Tektronix S-1 User manual

INSTRUCTION

MAN

UAL

Serial

Number

Tektronix,

Inc.

S.W.

Millikan

Way

©.

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables:

Tektronix

070-0763-00

468

with

all

requests

a’

‘rial

for

parts

Hise

TIME

MVLTIY

ATOR

PRT

COMM

AAO

MAkMoei

WTO

MULLS

(Vie

arog

heh

POUSE

OWT

+10

RPSL

SEC

PARTS

WST

FOR

SEMICONRVE

TOR

TYPES

mVOLTS

DIV

SAMPLING

HEAD

Fig.

1-1.

Type

S-1

Sampling

Head.

Type

S-1

SECTION

TYPE

S-1

SPECIFICATION

Change

information,

any,

affecting

this

section

will

found

the

vear

the

manual.

General

Information

The

Type

S-1

Sampling

Head

input,

350

ps rise-

time,

plug-in

preamplifier

for

use

some

Tektronix

3S-

series

sampling

units,

such

the

Type

382

Sampling

Unit.

Input

characteristics

the

sampling

system

are

controlled

the

type

sampling

head

use.

The

Type

S-1

can

installed

directly

into

the

Type

382,

used

remotely

optional

foot

extender

cable.

Vertical

deflection

factor

the

sampling

system

labeled

the

top

the

Type

S-1

mVOLTS/DIV;

the

label

refers

the

sampling

unit

Units/Div

switch

that

directly

above

the

head.

portion

the

input

signal

provided

the

Type

352

Sampling

Unit

for

externally

triggering

Type

3T2

Random

Sampling

Sweep.

The

Type

3S2

allows

selection

the

trig-

ger

pickoff

signal

from

the

Channel

sam-

pling

head.

The

selected

trigger

pickoff

signal

returned

the

Type

front

panel

the

Trig

Out

connector.

The

trigger

pickoff

signal

useful

with

any

sampling

sweep

unit

for

repetitive

signals

where

the

triggering

event

does

not

have

displayed.

(Only

the

Type

312

random

process

sampling

allows

the

triggering

event

displayed

using

the

sampling

head

trigger

pickoff

signal.)

Digital

Unit

Program

Connections

The

Type

S-1

contains

connections

its

rear

that

pro-

gram

both

the

decimal

and

the

units

lamps

Type

230

Digital

Unit.

The

S-1

digital!

control

connections

pass

through

the

Units/Div

switch

either

the

Type

385

Type

3586

Programmable

Sampling

Unit,

and

through

the

Type

568

Oscilloscope

the

Type

230

Digital

Unit.

ELECTRICAL

CHARACTERISTICS

The

following

characteristics

apply

over

ambient

tem-

perature

range

0°C

+50°C.

These

characteristics

apply

only

after

the

Type

S-1

has

been

properly

mated

the

sampling

unit

and

indicator

oscilloscope,

and

after

sufficient

warmup

time.

For

the

particular

system

warmup

requirements,

refer

the

amplifier

and

indicator

oscilloscope

instruction

manual.

minute

warmup

time

required

for

Type

3S2-3T2).

procedure

for

mating

the

Type

S-1

the

vertical

amplifier

can

found

the

Operating

Instructions

section

this

manual.

ELECTRICAL

CHARACTERISTICS

Characteristics

Performance

Requirement

Supplemental

Information

Input

Resistance

509

within

Measured

Dot

Response

Adjustable

the

sampling

unit

unity

for

signals

500

P-P;

when

the

plus

dot

response

adjusted

unity,

the

minus

dot

response

will

within

unity,

and

vice

versa.

Operating

Input

Voltage

Range

+1V

—1V,

with

P-P

signals.

Step

signals

greater

than

500

require

than

one

dot

display

100%

the

step

transition.

Maximum

Input

Voltage

-++5

VDC

sine

wave

P-P

MHz.

Transient

Response

Risetime

Pulse

Flatness

Deviation

Displayed

Noise

350

less,

10%

90%.

and

—

the

first

after

the

step

pulse

reaches

50%.

and

—

0.5%

after

the

first

ns.

less,

tangential

noise.

Applies

when

the

step

pulse

Tektronix

Type

284

Pulse

Output

signal

through

airline.

Trace

Baseline

Vertical

Shift

with

Trigger

Repetition

Rate

Change.

less

for

trigger

rate

change

from

kHz.

