Agilent Technologies U2781A User Manual

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Agilent U2781A USB Modular Instrument Chassis

User’s Guide

Agilent Technologies

Notices

CAUTION

WARNING

No p art o f this manu al may be re produce d 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 Agilent Technologies, Inc. as governed by United States and international copyright laws.

Manual Part Number

U2781-90003

Edition

Fifth Edition, November 8, 2011

Printed in Malaysia

Agilent Technologies, Inc. Bayan Lepas Free Industrial Zone, 11900 Penang, Malaysia

Trademark Acknowledgements

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.

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, Agilent 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. Agilent 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 Agilent 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.

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.

Restricted Rights Legend

U.S. Government Restricted Rights. Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers. Agilent provides this customary commercial license in Software and technical data pursuant to FAR 12.211 (Technical Data) and 12.212 (Computer Software) and, for the Department of Defense, DFARS

252.227-7015 (Technical Data - Commercial Items) and DFARS 227.7202-3 (Rights in Commercial Computer Software or Computer Software Documentation).

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. If the equipment is used in a manner not specified by the manufaturer, the protection provided by the equipment may be impaired.

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.

II U2781A User’s Guide

Safety Information

The following general safety precautions must be observed during all phases of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies, Inc. assumes no liability for the customer’s failure to comply with these requirements.

Safety Symbols

The following symbols indicate that precautions must be taken to maintain safe operation of the instrument.

Direct current

Warning

Regulatory Markings

The CE mark shows that the product complies with all the relevant European Legal Directives (if accompanied by a year, it signifies when the design was proven).

The CSA mark is a registered trademark of the Canadian Standards Association. A CSA mark with the indicators "C" and "US" means that the product is certified for both the U.S. and Canadian markets, to the applicable American and Canadian standards.

The C-tick mark is a registered trademark of the Spectrum Management Agency of Australia. This signifies compliance with the Australian EMC Framework regulations under the terms of the Radio Communications Act of 1992.

ICES/NMB-001

This ISM device complies with the Canadian ICES-001.

U2781A User’s Guide III

General Safety Information

WARNING

CAUTION

• Do not use the device if it is damaged. Before you use the device, inspect the case. Look for cracks or missing plastic. Do not operate the device around explosive gas, vapor or dust.

• Do not apply more than the rated voltage (as marked on the device) between terminals, or between terminal and external ground.

• Always use the device with the cables provided.

• Observe all markings on the device before connecting to the device.

• Turn off the device and application system power before connecting to the I/O terminals.

• When servicing the device, use only specified replacement parts.

• Do not operate the device with the removable cover removed or loosened.

• Do not connect any cables and terminal block prior to performing self-test process.

• Do not load the output terminals above the specified current limits. Applying excessive voltage or overloading the device will cause irreversible damage to the circuitry.

• Applying excessive voltage or overloading the input terminal will damage the device permanently.

• If the device is used in a manner not specified by the manufacturer, the protection provided by the device may be impaired.

• Always use dry cloth to clean the device. Do not use ethyl alcohol or any other volatile liquid to clean the device.

• Do not permit any blockage of the ventilation holes of the device.

IV U2781A User’s Guide

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/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 shown as below:

Do not dispose in domestic household waste

To return this unwanted instrument, contact your nearest Agilent office, or visit:

http://www.agilent.com/environment/product

for more information.

U2781A User’s Guide V

In This Guide…

1Getting Started provides an overview of the U2781A USB modular instrument

chassis, the product outlook and dimension. This chapter also contains instructions on how to get started with the U2781A USB modular chassis.

2 Features and Functions provides information for better understanding of the

features and functions of the U2781A USB modular instrument chassis.

3 Characteristics and Specifications specifies the characteristics, environment

conditions, and specifications of the U2781A USB modular instrument chassis.

