Keysight 773d Operating and Service Manual

Brand: Keysight

Model: 773d

Type: Operating and Service Manual

This manual is also suitable for

772D

Keysight 773d is a directional coupler that can measure forward and reflected power simultaneously in a single line. It provides accurate and reliable power measurements for a variety of applications, including antenna matching, filter tuning, and amplifier characterization. The 773d is easy to use, with a simple front panel that allows you to quickly select the desired measurement range and function. It also features a rugged construction that can withstand harsh environments.

Keysight 772D and 773D

Directional Couplers

Operating and

Service Manual

2 Keysight 772D and 773D Operating and Service Manual

Notices

No part of this manual may be reproduced in

any form or by any means (including electronic

storage and retrieval or translation into a for-

eign language) without prior agreement and

written consent from Keysight Technologies as

governed by United States and international

Manual Part Number

00772-90001

Edition

Edition 3, September 26, 2019

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies

Bayan Lepas Free Industrial Zone,

11900 Penang, Malaysia

Technology Licenses

The hardware and/or software described in

this document are furnished under a license

and may be used or copied only in accordance

with the terms of such license.

Declaration of Conformity

Declarations of Conformity for this product

and for other Keysight products may be down-

loaded from the Web. Go to http://www.key-

sight.com/go/conformity. You can then search

by product number to find the latest Declara-

tion of Conformity.

U.S. Government Rights

The Software is “commercial computer soft-

ware,” as defined by Federal Acquisition Regu-

lation (“FAR”) 2.101. Pursuant to FAR 12.212

and 27.405-3 and Department of Defense FAR

Supplement (“DFARS”) 227.7202, the U.S.

government acquires commercial computer

software under the same terms by which the

software is customarily provided to the public.

Accordingly, Keysight provides the Software to

U.S. government customers under its standard

commercial license, which is embodied in its

End User License Agreement (EULA), a copy of

which can be found at http://www.key-

sight.com/find/sweula. The license set forth in

the EULA represents the exclusive authority by

which the U.S. government may use, modify,

distribute, or disclose the Software. The EULA

and the license set forth therein, does not

require or permit, among other things, that

Keysight: (1) Furnish technical information

related to commercial computer software or

commercial computer software documenta-

tion that is not customarily provided to the

public; or (2) Relinquish to, or otherwise pro-

vide, the government rights in excess of these

rights customarily provided to the public to

use, modify, reproduce, release, perform, dis-

play, or disclose commercial computer soft-

ware or commercial computer software

documentation. No additional government

requirements beyond those set forth in the

EULA shall apply, except to the extent that

those terms, rights, or licenses are explicitly

required from all providers of commercial

computer software pursuant to the FAR and

the DFARS and are set forth specifically in

writing elsewhere in the EULA. Keysight shall

be under no obligation to update, revise or

otherwise modify the Software. With respect

to any technical data as defined by FAR 2.101,

pursuant to FAR 12.211 and 27.404.2 and

DFARS 227.7102, the U.S. government

acquires no greater than Limited Rights as

defined in FAR 27.401 or DFAR 227.7103-5 (c),

as applicable in any technical data.

Warranty

THE MATERIAL CONTAINED IN THIS DOCU-

MENT IS PROVIDED “AS IS,” AND IS SUBJECT

TO BEING CHANGED, WITHOUT NOTICE, IN

FUTURE EDITIONS. FURTHER, TO THE MAXI-

MUM EXTENT PERMITTED BY APPLICABLE

LAW, KEYSIGHT DISCLAIMS ALL WARRAN-

TIES, EITHER EXPRESS OR IMPLIED, WITH

REGARD TO THIS MANUAL AND ANY INFOR-

MATION CONTAINED HEREIN, INCLUDING

BUT NOT LIMITED TO THE IMPLIED WARRAN-

TIES OF MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE. KEYSIGHT

SHALL NOT BE LIABLE FOR ERRORS OR FOR

INCIDENTAL OR CONSEQUENTIAL DAMAGES

IN CONNECTION WITH THE FURNISHING,

USE, OR PERFORMANCE OF THIS DOCU-

MENT OR OF ANY INFORMATION CONTAINED

HEREIN. SHOULD KEYSIGHT AND THE USER

HAVE A SEPARATE WRITTEN AGREEMENT

WITH WARRANTY TERMS COVERING THE

MATERIAL IN THIS DOCUMENT THAT CON-

FLICT WITH THESE TERMS, THE WARRANTY

TERMS IN THE SEPARATE AGREEMENT

SHALL CONTROL.

