Keysight X281C Service manual

Keysight X/P/K281C
Adapters
Including Options 006, 012, 013, 106
Operating and
Service Manual

2 Keysight X/P/K281C Operating and Service Manual
Notices
Copyright Notice
© Keysight Technologies 1996 - 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
00281-90043
Edition
Edition 4, November 9, 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
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to, or otherwise provide, the govern-
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computer software or commercial com-
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additional government requirements
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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 X/P/K281C 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.
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.

4 Keysight X/P/K281C 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 X/P/K281C 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/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 X/P/K281C Operating and Service Manual 7
Table of Contents
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Earth Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Before Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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
1Introduction
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Instruments covered by manual . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2Installation
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Operation and Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Operating procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Performance test – SWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3 Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Mechanical Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Pin depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

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Keysight X/P/K281C Operating and Service Manual 9
List of Figures
Figure 1-1 K281C Option 006 waveguide alignment holes . . . . .15
Figure 3-1 Typical SWR variation versus center conductor gap .23
Figure 3-2 Type-N connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 3-3 3.5-mm connectors . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 3-4 7-mm connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

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Keysight X/P/K281C Operating and Service Manual 11
List of Tables
Table 1-1 Option 006 alignment hole measurement dimensions 14
Table 3-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Table 3-2 Connector types for standard and options . . . . . . . . .24
Table 3-3 Keysight X/P/K281C environmental specifications . . .27

12 Keysight X/P/K281C Operating and Service Manual
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Keysight X/P/K281C Adapters
Operating and Service Manual
13
1 Introduction
Product Overview 14
This chapter provides an overview of the Keysight X/P/K281C Adapters.

1Introduction
14 Keysight X/P/K281C Operating and Service Manual
Product Overview
The X281C, P281C, and K281C 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.
A step- like internal structure transforms the waveguide impedance to the 50 ?
impedance of the coaxial line.
Options
Option 006
Option 006 adds two alignment holes to the waveguide flange. The dimensions of
the Option 006 alignment holes are provided in the following table.
Table 1-1 Option 006 alignment hole measurement dimensions
Model
Alignment Hole
Diameter “A” Dimension “B” Dimension “C”
X281C 3.175 mm (+0.014 to 0.0) 15.49 mm 16.26 mm
P281C
3.175 mm (+0.014 to 0.0) 12.62 mm 12.14 mm
K281C
2.381 mm (+0.014 to 0.0) 8.13 mm 8.51 mm

Introduction 1
Keysight X/P/K281C Operating and Service Manual 15
Figure 1-1 K281C Option 006 waveguide alignment holes
Option 012
Option 012 for the X281C offers a Type- N (m) connector to replace the standard
7- mm connector.
Option 012 for the K281C offers a 3.5 mm (m) connector to replace the standard
3.5 mm (f) connector.
Option 013
Option 013 for the X281C offers a Type- N (f) connector to replace the standard 7-
mm connector. Option 013 is not offered for the K281C and the P281C.
Option 106
Option 106 is only available for the K281C. It replaces the standard 3.5 mm (f)
connector with a 3.5 mm (m) connector and adds two alignment holes to the
waveguide flange. The dimensions of the alignment holes are identical to Option
006 for the K281C as shown in Table 1-1.

1Introduction
16 Keysight X/P/K281C Operating and Service Manual
Instruments covered by manual
The adapters covered by this manual have a two-part serial number. The first four
digits and letter constitute the serial number prefix. The last five digits form the
sequential suffix that is unique to each adapter. The contents of this manual apply
to adapters prefixed at 3032A and above.

Keysight X/P/K281C Adapters
Operating and Service Manual
17
2 Installation
Initial Inspection 18
Operation and Safety Precautions 19
This chapter provides you important information on how to check and prepare
your instrument for operation.

2Installation
18 Keysight X/P/K281C 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.
2If the contents are damaged or defective, contact your nearest Keysight
Technologies Service and Support Office. Refer to “Sales and Technical
Support” on page 5. 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 5 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 X/P/K281C Operating and Service Manual 19
Operation and Safety Precautions
Observe the following guidelines before connecting or operating the adapter.
Operating procedure
Use the following procedure when you connect an adapter to a waveguide.
1Make sure the rectangular ports are oriented the same way; that is, 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 waveguide connections and flange
distortion may result in leakage and mismatch.
CAUTION
– Exceeding the allowable energy and power levels may result in damage
to the adapter or associated equipment.
– 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 may increase RF leakage and the reflection
coefficient of the waveguide connection. The supplied plastic cover
should be used to protect the flange when the adapter is not in use.
– The power that can be handled will be a function of the size of the center
conductor. The majority of the heat flow will be via conduction. The weak
point is the coax portion. The waveguide portion is capable of higher
power. These numbers are assuming an ambient temperature of 25 °C
and an altitude of sea level. Higher ambient temperatures and altitude
would degrade power-handling capability.

2Installation
20 Keysight X/P/K281C Operating and Service Manual
Performance test – SWR
The maximum SWR for the adapters are shown in Table 3-1 and Figure 3-1. When
making these measurements, the test results must be less that those listed in
Table 3-1 plus the measurement uncertainty of the measuring 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.
Adjustments
Adjustments should not be made unless the adapter does not meet specifications,
or unless the unit has been physically damaged.