Tektronix 7812 Manuale utente

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

070-1244-00

Product

Group

97077

Tektrone<

COMMITTED

EXCELLENCE

PLEASE

CHECK

FOR

CHANGE

INFORMATION

THE

REAR

THIS

MANUAL.

7812

TDR/SAMPLER

S/N

B020000-up

INSTRUCTION

MANUAL

Serial

Number

First

Printing

NOV

1971

Revised

JUN

1986

1971

Tektronix,

Inc.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

the

written

permission

Tektronix,

Inc.

Products

Tektronix,

Inc.

and

its

subsidiaries

are

covered

U.S.

and

foreign

patents

and/or

pending

patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

are

registered

trademarks

Tektronix,

Inc.

TELEQUIPMENT

registered

trademark

Tektronix

U.K.

Limited.

Printed

U.S.A.

Specification

and

price

change

privileges

are

reserved.

INSTRUMENT

SERIAL

NUMBERS

Each

instrument

has

serial

number

pariel

insert,

tag,

stamped

the

chassis.

The

first

number

letter

designates

the

country

manufacture.

The

last

five

digits

the

serial

number

are

assigned

sequentially

and

are

unique

each

instrument.

Those

manufactured

the

United

States

have

six

unique

digits.

The

country

manufacture

identified

follows:

Bo00000

Tektronix,

Inc.,

Beaverton,

Oregon,

USA

100000

Tektronix

Guernsey,

Ltd.,

Channel

Islands

200000

Tektronix

United

Kingdom,

Ltd.,

London

300000

Sony/Tektronix,

Japan

700000

Tektronix

Holland,

NV,

Heerenveen,

The

Netherlands

SECTION

7812

TABLE

CONTENTS

CHARACTERISTICS

Description

Electrical

Characteristics

Physical

Characteristics

Environmental

Characteristics

OPERATING

INSTRUCTIONS

General

Information

Installation

Controls

and

Connectors

First

Time

Operation

Voltage

Reflection

Coefficient

Impedance

Scale

Overlays

Time

Distance

Measurements

High

Resolution

Single

Sweep

Operation

PRESET

Calibration

Application

Connections

Using

TDR

Slide

Rule

CIRCUIT

DESCRIPTION

Introduction

Vertical

Circuits

Block

Diagram

Horizontal

Circuits

Block

Diagram

Circuit

Description

MAINTENANCE

Introduction

Lubrication

Troubleshooting

Tape

Dial

Removal

Tape

Dial

Installation

Tape

Dial

Alignment

Revised

NOV

1984

Page

1-1

1-5

2-1

2-5

2-8

2-11

2-12

2-14

3-1

3-4

3-10

4-4

4-1

4-2

SECTION

MAINTENANCE

(cont)

SECTION

Page

Readout

Symbol

Adjustment

}

and

4-2

Repackaging

for

Shipment

4-3

PERFORMANCE

CHECK/ADJUSTMENT

Introduction

5-1

Equipment

Required

5-1

Performance

Check

and

Adjustment

Record

and

Index

5-2

7812

Checks

5-3

S-6,

S-52

and

7S12

System

Checks

5-5

S-5,

S-54

and

7S12

System

Checks

5-7

Adjustment

Procedure

5-9

ELECTRICAL

PARTS

LIST

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Symbols

and

Reference

Designators

Schematic

Diagrams

and

Component

Board

Locations

MECHANICAL

PARTS

LIST

Mechanical

Parts

List

Mechanical

Parts

List

Illustration

Accessories

7$812

—-o

S-6

SAMPLING

HEAD

Fig.

1-1.

7S$12

TDR/Sampler

unit.

ee,

7812

SECTION

CHARACTERISTICS

Description

The

7S12

dual-purpose

plug-in

unit

for

measurement

recurring

fast-rise

signals

or for

time-domain

reflectometry.

occupies

two

compartments

(one

vertical

input

and

one

horizontal

input)

Tektronix

7000-series

oscilloscope.

The

7S12

has

two

compartments

for

plug-in

heads.

The

left-hand

compartment

(labeled

SAMPLING

the

7812

front

panel)

accepts

Tektronix

S-series

Sampling

Heads.

The

type

sampling

head

selected

determines

the

vertical

input

characteristics

the

7S12.

