Tektronix S-4 Manual de usuario

INNSTRUCTION

MAN

UAL

Serial

Number

Tektronix,

Inc.

S.W.

Millikan

Way

©.

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables:

Tektronix

070-0896-00

169

en.

—

_—

—

Type

S-4

CONTENTS

Section

Specification

Section

Operating

Instructions

Section

Circuit

Description

Section

Maintenance

Section

Performance

Check/Calibration

Abbreviations

and

Symbols

Parts

Ordering

Information

Section

Electrical

Parts

List

Mechanical

Parts

List

Information

Section

Mechanical

Parts

List

Section

Diagrams

Mechanical

Parts

List

Illustrations

Accessories

Abbreviations

and

symbols

|used

this

manual

are

based

taken

directly

from

IEEE

Stand-

ard

260

‘Standard

Symbols

for

Units,’’

MIL-STD-

12B

and_other

standards

the

electronics

in-

dustry.

the

rear-ofthe-manuat

Cha

nge

information,|

any,

located

Type

S-4

fal

Lae

Type

5S-4

SECTION

TYPE

S-4

SPECIFICATION

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual.

General

Information

The

Type

S-4

Sampling

Head

input

signal

processing

unit

for

Tektronix

sampling

units

such

the

Type

352,

355,

and

386.

Input

characteristics

the

sampling

system

are

determined

the

Type

S-4.

The

Type

S-4

has

input

im-

pedance

500

and

risetime

less.

The

Type

S-4

can

installed

directly

into

sampling

unit

used

remotely

(with

the

Type

3S2

Type

355)

optional

foot

extender

cable.

When

used

with

Type

356

Sampling

Unit

the

Type

S-4

plugged

into

the

dual-input

extender

cable

supplied

with

the

Type

356.

portion

the

signal

delivered

the

sampling

head

input

coaxially

coupled

the

sampling

unit

for

use

internal

trigger

signal.

The

Type

382

allows

selection

the

trigger

pickoff

signal

from

the

Channel

sampling

head.

Type

385

and

356

Sampling

Units

permit

use

the

trigger

pickoff

signal

only

from

Channel

Use

this

trigger pickoff

signal

dependent

upon

the

type

sampling

unit

and

sampling

sweep

unit

used

the

system.

See

the

instruction

manual

for

your

sampling

unit

and

sampling

sweep

unit

for

further

information.

Vertical

deflection

factor

the

sampling

system

label-

the

top

the

Type

S-4

mVOLTS/DIV;

the

label

refers

the

sampling

unit

Units/Div

switch

the

corre-

sponding

channel.

Digital

Unit

Programming

Connections

The

Type

S-4

has

two

contacts

its

rear

connector

that

program

the

decimal

and

units-of-measure

lamps

Tek-

tronix

Type

6RI1A

Type

230

Digital

Unit.

These

connections

are

not

used

with

Type

382

Sampling

Unit.

When

using

Type

355

Type

386,

one

the

sampling

head

contacts

notifies

the

digital

readout

unit,

through

the

sampling

unit

digital

control

circuits,

that

the

Type

S-4

voltage

meas-

uring

head.

This

causes

the

Volts

lamp

the

digital

readout

unit

light.

The

other

sampling

head

contact

notifies

the

digital

readout

unit,

through

the

sampling

unit

digital

control

circuits,

that

the

Type

$-4

sensitivity

requires

decimal

shift

the

numbers

around

the

sampling

unit

Units/Div

switch.

ELECTRICAL

CHARACTERISTICS

Characteristics

The

following

characteristics

apply

over

ambient

tem-

perature

range

0°C

+50°C

and

after

five

minute

warmup

providing

the

instrument

was

calibrated

tem-

perature

between

+20°C

and

+30°C.

Characteristics

listed

below

apply

only

after

the

Type

S-4

has

been

properly

mated

the

sampling

unit

and

indicator

oscilloscope

and

after

these

units

have

been

given

sufficient

warmup

time.

determine

the

particular

system

warmup

requirements,

refer

the

amplifier

and

indicator

oscilloscope

instruction

manual.

procedure

for

mating

the

Type

S-4

the

sampling

unit

can

found

the

Operating

Instructions

section

this

manual

ELECTRICAL

CHARACTERISTICS

Performance

Requirement

50Q

within

Characteristic

Input

Resistance

Response

Step

Signals

Risetime

(10%

less

(Verify

using

step

90%)

Section

5.)

