Keithley 7076 Instruction Manual Download | Manualshive

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Summary of Contents for 7076

Page 1: ...Model 7076General 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...

Page 2: ...t apply to defects resulting from product modification without Keithley s express written consent or misuse of any product ot part This warranty also does not apply to fuses software non rechargeable...

Page 3: ...General Purpose Matrix Card Dual 4 x 12 Model 7076 Instruction Manual 01990 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Document Number 7076 901 01...

Page 4: ...All Keithley product names are trademarks or registered trademarks of Keithky Instruments Inc Other brand and product names are trademarks or registered trademarks of their respective holders...

Page 5: ...tandards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS or42 4V peak are present A good safety practice is to expect that hazardous voltage is present in any...

Page 6: ...to chassi CONTACT LIFE Cold Switching 10s closures At M Mm rn Signal Level 105closures PATH RESISTANCE per conductorb 0 5On initial 1 5R at end of contact life CONTACTPOTENTIAL 5pV per crosspaint HI l...

Page 7: ...3 Guarding 2 5 4 Sensing 2 6 CONNECTIONS 2 6 1 Standard Cable Model 7075 MTC 2 6 2 High Isolation Cables Model 7076 RMTC and Model 707 CMTC 2 7 MATRIXEXPANSION 2 7 1 Backplane Row Jumpers 2 7 2 Narro...

Page 8: ...ections Path Resistance Tests Offset Current Tests Contact Potential Tests Path Isolation Tests Differential and Common Mode Isolation Tests IWNCIPLES OF OPERATION Card Identification Switching Circui...

Page 9: ...umper Configuration Factory Default Narrow Matrix Example 4 x 72 Dual4x72Matrices WideMatrixExample 8x36 Partial Matrix Expansion 8 x 36 Single Card System Example Multiple Card System Example Multipl...

Page 10: ...0 Relay Test Setup 4 2 Path Resistance Testing 44 Common Mode Offset Current Testing 4 5 Differential Mode Offset Current Testing 4 6 Contact Potential Testing 4 7 Path Isolation Testing Guarded 4 8 D...

Page 11: ...le 2 5 Model 7076 RMTC Conductor Identification 2 15 Table 2 6 Model 7076 CMTC Conductor Identification 2 15 Table 2 7 Narrow Matrix Expansion 2 17 Table 2 8 Wide Matrix Expansion 2 19 SECTION 4 Servi...

Page 12: ...ements 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 AN...

Page 13: ...udes an instruction manual and any applicable addenda l 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...

Page 14: ...d 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 This cable...

Page 15: ...s 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 impe...

Page 16: ...ocedure 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 ma...

Page 17: ...e Figure 2 1 Matrix Card Installation Table 2 l Column Number Assignments 17076 Card Location 1 Matrix Column Numbers Slot 1 1 through 12 Slot 2 13 through 24 Slot 3 25 through 36 Slot 4 37 through 48...

Page 18: ...SECTION 2 r _ 1 A Simplified Schematic r 1 igure 2 2 Model 7076 2 4...

Page 19: ...SECTION 2 Oaeration I I 1 I I I 0 0 l Cigure 2 3 SimpIified Component layout...

Page 20: ...installed in the mainframe Crosspoint assignments for progmmming the Model 707 do not change even though the matrix configuration of the card has changed see Figure 2 28 For example to connectrowAtoth...

Page 21: ...ure 2 5 shows that the Model 7076 can be configured asastandard8 12matibyinstallingtbecolumnjump With the Model 7076 backplane jumpers installed the 8 x em The location of the column jumpers on the PC...

Page 22: ...igure 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 floating switching configuration is shown in Figur...

Page 23: ...from the matrix card to the DUT a safety shield may be required depending on the type of connectors used 2 5 4 Sensing Figure Z 100 shows how the matrix card can be config ured to use instruments tha...

Page 24: ...to the matrix card the standard cable Model 7075 MTC and high isolation cables Model 7076 RMTC and Model 7076 CMK Basically the stan dard cable is a general purpose cable that will mate to either the...

Page 25: ...YS remove power from the entire system Model 707 test in struments DUT etc and discharge any ca pacitors before connecting or disconnecting cables from the matrix card The pins of the cable connectors...

