Tektronix 7A17 Manuel utilisateur

Tektronbc@

PLE

AS

E

C

HE

C

KF

O

R

C

H

A

N

G

E

I

NF

O

RM

ATIO

N

AT

THE

RE

A

R

OF

TH

IS

M

A

NU

A

L

.

7

Α

17

A

MPL

I

F

I

ER

I

N

ST

RU

CTIO

N

M

A

NU

A

L

Te

k

t r

on

ix,

Inc

.

Ρ

.

Ο

.

Box

500

B

eave

r

ton,

O

r

ego

n

97077



Serial

N

um

b

er

CO

MM

ITT

E

D

TO

E

XC

ELLEN

C

E

070-1263-00



F

i

r

st Pr

i

n

ti

ng

OCT

1971

Pr

o

du

ct

G

r

o

up 42



R

evise

d

A

PR

1984

Co

p y

r

ig

h

t

C

1971

Tek

t r

o

n

ix,

Inc

.

All rig

h

ts

r

ese

r

ved

.

Co

n

tents

of

t

h

is

p

ublication

may

n ot b

e

r

e

prod

uced

in

any

form

wit h

out

t

h e

writte

n perm

issio

n

of

Te

k tro

n

ix,

I

n c

. .

P

ro

du

cts

of

Te

k

t r

onix,

Inc

.

a n

d

its

subsi

d

ia

r

ies

a

r

e

cove

r

ed

by U

.S

.

and

foreig

n p

ate

n

ts

a

nd

/or

pe

n

di

n g p

atents

.

T

EK

T

RO

N

IX,

ΤΕΚ

,

SCO

PE-M

O

B

I

LE,

and



a

r

e

r

egiste

r

e d

tr

a

d

emar

k s of

Te

k

t r

o

n

ix,

Inc

.

T

ELE

Q

U

I

PMEN

T

is

α

registere

d

tr

adema

rk of

Te

k

t

r

on

ix

U

.K

.

L

imite

d

.

Pr

i

n te

d

i

n

U

.S .A

.

Specificatio

n

an

dprice

cha

n

ge

pr ivileges

are

rese

r

ved

.

I

NST

RUMEN

T

S

ER

IA

L

NUMBER

S

E

ach

instr u

ment has

α

serial

nu

m

b

er

on α

p

a6el

i

n

sert, tag,

or

sta

mp

ed

on

t

he

c h

assis

.

T

he

fi

r

st

nu

m

b

e

r

o

r

lette

r

d

esig

n

ates

th

e

co un

try

of

ma

nu

fact

ur

e

.

T

he

last

five

d

igits

of

t

h e

se

r ial

nu

m

be

r

a

r

e

assig

n

e

d

sequ

e n

tially

an

d

a

re

u n

ique

to

eac

h

i

n

st

r

ume

n

t

.

Those

m

anufact

ur

ed

in

t

h e

U

nite

d

States

have

six

un

i

que

d

igits

.

T

h

e coun

try of

m

an

ufact

ur e

is

i

d

e n

tifie

d as

follows

:

