Keithley 7077 Instruction Manual
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Keithley 7077 Instruction Manual

Keithley 7077 Instruction Manual

8x12 isolated coaxial matrix card
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Instruction Manual
Model 7077
Isolated Coaxial Matrix Card
Contains Operating and Servicing Information
7077-901-01 Rev. B / 4-97

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Table of Contents

Troubleshooting

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Summary of Contents for Keithley 7077

  • Page 1 Instruction Manual Model 7077 Isolated Coaxial Matrix Card Contains Operating and Servicing Information 7077-901-01 Rev. B / 4-97...
  • Page 2 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 3 Model 7077 Isolated Coaxial Matrix Card Instruction Manual ©1995, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, April 1997 Document Number: 7077-901-01 Rev. B...
  • Page 4 Revision A (Document Number 7077-901-01)................December 1995 Revision B (Document Number 7077-901-01)..................April 1997 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 5 (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) measuring circuits are Installation Category II. All other instru- Responsible body is the individual or group responsible for the use ments’...
  • Page 6 fire hazard. leads, and input jacks, must be purchased from Keithley Instru- ments. Standard fuses, with applicable national safety approvals, Chassis connections must only be used as shield connections for may be used if the rating and type are the same.
  • Page 7 ENVIRONMENT: Operating: 0 ° –50 ° C, up to 35 ° C at 70% RH. Storage: –25 ° to 65 ° C. COLUMNS Backplane Model 7077 Jumpers 8x12 Isolated Coaxial Matrix (factory installed) Specifications are subject to change without notice.

  • Page 8: Table Of Contents

    Table of Contents General Information Introduction ................................1-1 Features ................................1-1 Warranty information............................1-1 Manual addenda ..............................1-1 Safety symbols and terms ............................ 1-1 Specifications ............................... 1-1 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 9 Applications Introduction................................3-1 Thick film resistor network testing........................3-1 3.2.1 Four-terminal ohms measurements......................3-1 3.2.2 Voltage divider checks ..........................3-3 Transistor testing ..............................3-3 3.3.1 Current gain checks ........................... 3-6 3.3.2 and V measurements ......................... 3-7 Service Information Introduction................................4-1 Handling and cleaning precautions........................
  • Page 10 List of Illustrations Operation Figure 2-1 Model 7077 simplified schematic and crosspoint assignments ..............2-2 Figure 2-2 Simplified component layout ........................2-3 Figure 2-3 Single-ended switching example (using 4801 coaxial cable) ..............2-4 Figure 2-4 Differential switching example ........................2-4 Figure 2-5 Sensing example ............................
  • Page 11 List of Tables General Information Table 1-1 BNC cable lengths ............................1-2 Operation Table 2-1 Model 7077 column number assignments ....................2-1 Table 2-2 Available Keithley cables and connectors ....................2-6 Table 2-3 Narrow matrix expansion..........................2-8 Table 2-4 Mainframe matrix expansion – Model 707....................2-10 Table 2-5 Mainframe matrix expansion –...

  • Page 12: General Information

    The Model 7077 is a general purpose, two-pole, 8 × 12 (eight rows by twelve columns) matrix card. Some of the key fea- symbol on an instrument indicates high voltage tures include: may be present on the terminal(s).

  • Page 13: Unpacking And Inspection

    The following optional accessories are available from Kei- thley for use with the Model 7077: The Model 7077 is packaged in a resealable, anti-static bag Low noise triax cable to protect it from damage due to static discharge and from contamination that could degrade its performance.

  • Page 14: Operation

    In Figure 2-1 (View A), there are backplane jumpers located in the same matrix. The columns of every Model 7077 matrix on the matrix card. With the jumpers installed, the matrix...

  • Page 15: Operation

    View A - Simplified schematic COLUMN Note : Crosspoint assignments of Model 7077 Matrix Card shown above apply when installed in: Model 708 Switching Matrix - Stand-alone or master of multi-unit configuration or Model 707 Switching Matrix - Slot one of stand-alone or master of multi-unit configuration.
  • Page 16 Operation Backplane Jumpers Figure 2-2 Simplified component layout...