VI U2781A User’s Guide

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Generic example

Manufacturer’s Name:

Agilent Technologies Microwave Products (M) Sdn. Bhd

Manufacturer’s Address:

Bayan Lepas Free Industrial Zone, 11900, Bayan Lepas, Penang, Malaysia

Declares under sole responsibility that the product as originally delivered

Product Name:

USB Modular Instrument Chassis (USB Card cage)

Models Number:

U2781A

Product Options:

This declaration covers all options of the above product(s)

complies with the essential requirements of the following applicable European Directives, and carries the CE marking accordingly:

Low Voltage Directive (73/23/EEC, amended by 93/68/EEC) EMC Directive (89/336/EEC, amended by 93/68/EEC)

and conforms with the following product standards:

EMC

Standard

StandardStandard

Standard Limit

LimitLimit

Limit

IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998 CISPR 11:1990 / EN55011:1991 Class A Group 1 IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995 4 kV CD, 8 kV AD

IEC 61000-4-3:1995 / EN 61000-4-3:1995 3 V/m, 80-1000 MHz IEC 61000-4-4:1995 / EN 61000-4-4:1995 0.5 kV signal lines, 1 kV power lines IEC 61000-4-5:1995 / EN 61000-4-5:1995 0.5 kV line-line, 1 kV line-ground IEC 61000-4-6:1996 / EN 61000-4-6:1996 3 V, 0.15-80 MHz IEC 61000-4-11:1994 / EN 61000-4-11:1994 1 cycle / 100%

Canada: ICES-001:1998 Australia/New Zealand: AS/NZS 2064.1

The product was tested in a typical configuration with Agilent Technologies test systems.

Safety

IEC 61010-1:2001 / EN 61010-1:2001 Canada: CSA C22.2 No. 61010-1:2004 USA: UL 61010-1: 2004

Supplementary Information:

U2781A is USB Modular Instrument chassis with 6 USB modules slot.

This DoC applies to above-listed products placed on the EU market after:

19-Dec-2006

Date

Mack Soh

Quality Manager

For further information, please contact your local Agilent Technologies sales office, agent or distributor, or Agilent Technologies Deutschland GmbH, Herrenberger Straße 130, D 71034 Böblingen, Germany.

Template: A5971-5302-2, Rev. B.01 U2781A Rev 1.0

U2781A User’s Guide VII

Product Regulations

Performance Criteria

IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998

CISPR 11:1990 / EN 55011:1991

– Group 1 Class A

IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995

(ESD 4kV CD, 8kV AD)

IEC 61000-4-3:1995 / EN 61000-4-3:1995

(3V/m, 80% AM)

IEC 61000-4-4:1995 / EN 61000-4-4:1995

(EFT 0.5kV line-line, 1kV line-earth)

IEC 61000-4-5:1995 / EN 61000-4-5:1995

(Surge 0.5kV line-line, 1kV line-earth)

IEC 61000-4-6:1996 / EN 61000-4-6:1996

(3V, 0.15~80 MHz, 80% AM, power line)

IEC 61000-4-11:1994 / EN 61000-4-11:1994

(Dips 1 cycle, 100%)

Canada: ICES-001:1998 Australia/New Zealand: AS/NZS 2064.1

EMC

IEC 61010-1:2001 / EN 61010-1:2001 Canada: CSA C22.2 No. 61010-1:2004

Safety

USA: UL 61010-1: 2004

Additional Information:

The product herewith complies with the essential requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly (European Union).

Performance Criteria:

A Pass - Normal operation, no effect. B Pass - Temporary degradation, self recoverable. C Pass - Temporary degradation, operator intervention required. D Fail - Not recoverable, component damage. N/A – Not applicable

Notes:

Regulatory Information for Canada

ICES/NMB-001:1998 This ISM device complies with Canadian ICES-001. Cet appareil ISM est confomre à la norme NMB-001 du Canada.

Regulatory Information for Australia/New Zealand

This ISM device complies with Australian/New Zealand AS/NZS 2064.1

VIII U2781A User’s Guide

Contents

1 Getting Started

Introduction 2 Product Overview 3

Product Outlook 3

Dimensions 4 Standard Purchase Items Checklist 5 Installations and Configurations 6 General Maintenance 7

2 Features and Functions

Introduction 10 USB Backplane 11 Trig ge r Bu s (T R IG [0. .7] ) 13 External Trigger Out 14 External Trigger In (Star Trigger) 15 Simultaneous Synchronization (SSI) 16

Single Master–multiple Slaves 18

Multiple Master–multiple Slaves 21 System Reference Clock 23 Chassis Temperature Monitoring 24 Fan Speed Monitoring 25 Identifying Modules Location 26