ΒΟΟΟΟΟΟ



Te

k

t

r

on

ix,

Inc

.,

B

eaverto

n

,

O

r

egon,

USA

100000



Te

k

t

r

onix

Gue

rn

sey,

L

td

.,

C

ha

nn

el

Isla

n

ds

200000



Te

k

t r

on

ix

U

nite

d

K

i

n g

dom, L

td

.,

L

ondo

n

300000



So

n

y/Te

k

tronix,

Japan

700000



Te

k

t r

o

n

ix

H

olla

n

d,

NV,

H

eere

n

veen

,

T

heN

et h

e

r

la

nds

TA

BLE

O

F

CO

N

T

EN

TS

P

age

SPE

CIF

ICATIO

N

O

PER

ATI

NG

I

NSTRU

CTIO

NS



1

CI

R

C

U

IT

O

PER

ATIO

N

1

M

AI

N

T

ENA

N

C

E

CA

L

I

BR

ATIO

N

2

APPL

ICATIO

NS

ELE

CT

R

ICA

L

P

A

RTS

L

IST

DIAG

R

A

M

SAND

CI

RC

U

IT

B

OA

RD

I

LLU

STR

ATIO

NS

MEC

HAN

ICA

L

PARTS

L

IST

7

Α

17

ADD

OCT

1983

7

Α

17

I

N

ST

RU

CTIO

N

M

A

NU

A

L

SPECIFICATION



i

n

stall,

alig

n

t

h

e

upp

e

r

and

lowe

r r

ails

of

t

h

e

7

Α

17 with

t

he

plug-in

co

m

pa

r t

m

ent

t

r

ack

s

an

d

fully

inse

r t it (t

h

e

Ge

n

e

r

al



pl

u

g-i

n p

a

n

el

m

ust

be

fl

u

s

h with

t

he

oscilloscope

p

anel)

.

7

Α

17

is

αu

tility

plug-in

d

esig

ned

for

u

se

w

it

h

To

r

e

m

ove, pull

t

he

release

latc

h to

disengage

t h

e 7

Α

17

T

h

e

from

t

h

e

oscilloscope

.

Te

k

t r

onix

7000-se

r

ies

oscillosco

p

es

.

T

h

is

plug-in

pr

ovi

d

es

50-oh

m,

50-

m

illivolt/

d

ivision

access to

eit

he

rt

he ve

r

tical



Controls

and

Connectors

o

r

ho

r

izo

n

tal

d

eflection

syste

m

i

n

t

he

mainframe

.

It

also

p

rovi

d

es

i

n

te

r

facing

to

t

he

mai

nf

ra

m

e

p

owe

r s

upp

lies,



P

OSITIO

N



P

ositions

the d

is

p

lay

.

rea

d ou

t

en

co

d

ing

ci r

cuits,

an

d

oth

er

f

un

ctions th

at

allow

cu

stom

circ

u

it

d

esig

n to

m

eet

specific

n

eed

s

.

E

lect

r

ical

C

h

aracteristics

Deflection F

acto

r

:

50

mill

ivolts/

d

ivisio

n

wit

h

Gain

a

dju

ste

d

inter

n

ally

.

Freq

ue

ncy

R

es

po

n

se

(

M

ainf

r

a

m

e

depe

nd

ent)

:

7400

-

50

mega

h

ertz

;

7500

-

75

mega

h

ertz

;

7700

-

150

m

ega

h

e

r

tz

;

7900

-

greater

t

han

150

m

ega

h

ertz

.

T

h

is

plug-in

h

as

αb

asic

d

eflectio

n facto

r

of

50

I

npu

t

Im

pe

d

a

nce

:



mV

/d

iv

w

h

en

t

he

i

n

te

rn

al

Gai n

co

n

trol

is

p

rope

r

ly

a

dju

ste

d

.

G

r

eate

r

than

10

m

V

/

d

iv

at

reduced

b

a

ndwi

d

t

h

50

o

hm

s

p

l

u

s

o

r

min

u

s

10%

.



m

ay

b

e

ach

ieve

d

by adju

sti

ng

t

he

Gain

control

.

Ot

her

d

eflection

facto

r

s

may

be ac

h

ieve

d b

y

u

sing

the

sol

der

pad

s

p

r

ovi

ded

in

t h

e

plug-in,

an

d

cu

stom-

d

esigni

n

g

t

h

e

P

OSITIO

N

R

a

nge

:



ci r

cu

it

.

Refer to

t h

e

A

pp

licatio

n

s

section for

s

uggestions

.

At

least

+10

d

ivisions

to

at

least

-10

divisio

n

s

fro

m

gratic

u

le

cen

te

r .

T

he 7

Α

17

is

not

factory

eq

ui

pp

ed

wit

h

r

eadou

t

.