1-1

NOTES

Type

S-1

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-1

Sampling

Head,

including

instal-

lation

and

First

Time

Operation.

The

Type

S-]

completes

the

circuitry

some

Tektronix

sampling

units,

and

controls

the

input

characteristics

the

vertical

channel

providing

the

Strobe

Generator,

Sam-

pling

Bridge,

and

Preamplifier

circuits.

Such

sampling

unit

the

Type

382,

using

one

two

S-series

sampling

heads.

Type

382

and

sampling

sweep

unit

plugged

into

indicator

oscilloscope

completes

the

sampling

system.

choice

real

equivalent

time

sampling

provided

the

type

sweep

unit

used.

502

input

resistance

allows

the

use

attenuators

and

probes

for

operation

over

wide

range

signal

volt-

ages,

portion

the

input

signal

provided

the

sampling

unit.

the

Type

382,

this

signal

selected

from

Channel

and

returned

the

front

panel

Trig

Out

connector

for

external

triggering

sampling

sweep

units,

Installing

the

Type

S-1

Sampling

Head

Fig.

2-1

shows

the

Type

S-1

partially

installed

into

Type

382

Sampling

Unit

with

Type

561A

Oscilloscope

and

Type

3T2

Random

Sampling

Sweep.

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,

Contact

your

local

Tektronix

Field

Engineer

Representative

for

price

and

availability

these

optional

accessories.

insert

the

Type

S-1

into

the

right

left

hand

compart-

ments

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-1

slowly

into

the

compartment,

the

two

plastic

guides

the

compartment

engage

the

S-1.

Push

the

Type

S-1

completely

into

the

compartment.

Push

the

latch

knob

lock

the

S-1

place.

remove

the

Type

S-1

from

the

compartment,

pull

the

latch

knob

away

from

the

front

panel,

then

pull

the

unit

from

the

compartment.

Sampling

Head

Loteh

knob

Fig.

2-1.

Installation

information,

use the

Type

S-1

extender

cable,

install

fol-

lows:

Pull

the

latch

knob

located

the

head

end

the ex-

ender

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

desired

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-1

the

other

end

the

extender

cable

similar

manner,

and

set

the

latch

knob

hold

place.

remove

the

Type

S-1

from

the

extender

cable,

pull

the

latch

knob

the

front

panel

the

Type

S-1,

and

re-

move

the

unit

from

the

extender

cable.

remove

the

extender

cable

head

from

the

sampling

unit

compartment,

pul!

the

latch

knob

outward

from

the

front

panel,

then

pull

the

unit

free.

2-1

Operating

Instructions—Type

S-1

Mating

The

vertical

deflection

factor

labeled

the

Type

S-1,

and

the

sampling

system

loop

balance

(adjusted

the

Bridge

Bal

control)

must

considered

when

mating

Type

S-1

with

sampling

unit.

The

mVOLTS/DIV

label

the

Type

S-1

names

the

de-

flection

factor,

units

the

sampling

unit

Units/Div

switch

located

directly

above

the

label.

For

example,

with

the

Type

S-1

installed

Type

382

and

the

Units/Div

switch

set

100,

each

major

division

CRT

deflection

corresponds

100

millivolts

input

signal

(when

the

Variable

control

the

Cal

position).

The

deflection

factor

mated

the

indicator

oscilloscope

CRT

adjusting

the

sampling

unit

Gain

control

while

the

Type

S-1

Channel

Refer

the

sampling

unit

manual

for

its

Gain

adjustment.

Power

supplies

and

circuit

interconnections

are

made

through

the

two

con-

nectors

the

rear

the

Type

S-1.

Bridge

Balance

The

Bridge

Balance

control

the

Type

S-1

should

ad-

justed

whenever

the

sampling

head

changed

from

one

sam-

pling

unit

another,

operated

extender

cable.

Location

the

control

and

details

its

adjustment

are

de-

scribed

First

Time

Operation

which

follows.

FIRST

TIME

OPERATION

The

First

Time

Operation

procedure

utilizes,

addition

the

Type

S-1,

Type

382,

Type

561A,

and

Type

284.

The

Type

3T2

Random

Sampling

Sweep

unit

recommended

for

use

with

the

Type

S-1

because

random

sampling

permits

viewing

the

signal

advance

the

triggering

event.

Such

trigger

lead-time

required

the

Type

S-1

with

the

Type

382

view

fast

pulses

without

pretrigger.

The

Type

284

used

signal

source.