Geographical Address 26

Modules Identification 26

3 Characteristics and Specifications

Product Characteristics 30 Electrical Specifications 32 Mechanical Specifications 33

U2781A User’s Guide IX

Contents

List of Figures

Figure 2-1 USB backplane block diagram 12 Figure 2-2 Block diagram of Trigger Bus (TRIG [0..7]) and Trigger Out 13 Figure 2-3 Block diagram of the 10 Mhz Reference Clock and External Trigger

In 15

Figure 2-4 Synchronization between modules in the chassis 17 Figure 2-5 Single Master–multiple Slave triggering with DAQ 18 Figure 2-6 Single Master–multiple Slave triggering 19

X U2781A User’s Guide

Figure 2-7 Multiple Master–multiple Slave triggering 21 Figure 2-8 Block diagram of temperature monitoring and fan control 24 Figure 2-9 Identifying modules location 27

Contents

U2781A User’s Guide XI

Contents

List of Tables

Ta b l e 2 - 1 Pin information of SSI connector 11 Ta b l e 2 - 2 Trigger out bits for U2300A, U2500A, and U2600A Series DAQ

devices 14

Ta b l e 2 - 3 Example of configurations for single Master-multiple Slaves using

DAQ and U2700A Series modular products. 20

Ta b l e 2 - 4 Example of configurations for multiple Master–multiple Slaves 22

XII U2781A User’s Guide

Agilent U2781A USB Modular Instrument Chassis User’s Guide

1 Getting Started

Introduction 2 Product Overview 3

Product Outlook 3

Dimensions 4 Standard Purchase Items Checklist 5 Installations and Configurations 6 General Maintenance 7

This chapter provides an overview of the U2781A USB modular instrument chassis, the product outlook and dimension. This chapter also contains instructions on how to get started with the chassis from the installation of modules to the chassis to the installations of hardware and software to the start-up and configurations of Agilent Measurement Manager application software.

Agilent Technologies

1Getting Started

Introduction

The U2781A USB modular instrument chassis is a 4U height chassis with six USB module slots. It is a portable chassis with high performance added value. It targets a wide range of applications in both industrial and scientific environments. It helps to lower cost of test and accelerate your test system integration

and development.

The Agilent U2781A is equipped with USB plug- and- play connectivity. The USB interface that is compliant with the

TMC- 488.2 Standards work seamlessly with Agilent Measurement Manager software and can be controlled remotely via industry standard SCPI commands. In addition, the U2781A modular instrument chassis comes with Agilent IO Libraries Suite 14.2.

The U2781A modular instrument chassis comes with star trigger bus, which offers precise synchronization between USB modules and the external trigger signal. The star trigger bus is a dedicated

trigger lines between the external trigger input and USB slots.

The Agilent U2781A USB modular instrument chassis can be applied to nearly any industrial data acquisition, industrial automation and education environment. The primary advantage is its synchronization capability between modules.

2 U2781A User’s Guide

Product Overview

Module L-Mount Kit

ON/OFF

switch

Bumper

Trigger In

USB Port

Trigger Out

Ext 10 MHz

AC Input

Product Outlook

Getting Started 1

Front View

U2781A User’s Guide 3

Rear View

1Getting Started

270.00 mm

271.20 mm

197.00 mm

Dimensions

4 U2781A User’s Guide

Standard Purchase Items Checklist

Inspect and verify the following items for the standard purchase of U2781A USB modular instrument chassis. If there are missing items, contact the nearest Agilent Sales Office.

✔ Power cord

✔ USB Extension Cable

✔ Agilent USB Modular Products and Systems Quick Start Guide

✔ Agilent USB Modular Products and Systems Product Reference

DVD- ROM

✔ Agilent Automation- Ready CD- ROM (contains the Agilent IO

Libraries Suite)

✔ Functional Test Certificate

Getting Started 1

U2781A User’s Guide 5

1Getting Started

NOTE

Installations and Configurations

If you are using the U2781A USB modular instrument chassis with the Agilent Measurement Manager, follow the step- by- step instructions as shown in the Agilent USB Modular Products and Systems Quick Start Guide.

You need to install IVI-COM driver before using the U2781A Series with Agilent VEE, LabVIEW or Microsoft Visual Studio.

