Agilent Technologies N4962A Guida Utente

Agilent N4962A Serial BERT 12.5 Gb/s User Guide

Getting Started 10 Serial BERT 12.5 Gb/s User Guide 1.1.3 PRBS generator • Selectable PRBS patterns: o Lengths: 27-1, 210-1, 215-1, 223-1, 231-1 o

Getting Started Serial BERT 12.5 Gb/s User Guide 11 1.2 N4962A Operation Overview The Agilent Technologies N4962A is a cost-effective serial BERT

Getting Started 12 Serial BERT 12.5 Gb/s User Guide 1.3 Getting Started with the N4962A Serial BERT 12.5 Gb/s 1.3.1 Unpacking and Installation The

Getting Started Serial BERT 12.5 Gb/s User Guide 13 1.3.2 Safety and Regulatory This product has been designed and tested in accordance with accep

Getting Started 14 Serial BERT 12.5 Gb/s User Guide 1.3.5 Performance Recommendations • When using differential-mode connections, ensure the cable

Getting Started Serial BERT 12.5 Gb/s User Guide 15 1.6 Align Clock and Data • Press the Data Path > PRBS¯¯¯¯ button only if the DUT is inver

Getting Started 16 Serial BERT 12.5 Gb/s User Guide

N4962A System Overview Serial BERT 12.5 Gb/s User Guide 17 2 N4962A System Overview The N4962A consists of three functional blocks: • Interna

N4962A System Overview 18 Serial BERT 12.5 Gb/s User Guide The PRBS generator creates a continuous bit stream triggered by the input clock rate, confi

N4962A System Overview Serial BERT 12.5 Gb/s User Guide 19 Controls Local (button & light) – indicates local (vs. remote) control; button selec

Notices © Agilent Technologies, Inc. 2012 No part of this manual may be reproduced in any form or by any means (including electronic storage and ret

N4962A System Overview 20 Serial BERT 12.5 Gb/s User Guide Table 1. Configuration state details (shown on display panel, default in BOLD) Config Stat

N4962A System Overview Serial BERT 12.5 Gb/s User Guide 21 2.2 Rear Panel Quick Reference Figure 4. N4962A rear panel Connectors DataThru¯¯¯¯¯

N4962A System Overview 22 Serial BERT 12.5 Gb/s User Guide 2.3 Connector Care Refer to the N4960-90030 N495xA through N498xA Connector Care Reference

System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide 23 3 System Details and Performance Specifications Specificatio

System Details and Performance Specifications 24 Serial BERT 12.5 Gb/s User Guide 3.2 Safety and Regulatory Do not remove instrument covers. There a

System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide 25 Figure 5. N4962A block diagram – internal clock system The inte

System Details and Performance Specifications 26 Serial BERT 12.5 Gb/s User Guide Table 3. Parameters for N4962A internal low-frequency clock (LF Tri

System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide 27 The TX clock, available from the buffered HF TrigO and TX CKO con

System Details and Performance Specifications 28 Serial BERT 12.5 Gb/s User Guide Figure 6. N4962A block diagram – PRBS generator The PRBS output bi

System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide 29 The PRBS bit stream consists of data generated by one of five pat

Safety Summary General Safety Precautions The following general safety precautions must be observed during all phases of operation of this instrumen

System Details and Performance Specifications 30 Serial BERT 12.5 Gb/s User Guide Figure 7. N4962A block diagram – error detector The error detector

System Details and Performance Specifications Serial BERT 12.5 Gb/s User Guide 31 Table 8. Parameters for N4962A error detector (IN, IN¯¯) Data ra

System Details and Performance Specifications 32 Serial BERT 12.5 Gb/s User Guide 3.6 Data Path The N4962A can operate in one of three data path conf

Operation Serial BERT 12.5 Gb/s User Guide 33 4 Operation The following section provides detailed information regarding the use of the N4962A

Operation 34 Serial BERT 12.5 Gb/s User Guide 4.1.1 Performance Recommendations Follow the following recommendations for best performance: • When us

Operation Serial BERT 12.5 Gb/s User Guide 35 4.2 Front Panel Interface Figure 8. N4962A front panel The N4962A front panel indicates system co

Operation 36 Serial BERT 12.5 Gb/s User Guide 4.2.2 Front Panel – Display Panel Figure 9. N4962A front panel – display panel Table 11. N4962A fr

Operation Serial BERT 12.5 Gb/s User Guide 37 4.2.3 Front Panel – Local, Receiver, and Data Path Controls Figure 10. N4962A front panel – loca

