Agilent Technologies N4962A Manual de usuario

Agilent N4962A

Serial BERT 12.5 Gb/s

User Guide

Notices

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 Agilent Technologies, Inc. as

governed by United States and international

Manual Part Number

N4962-91021

Edition

Third edition, May 2013

Agilent Technologies, Deutschland GmbH

Herrenberger Str. 130

71034 Böblingen, Germany

For Assistance and Support

http://www.agilent.com/find/assist

Limitation of Warranty

The foregoing warranty shall not apply to defects

resulting from improper or inadequate

maintenance by Buyer, Buyer-supplied software or

interfacing, unauthorized modification or misuse,

operation outside of the environmental

specifications for the product, or improper site

preparation or maintenance. No other warranty is

expressed or implied. Agilent Technologies

specifically disclaims the implied warranties of

Merchantability and Fitness for a Particular

Purpose.

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

If software is for use in the performance of a U.S.

Government prime contract or subcontract,

Software is delivered and licensed as

“Commercial computer software” as defined in

DFAR 252.227-7014 (June 1995), or as a

“commercial item” as defined in FAR 2.101(a) or

as “Restricted computer software” as defined in

FAR 52.227-19 (June 1987) or any equivalent

agency regulation or contract clause. Use,

duplication or disclosure of Software is subject to

Agilent Technologies’ standard commercial

license terms, and non-DOD Departments and

Agencies of the U.S. Government will receive no

greater than Restricted Rights as defined in FAR

52.227-19(c)(1-2) (June 1987). U.S. Government

users will receive no greater than Limited Rights

as defined in FAR 52.227-14 (June 1987) or DFAR

252.227-7015 (b)(2) (November 1995), as

applicable in any technical data.

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.

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.

A NOTE provides important or special

information.

CAUTION

WARNING

NOTE

Safety Summary

General Safety Precautions

The following general safety precautions

must be observed during all phases of

operation 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.

Before operation, review the instrument and

manual for safety markings and instructions.

You must follow these to ensure safe

operation and to maintain the instrument in

safe condition.

Initial Inspection

Inspect the shipping container for damage. If

there is damage to the container or

cushioning, keep them until you have

checked the contents of the shipment for

completeness and verified the instrument

both mechanically and electrically. The

Performance Tests give procedures for

checking the operation of the instrument. If

the contents are incomplete, mechanical

damage or defect is apparent, or if an

instrument does not pass the operator’s

checks, notify the nearest Agilent

Technologies Sales/Service Office.

WARNING To avoid hazardous electrical

shock, do not perform electrical tests when

there are signs of shipping damage to any

portion of the outer enclosure (covers,

panels, etc.).

General

This product is a Safety Class 1 product

(provided with a protective earthing ground

incorporated in the power cord). The mains

plug shall only be inserted in a socket outlet

provided with a protective earth contact.

Any interruption of the protective conductor,

inside or outside of the instrument, will

make the instrument dangerous. Intentional

interruption is prohibited.

Environment Conditions

This instrument is intended for indoor use in

an installation category II, pollution degree 2

environment per IEC 61010 Second Edition

and 664 respectively. It is designed to

operate within a temperature range of 10 to

40 °C at a maximum relative humidity of 80%

for temperatures up to 31 °C, decreasing

linearly to 50% relative humidity at 40 °C at

an altitude of 2000 meters.

This module can be stored or shipped at

temperatures between -40°C and +70°C.

Protect the module from temperature

extremes that may cause condensation

within it.

Before Applying Power

Verify that all safety precautions are taken.

The power cable inlet of the instrument

serves as a device to disconnect from the

mains in case of hazard. The instrument

must be positioned so that the operator can

easily access the power cable inlet. When

the instrument is rack mounted the rack

must be provided with an easily accessible

mains switch.

Ground the Instrument

Install the instrument so that the ON / OFF

switch is readily identifiable and is easily

reached by the operator. The ON / OFF

switch is the instrument disconnecting

device. It disconnects the mains circuits

from the mains supply before other parts of

the instrument. Or the detachable power

cord can be removed from the electrical

supply. Alternately, an externally installed

switch or circuit breaker which is readily

identifiable and is easily reached by the

operator may be used as a disconnecting

device.

Do Not Operate in an Explosive

Atmosphere

Do not operate the instrument in the

presence of flammable gases or fumes.

Do Not Remove the Instrument

Cover

Operating personnel must not remove

instrument covers. Component replacement

and internal adjustments must be made only

by qualified personnel.

Instruments that appear damaged or

defective should be made inoperative and

secured against unintended operation until

they can be repaired by qualified service

personnel.

Symbols on Instruments

Indicates warning or caution. If you see this

symbol on a product, you must refer to the

manuals for specific Warning or Caution

information to avoid personal injury or damage to

the product.

C-Tick Conformity Mark of the Australian ACA for

EMC compliance.

Indicates that protective earthing ground is

incorporated in the power cord.

This symbol indicates that internal circuits can be

damaged by electrostatic discharge (ESD),

therefore, avoid applying static discharges to the

panel input connectors.

This mark indicates compliance with the Canadian

EMC regulations.

ISM 1-A

This text denotes the instrument is an Industrial

Scientific and Medical Group 1 Class A product.

CE Marking to state compliance within the

European Community: This product is in

conformity with the relevant European Directives:

EMC Directive 2004/108/EC and Low Voltage

Directive 2006/95/EC.

China RoHS regulations include requirements

related to packaging, and require compliance to

China standard GB18455-2001. This symbol

indicates compliance with the China RoHS

regulations for paper/fiberboard packaging.

Indicates the time period during which no

hazardous or toxic substance elements are

expected to leak or deteriorate during normal use.