Pulse

Flatness

Devi-

ation

(after

90%

point

display}

Ops

400

—10%

+10%

with

total

20%

less.

(Verify

using

step

10,

Section

5).

+10%

with

total

10%

less.

(Verify

using

step

10,

Sec-

tion

5).

—2%

+2%

with

total

less.

(Verify

using

step

10,

Sec-

tion

5).

400

Maximum

Operating

P-P

Signal

Voltage

Safe

Overload

Signal

Not

exceed

—5V

(DC

Voltage

plus

peak}

Adjustable

the

sampling

unit

unity

for

signals

500

P-P;

when

the

loop

gain

adjusted

unity

with

positive

input

signals,

the

loop

gain

will

within

unity

with

negative

input

sig-

nals

and

vice

versa.

Loop

Gain

Baseline

Shift

(with

less,

30Hz

50kHz

change

repetition

rate)

5mV

fess,

measured

tangen-

tially

Displayed

Noise

ENVIRONMENTAL

CHARACTERISTICS

Storage

Operating

Temperature—As

stated

above

Electrical

Character-

istics

table

Temperature—

—40°C

+65°C

Altitude—To

50,000

feet

Altitude—To

15,000

feet

1-1

Specification—Type

5-4

MECHANICAL

CHARACTERISTICS

Dimensions—

Height

inches

Width

1%,

inches

Length

4%,

inches

Construction—

Epoxy

laminated

circuit

boards.

Aluminum

Accessories—

wrap

around

cabinet

with

aluminum

casting

front

and

rear.

Anodized aluminum

front

panel.

illustrated

list

the

accessories

supplied

with

the

Type

S-4

the

end

the

Me-

chanical

Parts

List

pullout

pages.

Type

S-4

SECTION

OPERATING

INSTRUCTIONS

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual.

General

Information

This

section

provides

the

basic

information

required

for

operation

the

Type

S-4

Sampling

Head,

including

installa-

tion

and

First

Time

Operation.

The

Type

S-4

can

used

extender

cable

without

compromising

the

response

the

measurement

system.

Sig-

nals

are

applied

the

input

the

sampling

head

through

a 3

mm,

coaxial

connector

located

the

cen-

ter

the

front

panel.

Unity

loop

gain

can

obtained

with

input

signals

0.5

volt

(peak-to-peak).

Unity

loop

gain

ensures

the

most

accurate

displays,

particular

importance

during

fast

changes

input

signal

amplitude.

See

the

Basic

Sampling

Principals

Section

your

sampling

unit

manual

for

further

information.

The

Type

S-4

may

used

with

input

signals

volt

(peak-to-peak).

Specifications

for

the

Type

S-4

Sampling

Head

are

given

Section

this

manual.

NOTE

Attenuators,

with

threaded

connectors,

are

available

optional

accessories.

These

attenua-

tors

are

useful

reducing

the

amplitude

large

signals.

Other

optional

accessories

with

3mm

connectors

include

coaxial

cables,

termi-

nation,

and

adapters

for

interconnecting

various

types

connectors.

Refer

your

Tektronix

cata-

log

contact

your

local

Tektronix

Field

Engineer

Representative

for

further

information

about

optional

accessories.

Installing

the

Type

S-4

Sampling

Head

Fig.

2-1

shows

the

Type

S-4

partially

installed

Type

352

Sampling

Unit

with

Type

564

Oscilloscope

and

Type

3T2

Random

Sampling

Sweep

unit.

The

sampling

head

(or

heads)

can

plugged

into

the

sampling

unit

shown,

used

remotely

special

extender

cable.

Three and

six

foot

extender

cables

are

available.

Order

the

three

foot

extender

cable

Tektronix

Part

No.

012-0124-00,

the

six

foot

extender

cable

Tektronix

Part

No.

012-0125-00.

Con-

tact

your

local

Tektronix

Field

Engineer

Representative

for

price

and

availability

these

optional

accessories.

insert

the

Type

S-4

into

compartment

the

sampling

unit,

proceed

follows:

Pull

the

latch

knob

(Fig.

2-1)

outward

from

the

front

panel

(the

latch

knob

will

push

out

normally

when

the

unit

inserted

the

knob

left

free

move).

Insert

the

Type

S-4

slowly

into

the

compartment,

the

two

plastic

guides

the

compartment

engage

the

S-4.

Fig.

2-1.

Inserting

the

Type

S-4

Sampling

Head

the

sampling

unit.

