Tektronix 7D11 User manual

Tektronix,

Inc.

070

-1

329

TEKTRONIX

7011

DIGITAL

DELAY

OPERATORS

INSTRUCTION

MANUAL

P.O. Box

500

Beaverton, Oregon 97005

772

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•

WARRANTY

All

TEKTRONIX instruments are warranted against

defective materials and workmanship for

one

year. Any

questions with respect

the

warranty should be taken up

with

your

TEKTRONIX Field Engineer

representative.

All

requests for repairs and replacement

paru

should be

directed

the

TEKTRONIX Field Office

representative

your

area. This will assure you

the

fastest possible

service. Please include

the

instrument

Type

Number

Part

Number and Serial Number with all requests fOf" parts

Of"

service.

Specifications and price change privileges reserved.

Copyr.,t

1972

Tektronix. Inc.. Beaverton, Oregon.

Printed

the

United States

America.

All

rights reserved.

Cont

ents

this publication may

not

be reproduced

any

form

without

permission

Tektronix, Inc.

U.S.A. and foreign TEKTRONIX products covered by U.S.

and foreign patents and/

patents pending.

TEKTRONIX

a registered trademark

Tektronix. Inc.

SECTION 1

SECTION 2

TABLE

CONTENTS

OPERATING INSTRUCTIONS

7011

Features

Preliminary Information

Installation

Display

Controls and Connectors

General Operating Information

Signal Connection

Count

Mode

Trigger Controls

Triggered Light

Trigger Coupling

Trigger Source

Trigger Slope/Level

Events

Start

Trigger

Delay

Time

Events

Fine Delay

B Sweep Delay Mode

Output

Signals

Front-Panel

Output

Signals

Output

Signals

Mainframe

Operating Modes

Sweep Delay

Echo Delay Time Mode

Applications

General

Delayed-Sweep Time Measurements

Displaying Complex Signals with Delayed Sweep

Pulse

Jitter

Measurements

SPECIFICATION

Introduction

Table 2-1, Electrical Characteristics

Table 2-2, Environmental Characteristics

Table 2-3, Physical Characteristics

Page

1-1

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

2-1

2-2

7011

TRIGGER

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DIGITAL DELAY

7011

Fig.

701

1 Di

git

elav.

Section

1-7011

Operators

OPERATING

INSTRUCTIONS

7011

Features

The

7011

Digital Delay plug-in

unit

designed for use

with

TEKTRONIX

7000-Series Oscilloscope mainframes

equipped

with a

readout

system.

The

7011

uses

the

readout

system

display

the

selected delay

count

the

CRT. A

delayed

trigger

output

generated by

counting

time

events. Digital delay

time

one

second

read

out

in 100-nanosecond increments.

Additional

analog delay

time

from

zero

100

nanoseconds

selected

from

calibrated front-panel dial provides

added

resolution. An

"echo"

time-delay

mode

provides a divide-by-two scaler

read

out

the

"one-way

trip"

time

two

seconds

for

radar ranging and

TOR

applications. Delay time accuracy

controlled

an internal crystal oscillator;

greater

accuracy

can be

obtained

the

use

an external

one-megahertz

standard.

the

Count

Events mode,

the

CRT

readout

displays

the

integer

number

events from

one

events

count

rates

megal:lertz.

The

7011

can

used

delay a 7B-series time-base unit

either

a runs-after

triggerable-after delay

time

mode.

Other

7011

features include on-screen display

delay

interval by vertical signal

display blanking, trigger

pickoff

from

vertical amplifier unit, and blanking

all

zeros

the

left

the

most

significant digit

(Count

Time

mode

only).

PRELIMINARY INFORMATION

Installation

The

7011

designed

operate

any

plug-in

compart-

ment

TEKTRONIX

7000-series mainframes. However,

certain modes

operation

require

the

7011

be installed

in a specific

compartment.

The

unit

must

operated

in a

horizontal

compartment

trigger from a signal applied

a vertical amplifier unit.

The

7011

must be

operated

the

A Horizontal

compartment

control

the

delay

mode

time-base

unit

the

B Horizontal

compartment.

Operation

a vertical

compartment

necessary

view

the

Delay

Interval Pedestal

without

the

use

external

cables.

install

the

7011

into a plug-in

compartment,

push

the

unit

until it

seated flush against

the

front

panel

the

mainframe.

remove, pull

the

release latch

disengage

the

7011.

Continue

pull

the

release latch

remove

the

unit

from

the

mainframe.

Display

The

7011'

readout

display

presented

the

CRT

the

mainframe, along

with

information

encoded

the

other

plug-in units. Digital delay time (in milliseconds)

displayed in

four

eight digits. All zeros

the

left

the

most

significant digit are blanked

out.

