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Models 7011 -S and 701 I-C

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2. controls RC Relay power divs dO nd Opa diei palmi ca Power on safeguard Troubleshooting S Troubleshooting equipment oA d eU E IMS pap Troubleshooting LU PPP Ordering informati n u Factory service irr Component layouts and schematic cia List of Illustrations Figure 2 1 Figure 2 2 Figure 2 3 Figure 24 Figure 2 5 Figure 2 6 Figure 2 8 Figure 2 7 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 3 1 Figure 3 2 Figure 3 3 Figure 34 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 Figure 3 14 Figure 3 15 Figure 3 16 Figure 3 17 Figure 3 18 Figure 3 19 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Model 7011 simplified Four 1 x 10 multiplexer configuration jumpers not installed Two 1 x 20 multiplexer configuration jumpers installed e One 1 x 40 multiplexer configuration jumpers installed eene Model 7001 analog
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5. Mainframe multiplexer expansion eeeeeennntnn Bank to bank jumpers 1 42 4 2 1 22 nnn Backplane jumpers u Screw terminal connector ette Multi pin mass termination connector card Typical connection schemes nnne Single card Two card system Model 7011 installation and o 5 eon Coi PM Power Mainframe control of multiplexer card 11 Channel coru M Front 488 bus operatioru u Multiplexerswitching examples aerial Resistor Transistor Testing with EMT Measurement considerationis Magnetic Radio frequency interference Ground lo OS
6. l uuu Bank connections to backplane l uuu u u Differential switching example Single ended switching example T uuu uQ Sensing example SMU Two separate Multiplexer systerns Multiplexer input expansion example cscessssseceseesessnssnesrecsnessenverseracsnesnssensensentennansensssenanesnsess Mixed card type example Bank to bank jumper locations u u u a s Bank to bank jumper terminal identification Bank to bank jumper installation ente en tenente nennen u nnn tentem tenentem Backplane jumpers H AAAAA X Model 7011 screw terminal connector card Typical screw terminal connections u 1 2 1 4422 24 2 nnns Cable clamp for screw terminal connector Multi pin card terminal identification Typical round cable connection techniques l u uu a tnnt Model 7011 MTR connector pinout l luu 1 021 2 2 270494724144 09040 2 2 1040 0292020 4 7 4 Model 7011 KIT R with cable assembly l
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8. 1 T E doute es Se cess 27087 8 9N3 093 11 7011 170 3 3 8 9 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 1 Intermittent 3 Analog output follows display 1 Particular range or function bad specify IEEE failure 1 Obvious problem on power up Batteries and fuses are OK B Front panel operational 3 All ranges or functions are bad 1 Checked all cables Display or output check one LJ Drifts Unable to zero L Unstable J Will not read applied input LJ Overload L Calibration only 1 Certificate of calibration required L 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 out 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 on this service form KEITHLEY Keithley Instruments Inc Test Instrumentation Group 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S
9. Single card system example multi pin connector Single card system example screw terminal connector Two card system example multi pin connector Two card system example screw terminal connector card eene Two mainframe system example multi pin connector card eene Two mainframe system example screw terminal connector card eee Model 7011 C card installation in Model 7001 eene 7011 5 card installation in Model 7001 l l nennen entente enne nennen Channel status display Display organization for multiplexer channels 4 44 Model 7011 programming channel assignments eee eree eene nnne nennen teen 2 wire resistance testing eee iii Figure 4 5 Four wire resistance testing reset een tatnen tenent Figure 4 6 Low resistance testing tenente nnns Figure 4 7 Configuration for current gain and common emitter test Figure 4 8 Typical common emitter characteristics l uu 22 tentent tentent rennen nennt nennen enn Figure 4 9 Connecting multiplexer and matrix cards together uu Figure 4 10 Resistivity test configuration Figure
10. Q100 Q101 U106 U107 5 15 Service Information E ID DATA Tee a Naa Start B Figure 5 9 Start and stop sequences ID CLK 1 B 9 Data output from mainframe or ROM IDDATA Data output from mainframe or ROM Start Acknowledge Figure 5 10 Transmit and acknowledge sequence 5 16 5 5 3 Relay control Card relays are controlled by serial data transmitted via the relay DATA line A total of five bytes for each card are shifted in serial fashion into latches located in the card relay driver ICs The serial data is clocked in by the CLK line As data overflows one register it is fed out the Q S line of the register down the chain Once all five bytes have shifted into the card the STROBE line is set high to latch the relay information into the Q outputs of the relay drivers and the appro priate relays are energized assuming the driver out puts are enabled as discussed below Note that a relay driver output goes low to energize the corresponding relay 5 5 4 Relay power control A relay power control circuit made up of U106 0107 Q100 Q101 and associated components keeps power dissipated in relay coils at a minimum thus reducing possible problems caused by thermal EMFs During steady state operation the relay supply volt age V is regulated to 3 5V to minimize coil power dissipation
11. Figure 3 13 Single card system example screw terminal connector card Card Connections amp Installation 3 4 2 Two card system Both Figure 3 14 and Figure 3 15 show a system using two multiplexer cards installed in one Mode 7001 mainframe to configure a single 1 x 80 multiplexer sys tem Each card is configured as a single 1 x 40 multi plexer To accomplish this all bank to bank jumpers both cards are installed to connect Banks A B C and D together By leaving the backplane jumpers of both cards installed the banks of Card 1 are connected to the banks of Card 2 through the analog backplane of the Model 7001 mainframe resulting in the 1 x 80 configu ration Figure 3 14 shows how external connections can be made for the multi pin connector cards In this exam ple a single Model 7011 MTC 2 round cable assembly is cut in half to provide two cables each of which is un terminated at one end The unterminated ends of the two cables are hard wired to the instrument and DUT as shown in the drawing The other ends of these cables mate directly to the Model 7011 C multiplexer card as semblies Figure 3 15 shows how external connections can be made for the screw terminal connector card Single conductor connections are made directlv from the screw terminals of the connector card to the instrument and DUT 3 4 3 Two main rame system Both Figure 3 16 and Figure 3 17 show a system using three multiplexer cards installed in t
12. Instruction Manual Models 7011 S and 7011 C Quad 1 x 10 Multiplexer Cards Contains Operating and Servicing Information 7011 901 01 Rev C 12 92 Keithley Instruments Inc warrants this product to be free from detect in material and workmanship for a period of 1 year from date of shipment Keithley Instruments Inc warrants the following items for 90 day om 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 least 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 WARRANTY 15 IN LIEU OF ALL OTHE
13. nals 1A switched 30VA resistive load AC signals 125V rms or 175V AC peak be tween any two pins terminals 1A switched 60VA resistive load 4 3 Mainframe control of multiplexer card The following information pertains to the Model 7011 multiplexer card It assumes that you are familiar with the operation of the Model 7001 mainframe If you are not familiar with the operation of the main frame it is recommended that you proceed to Getting Started Section 3 of the Model 7001 Instruction Man ual after reading the following information 4 1 Operation 4 31 Channel assignments The Model 7001 has a channel status display Figure 4 1 that provides the real time state of each available channel The left portion of the display is for slot 1 Card 1 and the right portion is for slot 2 Card 2 Multiplexer organization of the channel status display for each slot is shown in Figure 4 2 The card contains 40 channels and is made up of four banks Bank A B C and D of 10 multiplexer inputs as shown in the il lustration To control the multiplexer mux card from the main frame each multiplexer input must have a unique CHANNEL assignment which includes the slot num ber that the card is installed in The CHANNEL assign ments for the multiplexer card are provided in Figure 4 3 Each CHANNEL assignment is made up of the slot designator 1 or 2 and the multiplexer channel To be consistent with Model 7001 oper
14. 10 Benk Backplona Bank D HI o d 1 Lo 2 9 J HI HI Hi 3 D 10 19 Lo Table of Contents 2 1 2 2 1 2 2 2 2 3 1 2 3 2 2 3 3 2 3 4 2 4 1 2 4 2 Warranty Manual addenda Safety symbols and Specifications I 1 Unpacking and 09 u Inspection for damage Shipping contents rennen Instruction manual Repacking for shipment a u u 4 800 42 712 21212 4 1 4 72 22 4 Optional 1 1 4 41 Introduction Basic multiplexer configurations u Multiplexer bank to bank 4 4 84 1 1 1 1 1 2 2 1 3 Typical multiplexer Single ended switching Differential switching 4 SMU connections Multiplexer expansion eens tnnnnnnn nnn Two card switching systems
15. 291 1104 28 O 5 ow a vM 55 lt A sz m 5 8 z 5 lt az M3NOS 890 93 5 Zx o dIMIS SNGHLBYNATOd Don c N33NDSOIIS 872 Yet x 20079 44972 401 208 1104 ow lt 3815 S82 3H r8 sinae 16 02 61 58 026026 o ___ 9 3 Table 6 3 Mass Terminated Connector Board for Model 7011 C Parts List C101 102 C103 CR101 105 E101 102 11004 K101 104 P1002 1003 Q101 103 R103 104 R105 R106 R107 R108 110 R109 R111 U101 U102 W100 105 BRACKET STANDOFF SHIELD CONNECTOR SHIM CONN BERG CONNECTOR JUMPER FOR W100 105 CAP 1UF 20 50V CERAMIC CAP 10F 20 50V CERAMIC DIODE SILICON IN4148 DO 35 FERRITE BEAD CONN 96 PIN 3 ROWS RLAY ULTRA SMALL POLARIZED TF2E 4 5V CONNECTOR FEMALE TRANS N CHAN MOSPOW FET V11713 TO 92 RES 1M 10 1 2W COMPOSITION RES 39 5 1 4W COMPOSITION OR FILM RES 10 5 1 4W COMPOSITION OR FILM RES 4 99K 1 1 8W METAL FILM RES 10K 5 1 4W COMPOSITION OR FILM RES 100K 5 1 4W COMPOSITION OR FILM RES 10K 1 1 8W METAL FILM IC QUAD 2 INPUT NOR 74HC02 IC DUAL COMP LM393 CONN BERG 2 PIN Keithley Part No 7011 307 ST 203 1 7011 311 7011
16. Do not attempt to perform these procedures unless you are qualified to do so 5 1 Introduction This section contains information necessary to service the Model 7011 multiplexer card and is arranged as fol lows 5 2 Handling and cleaning precautions Discusses handling precautions and methods to clean the card should it become contaminated 5 3 Performance verification Covers the procedures necessary to determine if the card meets stated specifications 5 4 Special handling of static sensitive devices Reviews precautions necessary when handling static sensitive devices 5 5 Principles of operation Briefly discusses circuit operation 5 6 Troubleshooting Presents some troubleshooting tips for the Model 7011 including relay replace ment precautions 5 2 Handling and cleaning precautions Because of the high impedance areas on the Model 7011 care should be taken when handling or servicing the card to prevent possible contamination The fol lowing precautions should be taken when servicing the card Handle the card only by the edges and shields Do not touch any board surfaces or components not associated with the repair Do not touch areas adjacent to electrical contacts When servicing the card wear clean cotton gloves Do not store or operate the card in an environment where dust could settle on the circuit board Use dry ni trogen gas to clean dust off the board if necessary Should it become necessary to
17. A
18. A Input 2 12 Bank A Input 3 13 Bank A Input 4 14 Bank A Input 5 15 Bank A Input 6 116 Bank A Input 7 17 Bank A Input 8 18 Bank A Input 9 19 Bank A Input 10 1110 Bank B None Bank B Input 1 111 Bank B Input 2 112 Bank B Input 3 113 Bank B Input 4 114 Bank B Input 5 1115 Bank B Input 6 1116 Bank B Input 7 117 Bank B Input 8 118 Bank B Input 9 119 Bank B Input 10 1120 Bank None Bank C Input 1 1121 Bank C Input 2 1 22 Bank Input 3 1193 Bank C Input 4 Bank C Input 5 Bank C Input 6 Bank C Input 7 Bank C Input 8 Bank C Input 9 Bank C Input 10 Bank D Bank D Input 1 Bank D Input 2 Bank D Input 3 Bank D Input 4 Bank D input 5 Bank D Input 6 Bank D Input 7 Bank D Input 8 Bank D Input 9 Bank D Input 10 Assumes Model 7011 installed in slot 1 of mainframe grammed as slot 1 and channel 5 13 Service Information Model 7025 Unterminated Banana to Banana Cable Triax Gable Source V and sind Model 617 Unterminated Note Setup shown is configured to test isolation between Bank and chassis ground E ee i p Figure 5 7 Common mode isolation test connections 5 4 Special handling of static sensitive devices CMOS and other high impedance devices are subject to possible static discharge damage because of the high impedance levels involved When handling such devices use the precautions listed below NOTE In order to pr
19. C In 2 Bank A In 3 and Bank 1n 3 Bank A In 4 and Bank C In 4 Bank A In 5 and Bank C In 5 Bank A In and Bank C In o Bank A in 7 and Bank C In 7 Bank A In 8 and Bank C In 8 Bank A In 3nd Bank C In Bank A In 10 and Bank C In 10 Bank B In 1 and Bank D In 1 Bank B n 2 and Bank D In 2 Bank B In 3 and Bank D In 3 Bank B In 4 and Bank D In 4 Bank B In 5 and Bank D In 5 Bank B In 6 and Bank D In 6 Bank B In 7 and Bank D In 7 Bank B In 8 and Bank D In 8 Bank B In 9 and Bank D In 9 Bank B In 10 and Bank jumper removal is described in paragraph 3 3 1 To configure the connector card for 4 pole operation only remove the jumpers between Banks C and D W102 and W103 Selecting 4 pole operation for a Model 7001 card slot is discussed in Section 4 of the Model 7001 Instruction Manual After the 4 pole mode is selected the Model 7001 mainframe will display just 20 channels for the chosen card slot Each closed channel will also close its paired channel on the card Although the four wire connection scheme minimizes problems caused by voltage drops there is one other potentially troublesome area associated with low resis tance measurements thermal EMFs caused by the re lay contacts In order to compensate for thermal EMFs the offset compensated ohms feature of the Model 196 DMM should be used To use this feature short the and LO ter
