Keithley 7999-4 Instruction Manual
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Keithley 7999-4 Instruction Manual

Keithley 7999-4 Instruction Manual

Microwave switch
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Model 7999-4
Microwave Switch
Instruction Manual
Contains Operating and Servicing Information

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Summary of Contents for Keithley 7999-4

  • Page 1 Model 7999-4 Microwave Switch Instruction Manual Contains Operating and Servicing Information...
  • 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 batter- ies, diskettes, and documentation.
  • Page 3 Model 7999-4 SPDT Microwave RS-232 Switch Instruction Manual ©1999, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Second Printing, December 1999 Document Number: 7999-4-901-01 Rev. B...
  • Page 4 Revision A (Document Number 7999-4-901-01)............ September 1999 Revision B (Document Number 7999-4-901-01)............. December 1999 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.
  • Page 5 As described in the International Electrotechnical Commission (IEC) Standard IEC 664, digital multimeter measuring circuits (e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010) are Installation Category II. All other instruments’ signal terminals are Installation Category I and must not be connected to mains.
  • Page 6 To maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety approvals, may be used if the rating and type are 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.
  • Page 7 7999-4 Microwave SPDT RS-232 Switch CONTACT CONFIGURATION: Single Pole Double Throw. GENERAL CONNECTOR TYPE: 3-SMA type connectors (COMMON, NO, NC). INTERFACE: RS-232 control (9600 baud, 8 data, 1 stop). Response MAXIMUM SIGNAL: 120W 3GHz (VSWR 1.15 or less), CAT I.

  • Page 8: Table Of Contents

    Table of Contents General Information Introduction ................1-2 Feature overview ................ 1-2 Warranty information ..............1-2 Manual addenda ................. 1-2 Safety symbols and terms ............1-3 Specifications ................1-3 Unpacking and inspection ............1-3 Inspection for damage ............1-3 Handling precautions ............1-3 Shipment contents ...............
  • Page 9 Service Information Introduction ................4-2 Handling and cleaning precautions ..........4-2 Handling precautions ............4-2 Card and connector cleaning ..........4-2 Performance verification ............. 4-3 Environmental conditions ............ 4-3 Recommended equipment ........... 4-3 Channel resistance tests ............4-3 Replacing components ..............4-5 Replacement parts ...............
  • Page 10 List of Illustrations Connections Figure 2-1 General layout................2-3 Figure 2-2 Simplified schematic..............2-4 Figure 2-3 RS-232 interface connector ............. 2-5 Operation Figure 3-1 Toggle relay state switch............3-2 Figure 3-2 Jumper location................ 3-4 Service Information Figure 4-1 Channel resistance test connections......... 4-4...
  • Page 11 List of Tables Connections Table 2-1 RS-232 connector terminals .............2-5 Operation Table 3-1 Jumper positions—termination characters .......3-3 Table 3-2 Command set................3-5 Service Information Table 4-1 Recommended verification equipment........4-3 Replaceable Parts Table 5-1 Parts list—electronic components..........5-3 Table 5-2 Parts list—mechanical parts .............5-4...

  • Page 12: General Information

    General Information...

  • Page 13: Feature Overview

    Keithley representative or call one of our Applications Engineers at 1-800-348-3735 (U.S. and Canada only). Worldwide phone numbers are listed at the front of this manual. Feature overview The Model 7999-4 is a single channel Microwave SPDT switch with the following features: • SMA connectors •...

  • Page 14: Safety Symbols And Terms

    Unpacking and inspection Inspection for damage The Model 7999-4 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 performance. Before remov- ing the switch from the bag, observe the precautions on handling discussed below.

  • Page 15: Shipment Contents

    Keithley part number 7999-4-901-00. The manual package includes an instruction manual and any pertinent addenda. Repacking for shipment Should it become necessary to return the Model 7999-4 for repair, carefully pack the unit in its original packing carton or the equivalent, and include the following information: •...

  • Page 16: Connections

    Connections...

  • Page 17: Introduction

    Operate the card in a clean environment. If the card becomes contaminated, it should be thoroughly cleaned as explained in Section 4. Configuration Layout Figure 2-1 shows the general layout of the Model 7999-4 which features: Connectors: • Power receptacle: 3-pin phoenix jack for supplied power module •...

  • Page 18: Figure 2-1 General Layout

    Connections Figure 2-1 SMA Connectors General layout NO LED NC LED CA-27-20D Cable Assembly J1003 Power LED RS-232 Port Power Receptacle (3-pin phoenix) (DB-9 connector)

  • Page 19: Simplified Schematic

    Connections Simplified schematic Figure 2-2 shows a simplified schematic diagram of the Model 7999-4. The schematic is arranged into four sections: • Power • RS-232 interface • Relay control • Relay Figure 2-2 SMA Connectors Simplified NC LED NO LED...

  • Page 20: Connections

    RS-232 cable terminated with DB-9 connectors. Do not use a null modem cable. The serial port uses the transmit (TXD), receive (RXD), and signal ground (GND) line of the RS-232 standard. Figure 2-3 shows the Model 7999-4 connector with Table 2-1 contain- ing the pinouts for the connector.

