Keithley 7038 Instruction Manual
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Keithley 7038 Instruction Manual

Keithley 7038 Instruction Manual

75q 2ghz multiplexer card
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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Instruction Manual Model 7038 75 Ω 2GHz Multiplexer Card Contains Operating and Servicing Information 7038-901-01 Rev. A / 6-98...
  • 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 Model 7038 75 Ω 2GHz Multiplexer Card Instruction Manual ©1998, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. First Printing June 1998 Document Number: 7038-901-01 Rev. A...
  • Page 5 Revision of the manual. Each new Revision includes a revised copy of this print history page. Revision A (Document Number (7038-901-01) ..................June 1998 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 6 (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 7 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 8 7038 75Ω 2.0GHz Multiplexer Specifications CHARACTERISTIC IMPEDANCE: 75Ω nominal. Mini SMB Connector MULTIPLEXERS PER CARD: Three (with isolated ground). Configuration CHANNELS PER MULTIPLEXER: Four. CONTACT CONFIGURATION: 1-pole, 1 of 4 tree. Channels 1, 5 and 9 normally closed. (Signal Common) OUTA RELAY DRIVE CURRENT: 154mA per channel.

  • Page 9: 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 Handling precautions ..........................
  • Page 10 Servicing Introduction ................................. 4-1 Handling and cleaning precautions........................4-1 4.2.1 Handling precautions ..........................4-1 4.2.2 Soldering considerations..........................4-1 Performance verification ............................. 4-1 4.3.1 Environmental conditions.......................... 4-1 4.3.2 Recommended verification equipment ...................... 4-2 4.3.3 Insertion loss tests............................4-2 4.3.4 Isolation resistance tests ..........................4-2 4.3.5 Channel isolation tests ..........................
  • Page 11 List of Illustrations Connections and Installation Figure 2-1 Model 7038 simplified schematic ........................ 2-2 Figure 2-2 Model 7038 card configuration........................2-2 Figure 2-3 Typical connection scheme .......................... 2-3 Figure 2-4 Card installation in Model 7001........................2-4 Figure 2-5 Card installation in Model 7002........................2-4...
  • Page 12 List of Tables Servicing Table 4-1 Recommended verification equipment ......................4-2 Table 4-2 Insertion loss values ............................. 4-2 Table 4-3 Recommended troubleshooting equipment....................4-8 Table 4-4 Troubleshooting procedure .......................... 4-8 Replaceable Parts Table 5-1 Model 7038 parts list............................ 5-2...

  • Page 13: General Information

    This section contains general information about the Model Any improvements or changes concerning the card or manu- 7038 75 Ω 2GHz Multiplexer Card. The Model 7038 is al will be explained in an addendum included with the card. equipped with three four-channel multiplexers and is de- Safety symbols and terms signed for both Model 7001 and 7002 Switch Systems.

  • Page 14: Unpacking And Inspection

    Repacking for shipment handling discussed below. Should it become necessary to return the Model 7038 for re- 1.7.2 Handling precautions pair, carefully pack the unit in its original packing carton or the equivalent, and include the following information: •...

  • Page 15: Connections And Installation

    2.3.2 Card configuration This section includes information on making connections to Figure 2-2 shows the general configuration of the Model the Model 7038 and installing the card in the Model 7001/ 7038. Connectors include: 7002 Switch System. IN 1-12 (channels 1-12): Each input is equipped with a min- Handling precautions iature SMB coaxial connector.
  • Page 16 Connector Configuration (Signal Common) OUTA Multiplexer A OUTB Multiplexer B IN10 OUTC Multiplexer C IN11 IN12 Figure 2-1 Model 7038 simplified schematic Multiplexer C Multiplexer B Multiplexer A Output Output Output Multiplexer C Multiplexer B Multiplexer A Inputs Inputs Inputs Figure 2-2 Model 7038 card configuration...

  • Page 17: Input/Output Connecting Cables

    Figure 2-3 shows a typical connecting scheme for the Model jacks should be made using RG-179 75 Ω coaxial cable 7038. In this arrangement, sources are connected to the mul- equipped with miniature SMB connectors. tiplexer A inputs while the measuring instrument is connect- ed to the output.

  • Page 18: Card Installation And Removal

    Connections and Installation Card installation and removal This paragraph explains how to install and remove the Model 7038 card assembly from the Model 7001/7002 mainframe. WARNING Installation or removal of the Model 7038 should be performed only by qual- Ejector Arms (2) ified service personnel.

  • Page 19: Card Removal

    Connections and Installation 2.4.2 Card removal Follow the steps below to remove the multiplexer card from the mainframe: WARNING Turn off power to all instrumentation (including the Model 7001/7002), and disconnect all line cords. Make sure all power is removed and any stored energy in external circuitry is discharged.