20. Table1 Parts List Relay Card for 7011 S and 7011 C 7011 100 Component Layout Relay Card for 7011 5 and 7011 C 7011 106 Schematic Relay Card for 7011 S and 7011 C NOTE The Model 7011 and 7012 use the same relay card only the connector cards are different Table 2 7011 160 7011 166 Table 3 7011 170 7011 176 Parts List Screw Terminated Connector Card for 7011 S Component Layout Screw Terminated Con nector Card for 7011 S Schematic Screw Terminated Connector Card for 7011 S Parts List Mass Terminated Connector Card for 7011 C Component Layout Mass Terminated Con nector Card for 7011 C Schematic Mass Terminated Connector Card for 7011 C Table 6 1 Relay Board for Model 7011 S and 7011 C Parts List Circuit Desig C100 109 118 119 C011 C112 113 114 115 117 31002 1003 K100 139 P2001 Q100 Q101 R100 R101 R102 103 R104 R105 R106 107 100 104 U105 1106 0107 W100 107 Description EJECTOR ARM ROLL PIN FOR EJECTOR ARMS SHIELD SOCKET FOR U105 CAP 10F 20 50V CERAMIC CAPIUF20 50V CERAMIC CAPBO 001UE20 6 500V CERAMIC CAP 10UF 20 100 25V ALUM ELEC CAP 150PF 10 1000V CERAMIC CONNECTOR MALE RELAY ULTRA SMALL POLARIZED TF2E 5V CONNECTOR RIGHT ANGLE MALE TRANS NPN PWR TIP31 TO 220AB TRANS N CHAN MOSPOW FET V11713 TO 92 RES 2 49K 1 1 8W METAL FILM RES 1 15K 1 1 8W METAL FILM RES 560 10 1 2W COMPOSITION RE
21. connector Mates to female twisted wire cabie crimp or solder connector MAXIMUM SIGNAL LEVEL DC Signals 110V DC between any two pins 1A switched 30VA resistive load AC Signals 125V RMS or 175V AC peak between any two pins switched 60V A resistive load COMMON MODE VOLTAGE 175V peak any pin to chassis CONTACT LIFE Cold Switching 105 closures At Maximum Signal Levels 105 closures CHANNEL RESISTANCE per conductor lt 10 CONTACT POTENTIAL 7011 5 500 nV per contact pair Hi Lo 1 5 pV per single contact 7011 C 1 5 per contact pair Hi Lo typically lt 1 pV 3 5 per single contact typically lt 3 OFFSET CURRENT 100 pA ACTUATION TIME 3 ms ISOLATION Bank gt 10 Q lt 25 pF Channel to Channel gt 1090 lt 50 pF Differential Configured as 1x10 gt 1090 lt 100 pF Configured as 1x40 gt 1090 lt 200 pF Common Mode Configured as 1x10 gt 1090 lt 200 pF Configured as 1x40 gt 1090 lt 600 pF CROSS TALK 1 2 500 Load Bank lt 40 dB Channel lt 40 dB INSERTION LOSS 500 Source 50 Load lt 0 1 dB below 1 MHz lt below 2 MHz RELAY DRIVE CURRENT per relay 16 mA ENVIRONMENT Operation 0 C to 50 C up to 35 C lt 80 RH Storage 25 to 65 C Specifications subject to change without notice 7011 Quad 1x10 Multiplexer 2 9 HI Backplane 10 4 Channa 7 OUTPUT
22. first press of STEP takes the mainframe out of the idle state The next press of STEP will close the first channel specified in the scan list Each subsequent press of STEP will se lect the next channel in the scan list 4 3 3 488 bus operation Bus operation is demonstrated using HP BASIC 4 0 The programming statements assume that the primary address of the mainframe is 07 Closing and opening channels The following SCPI commands are used to close and open channels CLOSe lt list gt OPEN lt list gt ALL The following statement closes channels 1 1 and 113 through 1 11 OUTPUT 707 clos 111 113 1111 Notice that the colon is used to separate the range limits of the following statements will open channels 12 4113 through 111 OUTPUT 707 open 11 113 1111 OUTPUT 707 open all Scanning channels There are many commands associated with scanning However it is possible to configure a scan using as lit tle as four commands These commands are listed as follows RST TRIGger SEQuence COUNt AUTo ROUTe SCAN lt list gt INIT The first command resets the mainframe to a default scan configuration The second command automatical ly sets the channel count to the number of channels in the Scan List the third command defines the Scan List and the fourth command takes the Model 7001 out of the idle state The following program will perform a single scan
23. for multiplex switching and is arranged as follows 22 Basic multiplex configurations Covers the basic multiplex configurations quad 1 x 10 configura tion dual 1 x 20 configuration and single 1 x 40 configuration The significance of the backplane jumpers is also covered here 23 Typical multiplex switching schemes Explains some of the basic ways a multiplexer can be used to source or measure Covers single ended switching differential floating switching and sensing 24 System expansion Discusses the various config urations that are possible by using multiple cards 2 2 Basic multiplexer configurations A simplified schematic of the Model 7011 multiplexer is shown in Figure 2 1 It is organized as four 1 x 10 multiplexer banks Each bank has 10 inputs and one output Two pole switching is provided for each multi plexer input with HI and LO switched Two or more banks can be jumpered together to expand multiplexer inputs and backplane jumpers provide bank connec tions to a second card installed in Model 7001 main frame 2 1 Multiplexing Basics re U UU 7011 Inputs 1 Bank A 1 Bank B Outputs 1 Bank C 1 1 MERECE ES Input 1 of 40 Switching Topology for all Channels Figure 2 1 Model 7011 simplified schematic 2 2 1 Multiplexer bank to bank jumpers Jumpers are installed on the connector card to co
24. the basic procedure in steps 6 through 10 to check Bank B Inputs 1 through 10 Channels 1 11 through 1120 Repeat the basic procedure in steps 6 through 11 for Banks C and D Channels 1121 through 1140 Turn off the Model 7001 and change the electrome ter connections as shown in Figure 5 2B Note that electrometer HI is connected to HI and LO of the Bank A output which are jumpered together Elec trometer LO is connected to chassis Repeat steps 6 through 12 to check that the com mon mode offset current is lt 100pA 5 5 Service information Model 7025 Unterminated Triax Cable Bank Inputs Model 617 Measure Current Note Setup shown is configured to test Bank A pathways for offset current Modei 7011 A Differential Model 7025 Unterminated Triax Cable Bank inputs Model 617 Measure Current Note Setup shown is configured 10 test Bank A pathways for offset current Model 7011 B Common Mode Figure 5 2 Differential offset current test connections 5 3 6 Contact potential tests These tests check the EMF generated by each relay con tact pair H and L for each pathway The tests simply consist of using a sensitive digital voltmeter Model 182 to measure the contact potential Perform the following procedure to check contact po tential of each path 1 Turn the Model 7001 off if it is on 2 Place jumpers between Banks A B B C and C D Turn on the Model 182 a
25. the card connector Figure 3 8 when it is mated to the card Shorting pins 1 to 1b allows the output relays to close 3 8 Round cable assemblies Figure 3 9 shows typical round cable connection techniques using accessories available from Keithley In Figure 3 9A connections are accomplished using a Model 7011 MTC 2 cable and a Model 7011 MTR bulk head connector The two meter round cable is termi nated with a 96 pin female DIN connector at each end This cable mates directly to the multi pin connector card and to the bulkhead connector The bulkhead con nector has solder cups to allow direct connection to in strumentation and DUT Figure 3 10 provide pinout for the bulkhead connector In Figure 3 9B connections are accomplished using a Model 7011 MTC 2 cable assembly that is cut in half The 96 pin female DIN connector on one end of the ca ble mates directly to the multi pin connector card The unterminated end of the cable is wired directly to in strumentation and DUT The other half of the cable as sembly could be used for a second switching card In Figure 3 9C connections are accomplished using a custom built cable assembly that consists of a Model 7011 connector and a suitable round cable Hita chi cable part number N28C7 P D 50TAB is 50 ductor cable Two of these cz les can be used to supply 100 conductors The connector has solder cups to ac commodate the individual wires of the unt
26. the manual The procedures explicitly state if the operator may per form them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products Only properly trained ser vice personnel may perform installation and service procedures Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Users of this product must be protected from electric shock at all times The responsible body must ensure that users are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product users in these circumstances must be trained to protect themselves from the risk of electric shock If the circuit is capable of operating at or above 1000 volis no conductive part of the circuit may be exposed As described in the International Electrotechnical Commission Standard IEC 664 digital multimeter measuring circuits Keithley Models 175A 199 2000 2001 2002 and 2010 measuring circuits are Installation Category I
27. through al 40 channels of a multiplexer card installed in slot 1 10 OUTPUT 707 RST 20 OUTPUT 707 trig seq coun auto on 30 OUTPUT 707 scan 8 111 1140 40 OUTPUT 707 init 50 END Line 10 Line 20 Line 30 Line 40 Selects a default configuration for the scan Sets channel count to the scan list length Defines the scan list Take the Model 7001 out of the idle state The Scan is configured to start as soon as this command is executed When the above program is run the scan will be com pleted in approximately 240 milliseconds 3msec delay for each relay close and a 3msec delay for each open which is too fast to view from the front panel An addi tional relay delay can be added to the program to slow down the scan for viewing The program is modified by adding line 25 to slow down the scan Also Line 5 is added to the beginning of the program to ensure that all channels are open before the scan is started 5 OUTPUT 707 open all 10 OUTPUT 707 20 OUTPUT 707 trig seg coun auto on 25 OUTPUT 707 trig del 0 25 30 OUTPUT 707 8 11111140 40 OUTPUT 707 INIT 50 END Operation Line5 Opens all channels Line25 Sets a 1 4 second delay after each channel closes 4 4 Multiplexer switching examples This paragraph presents some typical applications for the Model 7011 These include resistor testing transis tor testing and resistivity testing wh
28. unterminated end of the cable is con nected directly to the instrument and DUT Notice that the bank connections for the third multiplexer card are made at the instruments Figure 3 17 shows connections for the screw terminal connector card Single conductor connections are made directly from the screw terminals of the connector card to the instrument and DUT Card Connections amp installation and LO to Banks A thru D Instrument 7011 MTC 2 Cable Assembly Cut in half to provide two cables 02 gt 0 lt 02 0 41 DUT Test Fixture Notes 1 All bank to bank jumpers both cards must be installed 2 Backplane jumpers both cards must be installed 7001 Analog Backplane Single 1x80 Multiptexer Simplified Equivalent Circuit Figure 3 14 Two card system example multi pin connector card 3 15 Card Connections amp installation 164 individual conductors 22 AWG 1 4 41 DUT Test Fixture Notes 1 All bank to bank jumpers both cards must be installed 2 Backplane jumpers both Instruments cards must be installed Single 1x80 Multiplexer Simplified Equivatent Circuit Figure 3 15 Two card system example screw terminal connector card 3 16 Card Connections amp installation DUT Test Fixture Connector Kit 7001 2 Trigger Link Cabte 7011 MTC 2 Cable Assemhly Cut in half to provide two cables DUT Te
29. use solder on the circuit board use an OA based organic activated flux Re move the flux from the work areas when the repair has been completed Use pure water along with clean cot ton swabs or a clean soft brush to remove the flux Take care not to spread the flux to other areas of the circuit 5 1 Service information board Once the flux has been removed 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 he environment for several hours before use 5 3 Performance verification The following paragraphs discuss performance verifi cation procedures for the Model 7011 including path resistance offset current contact potential and isola tion With the Model 7011 s backplane jumpers installed the performance verification procedures must be per formed with only one multiplexer card the one being checked installed in the Model 7001 mainframe These conditions do not apply if the backplane jumpers are removed CAUTION Contamination will degrade the per formance of the card To avoid con tamination always grasp the card by Table 5 1 Verification equipment Description Model or part DMM Electrometer w voltage source Sensitive Digital Voltmeter Triax cable unterminated Low thermal cable unterminated Keithley Model 196 Keithley Model 617 Keithley Model 182 Keithley Mode
30. 01 01 Revision C Document Number 7011 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 this product and any associated instrumentation Although some in struments and accessories would normally be used with non haz ardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recog nize shock hazards and are familiar with the safety precautions re quired to avoid possible injury Read the operating information carefully before using the product The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instru ment They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating for example setting the line voltage or replac ing consumable materials Maintenance procedures are described in
31. 1 x 20 multiplexer configuration jumpers installed 2 3 Multiplexing Basics Bank A Output A 10 e 4 2 oa 14 22 e Jumpers Bank B 10 e 2 1 e 2 Bank C Jumpers 09 1 2 Bank D Jumpers Figure 2 4 One 1 x 40 multiplexer configuration jumpers installed 2 4 2 2 2 Backplane jumpers There are four pairs of backplane jumpers located on the relay card With the jumpers installed the banks of the multiplexer card are connected to the analog back plane of the Model 7001 allowing expansion with a sec ond 7001 card installed in the mainframe With the jumpers removed cut the multiplexer card is isolated from another card installed in the mainframe Multiplexing Basics The three pole analog backplane of the Model 7001 mainframe is shown in Figure 2 5 Through this analog backplane the banks of a Model 7011 multiplexer card installed in one slot can be connected to the banks or rows of a compatible card installed in the other slot of the mainframe Model 7001 Backplane Row 1 or Bank K a 4 Row 2 or Bank B gt y 82 5 Row 3 or Bank peor PR ERIT 7 Analog a even eat H High L Low G Guard Row Matrix Card 7012 Bank MUX Card 7011 Figure 2 5 M
