Keithley 7074 Instruction Manual Download

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Summary of Contents for 7074

Page 1: ...Model 7074General Purpose Multiplexer Card Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 2: ...R ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS B...

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

Page 5: ...I O connections are for connection to Category I sources un less otherwise marked or described in the Manual Exercise extreme caution when a shock hazard is present Lethal voltage may be present on ca...

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

Page 7: ...c 55dB at IMHz 5OQ load INSERTION LOSS lMHz 5OS2source 5OQ load O ldB typical 3dB BANDWIDTH 50R load 1OMHz typical RELAY DRIVE CURRENT per relay 15mA RELAY SETTLING TIME 3msec ENVIRONMENT Operating 0...

Page 8: ...l 55dB at IMHz 5On load INSERTION LOSS lMHz 5OQ source 5OQ load O ldB typical 3dB BANDWIDTH 5OQ load 1OMHz typical RELAY DRIVE CURRENT per relay 5OmA RELAY SETTLING TIME 3msec ENVIRONMENT Operating 0...

Page 9: ...atrix ccw ers card signal paths and describes connections SECTION 2 Operation Gives typical applications for the Model 7074 SECTION 3 Applications Contains performance verification procedures troubles...

Page 10: ...ON 2 1 2 4 1 Rear Panel 2 1 2 4 2 1 12 Multiplexer Banks 2 2 2 4 3 Multiplexer Bank Jumpers 2 2 2 4 4 Backplane Connection Jumpers 2 7 2 4 5 Switching Con gurations 2 7 2 5 CARD INSTALLATION AND REMOV...

Page 11: ...Tests 3 6 3 3 3 Example Transistor Test Program 3 6 3 4 TESTING WITH MATRIX CARDS 3 7 3 4 1 Multiplexer and Matrix Card Connections 3 7 3 4 2 Resistivity Tests 3 7 3 4 3 Example Resistivity Test Prog...

Page 12: ...onnections 4 18 4 7 4 Troubleshooting Procedure 4 18 4 7 5 Relay Replacement Precautions 4 19 4 8 PRINCIPLES OF OPERATION 4 19 4 8 1 Block Diagram 4 19 4 8 2 ID Data Circuits 4 20 4 8 3 Relay Control...

Page 13: ...itching 4 Wire DMM Switching SMU Connections Model 7074 Installation Connections Using Mass Terminated Cables Connecting 75 I Plug to Bank Receptacle Connecting 38 Pin Plug to ROW Receptacle Connectin...

Page 14: ...y Test Configurations 3 8 Figure 3 8 Measurement Required for Resistivity Test 3 9 SECTION 4 Service Information Figure 4 l Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 7 Figure 4 8...

Page 15: ...Cable Color Codes SECTION 4 Service Information Table 4 l Recommended Verification Equipment Table 4 2 Performance Record Table 4 3 Path Isolation Test Summary Table 4 4 Differential and Common Mode...

Page 16: ...the 3 p general purpose backplane pathways with user installed jumpers allowing simple internal connections to the rows of those matrix cards Five mass termination receptacles located on the rear pan...

Page 17: ...can be added to the three ring binder of the Model 707 Switching Matrix Instruction Manual After 1 2 removing the plastic wrapping place the manual in the binder after the mainframe instruction manua...

Page 18: ...following accessories are intended for use with the ROW A H receptacle Model 707 CIT Contact Insertion and Extraction Tools The Model 7078 CIT includes an insertion tool that is used to insert wire cr...

Page 19: ...olm these procedures unless you are qualified to do so Carefully read the safety precautions located at the front of this manual before using the multiplexer card 2 2 HANDLING PRECAUTIONS To maintain...

Page 20: ...ssed below Note that inputs are also referred to as channels in this manual 2 4 3 Multiplexer Bank Jumpers Jumpers can be installed on the card in order to connect multiplexer banks together to form m...

Page 21: ...SECTION 2 Opr XI for all Channels Note Factory Configuration Shown Jumper installed at factory Jumper not installed at factory Figure 2 2 Model 7074 Multiplexer Organization Factmy Configuration 2 3...

Page 22: ...SECTION 2 Operation AlOB 0 Rear 0 Panel EbaF F OG GbH 0 Figure 2 3 Model 7074 Card Showing Jumper Locations Z 4...

