Tektronix 3S3 Manual de usuario

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INSTRUCTION

MAN

UAL

Serial

Number

Tektronix,

Inc.

S.W.

Millikan

Way

@

P.

O.

Box

500

@

Beaverton,

Oregon

97005

@

Phone

644-0161

@

Cables:

Tektronix

070-0759-00

468

slat

.

-

Co

ma

direct

ed

d

=

iM

ae

Mu

ea

Nil

pata.

i

LOCK

Su

farti.a,5

TYPE

3S2

SAMPLING

UNIT

A

POSITION

B

POSITION

DC

OFFSET

+1¥V

DUAL-TRACE

DC

OFFSET

+1V

DOT

RESPONSE

mVOLTS/DIV

mVOLTS/DiV-

TYPE

S-1

i

TYPE

S25)

SAMPLING

HEAD

oF

~

SAMPLING

HEAD

RISETIME

<350ps

Fig.

1-1.

Type

352

Sampling

Unit.

Type

382

SECTION

I

SPECIFICATION

Change

information,

if

any,

affecting

this

section

will

be

found

at

the

rear

of

the

manual.

General

Information

The

Type

382

Sampling

Unit

is

a

dual-channel

vertical

amplifier

plug-in

unit

designed

for

operation

in

any

one

of

the

Tektronix

Type

560-Series

Oscilloscopes

except

the

Type

561

(it

will

operate

in

the

Type

561A).

The

Type

382

accepts

‘'S'

Series

sampling

heads.

The

sampling

heads

determine

the

input

characteristics

of

the

sampling

unit

and

the

availability

of

the

trigger

pickoff.

The

Type

382

will

operate

with

any

Tektronix

3T-series

sampling

unit.

The

Type

3T2

Random

Sampling

Sweep

is

recommended,

because

it

can

display

the

triggering

event

without

a

pretrigger

or

signal

delay

line.

Conventional

or

real

time

2B-

or

3B-series

time-base

units

include

the

Types

2B67,

3B1,

3B4

and

the

3B5

non-digital

time

bases,

and

the

Type

3B2

Analog/Digital

Time

Base

Unit.

The

Type

382

provides

the

vertical

information

needed

for

voltage

meas-

urements

by

Tektronix

digital

readout

systems,

such

as

the

Type

567-Type

6R1A,

or

the

Type

568-Type

230.

One

or

two

“S”

Series

sampling

heads

can

be

plugged

into

the

Type

3S2,

or

used

remotely

on an

optional

exten-

der

cable

unit.

The

Type

3S2

provides

the

power

for

the

sampling

heads.

Interconnections

to

the

circuits

in

the

sampling

heads

are

provided

by

connectors

in

the

sampling

head

compartments

of

the

Type

382.

If

a

trigger

pickoff

is

provided

in

the

sampling

head,

the

Type

352

provides

a

trigger

selection

circuit

and

returns

a

portion

of

the

input

signal

to

the

front

panel

for

externally

triggering

a

sampling

sweep

unit.

An

internal

reconstructed

signal

is

provided

to

trigger

the

real-time

time-base.

Sampled

signals

are

presented

to

both

the

oscilloscope

CRT

and

to

the

front

panel

connectors

for

external

use

with

auxiliary

equipment

such

as

pen

recorders.

The

two

Chan-

nels

may

be

displayed

either

individually

or

in

one

of

three

combined

modes:

DUAL-TRACE,

A+B

(Algebraic

addition},

or

a

VERT/B

HORIZ

(X-Y).

The

A

VERT/B

HORIZ

(X-Y)

mode

does

not

apply

in

real

time

operation.

ELECTRICAL

CHARACTERISTICS

Digital

Unit

Compatibility

The

Type

3S2

is

compatible

for

operation

with

all

Type

230

Digital

Units

and

all

Type

6RIA

Digital

Units.

It

is

compatible

with

ail

Type

6R1

Digital

Units

SN

695

and

up.

The

Type

6R1

Digital

Units

SN

101-694

require

the

installa-

tion

of

Tektronix

Modification

Kit

040-0342-00

when

oper-

ating

with

a

Type

3872.