Operation 38 Serial BERT 12.5 Gb/s User Guide Data Path -> PRBS¯¯¯¯ Invert button & light Light indicates inverted PRBS generator output: • OFF

Operation Serial BERT 12.5 Gb/s User Guide 39 4.2.3 Front Panel – Configuration Adjustment Controls Figure 11. N4962A front panel – configuratio

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 Ca

Operation 40 Serial BERT 12.5 Gb/s User Guide Text Type Description Default Adjust -> Ø UP and DOWN buttons Buttons adjust BER clock phase by 2 deg

Operation Serial BERT 12.5 Gb/s User Guide 41 Text Type Description Default JitterI port. • Synth 1 o options: 0, 1 Internal clock setting: 0 =

Operation 42 Serial BERT 12.5 Gb/s User Guide Text Type Description Default sequence. When the source is used with the error detector, this value shou

Operation Serial BERT 12.5 Gb/s User Guide 43 Text Type Description Default measurement depth (BER) is: )()()(1BERMeasDepthstimeGHzFreqeCI××−−= •

Operation 44 Serial BERT 12.5 Gb/s User Guide 4.2.5 Front Panel – Display Selection Controls Figure 12. N4962A front panel – display selection con

Operation Serial BERT 12.5 Gb/s User Guide 45 Text Type Description Default • ε time (sec) Displays the elapsed time of the BER measurement, in sec

Operation 46 Serial BERT 12.5 Gb/s User Guide Text Type Description Default will remain on the Config State display item. For example, the first state

Operation Serial BERT 12.5 Gb/s User Guide 47 The Pat TrigO connector is an output pattern trigger from the PRBS generator. The Pat TrigO signal ch

Operation 48 Serial BERT 12.5 Gb/s User Guide 4.4 Power-On State The power-on state of the N4962A is set after turning the rear Power switch on. The

Operation Serial BERT 12.5 Gb/s User Guide 49 4.5 System Verification When first using the N4962A and before using the machine to test an external

Environmental Information This product complies with the WEEE Directive (2002/96/EC) marketing requirements. The affixed label indicates that you

Operation 50 Serial BERT 12.5 Gb/s User Guide 4.5.2 Error Free Test When the error detector clock phase is correctly adjusted, the default settings w

Operation Serial BERT 12.5 Gb/s User Guide 51 4.5.4 Low BER Test To verify that the error detector can correctly count a small number of errors, u

Operation 52 Serial BERT 12.5 Gb/s User Guide If the sampling point occurs near the PRBS transition point, the sampled value is uncertain and many bit

Operation Serial BERT 12.5 Gb/s User Guide 53 • Record the second phase value; the optimum point is halfway between the two values • Press the Ad

Operation 54 Serial BERT 12.5 Gb/s User Guide • Press the Display > Scroll ↓ button and select Ø • Press the Adjust > Config State + button to

Remote GPIB Interface Serial BERT 12.5 Gb/s User Guide 55 5 Remote GPIB Interface The N4962A can be controlled and queried with the rear-panel

Remote GPIB Interface 56 Serial BERT 12.5 Gb/s User Guide 5.1 GPIB Capabilities The GPIB interface capabilities are described in Table 17. Table 17.

Serial BERT 12.5 Gb/s User Guide 57 5.2 GPIB Command Syntax The N4962A can be controlled through the GPIB interface using commands and queries. T

Remote GPIB Interface 58 Serial BERT 12.5 Gb/s User Guide 5.2.1 Command Structure The GPIB interface allows commands, which tell the instrument to ta

Serial BERT 12.5 Gb/s User Guide 59 5.3 IEEE Common Commands The IEEE 488.2 standard has a list of reserved commands that must be implemented by

Remote GPIB Interface 60 Serial BERT 12.5 Gb/s User Guide 5.4 SCPI Mandated Commands The N4962A also conforms to the Standard Commands for Programmab

Serial BERT 12.5 Gb/s User Guide 61 Command Parameters / Results :SOURce:VOLTage:[LEVel]:[AMPLitude] {? | {300 <= value <= 1800}} :MODe {? |

Remote GPIB Interface 62 Serial BERT 12.5 Gb/s User Guide Command :SOURce:ROSCillator:SOURce {INTernal | EXTernal} Type Command Description Selects th

Serial BERT 12.5 Gb/s User Guide 63 Command :SOURce:ROSCillator:[INTernal]:FREQuency {9850 <= value <= 11350} Type Command Description Sets