Page 23: ...SECTION 2 Operation Figure 2 4 Eight 1 x 12 Multiplexer Configured No jumpers installed Figure 2 5 Four 2 x 24 Multiplexer Configuvntion 2 S...

Page 24: ...SECTION 2 Operarion gure 2 6 Two 1 x 48 Multiplexer Confi quration Tgure 2 7 1 x 96 Multiplexer Configuration 2 6...

Page 25: ...ack plane 2 4 5 Switching Configurations Guarded Switching Each multiplexer switch is a 3 p relay that switches HI LO and guard allowing 3 p switching an exam ple of which is shown in Figure 2 9 In th...

Page 26: ...split up into several multiplexers two or more multiplexer banks can be used together to add the desired number of poles Figure 2 11 shows an example for 4 wire resistance measurements using a DMM No...

Page 27: ...gure Z 11 4 Wire DMM Switching 236 SMU Warning Hazardous voltages up to 110 may be present on GUARD hs a l earth grounded sa ety shield and make sure al cable shields are properly insulated igure 2 12...

Page 28: ...onnecting cables before in stalling or removing the multiplexer card l Before installing the card make sure the access door on top of the Model 707 is fully closed and secured The access door contains...

Page 29: ...cables plugs re ceptacles and special tools are similar and are called out together Table 2 l summarizes the cables receptacles and special tools that canbe obtained directly from Keith ley Instrumen...

Page 30: ...Mass Terminated Receptacle 3 pin rack and panel receptacle and contact pins NOTE All Model 7074numbers pertain to BANK receptacles plugs All Model 7078numbers pertain to ROW receptacle plug 7074 MTC...

Page 31: ...ceptacle on the Direct Connections Figure 2 14 shows how these cables can be used to con nect inputs and outputs of the multiplexer card to exter nal rack and panel receptacles The external recepta cl...

Page 32: ...ing38 Pin Plug to RO WReceptacle 3 Using a screwdriver turn the locking screw s clock wise until the plug is fully mated to the receptacle for the BANK plugs both screws must be secured Disconnecting...

Page 33: ...are connected to Model 7074 chassis ground For example with the cable connected to the ROW A H receptacle of the multiplexer card Bank E can be identi fied by locating the bundle that has ablack insul...

Page 34: ...Green 7 Blue 21 Clear Red 36 Brown 24 Clear Red 3 Orange 17 Clear 70 Yellow 76 White 62 Clear 49 Black 43 Brown 55 Clear 73 White 79 Orange 65 Clear 52 Yellow 46 Black 58 Clear 71 Yellow 77 Blue 63 Cl...

Page 35: ...simpler to make your own cable because you would need only one paired cable instead of the eight provided by MTC cables The rack and panel plugs will mate to the receptacles on the multiplexer card in...

Page 36: ...e touse the slot labeled 20 24 on the tool 7 Insulate the locking screw of the plug with shrink tubing as shown in Figure Z 19 NOTE Figure2 20 shows where the wires of each ws wnere the wires of each...

Page 37: ...SECTION 2 Operation Terminal A c mar Bn Brown R Red BU BItA Bk Black Y Yellow G Green W White cl orange Plug Viewed from wiring side Figure 2 20 38 Pin Plug 7078 KIT Wire Color Coding 2 19...

Page 38: ...lug see Figure Z 21 1 Cut the cable to the desired length NOTE Refer to Figure 2 18 for cable preparation steps2through5 Thesestepsapply toallbun dies excent for the bundle with the brown and 1 white...

Page 39: ...ulate the locking screws of the plug with shrink tubing as shown in Figure 2 22 9 Orient the cable to the plug as shown in Figure 2 22 Using Figure 2 23 as a guide insert the wire crimp tails into the...

Page 40: ...housing on the plug body put the bushinginplace then tighten the cable clamp SCI WS around the bushing 12 Connect both sets of ground wires from steps 9 and 10 to the user installed ground screw on th...

Page 41: ...ge of the wire you are using 7 Insulate the locking screw of the plug with shrink tubing as shown in Figure Z 19 8 Using Figure 2 24 as a guide insert the wire crimp tails into the plug 9 Slide the ho...