M

axi

mu

m

I

n

p

u

t

V

oltage

:



H

owever,

access

is

provided so

t

h

at

rea

d

ou

t

e

n

co

ding

5

volts

RM

S



r

esisto

r

s

can

b

e

connecte

d

.

R

efe

r

to

t

h

e

A

pp

lications

section for

s

u

ggestio

n

s .

En

viro

nmental

C

h

a

r

acteristics

R

efe

r

to the

7000-se

r

ies

oscilloscope

mainfra

m

e

m

a

nu

al

.

OPER

ATI

N

G

I

N

ST

RU

CTIO

N

S

I

NPU

T

BN

C

co

nn

ecto

r

p

rovi

d

es

α

m

ea

n

s

for

conn

ecting

α

sig

n

al

.

Inp

u

t

Coupling

T

he 7

Α

17

I

NPU

T

is

d

i

r

ectly

coup

led

i

nto α

50-o

h

m

impe

d

ance

.

H

oweve

r

,

t

h

e

i

npu

t

may b

e

d

esig

ned to

acce

p

t

any

type

of

signal

.

R

efer to

t

he

Applicatio

n

s

section fo

r s

uggestions

.

Deflection

F

actor

R

ea

dou

t

En

cod

i

ng

P

olarity

T

he p

olarity

of

t

he

dis

p

laye

d

sig

n

al

may

be

inverte

d

by

moving

the

st

r

ap

s

from

+

UP

(as

m

ar

k

e

d

on

t

h

e

ci r c

u

it

board

)

to

t

he

solde

r

p

a

d

s

m

a

rk

ed

I

NV

.

CI

R

C

U

IT

O

PER

ATIO

N

7

Α

17

Ge

n

e

r

al



Th

e

sig

n

al

a

pp

lie

d to the

I

NPU

T

con

necto

r is

d

irect

T

he 7

Α

17 operates with

any

7000-se

r

ies

oscillosco

p

e



cou

p

le

d to pa

r

a

ph

ase

am

p

lifier

0110,

Q210

.

P

ositio

n

i

ng

and

is

r

ea

dy

for

u

se as

it is

r

eceive

d

.

It

can

be

installe

d

is

achieved

b

y

varying

th

e

DC

level

at

the base of

in

any

co

m

pa

r

tment

of

t

h

e

7000-se

r

ies

oscilloscope

.

To



Q210

.

Gain

of the p

ara

ph

ase

amp

lifier

(Q110,

Q210)

is

7

Α

17

set

to

a

pp

roxi

m

ately

one by

R

211

.

P

ola

r

ity

of

t

h

e



Special

P

arts

.

In

a

d

ition

to

t

h

e

sta

n

dard

electro

n

ic

d

is

p

laye

d

sig

nal

may

be

inverte

d

b

y

movi

n

g t

h

e s

h

orting



com

ponen

ts,

so

m

e

s

p

ecial

p

arts

a

r

e

u

sed

in

t

h

e

7

Α

17

.

stra

p

s

to

t

h

e

I

NV

p

ositio

n

.

T

he

out

pu

t

of

t

h

e

p

ara

ph

ase



T

hese pa

r

ts

a

r e

man

u

fact

ur

e

d

o

r

selected

by Te

k

tronix,

amplifie

r

is

co

n

necte

dto

common

emitter d

iffere

n

tial



I

nc

. i

n

accor

d

ance

wit

h our

specifications

.

T

hese

s

p

ecial

a

mp

lifie

r

Q125,

0225

and

co

m

mon

b

ase d

iffe

r

e

n

tial



pa

rts

are

in

d

icate

d

in

t

hep

arts

list

b

y

an

aste

ris

k

am

p

lifie

r

Q120,

Q220

.

T

h

ese

a

mp

lifiers

pr

ovide

tr

igge

r



pr

eceding

t

hep

ar

t

n

u

m

b

er

.

