Keysight Technologies N5244/5B Manual de usuario

Service Guide

)

N5244/5B 2-Port and 4-Port

PNA-X Microwave Network

Analyzers - Service Guide

N5244/5B Series -

(900 Hz/10 MHz - 43.5 GHz)

(900 Hz/10 MHz - 50 GHz)

This is the Service Guide for the N5244/5BSeries Microwave Network Analyzers.

Notices

2010-2023

No part of this manual may be

reproduced in any form or by any

means (including electronic storage

and retrieval or translation into a

foreign language) without prior

agreement and written consent

from Keysight Technologies, Inc. as

governed by United States and

international copyright laws.

Trademark Acknowledgments

Manual Part Number

N5245-90026

Edition

Edition 1, February 2023

Printed in USA/Malaysia

Published by:

Keysight Technologies

1400 Fountaingrove Parkway

Santa Rosa, CA 95403

Warranty

THE MATERIAL CONTAINED IN THIS

DOCUMENT IS PROVIDED “AS IS,”

AND IS SUBJECT TO BEING

CHANGED, WITHOUT NOTICE, IN

FUTURE EDITIONS. FURTHER, TO

THE MAXIMUM EXTENT PERMITTED

BY APPLICABLE LAW, KEYSIGHT

DISCLAIMS ALL WARRANTIES,

EITHER EXPRESS OR IMPLIED WITH

REGARD TOTHIS MANUAL AND

ANY INFORMATION CONTAINED

HEREIN, INCLUDING BUT NOT

LIMITED TOTHE IMPLIED

WARRANTIES OF

MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE.

KEYSIGHT SHALL NOT BE LIABLE

FOR ERRORS OR FORINCIDENTAL

OR CONSEQUENTIAL DAMAGES IN

CONNECTION WITH THE

FURNISHING, USE, OR

PERFORMANCE OF THIS

DOCUMENT OR ANY INFORMATION

CONTAINED HEREIN. SHOULD

KEYSIGHT AND THE USERHAVE A

SEPARATE WRITTEN AGREEMENT

WITH WARRANTY TERMS

COVERING THE MATERIAL IN THIS

DOCUMENT THAT CONFLICT WITH

THESE TERMS, THE WARRANTY

TERMS IN THE SEPARATE

AGREEMENT WILL CONTROL.

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.

U.S. Government Rights

The Software is “commercial

computer software,” as defined

by Federal Acquisition Regulation

(“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.keysight.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 documentation that is

not customarily provided to the

public; or (2) Relinquish to, or

otherwise provide, the

government rights in excess of

these rights customarily provided

to the public to use, modify,

reproduce, release, perform,

display, or disclose commercial

computer software 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.

Safety Notices

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 proceed beyond a CAUTION

notice until the indicated conditions

are fully understood and met.

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.

Contents

Keysight N5244B/45B Service Guide 5

1. Safety and Regulatory Information

Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Chapter One at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Electrostatic Discharge Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Regulatory Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Instrument Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Lithium Battery Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

2. General Product Information

Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Chapter Two at-a-Glance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Physical Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Electrical Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Analyzer Options, Accessories, and Upgrades Available. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Pulse I/O Adapter-N1966A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Required Service Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Keysight Support, Services, and Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Service and Support Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Contacting Keysight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Shipping Your Analyzer to Keysight for Service or Repair. . . . . . . . . . . . . . . . . . . . . . . . 2-8

3. Tests and Adjustments

Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Conventions Used for Hardkeys, Softkeys, and Menu Items. . . . . . . . . . . . . . . . . . . . . . 3-1

Chapter Three at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Verify the Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Protect Against Electrostatic Discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Allow the Analyzer to Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Review the Principles of Connector Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

About System Verification and Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Instrument Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

System Verification Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

6 Keysight N5244B/45B Service Guide

Contents

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Certificate of Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

ANSI/NCSL Z540.3–2006 and ISO/IEC Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Non-Standards Compliant Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

The Operator’s Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

The Test Port Cable Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

System Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

What the System Verification Verifies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Measurement Uncertainty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Measurement Traceability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Performing System Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32

Source Power Accuracy Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32

Source Maximum Power Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

Source Power Linearity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34

Frequency Accuracy Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35

Trace Noise Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

Receiver Compression Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Noise Floor Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38

Calibration Coefficients Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39

Dynamic Accuracy Test – Version 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

Dynamic Accuracy Test – Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41

Receiver Noise Figure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43

Noise State Calibration Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44

Noise Jitter Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-44

Noise Receiver Linearity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45

Noise Receiver Compression Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46

Dynamic Accuracy at Low Frequency (Available With Low Frequency Extension (LFE)

Installed Option 205/220/420/425) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48