32. 114 Bank B Input 4 to Bank B Input 5 Bank B and Input 4 1115 Bank B Input 5 to Bank B Input 6 Bank B and Input 5 1116 Bank B Input 6 to Bank B Input 7 Bank B and Input 6 117 Bank B Input 7 to Bank B Input 8 Bank B and Input 7 1118 Bank B Input 8 to Bank B Input 9 Bank B and Input 8 1119 Bank B Input 9 Bank B Input 10 Bank B and Input 9 120 Bank C Input 1 to Bank C Input 2 Bank C and Input 1 122 Bank C Input 2 to Bank C Input 3 Bank C and Input 2 1123 Bank C Input 3 to Bank Input 4 Bank C and Input 3 1124 Bank C Input 4 to Bank C Input 5 Bank C and Input 4 1125 Bank C Input 5 to Bank C Input 6 Bank C and Input 5 1126 Bank C Input 6 to Bank C Input 7 Bank C and Input 6 127 Bank C Input 7 to Bank C Input 8 Bank C and Input 7 1128 Bank C Input 8 to Bank C Input 9 Bank C and Input 8 1129 1130 5 11 Service Information 5 3 8 Differential and common mode isola tion tests These tests check the leakage resistance isolation be tween H and LO L differential and from HI H and LO L to chassis common mode of every bank and channel In general the test is performed by apply ing a voltage 100V across the terminals and then mea suring the leakage current The isolation resistance is then calculated as R V I In the following procedure the Model 617 functions as a voltage source and an am meter In the V I function the Model 617 internally cal culates the resistance from the known voltage
33. 18a 18 Output HI 10a 10 Output HI 2a 2 LO 252 89 172 81 LO 9c 73 1 1 65 Notes 1 Pins 9a and 9b pins 9 and 41 on schematic are shield 2 Short pins 1a to 1b on the mating connector pins 1 and 33 on schematic to allow the output relays on the connector card to close Figure 3 8 Multi pin card terminal identification 3 7 Card Connections amp Installation Typical connection techniques All external circuitry such as instrumentation and DUTs that you wish to connect to the multiplexer card must be terminated with a single 96 pin female DIN connector The following connection techniques pro vide some guidelines and suggestions for wiring your WARNING Before beginning any wiring proce dures make sute all power is off and any stored energy in external circuit xy is discharged NOTE External circuitry should be connected G red in only with the 7001 s pow e after Model7011 assembly is in iailed in the Model 7001 main frame Installation is covered in para graph 3 5 Output relays The multi pin connector card uses a relay for each of the four output banks These output relays are normally open to prevent any hazardous voltages via the mainframe backplane from appear ing on the pins of the aale DIN connector The output relays will only close when the Model 7011 MTC 2 ca bie assembly is connected to card If building you own cable assembly you must make sure that it shorts pins 1a to 1b of
34. 271 3 JSI1UH3HJS OTH 313 3 PIER uri nu o o o wid ed 4 e a u 5 e zd 2 4 ty n 8 200td IH IH IH an IH 01 oq IH 01 IH 51 1ngdinu NI NI NI NI NI NI NI NI ez lt 6 S 0t gt 20074 ztotr cz gt 200Td amp se 20074 2 0 oH 200 4 Sr 2 9 200 ator lt 20079 TrOID ex 5 200Td tb gt 29014 0 gt gt 200Td lt 5 gt 0079 9 5 gt 20054 lt Tr 2 g00rd 57 at 90074 og IH 91 IH IH 01 IH 01 IH in 5 g 200 4 69010 lt 9 2eotd 5001 lt gt 00 6001 lt 00 66016 z 00 6001 S 8 500 6091 lt e gt 20dtd 8901 lt gt 200Td 8001 lt 52 200Td gootr lt 9 20019 S 5 p 00td 80010 S 9 z 20018 800 S c gt 20014 gootr 8 soorr lt 5 00 2007 lt 2 TH
35. 309 CS 339 CS 476 C 237 1 C 365 1 28 CT 8 CS 514 RL 162 CS 748 3 TG 195 R 1 1M R 76 39 R 76 10 R 88 4 99K R 76 10K R 76 100K R 88 10K IC 412 IC 343 CS 339 2 m T6 81721 45355 24244 2 tu 4 a 5 N aif 7 mi 3 a 2 4 E a z 8 ak 4 nu e o o e vu n 4 at a a amp CIHO INI SUNSHOSLSNZ A37H1235 d 801233NNO02 OD LGWSHOS c Q rota LE w SI AA SOTM a be 59 01 SEN fot rootr Zotta Ng 00 broly IE 0070 roortr 50mm 50780 N lt 20074 001 lt 3 00 00 C gt 20915 00 SH 20072 n 252 20072 00 cr 1 200Te 001 lt gt 00 200 887 poctr C 20012 00 Cn 552 3 2 5 0913 20018 podtr lt 00 4 0 gt 001 00 99017 lt gt E00td 00 oF 20id 007 te gt gt 00 372 7oOEL 1
36. 4 11 Measurement required for resistivity 1 1 Figure 4 12 Path isolation Figure 4 13 Voltage attenuation by path isolation Figure 4 14 Power line ground loops Figure 4 15 Eliminating ground loops Figure 5 1 Path resistance test connections Figure 5 2 Differential offset current test Figure 5 3 Contact potential test connections 4 4 Figure 5 4 Bank isolation test 5 Figure 5 5 Channel to channel isolation test Figure 5 6 Differential isolation test connections sete Figure 5 7 Common made isolation test connections eruere tenen tenen innen Figure 5 8 Model 7011 block diagram a a u u u tenen nnne nnne 10020222 Figure 5 9 Start and stop HE Figure 5 10 Transmit and acknowledge eene nn nennrnnt nennen List of Tables Table 3 1 Table 3 2 Table 4 1 Table 5 1 Table 5 2 Table 5 3 Table 5 4 Table 5 5 Table 5 6 Bank to bank jumpers r
37. 7 Service Information 5 3 7 Bank and channel to channel isolation tests Bank isolation tests check the leakage resistance be tween adjacent banks Channel to channel isolation tests check the leakage resistance between a Bank Out put connection and a Bank Input connection with an adjacent Bank Input relay closed In general the tests are performed by applying a voltage 100V across the leakage resistance and then measuring the current The isolation resistance is then calculated as R 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 resistive value Perform the following steps to check bank and chan nel to channel isolation 1 Turn the Model 7001 off 14 it is on and remove any jumpers or test leads connected to the multiplexer card 2 Turn on the Model 617 and allow the unit to warm up for two hours before testing Unterminated Banana Cables 3 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 Connect the electrometer to the Model 7011 as shown in Figure 5 4 Install the Model 7011 in slot 1 CARD 1 of the Model 7001 and turn the mainframe on On the Model 617 select the 20pA range and re lease zero check On the Mode
38. 96 DMM Switching among the transistors being tested is of course performed by the Model 7011 multiplexer card In order to perform the current gain test the voltage source is first set to the desired value of The cur rent source is then set to a base current value that will result in the desired value of Ic as measured by the DMM The current gain can then be calculated as out lined above In order to reduce errors caused by voltage burden use a higher current range on the Model 196 DMM Doing so will result in the loss of one or two decades of reso lution but 3 or 4 1 digit resolution will probably be adequate for most situations 4 9 Operation DUT 20 Dual 1x20 MUX B Simplified Equivalent Circuit Figure 4 7 Configuration for current gain and common emitter test 4 10 Common emitter characteristic tests Common emitter characteristics are determined by setting the base current Ip to specific values At each Ig value the collector emitter voltage Vcg is swept across the desired range at specific intervals and the collector current is then measured When the data are plotted the result is the familiar family of common emitter curves Figure 4 8 The same test configuration that is used for current gain tests can be used for measuring common emitter characteristics The Model 224 is used to set the base current Ip to the desired values The Model 230 Volt age Source provides t
39. HELEN ed bt id Saints EN A Rhe anro Ld 06 yor 8 Loty goto T002d lt 2 _______ _______ Pus 5 2 1 ar 0024 zom ad 091f H toa 62 eoote 09 som 92 eootr 8 lt 2 t 2924 M 20617 n 0IM 2 a som 0 1 gt TOTH 4 aj ewy l ae ili cote DEEK nt 20010 0 ON 03908 N3NNUOS 1004097 LN3NOdHOO gaso Ofaie x1843ssu 1 T tot ttog trod L tot ttoc 2102 L r 101 1104 xuu 33504805 qUiNSlC0H r971 72083 age 939 NYG 25 7 0313 Iti 3H 3 5 31998 16 91 8 CISSROSSGOI IONOIONGAIQ S00 exxx STQ exx 104 ONY 2104 7704 803 3aniOgnsls 000084 OL 3833439 NOILEWYOSNI LNSNOdWOD 303 310N z 5 MEE 03H 3802 ef OS 123205 9013 M 201 1104 1 E pota 4 9 9000000 06000000 o 000091 5 inooo o o i27
40. I effects in some situations In some cases additional external filtering may also be re quired Keep in mind however that filtering may have detrimental effects on the desired signal 4 5 4 Ground loops When two or more instruments are connected together care must be taken to avoid unwanted signals caused by ground loops Ground loops usually occur when sensitive instrumentation is connected to other instru mentation with more than one signal return path such as power line ground As shown in Figure 4 14 the re sulting ground loop causes current to flow through the instrument LO signal leads and then back through power line ground This circulating current develops a small but undesirable voltage between the LO termi nals of the two instruments This voltage will be added to the source voltage affecting the accuracy of the mea surement Signal Leads Instrument 3 Figure 4 14 Power line ground loops Figure 4 15 shows how to connect several instruments together to eliminate this type of ground loop problem Here only one instrument is connected to power line ground instrument 1 Instrument 2 Instrument 3 Power Line Ground Figure 4 15 Eliminating ground loops Operation Ground loops are not normally a problem with instru ments having isolated LO terminals However all in struments in the test setup may not be designed in this manner When in doubt consult the manual for all in strumentation in the test
41. Multipiexer Figure 2 12 Multiplexer input expansion example Mixing card types Different types of cards can be used together to create some unique switching systems For example you could have a Model 7011 multiplexer card installed in one slot and a Model 7012 matrix card installed in the other slot Figure 2 13 shows a possible switching system using a matrix card and a multiplexer card The backplane jumpers for both the matrix and multiplexer cards must be installed This allows matrix rows to be con nected to multiplexer banks On the multiplexer card the bank to bank jumpers must be removed to main tain isolation between matrix rows See the instruction manual for the Model 7012 for complete information on the matrix card 2 4 2 Mainframe multiplexer expansion Multiplexer systems using up to 12 multiplexer cards are possible by using six Model 7001 mainframes to gether Each Model 7011 added to the system provides 40 additional inputs Paragraph 3 4 3 explains how to connect a test system using two mainframes 2 11 Multiplexing Basics 1 4 Columns 10 e 4 x 10 Matrix Notes 1 Models 7011 and 7012 backplane jumpers must be installed 2 Model 7011 bank to bank jumpers must be removed Figure 2 13 Mixed card type example 2 12 Card 2 u 7011 1 inputs 10 Bank A 1 10 Bank B 1 10 Bank 1 10 Bank D Quad 1 x 10 Mux Card Connectio
42. R 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 KEI THLEY 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 12 Ynmin Road Dewai Madian Beijing 100029 8610 62022886 Fax 8610 62022892 FRANCE Keithtey Instruments SARL BP 60 3 All e des Garays 91122 Palaiseau C dex 33 1 60 11 51 55 Fax 33 1 60 11 77 26 GERMANY Keithley Instruments GmbH Landsberger Strasse 65 D 82110 Germering Munich 49 89 8493070 Fax 49 89 84930759 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 44 118 9575666 Fax 44 118 9596469 ITALY Keithley Instruments SRL Viale S Gimignano 38 20146 Mil
43. S 1K 1 1 8W METAL FILM RES 220K 5 1 4W COMPOSITION OR FILM RES 10K 5 1 4W COMPOSITION OR FILM IC 8 BIT SERIAL IN LATCH DRIVER 5841A EPROM PROGRAM IC RETRIG MONO MULTIVIB 74HC123 IC AJD SHUNT REGULATOR TL431CLP JUMPER Order current firmware revision level Keithley Part No 7011 301 DP 6 1 7011 305 SO 72 C 365 1 237 1 22 001 C 314 10 C 64 150P CS 736 2 RL 149 CS 775 1 TG 253 TG 195 R 88 2 49K R 88 1 15K R 76 10K 536 7011 800 492 677 1 15 e i0 13315 AHYI S3NNUDOS 50695 TESSN3S SIIUW3H3S OTTI EATI LOIN oorin toto 001705 porty zota zota 0078 20 04 NO GaSN LON SiNUd NTS 39051 59067 6113 61 3 9119 811 nt NTO 9013 NO GTI n8 4 801 3167170404 AST STII 90 54 260415 Q 4436 6015 096 5978 096 gt g01 n9 vi T002d tr 100224 at oN 10023 Tr ON lt 1 T ast ae O 40 t 13345 2 c v a 8 AN AN is Pew So0r rr0 c CXVI N3NNUOS 3SOdH nd TUNSNZ9 5 wun AS T
44. When a relay is first closed the STROBE pulse applied to U106 changes the parameters of the re lay supply voltage regulator Q100 allowing the relay supply voltage V to rise to 5 7V for about 100msec This brief voltage rise ensures that relays close as quickly as possible After the 100msec period has elapsed the relay supply voltage V drops back down to its nominal steady state value of 3 5V 5 5 5 Power on safeguard NOTE The power on safeguard circuit dis cussed below is actually located on the digital board in the Model 7001 main frame Service Information A power on safeguard circuit made up of U114 a D type flip flop and associated components ensures that relays do not randomly energize on power up and power down This circuit disables all relays all relays are open during power up and power down periods The PRESET line on the D type flip flop is controlled by the 68302 microprocessor while the CLK line of the D type flip flop is controlled by a VIA port line on the 68302 processor The Q output of the flip flop drives each switch card relay driver IC enable pin U100 U104 pin 8 When the 68302 microprocessor is in the reset mode the flip flop PRESET line is held low and Q out imme diately goes high disabling all relays relay driver IC enable pins are high disabling the relays After the re set condition elapses 200msec PRESET goes high while Q out stays high When the first valid STROBE
45. allation 3 3 2 Backplane jumpers The Model 7001 mainframe has an analog backplane that allows the banks of a Model 7011 multiplexer to be internally connected to a compatible switching card in stalled in the other slot see paragraph 2 4 1 for details The backplane jumpers for the multiplexer card assembly are located on the relay card as shown in Figure 3 4 The card is shipped from the factory with the jumpers installed Jumper removal Perform the following steps to remove backplane jumpers 1 If mated together separate the relay card from the connector card by removing the mounting screw and pulling the two cards away from each other Remember to only handle the cards by the edges and shields to avoid contamination 2 Use Figure 3 4 to locate the jumper s that are to be removed 3 It is not necessary to physically remove the jump ers from the PC board Using a pair of wire cutters cut one lead of each jumper 3 3 Card Connections amp installation umper installation Referring to Figure 3 4 for jumper locations perform the following steps to install backplane row jumpers 1 If mated together separate the relay card from the connector card by removing the mounting screw and pulling the two cards away from each other Remember to only handle the cards by the edges and shields to avoid contamination 2 Physically remove a cut jumper by unsoldering it from the PC board 3 Install a new 22 AWG jumpe
