2 6 pro vides identification for the Model 7076 CMTC cable Note that for both cables the black with red foil and white with blue foil pairs as well as the main outer shield are connected to chassis ground at the housing of the D Sub plugs CAUTION When terminating a cable that has been cut make sure that all exposed conductors are properly insulated using Teflon or PVC tubing and or heat shrink mat
71. rd 8 x 12 matrix by installing the column jump ers The location of the column jumpers on the PC board is shown in Figure 2 3 As shipped from the factory the 12 column jumpers sets are not installed Installing the 12 jumpers sets as shown in Figure 2 6 configures the Model 7076 as an 8 x 12 matrix With the Model 7076 backplane jumpers installed the 8 x 12 matrix is connected to the backplane of the Model 707 allowing matrix expansion see paragraph 2 7 With the backplane jumpers removed the 8 x 12 matrix will iso lated from any other card installed in the mainframe 2 7 SECTION 2 Operation SE RA S a Ar Su M c Co 1 Jumpers Not installed as shipped See Fig 2 3 for location of jumpers on PC board Installed Figure 2 6 Column Jumper Installation 2 5 TYPICAL MATRIX SWITCHING SCHEMES The following paragraphs describe some basic switching schemes that are possible with a two pole switching ma trix Source or Measure 7076 Single ended Switching Example Using 7075 MTC Cable Figure 2 7 Figure 2 8 2 8 2 5 1 Single ended Switching In the single ended switching configuration the source or measure instrument is connected to the DUT through a single pathway as shown in Figure 2 7 Note that the shield of the Model 7075 MTC cable is connected to the shield around the DUT 2 5 2 Differential Switching The differential or floati
72. rough 12 correspond to the columns receptacle labeled TO ROWS E H Note that even though there are 24 unique columns in this configuration the Model 707 recognizes only 12 col umns for programming purposes The crosspoint assign ments for the matrix card are provided in Figure 2 2B For example to connect r w A to column 10 the Model 707 would have to be programmed to close crosspoint 10 row A column 10 and to connect row to column 10 22nd column crosspoint E10 would have to be closed These crosspoint closures assume that the matrix card is installed in slot 1 of the mainframe The crosspoint assignments in Figure 2 2B are valid regardless of how the card is configured The column number assignments for programming the Model 707 are determined by the mainframe slot that the matrix card is installed in For example the column num ber assignments of a matrix card installed in slot 4 of the mainframe are numbered 37 through 48 Column num ber assignments for all six mainframe slots are listed in Table 2 1 Notice in Figure 2 2A that there are backplane jumpers located on the matrix card With the jumpers installed the matrix card is connected to the backplane of the Model 707 allowing matrix expansion see paragraph 2 7 With the jumpers removed the matrix card is iso lated from any other cards installed in the mainframe The physical location of these jumpers on the board is shown in Figure 2 3 SECTION
73. s Table 2 6 Model 7076 CMTC Conductor Identification Matrix Column Cable Wire Color Combination Brown Red Foil w Drain Guard Red Red Foil w Drain Guard Orange HI Red Foil w Drain Guard Yellow HI Red Foil w Drain Guard Blue Red Foil w Drain Guard White HI Red Foil w Drain Guard Brown Blue Foil w Drain Guard Red Blue Foil w Drain Guard Orange HD Blue Foil w Drain Guard Column 10 Yellow HD Blue Foil w Drain Guard Column 11 Blue HD Blue Foil w Drain Guard Column 12 Black HI Blue Foil w Drain Guard Chassis Black Chassis Red Foil w Drain Chassis White Chassis Blue Foil w Drain Chassis Main outer shield w Drain Chassis Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Column 8 Column 9 Chassis Chassis 2 7 MATRIX EXPANSION With the use of additional matrix cards larger matrices can be configured through the backplane of the Model 707 Thus unless otherwise noted the examples pro vided in the following paragraphs assume that the Model 7076 backplane jumpers are installed 2 7 1 Backplane Row Jumpers The easiest way to to accomplish matrix row expansion is through the backplane of the Model 707 mainframe It is through this mainframe backplane where row connec tions to other cards are made As previously explained in paragraph 2 4 the Model 7076 has eight sets of backplane jumpers that connect t
74. s When connecting sources install protective devices to limit fault current and voltage to the card The chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections Model 7076 Dual 4x12 Two Pole Matrix Card MATRIX CONFIGURATION Dual 4 rows by 12 columns Also configurable as 8 rows by 12 columns Jumpers can be removed to isolate any row from the backplane CROSSPOINT CONFIGURATION 2 pole Form A HI GUARD CONNECTOR TYPE 25 pin subminiature D connector two for column connection one for row connection MAXIMUM SIGNAL LEVEL DC Signals 110V DC switched 30VA resistive load AC Signals 175V AC peak 1A switched 62 5VA resistive load COMMON MODE VOLTAGE 110V DC 175V AC peak pin to pin or pin to chassis CONTACT LIFE Cold Switching 108 closures At Maximum Signal Level 105 closures PATH RESISTANCE per conductor lt 0 502 initial lt 1 59 at end of contact life CONTACT POTENTIAL lt 5pV per crosspoint HI to GUARD OFFSET CURRENT lt 100pA ISOLATION Path 210100 lt 7pF Differential gt 10 Q 120pF nominal Common Mode gt 1090 200pF nominal CROSSTALK 1MHz 500 load lt 504 INSERTION LOSS 1MHz 500 source 500 load 0 05dB typical 3dB BANDWIDTH 500 load 15MHz typical RELAY DRIVE CURRENT per crosspoint 28mA RELAY SETTLING TIME lt 3ms ENVIRONMENT Operating 0 to 50 C up to 35 C at 70 Storage 25 to 65