Safety Information

CAUTION

A CAUTION notice denotes a hazard. It calls

attention to an operating procedure, practice,

or the like that, if not correctly performed or

adhered to, could result in damage to the

product or loss of important data. Do not pro-

ceed beyond a CAUTION notice until the indi-

cated conditions are fully understood and met.

WARNING

A WARNING notice denotes a hazard. It calls

attention to an operating procedure, practice,

or the like that, if not correctly performed or

adhered to, could result in personal injury or

death. Do not proceed beyond a WARNING

notice until the indicated conditions are fully

understood and met.

Keysight 772D and 773D Operating and Service Manual 3

Serial Numbers

This instrument has a two-part serial number. The first four digits and the letter comprise the serial

number prefix. The last five digits form a sequential suffix which is unique to each instrument. The

contents of this manual apply directly to instruments having the serial number prefix 2838 and

above.

Safety Symbols

The following symbols on the instrument and in the documentation indicate precautions which

must be taken to maintain safe operation of the instrument.

When you see this symbol on your instrument,

you should refer to the instrument’s

instruction manual for important information.

This symbol indicates hazardous voltages.

The laser radiation symbol is marked on products

that have a laser output.

This symbol indicates that the instrument

requires alternating current (ac) input.

This symbol indicates that the power line switch

is ON.

This symbol indicates that the power line switch

is OFF or in STANDBY position.

4 Keysight 772D and 773D Operating and Service Manual

Safety Considerations

Read the information below before using this instrument.

The following general safety precautions must be observed during all phases of operation, service,

and repair of this instrument. Failure to comply with these precautions or with specific warnings

elsewhere in this manual violates safety standards for design, manufacture, and intended use of

the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply

with these requirements.

Regulatory Markings

WARNING

SAFETY EARTH GROUND

This is a Safety Class I product (provided with a protective earthing terminal). An

uninterruptible safety earth ground must be provided from the main power source to the

product input wiring terminals, power cord, or supplied power cord set. Whenever it is likely

that the protection has been impaired, the product must be made inoperative and secured

against any unintended operation.

CAUTION

BEFORE APPLYING POWER

Verify that the product is configured to match the available main power source as described

in the input power configuration instructions in this manual. 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.

The CE mark is a registered trademark of the

European Community. This CE mark shows that

the product complies with all the relevant

European Legal Directives.

The CSA mark is a registered trademark of the

Canadian Standards Association.

This text indicates that the instrument is an

Industrial Scientific and Medical Group 1 Class A

product (CISPER 11, Clause 4).

THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight 772D and 773D Operating and Service Manual 5

Waste Electrical and Electronic Equipment (WEEE) Directive

This instrument complies with the WEEE Directive marking requirement. This affixed product label

indicates that you must not discard this electrical or electronic product in domestic household

waste.

Product category:

With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified

as a “Monitoring and Control Instrument” product.

The affixed product label is as shown below.

Do not dispose in domestic household waste.

To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://

about.keysight.com/en/companyinfo/environment/takeback.shtml for more information.

Sales and Technical Support

To contact Keysight for sales and technical support, refer to the support links on the following

Keysight websites:

–www.keysight.com/find/mta

(product-specific information and support, software and documentation updates)

–www.keysight.com/find/assist

(worldwide contact information for repair and service)

6 Keysight 772D and 773D Operating and Service Manual

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Keysight 772D and 773D Operating and Service Manual 7

Table of Contents

Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . . . . . . . . . . . . . . 5

Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

772D dual directional coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

773D directional coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Supplemental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Effective source match . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Voltage incident on 772D test Port and 773D input . . . . . . . . . . . . . . . . . . . . . . . . . 17

Directivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Calculating 772D error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Storage and shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Operating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Using the 772D dual directional coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Using the 773D directional coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Set up and calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Directivity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

8 Keysight 772D and 773D Operating and Service Manual

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Keysight 772D and 773D Operating and Service Manual 9