The

right-hand

compart-

ment

(labeled

PULSE

GENERATOR)

accepts

S-series

pulse

generators,

trigger

recognizers

trigger

count-down

heads.

The

7S12

has the

following

features:

The

vertical

de-

flection

factors,

i.e.,

millivolts/div

and

millirho/div,

are

from

500

1-2-5

sequence.

The

time/div

cali-

brated

from

ps/div

Us/div

1-2-5

sequence.

The

OFFSET

control

offsets

the

display

range.

The

RESOLUTION

switch

reduces

the

waveform

noise

and

jitter

signal

averaging

with

corresponding

re-

duction

sweep

rate.

The

LOCATE

switch

increases

the

time/div

and

intensifies

portion

the

display

locate

the

time

window

relative

the

total

waveform.

Front

panel

outputs

include

OFFSET

OUT

(+10

range),

VERTical

SIGnal

OUT

and

SWEEP

OUT.

Modes

sweep

operation

include

SINGLE

sweep,

REPetitive

sweep,

MANual

scan

and

EXTernal

sweep

IN.

The

TIME-DISTANCE

scale

calibrated

for

round-trip

time

measurements

Us and

one-way

distance

measurements

4900

feet

(1500

meters)

air

dielectric

3200

feet

(975

meters)

polyethylene

dielectric.

The

POLY

scale

may

calibrated

for

transmission

lines

which

have

velocity

propagation

equal

greater

than

that

polyethylene.

The

Time-Distance

scale

may

ordered

with

distance

calibrated

metric

units.

SECTION

ELECTRICAL

CHARACTERISTICS

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factor

Accuracy

Within

Range

units/div

500

units/div

1-2-5

sequence.

Units/div

are

labeled

the

sampling

head.

Units/Div

VARIABLE

Range

Provides

continuous

coverage

from

770

units/div

(mV

mp)

CAL

Range

Allows

calibrated

reflection

coefficient

(p)

with

pulse

generators

supplying

from

200

pulse

amplitude.

OFFSET

Range

Offsets

display

least

—-1V.

OFFSET

OUT

Range

least

+10

—10

OFFSET

OUT

10X

(DC

OFFSET)

within

Source

Resistance

within

1-1

Characteristics—7S

Characteristic

Performance

Requirement

Supplemental

Information

VERTical

SIGnal

OUT

Amplitude

200

mV/div

signal

display

within

VARIABLE

control

must

CAL

position.

Source

Resistance

within

.5%

SWEEP

OUT

Amplitude

V/div

horizontal

deflection

within

Range

greater

than

Source

Resistance

within

TIME/DIV

Accuracy

Within

Range

ps/div

uUs/div

1-2-5

sequence

Time/Div

VARIABLE

Range

Provides

continuous

coverage

least

ps/div.

Display

Modes

SINGLE

Sweep

Each

sweep

initiated

pushing

and

releasing

the

START

button.

REPetitive

Sweep

Normal

resolution:

sweep

rate

continuously

variable

from

least

sweep

less

than

sweep

55,

RESOLUTION:

sweep

rate

con-

tinuously

variable

from

least

sweep

200

less

than

sweep

50s.

MANual

Sweep

Any

portion

the

display

may

observed

manual

operation

the

SCAN

control.

EXTernal

Input

Deflection

Factor

V/div

within

least

V/div

Input

Resistance

100

within

10%

Maximum

Input

Voltage

150

(DC

peak

AC)

FINE

(ZERO

SET)

Range

Moves

unmagnified

waveform

least

div.

1-2

Characteristics—7S

ELECTRICAL

CHARACTERISTICS

SYSTEM

PERFORMANCE

WITH

S-6

AND

S-52

Characteristic

Performance

Requirement

Supplemental

Information

Risetime

less

for

the

incident

step,

less

for

the

displayed

reflection

from

short-circuited

test

line

Pulse

Amplitude

least

+200

into

Input

Impedance

Nominal

50 2

Jitter

Less

than

(without

signal

averaging)

Aberrations

Not

than

+7%,

—7%,

total

10%

P-P

within

the

first

1.8

the

step

edge

with

the

reference

level

1.8 ns

from

the

step

edge;

not

than

+2%,

—2%,

total

P-P

after

2.5

from

the

step

edge

with

the

reference

level

0.3

from

the

step

edge.

TIME-DISTANCE

Scale

Time

scale

indicates

round-trip

time.

