Keysight 849 Series Service manual

Keysight 8490D/G, 8491A/B,
8493A/B/C Coaxial Fixed
Attenuators
Keysight 11581A, 11582A,
11583C Attenuator Sets
Operating and
Service Manual

2 Keysight 849x and 1158x Operating and Service Manual
Notices
Copyright Notice
© Keysight Technologies 2014 - 2018
No part of this manual may be reproduced in
any form or by any means (including electronic
storage and retrieval or translation into a for-
eign language) without prior agreement and
written consent from Keysight Technologies as
governed by United States and international
copyright laws.
Manual Part Number
08491-90077
Edition
Edition 6, November 27, 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 furnished under a license
and may be used or copied only in accordance
with the terms of such license.
Declaration of Conformity
Declarations of Conformity for this product
and for other Keysight products may be down-
loaded from the Web. Go to http://www.key-
sight.com/go/conformity. You can then search
by product number to find the latest Declara-
tion of Conformity.
U.S. Government Rights
The Software is “commercial computer soft-
ware,” as defined by Federal Acquisition Regu-
lation (“FAR”) 2.101. Pursuant to FAR 12.212
and 27.405-3 and Department of Defense FAR
Supplement (“DFARS”) 227.7202, the U.S.
government acquires commercial computer
software under the same terms by which the
software is customarily provided to the public.
Accordingly, Keysight provides the Software to
U.S. government customers under its standard
commercial license, which is embodied in its
End User License Agreement (EULA), a copy of
which can be found at http://www.key-
sight.com/find/sweula. The license set forth in
the EULA represents the exclusive authority by
which the U.S. government may use, modify,
distribute, or disclose the Software. The EULA
and the license set forth therein, does not
require or permit, among other things, that
Keysight: (1) Furnish technical information
related to commercial computer software or
commercial computer software documenta-
tion that is not customarily provided to the
public; or (2) Relinquish to, or otherwise pro-
vide, the government rights in excess of these
rights customarily provided to the public to
use, modify, reproduce, release, perform, dis-
play, or disclose commercial computer soft-
ware or commercial computer software
documentation. No additional government
requirements beyond those set forth in the
EULA shall apply, except to the extent that
those terms, rights, or licenses are explicitly
required from all providers of commercial
computer software pursuant to the FAR and
the DFARS and are set forth specifically in
writing elsewhere in the EULA. Keysight shall
be under no obligation to update, revise or
otherwise modify the Software. With respect
to any technical data as defined by FAR 2.101,
pursuant to FAR 12.211 and 27.404.2 and
DFARS 227.7102, the U.S. government
acquires no greater than Limited Rights as
defined in FAR 27.401 or DFAR 227.7103-5 (c),
as applicable in any technical data.
Warranty
THE MATERIAL CONTAINED IN THIS DOCU-
MENT IS PROVIDED “AS IS,” AND IS SUBJECT
TO BEING CHANGED, WITHOUT NOTICE, IN
FUTURE EDITIONS. FURTHER, TO THE MAXI-
MUM EXTENT PERMITTED BY APPLICABLE
LAW, KEYSIGHT DISCLAIMS ALL WARRAN-
TIES, EITHER EXPRESS OR IMPLIED, WITH
REGARD TO THIS MANUAL AND ANY INFOR-
MATION CONTAINED HEREIN, INCLUDING
BUT NOT LIMITED TO THE IMPLIED WARRAN-
TIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. KEYSIGHT
SHALL NOT BE LIABLE FOR ERRORS OR FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES
IN CONNECTION WITH THE FURNISHING,
USE, OR PERFORMANCE OF THIS DOCU-
MENT OR OF ANY INFORMATION CONTAINED
HEREIN. SHOULD KEYSIGHT AND THE USER
HAVE A SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS COVERING THE
MATERIAL IN THIS DOCUMENT THAT CON-
FLICT WITH THESE TERMS, THE WARRANTY
TERMS IN THE SEPARATE AGREEMENT
SHALL CONTROL.
Safety Information
CAUTION
A CAUTION notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in damage to the
product or loss of important data. Do not pro-
ceed beyond a CAUTION notice until the indi-
cated conditions are fully understood and met.
WARNING
A WARNING notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in personal injury or
death. Do not proceed beyond a WARNING
notice until the indicated conditions are fully
understood and met.

