Keysight 775D Operating And Service Manual
Keysight 775D Operating And Service Manual

Keysight 775D Operating And Service Manual

Dual directional couplers

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Summary of Contents for Keysight 775D

  • 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 Keysight 775D Dual Directional Couplers Operating and Service Manual...
  • Page 5 Data and Computer Software clause at DFARS 252.227-7013 for DOD agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer Software Restricted Rights clause at FAR 52.227-19 for other agencies. K eysight Technologies 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, U.S.A. ii 775D Operating And Service Manual...
  • Page 6: Table Of Contents

    Swept-Frequency Test, page 14 • Fixed-Frequency Test, page 15 • Auxiliary Arm SWR Test, page 17 • Fixed-Frequency Auxiliary-Arm SWR Test, page 19 • Coupling Test, page 21 • Insertion Loss Test, page 23 775D Operating And Service Manual iii...
  • Page 7 LIMITATION OF WARRANTY. The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. iv 775D Operating And Service Manual...
  • Page 8 K eysight Technologies products and not to products manufacture by others that may be sold or distributed by Keysight Technologies. Nothing in this warranty will be construed to limit any rights or remedies provided elsewhere in the contract of sale with respect to matters other than year 2000 compliance.
  • Page 9 Subscriber Only) Thailand (088) 226-008 (outside Bangkok) (66) 1-661-3714 (662) 661-3999 (within Bangkok) Hong Kong 800-930-871 (852) 2506 9233 Taiwan 0800-047-866 (886) 2 25456723 People’s Republic of 800-810-0189 (preferred) 10800-650-0121 China 10800-650-0021 India 1-600-11-2929 000-800-650-1101 vi 775D Operating And Service Manual...
  • Page 10 This text indicates that the instrument is an Industrial Scientific and Medical Group 1 Class A product (CISPER 11, Clause 4). This symbol indicates that the power line switch is ON. This symbol indicates that the power line switch is OFF or in STANDBY position. 775D Operating And Service Manual vii...
  • Page 11 If this product is to be powered by autotransformer, make sure the common terminal is connected to the neutral (grounded) side of the ac power supply. viii 775D Operating And Service Manual...
  • Page 12: Overview

    Overview The K eysight 775D dual directional couplers are three-port passive devices for use in 7-mm, 50-ohm systems. A coupler is essentially a device for sampling power flowing in one direction in a transmission line. Since no coupler is perfect, some power flowing in the opposite (unwanted) direction is also sampled.
  • Page 13: Specifications

    230 mm x 79 mm x 45 mm Weight (net) 3 lb (1.4 kg) 1. Measured with Keysight H02-909A (male) or H03-909A (female) termination. 2. Compatible with connectors whose dimensions conform to MIL-C-39012 or MIL-C-71. 2 775D Operating and Service Manual...
  • Page 14: Unpacking And Setup

    Technologies office attach a tag indicating the type of service required, return address, model number, and serial number). 2. Use a strong shipping container. A double wall carton made of 350-pound test material is adequate. 775D Operating and Service Manual 3...
  • Page 15 The Type N connectors used on these couplers will mate with all other Type N connectors whose dimensions conform to MIL-C-71B and MIL-C-39012. Do not mate with the male Type N connector on 775D’s with serials below 3141 (see caution below). See Figure 1 for dimensions.
  • Page 16 Unpacking and Setup Figure 2 775D Coupler Terminology 775D Operating and Service Manual 5...
  • Page 17: Applications

    Applications Introduction The 775D couplers are usually used in a reflectometer. Figures 3, 4, 5, and 6 illustrate typical setups. Note that a line stretcher (or a longer length of cable) must be used with vector voltmeters or network analyzers to balance the two signal paths in the coupler for zero phase reference.
  • Page 18 Applications Figure 3 Typical Reflectometry Setup Figure 4 Setup for Impedance Measurement 775D Operating and Service Manual 7...
  • Page 19 Connect first as shown in Figure 6. Take a reading, then interchange the thermistor mount and the load and take another reading. Adjust the system for a maximum incident/reflected power ratio. 8 775D Operating and Service Manual...
  • Page 20 Applications Power Leveling The 775D can also be used for power leveling, if a single directional coupler is not available. Connect as shown in the left half of Figure 3. Terminate the unused auxiliary arm with a 50-ohm termination. 775D Operating and Service Manual 9...
  • Page 21: Performance Tests

