Tektronix 7D11 Manuale utente

TEKTRONIX

7D11

DIGITAL

OPERATORS

INSTRUCTION

MANUAL

Tektronix,

Inc



P.O

Box

500



Beaverton,

Oregon

97005

070-1329-00



772

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against

defective materials

and

workmanship

for

one

year

Any

questions

with

respect to the

warranty

should

taken

with

your

TEKTRONIX

Field

Engineer

representative

All

requests for

repairs

and

replacement

parts

should

directed

the

TEKTRONIX

Field

Office or

representative

your

area

This

will

assure

you

the

fastest

possible

service

Please

include the

instrument

Type

Number

or Part

Number

and

Serial

Number

with

all

requests for

parts

service

Specifications

and

price

change

privileges

reserved

1972

Tektronix,

Inc

Beaverton,

Oregon

Printed

the

United

States of

America

All rights

reserved

Contents

this

publication

may

not

reproduced

any

form

without

permission

Tektronix,

Inc

and

foreign

TEKTRONIX

products

covered

and

foreign

patents

and/or

patents

pending

TEKTRONIX

registered

trademark

Tektronix,

TABLE

CONTENTS

SECTION

SECTION2

OPERATING

INSTRUCTIONS

Page

7Q11

Features

1-1

Preliminary

Information

Installation

1-1

Display

1-1

Controls

and

Connectors

1-3

General

Operating Information

Signal

Connection

1-3

Count

Mode

1-4

Trigger

Controls

1-4

Triggered

Light

1-4

Trigger

Coupling

1-4

Trigger

Source

1-5

Trigger

Slope/Level

1-5

Events

Start

Trigger

1-5

Delay

Time

Events

1-6

Fine

Delay

1-6

Sweep

Delay

Mode

1-6

Output

Signals

Front-Panel

Output

Signals

1-6

Output

Signals

Mainframe

1-7

Operating

Modes

Sweep

Delay

Echo

Delay

Time

Mode

Applications

General

1-9

Delayed-Sweep

Time

Measurements

1-9

Displaying

Complex

Signals

with

Delayed

Sweep

1-9

Pulse

Jitter

Measurements

1-10

SPECIFICATION

Introduction 2-1

Table

2-1,

Electrical

Characteristics

2-1

Table

2-2,

Environmental

Characteristics

2-2

Table

2-3,

Physical

Characteristics

2-2

INS

tol

ci"AM

Fig

1-1

71311

Digital

Delay

71311

Features

The

71311

Digital

Delay

plug-in unit

designed

for

use

with

TEKTRONIX

7000-Series

Oscilloscope

mainframes

equipped

with

readout

system

The

71311

uses

the

readout

system

display

the

selected

delay

count on

the

CRT

delayed

trigger

output

generated

counting

time

events

Digital

delay

time

one

second

read

out

100-nanosecond

increments

Additional

analog

delay

time

from

zero

100

nanoseconds

selected

from

calibrated

front-panel

dial

provides

added

resolution

"echo"

time-delay

mode

provides

divide-by-two

scaler

read

out the

"one-way

trip"

time

two

seconds

for

radar ranging

and

TDR

applications

Delay

time

accuracy

controlled

internal crystal

oscillator

;

greater

accuracy

can

obtained

the

use

external

one-megahertz

standard

the

Count

Events

mode,

the

CRT

readout

displays

the

integer

number

events

from

one

events

count

rates

megahertz

The

71311

can

used

delay

7B-series

time-base

unit

either

runs-after

triggerable-after

delay

time

mode

Other

71311

features

include

on-screen

display

delay

interval

vertical signal

display blanking,

trigger

pickoff

from

vertical

amplifier

unit,

and

blanking

all

zeros

the

left

the

most

significant

digit

(Count

Time

mode

only)

Installation

The

71311

designed

operate

any

plug-in

compart-

ment

TEKTRONIX

7000-series

mainframes

However,

certain

modes

operation

require

the

71311

installed

specific

compartment

The

unit

must

operated

horizontal

compartment

trigger

from

signal

applied

OPERATING

INSTRUCTIONS

PRELIMINARY

INFORMATION

Section

1-71311

Operators

vertical

amplifier

unit

The

71311

must

operated

the

Horizontal

compartment

control

the

delay

mode

time-base

unit

the

Horizontal

compartment

Operation

vertical

compartment

necessary

view the Delay

Interval

Pedestal

without the

use

external

cables

install

the

71311

into

plug-in

compartment,

push

the

unit

until

it is

seated

flush

against

the

front panel

the

mainframe

remove,

pull

the

release

latch

disengage the

71311

Continue

pull

the

release

latch

remove

the

unit

from

the

mainframe

Display

The

71311'