6 U2781A User’s Guide

General Maintenance

NOTE

Repair or service which are not covered in this manual should only be performed by qualified personnel.

To remove the dirt or moisture in the chassis panel, the cleaning steps are as follows:

1 Power off the chassis device and remove the power cord and I/O

cable from the chassis.

2 Shake out any dirt that may have accumulated inside the

chassis device.

3 Wipe the chassis with a dry cloth.

Getting Started 1

U2781A User’s Guide 7

1Getting Started

8 U2781A User’s Guide

Agilent U2781A USB Modular Instrument Chassis User’s Guide

2 Features and Functions

Introduction 10 USB Backplane 11 Trigger Bus (TRIG [0..7]) 13 External Trigger Out 14 External Trigger In (Star Trigger) 15 Simultaneous Synchronization (SSI) 16

Single Master–multiple Slaves 18

Multiple Master–multiple Slaves 21 Simultaneous Synchronization (SSI) 16 Chassis Temperature Monitoring 24 Fan Speed Monitoring 25 Identifying Modules Location 26

Geographical Address 26

Modules Identification 26

This chapter provides information for better understanding of the features and functions of the U2781A USB modular instrument chassis.

Agilent Technologies

2 Features and Functions

Introduction

The Agilent U2781A USB modular instrument chassis provides six USB modular slots and is equipped with 200 W universal AC power supply and built- in over current protection circuit. A 10 MHz system reference clock is supplied to each modules slots. There are two temperature sensors and a monitoring fan control circuit to monitor the internal temperature and speed of the fan. The fan is mainly used for heat dissipation.

The chassis also provides external 10 MHz reference clock, external trigger in and trigger out functions via BNC connectors at the rear panel.

The key function for the chassis is to provide users with flexibility when using the U2781A modular instrument chassis. The modular chassis allocates housing for six USB modules with built- in power supply. The USB backplane provides a means to synchronize the modules.

The key features of the U2781A USB modular instrument chassis are as follows:

• Simultaneous Synchronization (SSI)

• Star trigger

• Internal and external 10 MHz reference clock

• Trigger in and trigger out signals

• Standard SCPI commands

• IVI- COM driver compatibility

• USBTMC 488.2 compliant

• Hi- Speed USB 2.0 interface

The key functions of the Agilent U2781A USB modular instrument chassis will be elaborated in the following sections.

10 U2781A User’s Guide

USB Backplane

Features and Functions 2

55-Pin Backplane Connector Pins Configuration

11 GND +12V +12V GND USB_D+ USB_D- GND

10 GND +12V +12V +12V GND GND GND

9 GND +12V +12V +12V GND USB_VBUS GND

8 GND LBL0 BRSV GND TRIG0 LBR0 GND

7 GND LBL1 GA0 TRIG7 GND LBR1 GND

6 GND LBL2 GA1 GND TRIG1 LBR2 GND

5 GND LBL3 GA2 TRIG6 GND LBR3 GND

4 GND LBL4 STAR TRIG GND TRIG2 LBR4 GND

3 GND LBL5 GND TRIG5 GND LBR5 GND

2 GND LBL6 CLK10M GND TRIG3 LBR6 GND

1 GND LBL7 GND TRIG4 GND LBR7 GND

ZA B C D E F

Tab l e 2 - 1 Pin information of SSI connector

SSI timing signal Functionality

+12V +12 V power from backplane

GND Ground

BRSV Reserved pin

TRIG0~TRIG7 Trigger bus 0 ~ 7

STAR_TRIG Star trigger

CLK10M 10MHz reference clock

USB_VBUS USB bus power, +5 V

USB_D+, USB_D– USB differential pair

LBL <0..7> and LBR <0..7> Reserved pin

GA0, GA1, GA2 Geographical address pin

U2781A User’s Guide 11

2 Features and Functions

Figure 2-1 USB backplane block diagram

12 U2781A User’s Guide

Trigger Bus (TRIG [0..7])

TRIG [0..7]

Trigger Bus (TRIG [0..7]) is an 8- bit digital bus connected from slot 1 to slot 6 to synchronize different USB modules. This trigger bus enables the USB modules of passing trigger signals to one another.

To have one of the modules to control the operation of the other modules, set the particular module as MASTER and the rest as SLAVE (refer to Simultaneous Synchronization (SSI) for more details). The control signal is sent from the MASTER module to the SLAVE modules through this trigger bus. See following figure for the bus architecture.