Page 42: ...e insulation must have a ZOOV UL rating 5 Remove l 8 of insulation from each of the insu lated wires 6 Using the Model 7074 HCT crimping tool connect a wire crimp tail to each of the wires Be sure to...

Page 43: ...ROW A H cable plugs These receptacles provide a convenient way to connect the multiplexer card to test fixtures and instruments on your test setup Follow the general procedure below to connect wires...

Page 44: ...de 2 H HI L LO G GUARD 3 A refers to E k A also applies to Banks C E and G 4 B refers to Bank B also aDDlies to Banks D F and H 5 titimber input number e g Al2 Bank A input 12 WARNING Shaded dots indi...

Page 45: ...SECTION 2 Operation Rcw Receptacle Figure 2 27 ROW A H Receptacle Connector 2 27...

Page 46: ...ypical connections to a Model 7071 or 7071 4 General Figure 2 28 shows typical connections for a single multi plexer card system In this example the instruments are connected to the row outputs and th...

Page 47: ...pole general purpose backplane when appropriate backplane jumpers are in stalled Also you must install the bank jumpers for the desired bank configuration 2 7 3 Using the Multiplexer with Matrix Cards...

Page 48: ...SECTION 2 Operation A Connections B Simplified Equivalent Circuit Cigure 2 29 Multiple Card System Example 230...

Page 49: ...SECTION 2 Operarion I 1 00 c c r 0 o A Connections l 1 6 EquivalentCircuit we 2 30 Using the Multiplexer with n Model 7071 Matrix Card 2 31...

Page 50: ...SECTION 2 Operation 1 1 I 1 1 0 0 oo c l c II II A Connections eA B SimplifiedEquivalentCircuit Figure Z 31 Using the Multiplexer with a Model 70724 r 32...

Page 51: ...12 channels of a specific bank bank A in this example The program which is written in Hewlett Packard BASIC 4 0 incorporates a fixed delay of one second for settling time Typically code for the measu...

Page 52: ...e Z 32 For low to medium device resistance val ues path isolation resistance is seldom a consideration however it can seriously degrade measurement accu racy when testing high impedance devices The vo...

Page 53: ...Sources of EMI include radio and television broadcast transmitters communications transmitters including cellular phones and handheld radios devices incorporating microprocessors and high speed digita...

Page 54: ...teg rity of connectors can be damaged if they are not handled properly If the connector insulation becomes contami tiated the insulation resistance will be substantially re duced affecting high impeda...

Page 55: ...ypical connections Guard should be properly carried through as close as possible to the device under test to be completely effec tive Typically a guard shield around the DUT is used as shown in Figure...

Page 56: ...5OQ or IMQ depending on test conditions 1 7074 Card NOTE 707 Chassis tied lo measurement device chassis gure 2 39 AC Frequency Response Test Configuration All test results discussed here are exclusive...

Page 57: ...43 shows response with a 1MQ load 1 x 12 Configuration Response Curves Figure 2 42 and Figure 2 43 show typical results with the REF LEVEL DIV MARKER 4 841 150 OOOHz 0 OOOdB 3 OOOdB MAG A R 2 924dB lb...

Page 58: ...0 OOOdB 3 OOOdB START 5 OOOHz MARKER 5 991 101 600Hz MAG A R 2 990dB Conditions Row A tied to Backplane H12 Closed R Fi 50fi Magnitude 3dBIDIV Phase 4WDIV Figure 2 41 Model 7074 Frequency Response XL...

Page 59: ...OOOHz 0 OOOdB 3 OOOdB MAG A R 3 007dB Conditions All rows connected to Backplane H12 Closed Rs RL 50cl Magnitude 3dEvDIV Phase 45 lDIV START 5 OOOHz STOP 30 000 000 OOOHz Figure 2 42 Model 7074 Freque...

Page 60: ...A R 3 066dB I Illi 1 I I iIIII Ii 10 100 1K 10K 1OOK 1M 10M START 5 DOOHz STOP 30 000 000 OOOHZ Figure 2 43 Model 7074 Frequency Response RL 5021 Eight 1x 12 Configuration Conditions All rows connecte...

Page 61: ...ltage but shorter contact life See the specifications for card dif ferences 3 2 Resistor Testing The Model 7074 can be used to test a large number of re sistors using only one test instrument or group...