The

following

characteristics

apply

over

an

ambient

tem-

perature

range

of

0°C

to

+

50°C.

These

characteristics

apply

only

after

the

Type

3S2

VERT

GAIN

control

has

been

properly adjusted

for

the

oscilloscope

and

after

a

sufficient

warm-up

time.

For

particular

system

warm-up

requirements,

refer

to

the

main

frame

oscilloscope

instruction

manual.

A

procedure

for

mating

the

Type

3S2

to

each

oscilloscope

can

be

found

in

the

Operating

Instructions

section.

The

Type

382

meets

the

tolerances

stated

below

after

a

5-minute

warmup.

ELECTRICAL

CHARACTERISTICS

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factors

Units/Div

Switch

Range

2

to

200

in

7

steps

in

a

1-2-5

sequence

with

Units/Div

labeled

on

the

sampling

head.

Accuracy

Within

3%,

NORMAL;

6%

SMOOTH

Normal

sequential

sampling

with

at

least

20

samples

per

cycle

of

displayed

square

wave.

Units/Div

VARIABLE

Range

Reduction

in

deflection

to

0.7

or

less

when

control

is

turned

CCW

from

CAL

position,

and

2.5

times

or

more

increase

in

deflection

when

control

is

turned

CW

from

CAL

position.

Interchannel

Delay

Range

At least

+5ns

‘to

—5ns.

With

two

same

type

sampling

heads

plugged

in,

using

time-coincident

sig-

nals.

Loop

Gain

NORMAL

control.

Can

be

set

to

unity

with

DOT

RESPONSE

|

Range

of

DOT

RESPONSE

control

is

<0.95

to

>1.05.

@1

1-1

Specification—Type

352

ELECTRICAL

CHARACTERISTICS

(cont'd)

Characteristic

Performance

Requirement

Supplemental

Information

SMOOTH

Loop

gain

is

reduced

to

be

<0.3.

Random

noise

in

display

reduced

to

approx

\.

Dot

Slash

Vertical

dot

drift

is

<

0.1

div

when

sampling

|

Measure

with

Units/Div

switch

at

200

sweep

unit

is

triggered

at

20

Hz.

with

no

signal

input

to

the

sampling

head.

OFFSET

Output

Voltage

Range

+10

to

—10

volts.

Accuracy

Actual

DC

OFFSET

Voltage

is

0.1

X

Source

Resistance

10kQ

within

1%.

OFFSET

Output

voltage

within

2%.

DC

OFFSET

Range

+1

to

—1

volt'.

A

Output,

B

Output

Amplitude

in

Volts

Signal

input

times

Maximum

output

voltage

+4

V.

Source

(Referred

to

Input}

200

Resistance

10kQ,

within

0.5%.

Units/Div

Setting

Accuracy

(Referred

to

Input)

Within

2%.

Accuracy

(Referred

to

CRT)

Within

3%.

(200

mV/Div).

Accuracy

of

Vertical

Signal

to

Within

3%.

Digital

Unit

TRIG

OUT

(SN

B040250-up)

(with

|

Approximately

1

inut

signal

voltage

into

Type

S-1,

5-2}

500

for

AC.

Approximately

.1X

input

sig-

Amplitude

(referred

to

the

Type

|nal

voltage

into

509

for

DC.

Coupling

time

S-1,

S-2

input)

constant

is

5s.

Approximately

1

for

both

AC

and

DC

signals

into

1

MQ.

Risetime

2ns

or

less,

10%

to

90%,

into

50

9

using

70

ps

risetime

input

pulse

Strobe

signal

in

Trig

Out

Signal

|

<50mV

peak

into

500

TRIG

OUT,

SN

B010101

to

SN

Approximately

0.1

X

input

signal

volt-

B030249

{with

Type

S-1, $-2)

age

DC

coupled

into

509.

Amplitude

(Referred

to

the

Type

Approximately

21/)>

input

signal

volt-

$-1,

$-2

input)

age

into

1

MQ.

Risetime

0.6ns

or

less,

10%

to

50%,

into

500

using

70

ps

risetime

input

pulse.

Strobe

signal

in

Trig

Out

signal

|

<<10

mV

peak

into

50

Q.