  • Page 17: Typical Matrix Switching Schemes

    Figure 2-3. The closure of a single crosspoint will connect an instrument to a DUT. COLUMN Shield Source or Measure System Common 7077 Source or Measure 7077 Figure 2-4 Differential switching example Figure 2-3 Single-ended switching example (using 4801 coaxial cable) 2.3.3 Sensing...

  • Page 18: Connections

    To avoid electrical shock that could re- sult in injury or death, ALWAYS remove All rows and columns of the Model 7077 Matrix Card are connected to the BNC connectors mounted on the rear panel power from the entire system (Model of the matrix card when shipped.

  • Page 19: Matrix Expansion

    Model 707 or 708 Switching Matrix. As explained in 50 Ω cable (RG-58C) terminated gator cable paragraph 2.2, the Model 7077 has eight sets of backplane with a BNC plug on one end and jumpers that connect the rows of the matrix card to the two alligator clips on the other end.
  • Page 20 For example, in some test systems it may be necessary to connect LO of the W137 Model 7077 (which is a two-pole card) to LO of a three-pole ROW G W138 card. As shipped, the Model 7077 backplane row jumpers...

  • Page 21: Narrow Matrix Expansion

    Configure wide matrices by connecting the columns of one positioned to connect the rows into the backplane of a Model Model 7077 card to the columns of another Model 7077 card. An example of a wide matrix (16 × 12) is shown in Fig- 707 or 708 Switching Matrix.

  • Page 22: Partial Matrix Implementation

    (Slot 1) matrix utilizing four Model 7077s contains 384 crosspoints. A partially implemented matrix is obtained by removing one Model 7077 from the switching matrix (Figure 2-11). The Columns partial matrix is still 16 × 24, but contains only 288 cross-...

  • Page 23: Mainframe Matrix Expansion

    Model 708 in half provides two column cables that will connect directly Systems containing up to five Model 7077 Matrix Cards are to the DUT. Figure 2-12 shows the connections of an exam- possible by daisy-chaining five Model 708 Switching Matri- ple single card system.
  • Page 24 Operation DUTs Ins truments DUTs Ins trumentation ROWS Simplified Equivalent Circuit COLUMNS ROWS 7077 Matrix Card = BNC Cables Tes t Fixture Figure 2-12 Single card example 2-11...
  • Page 25 Operation Model 707 Ins trumentation ROWS COLUMNS = BNC Cables Tes t Fixture DUTs 24 25 36 37 Instruments Simplified Equivalent Circuit Figure 2-13 Multiple card system example 2-12...

  • Page 26: Multiple Switching Matrix System

    2.6.4 Matrix/multiplexer system Figure 2-14 shows a system using eight matrix cards, requir- Figure 2-16 shows an example of how the Model 7077 is ing two Model 707s daisy-chained together. In this configu- used with a multiplexer card (Keithley Model 7075) in the ration, instrumentation and DUTs are connected to matrix same test system.
  • Page 27 Operation Model 707 (Mas ter) ROWS COLUMNS COLUMNS COLUMNS Tes t COLUMNS Fixture COLUMNS COLUMNS COLUMNS Model 707 (Slave) = BNC ROWS Cables Ins trumentation COLUMNS Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 Ins truments Slot 1 Slot 2 Simplified Equivalent Circuit...
  • Page 28 Operation Model 708 (Master) DUT Test Fixture Master/Slave BNC Cable - COLUMNS IN/OUT Cables BNC Cable - ROWS Model 708 (Slave) Instrumentation Simplified Equivalent Circuit DUTs Instrumentation (14 Connections) (10 Connections) 10 11 12 10 11 12 Master Slave Figure 2-15 Multiple switching matrix example –...
  • Page 29 Operation Figure 2-16 Matrix/multiplexer system 2-16...

