Keysight P281B Service manual

Keysight 281A/B Adapters
Operating and
Service Manual

2 Keysight 281A/B Operating and Service Manual
Notices
Copyright Notice
© Keysight Technologies 2000 - 2018
No part of this manual may be repro-
duced 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 Technol-
ogies as governed by United States and
international copyright laws.
Manual Part Number
00281-90045
Edition
Edition 4, November 21, 2018
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 fur-
nished 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 prod-
ucts may be downloaded from the
Web. Go to http://www.keysight.com/
go/conformity. You can then search by
product number to find the latest Dec-
laration of Conformity.
U.S. Government Rights
The Software is “commercial computer
software,” as defined by Federal Acqui-
sition Regulation (“FAR”) 2.101. Pursu-
ant to FAR 12.212 and 27.405-3 and
Department of Defense FAR Supple-
ment (“DFARS”) 227.7202, the U.S.
government acquires commercial com-
puter 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 stan-
dard 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 Soft-
ware. The EULA and the license set
forth therein, does not require or per-
mit, among other things, that Keysight:
(1) Furnish technical information
related to commercial computer soft-
ware or commercial computer software
documentation that is not customarily
provided to the public; or (2) Relinquish
to, or otherwise provide, the govern-
ment rights in excess of these rights
customarily provided to the public to
use, modify, reproduce, release, per-
form, display, or disclose commercial
computer software or commercial com-
puter 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 pursu-
ant to the FAR and the DFARS and are
set forth specifically in writing else-
where 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
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 DIS-
CLAIMS ALL WARRANTIES, EITHER
EXPRESS OR IMPLIED, WITH REGARD
TO THIS MANUAL AND ANY INFORMA-
TION CONTAINED HEREIN, INCLUD-
ING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. KEYSIGHT
SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR CONSE-
QUENTIAL DAMAGES IN CONNECTION
WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT
OR OF ANY INFORMATION CON-
TAINED HEREIN. SHOULD KEYSIGHT
AND THE USER HAVE A SEPARATE
WRITTEN AGREEMENT WITH WAR-
RANTY TERMS COVERING THE MATE-
RIAL IN THIS DOCUMENT THAT
CONFLICT 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 proce-
dure, 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 indicated conditions are fully
understood and met.
WARNING
A WARNING notice denotes a hazard. It
calls attention to an operating proce-
dure, 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 281A/B Operating and Service Manual 3
Certification
Keysight Technologies certifies that this product met its published specifications
at the time of shipment. Keysight further certifies that its calibration
measurements are traceable to the United States National Institute of Standard
and Technology (formerly National Bureau of Standards), to the extent allowed by
that organization’s calibration facility, and to the calibration facilities of other
International Standards Organization members.
Warranty
Custom systems are warranted by contractual agreement between Keysight
Technologies and the customer.
This Keysight Technologies system product is warranted against defects in
materials and workmanship for a period corresponding to the individual warranty
periods of its component products. Instruments are warranted for a period of one
year. During the warranty period, Keysight Technologies will, at its option, either
repair or replace products that prove to be defective.
Warranty service for products installed by Keysight Technologies and certain
other products designated by Keysight Technologies will be performed at Buyer’s
facility at no charge within Keysight Technologies service travel areas. Outside
Keysight Technologies service travel areas, warranty service will be performed at
Buyer’s facility only upon Keysight Technologies’ prior agreement and Buyer shall
pay Keysight Technologies’ round trip travel expenses. In all other areas, products
must be returned to a service facility designated by Keysight Technologies.
For products returned to Keysight Technologies for warranty service, Buyer shall
prepay shipping charges to Keysight Technologies and Keysight Technologies
shall pay shipping charges to return the product to Buyer. However, Buyer shall
pay all shipping charges, duties, and taxes for products returned to Keysight
Technologies from another country.
Keysight Technologies warrants that its software and firmware designated by
Keysight Technologies for use with an instrument will execute its programming
instructions when properly installed on that instrument. Keysight Technologies
does not warrant that the operation of the instrument, or software, or firmware
will be uninterrupted or error free.

4 Keysight 281A/B Operating and Service Manual
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.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. KEYSIGHT TECHNOLOGIES
SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES. THE REMEDIES PROVIDED HEREIN ARE BUYER’S
SOLE AND EXCLUSIVE REMEDIES. KEYSIGHT TECHNOLOGIES SHALL NOT BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY
OTHER LEGAL THEORY.
YEAR 2000. Keysight Technologies warrants that each Keysight Technologies
hardware, software, and firmware product on Keysight Technologies’ Corporate
Price List (dated July 1, 1998 or later) delivered under the product’s contract of
sale will be able to accurately process date data (including, but not limited to,
calculating, comparing, and sequencing) from, into, and between the twentieth
and twenty-first centuries, and the years 1999 and 2000, including leap year
calculations, when used in accordance with the product documentation
provided that all other products (that is, hardware, software, firmware) used in
combination with such Keysight Technologies product(s) properly exchange date
data with it. If the agreement requires that specific Keysight Technologies
products must perform as a system in accordance with the foregoing warranty,
then that warranty will apply to those Keysight
Technologies products as a system, and Customer retains sole responsibility to
ensure the year 2000 readiness of its information technology and business
environment. The duration of this warranty extends through January 31, 2001.
The remedies available under this warranty will be defined in, and subject to, the
terms and limitations of the warranties contained in the contract of sale. To the
extent permitted by local law, this warranty applies only to branded Keysight
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.

Keysight 281A/B Operating and Service Manual 5
Assistance
Product maintenance agreements and other customer assistance agreements are
available for Keysight Technologies products.
For assistance, call your local Keysight Technologies Sales and Service Office
(Refer to “Sales and Technical Support” on page 7).
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.
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 an autotransformer, make sure the common terminal
is connected to the neutral (grounded) side of the ac power supply.

