Tektronix S-2 User manual

INSTRUCTION

MIAN

UAL

Serial

Number

Tektronix,

Inc.

S.W.

Millikan

Way

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

070-0764-00

Cables:

Tektronix

468

rea

MM!

nstrument

Type

Sarial’

RSL

Number

with

all

requests

for

paris

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“IME

MULTTYIBRATOR—

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out

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Pate

COMMAND

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BW)

Tes

ft;

RPARTS

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FOR

SEMMILGNRUGTOA

TYPES

Atel

Wosel

mVOLTS/DIV

TYPE

S-2

SAMPLING

HEAD

Fig.

1-1.

Type

5-2

Sampling

Head.

Type

S-2

SECTION

TYPE

S-2

SPECIFICATION

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual.

General

Information

The

Type

S-2

Sampling

Head

50Q

input,

rise-

time,

plug-in

preamplifier

for

use

some

Tektronix

3S-series

sampling

units,

usch

the

Type

352

Sampling

Unit.

Input

characteristics

the

sampling

system

are

controlled

the

type

sampling

head

use.

The

Type

S-2

can

installed

directly

into

the

Type

352,

used

remotely

optional

foot

extender

cable.

Vertical

deflection

factor

the

sampling

system

labeled

the

top

the

Type

S-2

mVOLTS/DIV;

the

label

refers

the

sampling

unit

Units/Div

switch

that

directly

above

the

head.

portion

the

input

signal

provided

the

Type

382

Sampling

Unit

for

externally

triggering

Type

372

Random

Sampling

Sweep.

The

Type

3S2

allows

selection

the

trigger

pickoff

signal

from

the

Channel

sampling

head.

The

selected

trigger

pickoff

signal

returned

the

Type

352

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

when

using

the

sampling

head

trigger

pickoff

signal.

Digital

Unit

Program

Connections

The

Type

S-2

contains

connections

ifs

rear

that

program

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

355

Type

386

Program-

mable

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-2

has

been

properly

mated

the

sampling

unit

and

indicator

oscilloscope,

and

after

suf-

ficient

warmup

time.

For the

particular

system

warmup

re-

quirements,

refer

the

amplifier

and

indicator

oscillo-

scope

instruction

manual.

minute

warmup

time

required

for

Type

382

—

3T2).

procedure

for

mating

the

Type

S-2

the

vertical

amplifier

can

found

the

Operating

Instruc-

tions

section

this

manual.

ELECTRICAL

CHARACTERISTICS

Characteristics

Performance

Requirement

Supplemental

Information

Input

Resistance

within

Measured

Dot

Response

Adjustable

the

sampling

unit

unity

for

signals

200

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

200

require

than

one

dot

display

100%

the

step

transition.

Maximum

Input

Voltage

VDC

sine

wave

10 V

P-P

MHz.

Transient

Response

Risetime

less,

10%

90%.

Pulse

Flatness

Deviation

+5%

and

—5%

the

first

2.5

after

the

step

pulse

reaches

50%.

and

—2%

after

the

first

2.5

ns.

Applies

when

the

step

pulse

Tektronix

Type

284

Pulse

Output

signal

through

airline.

Displayed

Noise

less,

tangential

noise.

Trace

Baseline

Vertical

Shift

with

Trigger

Repetition

Rate

Change.

less

for

trigger

rate

change

from

kHz.

1-1

NOTES

Type

S-2

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-2

Sampling

Head,

including

installa-

tion

and

First

Time

Operation.

The

Type

S-2

completes

the

circuitry

some

Tektronix

sampling

units,

and

controls

the

input

characteristics

the

vertical

channel

providing

the

Strobe

Generator,

Sampling

Bridge,

and

Preamplifier

circuits.

Such

sampling

unit

the

Type

352,

using

one

two

S-series

sampling

heads.

Type

382

and

sampling

sweep

unit

plugged

into

indi-

cator

oscilloscope

completes

the

sampling

system.

choice

real

equivalent

time

sampling

provided

the

type

the

sweep

unit

used,

502

input

resistance

allows

the

use

509

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-2

Sampling

Head

Fig.