Keysight 849x and 1158x Operating and Service Manual 3
Printing Copies of Documentation from the Web
To print copies of documentation from the Web, download the PDF file from the Keysight web site:
–Gotohttp://www.keysight.com.
– Enter the document’s part number (located on the Notices page) in the Quick Search box.
– Click GO.
– Click on the hyperlink for the document.
– Click the printer icon located in the tool bar.
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/attenuators
(product-specific information and support, software and documentation updates)
–www.keysight.com/find/assist
(worldwide contact information for repair and service)

4 Keysight 849x and 1158x Operating and Service Manual
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight 849x and 1158x Operating and Service Manual 5
Table of Contents
Printing Copies of Documentation from the Web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Waste Electrical and Electronic Equipment (WEEE) Directive . . . . . . . . . . . . . . . . . . . . 3
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Attenuator overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Optional calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Attenuator sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Initial inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Returning attenuators under warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Operating Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operator’s check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Using oscillator and SWR meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Using network analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Making Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8490D/G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8491A/B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8493A/B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8493C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6 Keysight 849x and 1158x Operating and Service Manual
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight 849x and 1158x Operating and Service Manual 7
List of Figures
Figure 1 Equipment setup using oscillator and SWR meter . . . . . . . . . . . . . . . 21
Figure 2 Equipment setup using network analyzer . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3 2.4-mm/1.85mm connector diagram . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 4 Type-N connector diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 5 SMA connector diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6 3.5-mm connector diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8 Keysight 849x and 1158x Operating and Service Manual
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight 849x and 1158x Operating and Service Manual 9
List of Tables
Table 1 List of coaxial fixed attenuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2 List of coaxial fixed attenuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 3 Specifications for 8490D coaxial fixed attenuator . . . . . . . . . . . . . . . . 13
Table 4 Specifications for 8490G coaxial fixed attenuator . . . . . . . . . . . . . . . . 14
Table 5 Specifications for 8491A and 8493A coaxial fixed attenuators . . . . . . 15
Table 6 Specifications for 8491B and 8493B coaxial fixed attenuators . . . . . . 16
Table 7 Specifications for 8493C coaxial fixed attenuator . . . . . . . . . . . . . . . . 17
Table 8 Accuracy of insertion loss measurements (S21, S12) . . . . . . . . . . . . . . 18
Table 9 Accuracy of reflection coefficient measurements (S11, S22) . . . . . . . . 18
Table 10 849x coaxial fixed attenuator and 1158x attenuator sets environmental
specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 11 SWR verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

10 Keysight 849x and 1158x Operating and Service Manual
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.

Keysight 849x and 1158x Operating and Service Manual 11
General Information
Attenuator overview
The 8490D/G, 8491A/B, and 8493A/B/C are small, light-weight, low-power, 50-ohm coaxial fixed
attenuators.
The attenuators cover broad frequency ranges and choice of connector types. Each model comes
with Options to accommodate various attenuation values as shown in Table 1.
Table 1 List of coaxial fixed attenuators
The Option number indicates the attenuation value. For example, Option 003 indicates 3 dB
attenuation, Option 010 indicates 10 dB attenuation, and so on.
Features
– Ruggedness, reliability, and small size make these attenuators useful both on the bench and in
systems applications.
– Accuracy and low SWRs make the attenuators well suited for extending the range of sensitive
power meters for higher power measurements and applications such as calibration standards
and RF substitution measurements.
– Each attenuator is tested with a vector network analyzer for attenuation, and a plot of actual
attenuation values is printed on the label attached to the body of the attenuator (except for the
8490D/G and 8493C).
Model Option Frequency range Connector type
8490D 003, 006, 010, 020, 030, 040 DC to 50 GHz 2.4 mm (m), (f)
8490G 003, 006, 010, 020, 030, 040 DC to 67 GHz 1.85mm (m), (f)
8491A 003, 006, 010, 020, 030, 040, 050, 060 DC to 12.4 GHz Type N (m), (f)
8491B 003, 006, 010, 020, 030, 040, 050, 060 DC to 18 GHz Type N (m), (f)
8493A 003, 006, 010, 020, 030 DC to 12.4 GHz SMA 3 mm (m), (f)
8493B 003, 006, 010, 020, 030 DC to 18 GHz SMA 3 mm (m), (f)
8493C 003, 006, 010, 020, 030, 040 DC to 26.5 GHz 3.5 mm (m), (f)