List of Figures

Figure 1 772D and 773D directional couplers . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 2 Voltage incident on 772D test port and 773D input . . . . . . . . . . . . . . 17

Figure 3 Directivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 4 772D error 0.1 to 2.0 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 5 772D error 2.0 to 12.4 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 6 772D error 12.4 to 18.0 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 7 772D dual direction coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 8 773D Directional Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 9 772D/773D performance test setup . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 10 Use and care of APC-7 connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

10 Keysight 772D and 773D Operating and Service Manual

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Keysight 772D and 773D Operating and Service Manual 11

List of Tables

Table 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 2 Supplemental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3 Effective source match . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 4 Recommended test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 5 Set up and calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 6 Correction for element reflection of the 905A . . . . . . . . . . . . . . . . . . . 25

12 Keysight 772D and 773D Operating and Service Manual

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Keysight 772D and 773D Operating and Service Manual 13

Description

Figure 1 772D and 773D directional couplers

772D dual directional coupler

The 772D dual directional coupler is a four port passive device. Directional couplers sample power

flowing in one direction and ignore power flowing in the opposite direction. Two couplers are

incorporated in the 772D so that power flowing in either direction can be sampled. Such a system

is usually called a reflectometer. In a reflectometer the incident power flowing into the setup and

the reflected power from the device under test are compared.

773D directional coupler

The 773D directional coupler is a three port passive device. Directional couplers in their auxiliary

arms sample the power flowing in one direction in the mainline and ignore power flowing in the

opposite direction. They can be used for measurement purposes or for power leveling. The

coupling in the 773D changes the same as the coupling variation of the input coupler in the 772D.

This property may be used to cancel out the coupling variation of the 772D in a reflectometer setup

by using the 773D to change the coupling for tracking purposes.

Warranty

The directional couplers are warranted and certified as indicated in the front matter of this manual.

14 Keysight 772D and 773D Operating and Service Manual

Specifications

The specifications given below are the performance standards or limits against which the

directional couplers are tested. Unless otherwise stated, the specifications apply to both

directional couplers.

Table 1 Specifications

Characteristics and conditions Limits Comments

Frequency range 2.0 to 18 GHz

Maximum directivity

2 to 12.4 GHz

12.4 to 18 GHz

30 dB

27 dB

For the 772D, this specification applies to the

test port only. Input port directivity is 24 dB @ 2

to 18 GHz.

Maximum primary line SWR

772D

2 to 12.4 GHz

12.4 to 18 GHz

773D

2 to 12.4 GHz

12.4 to 18 GHz

1.28

1.40

1.21

1.27

50 W nominal impedance

Maximum auxiliary line SWR

2 to 12.4 GHz

12.4 to 18 GHz

1.3

Established with a best fit line through the

coupling curve

Nominal coupling (2.0 to 18 GHz) 20 ± 1 dB

Maximum coupling variation

772D

2.0 to 18 GHz

773D

2.0 to 18 GHz

± 1 dB

Test port to incident

Tracking ≤ ± 0.7 dB With 772D TEST PORT shorted and not

including source-match ripple. Refers to the

relative tracking of the auxiliary arms: auxiliary

arms do not necessarily track in absolute power.

Typical relative tracking between 772D and

773D ≤ ±0.7 dB.

Primary line residual loss

772D

773D

< 1.5 dB

< 0.9 dB

Maximum power input 50 W (47 dBm) average

250 W (54 dBm) peak

Keysight 772D and 773D Operating and Service Manual 15

Connectors

772D

Input

Incident

Reflected

Test port

773D

Input

Coupled

Output

Option 001

773D only

Option 002

Input

Coupled

Output

Option 010

Input

Coupled

Output

MIL-C-39012

Type N (female)

APC-7

Type N (female)

APC-7

Type N (female)

Type N (male)

Type N (female)

Type N (male)

Offset by 2.5 degrees by design

On all ports on both 772D and 773D

Operating environment

Temperature range

Humidity

Maximum altitude

0 to +55° C

< 95% relative

4570 meters (15,000 feet)

Net weight

772D

773D

2.6 kg (5.72 lb)

0.8 kg (1.76 lb)

Dimensions

772D

Length

Width

Height

773D

Length

Width

Height

391 mm (15.4 in)

133 mm (5.3 in)

43 mm (1.7 in)

186 mm (7.3 in)

108 mm (4.3 in)

30 mm (1.2 in)

Table 1 Specifications (continued)

Characteristics and conditions Limits Comments

16 Keysight 772D and 773D Operating and Service Manual

Supplemental characteristics

Supplemental characteristics are not specifications; that is, they are not covered by the

certification and warranty at the beginning of this manual. They are typical or nominal

characteristics included as additional information for the user.

