Keysight N5247BU-425 User manual

INSTALLATION GUIDE
)
Keysight
Add Low
Frequency
Extension (LFE)
For Version 6 &
Version 7
Synthesizers
To Upgrade PNA-X N5247B
Option 423 to Option 425 or
Option 423 with 029 to
Option 425 with 029
Upgrade Kit Order Number:
N5247BU-425 and
N5247BU-429
Keysight Kit Number:
N5247-60113
This is Installation Note is for upgrading the N5247B Microwave Network Analyzers from Option 423 or Option 423 with
Option029 to Option 425 or Option 425 with Option 029.

Notices
© Keysight Technologies, Inc.
2009-2022
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
N5247-90113
Edition
Edition 1, November 2022
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,
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REGARD TO THIS MANUAL AND
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HEREIN, INCLUDING BUT NOT
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FOR ERRORS OR FOR INCIDENTAL
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CONTAINED HEREIN. SHOULD
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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
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Accordingly, Keysight provides
the Software to U.S. government
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embodied in its End User License
Agreement (EULA), a copy of
which can be found at
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The license set forth in the EULA
represents the exclusive authority
by which the U.S. government
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and the license set forth therein,
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among other things, that
Keysight: (1) Furnish technical
information related to
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or commercial computer
software documentation that is
not customarily provided to the
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documentation. No additional
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extent that those terms, rights, or
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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.

3

4

5
Keysight Low Frequency Extension (LFE) Upgrade Kit
Upgrade Kit Number: N5247-60113
Installation Note
Description of the Upgrade
This upgrade adds the Option 425 low frequency extension (LFE) to an N5247B
Option 423 or to N5247B Option 423 with 029. When you complete this
upgrade your PNA-X will be a N5247B Option 425 or a N5247B Option 425
with 029:
— PC assembly, low frequency extension (LFE)
— bias combiners to all ports
— additional new cables
Refer to “Overview of the Installation Procedure” on page 14.
Getting Assistance from Keysight
Installing this upgrade kit requires special skills and experience. If you think
you may not be qualified to do the work, or need advice, contact Keysight.
Contacting Keysight
Assistance with test and measurements needs and information on finding a
local Keysight office are available on the Web at:
http://www.keysight.com/find/assist
If you do not have access to the Internet, please contact your Keysight field
engineer.
If You Have Problems With the Upgrade Kit Contents
Keysight stands behind the quality of the upgrade kit contents. If you have
problems with any item in the kit, refer to www.keysight.com and the Contact
Keysight ()link.
This repair must be done at a service center or a self-maintainer service
center! Refer to “Getting Assistance from Keysight” on page 5.
In any correspondence or telephone conversation, refer to the Keysight
product by its model number and full serial number. With this information,
the Keysight representative can determine whether your product is still
within its warranty period.

6 Installation Note N5247-90113
Getting Prepared
-
Getting Prepared
To successfully install this upgrade kit, you will need the following:
—Alicensekey-referto“License Key Redemption” below.
— A PDF copy or a paper copy of the PNA Service Guide - refer to
“Downloading the Online PNA Service Guide” below.
— An ESD-safe work area - refer to “Protecting Your Workspace from
Electrostatic Discharge” below.
— Correct tools - refer to “Tools Required for the Installation” on page 9.
— Enough time - refer to “About Installing the Upgrade” on page 10.
— Test equipment for the post-upgrade adjustments and full instrument
calibration. To view the equipment list, click the Chapter 3 bookmark “Tests
and Adjustments” in the PDF Service Guide1.
The PNA contains extremely sensitive components that can be ruined if
mishandled. Follow instructions carefully when making cable connections,
especially wire harness connections.
The person performing the work accepts responsibility for the full cost of
the repair or replacement of damaged components.
IMPORTANT!
Before you begin this upgrade:
—Verify your instrument’s firmware is A.13.55 or greater.
—Verify your instrument’s IF Multiplexer (IF MUX) board, has P4, P204,
P404, P604, P804 connectors. If not, Keysight will purchase a new IF
MUX board. Refer to your instrument’s Service Guide, Chapter 7
bookmark “Removing and Replacing the A20 IF Multiplexer Board” in
the PDF Service Guide and to “Contacting Keysight” on page 5a.
—Verify your Synthesizer board is version H or greater. If not, refer to
Appendix A:, “Synthesizer Board Upgrade (N5240-60074 (with
Tabs)/N5240-60076 (Without Tabs) Version F/G to Version H),”.
a. See “Downloading the Online PNA Service Guide” on page 8.
1. See “Downloading the Online PNA Service Guide” on page 8.