12 Keysight 849x and 1158x Operating and Service Manual
Optional calibration data
Option UK6 calibration data, which is generated by a network analyzer, provides a tabulated list of
attenuations and reflection coefficients in which the number of frequency points provided depends
on the model number and frequency range. Option UK6 calibration data is available when
attenuators are first purchased and recalibrations are available through Keysight Technologies
Service Centers.
Attenuator sets
The 11581A, 11582A, and 11583C are boxed sets of four coaxial fixed attenuators of 3, 6, 10, and
20 dB as shown in Table 2.
Each attenuator set comes with a printed calibration report that gives the actual attenuation and
reflection coefficient of each port at frequencies from 100 MHz to 12.4 GHz for 11581A, 100 MHz
to 18 GHz for 11582A, and 100 MHz to 26.5 GHz for 11583C, at increments from 100 to 500 MHz.
Table 2 List of coaxial fixed attenuators
Model Contents Frequency range
11581A 8491A (3, 6, 10, and 20 dB) DC to12.4 GHz
11582A 8491B (3, 6, 10, and 20 dB) DC to 18 GHz
11583C 8493 C (3, 6, 10, and 20 dB) DC to 26.5 GHz

Keysight 849x and 1158x Operating and Service Manual 13
Specifications
The specifications refer to the performance standards or limits against which the coaxial fixed
attenuators are tested.
Table 3 Specifications for 8490D coaxial fixed attenuator
Minimum attenuation in dB Maximum attenuation in dB
Option[a]
[a] Option numbers indicate the attenuation values. For example, Option 003 indicates 3 dB attenuation, Option 010 indicates 10 dB
attenuation and so on.
DC to 50 GHz DC to 26.5 GHz 26.5 to 50 GHz
003 2.5 3.9 4.8
006 5.4 6.9 7.8
010 9.4 10.9 11.3
020 19.2 21.3 21.7
030 29.2 31.3 31.7
040 38.2 42.5 42.5
Maximum SWR
Option[a] DC to 26.5 GHz 26.5 to 40 GHz 40 to 50 GHz
003 1.15 1.25 1.45
006 1.15 1.25 1.45
010 1.15 1.25 1.45
020 1.15 1.25 1.45
030 1.15 1.25 1.45
040 1.08 1.15 1.25
Maximum input power 1 W avg, 100 W pk
Connectors (50 Ω)2.4mm
Dimension (length) 1.06 in. (27 mm) for Options 003, 006, 010, 020
1.14 in. (29 mm) for Options 030, 040
Diameter 0.312 in. (8 mm)

14 Keysight 849x and 1158x Operating and Service Manual
Table 4 Specifications for 8490G coaxial fixed attenuator
Minimum
attenuation in dB Maximum attenuation in dB
Option[a] DC to 67 GHz DC to 26.5 GHz 26.5 to 50 GHz 50 to 67 GHz
003 2.5 3.9 4.4 4.8
006 5.4 6.9 7.4 7.8
010 9.4 10.9 11.1 11.3
020 19.2 21.3 21.5 21.7
030 29.2 31.3 31.5 31.7
040 38.0 42.5 42.5 42.5
Maximum SWR
Option[a]
[a] Option numbers indicate the attenuation values. For example, Option 003 indicates 3 dB attenuation, Option 010 indicates 10 dB
attenuation and so on.
DC to 26.5 GHz 26.5 to 40 GHz 40 to 50 GHz
003 1.15 1.25 1.45
006 1.15 1.25 1.45
010 1.15 1.25 1.45
020 1.15 1.25 1.45
030 1.15 1.25 1.45
040 1.08 1.15 1.25
Maximum input power 1 W avg, 100 W pk
Connectors (50 Ω)1.85mm
Dimension (length) 1.06 in. (27 mm) for Options 003, 006, 010, 020
1.10 in. (28 mm) for Options 030, 040
Diameter 0.312 in. (8 mm)

