Keithley 7012-S Instruction Manual
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Keithley 7012-S Instruction Manual

4x10 matrix card
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  • Page 1 (217) 352-9330 | Click HERE Find the Keithley 7012-C at our website:...
  • Page 2 Instruction Manual Models 7012-S and 7012-C 4 × 10 Matrix Cards Contains Operating and Servicing Information 7012-901-01 Rev. B / 11-93 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 3 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
  • Page 4 Models 7012-S and 7012-C Instruction Manual ©1991, Keithley Instruments, Inc. All Rights Reserved Cleveland, Ohio, U. S. A. Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 5 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, OH 44139 Technical Support: 1-888-KEITHLEY Monday – Friday 8:00 a.m. to 5:00 p.m (EST) Fax: (440) 248-6168 Visit our website at http://www.keithley.com Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 6 Addendum A (Document Number 7012-901-02) ................January 1992 Revision B (Document Number 7012-901-01).................November 1993 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...
  • Page 7 (IEC) Standard IEC 664, digital multimeter measuring circuits The types of product users are: (e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010) are Installation Category II. All other instruments’ signal terminals are Responsible body is the individual or group responsible for the use Installation Category I and must not be connected to mains.
  • Page 8 NOT as safety earth ground connections. leads, and input jacks, must be purchased from Keithley Instru- ments. Standard fuses, with applicable national safety approvals, If you are using a test fixture, keep the lid closed while power is ap- may be used if the rating and type are the same.
  • Page 9 7012 SPECIFICATIONS MODEL 7012-S 4×10 Matrix with Screw Terminals. CHANNEL RESISTANCE (per conductor): < 1Ω. MODEL 7012-C 4×10 Matrix with Mass Terminated Connector. CONTACT POTENTIAL: MATRIX CONFIGURATION: 4 rows by 10 columns. Jumpers can be 7012-S: < 500 nV per contact pair (Hi, Lo).

  • Page 10: Table Of Contents

    Table of Contents Introduction ..............................1-1 Features................................1-1 Warranty information............................. 1-2 Manual addenda ............................. 1-2 Safety symbols and terms ..........................1-2 Specifications ..............................1-2 Unpacking and inspection ..........................1-2 1.7.1 Inspection for damage ..........................1-2 1.7.2 Shipping contents............................ 1-2 1.7.3 Instruction manual..........................
  • Page 11 Introduction..............................4-1 Power limits..............................4-1 Mainframe control of matrix card ......................... 4-1 4.3.1 Channel assignments ..........................4-2 4.3.2 Front panel control ..........................4-4 4.3.3 IEEE-488 bus operation........................... 4-4 Matrix switching examples ..........................4-5 4.4.1 Thick film resistor network testing ....................... 4-5 4.4.2 Transistor testing ...........................
  • Page 12 Two-mainframe system example (multi-pin connector card) ............3-15 Figure 3-14 Two-mainframe system example (screw terminal connector card)..........3-16 Figure 3-15 Model 7012-S card installation in Model 7001 .................. 3-18 Figure 3-16 Model 7012-C card installation in Model 7001 ................. 3-19 Figure 4-1 Channel status display ...........................
  • Page 13 Figure 4-9 Common-emitter characteristics of an NPN silicon Transistor ............4-13 Figure 4-10 Path isolation resistance........................4-13 Figure 4-11 Voltage attenuation by path isolation resistance ................4-13 Figure 4-12 Power line ground loops ........................4-15 Figure 4-13 Eliminating ground loops ........................4-15 Figure 5-1 Path resistance testing..........................
  • Page 14 List of Tables Table 3-1 Mass termination accessories ........................ 3-4 Table 5-1 Verification equipment........................... 5-2 Table 5-2 Path isolation tests........................... 5-8 Table 5-3 Differential and common-mode isolation testing................5-11 Table 5-4 Recommended Troubleshooting Equipment ..................5-15 Table 5-5 Troubleshooting procedure ......................... 5-16 v/vi Artisan Scientific - Quality Instrumentation ...

