Keysight U2751A Manual

Keysight U2751A USB
Modular Switch Matrix
User’s and
Service Guide

4 Keysight U2751A User’s and Service Guide
Notices
Copyright Notice
© Keysight Technologies 2008-2020
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 as governed by
United States and international
copyright laws.
Trademarks
Pentium is a U.S. registered trademark
of Intel Corporation.
Microsoft, Visual Studio, Windows, and
MS Windows are trademarks of
Microsoft Corporation in the United
States and/or other countries.
Manual Part Number
U2751-90011
Edition
Edition 8, June 12, 2020
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 downloaded from the
Web. Go to http://www.keysight.com/
go/conformity. You can then search by
product number to find the latest
Declaration of Conformity.
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.
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
TO THIS MANUAL AND ANY
INFORMATION CONTAINED HEREIN,
INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES 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 DOCUMENT
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 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
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.
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 U2751A User’s and Service Guide 5
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.
Direct current (DC) Off (supply)
Alternating current (AC) On (supply)
Both direct and alternating current Caution, risk of electric shock
Three-phase alternating current
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Earth (ground) terminal Caution, hot surface
Protective conductor terminal Out position of a bi-stable push control
Frame or chassis terminal In position of a bi-stable push control
Equipotentiality CAT I Measurements performed on circuits
not directly connected to MAINS
Equipment protected throughout by
double insulation or reinforced
insulation

6 Keysight U2751A User’s and Service Guide
General Safety Information
WARNING
– Do not operate the device around explosive gas, vapor, dust or wet
environments.
– Observe all markings on the device before establishing any connection.
– The device is under CAT I measurement category, do not connect the
25-pin connector to MAINS.
– Do not measure higher than the rated voltage (as marked on the device).
– Do not operate the device with the cover removed or loosened.
– Use only the power adapter provided by the manufacturer to avoid any
unexpected hazards.
CAUTION
– Electrostatic discharge (ESD) can cause damage to the components in
the instrument and accessories. The cables or wires should be connected
to the plug-in connectors first and covered with the wire casing prior to
plugging it into the output connector to prevent ESD from occurring.
– If the device is used in a manner not specified by the manufacturer, the
device protection may be impaired.
– Clean the case with a soft, lint-free, slightly dampened cloth. Do not use
detergent, volatile liquids, or chemical solvents.
– Do not permit any blockage of the ventilation holes of the device.
– The instrument is designed for use in Overvoltage Category II and
Pollution Degree 2.
CAT I:
Maximum working voltage:
Standalone 35 Vrms
Modular (Used with U2781A) 180 Vrms
Maximum transient voltage: 300 Vrms

Keysight U2751A User’s and Service Guide 7
Environmental Conditions
This instrument is designed for indoor use and in an area with low condensation.
The table below shows the general environmental requirements for this
instrument.
Environmental conditions Requirements
Operating temperature 0 °C to 50 °C
Operating humidity 20% to 85% RH non-condensing
Storage temperature –20 °C to 70 °C
Storage humidity 5% to 90% RH non-condensing
Altitude up to 2000 m
CAUTION
The U2751A USB Modular Switch Matrix complies with the following safety
and EMC requirements.
– IEC 61010-1/EN61010-1
– IEC61010-2-030/EN61010-2-030
– Canada:
– CAN/CSA-C22.2 No. 61010-1-12
– CAN/CSA-C22.2 No. 61010-030-12
– ICES/NMB-001
–USA:
– ANSI/UL Std No. 61010-1
– ANSI/UL Std No. 61010-2-030
– IEC61326-1/EN61326-1
– Australia/New Zealand: AS/NZS CISPR11

8 Keysight U2751A User’s and Service Guide
Regulatory Markings
The CE mark is a registered trademark
of the European Community. This CE
mark shows that the product complies
with all the relevant European Legal
Directives.
The RCM mark is a registered
trademark of the Australian
Communications and Media Authority.
ICES/NMB-001 indicates that this ISM
device complies with the Canadian
ICES-001.
Cet appareil ISM est conforme a la
norme NMB-001 du Canada.
This instrument complies with the
WEEE Directive (2002/96/EC) marking
requirement. This affixed product label
indicates that you must not discard
this electrical/electronic product in
domestic household waste.
The CSA mark is a registered
trademark of the Canadian Standards
Association.