Or

d

er

all s

p

ecial

p

arts

output

a

n

d

signal

o

utpu

ts

to the

oscillosco

p

e

m

ai n

fra

m

e



d

irectly

fr

o

m

yo

ur

local

Te

k

t

r

onix

F

iel

dOffice or

via

t

he

i

n

terface

con

n

ecto

r

s

.



re

p

resentative

.

M

AI

N

T

EN

A

N

C

E

Or

de

r

ing Pa

r

ts

.

Wh

en

or

d

eri

ng

re

p

lace

m

en

t

p

arts

fr

o

m

Ge

neral



Te

k

tr

on

ix,

I

nc

.,

incl

ude

t

h

e

instr

u

mentTy

p

e,

instr

u

ment

s

p

o

r

tion

of

t

h

e

manual

contain

s

info

rmation



Serial

Numb

er,

αdesc

r

i

ption of

t

he pa

r

t (if

elect

r

ical,

This include

circuit

number),

and

t

he

Te

ktronix

P

art

co

nce

r

ning preven

tive

m

ainte

nan

ce,

corrective

mai

n

-

Nu

mb

er

.

te

n

a

n

ce,

and

tr

oub

les

hooting

t

he 7

Α

17

.

Fu

rt

he

r

i

nfo

r

ma-

tio

n

relati

ng

to

gene

r

al

m

ai

n

tena

nce can be found

i

n

t

h

e

7000-se

r

ies

i

n

str

u

ction

ma

n

ual

.



Solde

r

ing

Tec

hn

i

ques

.

Ca

re s

h

o

u

l

d

b

e

ta

k

e

n

w

h

e

n

sol

d

eri

ng to p

reve

n

t

d

a

m

age

due

to excess

h

eat

.

Α

s

m

all

wattage

sol

d

er

ing

iron

(15 to

50

watts)

s

h

ould

be

used

.

Clean

i

ng



Apply

h

eat

d

irectly

to

t

h

e

j

unction to be

sol

de

re

d

.

U

se

To

im

pr

ove

r

elia

b

ility

and to

avoi

d p

ossi

b

le t

h

ermal



only

eno

ugh heat to

form

α

goo

d b

on

d

.

H

eat

sin

k

a

n

d

elect

r

ical

pr

ob

lems,

it is

reco

mm

ended

t

hat th

e



co

mp

o

nen

ts

w

h

en n

ecessa

r

y

.

7

Α

17

be

cleaned

at

pe

r

io

d

ic

intervals,

as well

as

b

efo

re

cali

b

ration

.



R

ep

ac

k

aging

for

S

h

ipme

nt

L

oose

du

st

may

b

e

re

m

ove

d

wit

h

α

soft

clothor

α

dry

br

ush

.

H

ar

d

en

e

d

irt

may

be

re

m

oved

wit

h

α

cotton-ti

pped

swa

b

or

cloth

,

d

am

pened

w

it

hα

m

il

d

ete

r

gentand

water

sol

u

tio

n

,

t

henca

r

ef

u

lly

r

inse

d

and

dr

ied

.

Troubles

h

ooting

Seve

r

al t r

oub

les

h

ooting

ai

d

s

for

t

he 7

Α

17 a

r

e given

on

o

n

e

fol

d

out

p

age

locate

d

at

t

he

rear

of

t

he

manual

.

Th

is

page

incl

ud

es

:

Sc

he

m

atic

d

iag

r

a

m

s, s

h

owi

ngim

p

or-

tant

voltages,

co

mp

o

ne

nt

val

u

es,

and

circuit

n

u

m

be

rs

;

b

oard

p

ict

ur

es

s

h

owing

ph

ysical

locatio

ns of

t

h

e

co

mp

on

e

n

ts

;

an

d

semicon

ductor

basi

ng d

iagra

m

s

.

F

or

b

est

results,

u

se

t

hese

ai

d

s

in

con

jun

ction

wit

h

t

he

Ci

r

cuit

Operation

a

nd

Cali

b

ratio

n p

rocedu

re

.