Page 62: ...an be tested using this configuration Although the 4 wire connection scheme does minimize problems caused by voltage drops there is one other po tentially troublesomeareaassociated with low resistance...

Page 63: ...tor contacts will have a detrimental effect on measurement accuracy unless steps are taken to avoid them Thermal EMF ef fects can be virtually eliminated by taking two voltage measurements E and El th...

Page 64: ...be performed with the aid of the Model 7074 include current gain tests leakage tests as well as tests to determine the common emitter characteristics of the device The following paragraphs discuss the...

Page 65: ...SECTION 3 Applicadons I 1 J 3 Simplified Equivalent Circuit Figure 3 4 Configuration forCurrent Gain and Common Emitter Tests 3 5...

Page 66: ...te 50 CLEAR7 __ 140 OUTPUT719 l lb X 150 60 OUTPUT716 IFAES Vce 30 THEN PRINT WARNING HAZARDOUS OLT AOX AGEWILLSE APPLIEDTO DE 70 VICE DURINGTEST 160 INPUT PRESS ENTERTO BE OUTPUT713 GIN A lZX 170 OUT...

Page 67: ...columns on the matrix card This particular configuration is best suited for ap plications requiring a large number of DUTs to be con nected to a several instruments In other cases the test configurati...

Page 68: ...mpers 3 r r 1 I 7071 Matrix Card 220 current I Source Lee r 1_ c r 1 r 1 I v 0 I I I I I 3 i I I I __I I i I I I I I I Pa I L A L J 7071 Matrix 7071 Matrix Card Card A Connections 6 SimplifiedEquivale...

Page 69: ...order to perform the tests a current from the Model 220 is applied to two terminals and the voltage is meas ured by the Model 196 across the two opposite termi nals A total of eight such measurements...

Page 70: ...R TO START 140 FORI lTOiZ 150 OUTPUT71 3 CA I By c I D I x 160 DCcTrmF 170 130 READG IC1 Y FORJ iTO 190 190 OUTPti 718 c C X OUTPti 718 c C X 2 WAIT 200 WAIT 210 OUTPUT707 ZlY 220 WAIT1 230 OUTPUT712...

Page 71: ...nt possible contamination The following pre cautions should be taken when servicing the card Handle the card only by the edges and handle Do not touch any board surfaces or components not as sociated...

Page 72: ...re to connect the test connector to the RELAY TEST jack on the rear panel of the Model 707 The Model 7074 RTC relay test connector plug should be connected to BANK A B to begin the test 4 3 3 Running...

Page 73: ...connectors of the card and do not touch the board surfaces or components On rack and panel connector blocks do not touch areas adjacent to the electrical contacts NOTE Failure of any performance verif...

Page 74: ...for complete details Application Path resistance Offset current isolation Contact potential Offset current isolation Contact potential All All Test Connections In order to complete the verification te...

Page 75: ...r the jumpers Each jumper should be no more than a couple of inches in length to minimize path resistance The Keitbley Model 7074 HCT or 707 HCT Hand Crimping Tool can be used to attach the crimp tail...

Page 76: ...SECTION 4 Service Information ROW A H Receptacle Rear panel view Figure 44 ROW A H Receptacle Contact Assignments Rear Pnncl View 4 6...

Page 77: ...ew Bank Receptacle Assignments Rear Panel View A9 B10 1 H HI L LO G GUARD 2 A refers lo Bank A also applies lo Banks C E and G 3 B refers to Bank B also applies to Banks D F and H 4 Plug is viewed fro...

Page 78: ...w A as shown in Figure 4 6 8 Connect OHMS LO and OHMS SENSE LO to the HI H terminal of Input 1 on the BANK A receptacle 9 From the front panel of the Model 707 close the Bank A Channel 1 relay Verify...

Page 79: ...d allow the unit to warm up for two hours before testing After warmup se lect the ZOOpA range and enable zero check and zero correct in that order Leave zero correct enabled for the entire procedure A...

Page 80: ...allow the unit to warm up for four hours for rated accuracy 3 Select the 2mV range on the Model 181 short the in put leads and press ZERO to null out internal off sets Leave ZERO enabled for the enti...