DC Continuity Test the LFE Board and Test Ports (Available With Low Frequency Extension

(LFE) Installed Option 205/220/405/420/425). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50

Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51

Touchscreen Adjustment and Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51

10 MHz Frequency Reference Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

Synthesizer Bandwidth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53

Source Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53

IF Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54

Receiver Characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54

Receiver Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55

EE Default Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57

Contents

Keysight N5244B/45B Service Guide 7

IF Response Adjustment (Available Only with Option S93093/4A/B and or

S93900/1/2/4/5/7A/B Installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57

Noise Figure Adjustment (Available with Option 029 with S93029A/B Installed) . . . . 3-58

LFE Receiver Adjustment (Available With Low Frequency Extension (LFE) Installed Option

205/220/420/425) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-61

4. Troubleshooting

Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Chapter Four at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Conventions Used for Hardkeys, Softkeys, and Menu Items. . . . . . . . . . . . . . . . . . . . . . 4-3

Operating the Analyzer With Covers Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Protect Against Electrostatic Discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Assembly Replacement Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Getting Started with Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Check the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Troubleshooting Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Power Up Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Power Supply Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Troubleshooting LCD Display Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Front Panel Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

Front Panel Keypad and RPG Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

A3 Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

Checking the A2 USB Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

A1 Front Panel Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Rear Panel Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

Checking the USB Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

Checking the CONTROLLER Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

LAN Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

Measurement System Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31

Before you begin—consider: Where do you see a problem? . . . . . . . . . . . . . . . . . . . . . 4-31

Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode) . . . . . . . . . . . . . 4-33

Where to Begin Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

Checking the Source Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37

Checking the Signal Separation Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

Checking the Receiver Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52

Instrument Simplified Block Diagrams – LFE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

2-Port N5290A System Block Diagram (201 and 205) . . . . . . . . . . . . . . . . . . . . . . . . . 4-56

2-Port N5290A System Block Diagram (202 and 205) . . . . . . . . . . . . . . . . . . . . . . . . . 4-57

4-Port N5290A System Block Diagram (401) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61

Instrument Block Diagrams – 2-Port (Sheet 1), Non-LFE and Non-DDS (Version 6

8 Keysight N5244B/45B Service Guide

Contents

Synthesizers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-62

Microwave PNA-X, N5244/5B – 2-Port, Non-LFE and Non-DDS (Version 6 Synthesizers) .

4-62

Instrument Block Diagrams – 2-Port (Sheet 2), Non-LFE and DDS (Version 7 Synthesizer

Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

Microwave PNA-X, N5244/5B – 2-Port, Non-LFE and DDS (Version 7 Synthesizer

Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-64

Instrument Block Diagrams – 4-Port (Sheet 3), Non-LFE and Non-DDS (Version 6

Synthesizers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-66

Microwave PNA-X, N5244/5B – 4-Port, Non-LFE and Non-DDS (Version 6 Synthesizers) .

4-66

Instrument Block Diagrams – 4-Port (Sheet 4), LFE and Non-DDS (Version 6 Synthesizers) . .

4-68

Microwave PNA-X, N5244/5B – 4-Port, LFE and Non-DDS (Version 6 Synthesizers) . 4-68

Instrument Block Diagrams – 4-Port (Sheet 5), Non-LFE and DDS (Version 7 Synthesizer

Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-70

Microwave PNA-X, N5244/5B – 4-Port, Non-LFE and DDS (Version 7 Synthesizer

Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-70

Instrument Block Diagrams – 4-Port (Sheet 6), LFE and DDS (Version 7 Synthesizer

Assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72

Microwave PNA-X, N5244/5B – 4-Port, LFE and DDS (Version 7 Synthesizer Assemblies).

4-72

5. Theory of Operations

Information in This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Chapter Five at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Network Analyzer System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Functional Groups of the Network Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Synthesized Source Group Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

A4, A15, and A17 13.5 GHz Synthesizer Boards (S/N Prefixes <6021 Only) . . . . . . . . . 5-23

A15 Version 7 Digital to Digital Synthesizer (DDS) Assembly (S/N Prefixes ≥6021 Only). . .

5-23

A5 and A10 26.5 GHz Source Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

A7, A8, A12, and A13 50 GHz Doubler Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

A25 Multiplier/Amplifier 26.5 Board (HMA26.5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

A14 Frequency Reference Board (S/N prefixes <6021 Only) . . . . . . . . . . . . . . . . . . . . . 5-26

A23 Test Set Motherboard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27

A70 4-Port and A75 2-Port Low Frequency Extension (LFE) Board. . . . . . . . . . . . . . . . 5-30

Signal Separation Group Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-44

Configurable Test Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-44

A29–A32 Reference Couplers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45

Contents

Keysight N5244B/45B Service Guide 9

A33–A36 Test Port Couplers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-45

A38–A41 60-dB Source Step Attenuators and A42–A45 Bias Tees (Optional) . . . . . . 5-49

A38–A41 60-dB Source Step Attenuators and A71–74 Bias Tee Combiners (Optional) . . .