Keysight 849x and 1158x Operating and Service Manual 15
Table 5 Specifications for 8491A and 8493A coaxial fixed attenuators
Attenuation accuracy in dB
Option[a]
[a] Option numbers indicate the attenuation values. For example, Option 003 indicates 3 dB attenuation, Option 010 indicates 10 dB
attenuation and so on.
DC to 12.4 GHz
003 ± 0.3
006 ± 0.3
010 ± 0.5
020 ± 0.5
030 ± 1.0
040[b]
[b] Options 040, 050, and 060 are not available for 8493A.
± 1.5
050[b] ± 1.5
060[b] ± 2.0
SWR
Option[a] DC to 8 GHz 8 to 12.4 GHz
003 1.25 1.35
006 1.2 1.3
010 1.2 1.3
020 1.2 1.3
030 1.2 1.3
040[b] 1.2 1.3
050[b] 1.2 1.3
060[b] 1.2 1.3
Maximum input power 2 W avg, 100 W pk
Connectors (50 Ω)8491A: Type N[c]
[c] Mate with MIL-C-71 and MIL-C-39012 connectors.
8493A: SMA[d]
[d] Miniature SMA type.
Dimension (length) 8491A: 2-7/16 in. (67 mm) 8493A: 1-9/16 in. (40 mm)
Diameter 8491A: 13/16 in. (21 mm) 8493A: 1/2 in. (13 mm)

16 Keysight 849x and 1158x Operating and Service Manual
Table 6 Specifications for 8491B and 8493B coaxial fixed attenuators
Attenuation accuracy in dB
Option[a] DC to 12.4 GHz 12.4 to 18 GHz
003 ± 0.3 ± 0.3
006 ± 0.3 ± 0.4
010 ± 0.6 ± 0.6
020 ± 0.6 ± 1.0
030 ± 1.0 ± 1.0
040[b] ± 1.5 ± 1.5
050[b] ± 1.5 ± 1.5
060[b] ± 2.0 ± 2.0
SWR
Option[a]
[a] Option numbers indicate the attenuation values. For example, Option 003 indicates 3 dB attenuation, Option 010 indicates 10 dB
attenuation and so on.
DC to 26.5 GHz 26.5 to 40 GHz 40 to 50 GHz
003 1.25 1.3 1.5
006 1.2 1.3 1.5
010 1.2 1.3 1.5
020 1.2 1.3 1.5
030 1.2 1.3 1.5
040[b]
[b] Options 040, 050, and 060 are not available for 8493B.
1.2 1.3 1.5
050[b] 1.2 1.3 1.5
060[b] 1.2 1.3 1.5
Maximum input power 2 W avg, 100 W pk
Connectors (50 Ω)8491A: Type N[c]
[c] Mate with MIL-C-71 and MIL-C-39012 connectors.
8493A: SMA[d]
[d] Miniature SMA type.
Dimension (length) 8491A: 2-7/16 in. (67 mm) 8493A: 1-9/16 in. (40 mm)
Diameter 8491A: 13/16 in. (21 mm) 8493A: 1/2 in. (13 mm)