  • Page 15: Introduction

    Unpacking and inspection There are two basic versions of this matrix card; the Repacking for shipment Model 7012-S and the Model 7012-C. The Model 7012- Optional accessories S assembly consists of a screw terminal connector card and the relay card. External test circuits are wired directly to the screw terminals of the connector card.

  • Page 16: Warranty Information

    Model 7012 speciÞcations are found at the front of this cover of this instruction manual. Should your Model manual. These speciÞcations are exclusive of the ma- 7012 require warranty service, contact the Keithley rep- trix mainframe speciÞcations. resentative or authorized repair facility in your area for further information.

  • Page 17: Instruction Manual

    Model 7012-ST  This screw terminal connector card following the mainframe instruction manual. Note that is identical to the one provided with the Model 7012-S a manual identiÞcation tab is included and should pre- assembly. An extra screw terminal connector card al- cede the matrix card instruction manual.

  • Page 18: Introduction

    Matrix Switching Basics Introduction Column This section covers the basics for matrix switching and is arranged as follows: To 7001 Rows Analog Backplane Basic matrix conÞguration: Covers the basic 4 × 10 matrix conÞguration. The signiÞcance of the backplane jumpers is also covered here. Backplane Crosspoint (1 of 40) Jumpers...

  • Page 19: Figure

    Matrix Switching Basics The three-pole analog backplane of the mainframe is Removing (cutting) the backplane jumpers isolates the shown in Figure 2-2. It is through this analog back- card from the backplane, and subsequently, any card plane where the rows of a Model 7012 matrix card in- installed in the other slot.

  • Page 20: Typical Matrix Switching Schemes

    Matrix Switching Basics Typical matrix switching schemes 7012 7001 Matrix Row Analog (1 of 4) Backplane The following paragraphs describe some basic switch- ing schemes that are possible with a two-pole switch- ing matrix. These switching schemes include some various shielding conÞgurations to help minimize noise pick up in sensitive measurement applications.

  • Page 21: Differential Switching

    Matrix Switching Basics 2.3.2 Differential switching 2.3.3 Sensing The differential or ßoating switching conÞguration is Figure 2-6 shows how the matrix card can be conÞg- shown in Figure 2-5. The advantage of using this con- ured to use instruments that have sensing capability. Þguration is that the terminals of the source or measure The main advantage of using sensing is to cancel the ef- fects of matrix card path resistance (<1 Ω...

  • Page 22: Smu Connections

    Thus, a switch system using as many as 12 Figure 2-7 shows how a Keithley Model 236, 237 or 238 cards in six mainframes can be conÞgured.

  • Page 23: Two Separate 4 × 10 Matrices

    Matrix Switching Basics Narrow matrix expansion (4 × 20 matrix) Separate switching systems A narrow 4 row × 20 column matrix is conÞgured by Two single-card systems can be conÞgured by remov- ing the backplane jumpers from one of the cards. The simply installing two “as shipped”...

  • Page 24: Narrow Matrix Example (4 × 20)

    Matrix Switching Basics Card 1 Card 2 7012 7012 7001 Columns Columns Analog Backplane Rows 4 x 20 Matrix Notes : Backplane jumpers on both cards must be installed. Figure 2-9 Narrow matrix example (4 × 20) Wide matrix expansion (8 × 10 matrix) could have a Model 7012 matrix card installed in one slot and a Model 7011 multiplexer card installed in the A wide 8 row ×...

  • Page 25: Figure 2-10 Wide Matrix Example (8 × 10)

    Matrix Switching Basics Card 1 Jumpers 7012 Removed Columns Rows External Column 7001 Analog Jumpers Backplane Rows 7012 Card 2 8 x 10 Matrix Figure 2-10 Wide matrix example (8 × 10) Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 26: Mainframe Matrix Expansion

    Matrix Switching Basics Card 1 Card 2 7012 7011 Columns Inputs 7001 Backplane Bank A Bank B Rows Bank C Bank D 4 x 10 Matrix Quad 1 x 10 Mux Notes : 1. Models 7011 and 7012 backplane jumpers must be installed. 2.
  • Page 27 Matrix Switching Basics An obvious advantage of a partial matrix is that fewer connected to a column of Model 7012 #1 with one “ac- matrix cards are needed. Another reason to use a par- cidental” crosspoint closure. Three speciÞc crosspoints tial matrix is to keep speciÞc devices from being con- must be closed in order to route the source signal to a nected directly to other devices.