Installation Note N5247-90113 7
Getting Prepared
License Key Redemption
To enable the option product, you must request license key files(s) from the
Keysight Software Manager:
http://www.keysight.com/find/softwaremanager.
To complete the request, you will need to gather the following information:
— From the certificate
— Order number
— Certificate number
— From your instrument
— Model number
— Serial number
Using the information just gathered, you must request license key file(s) from
the Keysight Software Manager:
http://www.keysight.com/find/softwaremanager.
You will need to provide an email address, Keysight will promptly email your
license key file(s) as a message attachment.
Verify the License Contents
Refer to the license message you received from Keysight:
If the model number, serial number, or option number do not match those on
the license message you received from Keysight, you will not be able to install
the license key file. If this is the case you received from Keysight, you will not
be able to install the license key file. If this is the case, contact Keysight for
assistance. Refer to “Getting Assistance from Keysight” on page 5.
Ensure that you are connected to an external server, before attempting to
download your email and license key file.
If you are unfamiliar with the licensing process, refer to
https://www.keysight.com/us/en/assets/9018-04534/installation-guides
/9018-04534.pdf (N5242-90024).
The enclosed Software Entitlement Certificate is a receipt, verifying that
you have purchased a licensed option for the PNA of your choice. You must
now use a Keysight Web page to request a license key for the instrument
that will receive the option.

8 Installation Note N5247-90113
Getting Prepared
-
Downloading the Online PNA Service Guide
To view the online Service Guide for your PNA model number, use the following
steps:
1. Go to www.keysight.com.
2. In the Search box, enter the model number of the analyzer (e.g., N5225B)
and click Search.
3. Click Support > Keysight Product Support.
4. In the Search Support area type your instrument’s model number (e.g.,
N2225B).
5. Press Enter.
6. Scroll down to the PRINT DOCUMENTATION section and click to select
Service Manual.
The Service Manual for your instrument will be displayed near the top of
the right column.
7. Click the hyperlink of the Service Guide title to download the PDF file.
8. When the PDF of the Service Guide is displayed, scroll through the
Contents section bookmarks to locate the information needed.

Installation Note N5247-90113 9
Getting Prepared
Protecting Your Workspace from Electrostatic Discharge
For information, click on the Chapter 1 bookmark, “Electrostatic Discharge
Protection” in the PDF Service Guide1.
ESD Equipment Required for the Installation
Tools Required for the Installation
1. See “Downloading the Online PNA Service Guide” on page 8.
Description Keysight Part Number
ESD grounding wrist strap 9300-1367
5-ft grounding cord for wrist strap 9300-0980
2 x 4 ft conductive table mat and 15-ft grounding wire 9300-0797
ESD heel strap (for use with conductive floors) 9300-1308
Description Qty Part Number
T-6 TORX driver - set to 6 in-lbs (0.68 N.m) 1 N/A
T-10 TORX driver - set to 9 in-lbs (1.02 N.m) 1 N/A
T-20 TORX driver - set to 21 in-lbs (2.38 N.m) 1 N/A
5/16-in (8 mm) nutsetter or open end torque wrench- set to 10 in-lbs (1.13 N.m) 1 N/A
5/16-in (8 mm) nutsetter or open end torque wrench- set to 8 in-lbs (0.9 N.m) 1 N/A
5/16-in (8 mm) nutsetter or open end torque wrench - set to 21 in-lbs (2.38 N.m) 1 N/A
5/16-in (8 mm) nutsetter or open end wrench (to stabilize the bias tee combiner
when torquing cables)
1N/A
3/16-in (5 mm) nutsetter or open end torque wrench - set to 6 in-lbs (0.68 N.m) 1 N/A
5/8-in (16 mm) nutsetter or open end torque wrench - set to 21 in-lbs (2.38 N.m) 1 N/A
9 mm nutsetter or open end torque wrench - set to 21 in-lbs (2.38 N.m) 1 N/A
1/4-in (6 mm) open end wrench 1 N/A
Use a 5/16-in torque wrench set to 10 in-lbs on all cable connections,
except the front panel coupler to Bias-T combiner cable connections.
Torque these to 8 in-lbs.
Additional exception: Torque the front and rear panel bulkhead connectors
and these connections to 21 in-lb.