The

+ symbol

the

right

the

digital display reminds

the

operator

add

any

analog delay

time

selected

the

FINE DELAY (ns) dial

the

delay time.

The

number

events being countecJ

presented in a seven-digit display.

The

7011

readout

display appears

the

CRT

location corresponding

the

plug-in

compartment

used.

The

delay

time

number

events will be displayed

the

top

division

the

CRT

graticule.

The

delay-time measure-

ment

unit

(ms) will be displayed

the

bottom

division. It

not

necessary

select

the

7011

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.

1-1

Operating I

tru

ctions-

7Dll

Operators

Fig. 1·2.

701

front

·panel

ntrols and

con

tors.

' -2

CONTROLS

AND

CONNECTORS

The major controls

and

connectors

for

operation

the

7D11

are

located on the

front

panel

the

unit.

Two

controls located inside the

unit

for

auxiliary functions

are

described in the General Operating

Information

section.

The front·panel controls

and

connectors

are

identified in

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

B Horizontal compartment

mainframe.

TRIGGER

SLOPE/LEVEL

Controls

Select slope

and

amplitude

point

input

signal

where the delay

initiated.

TRIG'D

Indicator

Lights when a 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

EVENTS Control

Selects delay

time

number

events counted.

Direction

rotation

selects increase

decrease

in delay time

number

events.

FINE

DELAY

(ns)

Dial

Selects analog delay

time

added to digital delay

time selected

DELAY

TIME

OR EVENTS

control.

Operating

Instructions-7011

Operators

DLY'DTRIGOUT

BNC connector

for

Delayed Trigger

output

signal.

EXT

1 MHz

EVENTS

START

TRIG

BNC connector

for

input

external 1 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.

EXTTRIG

BNC connector

for

external

input

Trigger

circuit

(selected

SOURCE switch

the

external positions).

RESET

Resets

the

DELAY

TIME

EVENTS

0000001 (EFF

B030000 and up).

GENERAL

OPERATING

INFORMATION

Signal Connection

In general, probes

offer

the most convenient

means

connecting signals

the 7D

external trigger inputs.

TEKTRONIX

probes

are

shielded

prevent

pickup

electrostatic interference. A

10X

attenuation probe offers a

high

input

impedance and allows the

circuit

under test

perform very close

normal operating conditions. Also, a

10X probe attenuates the

input

signal ten times.

TEKTRONIX

probes

are

designed

monitor

the signal

source

with

minimum

circuit

loading_ The

use

a probe

will,

however,

limit

the maximum trigger frequency range.

obtain maximum trigger bandwidth when using probes,

select a probe capable

compensating the input

capacitance; observe the grounding considerations given in

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

a coaxial cable terminated at

both

ends

in the characteristic impedance

the cable.

maintain

the high-frequency characteristics

the applied signal,

use

high-quality low-loss cable. Resistive coaxial attenuators

can

used

to minimize reflection

the applied signal

has

suitable amplitude.

REV.

JAN

1974 1-3

Operating

Instructions-7D11

Operators

High-level, low-frequency signals can be

connected

directly

the

external

trigger inputs with short, unshielded

leads. When

this

method

used, establish a c'ommon

ground

between

the

7D11 and

the

associated

equipment.

The

common

ground

provided

line

cords

usually

inadequate. If interference

excessive

with

unshielded

leads, use a coaxial cable

probe.

A signal can also be

routed

the

through

amplifier

unit

via

the

internal trigger circuitry

the

mainframe (7D11 installed

a horizontal

compartment).

This

method

signal

connection

minimizes

circuit

loading,

especially

when

triggering a time-base

unit

parallel

with

the

7D11. (NOTE:

Only

external signals can be used

with

the

Events

Start

Trigger.)

The

front-panel

output

signals, DLY'D TR

OUT

and

DLY INTERVAL OUT, should be

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

7D11,

selected

the

COUNT

MODE switch.

The

delay interval in

both

modes

selected

the

DELAY TIME OR EVENTS

control

and

read

out

the

CRT.

TIME

INT

CLOCK.

The

7D11

counts

precise

increments

time

after

the

receipt

a trigger.

The

TRIGGER

controls

select and

condition

the

signal

start

the

time

delay.

Accuracy

this

mode

determined

by an

internal, crystal-controlled oscillator.

TIME EXT 1 MHz. This

count

mode

the

same

TIME INT CLOCK

except

the

accuracy

derived

from

external,

one-megahertz

standard.

EVENTS.

The

7D11

counts

events, periodic

aperiodic,

count

rates

megahertz.