Page 26: ...ay to use the standard cable is to cut it at a convenient length The result is two cables that are unter tiated at one end The flat ribbon cables at the unter minated ends of the cables can then be co...

Page 27: ...e matrix card Pin identifi cation for this cable is shown in Figure 2 13A The Model 7076 CMTC is a 3 meter 10 feet 2 conduc tor cable terminated with a D Sub plug on each end The plug pin assignment f...

Page 28: ...0 c I Col4HI 21 8 l 2 Col5HI Cd 5 Gd RowDGd 7 2o RowDHI 7 l 2o Cal 6Gd RowEGd Col6HI 6 l Row EHI Note View from 16 5 l mating end of plug RowFGd 17 4 Row F HI RowGHI 3 l6 RowGGd 15 Note Unlabled pins...

Page 29: ...y explained in paragraph 2 4 the Mode17076 has eight sets of backplane jumpers that connect the rows of the matrix card to the mainframe backplane There is another set of backplane jumpers that must b...

Page 30: ...familiar with standard safety precautions WARNING CAUTION Internal modifications to the matrix card Solder operations require that the pc board should only be performed by qualified stxv be cleaned a...

Page 31: ...e mainframe would add 24 columns to the Mainframe backplane row jumpers between slots 3 and 4 of main matrix For example four Model 7076s installed in the frame must be installed for a matrix larger t...

Page 32: ...Model 7076s konfigured as 8 x 12 matrices installed in the Model 707will result in an 8 x 36 malxix An example of an 8 x 36 matrix is shown in With the column jumpers installed column 1 is con netted...

Page 33: ...ough H of the other matrixcard in the mainframe see Figure 2 188 An obvious advantage of a partial matrix is that fewer matrix cards are needed Another reason to use a partial matrix is to keep certai...

Page 34: ...how Model 7075 cables or Model 7076CMTC and Model 7076 WC cables In many in stances these cables are best utilized by cutting them in half Cutting them provides twice as many cables and al lows direct...

Page 35: ...stem using two matrix cards In this configuration both instrumentation and DUT are connected to the columns of the matrix In this example the inshuments are connected to the columns because they requi...

Page 36: ...plexer 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 Different...

Page 37: ...ows shorting plug RowAtoRowE RowBtoRowF I I Instrument Math Cables Columns 7075 MTC Cables or 7076imTc cables Row 7075MTC Cables or 7076RMTC Cables Simplified Equivalent Circuit Figure 2 21 Multiple M...

Page 38: ...SECTION 2 Operation r _ igure 2 22 Matrix Multiplexer System 2 24...

Page 39: ...crosspoint Al closed The 5OQ source is connected to ROW A and the 50 2load is connected to COLUMN 1 Figure 2 24 shows the 3dB bandwidth with crosspoint HI2 closed The 5OQ source is connected to ROW H...

Page 40: ...n Tgure 2 25 CrosstaNc Crosspoints Gl and H2 closed 50RsourceonROWG 50 loadonCOL UMNl MeasurementsatROWH Figure2 26 Crosstalk Crosspoints All and B12 closed 5OQsowce on ROW A 5OQ load onCOLUMNl1 Measu...

Page 41: ...TING A dedicated matrix system for testing thick film resistor networks is shown in Figure 3 l This particular system provides two different methods to check thick films four wire resistance measureme...

Page 42: ...SECTION 3 Measure V or 4 terminal R source v Model 7076 4X24 Matrix qurre3 1 Thick Film Resistor Network Testing 3 2...

Page 43: ...ted to an other matrix row With this configuration the resistance of each resistor element and or combined elements can be measured by closing the appropriate crosspoints In The effects of thermal EMF...

Page 44: ...e ac curacy needed in the measurement The input imped ances of the Model 196 are as follows 3OOmV and 3V ranges 1GQ 30V range 1lM Q 300V range 1O lM Q For better input impedance requirements the Keith...

Page 45: ...SECTION 3 Applications Thick Film r 1 I Ri R2 R3 I I Model 196 Measure V Model 7076 Sourcev 196 A 8 1 230 Equivalent Circuit Figure 3 3 Voltage Divider Checks 35...

Page 46: ...dc current gain of a general purpose transistor can be checked by configuring the transistor as a common emit ter amplifier Figure3 5 shows which crosspoints to close to configure the amplifier circui...