46. ame CAUTION To prevent contamination to the mul tiplexer card that could degrade per formance only handle the card assembly by the edges and shields Multiplexer card installation Perform the following steps to install the multiplexer card assembly in the Model 7001 mainframe Card Connections amp Installation WARNING Turn off power from all instrumenta tion including the Model 7001 main frame and disconnect their line cords Make sure all power is re moved and any stored energy in ex ternal circuitry is discharged 1 Mate the connector card to the relay card if they are separated Install the supplied 4 40 screw at the end of the card to secure the assembly Make sure to han dle the cards by the edges and shields to prevent contamination 2 Facing the rear panel of the Model 7001 select the slot CARD 1 or CARD 2 that you wish to install the card in 3 Referring to Figure 3 18 for Model 7011 C installa tion or Figure 3 19 for Model 7011 S installation feed the multiplexer card assembly into the desired siot such that the edges of the relay card ride in the rails 4 With the ejector arms in the unlocked position push the card assembly all the way into the mainframe until the arms engage into the ejector cups Then push both arms inward to lock the card into the mainframe 5 For the 7011 C also install the screw shown in Fig ure 3 18 Multiplexer card removal To remove the multiplexer card
47. and current levels and displays the resistance value erform the following steps to check differential and lt ommon mode isolation 1 Turn the Model 7001 off if it is on and remove any jumpers and test leads connected to the multiplex er card 2 Turn on the Model 617 and allow the unit to warm up for two hours for rated accuracy 3 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 Model 617 Umerninaied Banana Cable Note Setup shown is configured to test isolation between HI and HU Ht LO of Bank A Figure 5 6 Differential isolation test connections 10 11 WARNING The following steps use high voltage 100V Be sure to remove power from the circuit before making con nection changes 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 V I measurement func tion by pressing SHIFT OHMS With the Model 617 in standby connect the elec trometer to Bank A of the multiplexer card as shown in Figure 5 6 Install the Model 7011 in slot 1 CARD 1 of the mainframe and turn the Model 7001 on Make sure all the relays are open Press OPEN ALL on the Model 7001 On the Model 617 disable zero check and press OPERATE to source 100V After al
48. ano 39 2 48303008 Fax 39 2 48302274 NETHERLANDS Keithley Instruments BV Avelingen West 49 4202 MS Gorinchem e 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 1FL 1 Min Yu First Street Hsinchu Taiwan R O C 886 35 778462 Fax 886 35 778455 Models 7011 S and 7011 C Instruction Manual 1991 Keithley Instruments Inc Test Instrumentation Group All Rights Reserved Cleveland Ohio U S A Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes subsequent updates Addenda which are released between Revisions contain important change information that the user should incorporate immediately into the manual Addenda are numbered 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 Revi sion includes a revised copy of this print history page Revision A Document Number 7011 901 01 November 1991 Addendum A Document Number 7011 901 02 a Revision B Document Number 7011 9
49. anty status of the multiplexer card Write ATTENTION REPAIR DEPARTMENT on the shipping label Fill out and include the service form located at the back of this manual General information 1 8 Optional accessories The following accessories are available for use with the Model 7011 Model 7011 ST This screw terminal connector card is identical to the one provided with the Model 7011 5 assembly An extra screw terminal connector card al lows you to wire a second test system without disturb ing the wiring configuration of the first connector card Model 7011 KIT R This connection kit includes a 96 pin female DIN connector that will mate directly to the connector on the Model 7011 C or to a standard 96 pin male DIN bulkhead connector see Model 7011 MTR This connector uses solder cups for connections to external circuitry It includes an adapter for a round cable and the housing Model 7011 MTC 2 This 2 meter round cable as sembly is terminated with a 96 pin female DIN connec tor on each end It will mate directly to the connector on the Model 7011 and to a standard 96 pin male DIN bulkhead connector see Model 7011 MTR Model 7011 MTR This 96 pin male DIN bulkhead connector uses solder cups for connections to external circuitry It will mate to the Model 7011 connec tor and Model 7011 MTC 2 cable assembly Multiplexing Basics 2 1 Introduction This section covers the basics
50. assembly first unlock it by pulling the latches outward then pull the card as sembly out of the mainframe Remember to handle the card assembly by the edges and shields to avoid con tamination that could degrade performance Card Connections amp Installation Ejector Arms 2 q 4 7 2 unlock card Screw screw CD Lock card Figure 3 18 Model 7011 C card installation in Model 7001 3 20 Card Connections amp Installation re au lt Elector Arms 2 av Unlock card Lock card Figure 3 19 7011 S card insta lation in Model 2001 3 21 Operation 4 1 Introduction The information in this section is formatted as follows 42 Power limits Summarizes the maximum power limits of the Model 7011 multiplexer card assem bly 43 Mainframe control of multiplexer card Summa rizes programming steps to control the multi plexer card from the Model 7001 Switch System mainframe 44 Multiplexer switching examples Provides some typical applications for using the Model 7011 45 Measurement considerations Reviews a num ber of considerations when using the Model 7011 to make measurements 4 2 Power limits CAUTION To prevent damage to the card do not exceed the maximum signal level specifications of the card Maximum signal levels To prevent overheating or damage to the relays never exceed the following maximum signal levels DC signals 110V between any two pins termi
51. asure the leakage current Test connections are shown in Figure 5 2 Perform the following procedure to check offset cur rent 1 Turn the Model 7001 off if it is on and remove any jumpers or wires connected to the multiplexer card 2 Connect the triax cable to the Model 617 but do not connect it to the multiplexer card at this time 3 Turn on the Model 617 and allow the unit to warm up for two hours before testing After warm up se lect the 200pA range and enable zero check and zero correct in that order Leave zero correct en abled for the entire procedure Also be certain that V Q GUARD is OFF and ground strap is connect ed to LO 4 Connect the triax cable to Bank A and LO as shown in Figure 5 2A 10 11 12 13 14 Service information Install the Model 7011 in slot 1 CARD 1 of the Model 7001 Turn on the Model 7001 and program the unit to close Channel 111 Bank A Input 1 Onthe Model617 disable zero check and allow the reading to settle Verify that the reading is lt 100pA This specification is the offset leakage current of the pathway Enable zero check on the Model 617 and open Channel 111 from the front panel of the Model 7001 Repeat the basic procedure in steps 6 through 8 to check the rest of the pathways Inputs 2 through 10 of Bank A Channels 112 through 1110 Turn off the Model 7001 and change the electrome ter connections to Bank B Repeat
52. ation 2 Using an insulated screwdriver connect the cir cuitry to the appropriate terminals Figure 3 6 shows how the output of Bank A would be con 99096090606 Figure 3 6 nected toan Typical screw termina connections 3 Referring to Figure 3 7 remove the top half of the cable clamp as follows A Loosen the cable clamp screw enough to disen gage it from the bottom half of the cable clamp B Using your thumb and forefinger press the re taining clips inward and with your other Screw hand remove the top half of the clamp 4 Route wires under wire guide connector shim 5 Route the wires through the bottom half of the ca ble clamp 6 Replace the top half of the clamp It simply snaps onto the bottom half of the clamp Tighten the ca ble clamp screw The clamp serves as a strain relief for terminal block wires 7 Mate the connector card to the relay card The Model 7011 is now ready to be installed in the Model 7001 mainframe See paragraph 3 5 for de tails Figure 3 7 Cable clamp for screw terminal connector card Card Connections amp Installation 3 3 4 Multi pin mass termination connec tor card Since connections to external circuitry are made at the 96 male DIN bulkhead connector there is no need to separate the connector card from the relay card If the connector card is separated from the relay card carefully mate them together and install the supplied 4 40 mounting screw Make sure to
53. ation the slot designa tor and mux input are separated by exclamation points 9 Some examples of CHANNEL assignments are as follows CHANNEL 111 Slot 1 Channel 1 Input 1 of Bank A CHANNEL 1140 Slot 1 Channel 40 Input 10 of Bank D CHANNEL 2123 Slot 2 Channel 23 Input 3 of Bank C CHANNEL 2136 Slot 2 Input 36 Input 6 of Bank D 7001 Display CARD 1 CARD 2 a Open Channel wawas Closed Channel Figure 4 1 Channel status display Operation _ 9809900909 Display organization for multiplexer channels GO D GS Ge Ge D Ge Dis A Slot 1 Card 1 131 132 784 35 156 1 2 3 4 5 6 7 8 9 10 22 35 24 25 26 27 26 29 210 221 222 223 224 225 226 227 226 229 2190 Slot 2 2 251 2132 233 2154 235 2136 2137 258 259 2o Examples 1118 Slot 1 Channel 18 Input 8 Bank 2196 Slot 2 Channel 36 Input 6 Bank D Figure 4 3 Model 7011 programming channel assignments 4 3 Operation 4 3 2 Front panel control Closing and opening channels A multiplexer channel is closed from the front panel by simply keying in the CHANNEL assignment and pressing CLOSE For example to close channel 36 In put 6 of Bank D of a multiplexer card installed in slot 2 key in the following channel list and press CLOSE SELECT CHANNELS 2136 The above closed channel can be open
54. baal ca 199 DMM 7011 DUT B Simplified Equivalent Circuit Figure 4 4 2 wire resistance testing Four wire resista tests More precise measurements over a wider range of sys tem and DUT conditions can be obtained by using the four wire measurement scheme shown in Figure 4 5 Here separate sense leads from the Model 196 DMM are routed through the multiplexer to the resistor un der test The extra set of sense leads minimizes the ef fects of voltage drops across the test leads Note however that an extra two poles of switching are re quired for each resistor tested For this reason only 20 resistors per card can be tested using this configura tion The Model 7011 can be configured for 20 channels of 4 pole operation by isolating Banks A and B from Banks C and D and by programming the Model 7001 main frame for 4 pole mode The resulting paired channels are shown in Table 4 1 Table 4 1 Paired Channels in 4 pole Operation 7001 CHANNEL assignment 10 11 12 13 14 15 16 17 18 19 20 Bank D In 10 land 21 2 and 22 3 and 23 4 and 24 5 and 25 6 and 26 7 and 27 8 and 28 9 and 29 10 and 30 31 12 and 32 13 and 33 14 and 34 15 and 35 5 and 36 i 17 and 37 18 and 38 19 and 39 20 and 40 Connection designations Bank A In 1 and Bank C In 1 Bank A In 2 and Bank
55. cation is provided by Figure 3 2 On the drawing the six terminal pairs are labeled W100 through W105 The top three terminal pairs W101 W103 and W105 are used to connect the LO terminals of the banks together The bottom terminal pairs W100 W102 and W104 are used to connect the HI ter minals of the banks together Table 3 1 summarizes the effects of each jumper Bank Bank Bank AtoB BtoC CtoD e e e W101 W103 W105 H e W100 W102 W104 Figure 3 2 Bank to bank jumper terminal identification Table 3 1 Bank to bank jumpers refer to Figure 3 2 Installed jumper Effect Connect Bank A LO to Bank B LO Connect Bank A HI to Bank B HI Connect Bank B LO to Bank C LO Connect Bank B HI to Bank C HI Connect Bank C LO to Bank D LO Connect Bank HI to Bank D HI Referring to Figure 3 1 for jumper locations perform the following steps to install bank to bank jumpers 1 If mated together separate the relay card from the connector card by removing the mounting screw and pulling the two cards away from each other Remember to only handle the cards by the edges and shields to avoid contamination 2 Refer to Figure 3 2 and Table 3 1 to determine which jumpers to install 3 Using Figure 3 3 as a guide install the jumpers on the appropriate terminal pairs Card Connections amp Installation Jumper Jumper Terminal Pair Figure 3 3 Bank to bank jumper inst
56. ctors do not touch areas adjacent to the electrical contacts Dirt build up over a period of time is another possible source of contamination To avoid this prob lem operate the mainframe and multiplexer card in a clean environment If a card becomes contaminated it should be thorough ly cleaned as explained in paragraph 5 2 3 3 Connections This paragraph provides the basic information needed to connect your external test circuitry to the multiplex er It includes the installation of the bank to bank jumpers on the connector card installation removal of backplane jumpers on the relay card and detailed in 3 1 Card Connections amp Installation formation on making external connections to the two available connector cards WARNING The following connection informa tion is intended to be used by quali fied service personnel Failure to recognize and observe standard safe ty precautions could result in person al injury or death 55 Bank to Bank Jumper Terminals eio e A Screw Terminal Connector Card Figure 3 1 Bank to bank jumper locations 3 3 1 Bank to bank jumpers As explained in paragraph 2 2 1 the banks of the mul tiplexer card can be connected together using plug in jumpers to form larger multiplexers The locations of the bank to bank jumper terminals for both connector cards are shown in Figure 3 1 Bank to Bank nals B Multi pin Connector Card Terminal identifi
57. cuits including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable national safety approvals may be used if the rating and type arc the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that sc lected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean the instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument 7011 SPECIFICATIONS MODEL 7011 S Quad 1x10 Multiplexer with Screw Terminals MODEL 7011 C Quad 1x10 Multiplexer with Mass Terminated Connector MULTIPLEX CONFIGURATION Four independent 1x10 2 pole Multi plex banks or two independent 1x10 4 pole Multiplex banks Adjacent banks can be connected together Jumpers can be removed to isolate any bank from the backplane CONTACT CONFIGURATION 2 pole Form A Hi Lo CONNECTOR TYPE 7011 5 Screw terminal 16AWG maximum wire size with 092 inch O D 28 Conductors maximum 22AWG typical wire size with 062 inch O D 88 Conductor maximum 7011 C 96 Pin male Eurocard