10 Installation Note N5247-90113
Getting Prepared
-
About Installing the Upgrade
Products affected N5247B Option 423 and N5247B Option 423 with 029
Installation to be performed by Keysight service center or personnel qualified by Keysight
Estimated installation time 5 hours
Estimated adjustment time 2.5 hours
Estimated full instrument calibration time 8.0 hours

Installation Note N5247-90113 11
Items Included in the Upgrade Kit
Items Included in the Upgrade Kit
Check the contents of your kit against the following list. If any part is missing or
damaged, contact Keysight Technologies. Refer to “Getting Assistance from
Keysight” on page 5.
This upgrade kit contains cables for Version 6 synthesizers and Version 7
direct digital synthesizer (DDS) assemblies. Please refer to your
instrument’s Service Guide, if you are unclear which assembly you have
installed. Refer to “Downloading the Online PNA Service Guide” on page 8.
Table 1 Contents of Upgrade Kit N5247-60113
Ref
Desig. Description Qty Part Number
-- Installation note (this document) 1 N5247-90113
-- Software Entitlement Certificate 1 5964-5145
-- China ROHs 1 9320-6722
A71 Port 1 LFE Bias-T combiner - port 1
4 5087-7403
A72 Port 3 LFE Bias-T combiner - port 3
A73 Port 4 LFE Bias-T combiner - port 4
A74 Port 2 LFE Bias-T combiner - port 2
A70 PC assy, low frequency extension (LFE) 1 N5291-60001
-- Bracket for IF MUX, low frequency extension (LFE) 1 N5240-00011
-- Bracket for Bias-T combiner 2 N5247-20149
-- Machine screw, M3 x 14, pan head (2 to attach A70 LFE board to the deck) 2 0515-0665
-- Machine screw, M3 x 25, pan head (3 to reattach TSMB assembly to deck) 3 0515-0667
-- Machine screw, M3.0 x 8, flat head 4 to attach bias T-combiner assemblies to deck
and 4 to attach lower bracket N5240-00011 to IF MUX board) 8 0515-0372
-- Machine screw, M3.0 x 6, flat head (8 to attach Bias T-combiners to bracket) 8 0515-1227
-- Machine screw, M2.5 x 14, pan head (4 to attach clamps to bias t combiners) 4 0515-2141
-- Cap, protective 4 1401-0214
-- clamps, cable 4 5023-3299
-- clamps, cable (LFE DC bias cables) 6 1400-1334
-- Nameplate, Option 425 and 425 with 029 1 N5247-80026
-- Dress panel, overlay – Option 425 1 N5247-80027
-- Dress panel, overlay – Option 425 with 029 1 N5247-80028

12 Installation Note N5247-90113
Items Included in the Upgrade Kit
-
-- Cable, ribbon assy, motherboard (MB/IF MUX/LFE/TSMB)) 1 N5240-60089
-- Cable, DC, 2 pin to R/A SMP 4 N5240-60091
W181 Cable, assy-RF, Port 1 CPLR THRU to port 1A71 port 1 bias combiner (without
Option 029 Only)
1 N5247-20167
W182 Cable, assy–RF A33 test port coupler to A71 port 1 bias combiner 1N5247-20162
W183 Cable, assy-RF, Port 3 CPLR THRU to A72 bias combiner, port 3 1 N5247-20170
W184 Cable, assy-RF, A34 port 3 test port coupler to A72 port 3 bias combiner 1 N5247-20164
W185 Cable, assy-RF, Port 4 /FP CPLR THRU to A73 port 4 bias combiner 1 N5247-20165
W186 Cable, assy-RF, A35 port 4 test port coupler to A73 port 4 bias combiner 1 N5247-20171
W187 Cable, assy-RF, A36 port 2 FP CPLR THRU to A74 port 2 bias combiner (425 without
Option 029 Only)
1 N5247-20163
W188 Cable, assy-RF, A36 port 2 test port coupler to A74 port 2 bias combiner 1 N5247-20169
W189 Cable, assy-RF, A71 port 1 bias combiner to A56 port 1 noise switch (425 with
Option 029 Only)
1 N5247-20172
W190 Cable, assy-RF, - A74 port 2bias combiner to A57 port 2 noise switch (425 Option
029 Only)
1 N5247-20173
W191aCable, assy RF CA, LFE SRC1 J20 - Synth SRC1 J102 1 N5245-60027
W192aCable, assy RF CA, LFE SRC2 J21 - Synth SRC2 J102 1 N5242-60079
W193aCable, assy RF CA, LFE LO J18 - Synth LO J102 1 N5242-60080
W194 Cable (long), assy, coaxial LFE, RF (Port 1 bias combiner “RF-IN” to “Port1” A70 LFE
board)
4 N5240-60097
W195 Cable (long), assy, coaxial LFE, RF (Port 3 bias combiner “RF-IN” to “Port3” A70 LFE
board)
W196 Cable (long), assy, coaxial LFE, RF (Port 4 bias combiner “RF-IN” to “Port4” A70 LFE
board)
W197 Cable (long), assy, coaxial LFE, RF (Port 2 bias combiner “RF-IN” to “Port2” A70 LFE
board
W208bA70/A75 LFE board to A15 DD Synth Source 1 J12 1 N5240-60112
W209bA70 LFE board to A15 DD Synth Source 2 J14 1 N5240-60114
W210bA70/A75 LFE board to A15 DD Synth LO J13 1 N5240-60113
W211 RF cable, A70/A75 LFE J14 to A24 IF Multiplexer P4 1 8120-5014
Table 1 Contents of Upgrade Kit N5247-60113
Ref
Desig. Description Qty Part Number