readout

display

presented

the

CRT

the

mainframe,

along

with

information

encoded

the

other

plug-in

units

Digital

delay

time

(in

milliseconds)

displayed

four

eight

digits

All

zeros

the

left

the

most

significant

digit

are

blanked out

The

symbol

the

right

the

digital

display

reminds

the

operator

addany

analog

delay

time

selected

the

FINE

DELAY

(ns)

dial

the

delay

time

The

number

events

being

counted

presented

seven-digit

display

The

71311

readout

display

appears

the

CRT

location

corresponding

the

plug-in

compartment

used

The

delay

time

number

events

will

displayed

the

top

division

the

CRT

graticule

The

delay-time

measure-

ment

unit (ms)

will

displayed

the

bottom

division

not

necessary

select

the

71311

with

the

mainframe

Vertical

Horizontal

Mode

switches

view

the

digital

display

order

view

the

Delay

Interval

Pedestal

waveform,

selection

with

the

Vertical

Mode

switch

required

Operating

Instructions-7D11

Operators

Fig

7D11

front-panel controls

and

connectors

CONTROLS

AND

CONNECTORS

The

major

controls

and

connectors

for

operation

the

71311

are

located

the

front panel

of the

unit

Two

controls

located

inside

the

unit

for

auxiliary

functions are

described

the

General

Operating

Information

section

The

front-panel

controls

and

connectors

are

identified

Fig

1-2

;

their

functions

are

follows

COUNT

MODE

Switch

Selects

mode

operation

and

clock-signal

source for

Time

count

mode

SWEEP

DELAY

MODE

Switch

Selects

the

delay

mode

logic

for time-base

unit

Horizontal

compartment

mainframe

TRIGGER

SLOPE/LEVEL

Controls

Select

slope

and

amplitude

point

input

signal

where

the

delay

initiated

TRIG'D

Indicator

Lights

when

trigger

produced

COUPLING

Switch

Selects

the

method

coupling

the

input

signal

the

Trigger

circuit

SOURCE

Switch

Selects

Trigger

input

signal

source

EVENTS

START

TRIGGER

SLOPE/LEVEL

Controls

Select

slope

and

amplitude

point

input

signal

where

the

Events

Start

count

initiated

DELAY

TIME

OREVENTS

Control

Selects

delay

time

number

events

counted

Direction

of rotation

selects

increase

decrease

delay

time

number

of events

FINE

DELAY

(ns)

Dial

Selects

analog

delay

time

added

digital

delay

time

selected

DELAY

TIME

OR EVENTS

control

REV

JAN

1974



DLY'D

TRIG

OUT

Operating

Instructions-71371

Operators

BNC

connector

for

Delayed

Trigger

output

signal

EXT

MHz

IN or

EVENTS

START

TRIG

BNC

connector

for

input

external

MHz

time-reference

signal

input

Events

Start

Trigger input

signal

Connector

function

deter-

mined

setting

COUNT

MODE

switch

DLY

INTERVAL

OUT

BNC

connector

for

Delay

Interval

output

signal

EXT

TRIG

BNC

connector

for

external

input

Trigger

circuit

(selected

SOURCE

switch

the

external

positions)

GENERAL

OPERATINGINFORMATION

Signal

Connection

RESET

Resets

the

DELAY

TIME

OR EVENTS

0000001

(EFF

B030000

and

up)

general,

probes

offer

the

most

convenient

means

connecting

signals

the

71311

external

trigger

inputs

TEKTRONIX

probes

are

shielded

prevent

pickup

electrostatic

interference

10X

attenuation

probe

offers

high

input

impedance

and

allows the

circuit

under

test

perform

very

normal

operating

conditions

Also,

10X

probe

attenuates

the

input

signal

ten

times

TEKTRONIX

probes

are

designed

monitor

the

signal

source

with

minimum

circuit

The

use

a probe

will,

however,

limit

the

maximum

trigger

frequency

range

obtain

maximum

trigger

bandwidth

when

using

probes,

select

probe

capable

of compensating

the

input

capacitance

;