Setup

Information

With

the

Type

561A

Power

switch

off,

insert

Tek-

tronix

Type

382

Sampling

Unit

into

the

vertical

compart-

ment

{leff)

and

Tektronix

Type

3T2

Random

Sampling

Sweep

into

the

horizontal

plug-in

compartment

(right).

Insert

the

Type

S-1

Sampling

Head

into

Channel

compartment

(left)

the

Type

3S2

leaving

the

latch

knob

free

move.

Once

the

S-1

seated,

push

the

latch

lock

place.

Set

the

Intensity

control

the

Type

561A

fully

counter-

clockwise.

Connect

the

Type

561A

power

source

which

meets

its

voltage

and

frequency

requirements.

Set

the

Power

switch

On.

Allow

about

minutes

warm-up

the

units

reach

operating

temperature

before

proceeding.

For

single-trace

operation,

set

the

controls

follows:

Type

352

Display

Mode

Normal-Smooth

Normal

2-2

and

Position

offset

(both

channels)

Units

/Div

(both

Channels)

Variable

(both

Channels)

Invert

(both

Channels}

Dot

Response

(both

Channels)

Delay

Horiz

Position

Samples/Div

Display

Mode

Start

Point

Sweep

Rate

Range

Display

Mag

Time

Magnifier

Variable

Midrange

turns

from

one

end)

200

Cal

Push

Midrange

Type

312

Midrange

o'clock

position

Normal

With

Trigger

200

ns/Div

Cal

Both

fully

clockwise

Fully

clockwise

Time

Position

Trig

Sensitivity

Recovery

Time

Optional

Trigger

Polarity

Trigger

Source

Ext

Type

284

Square

Wave

Amplitude

1.0

¥*

Period

Mode

Square

Wave

Output

Lead

Time

Optional

Connect

the

square

wave

output

signal

from

the

Type

284

the

input

connector

the

Type

S-1

through

500

coaxial

cable

and

attenuator.

Connect

the

trigger

out-

put

signal

from

the

Type

284

through

coaxial

cable

the

External

Input

connector

the

Type

3712.

Advance

the

Type

561A

Intensity

control

until

the

free

running

trace brilliance

the

desired

viewing

level.

Center

the

trace

the

graticule

with

the

Type

382

Position

control

and/or

the

Offset

control.

Adjust

the

Type

312

Trig

Sensitivity

control

for

stable

triggered

dis-

play

two-cycle

square

wave

with

amplitude

about

2.5

divisions.

Adjusting

Dot

Response

Sequential

Sampling

One

method

adjusting

the

dot

response

unity

use

double

multiple-triggered

sweep.

This

causes

each

sample

respond

the

full

signal

amplitude

and

produce

display

similar

Fig.

2-2A

10.

obtain

display

similar

that

Fig.

2-2A

turn

the

Type

312

Trig

Sensitivity

control

clockwise

into

the

‘Used

through

attenuator

for

0.5

into

the

Type

S-1.

unity

dot

response

ns/

Div

OAAae

BAAD

‘

(B}

Double-Triggered,

unity

dot

response

200

mV/Div

200

ns/Div

(C)

Properly

triggered

Fig.

2-2.

Typical

display

for

wnity dot

response

adjustment

normal

sequential

sampling.

Operating

Instructions—Type

S-1

free

run

region.

Then

adjust

the

Recovery

Time

control

un-

til

the

desired display

appears.

11.

Turn

the

Channel

Dot

Response

control

obtain

display

showing

unity

dot

response

(see

Fig.

2-2B).

Fig

2-2A

shows

greater

than

unity

dot

response.

This

requires

counter-

clockwise

rotation

the

Dot

Response

control

obtain

unity

dot

response.

The

double

triggering

shown

Fig.

2-2A

and

useful

adjust

the

dot

response

unity,

but

should

not

used

making

measurements.

12.

After

the

dot

response

adjusted

unity,

turn

the

Trig

Sensitivity

control

counterclockwise

into

the

triggered

region

for

stable

trace

properly

triggered

display

similar

Fig,

2-2C.

Random

Sampling

13.

Another

convenient

method

adjusting

the

dot

re-

sponse

unity

can

shown

with

random

process

sampling.

Change

the

following

controls:

Type

372

Start

Point

Before

Trigger

Time

Magnifier

Type

284

Period

100

14.

dot

response

greater

than

unity

will

produce

dis-

play

similar

Fig.

2-3A.