R

efer

to

t

he 7000-series

mainf

r

ame

m

an

ual

fo

r

gen

eral

troub

les

h

ooti

n

g

info

rm

atio

n

.

(i .e

.

se

m

ico

nductor

care,

colo

r

cod

i

n

g,

etc

.)

.

If

th

e

Te

ktro

n

ix inst

rum

ent

is

to

be

s

h

i

pped

to

α

Te

k

tr

on

ix

Se

r

vice

Center

for

service

or

repair,

attach

α

tag

s

h

owing

:

ow

ne

r

(wit

h

a

dd

r

ess)

a

nd

t

he

na

m

e of an

i

nd

ivi

d

ual

at

yo

ur

firm

t

h

at

can be

contacted,

comp

lete

instr

u

me

nt

serial

nu

m

b

e

r

and

α

d

escri

p

tio

nof

t

he

service

requ

ire

d

.

Save

and

r

e-

u

se

th

e

pac

kage

in

w

h

ic

h

yo

u

r

instr

u

ment

was

s

h

i

pped

.

If t

he

original

pack

aging

is

un

fit

fo

r u

se

o

r

not

availa

b

le,

re

p

ackage

th

e

inst

r

u

m

ent

as

follows

:

T

he ca

r

ton

test

stre

n

gt

h

fo

r

yo

ur

i

n

st

ru

me

n

t

is

200

po

und

s

.

Gain

Su

rro

und

t

h

e

instr

um

ent

with polyeth

yle

ne

sh

eeti

ng to

protect

t

he

finis

hof

t

he

instr

u

ment

.

O

b

tain

α

carto

nof

cor

ru

gate

dca

rd

boar

d

of

the co

rr

ect ca

r

ton

stre

n

gt

h

and

having

insi

d

e

d

i

m

ensions

of

no

less

than

six

i

nch

es

m

o

r

e

t

han

t

h

e

instr

u

ment

d

imensio

n

s

.

C

u

s

hion

t

h

e

instrument

b

y

tig

h

tly

p

ac

k

i

ng

t

hree

i

nch

es

of

dun

nage

o

r

ureth

ane

foam

between

carto

n

an

d

i

n

str

um

e

nt,

on

all

si

des

.

Seal

ca

r

ton with

s

h

i

pp

i

ng

tape

o

r

i

ndu

st

r

ial

staple

r

.

CA

L

I

BR

ATIO

N

Co

rr

ective

M

aintenance

Install

t

he 7

Α

17

in

any

7000-se

r

ies

oscillosco

pe

m

ai

n

-

Stan

d

ard

R

e

p

lace

m

ent

Pa

r

ts

.

All

electrical

a

nd



f

r

ame

.

Apply

α

1

kH

z,

0

.4

volt

s

q

uare-wave

fro

m

t

h

e

m

ech

a

n

ical

r

eplacement

parts

fo

r

t

h

e 7

Α

17 can b

e



oscillosco

p

e

CA

L

I

BR

ATO

R

.

Ce

n

te

r

t

hed

isplay

a

nd

obtai

ned

t

hr

ough

yo

ur

local

fiel

d

office

or

represen-



a

dj

ust

t

he

Gain

potentio

m

eter

(locate

d

on

th

e

circ

u

it

tative

.

H

oweve

r

,

m

a

ny of

t

he

electronic

p

arts

can

be



b

oa

r

d

)

for

α

d

is

p

lay

of

eig

h

t

divisio

n

s

.

ob

tai

ned

locally

i

n

less

ti

m

e t

h

a

n

is

req

u

i

re

dto or

d

er

t

h

em

fr

om

Te

k

tro

n

ix,

Inc

.

Before purch

asi

ng or

ordering



NOTE

re

p

lace

m

e

n

t

p

arts,

check

t

he pa

r

ts

list

for

val

u

e,

rating,



O

b

se

r

ve

p

r

o

per

termination

of

CAL

I

BR

ATO

R

ou

t

put

tole

r

ance,

a

nd

d

escri

p

tio

n

.



w

h

en

applying

voltage

to

t

h

e

7A1750

Ω

input

.