Features and Functions 2

Figure 2-2 Block diagram of Trigger Bus (TRIG [0..7]) and Trigger Out

In addition, the trigger bus can also be used to carry out the pre- configuration of the chassis and modules before any triggering activities. Refer to Identifying Modules Location for more information.

U2781A User’s Guide 13

2 Features and Functions

External Trigger Out

Trigger Out selects one of the eight lines from trigger bus (TRIG [0..7]) as an external trigger source. The selection of the trigger out line is done by the USB device in the chassis as illustrated in Figure 2- 2 by means of a multiplexer.

Table 2- 2 defines the available trigger out signals provided

by U2300A, U2500A, and U2600A Series DAQ, whereas for U2700A Series modular products, user is allowed to choose any trigger line from the trigger bus (TRIG [0..7]) as an external trigger source.

The SCPI command below is used to select one of the lines or bits of the trigger bus (TRIG [0..7]) as an external trigger source:

TRIGger:OUT {0|1|2|3|4|5|6|7}

Tab l e 2 - 2 Trigger out bits for U2300A, U2500A, and U2600A Series DAQ

devices

Trigger Out Function

Bit-0 Time base Bit-1 Reserved Bit-2 Reserved Bit-3 A/D trigger Bit-4 Reserved Bit-5 Reserved Bit-6 Reserved Bit-7 D/A trigger

14 U2781A User’s Guide

External Trigger In (Star Trigger)

Star Trigger Bus

The star trigger bus offers a very high performance or precise synchronization between modules. The star trigger bus is a dedicated trigger line between the External Trigger Input and USB slots. This trigger signal is sent from external to each slot through a 1- to- 6 CLK buffer. The slot-to- slot skews are minimized to ensure that trigger signal reaches all six slots simultaneously. Refer to the following figure for the star trigger bus architecture illustration.

To set star trigger as the module trigger source, the following SCPI command is sent to the modules:

OUTP:TRIG:SOUR STRG

Features and Functions 2

Figure 2-3 Block diagram of the 10 Mhz Reference Clock and External

Trigger In

U2781A User’s Guide 15

2 Features and Functions

NOTE

Simultaneous Synchronization (SSI)

Simultaneous Synchronization (SSI) provides synchronization between the modular products within the chassis. Figure 2- 4 illustrates an example of SSI. The SSI feature should be configured using the bundled Agilent Measurement Manager (AMM).

SSI allows users to set the modules as MASTER or SLAVE. The MASTER module sends the SSI signal to the slave modules via the backplane trigger bus (TRIG [0..7]). SLAVE modules will then receive the signal and begin synchronization with MASTER module.

There are two SSI configuration modes available — single Master–multiple Slaves and multiple Masters–multiple Slaves.

• Only ONE master can be assigned for U2300A, U2500A, and U2600A Series.

• For more information, refer to the AMM Help File, Chassis Trigger page.

16 U2781A User’s Guide

Features and Functions 2

MASTER Module

FPGA

55-pin

Connectors

USB

Interface

To PC wi t h A MM

SLAVE module 1

SLAVE module 2

FPGA

SSI Signals

SSI Trigger Bus

Chassis

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

55-pin

Connectors

SLAVE module 1

SLAVE module 2

FPGA

SSI Signals

55-pin

Connectors

MASTER Module

FPGA

SSI Signals

Figure 2-4 Synchronization between modules in the chassis

U2781A User’s Guide 17

2 Features and Functions

NOTE

Single Master–multiple Slaves

In this configuration, only one Master module is allowed to send the SSI trigger event to the receiving Slave modules.

Configuration with Agilent U2300A, U2500A, and U2600A Series DAQ only

When there is one or more U2300A, U2500A, or U2600A Series DAQ in the SSI configuration, SSI allows users to set only one of the modules as MASTER and others as SLAVE through AMM. Alternatively, users can also set this configuration using the SCPI commands.

Refer to U2300A, U2500A, and U2600A Series DAQ Programmer's Reference.