  • Page 28: Introduction

    Card Connections & Installation Introduction Handling precautions WARNING To maintain high impedance isolation, care should be taken when handling the relay card to avoid contami- The procedures in this section are in- nation from such foreign materials as body oils. Such tended only for qualiÞed service per- contamination can substantially lower leakage resis- sonnel.

  • Page 29: Backplane Row Jumpers

    2. Physically remove a cut jumper by unsoldering it from the PC board. The following connection informa- 3. Install a new #22 AWG jumper wire (Keithley P/N tion is intended to be used by quali- J-15) and solder it to the PC board.

  • Page 30: Typical Terminal Block Connections

    Card Connections & Installation 1. If mated together, separate the connector card from the relay card by removing the mounting screw and then pulling the two cards away from each other. Remember to only handle the cards by the edges and shields to avoid contamination. 2.

  • Page 31: Multi-Pin (Mass Termination) Connector Card

    Figure 3-5. 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- Clips vices under test).

  • Page 32: Multi-Pin Connector Card Terminal Identification

    Card Connections & Installation Pins of the Model 7012-C mass termination connector can be identified in one of three ways: 1. Matrix row (1-4) or column (1-10). 2. Connector designation, 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 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 View from pin side...
  • Page 33 Round cable assemblies  Figure 3-6 shows typical Typical connection techniques round cable connection techniques using accessories available from Keithley. All external circuitry, such as instrumentation and DUTs, that you wish to connect to the matrix card must be terminated with a single 96-pin female DIN connec- In Figure 3-6A, connections are accomplished using a tor.

  • Page 34: Typical Round Cable Connection Techniques

    Card Connections & Installation Wire instrumentation Multi-Pin and DUT to bulkhead connector (See Figures Connector 3-5 and 3-7 for terminal Card identification) 7011-MTC-2 cable assembly 7011-MTR bulkhead connector Wire directly to Multi-Pin instrumentation Connector and DUT Card 7011-MTC-2 (Cut in Half) Wire directly to Multi-Pin instrumentation...

  • Page 35: Model 7011-Mtr Connector Pinout

    Card Connections & Installation View from solder cup side of connector Note : See Figure 3-5 for terminal identification. Figure 3-7 Model 7011-MTR connector pinout Figure 3-8 Model 7011-KIT-R (with cable) assembly Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 36: Typical Connection Schemes

    Card Connections & Installation Typical connection schemes switching cards. There are several ways to ensure iso- lation for a single card in the Model 7001 mainframe: The following information provides some typical con- 1. Vacate the other mainframe slot. If there is a Model nection schemes for single card, two-card, and two- 701X card installed in the other slot, remove it.

  • Page 37: Single Card System Example (Multi-Pin Connector Card)

    Card Connections & Installation 7012-C Row 1 Fixture for Instrument Bulkhead Connector Row 2 Instrument 28 Individual Conductors Row 3 Instrument Row 4 7011-MTC-2 Instrument Cable Assembly 7011-MTR Bulkhead Connector 9 10 DUT Test Fixture Rows Instruments Columns Equivalent Circuit Figure 3-9 Single card system example (multi-pin connector card) 3-10...
  • Page 38 Card Connections & Installation Row 1 Instrument Row 2 Instrument 7012-S Row 3 Instrument Row 4 Instrument 9 10 DUT Test Fixture Rows Instruments Columns Equivalent Circuit Figure 3-10 Single card system example (screw terminal connector card) 3-11 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 39 Card Connections & Installation Row 1 Note : Backplane row jumpers for Instrument both matrix cards must be installed. Row 2 Instrument 7001 7011-MTC-2 Cable Assembly 7012-C Row 3 (Cut in half to provide two cables) Instrument 7012-C Row 4 Instrument 9 10 9 10...
  • Page 40 Card Connections & Installation Row 1 Note : Backplane Instrument row jumpers for both cards must be installed. Row 2 Instrument 7001 Row 3 7012-S Instrument 7012-S Row 4 Instrument 9 10 9 10 DUT Test Fixture DUT Test Fixture 7001 Backplane...