REV

.

C,

OCT

.

1977

Α

PPL

I

CA

TIO

N

S

Gene

r

al



TA

BLE

1

T

his

section

p

rovi

d

es

s

uggestion

s

for

possi

b

le

mo

d

i-



P

O

WER

S

UPPL

Y L

OAD

L

I

M

ITS

fications

to

t

h

e 7

Α

17

.

Th

e

7

Α

17

may

b

e

m

o

d

ifie

dto

s

u

it

αpa

r

tic

u

lar

n

ee

d

b

y

u

sing

t

he

areas

p

rovi

d

edfor



S

upp

ly

V

olts



*

M

axim

u

m

Limit

circuit

con

struction

.

P

ower

s

upp

ly

a

nd

r

ea

dou

t

connec-

tions

are rea

d

ily

availa

b

le

;

see

F

ig

.

2

for

t

h

eir

locations

.



+5

V



500

mA

T

he

fro

n

t

su

b

-

p

a

n

el

of

t

h

e

7

Α

17

is

p

r

e-

pu

nchedwith

+15

V



500

mA

various

size

and

s

h

a

p

e

h

oles

to

allow easy

m

oun

ti

ng of



-15V



500

m

A

switc

h

es,

indicators,

etc

.



+50

V



100

mA

-50

V



100

m

A

7

Α

17

P

ower

s

u

pply

limitations

are given

in

Ta

b

le

1 . Ι

2

ί

5

recom

m

en

d

e

d

t

h

at

ci rc

u

it r

y

added

to

t

h

e

7

Α

17 not



*These

maximums

cannot

occur

simultaneously!

T

he

total

p

ower

exceed

these

limitations

.



d

issipation

must

not

excee

d

-

16 .5

watts

.

GAI

N

AD

J

F

ig

.

2

.

7

Α

17 s

h

owing

areas

for

circuit

construction

and p

re- p

unched

front

sub-panel

.

7

Α

17

H

IG

H

IMPE

DA

N

C

E

A

MPL

I

F

I

ER



R

5



390

Ω



1/4

W



5%

R

6



910

92



1/4

W



5%

T

h

is fiel

d effect

t r

an

sisto

r

(

FE

T) a

mp

lifier

can

b

e



R7



21

Ω



1/8

W



1%

co

nn

ecte

d to the

in

pu

t

of

t

he 7

Α

17 to

i

ncrease th

e



R

8



1

ΜΩ



1/4

W



10%

sta

b

ility

and

r

aise

t h

e

i

np

ut

i

mp

e

dance

f r

om

50

o

h

ms

to



R9



21

Ω



1/8

W



1%

over

one

mego

h

m

depending

on

t

he value of R

1

.

(It

is



R

10



910

Ω



1/4

W



5%

not

r

eco

mm

en

d

e

d

t

h

at

R

1

excee

d

five

or ten

mego

hm

s



R

11



390

Ω



1/4

W



5%

du

e to p

ote

n

tial

lea

k

age pr

ob

le

ms

.)

T

he op

tional limite

r ci r

cuit,

co

n

sisti n

g of

C

R

1

αand

C

R

i

b,

s

hou

l

d be u

sed

w

h

en

t

h

ere

is

α

p

ossibility

of

exceeding

±15

volts

at

the

i

np

ut of the

FET

a

mp

lifie

r

.

T

h

is

circ

u

it

will avoi

d

p

ossi

b

le

d

amage

to

t

h

e

FE

T

.

Atte

n

uato

r

s

m

ay

b

e

a

dd

e

d

to th

is

amplifier

circ

u

it

fo

r

t

he pu rpose

of

ob

taini

n

g

αd

esi

r

ed d

eflection

facto

r

,

r

efe

r

Q

1α-

Q

1

b

to

t

h

e a

pp

licatio

nfor "atte

nu

ators"

.