Figure 2-5 Single Master–multiple Slave triggering with DAQ

18 U2781A User’s Guide

Features and Functions 2

Configuration with combination of Agilent U2300A, U2500A, U2600A Series DAQ and U2700A Series modular products

With one DAQ configured as Master, all of the other U2700A Series modular devices can only be configured as Slave to receive the event of the signal as shown in Table 2- 2.

Figure 2-6 Single Master–multiple Slave triggering

Table 2- 3 shows some examples of supported and not

supported configurations.

U2781A User’s Guide 19

2 Features and Functions

Tab l e 2 - 3 Example of configurations for single Master-multiple Slaves using DAQ and U2700A Series modular

products.

Slot 1 Slot 2 Slot 3 Slot 4 & Slot 5 Slot 6

DAQ U2701A/U2702A U2761A U2722A DAQ

Supported configurations

Configuration 1 M = T0 – T7 S = T0 S = T3 S = T7 S = T0 – T7 Configuration 2 None M = T1 S = T1 S = T1 None Configuration 3 M = T0 – T7 None None None S = T0 – T7

Not supported configurations

Configuration 1 Configuration 2 Configuration 3 Configuration 4

[1]

[2]

M = T0 – T7 M = T1 S = T1 S = T2 None

S = T0 – T7 M = T1 S = T1 S = T2 None S = T0 – T7 M = T1 S = T1 S = T1 None S = T0 – T7 M = T0 – T7 S = T0 S = T0 None

M — Master, S — Slave, T0~T7 — Trigger bus (TRIG [0..7]), * — Star Trigger

[1]

Multiple Master is not allowed with DAQ set as Master.

[2]

U2700A Series modular devices should not be configured as Master.

20 U2781A User’s Guide

Multiple Master–multiple Slaves

In this configuration, groups of single Master- multiple Slaves are allowed in order to perform multiple synchronizations simultaneously. This configuration is only supported by U2700A Series modular products.

Features and Functions 2

Figure 2-7 Multiple Master–multiple Slave triggering

Table 2- 4 shows some examples of supported and not

supported configurations. Example of configurations for multiple Master–multiple Slaves.

U2781A User’s Guide 21

2 Features and Functions

Tab l e 2 - 4 Example of configurations for multiple Master–multiple Slaves

Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 & Slot 6

U2701A U2702A U2761A U2751A U2722A

Supported configurations

Configuration 1 M = T0 S = T0 S = T0 None S = T0 Configuration 2 S = T1 M = T1 None None S = T1 Configuration 3 M = T0 M = T1 S = T0 None S = T1 Configuration 4 *(Out)

M = T1

Configuration 5 *(Out) * (In) * (In) None * (In)

Not supported configurations

Configuration 1 Configuration 2

Configuration 3

[1]

[2]

[3]

M = T0 M = T0 S = T0 None S = T0 M = T3 S = T3

M = T0

S = T1

Configuration 4

[4]

*(Out)

M = T1

S = T1 * (In) None S = T1

M = T4 None S = T4

S = T4 S = T0 S = T0 None S = T1

* (In)

None None None

S = T1

M — Master, S — Slave, T0~T7 — Trigger bus (TRIG [0..7]), * — Star Trigger

[1]

Same trigger line is not allowed for multiple Master configuration.

[2]

Slave device not allowed to occupy two trigger lines.

[3]

Not allowed to have both Master and Slave configuration for a device.

[4]

Not allowed to have Star Trigger and Slave mode for a device.

22 U2781A User’s Guide

System Reference Clock

The 10 MHz reference clock can come from two sources; internal backplane oscillator and external clock source.

The internal oscillator on the USB backplane supplies an independent 10 MHz system reference clock to each of the USB slot. This 10 MHz reference clock is driven through an independent buffer. Refer to Figure 2- 3 for the block diagram. Every clock trace is in equal distance to ensure that the distance of the slot to the slot skew is minimized. Users can use this common reference clock signal to synchronize multiple modules in a measurement or control system.

The default SCPI command of ACQuire:RSIGnal AUTO will scan through and detect if there is any valid clock source from the external BNC connector. If none is found, then the internal 10 MHz clock source will be used.

The SCPI command below will direct the reference clock source to the internal 10 MHz:

Features and Functions 2

ACQuire:RSIGnal INT

U2781A User’s Guide 23

2 Features and Functions

Chassis Temperature Monitoring

The chassis contains a temperature control circuitry. It has two thermistor sensors to sense the inner temperature of the chassis. The temperature control circuitry communicates with backplane USB device through an I illustrated in following figure.