Remote GPIB Interface 64 Serial BERT 12.5 Gb/s User Guide Command :SOURce:ROSCillator:JITTer {ON| OFF} Type Command Description Sets the jitter inject

Serial BERT 12.5 Gb/s User Guide 65 5.5.2 PRBS Pattern Commands Command :SOURce:PATTern? Type Query Description Returns the current PRBS pattern

Remote GPIB Interface 66 Serial BERT 12.5 Gb/s User Guide Command :SOURce:PRBS:MARKspace? Type Query Description Returns the current PRBS pattern mark

Serial BERT 12.5 Gb/s User Guide 67 Command :SOURce:PRBS:INVert? Type Query Description Returns the current PRBS invert setting. Results {ON | OFF

Remote GPIB Interface 68 Serial BERT 12.5 Gb/s User Guide Command :SOURce:PRBS:IERR:RATe? Type Query Description Returns the current error injection r

Serial BERT 12.5 Gb/s User Guide 69 Command :SOURce:VOLTage:AMPLitude? Type Query Description Returns the current single-ended PRBS output amplitu

Serial BERT 12.5 Gb/s User Guide 7 Contents 1 Getting Started ...

Remote GPIB Interface 70 Serial BERT 12.5 Gb/s User Guide 5.5.3 Measurement Commands Command :MODe? Type Query Description Returns the current data p

Serial BERT 12.5 Gb/s User Guide 71 Command :SENSe:NOData? Type Query Description Returns the state of the data sense option. Results {ON | OFF} E

Remote GPIB Interface 72 Serial BERT 12.5 Gb/s User Guide Command :SYSTem:STATus? {BITERROR | NODATA | NORXCLK} Type Query Description Returns the sta

Serial BERT 12.5 Gb/s User Guide 73 Command :SENSe:APTime {1 <= value <= 5000} Type Command Description Sets the desired autophase measureme

Remote GPIB Interface 74 Serial BERT 12.5 Gb/s User Guide Command :SENSe:ROSCillator:PHASe {AUTO | {0 <= value <= 360}} Type Command Description

Serial BERT 12.5 Gb/s User Guide 75 Command :SENSe:SWEep:TIME {0.001 <= value <= 4194303.999} Type Command Description Sets the desired meas

Remote GPIB Interface 76 Serial BERT 12.5 Gb/s User Guide Command :SENSe:TRAIn {10 <= value <= 6500} Type Command Description Sets the desired t

Serial BERT 12.5 Gb/s User Guide 77 Command :INITiate:BER Type Command Description Latches data on BERT board; equivalent to turning on the receiv

Remote GPIB Interface 78 Serial BERT 12.5 Gb/s User Guide Command :TRIGger:SAMPle Type Command Description Takes sample of current measurement. Does n

Serial BERT 12.5 Gb/s User Guide 79 Example OUTPUT 725; ":SENS:SWE:TIME 10" OUTPUT 725; ":TRIG:INIT" WAIT 2 OUTPUT 725; "

8 Serial BERT 12.5 Gb/s User Guide 3.6 Data Path ...

Remote GPIB Interface 80 Serial BERT 12.5 Gb/s User Guide Example OUTPUT 725; ":SENS:SWE:TIME 10" OUTPUT 725; ":TRIG:INIT" WAIT 2

Serial BERT 12.5 Gb/s User Guide 81 The next block of code shows how to save the instrument state in one of the save/recall registers (0-9), how t

Remote GPIB Interface 82 Serial BERT 12.5 Gb/s User Guide This block of code shows how to change system configuration settings, such as the PRBS patte

Serial BERT 12.5 Gb/s User Guide 83 The N4962A has a programmable error injection that can be set from 1error/sec to 1E7 errors/sec in logarithmic

Remote GPIB Interface 84 Serial BERT 12.5 Gb/s User Guide After running for 5 seconds, the program outputs a string with TOTAL-BITS, TOTAL-ERRORS, ELA

Returning the N4962A Serial BERT to Agilent Technologies Serial BERT 12.5 Gb/s User Guide 85 6 Returning the N4962A Serial BERT to Agilent Tec

Returning the N4962A Serial BERT to Agilent Technologies 86 Serial BERT 12.5 Gb/s User Guide

© Copyright Agilent Technologies 2012 Fourth edition, April 2014 Printed in Germany

Getting Started Serial BERT 12.5 Gb/s User Guide 9 1 Getting Started 1.1 General The N4962A serial BERT 12.5 Gb/s operates from 500 Mb/s – 12