  • Page 30: Applications

    In Figure 3-2, crosspoints A1 and voltage. The Model 7077 used in this system is configured as an 8 × 12 matrix. B3 are closed to measure the combined resistance of R1 and...
  • Page 31 Applications Model 7077 (8X12 Matrix) TF-1 TF-2 TF-3 Ohms Sense Volts Ohms Volts/Ohms HI Ohms Sense HI Measure V or 2000 MULTIMETER 4-terminal Ω Volts/Ohms LO Ohms Sense LO Model 2000 Output Sense Output Common Sense Common Source V Model 230 Figure 3-1 Thick film resistor network testing...

  • Page 32: Voltage Divider Checks

    Figure 3-3. resistor networks that have a voltage coefficient specifica- tion. The test system in Figure 3-1 uses the Keithley Model The thick film is tested by applying a voltage across the re- 230 to source voltage and the Keithley Model 2000 to mea- sistor network and measuring the voltage across each resistor sure voltage.
  • Page 33 2 0 0 0 M U L T I M E T E R Model 2000 Measure V Output Sense Output Common Sense Common Model 7077 Model 230 Source V Model 2000 Model 230 Equivalent Circuit Figure 3-3 Voltage divider checks...
  • Page 34 2 0 0 0 M U L T I M E T E R V or I Volts LO Model 2000 Amps HI Amps LO Output Common Source Model 230 Model 7077 Matrix Card Source Model 224 Figure 3-4 Transistor checking...

  • Page 35: Current Gain Checks

    2 0 0 0 M U L T I M E T E R Volts LO V or I Model 2000 Amps HI Amps LO Output Common Source Model 230 Model 7077 Source Model 224 Figure 3-5 Transistor current gain checks...

  • Page 36: I E And Vbe Measurements

    Applications 3.3.2 I and V measurements Matrix versatility is demonstrated in Figure 3-7 and Figure 3-8. The transistor is still configured as a common-emitter +80 µA amplifier, but the Model 2000 is removed from the collector circuit and used to measure emitter current and base-to-emit- ter voltage.
  • Page 37 2 0 0 0 M U L T I M E T E R Volts LO V or I Model 2000 Amps HI Amps LO Output Common Source Model 7077 Model 230 Legend Source Active path during current measurement Inactive path during current measurement Model 224 Figure 3-7 Transistor I...
  • Page 38 M U L T I M E T E R Model 2000 Amps HI Amps LO Output Common Source Model 230 Model 7077 Legend Active path during current measurement Source Inactive path during current measurement Model 224 Figure 3-8 Transistor V...

  • Page 39: Service Information

    The edge connectors will become con- taminated, and tapes and solder connec- Because of the high impedance circuits on the Model 7077, tions on the pc board may break as the care should be taken when handling or servicing the card to card bends.
  • Page 40 Referring to Figure 4-1, perform the following procedure to tightening both spring loaded mounting screws. install the Model 7077 Matrix Card in the Model 707 or 708 Switching Matrices. Model 708 — With the relay side of the matrix card fac-...
  • Page 41 INTE RFAC IEEE- 488 ADDR ESS Relays Mounting Screws Model 7077 Matrix Card Note: Rear panel installation into Model 708, is shown. Front panel installation is similar. View B - Matrix card installation in a Model 708 Switching Matrix. Figure 4-1...

  • Page 42: Performance Verification

    Model 707/708 Switching Matrix. The switching matrix must not be daisy-chained to another switching matrix. NOTE These conditions do not apply if the Model 7077's backplane jumpers have been removed. Do not use the Model 7070 Universal Adapter Card as an extender card to verify CAUTION performance of the Model 7077.

  • Page 43: Path Resistance Tests

    A. Program the switching matrix to close crosspoint 2. Install the Model 7077 Matrix Card in the switching ma- A1. Verify that the resistance of this path is <1.5 Ω . trix. B. Open crosspoint A1, and close crosspoint A2. Verify that the resistance of this path is <1.5 Ω...

  • Page 44: Offset Current Tests

    Note : Setup shown is configured to test the high (H) terminal of row A through crosspoints A1 through A12. Model 7077 Figure 4-2 Path resistance testing 4.4.4 Offset current tests 4. On the Model 6517, select the 200pA range, and enable zero check and then zero correct.
  • Page 45 FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. Model 6517 (Measure Current) Note : Setup shown is configured to test ROW A pathways for offset current. Model 7077 Figure 4-3 Common mode offset current testing Model 237-ALG-2 Low Noise Triax Cable Model 4802-10...