2-1

shows

the

Type

S-2

partially

installed

into

Type

352

Sampling

Unit

with

Type

561A

Oscilloscope

and

Type

3T2

Random

Sampling

Sweep.

The

sampling

head

{or

heads)

can

plugged

into

the

sampling

unit as

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-2

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-2

slowly

into

the

compartment,

the

two

plastic

guides

the

compartment

engage

the

S-2,

Push

the

Type

S-2

completely

into

the

compartment.

Push

the

latch

knob

lock

the

S-2

place.

remove

the

Type

S-2

from

the

compartment,

pull

the

latch

knob

away

from

the

front

panel,

then

pull

the

unit

from

the

compartment.

Type

$-2

Sampling

Head

Latch

knob

Fig.

2-1.

Installation

information.

To use

the

Type

S-2

on an

extender

cable,

install

follows:

Pull

the

latch

knob

located

the

head

end

the

extender

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-2

the

other

end

the

extender

cable

similar

manner,

and

set

the

latch

knob

hold

place.

remove

the

Type

S-2

from

the

extender

cable,

pull

the

latch

knob

the

front

panel

the

Type

S-2,

and

remove

the

unit

from

the

extender

cable,

remove

the

extender

cable

head

from

the

sampling

unit

compartment,

pull

the

latch

knob

outward

from

the

front

the

panel,

then

pull

the

unit

free.

2-1

Operating

Instructions—Type

S-2

Mating

The

vertical

deflection

factor

labeled

the

Type

S-2,

and

the

sampling

system

loop

balance

(adjusted

the

Bridge

Bal

control)

must

considered

when

mating

Type

S-2

with

sampling

unit.

The

mVOLTS/DIV

label

the

Type

S-2

names

the

deflec-

tion

factor

units

the

sampling

unit

Units/Div

switch

located

directly

above

the

label. For

example,

with

the

Type

S-1

installed

in a

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-2

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-2.

Bridge

Balance

The

Bridge

Balance

control

the

Type

S-2

should

adjusted

whenever

the

sampling

head

changed

from

one

sampling

unit

another,

operated

extender

cable.

Location

the

control

and

details

its

adjustment

are

described

First

Time

Operation

which

follows.

FIRST

TIME

OPERATION

This

First

Time

Operation

procedure

utilizes,

addition

the

Type

S-2,

Type

382,

Type

561A,

and

Type

284.

The

Type

3T2

Random

Sampling

Sweep

unit

recommended

for

use

with

the

Type

S-2

because

random

sampling

permits

viewing

the

signal

advance

the

triggering

event.

Such

trigger

lead-time

required

the

Type

S-2

with

the

Type

382

view

fast

pulses

without

pre-trigger.

The

Type

284

used

signal

source.

Setup

Information

With

the

Type

561A

Power

switch

off,

insert

Tektronix

Type

382

Sampling

Unit

into

the

vertical

compartment

(left)

and

Tektronix

Type

3T2

Random

Sampling

Sweep

into

the

horizontal

plug-in

compartment

(right).

Insert

the

Type

S-2

Sampling

Head

info

Channel

compartment

(left)

the

Type

382

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:

2-2

Type

352

Display

Mode

Normal-Smooth

Normal

and

Position

Midrange

Offset

Midrange

turns

(both

Channels}

from

one

end}

Units

/Div

100

(both

Channels}

Variable

(both

channels}

Cal

Invert

(both

Channels}

Push

Dot

Response

Midrange

(both

Channels)

Delay

Midrange

Type

312

Horiz

Position

Midrange

Samples/Div

o'clock

position

Display

Mode

Normal

Start

Point

With

Trigger

Sweep

Rate

200

ns/Div

Range

Display

Mag

Time

Magnifier

Variable

Cal

Time

Position

Both

fully

clockwise

Trig

Sensitivity

Fully

clockwise

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-2

through

50Q

coaxial

cable

and

attenuator.

Connect

the

trigger

output

signal

from

the

Type

284

through

coaxial

cable

the

External

Input

50Q

connector

the

Type

372.