Push

the

Type

S-4

completely

into

the

compartment.

Push

the

latch

knob

lock

the

Type

S-4

place.

remove

the

Type

S-4

from

the

compartment,

pull

the

latch

knob

away

from

the

front

panel,

then

pull

the

unit

from

the

compartment.

use

the

Type

S-4

extender

cable,

install

follows:

Pull

the

latch

knob

located

the

head

end

the ex-

tender

cable

outward

from

the

panel

(the

latch

knob

will

push

out

normally

when

the

extender

inserted

the

knob

free

move).

Insert

the

extender

cable

head

end

slowly

into

the

de-

sired

compartment

the

sampling

unit

the

two

plastic

guides

the

compartment

engage

the

unit.

Push

the

head

completely

into

the

compartment.

Push

the

latch

knob

lock

the

extender

cable

head

end

place.

Connect

the

Type

S-4

the

other

end

the

extender

cable

similar

manner,

and

set

the

latch

knob

hold

place.

2-1

Operating

Instructions—Type

S-4

remove

the

Type

S-4

from

the

extender

cable,

pull

the

latch

knob

the

front

panel

the

Type

S-4,

and

re-

move

the

unit

from

the

extender

cable.

remove

the

extender

cable

head

from

the

sampling

unit

compartment,

pull

the

latch

knob

otuward

from

the

front

the

panel,

then

pull

the

unit

free.

Mating

The

vertical

deflection

factor

and

the

sampling

system

loop

balance

(adjusted

the

Gate

Bal

control)

should

adjusted

when

mating

Type

S-4

sampling

unit.

The

mVOLTS/DIV

label

the

Type

S-4

names

the

deflec-

tion

factor

units

the

sampling

unit

Units/Div

switch.

For

example,

with

the

Type

S-4

installed

Type

382

and

the

Units/Div

switch

set

100,

each

major

division

CRT

de-

flection

corresponds

100

millivolts

input

signal

(when

the

Variable

control

the

Cal

position).

The

deflection

factor

mated

the

indicator

oscilloscope

CRT

adjust-

ing

the

sampling

unit

Gain

control.

Refer

the

sampling

unit

manual

for

its

Gain

adjustment.

The

Gate

Balance

adjustment

the

Type

S-4

not

great-

affected

when

the

sampling

head

changed

from

one

sampling

unit

another,

operated

on an

extender

cable.

However,

for

precise

offset

measurements,

the

Gate

Balance

control

must

readjusted

whenever

such

relo-

cation

made.

Location

the

control

and

details

its

adjustment

are

given

below

under

the

heading

First

Time

Operation.

FIRST

TIME

OPERATION

addition

the

Type

S-4,

this

procedure

utilizes

Type

S-50

Pulse

Generator,

Type

3S2

Dual-Trace

Sampling

Unit,

Type

312

Random

Sampling

Sweep,

and

Type

564

Storage

Trigger

input

2ns

Flexible

3mm

coaxial

cable

Trigger

cable

Fig.

2-2.

Equipment

setup

used

during

First-Time

Operation.

2-2

Oscilloscope.

See

Fig.

2-2.

The

Type

3T2

Random

Sampling

Sweep

permits

viewing

the

signal

advance

the

trigger-

ing

event.

Such

sampling

sweep

trigger

lead-time

required

when

using

the

Type

S-4

with

the

Type

3S2

for

viewing

fast

pulses

without

pretrigger.

The

built-in

pretrigger

circuit

the

Type

S-50

permits

sequential

sampling

units,

such

the

Type

375

Type

3T6,

operate

their

faster

sweep

rates.

Setup

Information

With

the

Type

564

Power

switch

off,

insert

Tektronix

Type

352

Sampling

Unit

into

the

vertical

channel

compart-

ment

(left)

and

Tektronix

Type

3T2

Random

Sampling

Sweep

unit

into

the

horizontal

channel

compartment.

Insert

the

Type

S-4

into

the

Channel

compartment

(left)

the

Type

352

leaving

the

latch

knob

free

move.

Once

the S-4

seated,

push

the

latch

lock

place.

Insert

the

Type

S-50

into

the

Channel

compartment

(right)

the

Type

3S2

leaving

the

latch

knob

free

move.

Once

the

S-50

seated,

push

the

latch

lock

place.

Connect

the

Type

S-50

output

connector

the

Type

S-4

input

connector

using

section

flexible

coaxial

line.

See

cable

bending

limits

discussed

under

Cable

and

acces-

sory

Considerations

later

this

section.