Installation Note N5247-90113 13
Items Included in the Upgrade Kit
W212 RF cable, A70/A75 LFE J13 to A24 IF Multiplexer P204 1 8120-5017
W213 RF cable, A70/A75 LFE J7 to A24 IF Multiplexer P404 1 8120-5014
W214 RF cable, A70 LFE J12 to A24 IF Multiplexer P604 1 8120-5017
W215 RF cable, A70 LFE J11 to A40 IF Multiplexer P804 (4-port only) 1 8120-5017
a. Version 6 synthesizers use these cables. If you have a Version 7 direct digital synthesizer (DDS) assembly installed, these
cables may be be discarded.
b. Version 7 direct digital synthesizer (DDS) assemblies use these cables. If you have a Version 6 synthesizers installed, these
cables may be discarded.
Extra quantities of items such as protective plastic caps, screws, cable ties,
and cable clamps may be included in this upgrade kit. It is normal for some
of these items to remain unused after the upgrade is completed.
Table 1 Contents of Upgrade Kit N5247-60113
Ref
Desig. Description Qty Part Number

14 Installation Note N5247-90113
Installation Procedure for the Upgrade
-
Installation Procedure for the Upgrade
The network analyzer must be in proper working condition prior to installing
this option. Any necessary repairs must be made before proceeding with this
installation.
Overview of the Installation Procedure
“Step 1. Obtain a Keyword and Verify the Information.”
“Step 2. Remove the Outer Cover.”
“Step 3. Remove the Inner Cover.”
“Step 4. Inspect and (If Necessary) Remove the A4, A15, and A17 Synthesizer
Boards, if They Are Not Version H.”
“Step 5. Remove the Front Panel Assembly.”
“Step 6. Remove the A23 Test Set Motherboard.”
“Step 7. Remove the A24 IF Multiplexer (IF MUX) Board.”
“Step 8. Remove the Existing Test Set Cables.”
“Step 9. Remove the A38–A41 Bias Tee Assemblies.”
“Step 10. Assemble and Install the A71–A74 Bias Tee Combiner Assemblies.”
“Step 11. Connect the A18 Motherboard/IF Multiplexer (IF MUX)/Low
Frequency Extension (LFE)/Test Set Motherboard (TSMB) Ribbon Cable
(N5240-60089).”
“Step 12. Reinstall the A24 IF Multiplexer (IF MUX) Board and Connect the
Motherboard / IF Multiplexer / Low Frequency Extension (LFE)/ Test set
motherboard (MB/IF MUX/LFE/TSMB) ribbon cable (N5240-60089) and the IF
MUX Rear Panel Hardware.”
“Step 13. Reinstall the handler, Power and Other I/O Assemblies.”
“Step 14. Reinstall the Mixer Brick (MXB) Cables.”
“Step 15. Attach Lower Bracket (N5240-00011) to IF MUX Board Shield.”
“Step 16. Connect and Route New LFE Cables (8120-5014 (x2) and
8120-5017 (x3)) to the on the IF Multiplexer (IF MUX) Board.”
This installation requires the removal of the analyzer’s protective
outer covers. The analyzer must be powered down and
disconnected from the mains supply before performing this
procedure.
IMPORTANT! Save all screws, nuts, and washers for reuse that have been
removed.