Advance

the

Type

561A

Intensity

control

until

the

free

running

trace

brilliance

the

desired

viewing

level.

Center

the

trace

the

graticule

with

the

Type

352

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

divisions.

‘Used

through

attenuator

for

0.2

into the

Type

§-2.

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

free

run

region.

Then

adjust

the

Recovery

Time

control

until

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

sponse

unity

can

shown

with

random

process

sampling.

Change

the

following

controls:

Type

3172

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

X20

50.

Adjust

the

Type

382 Dot

Response

control

for

unity

dot

response

display

similar

Fig.

2-38.

Bridge

Balance

Adjustment

15.

Connect

bench

multimeter

set

for

full

scale

between

ground

and

the

Type

382

Channel

Offset

jack

Adjust

the

Type

382

Offset

contro!

until

the

multimeter

reads

Volts.

Increase

the

meter

sensitvity

and

repeat

the

adjustment

for

greater

accuracy,

16.

Disconnect

the

coaxial

cable

from

the

Type

284,

leaving

the

other

end

the

cable

connected

the

Type

S-2

input

connector.

Turn

the

Type

352

Trig

Sensitivity

control

clock-

wise

free

run

the

trace

NOTE

Operating

the

sampling

head

without

the

input

connector

terminated

501

resistor

coaxial

cable

will

cause

vertical

shift

the

zero

signal

baseline

few

millivolts.

This*is

caused

the

Operating

Instructions—Type

$-2

(Al

Double-triggered,

{C)

Properly

triggered

Fig.

2-2.

Typical

display

for

unity dot

response

adjustment

normal

sequential

sampling

2-3

Operating

Instructions—Type

5S-2

100

mV/Div

Bridge

Bal

Adjustment

Fig,

2-3.

Typical

display

for

unity

dot

response

adjustment

random

tampling

operation,

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

circuit

terminated,

Also

use

least

airline

between

the

Type

S-2

input

and

any

tunnel-diode

pulse

generator

circuit

that

sensitive

signals

entering

its

output

circuit.

17.

Switch

the

Type

382

Units/Div

control

throughout

its

range,

adjusting

the

Type

S-2

Bridge

Bal

control

for

trace

shift of

not

over

one

division

the

Units/Div

control

switched

from

one

end

the

other,

See

Fig.

2-4

for

the

loca-

tion

the

Bridge

Bal

control.

This

adjustment

must

made

whenever

the

Type

S-2

shifted

from

one

sampling

unit

another,

operated

sampling

head

extender

cable.

GENERAL

OPERATING

INFORMATION

Input

Signal

Connection

Precautions

Accurate

displays

signals

containing

very

fast

transi-

tions

very

high

frequencies

are

possible

only

when

the

2-4

Fig,

2-4,

Bridge

Bal

Location.

coupling

circuit

does

not

distort

the

signal.

The

Type

S-2

nput

resistance

502

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

oading

less

than

that

caused

the

502

input

resis

tance.

See

your

Tektronix

Field

Engineer

Representative

about

such

special

coupling

devices

Input

Voltage

Considerations

Proper

displays

various

signal

amplitudes

require

special

attention

the

type

time

base

generation

use.

There

are

also

input

voltage

limits

that

must

observed

prevent

either

display

distortion

damage

the

Type

S-2,

For

greater

details

coupling

high

frequency

input

signals,

and

precautions

observed,

refer

the

sampling

unit

Instruction

Manual

supplied

with

your

sampling

instruments

Maximum

input

signal

voltage

important

consideraion

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-2

input

connector,

Maxi-

mum

input

voltage

without

damage

the

input

termination

resistor

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

generation

mode

are

both

considered.

The

two

time

generation

modes

are:

(1)

normal

process

sampling,

;

the

CRT,

and

;

sampling

where

the

dots

are

not

neces-

where

each

dot

displayed

sequence

acro

(2)

random

process

sarily

displayed

sequence

that

progresses

uniformly

across

the

CRT.

[The

Type

3T2

Random

Sampling

Sweep

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