NOTE

Connectors

both

ends

the

coaxial

cable

should

firmly

connected

mating

connectors

accessories.

Tighten

slightly

than

finger

tight

using

°/15

inch

wrench.

good

connection

necessary

minimize

reflections

the

junction

connectors.

Connect

Pretrigger

Out

the

Type

S-50

the

Trigger

Input

the

Type

372.

Set

the

Intensity

control

the

Type

564

fully

counter-

clockwise.

Connect

the

Type

564

the

power

line

and

set

the

Power

switch

On.

Allow

about

minutes

warmup

the

units

reach

oper-

ating

temperature

before

proceeding.

Set

instrument

controls

follows:

TYPE

352

Display

Mode

CHA

Normal-Smooth

Normal

Horiz

Compatibility

Sw.

Sampling

Channel

controls

Position

Midrange

Offset

Midrange

turns

from

one

end)

Units

/Div

200

Variable

Cal

Invert

Push

Dot

Response

Midrange

Operating

Instructions—Type

S-4

TYPE

372

Time

Position

Midrange

Horiz

Position

Midrange

Samples/Div

o'clock

position

Samples/Div

Variable

Display

Mode

Normal

Start

Point

Before

Trigger

Sweep

Rate

100

ns/Div

Range

Dsiplay

Mag

+Frys

Time

Magnifier x1

portion

Variable

Cal

‘poe

| |

Trigger

Source

Ext

Trig.

Sensitivity

Fully

clockwise

TYPE

564

Astigmatism

Midrange

Focus

Midrange

Intensity

Fully

counterclockwise

Upper

and

Lower

Screen

Non-Store

10.

Advance

the

Type

564

Intensity

control

until

the

trace

brilliance

(free

running

sweep)

the

desired

viewing

level.

Adjust

Astigmatism

and

Focus

controls.

11.

Center

the

trace

the

graticule

with

the

Type

382

“A”

Position

control

and/or

the

Offset

control.

12.

Adjust

the

Type

312

Trigger

Sensitivity

and

Time

Posi-

tion

controls

for

stable

triggered

display

the

Type

S-50

output

pulse.

See

Fig.

2-3A

(displayed

signal

amplitude

has

Sages

been

adjusted

divisions

turning

the

Type

3S2

gor

foot

Channel

Variable

control).

Display

Characteristics

Fastrise

Input

Pulses

Fig.

2-3A

the

displayed

pulse

shows

overshoot

the

end

the

fastrise

portion

the

pulse.

This

overshoot

normal

when

using

the

Type

S-4

together

with

fastrise

pulse

generator

such

the

Type

$-50.

Since

the

100%

amplitude

the

pulse

divisions,

each

division

represents

20%.

Fig.

2-3A

the

overshoot

appears

have

amplitude

approximately

0.4

divisions

8%.

The

preshoot

portion

the

Type

S-50

output

pulse

the

relatively

slow

rise

signal

driving

the

Type

S-50

output

tunnel

diode.

The

fastrise

portion

occurs

the

output

tunnel

di-

ode

switches.

Thus,

the

region

labeled

the

preshoot

por-

tion

the

pulse

Fig.

2-3A

apparently

much

slower

than

the

fastrise

portion.

The

presence

several

dots

indicates

samples

taken

during

the

preshoot,

and

the

absence

samples

during

the

fastrise

portion

indicates

the

difference

risetime.

The

appearance

these

portions

the

Type

S-50

output

pulse

faster

sweep

rate

shown

Fig.

2-3B.

(C)

Determining

displayed

risetime.

Set

Type

3T2

Range

switch

100

and

Time

Magnifier

X10.

Set

the

Type

312

Start

Point

switch

With

Trigger.

Turn

the

Type

312

Time

Position

control

until

display

simi-

lar

that

Fig.

2-3B

visible.

This

waveform

shows

that

after

rather

gradual

rise

requiring

about

divisions)

Fig.

2-3.

Fastrise

pulse

displays.

Operating

Instructions—Type

S-4

the

signal

amplitude

suddenly

increases

approximately

500

mV.

The

displayed

pulse

of Fig.

2-3B

typical

the

Type

S-50

and

Type

S-4

combination.

Fig.

2-3B

the

aberration

occurring

approximately

4.5

after

the

fastrise

portion

the

pulse

result

reflec-

tion

the

input

gate

the

Type

S-4.

portion

the

fast-

rise

part

the

pulse

traveling

from

the

Type

S-50,

through

the

length

coax

and

through

the

Type

S-4

input

con-

nector

the

input

gate,

reflected

back

the

Type

S-50.