  • Page 21: Sma Connectors

    Connections SMA connectors The Model 7999-4 has three SMA connectors which represents the Common, NO (normally open), and NC (normally closed) connections of the relay. Power connector Connect the supplied power adapter (Model PS-57A) to the power connector. WARNING To prevent damage to the Model 7999-4, use only the Keithley Model PS-57A AC/DC power adapter.
  • Page 22 Operation...

  • Page 23: Operation

    Operation Introduction This section contains operating information for the Model 7999-4. The information is orga- nized as follows: • Maximum signal considerations • Toggle relay state switch • Operation (RS-232) • Switching considerations Maximum signal considerations WARNING Maximum voltage between any conductor and ground is 42V.

  • Page 24: Sending And Receiving Data

    To configure the termination character, change the jumpers for PA6 (J1006) and PA7 (J1008) located on the Model 7999-4 printed circuit board. Refer to Table 3-1 and Figure 3-2 for jumper details. Refer to the first three steps of disassembly information in Section 4 to access the circuit board.

  • Page 25: Figure 3-2 Jumper Location

    Operation Figure 3-2 Jumper location...

  • Page 26: Rs-232 Commands

    I or i Firmware information can be retrieved over the information RS-232 using the ‘I’ command. After the command is sent, ‘Keithley Instruments Inc., Model 7999-4, rev A01’ (or similar due to firmware revision level) will be returned over the RS-232. NOTE...

  • Page 27: Switching Considerations

    Also, leakage currents can be generated through these resistances by voltage sources in the system. Refer to the specifications located at the front of this manual for Model 7999-4 isolation information.

  • Page 28: Insertion Loss

    Insertion loss indicates signal lost while passing through the switch. This loss occurs in the various signal path components through the switch connectors, PC board traces, and relay. Refer to the specifications located at the front of this manual for Model 7999-4 insertion loss information.

  • Page 29: Service Information

    Service Information...

  • Page 30: Introduction

    Handling and cleaning precautions Because of the high-impedance areas on the Model 7999-4, care should be taken when han- dling or servicing the switch to prevent possible contamination. The following precautions should be observed when servicing the switch.

  • Page 31: Performance Verification

    Service Information Performance verification The following paragraphs discuss performance verification procedures for the Model 7999-4 including a channel resistance verification procedure. CAUTION Contamination will degrade the performance of the switch. To avoid contamination, always grasp the switch by the cover; do not touch the connectors.

  • Page 32: Figure

    FILTER 3A 250V AMPS POWER RANGE SAVE SETUP CONFIG HALT GPIB RS232 TEST >> OPEN CLOSE STEP SCAN DIGITS RATE EXIT ENTER Relay (NC or NO) Model 2010 DMM Model 7999-4 Relay Under Test. See Section 2 for Detailed Connections.

  • Page 33: Service Information

    After cleaning, allow the card to dry in a 50˚C low-humidity environment for several hours before use. Disassembly Perform the following steps to disassemble the Model 7999-4 to gain access to parts on the circuit board: Remove the six screws that hold the case together and the two hex-nuts on the DB9 connector.

  • Page 34: Replaceable Parts

    Replaceable Parts...
  • Page 35 This section contains replacement parts information and component layout for the Model 7999-4. Parts list Parts lists for the Model 7999-4 are contained in Table 5-1 and Table 5-2. Ordering information To place an order, or to obtain information concerning replacement parts, contact your Keithley representative or the factory (see inside front cover for addresses).

  • Page 36: Table

    Replaceable Parts Component layout The following component layout drawing is provided on the following page: • Component layout drawing: 7999-4-100 Table 5-1 Parts list—electronic components Circuit designation Description Keithley part no. C105, C114 CAP, 33PF, 10%, 100V, CERAMIC C-451-33P C106 CAP, 0.1UF, 20%, 50V, CERAMIC...

  • Page 37: Table

    Replaceable Parts Table 5-2 Parts list—mechanical parts Description Keithley part no. Bracket (relay) 7999-4-304A Cover (bottom) 7999-4-302A Cover (top) 7999-4-301A Female screw-lock CS-725 Lock-nut 4-40KEPNUT Phillips Pan Head Screw 4-40X1/4PPH Phillips Pan Head Screw SEMS (black) 4-40X3/8PPHSEMBLK Phillips Pan Head Screw SEMS (relay attaching hardware)
  • Page 39 Index Manual addenda 1-2 Maximum signal considerations 3-2 Card cleaning 4-2 Carriage return 3-3 Opening or closing the relay 3-5 Carriage return and line feed 3-3 Operation Channel resistance tests 4-3 Introduction 3-2 Component layout 5-3 RS-232 3-3 Configuration 2-2 Ordering information 5-2 configure termination character 3-3 overview 1-2...
  • 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...
  • Page 41 Keithley Instruments, Inc. 28775 Aurora Road Cleveland, Ohio 44139 Printed in the U.S.A.

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