C interface as

Figure 2-8 Block diagram of temperature monitoring and fan control

The SCPI command below queries the temperature reading from the sensors in degree Celsius (°C):

SYSTem:TEMPerature? {1|2}

24 U2781A User’s Guide

Fan Speed Monitoring

Features and Functions 2

The U2781A USB modular instrument chassis is also integrated with a fan speed control circuit. It is used to monitor the fan status and speed. The control circuit communicates with backplane USB device via I Refer to Figure 2-8.

To query the fan status, send the SCPI command below:

SYSTem:FSTATus? {1|2}

To query the fan speed in revolutions per minute (rpm), send the SCPI command below:

SYSTem:FSPeed? {1|2}

C interface.

U2781A User’s Guide 25

2 Features and Functions

Identifying Modules Location

Geographical Address

Each slot in the chassis is designed with a 3- bit address pin, which is designated as a location identity for USB modules. The address for all six slots are as below:

Slot Address

1001 2010 3011 4100 5101 6110

The USB modules are able to read this 3- bit data and know which slot the module is plugged in. To read the geographical address of each module, the SCPI command below is used:

SYSTem:CDEScription?

Modules Identification

You may have more than one module or chassis connected to the same host PC. The following figure illustrates an example of the connection.

26 U2781A User’s Guide

Features and Functions 2

NOTE

Figure 2-9 Identifying modules location

To identify the location of the modules, a pre- configuration setting is needed before the synchronization or triggering event begins. Follow the steps below:

1 Send the following command to the modular chassis to

trigger it. This command will be used to transmit the number to all USB modules via Trigger Bus (TRIG [0..7]). You can choose from 0 to 255 for your chassis number.

SYSTem:IDentity {0|1|2|3…|255}

Select 0 to disable the output. The modular chassis will not be triggered to send any output to the USB modules.

2 Send the following command to every module in the

chassis to query each of the slot and chassis numbers.

SYST:CDES?

3 You may need to perform some sorting routine to

determine which slot it is at and what is the assigned number of its host chassis. If a chassis has six modules in

U2781A User’s Guide 27

2 Features and Functions

NOTE

it, then there will be a total of seven SCPI commands to send to chassis and modules.

4 During this identification operation, the trigger bus is

used. Hence, any triggering activities on the backplane would be blocked.

5 Prior to any triggering activities, you must stop the

configuration activity by sending the following command:

SYSTem:IDentity {0|OFF}

• Do not execute the above mentioned steps when the USB modules are in the process of acquiring data.

• You do not need to perform the above pre-configuration if you are using the Agilent Measurement Manager software. You are only required to press the “Refresh” button.

28 U2781A User’s Guide

Agilent U2781A USB Modular Instrument Chassis User’s Guide

3 Characteristics and Specifications

Product Characteristics 30 Electrical Specifications 32 Mechanical Specifications 33

This chapter specifies the characteristics, environment conditions, and specifications of the U2781A USB modular instrument chassis.

Agilent Technologies

3 Characteristics and Specifications

Product Characteristics

REMOTE INTERFACE

• Hi-Speed USB 2.0

• USBTMC Class Device

POWER CONSUMPTION

• 400 VA maximum

• Installation Category II

OPERATING ENVIRONMENT

• Operating temperature from 0 °C to +55 °C

• Relative humidity at 15% to 85% RH (non-condensing)

• Altitude up to 2000 meters

• Pollution Degree 2

• For indoor use only

STORAGE COMPLIANCE

–20 °C to 70 °C

SAFETY COMPLIANCE

Certified with:

• IEC 61010-1:2001/EN 61010-1:2001 (2nd Edition)

• USA: UL61010-1: 2004

• Canada: CSA C22.2 No.61010-1:2004

EMC COMPLIANCE

• IEC/EN 61326-1 1998

• CISPR 11: 1990/EN55011:1991, Class A, Group 1

• CANADA: ICES-001: 1998

• Australia/New Zealand: AS/NZS 2064.1

ACOUSTIC EMISSION

• Sound pressure level: 45.5 dB(A)

• Sound power level: 56.6 dB(A)