  • Page 41: Two-Mainframe System

    Card Connections & Installation Model 7012 installation and re- 3.4.3 Two-mainframe system moval Figure 3-13 and Figure 3-14 show a system using three matrix cards in two Model 7001 mainframes to conÞg- This paragraph explains how to install and remove the ure a 4 ×...

  • Page 42: Figure

    Card Connections & Installation 7011-Kit-R DUT Test Fixture Connector Kit 9 10 7001 #2 Trigger Link 7012-C Cable 7012-C Instrument Trigger Link Cable 7001 #1 Instrument Note : Backplane 7011-MTC-2 Trigger Link 7012-C row jumpers for Cable Assembly both cards in (Cut in half to 7012-C 7001 #1 must be...
  • Page 43 Card Connections & Installation DUT Test Fixture 9 10 7001 #2 Trigger Link 7012-S Not Used Trigger Link Instrument Cable Instrument 7001 #1 Note : Backplane Trigger Link 7012-S row jumpers for Instrument both cards in 7012-S 7001 #1 must be installed.
  • Page 44 Card Connections & Installation Matrix card installation 3. Referring to Figure 3-15 for Model 7012-S installa- tion, or Figure 3-16 for Model 7012-C installation, feed the matrix card assembly into the desired slot Perform the following steps to install the matrix card...
  • Page 45 Card Connections & Installation Ejector Arms (2) Ejector Arms (2) Unlock card Unlock card Lock card Lock card Figure 3-15 Model 7012-S card installation in Model 7001 3-18 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 46 Card Connections & Installation Ejector Arms (2) Ejector Arms (2) Unlock card 2 Unlock card Screw 1 Screw Lock card Screw 1 Lock card Screw Figure 3-16 Model 7012-C card installation in Model 7001 3-19 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 47: Introduction

    Operation Introduction Maximum signal levels To prevent overheating or damage to the relays, never The information in this section is arranged as follows: exceed the following maximum signal levels: Power limits: Summarizes the maximum power DC signals: 110V between any two pins (termi- limits of the Model 7012 matrix card assembly.

  • Page 48: Channel Assignments

    Operation as shown in Figure 4-2. Each channel is designated as a 4.3.1 Channel assignments row/column crosspoint. The Model 7001 has a channel status display (Figure 4- 1) that provides the real-time state of each available To control the matrix card from the mainframe, each channel.

  • Page 49: Display Organization For Multiplexer Channels

    Operation Column R1,C1 R1,C2 R1,C3 R1,C4 R1,C5 R1,C6 R1,C7 R1,C8 R1,C9 R1,C10 R2,C8 R2,C1 R2,C2 R2,C3 R2,C4 R2,C5 R2,C6 R2,C7 R2,C9 R1,C10 R3,C1 R3,C2 R3,C3 R3,C4 R3,C5 R3,C6 R3,C7 R3,C8 R3,C9 R3,C10 R4,C1 R4,C2 R4,C3 R4,C4 R4,C5 R4,C6 R4,C7 R4,C8 R4,C9 R4,C10 R = Row...

  • Page 50: Front Panel Control

    Operation A manual scan can be performed by using the RESET 4.3.2 Front panel control default conditions of the Model 7001. RESET is selected from the SAVESETUP menu of the main MENU. When Closing and opening channels RESET is performed, the mainframe is conÞgured for an inÞnite number of manual scans.