Keysight 849x and 1158x Operating and Service Manual 17
Table 7 Specifications for 8493C coaxial fixed attenuator
Table 8 and Table 9 apply to the following boxed sets of four attenuators.
– The 11581A attenuator set contains a 3, 6, 10, and 20 dB 8491A.
– The 11582A attenuator set contains a 3, 6, 10, and 20 dB 8491B.
– The 11583C attenuator set contains a 3, 6, 10, and 20 dB 8493C.
Attenuation Accuracy in dB
Option[a] DC to 18 GHz 18 to 26.5 GHz
003 ± 0.5 ± 1.0
006 ± 0.6 ± 0.6
010 ± 0.3 ± 0.5
020 ± 0.5 ± 0.6
030 ± 0.7 ± 1.0
040 ± 1.0 ± 1.3
SWR
Option[a]
[a] Option numbers indicate the attenuation values. For example, Option 003 indicates 3 dB attenuation, Option 010 indicates 10 dB
attenuation and so on.
DC to 8 GHz 8 to 12.4 GHz 12.4 to 26.5 GHz
003 1.10 1.15 1.25
006 1.10 1.15 1.27
010 1.10 1.15 1.25
020 1.10 1.15 1.25
030 1.10 1.15 1.25
040 1.10 1.15 1.25
Maximum input power 2 W avg, 100 W pk
Connectors (50 Ω)3.5mm
Dimension (length) 1-15/16 in. (33.8 mm) for Options 003, 006, 010, 020
1-7/16 in. (36.8 mm) for Options 030, 040
Diameter 5/16 in. (8 mm)

18 Keysight 849x and 1158x Operating and Service Manual
Table 8 Accuracy of insertion loss measurements (S21, S12)
Table 9 Accuracy of reflection coefficient measurements (S11, S22)
Attenuation DC to 4 GHz 4 to 12 GHz 12 to 18 GHz
3 dB ± 0.01 dB ± 0.06 dB ± 0.11 dB
6 dB ± 0.01 dB ± 0.07 dB ± 0.11 dB
10 dB ± 0.01 dB ± 0.07 dB ± 0.12 dB
20 dB ± 0.01 dB ± 0.08 dB ± 0.13 dB
Female Male
Model 4 to 12 GHz 12 to 18 GHz 4 to 12 GHz 12 to 18 GHz
11581A ± 0.006 dB - ± 0.006 dB -
11582A ± 0.006 dB ± 0.010 dB ± 0.006 dB ± 0.006 dB
11583C ± 0.007 dB ± 0.007 dB ± 0.007 dB ± 0.007 dB

Keysight 849x and 1158x Operating and Service Manual 19
Environmental Specifications
The 849x coaxial fixed attenuators and 1158x attenuator sets are designed to fully comply with
Keysight Technologies’ product operating environmental specifications as shown Table 10.
Table 10 849x coaxial fixed attenuator and 1158x attenuator sets environmental
specifications
Temperature Humidity Altitude
Operating 0 °C to +55 °C |95% relative at 40 °C |4,600 meters (15,000 feet)
Storage –55 °C to +85 °C |95% relative at 40 °C |15,300 meters (50,000 feet)

20 Keysight 849x and 1158x Operating and Service Manual
Installation
Initial inspection
1Inspect the shipping container for damage. If the shipping container or cushioning material is
damaged, it should be kept until the contents of the shipment have been checked for
completeness and the instrument has been checked both mechanically and electrically.
– Check for mechanical damage such as scratches or dents.
– Procedures for checking electrical performance are given under “Operator's Check” or
“Performance Tests”.
2If the contents are incomplete, if there is mechanical damage or defect, or if the instrument
does not pass the electrical performance test, contact the nearest Keysight Technologies Sales
and Service office. Refer to the Service and Support information in the front matter of this
manual. 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 Service and
Support information in the front matter of this manual for the Keysight Technologies nearest
you. Attach a tag indicating the type of service required, return address, model number, and
serial number. Mark the container FRAGILE to insure careful handling. In any correspondence,
refer to the instrument by model number and serial number.
Returning attenuators under warranty
“Bad contacts” attenuators are returnable under warranty while “burned out” attenuators are not.
These terms are defined as follows:
– “Bad contacts”: Attenuation is within specifications at 8 GHz or higher; attenuation is at least
3 to 5 dB higher than specification at DC and 1 kHz.
– “Burned out”: Attenuation is at least 3 to 5 dB higher than specification at DC and entire rated
frequency range.