SHOCK & VIBRATION

Tested to IEC/EN 60068-2

DIMENSION (WxDxH)

270.00 mm x 271.20 mm x 197.00 mm

30 U2781A User’s Guide

Characteristics and Specifications 3

WEIGHT

3.7 kg (without any modules slotted in)

WARRANTY

Please refer to http://www.agilent.com/go/warranty_terms

• Three years for the product

• Three months for the product's standard accessories, unless otherwise specified

Please take note that for the product, the warranty does not cover:

• Damage from contamination

• Normal wear and tear of mechanical components

• Manuals

1 Compatible with Microsoft Windows operating systems only.

U2781A User’s Guide 31

3 Characteristics and Specifications

Electrical Specifications

Power Supply AC Input

Input voltage range 100 to 240 VAC Input frequency range 50 to 60 Hz Power consumption 400 VA maximum Efficiency 75%

Power Supply DC Output

Output rated voltage 12 VDC Max output rated current 16.7 A Max output rated power 200 W Over voltage protection 13.2 to 16.2 V

Internal 10 MHz Reference Clock

Accuracy 25 ppm for operating range Slot to slot skew 350 ps

External 10 MHz Reference Clock

Auto detection level Yes Input frequency range 10 MHz Input magnitude 100 mVpp to 5 Vpp (sine/square wave) Input impedance 50 Ω ± 5 Ω Damage level 10 Vrms

External Trigger In

Compatibility TTL V

(Positive threshold voltage) 2.0 V

(Negative threshold voltage) 0.8 V

Hold time 8 ns pulse width Input voltage range 0 to 5.0 V Slot to slot skew 350 ps

External Trigger Out

Output voltage range 0 to 3.3 V

2.9 V

0.1 V

32 U2781A User’s Guide

Mechanical Specifications

Physical Layout

Number of USB module slots 6 Dimension of each module slot 25.40 mm (W) x 174.54 mm (D) x 105.00 mm (H) Dimension of chassis 270.00 mm (W) x 271.20 mm (D) x 197.00 mm (H) Weight 3.7 kg Power LED ON/OFF type USB Backplane Connector 55 pins Ernet male type C Input signals External 10 MHz clock in (BNC connector)

Output signal Trigger out (BNC connector)

Cooling Fan

Number of fans 2 Fan speed 3300 rpm ±10% Noise 37 dB(A) Power (each fan) 2.52 W

Characteristics and Specifications 3

External trigger in (BNC connector)

U2781A User’s Guide 33

3 Characteristics and Specifications

34 U2781A User’s Guide

www.agilent.com

o obtain service, warranty or technical

support assistance, contact us at the following phone numbers:

United States: (tel) 800 829 4444 (fax) 800 829 4433 Canada: (tel) 877 894 4414 (fax) 800 746 4866 China: (tel) 800 810 0189 (fax) 800 820 2816 Europe: (tel) 31 20 547 2111 Japan: (tel) (81) 426 56 7832 (fax) (81) 426 56 7840 Korea: (tel) (080) 769 0800 (fax) (080) 769 0900 Latin America: (tel) (305) 269 7500 Ta i w a n : (tel) 0800 047 866 (fax) 0800 286 331 Other Asia Pacific Countries: (tel) (65) 6375 8100 (fax) (65) 6755 0042

Or visit Agilent world wide web at: www.agilent.com/find/assist

Product specifications and descriptions in this document subject to change without notice.

Printed in Malaysia Fifth Edition, November 8, 2011

U2781-90003

Agilent Technologies

Agilent Technologies U2781A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

In This Guide…

Contents

List of Figures

List of Tables

1 Getting Started

Introduction

Product Overview

Product Outlook

Dimensions

Standard Purchase Items Checklist

Installations and Configurations

General Maintenance

2 Features and Functions

Introduction

USB Backplane

Trigger Bus (TRIG [0..7])

External Trigger Out

External Trigger In (Star Trigger)

Simultaneous Synchronization (SSI)

Single Master–multiple Slaves

Multiple Master–multiple Slaves

System Reference Clock

Chassis Temperature Monitoring

Fan Speed Monitoring

Identifying Modules Location

Geographical Address

Modules Identification

3 Characteristics and Specifications

Product Characteristics

Electrical Specifications

Mechanical Specifications