P

a

r

ts

L

ist

:

*

R

1



1

ΜΩ



1/4

W



1/2%

R

2



470

Κ

92



1/4

W



10%

R3



560

Ω



1/4

W



5%

R

4



47

2



1/4

W



10%

*

M

ay

be

selecte

d to

suit

in

pu

t

imped

ance

re

q

uirements

.



*'O

p

tional

I

NPU

T

R

1

Μ

-15

V



+15

V



+15

V

op

tional

Ι



Ι

`~

D1A



D1

B



R

5

ει



L

-

t

Ι



QlA



ς

3

Τ

R

2



Ι



R4

Fig

.

3

.

FE

T

Amp

lifier

.

REV

.

FEB

1974

Ci



.005

μ

F



ce

r



20%



500

V

C2



1

.8

pF



ce

r



20%



500

V

C3



22

μF

elect



20%



15

V

C4



.001

μ

F



ce

r



20%



500

V

C5



22

μ

F

elect



20%



15

V

**D1

a

-D1b



D

u

al

d

io

d

e

F

SA1480

availa

b

le

from Te

k

t r

on

ix,

Inc

.,

o

rd

e r

pa

r

t

nu

m

be

r

152-0321-00

.

Ν

channel

D

u

al

F

ΕΤ 2Ν

4416

a

v

aila

b

le

fro

m

Te

k

tro

n

ix,

Inc

.,

or

d

e

r

p

a

r

t

nu

m

b

er

151-1031-00

.

R

7

C5

R6

910

To

7

Α

17

in

put

R

10

ATT

ENU

ATO

R

S

(

U

se

wit

h

FE

T

Am

p

lifier)

In

so

m

e

cases

w

h

ere

the

sensitivity

of

the 7

Α

17

is

too

great,

atte

nuato

r s

of

t

h

e

ty

pe

s

h

own

in

F

ig

.

4

m

ay

be

a

dd

e

d

.

T

h

ese

are

h

ig

h imped

ance

attenuators

and

s

hou

l

d

be u

se

d with α

h

ig

h

i

npu

t

i

mp

e

d

a

nce

am

p

lifier,

r

efe

r

to

t

he

FET

A

mp

lifier

in t

h

is

sectio

n

.

C2

is

αva

r

iable

capacito

r

u

sed

to

n

o

rm

alize

th

e

Input to app

roximately

10

pF

.

F

or

t

h

ese

calculations,

C2

is

ass

u

me

d to b

e

10

pF

.

R

Σ

et

-

R2'

Ct =

13

2

,

C

2

Rt

I

NPU

T

ν

;

F

ig

.

4

.

H

ig

h F

re

q

uency

Attenuators

.

Exam

p

le

:

Α

d

eflection

factor of

200

m

V

/

d

iv

with

R

i

n =

1

m

ego

hm

is

d

esi

r

ed

.

T

h

e

FET

a

mp

lifier

has

an

input

r

esista

n

ce

=

1

mego

h

m

= R

fet

50

m

V

/

d

iv

Vr

_

-Vo/V,



200



= 0.25

mV

/D

ίν

R

2'

=

1

m

ego

hm

Χ

0

.25

=

250

k

ilo

h

m

RI

=

1

m

ego

hm

-250

k

ilo

hm

=

750

k

ilo

h

m

R

2-

250

k

ilo

hm

Χ

1

m

ego

hm

=

333

k

ί1

ο

h

m

1

m

ego

h

m

-250

k

ilo

h

m

F

or

mu

las

:

Attenuatio

n



_

R

atio

V

r

=

V

ο

/

V

i



250

k

ilo

h

m

Χ

10

p

icofarads

C1



750

k

ilo

hm

=

3

.3

p

icofara

d

s

R

fet

--

i

np

ut r

esista

n

ce of

t

he

amplifie

r

.