58. d Source HI Sense Sense LO Source LO 2 3 4 SMU connections Figure 2 10 shows how to connect a Keithley Model 236 237 or 238 Source Measure Unit to the multiplexer card By using triax cables that are unterminated at one end the driven guard and chassis ground are physical ly extended all the way to the card Bank A B 011 Source or Bank C D Input 1 10 Measure Figure 2 9 Sensing example 2 8 M ultiplexing Basics Bank A B Bank C D Sense LO Output LO o Triax Cables 3 236 237 238 WARNING Hazardous voltages may be present on GUARD Make sure all cable shields are properly insulated before applying power Figure 2 10 SMU connections 2 9 Multiplexing Basics 2 4 Multiplexer expansion With the use of additional switching cards and main frames larger systems can be configured Each Model 7001 Switch System mainframe will accommodate up to two cards and up to six mainframes can be connect ed together Thus a switch system using as many as 12 cards can be configured 2 4 1 Two card switching systems Each Model 7001 Switch System mainframe can ac commodate two cards to allow the following switching configurations Separate switching systems Two singie card systems can be configured by remov ing the backplane jumpers from one of the cards The Card 1 in 7011 Ex 1 10 qp p 00 8018 1 10 1x10 Multiplex
59. ed by pressing OPEN or OPEN ALL The OPEN key opens only the channels specified in the channel list and OPEN ALL opens all channels The following display is an example of a channel list that consists of several channels SELECT CHANNELS 21 213 2122 2125 Notice that channel entries are separated by commas com aa is inserted by pressing ENTER or the right cursor key gt The channel range is specified by using the hyphen gt key separate the range limits Press ing CLOSE will clc all the channels specified in the channe list Pressing OPEN or OPEN ALL will open the channels Scanning channels Multiplexer channels are scanned by creating a scan list and configuring the Model 7001 to perform a scan The scan list is created in the same manner as a channel list see Closing and Opening Channels However the scan list is specified from the SCAN CHANNEL dis play mode The SCAN LIST kev toggles between the channel list and the scan list The following shows an example of a scan list SCAN CHANNELS 21 213 2121 2125 When scan is performed the channels specified in the scan list will be scanned in the order that they are pre sented in the scan list 4 4 A manual scan can be performed by using the RESET default conditions of the Model 7001 RESET is selected from the SAVESETUP menu of the main MENU When RESET is performed the mainframe is configured for an infinite number of manual scans The
60. efer to Figure 3 2 2 12 2 4 2 1 2 4 42 1 3 3 Mass termination accessories Paired Channels 4 pole Operation Verification equipment Bank isolation test Channel to channel isolation test summary U U Differential and common mode isolation testing Recommended troubleshooting eduipment a 4 4 2 Troubleshooting procedure 4 4 10 09 0402222 v vi General Information 1 1 Introduction This section contains general information about the Model 7011 Quad 1 x 10 Multiplexer card There are two basic versions of this multiplexer card the Model 7011 S and the Model 7011 C The Model 7011 S assembly consists of a screw terminal connector card and a relay card External test circuits are wired directly to the screw terminals of the connector card Also available from Keithley is the Model 7011 ST This is an extra screw terminal connector card With an extra connector card you can wire a second test system without disturbing the wiring configuration of the first test system The Model 7011 C assembly consists of a multi pin mass termination connector card and the relay card External test circuit connections to the multiplexer are made via the 96 pin male DIN connector on the c
61. elding may prove to be more effective connected to circuit com mon Chassis ground is accessible at the rear panel of the Model 7001 2 3 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 The instrument is connected to the output of one of the banks and the DUT is shown connected to one of the inputs for that bank Bank A D LO o Source or Measure Figure 2 7 Single ended switching example Bank A B Hi LO o Source or Measure Bank C D Figure 2 8 Differential switching example Multiplexing Basics 2 3 2 Differential switching The differential or floating 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 pathway Each terminal of the instrument can be switched to any available input in the test system Optional Shield Input 1 10 Input 1 10 1 1 10 2 7 Multiplexing Basics 2 3 3 Sensing Figure 2 9 shows how the multiplexer card can be con figured to use instruments that have sensing capability The main advantage of using sensing is to cancel the ef fects of switch card path resistance lt 1Q and the resis tance of external cabling Whenever path resistance is a consideration sensing should be use
62. erminated cable Figure 3 11 provides an exploded view of the connector assembly and shows how the cable is con nected The connector end of the resultant cable assem bly mates directly to the multi pin connector card The unterminated end of the cable assembly is wired di rectly to instrumentation and DUT Card Connections amp Installatic gt Multi Pin Wire instrumentation and DUT to bulkhead connector A ee See Figures 3 8 and 3 10 an for terminal identification 7011 MTC 2 cable assembly 7011 MTR bulkhead connector Multi Pin Wire directly to instrumentation E and DUT 7011 MTC 2 Cut in Half Multi Pin Wire directly to ae instrumentation cs 3 and DUT Cable 7011 Kit R Connector Kit Notes Figure 3 11 provides an exploded view showing how the connector with cable is assembled Cable Hitachi p n N2807 P D 50TAB is a 50 conductor round cable Two of these cables can be used to supply 100 conductors Figure 3 9 Typical round cable connection techniques 3 9 Card Connections amp Installation View from solder cup side of connector Note See Figure 3 8 for terminal identification Figure 3 10 Model 7011 MTR connector pinout Figure 3 11 Model 7011 KIT R with cable assembly 3 4 Typical connection schemes The following information provides some typical con nection schemes for single card two card and two mainframe system configurations Con
63. ers Figure 2 11 Two separate multiplexer systems 2 10 two cards will be controlled by the same mainframe but they will be electrically isolated from each other Figure 2 11 shows an example using two Model 7011 multiplexer cards Multiplexer input expansion You can double the number of multiplexer inputs by simply installing two as shipped Model 7011s in the Model 7001 mainframe By leaving the backplane jumpers installed the banks of the multiplexer card in stalled in slot 1 CARD 1 are automatically connected to the banks of the multiplexer card installed in slot 2 CARD 2 through the analog backplane Figure 2 12 shows an example of input expansion Each Model 7011 card is configured as four 1 x 10 mul tiplexers By connecting the banks together via Model 7001 analog backplane the resultant multiplexer sys tem has 20 inputs for each of the four banks Notice that if all the bank to bank jumpers for both cards were installed the result would be a single 1 x 80 mul tiplexer 7001 Analog Backplane E a Four 1x10 Multiplexers Backplane Jumpers Removed LI LIL LI 1 10 S WI Wi OE UY Quad 1x10 Multiplexers Multiplexing Basics 7001 Analog Backplane Gard 2 7011 Quad 1x10 Multiplexers Backplane Jumpers installed Quad 1x20
64. event damage assume that all parts are static sensitive Bank Inputs 58 Banana Cable Model 7011 Such devices should be transported and handled only in containers specially designed to prevent or dissipate static build up Typically 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 or use Remove the devices from their protective contain ers only at a properly grounded workstation Also ground yourself with an appropriate wrist strap while working with these devices Handle the devices only by the body do not touch the pins or terminals Any printed circuit board into which the device is to be inserted must first be grounded to the bench or table Use only anti static type de soldering tools and grounded tip soldering irons 5 5 Principles of operation The following paragraphs discuss the basic operating principles for the Model 7011 and can be used as an aid in troubleshooting the card The schematic drawing of the card is shown on drawing number 7011 106 locat ed at the end of Section 6 5 5 1 Block diagram Figure 5 8 shows a simplified block diagram of the Model 7011 Key elements include the relay drivers and relays as well as the ROM which contains card ID and configuration information These variou
65. from the ter minal blocks of the connector card to instrumentation and DUTs When using a single card system you will want to make sure that the card remains electrically isolated from any other switching cards There are several ways to ensure isolation for a single card in the Model 7001 mainframe 1 Vacate the other mainframe slot If there is a Model 701X card installed in the other slot remove it 2 Remove the backplane jumpers on the multiplexer card This will disconnect the card from the analog backplane of the mainframe 8 Remove the backplane jumpers from the switching card installed in the other slot zard Connections amp Installation HE and LO to Banks A and B Fixture for Connector Hi and LO to 585 84 Individual Conductors 4 7011 2 Cable Assembly 7011 MTR 5 Bulkhead Connector 1 20 1 20 DUT Test Fixture Notes Bank to Bank jumpers installed as follows Bank A connected to Bank B Bank C connected to Bank D Simplified Equivalent Circuit Figure 3 12 Single card system example multi pin connector card Card Connections amp Installation HI and LO to Banks and instrument HI and LO to Banks C and D DUT Test Fixture as follows instruments 20 Pe Dua 1x20 Simplified Equivalent Circuit Notes Bank to bank jumpers installed Bank A connected to Bank B Bank C connected to Bank D
66. handle the cards by the edges and shields to avoid contamination Terminal identification for the DIN connector of the multi pin connector card is provided by Figure 3 8 This connector will mate to a 96 pin female DIN con nector Keithley has a variety of cable and connector accesso ries available to accommodate connections from the connector card to test instrumentation and DUT de vices under test In general these accessories which are summarized in Table 3 2 utilize a round cable as sembly for connections Table 3 2 Mass termination accessories 96 pin female DIN connector and housing for round cable 7011 7011 2 Two meter round cable assembly terminated with a 96 pin female DIN connector on each end 96 pin male DIN bulkhead con nector Card Connections amp Installation Pins of the Model 7011 C mass termination connector can be identified in one of three ways 1 Mux terminal consisting of banks A D and inputs 1 10 2 Connector description consisting of rows a c and columns 1 32 3 Schematic and component layout designation 1 96 The following pinout diagrams show the correspondence between these arrangements 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 1615 14 1312 11 10 9 8 11 of connector ooo Connector Schem Connector Schem C
67. he DUTs would be connected to the col umns Operation Backplane Jumpers E din i i ee i i 1 2 71 I 2 8 lt I gt lt l I D S k I 7001 3 Pole 7011 General Purpose Multiplexer Backplane Card Note The 7011 Bank to Bank jumpers must be removed Figure 4 9 Connecting multiplexer and matrix cards together Resistivity tests The general test configuration shown in Figure 4 10 can be used to perform resistivity tests on semiconduc tors Such tests can yield important information such as doping concentration As shown in Figure 4 10 the Model 7011 switches ten samples for the test The Model 7012 Matrix card al lows any device test node to be connected to any in strument terminal The Model 220 Current Source wee Instruments Lee PEA a 7012 Matrix Card forces a current through the DUT and the Model 196 DMM measures the voltage across the device In order to minimize errors caused by sample loading the Mod el 196 should be used on the 300mV or 3V ranges Also resistance values should be 1 or less In order to perform the tests a current from the Model 220 is applied to two terminals and the voltage is measured by the Model 196 across the two opposite terminals A total of eight such measurements are re q
68. he collector emitter voltage and the Model 196 DMM measures the collector cur rent Ic ma 0 1 2 3 4 5 volts Figure 4 8 Typical common emitter characteristics Operation 4 4 3 Testing with matrix cards The Model 7011 can be added to a matrix switching system to enhance the test capabilities of that system The following paragraphs discuss an overall multi plexer matrix switching system and also briefly out line a typical test that can be made with such a system Multiplexer and matrix card connections Figure 4 9 shows a typical system using Model 7012 and 7011 cards together In this instance the multiplex er card is configured as four 1 x 10 multiplexers Note that rows of the matrix card are connected to the banks of the multiplexer card through the analog backplane of the mainframe no external wiring is necessary to connect the two cards together In this application the DUTs are connected to the bank inputs on the multiplexer card allowing a large num ber of DUTs to be switched through the matrix card Also the instruments are connected to the columns on the matrix card This particular configuration is best suited for applications requiring a large number of DUTS to be connected to several instruments In other cases the test configuration may call for a large num ber of instruments and few DUTs In those situations the instruments would be connected to the multiplexer inputs and t
69. ich shows how to use the Model 7011 with a matrix card Model 7012 4 4 1 Resistor testing The Model 7011 can be used to test a large number of resistors using only one test instrument or group of in struments Such tests include two wire and four wire resistance measurements using a DMM and low resis tance measurements using a current source and sensi tive digital voltmeter as discussed in the following paragraphs Two wire resistance tests Figure 4 4 shows a typical test setup for making two wire resistance measurements The Model 7011 card provides the switching function while the resistance measurements are made by a Model 199 DMM Since only two pole switching is required for this applica tion one Model 7011 card can be used to switch up to 40 resistors additional multiplexer banks can be add ed if desired by adding more cards Accuracy of measurements can be optimized by mini mizing stray resistance Make connecting wires as short as possible to mini mize path resistance Another technique is to short one of the multiplexer inputs close the shorted channel and then enable the DMM zero feature to cancel path resistance Leave zero enabled for the entire test 4 5 Operation wg 4 MODEL 199 fo DMM Single 1x40 MUX DUTs 49 Test Configuration px 1 E