  • Page 20: Operation

    CHANNEL assignment, then press the Model 7001/7002 specifications of the card. CLOSE key. For example, to close channel 11 of a Model 7038 installed in slot 2, key in the following channel list, and To prevent over-heating or damage to the relays, never ex- press CLOSE:...

  • Page 21: Scanning Channels

    SCAN CHANNELS 2!2, 2!3, 2!6, 2!10-2!12 For example, send the following commands to scan through Note that channels are scanned in the order they appear in the all 12 channels of a Model 7038 installed in slot 1: scan list. *RST To perform a manual scan, first select the RESET default...

  • Page 22: Switching Considerations

    For example, with an insertion loss of 1dB, and well as on the dielectric constant of the insulating material.) Since the Model 7038 is designed to work with 75 Ω cables, a 10W source signal applied to the card, about 2W will be you must use 75 Ω...

  • Page 23: Multiplexer Expansion

    Operation Multiplexer expansion 3.6.2 Matrix expansion The proper way to connect the three Model 7038 multiplex- 3.6.1 Double T configuration ers together is shown in Figure 3-2. Here, two of the three The simplest way to connect the three Model 7038 multi- outputs are connected together using short coaxial cables, plexers together for expansion is to use the double "T"...

  • Page 24: Mux Configuration

    For one thing, the characteristic impedence is always maintained at 75 Ω . Sec- The three banks of the Model 7038 can also be connected together in the 1 × 8 mux configuration shown in Figure 3-3.

  • Page 25: Servicing

    This section contains information necessary to service the where dust could settle on the circuit board. Model 7038 and includes information on handling and clean- • Use dry nitrogen gas to clean dust off the board if ing, performance verification, as well as principles of opera- necessary.

  • Page 26: Recommended Verification Equipment

    24V to the Model 7038 to avoid card damage. 4. Install the Model 7038 in the Model 7001 or 7002 main- frame. 5. Close channel 1 on the Model 7038 card. 4.3.5 Channel isolation tests 6.
  • Page 27 5. Close channel 1 on the Model 7038. of multiplexer A. For each test: 6. Program the Model 6517A voltage source for 20V, and •...
  • Page 28 Figure 4-3. 7. Turn on the Model 6517A voltage source, and allow the 2. With the power off, install the Model 7038 card in the reading to settle. mainframe. 8. Verify that the Model 6517A resistance reading is 3.
  • Page 29 1 and 5, as shown in Figure 4-4. shield of each channel. For each test: 2. With the power off, install the Model 7038 card in the • Connect the electrometer to the center conductor and mainframe.
  • Page 30 Servicing Mini SMB-to-BNC-to-Triax adapter Model 7038 Triax Cable OUTA Connect to center of connector Voltage Source High WARNING: WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. 1010V PEAK MADE...

  • Page 31: Special Handling Of Static-Sensitive Devices

    Figure 4-5 shows a simplified block diagram of the Model made of plastic or foam. 7038. Key sections include the relay data control and driver ICs, the relays, and the card configuration memory. These • Keep these parts in their original con- various elements are discussed in the following paragraphs.

  • Page 32: Switching Circuits

    Table 4-3 summarizes recommended equipment for trouble- cussed below). Note that a relay driver output goes low to shooting the Model 7038. energize the corresponding relay. Channels 1, 5, 9 are select- ed by deenergizing the relay coils. Q100-105 perform this Table 4-3 function.

  • Page 33: Replaceable Parts

    Replaceable Parts Introduction Factory service This section contains replacement parts information, sche- If the card is to be returned to Keithley Instruments for repair, matic diagrams, and component layout drawings for the perform the following: Model 7038. • Call the Repair Department at 1-800-552-1115 for a Parts list Return Material Authorization (RMA) number.
  • Page 34 Replaceable Parts Table 5-1 Model 7038 parts list Circuit designation Description Keithley part no. C100, C102 CAP, 10UF, 20%, 25V, TANTALUM C-440-10 C101, C103, C104, C105 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1 CR 100-CR111, CR150- DIODE, SWITCHING, MMBD914 RF-83 CR176...
  • Page 39 Index × 8 mux configuration 3-5 General information 1-1 Repacking for shipment 1-2 Recommended cables and connectors 1-2 Recommended verification equipment 4-2 Block diagram 4-7 Relay control 4-7 Replaceable parts 5-1 Handling and cleaning precautions 4-1 Handling precautions 1-2, 2-1, 4-1 Cable characteristics 3-3 Card characteristics 3-3 Safety symbols and terms 1-1...
  • Page 40 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 41 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 Printed in the U.S.A.

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