R

i

n

= d

esi

r e

d

i

npu

t

resistance

at

t

h

e

I

NPU

T

connector

.

N

or

m

alizing



Con

nect α

1

kH

z squa

r

e

wave

R

2'

=

R

i

n

Χ

V

r

R

2

p

arallele

d with

R

f

et



fro

m



t

h

e



oscilloscope

CA

L

I-

BR

ATO

R

.

A

d

ju st

t

he outpu

t

of

Rt

-

R

in

-

R

2'



t

h

e

CA

L

I

BR

ATO

R

for αd

is

p

lay

of four to

six

ve

r

tical

d

ivisio

ns

.

R



Ad

ju

st

C2

for

s

quare

lea

d

ing

edge

2

=

R

2'

R

Σ

et



a

nd

flat

top

.

Gain



R

eadju

st,

if

necessary,

t

h

e

7

Α

17

Gain

co

n

trol

fo

r

pr

ope

r

sensi-

tivity

.

To

FE

T

Am

p

lifier

7

Α

17

7

Α

17

RE

ADO

U

T



Each

word

locatio

n h

as

its

own

r

ow

and

col

um

n

return

lines

.

The

top

word

locations

have α

row

return

E

achof

t

he

oscillosco

p

es

fou

r

p

l

u

g-i

n

com

pa

r

tments



line

locate

datΒ

37

of

t

h

e

p

l

u

g-in inte

r

face

connecto

r

are

allotte

d

two

wo

rd

locatio

ns located

at

t

h

e

to

p

and



and

α

col

umn

r

eturn

li

ne located at

Α

37

.

Th

e

botto

m

b

otto

m

of

th

e

C

R

T

sc

r

een

(see

F

ig

.

5)

.

E

ach

wo

rd

word

locatio

n

s

have

αr

ow

ret

u

rn line at

Β38

a

nd α

locatio

n

can b

e

enco

d

e

dto write

up

to

te

nch

ar

acte

rs

.



colu

mn

ret

u

rn

li

n

e

at

Α

38

.

For

each

of the ten

s

paces

available

in

α

word

location

t

her

e is α

co

rr

es

p

on

d

i

ng

ti

m

eslot

(TS) pu

lse

.

T

he time-

slot

pu

lses

inter

r

ogate

t

h

e

readou

t e

ncoding r

esisto

rs

in



T

h

e

ti

m

eslot

pu

lses

are

always

-15

volts

in

ampli-

t

he

pl

u

g-i

n

s

.

T

her

es

u

lting

info

rmation

is

ret

urnedto

t

he



tu

de

.

T

h

erefore

t

h

e

cu

rre

n

t

flowing

fr

o

m

t

h

e ti

m

eslot

oscillosco

p

e read

out

system

as

vario

u

s

row

an

d

col

u

m

n

lines

t

hr

o

ugh

t

he p

l

u

g-i

nencoding

resistors

into

t

h

e

row

cu

rre

n

ts

.

T

h

ese

r

ow

a

nd

col

umn

cu

rr

en

ts select

t

he



a

nd

column

ret

urn

lines

is

α

d

irect

resu

lt

of

t

he value

ch

aracte

rs

or ope

r

atio

n

sfr

o

m

t

he

m

at

r

ix

s

h

own

i

n F

ig

.



of

t

h

e

en

co

d

ing

resisto

rs

as

give

n by

O

hm

's

law

.

For

7

.

Fo

r

exa

mp

le

:

to ob

tai

n

t

he

letter

"

Α

"

t

he

r

e

mu

st

b

e



exa

mp

le

:

In

o

r

de

r

to

p

lace

th

e

letter

"

Α

" at timeslot

0

.4

mA

of

row

cu

rrent

a

nd

0

.3

mA

of

col

umn

c

urr

e

n

t

.



location

3 of

t

he top

word

locatio

n

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Tektronix 7A17 Manuel utilisateur

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