The

EVENTS

START

TRIGGER

provides a means

discriminating

between

the

event

that

starts

the

delay

and

the

events

counted.

The

events

counted

are selected

and

conditioned

the

TRIGGER

controls.

Trigger Controls

The

input

signal may have a wide variety

shapes and

amplitudes,

many

which

are unsuitable

delay-initiating

triggers.

For

this reason,

these

signals are first applied

trigger

circuit

where

they

are conyerted

pulses

uniform

amplitude

and shape. This makes it possible

start

the

delay

with

a pulse

that

has a

constant

size,

eliminating variations

the

delay circuit

operation

caused

by changing

input

signals.

The

IGG

controls

provide

a means

select

the

signal source, filter

unwanted

frequencies, and

start

the

delay

any

voltage level

either

slope

the

waveform.

Triggered

Light

The

IG'D light provides a

convenient

indication

the

Trigger

circuit

condition.

the

TRIGGER

controls

are

correctly

set and an

adequate

signal

applied,

the

TRIG'D

light

on.

the

TRIG'D

light

off,

no delay interval

started.

The

cause might be an incorrectly set TR I

control,

low signal

amplitude,

a signal

repetition

rate

outside

the

usable

frequency

range.

This

feature

can be

used as a general indication

correct

triggering

when

there

display

the

CRT.

The

Delay Interval Pedestal and

Z-Axis Blanking displays also aid in

obtaining

correct

TR I

control

settings. See

the

discussion

these

features

under

Output

Signals

Mainframe for

further

information.

NOTE

When

the 7D11

used

in the EVENTS

count

mode,

the EVENTS

START

TRIGGER affects the

output

the Trigger

circuit

but

has

no effect on the

TRIG'D light.

Trigger Coupling

The

TRIGGER

push

buttons

located below

the

COUP-

LING

title

select

the

method

in which

the

input

signal

connected

the

Trigger circuit. Each position permits

selection

rejection

various

frequency

components

the

signal used

trigger

the

delay start.

AC.

this

position

the

COUPLING switch,

the

component

the

input

signal

blocked. Signals with

low-frequency

components

below

about

hertz

are

attenuated.

In general, AC COUPLI

can be used for

most

applications. However,

the

signal

contains

unwanted

frequency

components

the

delay

be triggered

low

repetition

rate

DC level,

one

the

other

switch

positions will provide

better

results.

'-4

REV.

JAN

1974

®I

The

triggering

point

the

position

depends

upon

the

average voltage level

the

input

signal. If

the

input

signal

occurs

randomly,

the

average voltage level will vary,

causing

the

triggering

point

vary also.

This

shift

the

triggering

point

may

enough

so it

impossible

maintain

stable

delay

start;

such

cases, use DC

coupling.

REJ.

this

positIOn, DC

rejected

and

low-frequency

input

signals

below

about

kilohertz

are

attenuated.

Therefore,

the

delay

triggered

only

the

higher-frequency

components

the

input

signal.

The

LF REJ

position

particularly

useful

for

providing

stable

triggering if

the

input

signal

contains

line-frequency

components.

REJ.

This

COUPLING

switch

position

passes

all

low-frequency

signals

between

about

hertz

and

kilohertz.

rejected

and

signals above

kilohertz

are

attenuated.

This

position

useful

trigger

the

delay

from

the

low-frequency

components

complex

waveform.

DC.

The

DC positIOn can be 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

a DC

level

selected

the

setting

the

SLOPE/LEVEL

control.

When triggering

from

the

internal

source,

the

setting

the

vertical

unit

position

control(s)

affects

the

DC triggering

point.

Trigger Source

The

TRIGGER

push

buttons

located

below

the

SOURCE

title select

the

source

the

signal

connected

the

Trigger

circuit.

INT. In

this

position,

the

input

signal

derived

from

the

associated vertical

unit.

Therefore,

the

7D11

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,

sample

the

power-line voltage

from

the

mainframe

connected

the

Trigger

circuit.

Line triggering

useful

when

the

input

signal

time

(multiple

submultiple)

the

line

frequency.

also useful

for

providing

stable

triggering

from

a line-frequency

component

complex

waveform.

Operating Instructions-7D11 Operators

EXT. A signal

connected

the

EXT

TRIG

connector

can be used

trigger

the

delay

the

EXT

position

the

SOURCE

switch.

external

signal

can

used

provide a trigger

when

the

internal signal ampl

itude

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 a 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 as

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

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

waveform

for

triggering

the

delay

where

the

slope

steep,

and

therefore

usually

free

noise. Assuming a 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 as

the

LEVEL

control

rotated

clockwise

counterclockwise

respectively

from

(towards

symbols

panel).

®I

REV.

JAN

1974 1-5

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