Keysight U2751A User’s and Service Guide 9
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC
This instrument complies with the WEEE Directive (2002/96/EC) 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/U2751A
(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 U2751A User’s and Service Guide 11
Table of Contents
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Regulatory Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Waste Electrical and Electronic Equipment (WEEE) Directive
2002/96/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Product category: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
1 Getting Started
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Product at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Product Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Product Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Dimensions Without Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Dimensions With Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Standard Shipped Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Inspection and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Electrical Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Installation and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
U2751A DSub Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
U2922A Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
U2922A Terminal Block Installation . . . . . . . . . . . . . . . . . . . . . . . . .30
55-Pin Backplane Connector Pin Configuration . . . . . . . . . . . . . . . .32
Chassis Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

12 Keysight U2751A User’s and Service Guide
2 Operation and Features
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Switch Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Relay Cycle Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
System-Related Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SCPI Commands for System-Related Tasks . . . . . . . . . . . . . . . . . . . 42
3Characteristicsand Specifications
4ServiceInformation
Checking Defective Relay(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Reassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Contacting Keysight Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Index

Keysight U2751A User’s and Service Guide 13
List of Figures
Figure 1-1 25-pin male DSub connector . . . . . . . . . . . . . . . . . . . .26
Figure 1-2 U2922A pin configuration . . . . . . . . . . . . . . . . . . . . . .27
Figure 1-3 U2922A outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 1-4 U2922A dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Figure 1-5 55-pin backplane connector pin configuration . . . . . .32
Figure 2-1 Switch matrix concept . . . . . . . . . . . . . . . . . . . . . . . . .37
Figure 2-2 Panel view of the Keysight Measurement Manager . .38
Figure 2-3 Panel view of the relay cycle counter . . . . . . . . . . . . .40
Figure 4-1 Defective relay(s) check . . . . . . . . . . . . . . . . . . . . . . . .46

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Keysight U2751A User’s and Service Guide 15
List of Tables
Table 1-1 Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Table 1-2 Synchronous Simultaneous Interface (SSI) connector
pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Table 4-1 Part number and description of replaceable part . . . .47

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Keysight U2751A USB Modular Switch Matrix
User’s and Service Guide
17
1 Getting Started
Introduction 18
Product at a Glance 19
Product Dimensions 21
Standard Shipped Items 23
Inspection and Maintenance 24
Installation and Configuration 25

1 Getting Started
18 Keysight U2751A User’s and Service Guide
Introduction
The U2751A USB Modular Switch Matrix offers a high quality, low cost switching
solution for automated test. It can operate as a standalone or modular unit when
used with the U2781A USB modular instrument chassis.
The U2751A is a compact 4×8, two-wire modular switch matrix which is controlled
remotely over a USB interface via the Keysight Measurement Manager software.
The U2751A can also be programmed using the provided drivers or via SCPI
commands.
The U2751A has the following features.
– 32 two-wire cross-points organized in a 4 rows by 8 columns configuration
– any combination of rows and columns can be connected at a time. Multiple
channels can be closed at the same time
– relay cycle counter
The U2751A offers you the most flexible connection path between your device
under test (DUT) and your test equipment, allowing different instruments to be
connected to multiple points on your DUT at the same time.
Using the Keysight Measurement Manager, you can instruct the matrix to make or
break any of the 32 row-column intersections over the USB interface. More details
will be covered in the Keysight Measurement Manager help file.

Getting Started 1
Keysight U2751A User’s and Service Guide 19
Product at a Glance
Product Outlook
Top View
Bumpers

1 Getting Started
20 Keysight U2751A User’s and Service Guide
Front View
Rear View
DSub connector
Power indicator
USB indicator
55-pin backplane connector
USB inlet
Power inlet
Fastening hole for USB cable with locking mechanism