observe

the

grounding

considerations given

the

probe

manual

The

probe-to-connector

adapters

and

the

bayonet-ground

tip

provide

the

best

frequency

response

high-frequency

applications,

requiring

maximum

over-

all

bandwidth, use

coaxial

cable

terminated

both

ends

the

characteristic

impedance

the

cable

maintain

the

high-frequency

characteristics

the

applied

signal,

use

high-quality

low-loss

cable

Resistive

coaxial

attenuators

can

be used

minimize

reflection

the

applied

signal

has

suitable

amplitude

Operating

Instructions-71311

Operators

High-level,

low-frequency

signals

can be connected

directly

the

external

trigger

inputs

with

short,

unshielded

leads

When

this

method

used,

establish

common

ground

between

the

71311

and the

associated

equipment

The

common

ground

provided

line

cords

usually

inadequate

interference

excessive

with

unshielded

leads,

use

coaxial

cable

probe

signal

can

also

routed

the

71311

through

amplifier

unit

via

the

internal

trigger

circuitry

the

mainframe

(71311

installed

horizontal

compartment)

This

method

signal

connection minimizes

circuit

loading,

especially

when

triggering

time-base

unit

parallel

with

the

71311

(NOTE

Only

external

signals

can be

used

with

the Events

Start

Trigger

The

front-panel

output

signals,

DLY'D

TRIG

OUT

and

DLY

INTERVAL

OUT,

should

connected

other

equipment

with

50-ohm

coaxial

cables

The

cables

should

terminated

ohms

maintain

the

rise

and

falltime

characteristics

these

signals

Count

Mode

General

Two

basic

count

modes,

Time

and

Events,

can

performed

the

71311,

selected

the

COUNT

MODE

switch

The

delay

interval

both

modes

selected

the

DELAY

TIME

EVENTS

control

and

read

out

the

CRT

TIME

INT

CLOCK

The

71311

counts

precise

increments

time

after

the

receipt

trigger

The

TRIGGER

controls

select

and

condition the

signal

start

the

time

delay

Accuracy

in this

mode

determined

internal,

crystal-controlled

oscillator

TIME

EXT

MHz

This

count

mode

the

same

TIME

CLOCK

except

the

accuracy

derived

from

external,

one-megahertz

standard

EVENTS

The

71311

counts

events,

periodic

aperiodic,

count

rates

megahertz

The

EVENTS

START

TRIGGER

provides

means

of discriminating

between

the

event

that

starts

the

delay

and

the

events to be

counted

The

events

counted

are

selected

and

conditioned

by the

TRIGGER

controls

REV

JAN

1974

Trigger

Controls

The

input

signal

may

have

wide

variety

of shapes

and

amplitudes,

many

which

are

unsuitable

delay-initiating

triggers

For

this

reason,

these

signals

are

first

applied

trigger

circuit

where

they

are

converted

pulses

uniform

amplitude

and shape

This

makes

possible

start

the

delay

with

pulse

that

has

constant

size,

eliminating

variations

the

delay

circuit

operation caused

changing

input

signals

The

TRIGGER

controls

provide

means

select

the

signal

source,

filter

unwanted

frequencies,

and

start

the

delay

any

voltage

level

either

slope

the

waveform

Triggered

Light

The

TRIG'D

light

provides

convenient

indication

the

Trigger

circuit

condition

the

TRIGGER

controls

are

correctly

set

and

an adequate

signal

applied,

the

TRIG'D

light

the

TRIG'D

light

off,

delay

interval

started

The

cause

might

be an

incorrectly

set

TRIGGER

control,

low

signal

amplitude,

signal

repetition

rate

outside

the

usable

frequency

range

This

feature

can

used

general

indication

correct

triggering

when

there

display

on the

CRT

The

Delay

Interval

Pedestal

and

Z-Axis

Blanking

displays

also

aid

obtaining

correct

TRIGGER

control

settings

See the

discussion of

these

features

under

Output

Signals

Mainframe

for

further

information

NOTE

When

the

71311

used

the

EVENTS

count

mode,

the

EVENTS

START

TRIGGER

affects

the

output

the

Trigger

circuit

but

has

effect

on the

TRIG'D

light

Trigger

Coupling

The

TRIGGER

pushbuttons

located

below

the

COUP-

LING

title

select

the

method

which

the

input

signal

connected

the

Trigger

circuit

Each

position

permits

selection

rejection

various

frequency

components

the

signal

used

trigger

the

delay

start

In this

position

the

COUPLING

switch,

the

component

the

input

signal

blocked

Signals

with

low-frequency

components

below

about

hertz

are

attenuated

general,

COUPLING

can

used

for

most

applications

However,

the

signal

contains

unwanted

frequency

components

the

delay

triggered

low

repetition

rate

level,

one

the

other

switch

positions

will

provide

better

results

The

triggering

point

the

position

depends

upon

the

average voltage

level

the

input

signal

the

input

signal

occurs

randomly,

the

average

voltage

level will

vary,

causing

the

triggering

point

to vary

also

This

shift

the

triggering

point

may

enough

it is

impossible

maintain

stable

delay

start

;