6 Keysight 281A/B Operating and Service Manual
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.
Regulatory Markings
This symbol indicates that 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.
The CE mark is a registered trademark
of the European Community. If it is
accompanied by a year, it indicates the
year the design was proven.
The RCM mark is a registered
trademark of the Australian
Communications and Media Authority.
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 ISM device complies with
Canadian ICES-001.
Cet appareil ISM est conforme a la
norme NMB du Canada

Keysight 281A/B Operating and Service Manual 7
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/adapters
(product-specific information and support, software and
documentation updates)
–www.keysight.com/find/assist
(worldwide contact information for repair and service)

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Keysight 281A/B Operating and Service Manual 9
Table of Contents
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . .7
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1Introduction
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2Installation
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Protect flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Operating procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Performance test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3 Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Mechanical Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Connector types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

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Keysight 281A/B Operating and Service Manual 11
List of Figures
Figure 1-1 Adapters showing flange types and coaxial connector
styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Figure 3-1 Dimensions of Type N connectors . . . . . . . . . . . . . . . .23

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Keysight 281A/B Operating and Service Manual 13
List of Tables
Table 3-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Table 3-2 Dimensions of Type N connectors . . . . . . . . . . . . . . . .24

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Keysight 281A/B Adapters
Operating and Service Manual
15
1 Introduction
Product Overview 16
This chapter provides an overview of the Keysight 281A/B Adapters.

1Introduction
16 Keysight 281A/B Operating and Service Manual
Product Overview
Keysight 281 adapters provide a convenient means of coupling between
waveguide and coaxial systems. Power can be transmitted in either direction, and
each adapter covers the full frequency range of its waveguide size with an SWR
of less than 1.30. The flanges are lapped to a slight, controlled convexity to assure
minimum leakage at the waveguide joint. A probe transforms the waveguide
impedance to the 50-Wimpedance of coaxial line. Complete specifications for the
adapters are given in Table 3-1.
Examples of the waveguide flange and coaxial connectors used on these
adapters are shown in Figure 1-1. One type of flange and two types of coaxial
connectors are used: Type N female connectors (which are compatible with
connectors conforming to MILS-71), are available on all 281A adapters and
Amphenol precision 7-mm connectors (available on the 281B adapters). The
7-mm connector features precise alignment, a clearly defined reference plane,
and low RF leakage. In addition, any pair can be connected together without an
adapter. Option 013 adapters have stainless steel Type N female connectors and
are available on the P281B.
Figure 1-1 Adapters showing flange types and coaxial connector styles

Keysight 281A/B Adapters
Operating and Service Manual
17
2 Installation
Initial Inspection 18
Operation 20
This chapter provides you important information on how to check and prepare
your instrument for operation.

2Installation
18 Keysight 281A/B Operating and Service Manual
Initial Inspection
1Unpack and inspect the shipping container and its contents thoroughly to
ensure that nothing was damaged during shipment. If the shipping container
or cushioning material is damaged, the contents should be checked both
mechanically and electrically. Check for mechanical damage such as
scratches or dents. If the shipping container is not damaged, check the
packaging material for signs of stress that indicate rough handling in transit. If
the adapter appears undamaged, perform the electrical check.
The electrical performance of the adapter should be checked as soon as
possible after receipt against the specifications shown in Table 3-1 on
page 22. If the adapter does not perform within the specifications, see the
following steps for recommended claim procedure and repackaging the
instrument.
2If the contents are damaged or defective, contact your nearest Keysight
Technologies Service and Support Office. Refer to “Sales and Technical
Support” on page 7. Keysight Technologies 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 under warranty or for service, repackaging
the instrument requires original shipping containers and materials or their
equivalents. Keysight Technologies can provide packaging materials identical
to the original materials. Refer to “Sales and Technical Support” on page 7 for
the Keysight Technologies nearest to you. Attach a tag indicating the type of
service required, return address, model number, and serial number. Mark the
container FRAGILE to assure careful handling. In any correspondence, refer to
the instrument by its model number and serial number.

Installation 2
Keysight 281A/B Operating and Service Manual 19
4If you are repackaging the instrument with commercially available materials,
use the following general instructions:
aWrap the adapter in heavy paper or plastic. (If shipping to an Keysight
Technologies office or service center, attach a tag indicating the type of
service required, return address, model number, and serial number.)
bUse a strong shipping container. A double-wall carton made of 350-pound
test material is adequate.
cUse enough shock-absorbing material (3 to 4-inch layer) around all sides of
the adapter to provide firm cushioning and prevent movement inside the
container.
dSeal the shipping container securely.
eMark the shipping container FRAGILE to assure careful handling.

2Installation
20 Keysight 281A/B Operating and Service Manual
Operation
Protect flanges
Care should be taken to protect the face of the flange from any damage that
would prevent close surface-to-surface contact. Any burring, denting, or
scratching will increase RF leakage and the reflection coefficient of the joint. The
supplied plastic cover should be used to protect the flange when the adapter is
not in use.
Operating procedure
Use the following procedure when you connect an adapter to a waveguide.
1Make sure the rectangular ports are oriented the same way (i.e., not
“cross-guided”).
2Align ports carefully to minimize reflections.
3Clamp or bolt flanges securely together so that pressure is evenly distributed
over the contacting surfaces. Loose joints and flange distortion result in
leakage and mismatch.
Performance test
The maximum SWR for the adapters are listed in Table 3-1 on page 22. When
making these measurements, the test results must be less than those listed in
Table 3-1 plus the measurement uncertainty of the measurement system.
Measurements may be made using a standard reflectometer setup. To ensure
satisfactory performance, make sure flanges and coaxial connectors are not
damaged or worn.