Tektronix 2706 Instruction Manual
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Tektronix 2706 Instruction Manual

Rf preselector
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Instruction Manual
2706
RF Preselector
070-8545-02
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com

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Summary of Contents for Tektronix 2706

  • Page 1 Instruction Manual 2706 RF Preselector 070-8545-02 Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service.
  • Page 2 Copyright © Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077...
  • Page 3 WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
  • Page 4 ..........B–5 2706 RF Preselector...

  • Page 5: Table Of Contents

    ....A–1 Table A–2: Certifications and compliances ..... A–3 2706 RF Preselector...
  • Page 6 About this Manual This manual contains the following sections: H Chapter 1, “Introduction,” lists the features of the Tektronix 2706 RF Preselector and what you need to use the Preselector. H Chapter 2, “Using the Preselector,” describes how to control the Preselector manually or using a GPIB controller.
  • Page 7 2. Read Chapter 1, “Introduction,” for an overview of the Preselector’s features. 3. Follow the instructions in Chapter 2, “Using the Preselector,” to learn how to use the Preselector. 4. Use Chapter 3, “Performance Verification,” and Appendix A, “Specifica- tions,” to check that the Preselector is working correctly. 2706 RF Preselector...
  • Page 8 H Command names, and panel and cable labels are in bold type. H Text that you type into a GPIB controller is in single space type. Contacting Tektronix Product For questions about using Tektronix measurement products, call Support toll free in North America: 1-800-833-9200 6:00 a.m.
  • Page 9 Preface 2706 RF Preselector...
  • Page 10 Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. 2706 RF Preselector...
  • Page 11 CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: CAUTION WARNING Double Protective Ground Not suitable for Insulated Refer to Manual High Voltage (Earth) Terminal connection to the public telecom- munications network viii 2706 RF Preselector...
  • Page 12 Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components. To avoid electric shock, do not touch exposed connections. 2706 RF Preselector...
  • Page 13 Service Safety Summary 2706 RF Preselector...
  • Page 14 User Information...

  • Page 15: Figure 1-1: The Preselector's Front Panel

    Introduction This chapter describes the features of the Tektronix 2706 RF Preselector and what you need to use it. Preselector Controls and Connectors This section presents a brief tour of the Preselector controls and connectors. Front Panel The Preselector front panel has the following controls: The Preselector’s Front Panel...

  • Page 16: Figure 1-2: The Preselector's Rear Panel

    H two RF connecting cables with type N connectors or adapters If you will operate the Preselector remotely, you will also need the following: H an IEEE STD 488 GPIB 24-pin cable with a D-type shell (Tektronix part number 012–0991–00) H an IEEE–488 GPIB controller, or an IBM PC/AT or compatible 80386 (or...
  • Page 17 This section tells you how to operate the Preselector remotely with a controller or computer that uses the IEEE Standard 488.2-1987 (GPIB) interface. The smallest GPIB network that you can use is a Preselector and a controller; you will also probably connect a spectrum analyzer to the network. 2–1 2706 RF Preselector...
  • Page 18 7. Turn on the spectrum analyzer. 8. Turn on the controller and start the GPIB communications software. 9. Connect the RF source to the RF INPUT connector on the Preselector’s front panel. 2–2 2706 RF Preselector...

  • Page 19: Table 2-1: Commands Supported By The Preselector

    *IDN? Identification Query *IST? Individual Status Query *OPC and *OPC? Operation Complete *PRE and *PRE? Parallel Poll Register Enable *RST Reset *SRE and *SRE? Service Request Enable *STB? Read Status Byte STS? Status Selected Band Query 2–3 2706 RF Preselector...
  • Page 20 Using the Preselector Table 2–1: Commands Supported by the Preselector (Cont.) Full Command Title Name *TST? Self-Test *WAI Wait To Continue 2–4 2706 RF Preselector...
  • Page 21 WARNING The following servicing instructions are for use only by qualified personnel. To avoid injury, do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so. Refer to all safety summaries before performing any service.
  • Page 22 Service Information...
  • Page 23 Performance Verification Procedure To verify that your Preselector is operating within specification, you need: H a spectrum analyzer with a tracking generator, such as the Tektronix 2712 (or equivalent) H two RF connecting cables with type N connectors or adapters Test the Preselector as follows: 1.
  • Page 24 14. Read the frequency response and insertion loss from the spectrum analyzer’s screen. If the values exceed those in Appendix A, Specifications, ship the Preselector to your nearest Tektronix service center (follow the Repackaging for Shipment Instructions in Appendix E).
  • Page 25 LEDs do not light, or the Preselector does not finish its test with the BYPASS LED lit, or the Preselector does not otherwise work correctly, ship it to your nearest Tektronix service center (follow the Repackaging for Shipment Instructions in Appendix E).

  • Page 26: Figure 3-1: The Fuse Location

    7. Seat all ribbon cables by pressing firmly on all the connectors. 8. Slide the top panel back onto the cabinet. 9. Replace the two screws on the rear panel. 10. Plug the Preselector back in. The Preselector is now ready for use. 3–4 2706 RF Preselector...
  • Page 27 Preselector. The Preselector alone cannot protect the spectrum analyzer from power surges. A LISN provides a known source impedance for the connected power line and provides access to the RF signals of the device under test. 4–1 2706 RF Preselector...
  • Page 28 H biconical: used to measure horizontal and vertical polarization of radiated EMI in the 30 MHz to 300 MHz range. Use a biconical antenna (Tektronix part number 119–4148–00 or equivalent). H log periodic: used to measure horizontal and vertical polarization of radiated EMI in the 200 MHz to 1000 MHz range.
  • Page 29 Appendices...