Page 81: ...stance from the known voltage and current levels and displays the resistive value NOTE Refer to Figure 4 10 for the following proce dure 1 Turn the Model 707 off if it is on and remove any jumpers or...

Page 82: ...measurement is the leakage resistance isolation between Row A In put 1 and Row B Input 2 14 Place the Model 617 voltage source in standby and enable zero check 15 Change the electrometer connections...

Page 83: ...standby connect the elec trometer to Row A of the multiplexer card as shown inFigure4 11 Test Equipment Location Row A and Row B Row B and Row C Row C and Row D Row D and Row E Row E and Row F Row F...

Page 84: ...SECTION4 Service Information i l Bank Inputs Model 7074 Figure 4 11 Diffmntinl Isolation Test Connections 4 14...

Page 85: ...A8 A9 A10 All A12 Al and Bl Al and Cl 16 ROW 17 ROW 18 ROW 19 ROW 20 ROW Al and Dl Al and El Al and Fl Al and Gl Al and Hl k 0 r 0 G I ql Ill Ill Ill 41111 I q1 Ill 111 i q 0 J J p 111 111 111 111 ll...

Page 86: ...rst be grounded to the bench or ta ble 5 Use only anti static type de soldering tools and grounded tip soldering irons 4 6 DISASSEMBLY CAUTION When disassembling or reassembling the card be careful no...

Page 87: ...the PC board 3 To reinstall the shield reverse the above procedure Make sue the metal side of the shield is faciw out CAUTION Make sure all screws are installed and se cured properly to enawe good me...

Page 88: ...steps refer to theID data timingdiagramshowninF 4 15 In addition to the procedure shown the relay s out lined in paragraph 4 3 3 can be used to aid in troubleshooting Also refer to paragraph 4 6 for...

Page 89: ...races Once all solder has been re moved carefully remove the relay by hand DO NOT pry up on the relay body with a screwdriver because the re sulting force could lift the surrounding trace Because of t...

Page 90: ...dress counter and set it to zero At this point a ROM address of zero is selected This pulse only occurs once 3 The NEXTADDR line is set low NEXTADDR going low increments the counter and enables parall...

Page 91: ...wer on safeguard circuit made up of U42 and asso ciate components ensures that relays do not randomly energizeuponpower up ThehyoANDgates U42 make up an R S flip flop Initially the Q output of the fli...

Page 92: ...resses When ordering parts be sure to include the fol lowing information 1 Card model number 7074 2 Card serial number 3 Part description 4 Circuit designation if applicable 5 Keithley part number 5 4...

Page 93: ...POSlTlON OR FILM RES 4 7K 5 1 4W COMPOSlTlON OR FILM RES ll K 5 1 4W COMPOSITION OR FILM RES 910 5 1 4W COMPOSlTlON OR FILM RES 200 5 1 4W COMPOSITION OR FILM TPl TPiO CONN TEST POINT BRACKET REAR PAN...

Page 94: ...SERIAL IN LTCH DRIVE UNC 5841A IC QUAD 2 INPUT NAND 74HCTOO IC 8 BIT PARALLEL TO SERIAL 74HCT165 IC LINE DRVR W 3 STATE OUTPUT 74HC244 IC l2 STAGE BINARY COUNTER 74HCT4040 STIFFENER BOARD CONN DUAL 3...

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Page 99: ...Appendix A Configuration Worksheet...

Page 100: ...APPENDIX A Configuration Worksheet w Lt...

Page 101: ...APPENDIX A Configuration Worksheer...

Page 102: ...APPENDIX A Configuration Worksheet...

Page 103: ...APPENDIX A Co urotion Worksheet S...

Page 104: ...APPENDIX A Configuration Worksheet...

Page 105: ...APPENDIX A Configuration Worksheer A 7...

Page 106: ...APPENDIX A Configurarion Worksheet...

Page 107: ...APPENDIX B Actual Configuration of 7074 Card and Backplane GENERAL PURPOSE PATHS B l...

Page 108: ...to zero c I Unstable 0 Will not read applied input 0 Overload 0 Calibration only 0 Data required 0 Certificate of calibration required attach any additional sheets as necessary Show a block diagram of...

Page 109: ...Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 5...

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