such

cases,

use

coupling

REJ

this

position,

rejected

and

low-frequency

input

signals

below

about

kilohertz

are

attenuated

Therefore,

the

delay

triggered

only

the

higher-frequency

components

the

input

signal

The

REJ

position

particularly

useful

for

providing

stable

triggering

the

input

signal

contains

line-frequency

components

REJ

This

COUPLING

switch

position

passes

all

low-frequency

signals

between

about

hertz

and 50

kilohertz

rejected

and

signals

above

kilohertz

are

attenuated

This

position

useful

trigger

the

delay

from

the

low-frequency

components

complex

waveform

The

position

can

used

provide

stable

triggering

from

low-frequency

low-repetition-rate

signals

which

would

attenuated

other

modes

can

also

used

trigger

the

delay

when

the

input

signal

reaches

level

selected

the

setting

the

SLOPE/LEVEL

control

When

triggering

from

the

internal

source,

the

setting

the

vertical

unit

position control(s)

affects

the

triggering

point

Trigger

Source

The

TRIGGER

pushbuttons

located

below

the

SOURCE

title

select

the source

the

signal

connected

the

Trigger

circuit

INT

this

position,

the

input

signal

derived

from

the

associated

vertical

unit

Therefore,

the

71311

must

installed

horizontal

compartment

use the

internal

source

Further

selection

the

internal

signal

may

provided

the

vertical

unit

and

mainframe

;

see

the

instruction

manuals

for

these instruments

for

further

information

LINE

In this

SOURCE

switch

position,

a sample of

the

power-line

voltage

from

the

mainframe

connected

the

Trigger

circuit

Line

triggering

useful

when

the

input

signal

time

related (multiple

submultiple)

the

line

frequency

also

useful

for

providing

stable

triggering

from

line-frequency

component

complex

waveform

REV

JAN

1974

EXT

signal

connected

the

EXT

TRIG

connector

can

used

trigger

the

delay

the

EXT

position

the

SOURCE

switch

external

signal

can be

used

provide

trigger

when

the

internal

signal

amplitude

too low

EXT

=10

Operation

this

position

the

same

described

for

EXT

except

the

external

signal

attenuated

times

Attenuation

high-amplitude

signals

desirable

extend

the

range

the

LEVEL

control

Trigger

Slope/Level

The

TRIGGER

SLOPE/LEVEL

controls

determine

the

slope

and

voltage

level

the

input

signal

where

the

Trigger

circuit

responds

Generally,

the

best

point

waveform

for

triggering

the

delay

where

the

slope

steep,

and

therefore usually

free

noise

Assuming

sine-wave

input

waveform,

the

steepest

slope

occurs

the

zero-crossing

point

This

the

point

selected

for

triggering

when

the

LEVEL

control

set

(center)

positive

negative

point

the

waveform

selected

the

LEVEL

control

rotated

clockwise

counterclockwise

respec-

tively

from

(towards

symbols

panel)

Before

setting

the

TRIGGER

LEVEL,

the

desired

SLOPE,

MODE,

COUPLING,

and

SOURCE

should

selected

Then

adjust

the

LEVEL

control

the

delay

starts

from

the

desired

point

Events

Start

Trigger

Operating

Instructions-71311

Operators

The

Events

Start

Trigger

used

the

EVENTS

count

mode

differentiate

between

the

event

that

starts

the

delay

and

the events

being

counted

The

EVENTS

START

TRIG

connector

provides

the

input

the

events-start

signal

The

EVENTS

START

TRIGGER

SLOPE

and

LEVEL

controls

select

the

ampli-

tude

point

and

slope

the

input

signal

where

the

delay

triggered

Generally,

the

best

point

on a

waveform

for

triggering

the

delay

where

the

slope

steep,

and

therefore

usually

free

noise,

Assuming

sine-wave

input

waveform,

the

steepest slope

occurs

the

zero-crossing

point

This

the

point

selected

for

triggering

when

the

LEVEL

control

set

(center)

positive

or negative

point

the

waveform

selected

the

LEVEL

control

rotated

clockwise

counterclockwise

respectively

from

(towards

symbols

panel)

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