Page 47: ...cations Equivaknt Circuit A L_s I um lluI MadeI 7076 Note Installed column jumpers between rows D and E shown in Figure 3 4 are not shown in this illustration Model 224 Figure 3 5 Transistor Current G...

Page 48: ...transistor is still cotig ured as a common emitter amplifier but theMode 196 is removed from the collector circuit and used to measure emitter current and base tb emitter voltage Notice that external...

Page 49: ...SECTlON 3 Applications Volts HI Model 196 l H C AmpsHI ia H D AmpsLO IG I Model 230 Figure 3 7 Transistor IEMeasurements I Model 7076 3 9...

Page 50: ...App lications I II II II I output Model230 1 Model7076 Note installed column jumpers between rows D and E shown in Figure 34 are not shown in this illustration Model224 Ywre 3 8 Transistor V Measurme...

Page 51: ...s 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 flux Take care not to spread...

Page 52: ...edures 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...

Page 53: ...d zero the Model 196 Leave zero enabled for the entire test 7 Connect OHMS HI and OHMS SENSE HI of the Model 196 to the common terminal It is recom mended that the physical connections be made at colu...

Page 54: ...rent 9 On the Model 617 enable zero check and on the Model 707 open crosspoint Al 10 Repeat the basic procedure in steps 7 through 9 to check the rest of the pathways crosspoints A2 through A12 of the...

Page 55: ...SECTION 4 Service Information coIYnl Jumpers RmloVed I I I Model 7076 gure 4 3 Common Mode Offset Current T ins 4 5...

Page 56: ...nd press ZERO to null out internal offset Leave zero enabled for the entire procedure 6 Connect the Model 181 to a ROW A as shown in the illustration 7 Turn on the Model 707 8 Program the Model 707 to...

Page 57: ...it is on 2 Remove the matrix card column jumpers if installed 3 Install the Model 7076 in slot 1 of the Model 707 4 Connect the Model 617 to ROWS A and B as shown in Figure 4 6 Make sure The voltage...

Page 58: ...Turn off the Model 707 15 Disconnect the Model 617 from ROWS A and B and in a similar manner reconnect it to ROWS B and C picoammeter high and voltage source low to ROW B and voltage source high and l...

Page 59: ...from high and guard to chassis common mode of every row and column In general the test is performed by applying a voltage UOOV across the terminals and then measuring theleakagecurrent Theisolationres...

Page 60: ...showninFigure 4 8 and repeat steps 8 through 16 to check common mode isolation Table 4 3 Differential and Common Mode Isolation Test rest No 1 2 3 4 5 6 8 9 10 11 z 14 15 16 17 18 19 20 21 22 23 t 26...

Page 61: ...SECTION 4 Service Information Model 7076 Cigure 4 7 Differential Isolation Testing Figure 4 8 Common Mode Zsolntion Testing 411...

Page 62: ...shows the first byte of identification data during the transfer sequence For subsequent bytes the CLRADDR line stays low Matrix configuration data is sent from the Model 707 via the RELAY DATA contro...

Page 63: ...versal Adapter Card is an extender card that allows access to circuit componentsof the Model 7076 during troubleshooting Also Figure4 9 which provides receptacle contact identification is in cluded as...

Page 64: ...Comment Required Condition W152 6V supply 6V dc w155 w150 5v supply 5V dc CLR ADDR line High logic pulse at beginning of each card identification w151 byte transfer sequence upon power up NEXT ADDR li...

Page 65: ...nation and include it with the card 2 Carefully pack the card in the original packing car ton 5 3 ORDERING INFORMATION _ 3 Write ATTENTION REPAIR DEPARTMENT on the shipping label Toplaceanorder or to...

Page 66: ...RES lOK 5 l 4W COMPOSITION OR FILM RES 2CD 5 1 4W COMPOSITION OR FILM RES 47K 5 1 4W COMPOSITION OR FILM RES 1lK 5 1 4W COMPOSITION OR FILM RES 5 lK 5 i 4ti COMPOSITION GR FILM RES 120K 5 1 4W COMPOS...

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Page 71: ...articular range or function bad specify 0 Batteries and fuses are OK 0 Checked all cables 0 Calibration only 0 Data required 0 Certificate of calibration required attach any additional sheetsasnecessa...

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