Dot

response

deviations

from

unity

are

best

observed

when

the

Type

372

Time

Magnifier

set

X50.

Adjust

the

Type

382

Dot

Response

con-

trol

for

unity dot

response

display

similar

Fig.

2-38.

Bridge

Balance

Adjustment

15.

Connect

bench

multimeter

set

for

30V

full

scale

between

ground

and

the

Type

352

Channel

Offset

jack.

Adjust

the

Type

382

Offset

contro!

until

the

multimeter

reads

Volts.

Increase

the

meter

sensitivity

and

repeat

the

adjustment

for

greater

accuracy.

16,

Disconnect

the

coaxial

cable

from

the

Type

284,

leav-

ing

the

other

end

the

cable

connected

the

Type

5-1

input

connector.

Turn

the

Type

3S2

Trig

Sensitivity

con-

trol

clockwise

free

run

the

trace.

NOTE

Operating

the

sampling

head

without

the

input

connector

terminated

resistor

coaxial

cable

will

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

bridge

while

the

bridge

conducting.

Because

this

phenomena,

set

the

display

zero

reference

point with

the

input

between

the

Type

S-1

input

between

the

Type

S-1

input

and

any

tunnel-diode

pulse

generator

circuit

that

sensitive

sig-

nals

centering

its

output

circuit.

2-3

Operating

Instructions—Type

S-1

200

mV/

Div

Fig. 2-3.

Typical

display

for

unity

dot

response

adjustment

random

sampling

operation,

17.

Switch

the

Type

382

Units/Div

control

throughout

its

range,

adjusting

the

Type

S-1

Bridge

Bal

control

for

trace

shift

not

over

one

division

the

Units/Div

control

switched

from

one

end

the

other.

See

Fig.

2-4

for

the

location

the

Bridge

Bal

control.

This

adjustment

must

made

whenever

the

Type

S-1

shifted

from

one

sampling

unit

another,

operated

sampling

head

extender

cable.

GENERAL

OPERATING

INFORMATION

Input

Signal

Connection

Precautions

Accurate

displays

signals

containing

very

fast

tran-

sitions

very

high

frequencies

are

possible

only

when

the

coupling

circuit

does

not

distort

the

signal.

The

Type

S-1

input

resistance

509

requiring

the

use

high

quality

509

coaxial

cables

and

attenuators

between

the

signal

source

and

the

sampling

head

input

connector.

Tektronix,

Inc.

offers

several

special

probes

that

permit

the

signal

source

less

than

caused

the

501

input

2-4

Bridge

Bal

Adjustment

Fig.

2-4,

Bridge

Bal

Location,

resistance.

See

your

Tektronix

Field

Engineer

Represent:

ative

about

such

special

input

coupling

devices,

Input

Voltage

Considerations

Proper

displays

various

signal

amplitudes

require

spec:

ial

attention

the

type

time

base

generation

use

There

are

also

input

voltage

limits

that

must

observed

prevent

either

display

distortion

damage

the

Type

S-1.

For

greater

details

coupling

high

frequency

input

signals,

and

precautions

observed,

refer

the

sam

pling

unit

Instruction

Manual

supplied

with

your

sampling

instruments,

Maximum

input

signal

voltage

important

consider-

ation

any

sampling

system.

Signals

greater

than

-+1

volt

generally

will

not

permit

valid

display.

Thus

any

signals

greater.

amplitude

should

attenuated

some

manner

before

being

applied

the

Type

S-1

input

con-

nector,

Maximum

input

voltage

without

damage

the

in-

put

termination

resistor

-+-5

—5

volts

DC,

volts

peak

sine

wave

signals

the

frequency

domain

MHz

below.

Where

unity

dot

response

required,

accurate

displays

are

possible

achieve

only

when

the

input

amplitude

and

the

time

base

generator

mode

are

both

considered,

The

two

time

base

generation

modes

are

(1)

normal

process

sampling,

where

each

dot

displayed

sequence

across

the

CRT,

and

(2)

random

process

sampling

where

the

dots

are

not

necessarily

displayed

in a

sequence

that

progresses

uniformly

across

the

CRT.

(The

Type

3T2

Random

Sampling

Sweep

unit

presents

random

process

sampling

displays

controlled

quence

very

similar

normal

process

sampling

when

the

Time

Magnifier

switch

and

the

trigger

sig-

nal

repetitfon

rate

uniform.)

The

random

process

dot

se-

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