  • Page 51: Matrix Switching Examples

    Operation *RST OUTPUT 707; “:open all” 10 OUTPUT 707; “*RST” :TRIGger:SEQuence:COUNt:AUTO ON” 20 OUTPUT 707; “:trig:seq:coun:auto on” :SCAN <list> 25 OUTPUT 707; “:trig:del 0.25” :INIT 30 OUTPUT 707; “:scan (@ 1!1!1:1!4!10)” 40 OUTPUT 707; “:INIT” 50 END The Þrst command resets the mainframe to a default scan conÞguration.

  • Page 52: Figure

    Model 196. (The For general purpose testing, the Keithley Model 196 Model 7012 has been designed to keep relay EMF at a can be used to make four-terminal resistance measure- minimal level.) To compensate for thermal EMFs, close...

  • Page 53: Figure

    Operation Thick Film Cols Volts/Ohms HI Ohms Sense HI Rows Volts/Ohms LO Model 196 Ohms Sense LO X = Closed Crosspoints Ω Equivalent Circuit Figure 4-5 Four-terminal ohms measurements Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 54: Voltage Divider Checks

    This is a particularly useful test for resistor networks that have a voltage coefÞcient speciÞcation. The test for this additional error. system in Figure 4-4 uses a Keithley Model 230 to source voltage and the Model 196 to measure voltage. Even though four-terminal connections are made at the...
  • Page 55 Operation Thick Film Cols Model 196 Measure V Rows Output Sense Output Common Sense Common X = Closed Crosspoints Model 7012 Model 230 Source V Equivalent Circuit Figure 4-6 Voltage divider checks Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 56: Transistor Testing

    12 matrix cards allowing 36 or more tran- Source Measure Units (SMU). There are three SMUs sistors to be tested. available from Keithley; the Model 236 Source Measure Unit, Model 237 High Voltage Source Measure Unit and Model 238 High Current Source Measure Unit.
  • Page 57 SMU #1 is conÞgured to Extensive trigger capabilities facilitate synchronization source voltage and measure current. It is used to power of the Keithley Source Measure Unit operations. By the collector circuit (V ) and measure the collector...

  • Page 58: Figure 4-8 Dc Parameter Checks

    Operation SMU #1 SMU #2 = Measure I ± = Source V = Measure V ± ↑ = Source I Equivalent Circuit SMU #1 Output HI Source V Sense HI Measure I Sense LO Output LO Rows SMU #2 Output HI Source I Sense HI Measure V...

  • Page 59: Measurement Considerations

    Operation sideration; however, seriously degrade measurement accuracy when testing high-impedance devices. The voltage measured across such a device, for example, can be substantially attenuated by the volt- +80 µa age divider action of the device source resistance and path isolation resistance, as shown in Figure 4-11. Also, leakage currents can be generated through these resis- tances by voltage sources in the system.

  • Page 60: Magnetic Fields

    Operation Any differential isolation capacitance affects DC mea- 4.5.3 Radio frequency interference surement settling time as well as AC measurement ac- curacy. Thus, it is often important that such capacitance RFI (Radio Frequency Interference) is a general term be kept as low as possible. Although the distributed ca- used to describe electromagnetic interference over a pacitance of the matrix card is generally Þxed by de- wide range of frequencies across the spectrum.

  • Page 61: Keeping Connectors Clean

    Operation manner. When in doubt, consult the manual for all in- Signal Leads strumentation in the test setup. Instrument 1 Instrument 2 Instrument 3 4.5.5 Keeping connectors clean Ground Loop As is the case with any high-resistance device, the in- Current tegrity of connectors can be damaged if they are not Power Line Ground...
  • Page 62 Operation 4-16 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 63: Introduction

    Service Information WARNING Handling and cleaning precautions The information in this section is in- tended only for qualiÞed service per- Because of the high impedance circuits on the Model sonnel. Some of the procedures may 7012, care should be taken when handling or servicing expose you to hazardous voltages the card to prevent possible contamination, which that could result in personal injury or...