Distance

scales

(AIR

and

POLY

dielectrics)

indicate

one-way

distance.

The

usable

TIME-DISTANCE

ranges

for

TDR

measurements

are

limited

the

S-52

pulse

duration.

Accuracy

TIME

scale

within

full

scale.

Distance

scales

are

calibrated

for

the

nominal

velocity

propagation

the

AIR

and

POLY

dielectrics.

TIME-DISTANCE

Multiplier

Karl

X10

TIME

Range

Maximum

about

150

one-way

cable

delay.

AIR

Dielectric

Distance

feet

490

feet 4900

feet

Range

15 meters

150

meters|1500

meters

Maximum

about

150

feet

(46

meters)

cable

length.

POLY

Dielectric

Distance

feet

320

feet

3200

feet

Range

9.75

meters

|97.5

meters}

975

meters

Maximum

about

100

feet

(30

meters)

cable

length.

[A]

1-3

Characteristics—7S

Characteristic

Performance

Requirement

Supplemental

Information

PRESET

Permits

the

calibration

the

POLY

scale

for

dielectrics

having

velocity

propagation

between

those

poly-

ethylene

and

air.

ELECTRICAL

CHARACTERISTICS

SYSTEM

PERFORMANCE

WITH

S-5

AND

S-54

Characteristic

Performance

Requirement

Supplemental

Information

Risetime

1.5

less

for

the

displayed

reflection

from

short-circuited

test

line

Pulse

Amplitude

least

+400

into

50 2

Input

Impedance

Nominal

Jitter

Less

than

(without

signal

averaging)

Aberrations

Not

than

+4%,

—6%,

total

10%

P-P

within

the

first

ns of the

step:

not

than

+1.5%,

—1.5%,

total

after

ns.

TIME-DISTANCE

Scale

Time

scale

indicates

round-trip

time.

Distance

scales

(AIR

and

POLY

dielectrics)

indicate

one-way

distance.

TDR

events

out

(round-trip

time)

may

viewed.

This

corresponds

9800

feet

(3000

meters)

AIR

dielectric

and

6400

feet

(1950

meters)

POLY

dielectric.

This

distance

the

sum

the

displayed

time

window

(10

maximum)

and

the

TIME

scale

readout

(10

us maxi-

mum).

Accuracy

TIME

scale

within

full

scale.

Distance

scales

are

calibrated

for

the

nominal

velocity of

propagation

the

AIR

and

POLY

dielectrics.

TIME

Range

TIME-DISTANCE

Multiplier

X.1

X10

-1

additional

time

range

may

viewed.

1-4

—™

Characteristics—7S$

Characteristic

Performance

Requirement

Supplemental

Information

AIR

Dielectric

Distance

Range

feet

490

feet

4900

feet

meters

150

meters

1500

meters

additional

distance

range

may

viewed

(in

terms

time).

POLY

Dielectric

Distance

feet

320

feet

3200

feet

Range

97.5

meters

9.75

meters

975

meters

additional

distance

range

may

viewed

(in

terms

time).

PRESET

Permits

the

calibration

the

POLY

scale

for

dielectrics

having

velocity

propagation

between

those

poly-

ethylene

and

air.

PHYSICAL

CHARACTERISTICS

Characteristic

Performance

Requirement

“\

Finish

Anodized

aluminum

front

panel

Weight

Net

4.7

Domestic

Shipping

|7.2

Export

Packed

11.7

Dimensions

Length

(ex-

cluding

knobs)

13.383

Width

5.464

Height

4.988

ENVIRONMENTAL

CHARACTERISTICS

Characteristic

Performance

Requirement

Temperature

Operating

0°C

+50°C

ENVIRONMENTAL

CHARACTERISTICS

(cont)

Characteristic

Performance

Requirement

Altitude

Operating

15,000

feet

Non-operating

50,000

feet

Vibration

Operating

0.025

P-P

displacement

Shock

Operating

g’s,

1/2

sine,

duration

Humidity

Non-operating

and

Operating

cycles

(120

hours)

95%

relative

humidity

referenced

MIL-E-16400F

(Paragraph

4.5.9

through

4.5.9.5.1,

Class

Non-operating

—40°C

+65°C

Transportation

Qualifies

under

National

Safe

Transit

Committee

test

procedure

1A,

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