5-49

A50–A53 Mechanical Switches and A54 Combiner (Optional) . . . . . . . . . . . . . . . . . . . 5-49

Receiver Group Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-51

A46–A49 35-dB Receiver Step Attenuators (Optional) . . . . . . . . . . . . . . . . . . . . . . . . 5-51

A37 Reference Mixer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-51

A27 and A28 Mixer Bricks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-51

A24 IF Multiplexer Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-52

A16 SPAM Board (Analog Description) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-53

Digital Processing and Digital Control Group Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-57

Front Panel Subgroup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-59

Data Acquisition and Processing Subgroup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-60

Power Supply Group Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-62

Noise Measurement Group Operation (Option S93029A) . . . . . . . . . . . . . . . . . . . . . . . . . . 5-62

A56 Test Port 1 Option 029 Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63

A64 Test Port 1 Option 029 Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63

A57 Test Port 2 Option 029 Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63

A59 Noise Receiver (Downconverter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63

A9 Noise Receiver Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-63

6. Replaceable Parts

Information in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Chapter Six at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Assembly Replacement Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Rebuilt-Exchange Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Replaceable Parts Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Front Panel Assembly, Front Side, All Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Front Panel Assembly, Back Side, All Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Top Assemblies and Cables, All Options, Serial Number Prefixes <6021 . . . . . . . . . . . 6-19

Top Assemblies and Cables, All Options, Serial Number Prefixes ≥6021 . . . . . . . . . . . 6-27

2-Port Configurations, Serial Number Prefixes <6021 . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

2-Port Configurations, Serial Number Prefix ≥6021 . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-81

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-128

4-Port Configuration, Serial Number Prefix <6021 . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-129

4-Port Configurations, Serial Number Prefix ≥6021 . . . . . . . . . . . . . . . . . . . . . . . . . . 6-208

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-288

Rear Panel Assembly, All Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-289

Fan Assemblies, All Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-291

10 Keysight N5244B/45B Service Guide

Contents

Top Hardware and Miscellaneous Parts, All Options . . . . . . . . . . . . . . . . . . . . . . . . . .6-293

Bottom Hardware and Miscellaneous Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-295

Internal Hardware and Miscellaneous Parts, All Options . . . . . . . . . . . . . . . . . . . . . . .6-299

External Hardware and Miscellaneous Parts, All Options . . . . . . . . . . . . . . . . . . . . . . 6-301

Miscellaneous Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-303

7. Repair and Replacement Procedures

Information in This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2

Chapter Seven at-a-Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Personal Safety Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Electrostatic Discharge (ESD) Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Removal and Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

Removing the Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

Removing and Replacing the Front Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Removing and Replacing the A1–A3 and Other Front Panel Subassemblies . . . . . . . . . . . 7-12

Removing and Replacing the A4–A17 Boards

(For analyzers with serial numbers prefixed MY/SG/US5150 and below) . . . . . . . . . . . . . . 7-20

Removing and Replacing the A4–A17 Boards

(For analyzers with serial numbers prefixed MY/SG/US5201 and above) . . . . . . . . . . . . . . 7-24

Removing and Replacing the A18 System Motherboard . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27

Removing and Replacing the A19 Midplane Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30

Removing and Replacing the A20 Power Supply Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 7-32

Removing and Replacing the A21 CPU Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-34

Removing and Replacing the A22 GPIB Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-36

Removing and Replacing the A23 Test Set Motherboard. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-38

Removing and Replacing the A24 IF Multiplexer Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41

Removing and Replacing the A25 HMA26.5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43

Verify the Model/Version of HMA26.5 Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45

Removing and Replacing the A26 Splitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-46

Removing and Replacing the A27 and A28 Mixer Bricks . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-48

Removing and Replacing the A29–A32 Reference Couplers and Reference Coupler Mounting

Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-51

Removing and Replacing the A33–A36 Test Port Couplers . . . . . . . . . . . . . . . . . . . . . . . . . 7-53

Removing and Replacing the A37 Reference Mixer Switch . . . . . . . . . . . . . . . . . . . . . . . . . 7-55

Removing and Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver

Attenuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-57

Removing and Replacing the A42–A45 Bias Tees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-59

Removing and Replacing the A50–A53 Bypass Switches and the A54 Combiner . . . . . . . 7-61

Removing and Replacing the A55 Solid State Drive (SSD) . . . . . . . . . . . . . . . . . . . . . . . . . 7-64

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