70. l All other instru ments signal terminals are Installation Category I and must not be connected to mains Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sources NEVER connect switching cards directly to AC mains When con necting sources to switching cards install protective devices to lim it fault current and voltage to the card Before operating an instrument make sure the line cord is connect ed to a properly grounded power receptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks before each use For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting cables or jump ers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Always make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured Do not exceed the maximum signal levels of the instruments and cessories as defined in the specifications and operating informa tion and as shown on the instrument or test fixtu
71. l 617 press SUPPRESS to cancel offset current then enable zero check WARNING The following steps use high voltage 100V Be sure to remove power from the circuit before making con nection changes 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 Program the Model 7001 to close Channels 1 1 and 1112 Bank A Input 1 and Bank B Input 2 Bank Inputs Note Setup shown is configured L iian Pena ion between to test isolation Bank A and Bank B Figure 5 4 Bank isolation test connections Model 7011 11 12 13 14 15 16 17 18 19 20 21 On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to set tle verify that it is gt 1GQ 1020 This measurement is the leakage resistance bank isolation between Bank A Input 1 and Bank B Input 2 Place the Model 617 voltage source in standby and enable zero check Turn off the Model 7001 and move the electrometer connections to Banks B and C Install the Model 7011 in slot 1 of the mainframe and turn the Model 7001 on Program the Model 7001 to close Channels 1112 and 1123 Bank B Input 2 and Bank C Input 3 On the Model 617 disable zero check and press OPERATE to source 100V After all
72. l 7025 Keithley Model 1484 the side edges Do not touch the con nectors and do not touch the board surfaces or components On plugs and receptacles do not touch areas adjacent to the electrical contacts NOTE Failure of any performance verifica tion test may indicate that the multi plexer card is contaminated See para graph 5 2 to clean the card 5 3 1 Environmental conditions All verification measurements should be made at an ambient temperature between 18 and 28 C and at a relative humidity of less than 70 5 3 2 Recommended equipment Table 5 1 summarizes the equipment necessary for per formance verification along with an application for each unit 300Q 0 01 Path resistance 10pA 100pA Offset current path isola 1 6 100V source tion 0 2 3mV 60ppm Offset current Contact potential Contact potential 5 3 3 Multiplexer card connections The following information summarizes methods that can be used to connect test instrumentation to the two connector cards Detailed connection information is provided in Section 3 Model 7011 S Instrumentation can simply be hard wired directly to the screw terminals of the connector card Jumper wires should be kept as short as possible Model 7011 C One method to make instrument con nections to the multiplexer card is by hard wiring a 96 pin female DIN connector then mating it to the connec tor on the Model 7011 C Inpu
73. lowing para graphs discuss these effects and ways to minimize them Operation 4 5 1 Path isolation The path isolation is simply the equivalent impedance between any two test paths in a measurement system Ideally the path isolation should be infinite but the ac tual resistance and distributed capacitance of cables and connectors results in less than infinite path isola tion values for these devices Path isolation resistance forms a signal path that is in parallel with the equivalent resistance of the DUT as shown in Figure 4 12 For low to medium device resis tance values path isolation resistance is seldom a con sideration however it can seriously degrade measure ment accuracy when testing high impedance devices The voltage measured across such a device for exam ple can be substantially attenuated by the voltage di vider action of the device source resistance and path isolation resistance as shown in Figure 4 13 Also leak age currents can be generated through these resistanc es by voltage sources in the system G al E DUT MUX Measure Card Instrument Source Resistance of DUT Source EMF of DUT Path Isolation Resistance Input Resistance of Measuring Instrument Figure 4 12 Path isolation resistance 4 15 Operation Rour R PATH Rpa Eour Rour Ream Figure 4 13 Voltage attenuation b
74. lowing the reading on the Model 617 to set tle verify that it is gt 1GQ 10 Q This measurement is the differential leakage resistance isolation of Bank A Place the Model 617 in standby and enable zero check Bank Inputs Ux re Model 7011 12 19 14 15 16 17 18 19 Program the Model 7001 to close Channel 111 Bank A Input 1 On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to set tle verify that it is also gt 1GQ 10 Q This measure ment checks the differential isolation of Input 1 Using Table 5 4 as a guide repeat the basic proce dure in steps 11 through 14 to test Inputs 2 through 10 of Bank test numbers 3 through 11 of the ta bie Use Table 5 4 test numbers 12 through 42 and the above procedure to test Banks B C and D Place the Model 617 voltage source in standby and enable zero check NOTE Refer to Figure 5 7 for the following procedure to check common mode isolation Turn off the Model 7001 and connect the electrom eter to the Model 7011 as shown in Figure 5 7 Repeat steps 4 through 16 to check common mode isolation Verify that each reading is gt 1GQ 1090 Service information Table 5 4 Differential and common mode isolation testing Test Differential or com number mon mode isolation 1 Bank A Bank A Input 1 11 Bank
75. m Keeping connectors Era suu Su Su Handling and cleaning precautiona iuusus Performance verification cccscssccessssssceseatscorencecosessecesssensersensecsurssusesesstssceucestensenneasseseesensteseseenecesssenterseed Environmental conditions Recommended esa EO Multiplexer card connections Channel resistance tests hen Offset current tests rire a w censeo pane cep eee ege asawa eee eee Contact potential dle usse tnra d pesi Godin e Patin pore Bank and channel to channel isolation tests Differential and common mode isolation tests Special handling of static sensitive devices iuc trastero u u eR TUR Block diagrama was D data circuits
76. made at inputs 1 and 10 of Bank A as shown in Figure 5 1 Connect OHMS LO and OHMS SENSE LO to the Hi H terminal of Bank A Install the Model 7011 in slot 1 CARD 1 of the Model 7001 Turn on the Model 7001 and program it to close Channel 111 Bank A Input 1 Verify that the resis tance of this path is lt 1Q Open Channel 1 1 and close Channel 112 Bank A Input 2 Verify that the resistance of this path is 1 Using the basic procedure in steps 9 and 10 check the resistance of Bank A HI H terminal paths for Inputs 3 through 10 Channels 1 3 through 110 Turn off the Model 7001 and move the OHMS LO and OHMS SENSE LO test leads to the LO L ter minal of Bank A Repeat steps 9 through 11 to check the LO L ter minal paths of Bank A Channels 1 1 through 1110 Repeat the basic procedure in steps 1 through 13 for Banks B through D Channels 111 through 1140 5 3 Service information Sense LO Note Connections set up to test Bank A HI Figure 5 1 Path resistance test connections 5 4 Bank Inputs Model 7011 5 3 5 Offset current tests These tests check leakage current between HI H and LO L differential offset current and from HI H and LO L to chassis common mode offset current of each pathway In general these tests are performed by simply measuring the leakage current with an elec trometer In the following procedure the Model 617 is used to me
77. minals of one of the bank inputs then close the relay Enable zero the Model 196 then select off set compensated ohms Operation lees Duat 1x20 MUX Note Jumpers between Banks B and C are removed A Test Configuration peu o0 HI Ohms Sense Hi Simplified Equivalent Circuit Figure 4 5 Four wire resistance testing 4 7 Operation Low level resistance measurements Many times it is necessary to make resistance mea surements with either lower voltage sensitivity or higher currents than are available with ordinary DMMs Examples of cases where low level resistance measurements may be necessary include the testing of PC board traces contacts bus bars and low resistance shunts Figure 4 6 shows a typical test configuration for a switching system capable of testing a number of low resistance devices The Model 220 Current Source forc es current through the device under test while the Model 182 Sensitive Digital Voltmeter measures the re sulting voltage across the device Since low voltage levels are being measured thermal EMF offsets generated by relay and connector contacts will have a detrimental effect on measurement accura cy unless steps are taken to avoid them the Model 7011 has been designed to keep relay EMF at a minimal lev el Thermal EMF effects can be virtually eliminated by taking two voltage measurements and E the first with the current L flowing i
78. n handling Handling Precautions 1 Always grasp the card by the side edges and shields Do not touch the board surfaces or components 2 When not installed in a Model 7001 mainframe keep the card in the anti static bag and store it in the original 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 1 7 2 Shipping contents The following items are included with every Model 7011 order Model 7011 Quad 1 x 10 Multiplexer Card Model 7011 Instruction Manual Additional accessories as ordered 1 7 3 Instruction manual The Model 7011 Instruction Manual is three hole drilled so that it can be added to the three ring binder of the Model 7001 Instruction Manual After removing the plastic wrapping place the manual in the binder following the mainframe instruction manual Note that a manual identification tab is included and should pre cede the multiplexer card instruction manual If an additional instruction manual is required order the manual package Keithley part number 7011 901 00 The manual package includes an instruction manu al and any pertinent addenda 1 7 4 Repacking for shipment Should it become necessary to return the Model 7011 for repair carefully pack the unit in its original packing carton or the equivalent and include the following in formation Advise as to the warr
79. n one direction and the second with a current I of the same magnitude flow ing in the opposite direction The resistance can then be calculated as follows iU Note that simply reversing the current source polarity will result in a 2X accuracy specification change To avoid this problem matrix switching could be added to the test system to reverse the current See paragraph 4 4 3 182 Nanovoltmeter DANT 220 Currrent Source Figure 4 6 Low resistance testing 4 4 2 Transistor testing Typical transistor tests that can be performed with the aid of the Model 7011 include current gain tests leak age tests as well as tests to determine the common emitter characteristics of the device The following paragraphs discuss these tests and give typical equip ment configurations for the tests Current gain tests The DC or static common emitter current gain of a transistor can be determined by biasing the transistor for a specific value of base current Ip and then mea suring the collector current Ic The DC common emit ter current gain B of the transistor is then determined as follows alan Operation Figure 4 7 shows the test configuration and equivalent circuit for the current gain test The Model 224 Current Source is used to source the base current Ip The Model 230 Voltage Source supplies the collector emitter volt age Vcr and the collector current is measured by the Model 1
80. nd allow the unit to warm up to achieve rated accuracy Place a short between HI to LO on each input Channels 1 40 Place a short between HI to LO on output Bank D long enough to cut with wire cutters Connect the Model 182 input leads to HI and LO output Bank A using copper wires Model 1484 Low Thermal Cable Unterminated Model 182 Note Setup shown is configured to test Bank A thru D relays for contact potential Figure 5 3 Contact potential test connections 11 12 13 14 15 16 17 Service information Install the Model 7011 in the Model 7001 slot 1 and turn the Model 7001 on Allow Models 7001 7011 and 182 to warm up for two hours Select the 3mV range the Model 182 10 Press REL READING on the Model 182 to null out internal offsets Leave REL READING enabled for the entire procedure Turn the Model 7001 off Remove the Model 7011 from slot 1 Cut the short on B and D output HI to LO Install the Model 7011 in the Model 7001 siot 1 and turn power on Wait 15 minutes Program the Model 7001 to close Channel 111 After settling verify that reading on the Model 182 is 500nV for the Model 7011 S This measure ment represents the contact potential of the path way From the Model 7001 open Channel 111 Repeat steps 12 through 14 for all 40 channels Bank inputs Low thermal short Ctean high purity copper 1 of 40 Model 7011 5
81. nection schemes for the multi pin connector card use some of the techniques presented in paragraph 3 3 2 Keep in mind that these are only examples to demonstrate var ious ways to wire a test system Connection details for both connector cards multi pin and screw terminal connector cards are provided in paragraph 3 3 3 41 Single card system Figure 3 12 shows how external connections can be made to a single card system that uses the multi pin connector card This single card system is configured as two 1 x 20 multiplexers To accomplish this the ap propriate bank to bank jumpers must be installed to connect Banks A and B together and Banks C and D to gether Instrumentation and DUTs are hard wired to the Mod el 7011 MTR male bulkhead connector This connector has solder cups that will accept wire size up to 24 AWG The test system is connected to the multiplexer Card Connections amp Installation using the Model 7011 MTC 2 round cable assembly This cable mates directly to both the external bulkhead connector and the Model 7011 C multiplexer card as sembly Notice that the bulkhead connector is shown mounted to a fixture to help keep the cabling stable during the test The single card system in Figure 3 13 is identical to the system in the previous illustration except for the con nection scheme The system in Figure 3 13 uses the screw terminal connector card With this card single conductor connections are made directly