Effective source match

Table 2 Supplemental characteristics

Characteristics Frequency 772D 773D

Minimum directivity 0.1 to 2.0 GHz

12.4 to 20 GHz

39 dB

20 dB

39 dB

21 dB

Maximum primary line SWR 0.1 to 2.0 GHz

18 to 20 GHz

1.05

1.29

1.16

Maximum primary line SWR 0.1 to 2.0 GHz

18 to 20 GHz

1.08

1.17

1.07

1.17

Primary line residual loss 0.1 to 2.0 GHz

18 to 20 GHz

< 0.26 dB

< 1.3 dB

< 0.15 dB

< 0.6 dB

Table 3 Effective source match

Frequency 772D 773D

0.1 to 2 GHz 1.06 1.05

2 to 12.4 GHz 1.13 1.12

2.4 GHz to 18 GHz 1.18 1.15

18 to 20 GHz 1.32 1.28

Keysight 772D and 773D Operating and Service Manual 17

Voltage incident on 772D test Port and 773D input

Figure 2 depicts the typical coupling curve of the 772D and 773D.

Figure 2 Voltage incident on 772D test port and 773D input

Directivity

The following graph depicts the 772D/773D typical changes in directivity over the frequency range.

Figure 3 Directivity

COUPLING IN dB

FREQUENCY IN GHz

SPECIFICATIONS

DIRECTIVITY IN dB

FREQUENCY IN GHz

18 Keysight 772D and 773D Operating and Service Manual

Calculating 772D error

Analysis has shown the typical measurement error of the 772D to be:

Es = A + BGx + CGx2

where:

Es = error of swept-frequency measurement

A = directivity of 772D

B = effective source match + coupler directivity

C = source match

Gx = reflection coefficient of unknown

By using various techniques, such as fixed-frequency measurements, calibrating out the source

match error by taking an average of the open and short-circuit readings, or by running a calibration

grid this error can be reduced to:

Ef = A + CGx2

These two equations are graphed as follows:

Figure 4 772D error 0.1 to 2.0 GHz

Reflection (Gx)

Es(Gx) , Ef(Gx)

Keysight 772D and 773D Operating and Service Manual 19

Figure 5 772D error 2.0 to 12.4 GHz

Figure 6 772D error 12.4 to 18.0 GHz

Es(Gx) , Ef(Gx)

Reflection (Gx)

Es(Gx) , Ef(Gx)

Reflection (Gx)

20 Keysight 772D and 773D Operating and Service Manual

Installation

Initial inspection

1Inspect the shipping container for damage. If the shipping container or cushioning material is

damaged, it should be kept until the contents of the shipment have been checked for

completeness and the instrument has been checked mechanically and electrically. Procedures

for checking electrical performance are given under Performance Tests.

2If the contents are incomplete, if there is mechanical damage or defect, or if the instrument

does not pass the electrical performance test, contact the nearest Keysight Sales and Service

office. Refer to the Service and Support information in the front matter of this manual. Keysight

will arrange for repair or replacement of the damaged or defective equipment. Keep the

shipping materials for the carrier’s inspection.

3If you are returning the instrument for service, repackaging the instrument requires original

shipping containers and materials or their equivalents. Keysight can provide packaging

materials identical to the original materials. Refer to Service and Support information in the

front matter of this manual for the Keysight office nearest you. Attach a tag indicating the type

of service required, return address, model number and serial number. Mark the container

FRAGILE to insure careful handling. In any correspondence, refer to the instrument by model

number and serial number.

Storage and shipment

The instrument should be stored in a clean, dry environment. The following environmental

limitations apply to both storage and shipment:

aTemperature

bAltitude

cHumidity

–5 to +75 °C

|7620 meters (25,000 feet)

|95% relative

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