  • Page 30: Table A-1: Preselector Band Related Specifications

    Appendix A: Specifications This appendix describes the electrical, mechanical, and environmental specifica- tions of the Tektronix 2706 RF Preselector. Electrical Specifications A–1 Range: 9 kHz to 1800 MHz Insertion loss (max): 2.0 dB Filters Frequency Range: 9 kHz to 1800 MHz Bandpass/high-pass flatness: 1.5 dB max...
  • Page 31 Five cycles (120 hrs) per MIL–T–28800C, Class 5 Vibration: Meets MIL–T–28800C Method 514 Procedure (modified) Shock, operating and storage: Three guillotine-type shocks of 30 g, one-half sine, 11 ms duration each direction along each major axis; total of 18 shocks A–2 2706 RF Preselector...

  • Page 32: Table A-2: Certifications And Compliances

    These are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct sunshine, rain, or direct wind. Pollution Degree 4 Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical outdoor locations. A–3 2706 RF Preselector...
  • Page 33 Class 1 (as defined in IEC 1010-1, Annex H) – grounded product Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J) Pollution Degree Pollution Degree 2 (as defined in IEC 1010-1). Note: Rated for indoor use only. A–4 2706 RF Preselector...
  • Page 34 Service Request Capability PP1: Parallel Poll Capability (Remote Configuration) DC1: Device Clear Capability DT0: No Device Trigger Capability RL1: Remote/Local Capability No Controller Capability Open Collector Bus Drivers TE0: No Extended Talker Capabilities LE0: No Extended Listener Capabilities B–1 2706 RF Preselector...
  • Page 35 Preselector will then assert its assigned data line during a parallel poll if it needs service. If two devices share a data line, a serial poll of each device is necessary to determine which one requires service. Refer to your controller’s manual for more information about GPIB polling. B–2 2706 RF Preselector...
  • Page 36 Sample Program The following is a typical program you can use to automatically control your Preselector. This program instructs the Preselector and a Tektronix 271X-Series GPIB compatible spectrum analyzer to scan 40 MHz to 100 MHz, then 150 MHz to 200 MHz. It first selects a Preselector filter, then instructs the spectrum analyzer to scan that frequency range.
  • Page 37 = "tri fre" CALL GPIB.CONTROLLER(3) '--- Make measurement and finish GOSUB MAKE.MEASUREMENT MAKE.MEASUREMENT: INPUT "Press {Enter} to acquire data ";In$ wrt$ = "wfm wfid:b,encdg:bin;curve?" CALL GPIB.CONTROLLER(3) CALL GPIB.CONTROLLER(11) GOSUB INSERT.LOSS RETURN INSERT.LOSS: 'Adjust for insertion loss here RETURN B–4 2706 RF Preselector...
  • Page 38 The *CLS command clears the following: H the Event Queue H the Standard Event Status Register (SESR) H the Status Byte Register (except the MAV bit; see below) B–5 2706 RF Preselector...
  • Page 39 The query response is an ASCII string separated into four fields by commas, and containing this information: Manufacturer, Model, Serial number, Firmware version. Example: *IDN? – might return the string Made for Tektronix by Electro – Metrics, 2706, 43, 1.00. B–6 2706 RF Preselector...
  • Page 40 H Puts the Preselector into the Operation Complete Query Idle State. H Puts the Preselector in BYPASS mode. The *RST command does not alter the following: H The state of the IEEE 488.1 interface. H The Standard Event Status Enable setting. Syntax: *RST B–7 2706 RF Preselector...
  • Page 41 MAV (Message available) ESB (Event status bit) RQS (Request service) Not used Example: *SRB? – might return the value 65 (binary 01000001). Because bits 0 and 6 are set, the Preselector requests service for a hardware error. B–8 2706 RF Preselector...
  • Page 42 Preselector returns to the state it was in just prior to the self-test. Syntax: *TST? The test response is either 0 (no errors detected) or non–zero (a micro-processor error). Send the Preselector to the nearest Tektronix servicing center if the test response is not zero. Example: *TST? –...
  • Page 43 Appendix B: Using the GPIB Interface B–10 2706 RF Preselector...

  • Page 44: Appendix C: Options

    North American, 230 V/60 Hz at 12 A Swiss, 230 V/50 Hz at 6 A Option 01 This option provides mounting hardware to connect the 2706 RF Preselector to the 271X-Series Spectrum Analyzer to form a single unit. An interface cable is also included.
  • Page 45 Appendix C: Options C–2 2706 RF Preselector...

  • Page 46: Appendix D: Parts List

    070-8545-01 1 Coaxial cable, Semi-rigid 118–8801–00 Power cord, USA, 110 V 161-0104-00 Options The following Preselector options are available through your local Tektronix Field Office: Description Tektronix Part Number Power cord, European, 230 V (Option A1) 161-0104-06 Power cord, UK, 230 V (Option A2)
  • Page 47 Appendix D: Parts List D–2 2706 RF Preselector...

  • Page 48: Appendix E: Repackaging For Shipment

    Appendix E: Repackaging for Shipment Pack the Preselector for shipping to a Tektronix Service Center for service or repair as follows: 1. Attach a tag to the instrument that shows: H the owner’s name and address H the name of an individual at your location who can be contacted...
  • Page 49 Appendix E: Repackaging for Shipment E–2 2706 RF Preselector...

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