82. nframe on Program the Model 7001 to close Channel 112 Bank A Input 2 Make sure ail other channels are open On the Model 617 disable zero check and press OPERATE to source 100V After allowing the reading on the Model 617 to set tle verify that it is gt 1GQ 1090 Place the Model 617 voltage source in standby and enable zero check Using Table 5 3 as a guide perform tests 2 through 9 for the remaining Bank A Inputs Remember to move Bank Input connections as indicated in the table Use Table 5 3 test numbers 10 through 36 and the above procedure to test Banks B C and D 11 and 1112 1112 and 1123 1123 and 1124 1124 and 1135 1125 and 1136 1126 1137 1127 and 1138 1128 and 1139 1129 and 1140 Assumes Model 7011 installed in slot 1 of mainframe Programmed as slot 1 and channel Service information Model 7025 Unterminated Banana to Banana Cable Triax Cable d x Bank Inputs Z 8 4 5 6 7 8 9 410 21 Soueevens 7 Measure VA Bank outputs Model 617 Unterminated Banana Cables Note Setup shown is configured L 1 to test isolation between w S k a ii m s Model 7011 Figure 5 5 Channel to channel isolation test connections 5 10 Service information Table 5 3 Channel to channel isolation test summary Test Channel to channel isolation Test e
83. ng and measuring circuits a good distance away from these potential noise sources At high current levels even a single conductor can gen erate significant fields These effects can be minimized by using twisted pairs which will cancel out most of the resulting fields 4 5 3 Radio frequency interference RFI Radio Frequency Interference is a general term used to describe electromagnetic interference over a wide range of frequencies across the spectrum Such RFI can be particularly troublesome at low signal lev els but is can also affect measurements at high levels if the problem is of sufficient severity RFI can be caused by steady state sources such as radio or TV signals or some types of electronic equipment microprocessors high speed digital circuits etc or it can result from impulse sources as in the case of arcing in high voltage environments In either case the effect on the measurement can be considerable if enough of the unwanted signal is present RFI can be minimized in several ways The most obvi ous method is to keep the equipment and signalleads as far away from the RFI source as possible Shielding the switching ard signal leads sources and measur ing instruments will often reduce RFI to an acceptable level In extreme cases a specially constructed screen room may be required to sufficiently attenuate the troublesome signal Many instruments incorporate internal filtering that may help to reduce RF
84. nnect multiplexer banks together to form a multiplexer of 1 x 40 Each jum lt set connects two adjacent banks to gether These j nper sets are included with the Model 7011 The bank to bank jumpers allow you to configure the multiplexer card in a variety of ways Typical multi plexer configurations include Four1x10 r ltiplexers no jumpers installed Fig ure 2 2 2 2 3 10 10 10 PEN Ee Jumpers to 7001 Analog Backplane Bank to Bank Jumpers Note Factory Configuration shown Two 1 x 20 multiplexers Bank A jumpered to Bank B Bank C jumpered to Bank D Figure 2 3 One 1 x 40 multiplexer all bank to bank jumpers installed Figure 2 4 Other combinations are possible including rnultiplex ers of various sizes in multiples of 10 channels For example you could install jumpers to configure the card as one 1 x 30 and one 1 x 10 multiplexer Refer to Section 3 for information on installing bank to bank jumpers Multiplexing Basics inputs 1 10e 9 e Bank A Output A 1 Bank B Output 10 1 2 M 2 9 109 2 1 2 9 100 620 Output Bank D Output D Figure 2 2 Four 1 x 10 multiplexer configuration jumpers not installed inputs 1 22 idi 2 9 Output A 10 ot a Bank B Jumpers Bank C Output C Bank D Jumpers Figure 2 3 Two
85. ns amp Installation 3 1 Introduction WARNING The procedures in this section are in tended only for qualified service per sonnel Do not perform these procedures unless qualified to do so Failure to recognize and observe nor mal safety precautions could result in personal injury or death The information in this section is arranged as follows 3 2 Handling precautions Explains precautions that must be followed to prevent contamination to the multiplexer card assembly Contamination could degrade the performance of the multiplexer card 3 3 Connections Covers the basics for connecting external circuitry to the two available connector cards for the multiplexer the screw terminal con nector card and the multi pin connector card 3 4 Typical connection schemes Provides some typ ical connection schemes for single card two card and two mainframe system configurations 3 5 Model 7011 installation Provides a procedure to install the multiplexer card assembly in the Model 7001 mainframe 3 2 Handling precautions To maintain high impedance isolation care should be taken when handling the relay card to avoid contami nation from such foreign materials as body oils Such contamination can substantially lower leakage resis tances thus degrading performance To avoid possible contamination always grasp the re lay and connector cards by the side edges or shields Do not touch the board surfaces or components On conne
86. o Riti o r moooc e eoo cT i R 9989 par m o i i e o gEttd o 0 mooo e 5 Tits so o T mae 7 mooo NO 801M 737915 2 TOTA 3 033 WSSHded 91 X0v v E 01 8011 TIGISNT OL 04 X03 1 9 G 5322 Hdd G T ABUNIWI 138d 8 219 94 03999 95 2 0313130 43593 38 026016 311 S9NIMSUSO STHL 661 OIHO ense STA THI To INI SINSWNYLSNI AS3HAII3X A3 THI TS 31925 LON 09 cata zoro coooooo amp o pucr cote zorn ocooocoo loooccococ aM c Tooooc E se 9 153 coocoo gooo moooc 89 9981 i rera asta 59000 moooc 1 orta f Stim feoood 22994 000090 zera POT sorw Bo oc 50909 ooool Jon 541 2004 ATT SISSUHO 40 1 Oi TONIWS3LI 39613100 NV NOIiDnUJ
87. odel 7001 analog backplane 2 5 Multiplexing Basics Figure 2 6 shows how each bank of the Model 7011 is connected to the backplane Notice that since the Mod el 7011 is a two pole card there is no connection made to the Guard terminal of the backplane The Model 7011 is shipped from the factory with the backplane jumpers installed Removing cutting the backplane jumpers isolates the card from the backplane and subsequently any card installed in the other slot For information on removing the jumpers refer to Section 3 NOTE The Model 7001 does not provide an analog backplane for the non 701X se ries cards s a result any of these cards installed in one slot in the main frame is electrically isolated from any card installed in the other slot The only way to connect a Model 7011 to one of these cards is to wire them to gether 7011 7001 Bank Analog 1 of 4 Backplane kl cT sut Hu ecu eeu H High Backplane 2227 Jumpers G Guard ump Figure 2 6 Bank connections to backplane 2 3 Typical multiplexer switching schemes The following paragraphs describe some basic switch ing schemes that are possible with a two pole switch ing multiplexer These switching schemes include some various shielding configurations to help mini mize noise pick up in sensitive measurement applica tions These shields are shown connected to chassis ground For some test configurations shi
88. on nector card Keithley offers a variety of optional acces sories that can be used to make connections to the connector card see paragraph 1 9 The rest of Section 1 is arranged in the following man ner 1 2 Features 13 Warranty information 14 Manual addenda 1 Safety symbols and terms 16 Specifications 17 Unpacking and inspection 18 Repacking for shipment 19 Optional accessories 1 2 Features The Model 7011 is a low voltage two pole quad 1 x 10 multiplexer card Some of the key features include Low contact potential and offset current for mini mal effects on low level signals The connector board detaches from the relay board allowing easy access to the screw terminals Model 7011 S and jumpers Easy jumper configuration of one two three or four multiplexer banks Backplane jumpers Cutting jumpers disconnects multiplexer bank outputs from the Model 7001 an alog backplane General Information 1 3 Warranty information Warranty information is located on the inside front cover of this instruction manual Should your Model 7011 require warranty service contact the Keithley rep resentative or authorized repair facility in your area for further information When returning the multiplexer 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 o
89. onnector Schem Connector Schem Mux Desig Desig Mux Desig Desig Mux Desig Desig Mux Desig Desig Terminai 1 32 1 96 Terminal 1a 32c 1 96 Terminal 1 32 1 96 Terminal 1 32 1 96 Bank Bank D Inputi 32c 96 Input HI 24 88 inputi Hi 166 80 input1 8c 72 LO 32b 64 LO 24b 56 16b 48 LO 8b 40 Input2 32a 32 Input2 HI 24a 24 input2 HI 16a 16 Hi 8a 8 31c 95 230 87 15 79 7 71 input3 31b 63 InputS HI 23b 55 15b 47 Input3 7b 39 LO 31a 31 LO 23a 23 LO 15a 15 7a 7 Input4 30 94 Input4 22 86 4 14c 78 input4 6c 70 LO 30b 62 LO 22b 54 LO 14b 46 LO 6b 38 Input5 30a 30 5 22a 22 5 HI 14a 14 InputS 6a 6 10 29 93 LO 21c 85 LO 13 77 5c 69 29b 61 21b 53 inpute 13b 45 5b 37 298 29 21a 21 LO 13a 13 LO 5a 5 Input7 HI 28 92 input7 Ht 20 84 7 12 76 HI 4 68 280 60 20b 52 LO 120 44 4b 36 inpute HI 28a 28 jinputs 20a 20 Hi 12a 12 4a 4 LO 27 91 LO 19 83 LO tte 75 LO 3c 67 input9 HI 27b 59 Input9 19b 51 Input9 HI Tib 43 jinput9 30 35 LO 27a 27 LO 19a 19 LO tta 11 3a 3 Input 10 26 90 Input 10 18c 82 Input 10 10 74 Input 10 2 66 LO 26b 58 LO 180 50 LO 10b 42 LO 2b 34 Output HI 26a 26 Output Hi
90. owing the reading on the Model 617 to set tle verify that it is gt 1GQ 10 PQ Place the Model 617 voltage source in standby and enable zero check Turn off the Model 7001 and move the electrometer connections to Banks C and D Install the Model 7011 in slot 1 of the mainframe and turn the Model 7001 on Using Table 5 2 as a guide repeat the basic proce dure of steps 16 through 18 for the rest of the path pairs test numbers 3 through 9 in the table Table 5 2 Bank isolation test summary Bank A Input 1 to Bank B Input 2 Bank B Input 2 to Bank C Input 3 Bank C Input 3 to Bank D Input 4 Bank C Input 4 to Bank D Input 5 Bank C Input 5 to Bank D Input 6 Bank Input 6 to Bank D Input 7 Bank C Input 7 to Bank D Input 8 Bank C Input 8 to Bank D Input 9 Bank C Input 9 to Bank D Input 10 N Ui N 23 24 26 27 28 29 31 Test Bank A and Bank B Bank B and Bank C Bank C and Bank D Bank C and Bank D Bank C and Bank D Bank C and Bank D Bank C and Bank D Bank C and Bank D Bank C and Bank D Service information Place the Modei 617 voltage source in standby and enable zero check NOTE Refer to for the following procedure to check channel to channel isolation Turn off the Model 7001 and connect the Model 617 to the card as shown in Figure 5 5 Install the Model 7011 in slot 1 of the Model 7001 and turn the mai
91. pulse occurs a low logic level is clocked into the D type flip flop setting Q out low and enabling all relay drivers simultaneously Note that Q out stays low en abling relay drivers until the 68302 processor goes into a reset condition 5 6 Troubleshooting 5 6 1 Troubleshooting equipment Table 5 5 summarizes recommended equipment for troubleshooting the Model 7011 Table 5 5 Recommended troubleshooting equipment Manufacturer Description and model Application Keithley 196 Measure DC voltages View logic waveforms Service Information 5 6 2 Troubleshooting access In order to gain access to the relay card top surface to measure voltages under actual operation conditions perform the following steps 1 Disconnect the connector card from the relay card 2 Remove the Model 7001 cover 3 Install the relay card in the CARD 1 slot location 4 Turn on Model 7001 power to measure voltages see following paragraph 5 6 3 Troubleshooting Procedure Table 5 6 summarizes switch card troubleshooting WARNING Lethal voltages are present within the 7001 mainframe Some of the pro cedures may expose you to hazard ous voltages Observe standard safety precautions for dealing with live circuits Failure to do so could re sult in personal injury or death CAUTION Observe the following precautions when troubleshooting or repairing the switch card To avoid contamination which could degrade card perfo
92. quipment location Channel closed Bank C Input 9 to Bank C Input 10 Bank D Input 1 to Bank D Input 2 Bank D Input 2 to Bank D Input 3 Bank D Input 3 to Bank D Input 4 Bank D Input 4 to Bank D Input 5 Bank D Input 5 to Bank D Input 6 Bank D Input 6 to Bank D Input 7 Bank D Input 7 to Bank D Input 8 Bank D Input 8 to Bank D Input 9 Bank D Input 9 to Bank D Input 10 Bank C and Input 9 Bank D and Input 1 Bank D and Input 2 Bank D and Input 3 Bank D and Input 4 Bank D and Input 5 Bank D and Input 6 Bank D and Input 7 Bank D and Input 8 Bank D and Input 9 Assumes Model 7011 installed in slot 1 of mainframe Programmed as slot 1 and channel 1 Bank A Input 1 to Bank A Input 2 Bank A and Input 1 2 Bank A Input 2 to Bank A Input 3 Bank A and Input 2 3 Bank A Input 3 to Bank A Input 4 Bank A and Input 3 4 Bank A Input 4 to Bank A Input 5 Bank A and Input 4 5 Bank A Input 5 to Bank A Input 6 Bank A and Input 5 6 Bank A Input 6 to Bank A Input 7 Bank A and Input 6 7 Bank A Input 7 to Bank A Input 8 Bank A and Input 7 8 Bank A Input 8 to Bank A Input 9 Bank A and Input 8 119 9 Bank A Input 9 to Bank A Input 10 Bank A and Input 9 1110 Bank B Input 1 to Bank B Input 2 Bank B and Input 1 112 Bank B Input 2 to Bank B Input 3 Bank B and Input 2 103 Bank B Input 3 to Bank B Input 4 Bank B and Input 3
93. r changes concerning the multi plexer card or manual will be explained in an adden dum included with the card Addenda are provided in a page replacement format Simply replace the obsolete pages with the new pages 1 5 Safety symbols and terms The following symbols and terms may be found on an instrument or used in this manual The A symbol on an instrument indicates that the user should refer to the operating instructions located in the instruction manual The symbol on an instrument shows nigh voltage may be present on the terminal s stan dard safety precautions to avoid personal contact with these voltages The WARNING heading used in this manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading used in this manual explains hazards that could damage the multiplexer card Such damage may invalidate the warranty 1 2 1 6 Specifications Model 7011 specifications are found at the front of this manual These specifications are exclusive of the mul tiplexer mainframe specifications 1 7 Unpacking and inspection 1 7 1 Inspection for damage The Model 7011 is packaged in a re sealable anti static bag to protect it from damage due to static discharge and from contamination that could degrade its perfor mance Before removing the card from the bag observe the following precautions o