75. s most convenient such as at the connector of a custom ized cable assembly or at the instrumentation see Figure 2 15 or DUT test fixture In a multiple card system where backplane jumpers are left installed row jumpers are only required at one card Figure 2 4 Model 7076 Configured as 4 x 24 Matrix 2 6 Removing the backplane jumpers will isolate the 4 x 24 matrix from any other card installed in the mainframe Crosspoint assignments for programming the Model 707 do not change even though the matrix configuration of the card has changed see Figure 2 2B For example to connect row A to the 24th 12 column of the 4 x24 matrix see the equivalent circuit in Figure 2 4 the Model 707 would have to be programmed to close crosspoint E12 assuming the card is installed in slot 1 of the mainframe Table 2 2 provides the crosspoint assignments for a Model 7076 configured as a 4 24 matrix installed in slot 1 of the mainframe Table 2 1 provides the column number assignments for the other mainframe slots Backplane Jumpers Equivalent Circuit SECTION 2 Operation Table 2 2 4x24 Matrix Crosspoint Assignments Matrix Column 1 In the 4 X 24 matrix configuration Row is connected to Row Row is connected to Row Row to Row Row D Row H Figure 2 5 Model 7076 Configured as 8 x 12 Matrix 242 8x12 Matrix Figure 2 5 shows that the Model 7076 can be configured standa
76. screws Simply remove these screws and separate the shield from the pc board When reinstalling the shield make sure the shield is oriented such that the standoffs staked onto the shield are posi tioned between the pc board and the shield Table 4 5 outlines troubleshooting procedure for the ma trix card CAUTION Contamination will degrade the perform ance of the matrix card To avoid contamina t on always grasp the card by thehandle and side edges Do not touch the edge connectors of the card and do not touch the board sur faces or components On connectors do not touch areas adjacent to the electrical con tacts CAUTION If removing relays from the PC board care must be taken to prevent traces from being ripped off the board Using solder sucker make sure all solder is removed Each relay pin must move freely in the feed through hole Also make sure there are no burrs on the ends of the relay pins 4 13 SECTION 4 Service Information o N C N C Row A HI Col 1 Gd Row A Gd to Col 1 HI Coi 2 Gd Row A Gd h Col 2 HI Row B HI Col 3 HI Columns Row Gd 6 Col 3 Gd O 0 0 0 o Row B Gd Col 4 Gd A D Row C Gd Col 4 HI Row C HI Col 5 Gd Row C Gd Col 5 Hi Rows Row D Gd S As Col 6 Gd Row D HI Col 6 Hi Row D Gd Col 7 Gd Row E Gd Col 7 Row E HI gt
77. t of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user please describe Be sure to include your name and phone number this service form Keithley Instruments Inc 28775 Aurora Road Cleveland 44139 216 248 0400 Fax 216 248 6168 http www keithley com CHINA FRANCE GERMANY GREAT BRITAIN ITALY JAPAN NETHERLANDS SWITZERLAND TAIWAN Keithley Instruments China Yuan Chen Xin Building Room 705 No 12 Yumin Road Dewai Madian Beijing China 100029 8610 2022886 Fax 8610 2022892 Keithley Instruments SARL BP 60 3 all e des Garays 91122 Palaiscau C dex 31 6 0115155 Fax 31 6 0117726 Keithley Instruments GmbH Landsberger Stra e 65 82110 Germering 49 89 849307 0 Fax 49 89 84930759 Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 44 01734 575666 Fax 44 01734 596469 Keithley Instruments SRL Viale S Gimignano 38 20146 Milano 39 2 48303008 Fax 39 2 48302274 Keithley KK Aibido Bldg 7 20 2 Nishishinjuku Shinjuku ku Tokyo 160 81 3 5389 1964 Fax 81 3 5389 2068 Keithley Instruments BV Avclingen West 49 4202 MS Gorinchem 31 0 183 635333 Fax 31 0 183 630821 Keithley Instruments SA Kriesbachstrasse 4 8600 D
78. ts can be measured by closing the appropriate crosspoints In Model 196 196 Equivalent Circuit 4 Terminal Ohms Measurements Figure 3 2 Figure 3 2 crosspoints Al row A column 1 and B3 are closed to measure the combined resistance of R1 and R2 The effects of thermal EMFs generated by relay contacts and connections can be canceled by using the offset com pensated ohms feature of the Model 196 To compensate for thermal EMFs close two crosspoints such as A1 and B1 that will short the input of the Model 196 enable zero to cancel internal offset and then enable offset compen sated ohms Thick Film Model 7076 SECTION 3 Applications 3 2 2 Voltage Divider Checks For thick film resistor networks that are going to be used as voltage dividers it may be desirable to test them using voltages that simulate actual operating conditions This is a particularly useful test for resistor networks that have a voltage coefficient specification The test system in Figure 3 1 uses a Keithley Model 230 to source voltage and the Model 196 to measure voltage A consideration in these checks is the affect of the Model 196 input impedance on voltage measurements The in put impedance is shunted across the resistor being meas ured The resultant divider resistance is the parallel com bination of the resistor under test and the input imped ance As long as the input impedance is much larger than the resistor being tested the

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