Installation Note N5247-90113 15
Installation Procedure for the Upgrade
“Step 17. Install A70 Low Frequency Extension (LFE) Board.”
“Step 18. Connect A71-A74 Bias Tee Combiner’s New Cables to A70 Low
Frequency Extension (LFE) Board and the Other Ends of the New Cables
Connected to the IF Multiplier (IF MUX) Board.”
“Step 19. Install the New Bias Tee Combiner’s Semirigid Test Set Cables, the
Blue cables, and Install the Cable Clamps Onto the Ferrite Beads.”
“Step 20. Reinstall the A23 Test Set Motherboard.”
“Step 21. Install the A71 and 74 Bias-Tee Combiner’s Gray Low Frequency
Extension (LFE) DC Bias Cables and Route Cables.”
“Step 22. Install the Other End of the Bias-Tee Combiner Cables to the Source
Synthesizer and LO Synthesizer Board Gray Cables.”
“Step 23. Remove the Old Lower Front Panel Overlay.”
“Step 24. Reinstall the Front Panel Assembly.”
“Step 25. Install the New Lower Front Panel Overlay and Nameplate.”
“Step 26. Reinstall Front Panel Jumpers.”
“Step 27. DC Continuity Test the LFE Board and Test Ports.”
“Step 28. Position the Cables and Wires to Prevent Pinching.”
“Step 29. Reinstall the Inner Cover.”
“Step 30. Reinstall the Outer Cover.”
“Step 31. Remove Option 423 License.”
“Step 32. Enable Option 425.”
“Step 33. Verify the PNA Analyzer Program is Running with the Correct
Options.”
“Step 34. Perform Post-Upgrade Adjustments and Calibration.”
“Step 35. Prepare the PNA for the User.”

16 Installation Note N5247-90113
Installation Procedure for the Upgrade
-
Step 1. Obtain a Keyword and Verify the Information
Follow the instructions on the Software Entitlement Certificate supplied to
obtain a license key for installation of this upgrade. Refer to “License Key
Redemption” on page 7.
Verify that the model number, serial number, and option number information
on the license key match those of the instrument on which this upgrade will be
installed.
Once the license key file has been received and the information verified, you
can proceed with the installation at step 2.
Step 2. Remove the Outer Cover
For instructions, click the Chapter 7 bookmark “Removing the Covers” in the
PDF Service Guide1.
Step 3. Remove the Inner Cover
For instructions, click the Chapter 7 bookmark “Removing the Covers” in the
PDF Service Guide1.
If the model number, serial number, or option number do not match those
on your license key file, you will not be able to install the option. If this is
the case, contact Keysight for assistance before beginning the installation
of this upgrade. Refer to “Contacting Keysight” on page 5.
1. See “Downloading the Online PNA Service Guide” on page 8.

Installation Note N5247-90113 17
Installation Procedure for the Upgrade
Step 4. Inspect and (If Necessary) Remove the A4, A15, and A17
Synthesizer Boards, if They Are Not Version H
Verify that the synthesizer boards are all version H or greater.
1. If your synthesizer boards are all H or greater, on the PNA: Press Utility >
System > Service > Utilities > View EEPROM Headers.
2. Verify the LO Synthesizer, Src1 Synth, and Src2 Synth boards are all
version H or greater.
Refer to Figure 1 on page 17.
Figure 1 EERPOM Header Info Window
The N5240-60074 (with tabs) or N5240-60076 (without tabs) pretested
synthesizer boards will both show Board P/N: N5240-63074 in the
EEPROM window (as shown in Figure 1).
If the synthesizer board part number displayed in the EEPROM Header
window is not N5240-63074 (e.g. N5242-63150), you will need to order
new synthesizer boards. Refer to “Contacting Keysight” on page 5. Refer
to “Contacting Keysight” on page 5.