This

round

trip

requires

approximately

4.5

when

the

Type

S-50

and

Type

S-4

are

interconnected

with

section

coaxial

line.

Adding

second

section

line

series

with

the

first

would

result

the

reflection

being

displayed

4ns

2ns)

later,

8.5ns

after

the

fastrise

portion

the

pulse.

Determining

Displayed

Risetime

Set

the

fastrise

portion

the

displayed

pulse

grati-

cule

center,

shown

Fig.

2-3B,

using

the

Time

Position

control

the

Type

372.

Change

the

Type

3S2

deflection

factor

100

mV/Div

(Variable

CAL).

Vertically center

the

fastrise

portion

the

displayed

pulse using

the

Type

3S2

Channel

Offset

control.

Set

the

Type

312

Time

Magnifier

X50 and

readjust

the

triggering

for

minimum

jitter

using

the

Type

312

Sensiti-

vity

control.

Set

the

Type

3T2

Display

Mag

X10

and

carefully

adjust

the

Time

Position

control

for

display

similar

that

Fig.

2-3C.

order

accurately

determine

the

displayed

risetime

the

display

should

photographed

stored

(on

Storage

Oscilloscope

CRT)

permit

careful

analysis.

store

the

display,

set

the

Type

3T2

Display

Mode

Single

Swp.,

the

Type

554

upper

and

lower

screen

for

storage,

and

push

the

Type

3T2

Single

Sweep

Start

pushbutton.

The

pulse

risetime

found

determining

the

horizontal

distance

between

the

10%

and

90%

amplitude

points

and

multiplying

this

distance

the

Time/Div

setting

the

sampling

sweep

unit.

It is

recommended

that

the

100%

amplitude

adjusted

exactly

divisions

using

the

Type

382

Variable

control,

and

the

display

vertically

center-

using

the

Type

382

Offset

control.

This

will

position

the

point

2.5

divisions

below

graticule

center

and

the

100%

point

2.5

divisions

above

graticule

center.

The

10%

amplitude

will

then

appear

divisions

below

graticule

cen-

ter

and

the

90%

point

divisions

above

graticule

center.

information

locating

the

and

the

100%

points

the

displayed

waveform

given

later

this

section.

Gate

Balance

Adjustment

The

Type

S-4

Gate

Balance

may

occasionally

require

re-

adjustment.

The location

the

control

shown

Fig.

2-4.

Channel

sampling

head

can

adjusted

while

ex-

tender

cable

when

inserted

the

sampling

unit.

order

adjust

the

Gate

Balance

Type

S-4

located

the

Channel

compartment

the

sampling

unit,

necessary

remove

the

oscilloscope

side

panel

and any

sampling

head

plugged

into

the

Channel

compartment.

2-4

—

Type

S-4

Sampling

Head

Fig.

2-4.

Gate

Balance

location.

Connect

bench

multimeter

set

for

approximately

full

scale

between

ground

and

the

Type

3S2

Channel

Offset

jack.

Adjust

the

Type

382

Offset

control

until

the

multi-

meter

reads

volts.

Increase

the

meter

sensitivity

and

repeat

the

adjustment

for

greater

accuracy.

Disconnect

the

semi-rigid

cable

from

the

Type

S-50,

leaving

the

other

end

the

cable

connected

the

Type

S-4

input

connector.

Turn

the

Type

312

Trigger

Sensitivity

control

clockwise

free-run

the

trace.

NOTE

Operating

the

sampling

head

without

the

input

connector

terminated

resistor

coaxial

cable

may

cause

vertical

shift

the

zero

signal

baseline

few

millivolts.

This

caused

the

strobe

kickout

signal

being

reflected

from

the

open

input

connector,

and

arriving

back

the

sampling

gate while

conducting.

Because

this,

termin-

ate

the

input

circuit

when

setting

the

display

zero

reference

point.

Also

use

15cm

airline,

cable

providing

least

500

delay,

between

the

Type

S-4

input

and any

tunnel-diode

genera-

tor

circuit

that

sensitive

signals

entering

its

output

circuit.

Switch

the

Type

382

Units/Div

control

throughout

its

range,

adjusting

the

Type

S-4

Gate

Balance

control

for

trace

shift

not

over

one

division

the

Units/Div

control

switched

from

one end

the

other.

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