  • Page 64: Performance Verification

    Table 5-1 Verification equipment Description Model or part SpeciÞcations Applications 300 Ω ; 0.01% Keithley Model 196 Path resistance Electrometer w/voltage source Keithley Model 617 20pA; 1.6% Offset current, isolation 20nA, 200nA; 0.25% 100V source; 0.2% Sensitive DVM Keithley Model 182 3mV;...

  • Page 65: Matrix Card Connections

    Section 3. venting the card from passing veriÞ- cation tests. Model 7012-S  Instrumentation can simply be hard- wired directly to the screw terminals of the connector Before pre-wiring any connectors plugs, study the fol- card. Jumper wires should be kept as short as possible.

  • Page 66: Offset Current Tests

    Service Information 1. Turn the Model 7001 off if it is on. chassis (common mode) for each pathway. In general, these tests are performed by simply measuring the 2. As shown in Figure 5-1, connect all terminals of leakage current with an electrometer. In the following matrix columns 1-10 together to form one common procedure, the Model 617 is used to measure leakage terminal.
  • Page 67 Service Information Model 7025 Unterminated Triax Cable Columns INPUT MODEL 617 (Measure Current) Rows Note : Setup shown is configured to test Row 1 pathways for offset current. Model 7012 Chassis ground is accessible at rear panel of the 7001. Figure 5-2 Common-mode offset current testing Model 7025...

  • Page 68: Contact Potential Tests

    4. Connect all row LO together on the common bus. 15. After settling, verify that the reading on the Model 182 is <500mV (7012-S). This measurement repre- 5. Place a short between HI to LO on the rows. sents the contact potential of the pathway.

  • Page 69: Path Isolation Tests

    Service Information 6. On the Model 617, select the 20pA range and re- 5.3.7 Path isolation tests lease zero check. 7. On the Model 617, press suppress to cancel offset These tests check the leakage resistance (isolation) be- current and then enable zero check. tween adjacent paths.
  • Page 70 Service Information Model 7025 Unterminated Triax Cable Banana to Banana Cable Ground Link Removed Columns INPUT (Red) Source V and Model 617 Measure V/I Rows Unterminated Banana Cables Note : Setup shown is configured to test isolation between row 1 column 1, and row 2 column 2.

  • Page 71: Differential And Common-Mode Isolation Tests

    Service Information 5. On the Model 617, set the voltage source for +100V, 5.3.8 Differential and common-mode isola- and select the 200nA current range. Make sure the tion tests voltage source is still in standby. 6. Place the Model 617 in the V/I measurement func- These tests check the leakage resistance (isolation) be- tion by pressing SHIFT OHMS.
  • Page 72 Service Information Model 7025 Unterminated Triax Cable Banana to Banana Cable Ground Link Removed Columns INPUT (Red) Source V and Model 617 Measure V/I Rows Unterminated Banana Cable Model 7012 Figure 5-6 Differential isolation testing Model 7025 Unterminated Triax Cable Banana to Banana Cable Ground Link Removed...

  • Page 73: Special Handling Of Static-Sensitive Devices

    Service Information Special handling of static-sensitive Table 5-3 Differential and common-mode isolation testing devices Differential or Test common-mode CMOS and other high-impedance devices are subject test Channels closed to possible static discharge damage because of the high-impedance levels involved. The following pre- Row 1 None cautions pertain speciÞcally to static-sensitive devices.

  • Page 74: Principles Of Operation

    Service Information Principles of operation 5.5.1 Block diagram Figure 5-8 shows a simpliÞed block diagram of the The following paragraphs discuss the basic operating Model 7012. Key elements include the relay drivers principles for the Model 7012, and can be used as an and relays, as well as the ROM, which contains card ID aid in troubleshooting the matrix card.

  • Page 75: Id Data Circuits

    Service Information 4. Once all data is received, the mainframe sends a 5.5.2 ID data circuits stop command, which is a low-to-high transition of the IDDATA line with the IDCLK line held high Upon power-up, card identiÞcation information from (see Figure 5-9). each card is read by the mainframe.