  • Page 46: Path Isolation Tests

    13. Turn off the Model 707/708, and make sure all power is removed from the circuit. 2. Install the Model 7077 in the Model 708 or in slot 1 of the Model 707. 14. Disconnect the Model 6517 from ROWS A and B. In a similar manner, reconnect it to ROWS B and C (picoam- 3.
  • Page 47 FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. Model 6517 Note : Setup shown is configured to test isolation between ROW A, COLUMN 1 and ROW B, COLUMN 2. Model 7077 Figure 4-5 Path isolation testing (guarded) Table 4-2 Path isolation tests...

  • Page 48: Differential And Common Model Isolation Tests

    13. After allowing the reading on the Model 6517 to settle, 2. Install the Model 7077 in the Model 708 or in slot 1 of verify that it is also >1G Ω . This measurement checks the Model 707.
  • Page 49 CAUTION: CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. Model 6517 Model 7077 Figure 4-6 Differential isolation testing Model 237-ALG-2 Model 4802-10 Low Noise T riax Cable...

  • Page 50: Principles Of Operation

    The following paragraphs discuss the basic operating princi- a “high” data bit is clocked (i.e., inverting drivers). ples for the Model 7077 and can be used when troubleshoot- ing the matrix card. The schematic drawing of the matrix card is shown in drawing 7077-106, located at the end of Section 5.

  • Page 51: Power Up Safeguard

    However, since many devices shield, make sure it is oriented such that the standoffs (staked in the Model 7077 are static-sensitive, it is recommended onto the shield) are positioned between the pc-board and the that they are all treated as static-sensitive.

  • Page 52: Table

    Service Information Table 4-5 Troubleshooting summary* Step Items/component** Comment Required condition W152 +6V supply +6V dc W155 +5V supply +5V dc W150 CLR ADDR line*** High logic pulse at the beginning of each card identification byte transfer sequence (upon power up). W151 NEXT ADDR line Low logic pulse before each byte transfer.

  • Page 53: Replaceable Parts

    • Complete the service form at the back of this manual and include it with the card. The parts list for the Model 7077 is included in tables inte- • Carefully pack the card in the original packing carton. grated with the schematic diagram and component layout •...

  • Page 54: Model 7077 Electrical Parts List

    Replaceable Parts Table 5-1 Model 7077 electrical parts list Circuit designation Description Keithley part no. C100-116 CAP,.1UF,20%,50V,CERAMIC C-365-.1 C117,118 CAP,.01UF,20%,50V,CERAMIC C-237-.01 C119 CAP,.01UF,10%,1000V,CERAMIC C-64-.01 C120,121 CAP,270PF,20%,100V,CERAMIC/FERRITE C-386-270P C122 CAP, 47UF,10%,16V,ALUM ELEC C-321-47 C123,124 CAP, 10UF,-20+100%,25V,ALUM ELEC C-314-10 CR100 DIODE,SILICON, 5400 (267-01)

  • Page 55: Table

    Replaceable Parts Table 5-2 Model 7077 mechanical parts list Description Keithley part no. 4-40X1/4 PHILLIPS PAN HD SEMS SCREW (SHIELD TO PCB) 4-40X1/4PPHSEM 6-32X3/8LG. PHIL FLAT HD SCR (FOR MOUNTING HANDLE) 6-32X3/8PFH 6-32X5/16PHIL PAN HD SEMS SCR (PANEL TO PCB)
  • Page 60 Index Applications 3-1 Handling and cleaning precautions 4-1 Recommended equipment 4-4, 4-13 Replaceable parts 5-1 Backplane row jumpers 2-6 and V measurements 3-7 Basic matrix configurations 2-1 Safety symbols and terms 1-1 Inspection for damage 1-2 Sensing 2-4 Instruction manual 1-2 Service information 4-1 Shipping contents 1-2 Single card system 2-10...
  • Page 61 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 62 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 Printed in the U.S.A.

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