Agilent Technologies 71612 Manuale utente

Thisbookletisintended as a handy reminder of the fundamen-

tals of BER measurement and of how to use the Agilent

71612Error PerformanceAnalyzer for BERmeasurements.

Fulldetails of allthe stepsand procedures are given inthe

71612Operating and Programming Manual.Werecommend

that you readthe fullmanual before using thisbooklet.

Contents

TabTitlePage

Introtothe71612 Agilent 71612 12.5 Gb/sError

Performance Analyzer5

TheFront Panel6

Front/Rear CablingFrontand RearPanelCabling9

Initial Switch-onInitial Switch-on11

PatGen Setup PatternGeneratorSetup12

Error Det SetupError Detector Setup14

Meas Gating MeasurementGating 16

MeasurementsMeasurements17

Pat EditorOperationPatternEditorOperation19

DiskOperationDisk Operation21

GeneralFunctions General Functions 22

The Menus The Menus23

BER - What is it?BER Basics43

BERTDecisionThreshold45

FalseSync 46

TestTime, Confidence Interval

and ResidualBER47

Q Factor48

Eye Contour Measurements50

BERTTroubleshooting 51

Properties of PRBSs54

Logic Levels,Terminations and

DataRate 59

Agilent 71612 Error Performance Analyzer

Quick Reference (71612-90017)

CAUTION

All of the 71612 data and clock outputs

are dc-coupled.

DO NOT APPLY ANY EXTERNAL

VOLTAGE TO THESE OUTPUTS.

This will damage the internal

amplifiers.

Take particular care when using a bias

tee to connect it the correct way.

Intro to the

71612

71612-90017.fm Page 3 Wednesday, July 18, 2001 11:26 AM

Intro to the

71612

71612-90017.fm Page 4 Wednesday, July 18, 2001 11:26 AM

Agilent 71612

12.5 Gb/s Error Performance Analyzer Intro to the

71612

71612-90017.fm Page 5 Wednesday, July 18, 2001 11:26 AM

The Front Panel

The 70004A Display serves as the front panel for

instruments in the 71612 Series, and as your window for

viewing current system configuration and measurement

results.

Instrument Hardkeys

gain instant access to primary

instrument functions such as data output or result pages.

The keys are color-coded to indicate their function:

•Green for configuration keys

•Blue for result pages

•Black for immediate selection keys for gating and audio.

instrument hardkeys

Intro to the

71612

71612-90017.fm Page 6 Wednesday, July 18, 2001 11:26 AM

Instrument Softkeys

select instrument functions. The functions are

organized in groups, called softkey menus.

NOTE Softkeys that are selected are displayed in

inverse video or are underlined.

Some softkeys switch between two states, such as

and . An underline

on the key labels indicates which keys and conditions are

selected.

Softkeys and Windows Color Coding

Softkeys and windows are color coded to indicate the

primary instrument functions with which they are

associated. They are:

•Blue softkeys/window: assigned to Results Page

occupies two thirds of screen.

•Green softkeys/window: assigned to pattern generator/

error detector configuration

•Yellow softkeys - green/yellow window: assigned to

Pattern Editor

•Grey softkeys/window: assigned to user pattern

selection and save.

•Softkeys that are “greyed out”are not valid for the

currently selected instrument function.

Fixed Label Keys

keys select major system functions such

as PRINT, PLOT, INSTR PRESET, DISPLAY or MENU.

softkeys

LOGGING OFF ON SYNC AUTO/MAN

FIXED LABEL

Intro to the

71612

71612-90017.fm Page 7 Wednesday, July 18, 2001 11:26 AM

Access display functions by pressing .This

provides the softkeys on the left and right of the display,

and allows you to set up the display functions.

Access primary instrument functions by pressing .

Both methods enable menus of softkeys that give access to

all instrument functions.

Parameter Control Keys

Display knob Use the display RPG knob to change

parameters and select operating

values.

Numeric keypad Use the numeric keypad to enter

numeric values.

Use the two step keys to change

parameters up or down.

DISPLAY

▲ ▼

Intro to the

71612

71612-90017.fm Page 8 Wednesday, July 18, 2001 11:26 AM

Front and Rear Panel Cabling

System Back-to-Back Connection

Front/Rear

Cabling

71612-90017.fm Page 9 Wednesday, July 18, 2001 11:26 AM

HP-MSIB Cabling, rear panel

Front/Rear

Cabling

71612-90017.fm Page 10 Wednesday, July 18, 2001 11:26 AM

Initial Switch-on

1.For a back-to-back system check, connect up the front

panel as shown on page 9. Otherwise, connect up as

appropriate to your application.

2.Connect the 70843 and 70004A rear-panel HP-MSIB

ports as shown on page 10. If not, the red HP-MSIB

LED on the display will light up.

3.Switch on the instruments in your system and check that

all LEDs light up then go off after a few seconds. The

green ACT LED on the 70843 will be lit up when the

instrument owns the keyboard and display.

4.A lit up red E at the top left of the screen indicates an

error in any instrument on row 0 of the address map.

Refer to the 70004A Display Operation Manual for

information about the address map. The red Ealso blinks

if the display detects a fault on the HP-MSIB at

power-up.

Initial

Switch-on

71612-90017.fm Page 11 Wednesday, July 18, 2001 11:26 AM

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