    K eysight for repair. Test Equipment The equipment shown in Table 2 is recommended for testing. Other equipment may be used provided its specifications equal or exceed the specifications listed under Critical Specifications. 10 775D Operating and Service Manual...
  • Page 22 Response: 0.1 dB/octave Adapter Male-to-male Type N Adapter Female-to-female Type N Signal source Frequency: frequency of interest Internal AM: 1 kHz squarewave Slotted line Frequency: band of interest Residual SWR: <1.04 Impedance: 50 ohms 775D Operating and Service Manual 11...
  • Page 23: Directivity Test

    (coupler perfectly terminated each time and same power). The 775D should be swept-frequency tested to be sure that there are no narrow-band out-of-specification points that would be missed with fixed-frequency testing.
  • Page 24 38 dB. At K eysight , selected loads are used to ensure that the coupler is within specifications. See Note in performance test introduction. d. Turn the coupler end-for-end and repeat the test on the other half of the coupler. 775D Operating and Service Manual 13...
  • Page 25: Primary-Line Swr Test

    Primary-Line SWR Test ≤ Specification 1.15 NOTE To test a 775D use another good 775D as the directional coupler in Figure 8. Swept-Frequency Test Description Refer to Figure 8 for test setup and for test equipment. SWR is measured by measuring return loss with a leveled source. As with any reflectometer, first calibration is performed by reflecting all of the signal.
  • Page 26: Fixed-Frequency Test

    This fixed-frequency SWR test should be used when the coupler does not meet the sweep-frequency test or when the equipment for swept-frequency testing is not availalbe. the setup used is the standard method of measuring SWR with a slotted line and SWR meter. 775D Operating and Service Manual 15...
  • Page 27 8. Slide slotted-line carriage to a maximum SWR indication (minimum needle indication) and read meter. If reading is not 1.15 or less, try different low-SWR terminations and try testing other couplers before rejecting the coupler under test. 16 775D Operating and Service Manual...
  • Page 28: Auxiliary Arm Swr Test

    Performance Tests Auxiliary Arm SWR Test ≤ Specification NOTE To test a 775D use another good 775D as the directional coupler in Figure Swept Frequency Test Description Refer to Figure 10 for test setup and for test equipment. SWR is measured by measuring return loss with a leveled source. As with any reflectometer, first calibration is performed by reflecting all of the signal.
  • Page 29 Mark this trace with a grease pencil. This is the calibration trace. 3. Measure the auxiliary-arm SWR as follows: a. Connect the 775D under test as shown at (2) in Figure b. Increase the gain on the swept-frequency indicator by 21.9 dB.
  • Page 30: Fixed-Frequency Auxiliary-Arm Swr Test

    3. Set SWR meter to HIGH XTAL input impedance and obtain a reading. 4. Peak the reading on SWR meter either by adjusting modulation frequency of signal source or frequency control on SWR meter. 5. Set any convenient reference on SWR meter 40 dB NORMAL scale. 775D Operating and Service Manual 19...
  • Page 31 8. Slide slotted-line carriage to a maximum SWR indication (minimum needle indication) and read meter. If reading is not 1.15 or less, try different low-SWR terminations and try testing other couplers before rejecting the coupler under test. 20 775D Operating and Service Manual...
  • Page 32: Coupling Test

    Coupling Test Setup • Equipment Sweep oscillator • Low-pass filter • Directional coupler • Crystal detector (2) • Termination (2) • Low SWR termination • Attenuator • Barretter • SWR meter • X-Y recorder 775D Operating and Service Manual 21...
  • Page 33 1 dB scale. Specification limits are given at the beginning of the test. e. Turn coupler end-for-end and test other half of coupler. 22 775D Operating and Service Manual...
  • Page 34: Insertion Loss Test

    Performance Tests Insertion Loss Test ≤ Specification 0.4 dB NOTE To test a 775D use another good 775D as the directional coupler in Figure Description Refer to Figure 13 for test setup and Table 2 for test equipment. Insertion loss will be measured on a swept-frequency basis using an SWR meter and an X-Y recorder.
  • Page 35 SWR meter. Adjust reading on SWR meter to be 0.4 dB for 775D (this reading is maximum insertion-loss limit for coupler being tested). g. Manually sweep frequency and adjust X-Y recorder controls to keep pen holder on paper.
  • Page 36 Performance Tests Table 3 Performance Test Record Tested by: Auxiliary Arm: (≥19.9 dB return loss) Coupling: Mean Coupling: dB (20 ± 0.5 dB) Maximum coupling variation: dB (± 1 dB) Insertion Loss: (<0.4 dB) 775D Operating and Service Manual 25...
  • Page 37 This information is subject to change without notice. © Keysight Technologies 2000 - 2014 Edition 3, August 2014 *00774-90009* 00774-90009 www.keysight.com...

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