94. r wire Keithley P N J 15 and solder it to the PC board 4 Remove the solder flux from the PC board The cleaning procedure is explained in paragraph 5 2 7011 Relay Card gt gt umpers Ew Figure 3 4 Backplane jumpers 3 3 3 Screw terminal connector card The screw terminal connector card is shown in Figure 3 5 Connections are made directly to the screw termi nals of the twelve terminal blocks Each screw terminal will accommodate 16 22 AWG wire 3 4 WARNING KETTHLEY toot USER SUPPLIED LETHAL VOLTAGES MAY IN BE PRESENT ON CONNECTORS OR PC BOARD 761 162 040 BANK 8 QUTPUT e DUTPUT r u u Pm ETE tox esr H t H L H L Li L oooooco MAX VOLTAGE TERMINAL TD TERMINAL OR CHASSIS 110 0C OR 175U9RC PEAK Figure 3 5 Model 7011 screw terminal connector card Card Connections amp installation Wiring procedure 16 22 AWG Wires Perform the following procedure to wire circuitry to the screw terminal connector card Bank A WARNING Make sure all power is off and any stored energy in external circuitry is discharged 1 Ifmated together separate the connector card from the relay card by removing the mounting screw and pulling the two cards away from each other Remember to only handle the cards by the edges and shields to avoid contamin
95. re panels or switching card When fuses are used in a product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is ap plied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The JS symbol on an instrument indicates that the user should re fer to the operating instructions located the manual The AN symbol on an instrument shows that it can source or mea sure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety precautions to avoid personal contact with these voltages The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated infor mation very carefully 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 shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains cir
96. rmance always handle the card only by the handle and side edges Do not touch edge comnectors board surfaces or com ponents on the card Also do not touch areas adjacent to electrical con tacts on connectors Use care when removing relays from the PC board to avoid pulling traces away from the circuit board Before attempting to remove a relay use an appropriate de soldering tool such as a solder sucker to clear each mounting hole completely free of solder Each relay pin must be free to move in its mounting hole before re moval Also make certain that no burrs are present on the ends of the relay pins Service information Table 5 6 Troubleshooting procedure GND pad voltages referenced to digital ground GND pad 2 6V pad 6 Relay voltage 3 5V pad 5VDC Logic voltage 4 14 6V pad 14 6VDC Relay bias voltage 5 V pad 3 5VDC Regulated relay voltage 6 U105 pin 5 ID CLK pulses During power up only 7 U105 pin 6 ID DATA pulses During power up only 8 U100 pin 7 STROBE pulse End of relay update sequence 9 U100 pin 2 CLK pulses During relay update sequence only U100 pin 3 DATA pulses During relay update sequence only U100 U104 pins 10 18 Low with relay energized Relay driver outputs high with relay de energized 43 5VDC present at V pad under steady state conditions This voltage rises to 5 7VDC for abou
97. s elements are discussed in the following paragraphs 5 5 2 ID data circuits Upon power up card identification information from each card is read by the mainframe This ID data in cludes such information as card ID hardware settling time and relay configuration information To Mainframe To Mainframe ID DATA 46V 14 6V Figure 5 8 Model 7011 block diagram Service Information ID data is contained within an on card EEPROM U105 In order to read this information the sequence described below is performed on power up 1 TheIDDATA line pin 6 of U105 is set from high to low while the IDCLK line pin 5 of U105 is held high This action initiates a start command to the ROM to transmit data serially to the mainframe Figure 5 9 2 The mainframe sends the ROM address location to be read over the IDDATA line The ROM then transmits an acknowledge signal back to the main frame and it then transmits data at that location back to the mainframe Figure 5 10 3 The mainframe then transmits an acknowledge signal indicating that it requires more data The ROM will then sequentially transmit data after each acknowledge signal it receives 4 Once all data is received the mainframe sends a stop command which is a low to high transition of the IDDATA line with the IDCLK line held high see Figure 5 9 User connections 3 5 Steady State 5 7 100 msec during relay actuation Relay Power Control
98. setup 4 5 5 Keeping connectors clean As is the case with any high resistance device the in tegrity of connectors can be damaged if they are not handled properly If connector insulation becomes con taminated the insulation resistance will be substantial ly reduced affecting high impedance measurement paths Oils and salts from the skin can contaminate connector insulators reducing their resistance Also contami nants present in the air can be deposited on the insula tor surface To avoid these problems never touch the connector insulating material In addition the multi plexer card should be used only in clean dry environ ments to avoid contamination If the connector insulators should become contaminat ed either by inadvertent touching or from air borne deposits they can be cleaned with a cotton swab dipped in clean methanol After thoroughly cleaning they should be allowed to dry for several hours in a low humidity environment before use or they can be dried more quickly using dry nitrogen 4 5 6 AC frequency response The AC frequency response of the Model 7011 is impor tant in test systems that switch AC signals Refer to the specifications at the front of this manual 4 17 Service Information WARNING The information in this section is in tended only for qualified service per sonnel Some of the procedures may expose you to hazardous voltages that could result in personal injury or death
99. st Fixture 7007 1 _ Card 1 140 I Notes 1 Backplane jumpers for both cards installed in 7001 1 must be installed 2 All bank to bank jumpers on atl three cards must be installed 7001 Analog Backplane Card t 1x40 peo Single 1x120 Multipiexer Simplified Equivalent Circuit Figure 3 16 Two mainframe system example multi pin connector card Card Connections amp Installation DUT Test Fixture Cable 244 Individual Conductors 22 AWG 40 DUT Test Fixture Notes 1 Backplane jumpers for both cards installed in 7001 1 must be installed 2 All bank to bank jumpers on all three cards must be installed Connections Card 1 1x40 Single 1x120 Muttiplexer Simplified Equivalent Circuit Figure 3 17 Two mainframe system example screw terminal connector cara 3 18 3 5 Model 7011 installation and re moval This paragraph explains how to install and remove the Model 7011 multiplexer card assembly from the Model 7001 mainframe WARNING Installation or removal of the Model 7011 is to be performed by qualified service personnel Failure to recog nize and observe standard safety pre cautions could result in personal injury or death NOTE If using the screw terminal connector card make sure your external circuit ry is wired to the card as explained in paragraph 3 3 1 before installing the card assembly in the Model 7001 mainfr
100. t 100msec when relay configuration is changed 5 19 Replaceable Parts 6 1 Introduction This section contains replacement parts information schematic diagrams and component layout drawings for the Model 7011 6 2 Parts lists Parts lists for the various circuit boards are included in tables integrated with schematic diagrams and corapo nent layout drawings for the boards Parts are listed al phabetically in order of circuit designation 6 3 Ordering information To place an order or to obtain information concerning replacement parts contact your Keithley representa tive or the factory see inside front cover for addresses When ordering parts be sure to include the following information mn Card model number 7011 Card serial number Part description Circuit description if applicable Keithiey part number 6 4 Factory service If the card is to be returned to Keithley Instruments for repair perform the following 1 Complete the service form at the back of this man ual and include it with the card 2 Carefully pack the card in the original packing car ton 3 Write ATTENTION REPAIR DEPT on the shipping label Note It is not necessary to return the matrix main frame with the card Replaceable Parts 6 5 Component layouts and schematic diagrams Component layout drawings and schematic diagrams are included on the following pages integrated with the parts lists
101. t and output shorting connections can also be done at the connector The con nector in the Model 7011 KIT R connection kit see Ta ble 3 2 can be used for this purpose Pin identification for the connector is provided by Figure 3 8 CAUTION After making solder connections to a connector remove solder flux as ex plained in paragraph 5 2 Failure to clean the solder connections could result in degraded performance pre venting the card from passing verifi cation tests Before pre wiring any connectors or plugs study the following test procedures to fully understand the con nection requirements 5 3 4 Channel resistance tests Perform the following steps to verify that each contact of every relay is closing properly and that the resis tance is within specification 10 1 12 13 14 Service Information Turn the Model 7001 off if it is on Turn on the Model 196 and allow it to warm up for one hour before making measurements Connect all input terminals of Bank A together to form one common terminal as shown in Figure 5 1 Set the Model 196 to the 300Q range and connect the four test leads to the OHMS and OHMS SENSE input jacks Short the four test leads together and zero the Model 196 Leave zero enabled for the entire test Connect OHMS HI and OHMS SENSE HI of the Model 196 to the common terminal jumper on Bank A inputs It is recommended that the physi cal connections be
102. uired as shown in Figure 4 11 ration Backplane Jumpers Made 224 Current Source L 2 A gt 2 Rows I 21 gt lt I i i 1 2 4 5 6 7 8 1 See em ea Sampies Under 7011 MUX 7001 Analog Columns Test Card Backplane 7012 Matrix Card A Connections 7012 Matrix 7012 Matrix Card Card B Simplified Equivalent Circuit One measurement leg shown Figure 4 10 Resistivity t si configuration 4 13 Operation Figure 4 11 Measurement required for resistivity test 4 14 Once the measurements have been taken the resistivi ty can be calculated Two values of resistivity A and B are initially computed as follows 1133 1 V V V V DI IDEM 1 1331fgtg Vg Vg Vs V4 B 1 Where and are the resistivities in Q cm tg is the sample thickness cm V4 through Vg are the voltages measured by the Model 196 115 the current through the sample in amperes fa and fg are geometrical factors based on sample sym metry f4 fg 1 for perfect symmetry Once and og are known the average resistivity Can be determined as follows 4 5 Measurement considerations Many measurements made with the Model 7011 are subject to various effects that can seriously affect low level measurement accuracy The fol
103. wo Model 7001 mainframes to configure a single 1 x 120 multiplexer 3 14 system Each card is configured as a single 1 x 40 mul tiplexer To accomplish this bank to bank jumpers of W three cards must be installed to connect Banks A B C and D together By leaving the backplane jumpers of the cards in main frame 1 installed the banks of Card 1 are connected to the banks of Card 2 through the analog backplane of the Model 7001 mainframe resulting in a 1 x 80 config uration External bank connections from the instru ment to the card in the second mainframe connect the banks of all three cards together to form the 1 x 120 multiplexer system This system is similar to the Two card System see previous paragraph except that a third multiplexer card installed in a second main frame is added Figure 3 16 shows the connection scheme for the multi pin connector cards External circuit connections to the Model 7001 1 mainframe are identical to the ones used for the Two card System The third multiplexer card installed in Model 7001 2 mainframe shows how a custom built cable can be used to make connec tions to external circuitry A suitable round cable can be constructed using a 96 pin female DIN connector Model 7011 KIT R with two lengths of Hitachi cable P N N2807 P D 50TAB This cable contains 50 con ductors two lengths provide 100 conductors This ca bie will mate to the Model 7011 C multiplexer card assembly The
104. y path isolation resistance Any differential isolation capacitance affects DC mea surement settling time as well as AC measurement ac curacy Thus it is often important that such capacitance be kept as low as possible Although the distributed ca pacitance of the matrix card is generally fixed by de sign there is one area where you do have control over the capacitance in your system the connecting cables To minimize capacitance keep all cables as short as possible 4 5 2 Magnetic fields When a conductor cuts through magnetic lines of force a very small current is generated This phenomenon will frequently cause unwanted signals to occur in the test leads of a switching matrix system If the conduc tor has sufficient length even weak magnetic fields like those of the earth can creat sufficient signals to affect low level measurements Two ways to reduce these effects are 1 reduce the lengths of the test leads and 2 minimize the exposed circuit area In extreme cases magnetic shielding may be required Special metal with high permeability at low flux densities such as mu metal is effective at re ducing these effects Even when the conductor is stationary magnetically induced signals may still be a problem Fields can be 4 16 produced by various signals such as the AC power line voltage Large inductors such as power transformers can generate substantial magnetic fields so care must be taken to keep the switchi

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