18 Installation Note N5247-90113
Installation Procedure for the Upgrade
-
3. If all of the boards are version H or greater, proceed to “Step 5. Remove
the Front Panel Assembly”.
4. If your boards are not version H or greater, remove the synthesizer boards
for upgrading:
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A4-A17 Boards” (i.e., refer to your PNA’s serial number prefix section) in the
PDF Service Guide1.
Save all mounting hardware (except the stabilizer bracket) for reuse.
Refer to Appendix A:, “Synthesizer Board Upgrade (N5240-60074 (with
Tabs)/N5240-60076 (Without Tabs) Version F/G to Version H),”.
Step 5. Remove the Front Panel Assembly
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
Front Panel Assembly” in the PDF Service Guide1.
Step 6. Remove the A23 Test Set Motherboard
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A23 Test Set Motherboard” in the PDF Service Guide1.
Step 7. Remove the A24 IF Multiplexer (IF MUX) Board
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A24 IF Multiplexer Board” in the PDF Service Guide1.
Save all mounting hardware (except the stabilizer bracket) for reuse.
IMPORTANT! This step includes disconnecting and laying aside several
gray cables. Ensure that they are labeled.
1. See “Downloading the Online PNA Service Guide” on page 8.
IMPORTANT! This step includes disconnecting and laying aside several
gray cables. Ensure that they are labeled.

Installation Note N5247-90113 19
Installation Procedure for the Upgrade
Step 8. Remove the Existing Test Set Cables
To see an image showing the location of some of the cables, click the Chapter
6 bookmark “Top Cables, All Cables - All Options (S/N Prefixes <6021)” or “Top
Cables, All Cables - All Options (S/N Prefixes ≥6021)” in the PDF Service
Guide1.
And, to see an image showing the location of the other cables, click the
Chapter 6 bookmark and then choose from the following:
— “Bottom RF Cables, 4-Port, Option 423 (, S/N Prefixes <6021)” and then
“Bottom RF Cables, 4-Port, Option 423 with 029 (serial numbers <6021)”1
— “Bottom RF Cables, 4-Port, Option 423 (, S/N Prefixes ≥6021)” and then
“Bottom RF Cables, 4-Port, Option 423 with 029 (, S/N Prefixes ≥6021)”1.
1. Place the analyzer bottom-side up on a flat surface.
2. Remove the following cables in the order listed. Unless otherwise marked,
discard these cables; they will not be reused.
For all analyzers with Option 029:
—N5247-20120 A71 port 1 bias tee to A56 port 1 noise bypass switch
For all analyzers with Option 423 without 029:
—N5247-20058 A32 port 2 ref coupler to front-panel REF 2 SOURCE
OUT
For all analyzers with Option 029:
—N5247-20123 A57 port 2 noise bypass switch to A74 port 2 bias tee
For all analyzers with Option 423 without 029:
—N5247-20081 Front-panel port 1 CPLR THRU to A42 port 1 bias tee
Be careful not to damage the center pins of the semirigid cables. Some
flexing of the cables may be necessary but do not over-bend them.
Leave the gray flexible cables, the wire harnesses, and the ribbon cables
connected where possible. Any that are removed should be labeled for
reconnection later.
When removing a cable, also remove the plastic cable clamp, if present. It
is normal for some of the cable clamp’s adhesive to remain.
1. See “Downloading the Online PNA Service Guide” on page 8.

20 Installation Note N5247-90113
Installation Procedure for the Upgrade
-
For all analyzers:
—N5247-20028 A72 port 3 bias tee to A34 port 3 coupler
—N5247-20010 Port 3 CPLR THRU to A72 port 3 bias tee
—N5247-20022 A33 port 1 coupler to A71 port 1 bias tee
—N5247-20021 Port 4 CPLR THRU to A73 port 4 bias tee
—N5247-20029 A73 port 4 bias tee to A35 port 4 coupler
—N5247-20080 A74 port 2 bias tee to A36 port 2 coupler
For all analyzers with Option 423 without 029:
—N5247-20027 Front-panel port 2 CPLR THRU to A45 port 2 bias tee
For all analyzers:
—N5247-60021 A71 port 1 bias tee to A23 test set motherboard J541
—N5247-60021 A72 port 3 bias tee to A23 test set motherboard J543
—N5247-60021 A73 port 4 bias tee to A23 test set motherboard J544
—N5247-60021 A74 port 2 bias tee to A23 test set motherboard J542
Step 9. Remove the A38–A41 Bias Tee Assemblies
For instructions, click the Chapter 7 bookmark “Removing and Replacing the
A38-A41 Bias Tees” in the PDF Service Guide1.
The bias tee assemblies will not be reused.
1. See “Downloading the Online PNA Service Guide” on page 8.