Forty years is the expected useful life of the

product.

The Korean Certification (KC) mark is required for

products that are subject to legally compulsory

certification.

The KC mark includes the marking’s identifier

code that has up to 26 digits and follows this

format: KCC-VWX-YYY-ZZZZZZZZZZZZZ.

This symbol indicates that the instrument requires

alternating current (AC) input.

This symbol indicates that the power line switch

is in the ON position.

This symbol indicates that the power line switch

is in the OFF position.

Environmental Information

This product complies with the WEEE Directive

(2002/96/EC) marketing requirements. The affixed

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 Annexure I, this product

is classed as a “Monitoring and Control

instrumentation” product.

Do not dispose in domestic household waste.

To return unwanted products, contact your local

Agilent office, or see

www.agilent.com/environment/product/ for more

information.

Contents

Serial BERT 12.5 Gb/s User Guide 7

Contents

1Getting Started ......................................................................................................... 9

1.1 General.............................................................................................................. 9

1.2 N4962A Operation Overview ....................................................................... 11

1.3 Getting Started with the N4962A Serial BERT 12.5 Gb/s...................... 12

1.3.1 Unpacking and Installation........................................................... 12

1.3.2 Safety and Regulatory.................................................................... 12

1.3.3 Declaration of Conformity............................................................. 13

1.3.4 Important Notes.............................................................................. 13

1.3.5 Performance Recommendations.................................................. 14

1.4 Connect the Hardware.................................................................................. 14

1.5 Turn It On........................................................................................................ 15

1.6 Align Clock and Data .................................................................................... 15

1.7 Make the Measurement............................................................................... 15

2N4962A System Overview..................................................................................... 17

2.1 Front Panel Quick Reference....................................................................... 19

2.2 Rear Panel Quick Reference........................................................................ 22

2.3Connector Care .............................................................................................. 23

3System Details and Performance Specifications............................................... 25

3.1 General............................................................................................................ 25

3.2 Safety and Regulatory................................................................................... 26

3.3 Internal Clock ................................................................................................. 27

3.4 PRBS Generator............................................................................................. 30

3.5 Error Detector................................................................................................. 32

3.6 Data Path ........................................................................................................ 34

4Operation................................................................................................................. 37

4.1 General Information ...................................................................................... 37

4.1.1 Performance Recommendations.................................................. 38

4.1.2 Connector Care............................................................................... 38

4.2 Front Panel Interface .................................................................................... 39

Contents

8 Serial BERT 12.5 Gb/s User Guide

4.2.1 Front Panel – Display Panel.......................................................... 40

4.2.2 Front Panel – Local, Receiver, and Data Path Controls........... 41

4.2.3 Front Panel – Configuration Adjustment Controls.................... 43

4.2.4 Front Panel – Display Selection Controls................................... 48

4.3 Rear Panel Interface ..................................................................................... 51

4.4 Power-On State.............................................................................................. 53

4.5 System Verification ....................................................................................... 54

4.5.1 Self Test Mode................................................................................ 54

4.5.2 Error Free Test ................................................................................ 55

4.5.3 High BER Test................................................................................. 55

4.5.4 Low BER Test.................................................................................. 56

4.6 BER Detector Clock Phase Adjustment..................................................... 56

4.7 Basic BER Measurement............................................................................. 59

5Remote GPIB Interface.......................................................................................... 61

5.1 GPIB Capabilities........................................................................................... 62

5.2 GPIB Command Syntax ................................................................................ 63

5.2.1 Command Structure....................................................................... 64

5.3 IEEE Common Commands............................................................................ 65

5.4 SCPI Mandated Commands......................................................................... 66

5.5 N4962A Device Commands ......................................................................... 66

5.5.1 Internal Clock Commands............................................................. 67

5.5.2 PRBS Pattern Commands ............................................................. 70

5.5.3 Measurment Commands............................................................... 74

5.6 Examples......................................................................................................... 83

6Returning the N4962A Serial BERT to Agilent Technologies ......................... 87

Getting Started

Serial BERT 12.5 Gb/s User Guide 9

1Getting Started

1.1 General

The N4962A serial BERT 12.5 Gb/s operates from 500 Mb/s

– 12.5 Gb/s

referencing an external clock, and from 9.85

– 11.35 Gb/s with the

programmable internal clock.

The N4962A includes:

•Internal clock system

•PRBS generator

•Error detector

Key Features

•Low cost, high performance

•Programmable output amplitude control

•Electronic receiver clock phase adjust

•Differential inputs and outputs

•Synchronous clock & pattern triggers

•Selectable pattern lengths, mark density

•Data Thru switch on Receiver for use with Oscilloscope on received

data

•Controlled with GPIB control bus format

Internal clock system

•

Internal clock 9.85 to 11.35 GHz

•External clock input for 0.5 to 12.5 GHz operation

PRBS generator

•

Selectable PRBS patterns:

oLengths: 27-1, 210-1, 215-1, 223-1, 231-1

oMark densities: 1/2, 1/4, 1/8

•Adjustable PRBS amplitude:

oVoltage: 0.3 - 1.8 V pp per output

oStep size: 10 mV

Getting Started

10 Serial BERT 12.5 Gb/s User Guide

Error detector

•Automatic sampling point adjustment

•Elapsed time BER measurements

•Manual threshold adjustment)

Operating modes

•

Disabled ('safe mode': no output)

•Enabled (PRBS output enabled)

•Thru (no detector; inputs connected to Data Thru connectors on back

panel)

Display

•

LED indicators

•Multifunction alphanumeric display

Data entry / interface

•

Push-button control (local)

•Remote GPIB (IEEE 488.2-1992)

•Compatible with N4980A multi-instrument BERT software user

interface

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