  • Page 76: Relay Power Control

    Service Information ID CLK IDDATA (Data output from mainframe or ROM) IDDATA (Data output from mainframe or ROM) Start Acknowledge Figure 5-10 Transmit and acknowledge sequence A power-on safeguard circuit, made up of U114 (a D- 5.5.4 Relay power control type ßip-ßop) and associated components, ensures that relays do not randomly energize on power-up and A relay power control circuit, made up of U106, U107,...

  • Page 77: Troubleshooting

    CAUTION Description and model Application Observe the following precautions when troubleshooting or repairing Multimeter Keithley 196 Measure DC voltages the switch card: Oscilloscope TEK 2243 View logic waveforms To avoid contamination, which could degrade card performance, always handle the card only by the handle 5.6.2 Troubleshooting access...
  • Page 78 Service Information Table 5-5 Troubleshooting procedure Step Item/Component Required Condition Comments GND pad All voltages referenced to digital ground (GND pad). +6V pad +6VDC Relay voltage. +5V pad +5VDC Logic voltage. +14.6V pad +14.6VDC Relay bias voltage. +V pad +3.5VDC* Regulated relay voltage.

  • Page 79: Introduction

    Parts lists for the various circuit boards are included in tables integrated with schematic diagrams and compo- nent layout drawings for the boards. Parts are listed al- If the card is to be returned to Keithley Instruments for phabetically in order of circuit designation. repair, perform the following: 1.

  • Page 80: Component Layouts And Schematic Diagrams

    Table 3 Parts List, Mass Terminated Connector Card for 7012-C. Table 1 Parts List, Relay Card for 7012-S and 7012-C. 7012-170 Component Layout, Mass Terminated Con- 7011-100 Component Layout, Relay Card for 7012-S nector Card for 7012-C. and 7012-C.
  • Page 81 Replaceable Parts Table 1. Relay Board for Model 7012-S and 7012-C, Parts List Circuit Desig. Description Keithley Part No. EJECTOR ARM 7011-301 ROLL PIN (FOR EJECTOR ARMS) DP-6-1 SHIELD 7011-305 SOCKET (FOR U105) SO-72 2-56X1/4 PHILLIPS PAN HD (FOR SCANNER SHIELD)
  • Page 82 25917 CHG’D U105 FROM IC-737 TO TC17-100. 6/18/01 DELETED SO-72. TC17-100 BOARD ASS’Y. ORIENT ARROW TOWARDS PIN 1 OF DEVICE.
  • Page 83 25917...
  • Page 84 TC17-100 25917...
  • Page 85 Replaceable Parts Table 2. Screw Terminal Board for Model 7012-S, Parts List Circuit Desig. Description Keithley Part No. CABLE CLAMP 7011-304-2 CAPTIVE SCREW (FOR TOP CLAMP) FA-243-1 CONNECTOR SHIM (FOR P1002, 1003) 7011-309 SHIELD 7011-305 STRIP, POLYURETHANE (FOR BOTTOM CLAMP)
  • Page 88 Replaceable Parts Table 3. Mass Terminated Connector Card for 7012-C, Parts List Circuit Desig. Description Keithley Part No. BRACKET 7011-307 CONNECTOR SHIM 7011-309 SHIELD 7011-311 STANDOFF ST-203-1 C101 CAP,.1UF,20%,50V,CERAMIC C-365-.1 CR101-104 DIODE,SILICON,IN4148 (DO-35) RF-28 E101,102 BEAD, FERRITE CT-9 J1004 CONN, 96-PIN, 3 ROWS...
  • Page 91 Service Form Model No. Serial No. Date Name and Telephone No. Company List all control settings, describe problem and check boxes that apply to problem. Intermittent Analog output follows display Particular range or function bad; specify IEEE failure Obvious problem on power-up Batteries and fuses are OK Front panel operational All ranges or functions are bad...
  • Page 92 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 Printed in the U.S.A. Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

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