Position

Indicator

Lamps

One

indicator

lamp

will

be

on

and

the

other

off

when

CRT

dot

is

more

than

4

divisions

away

from

the

graticule

centerline.

POSITION

Range

>

+5

to

—5

vertical

divisions

from

the

grati-

|

When

DC

OFFSET

is

set

to

deliver

OV

cule

center.

to

OFFSET

output

jack.

1Unless

otherwise

stated

on

the

sampling

head

front

panel.

ENVIRONMENTAL

CHARACTERISTICS

Storage

Operating

Temperature—

—40°C

to

465°C.

Operating

Temperature—

0°C

to

+50°C.

Altitude—

To

50,000

feet.

Operating

Altitude—

To

15,000

feet.

MECHANICAL

CHARACTERISTICS

Dimensions—

Height

61%

inches

Construction—

Aluminum

alloy

chassis

with

epoxy

laminated

circuit

boards.

Front

panel

is

anodized

alu-

Width

41,

inches

minum.

Length

14¥,

inches

Accessories—

An

illustrated

list

of

the

accessories

supplied

with

the

Type

352

is

at

the

end

of

the

Me-

Approximate

dimensions

including

knobs

and

connectors.

chanical

Parts

List

pullout

pages.

Type

382

SECTION

2

OPERATING

INSTRUCTIONS

Change

information,

if

any,

affecting

this

section

will

be

found

at

the

rear

of

the

manual.

General

Information

This

section

discusses

installation,

first

time

operation,

function

of

front

panel

controls

and

connectors,

basic

opera-

tion

and

applications

of

the

Type

382.

If

you

are

unfamiliar

with

sampling,

it

may

be

very

helpful

to

read

Section

3,

Basic

Tektronix

Sampling

Principles,

before

proceeding

with

this

section.

The

Type

352

is

a

special

purpose

dual-channel

sampling

unit

designed

to

operate

with

the

following

indicator

oscillo-

scopes:

Type

561A,

RM561A,

Type

567,

RM567,

Type

568,

and

R568.

The

Type

3S2

accepts

S-series

sampling

heads

which

determine

the

input

characteristics

of

the

sampling

system

and

provide

a

trigger

pickoff.

For

equivalent

time

sampling,

the

sampling

system

consists

of

an

indicator

oscilloscope,

Type

382

with

sampling

head

(or

heads),

and

a

sampling

sweep

unit.

A

random

sampling

sweep

unit

such

as

the

Type

312

is

recommended,

because

it

eliminates

the

necessity

of

pretriggering

or

signal

delay

for

viewing

a

repetitive

signal.

The

Type

3S2

can

be

used

for

real

time

operation

with

all

real-time

time-base

units

such

as

Type

2B67,

3B1, 3B2,

3B3,

3B4,

and

3B5.

An

internal

trigger

source

from

the

display

signal

is

provided

for

real

time

operation.

The

vertical

deflection

factors

of

2

to

200

are

calibrated

to

the

units

labeled

on

the

sampling

head.

Sampling

head

extender

cable

units

are

available

to

operate

the

S-series

sampling

heads

remotely

up

to

6

feet

away.

Three-foot

sampling

head

extender

cable

is

Tektronix

Part

No.

012-

0124-00.

Six-foot

sampling

head

extender

cable

is

Tek-

tronix

Part

No.

012-0125-00.

Contact

your

local

Tektronix

Field

Engineer

or

Representative

for

price

and

availability

of

these

optional

accessories.

Installing

the

Type

3S2

in

the

Oscilloscope

The

Type

382

is

designed

to

drive

the

vertical

deflection

plates

of

the

oscilloscope

CRT,

and

therefore

is

installed

in

the

left-hand

compartment

of

the

oscilloscope.

NOTE

The

Horiz

Plug-in

Compatibility

switch

SW6,

lo-

cated

on

the

upper

portion

of

the

internal

bulk-

head

immediately

behind

the

front

panel, must

be

set

to

agree

with

the

type

of

time

base

used.

To

insert

the

Type

382

into

the

oscilloscope

compartment,

turn

the

aluminum

knob

(at

the front

panel

bottom

center)

counterclockwise

several

turns

until

it

stops.

Then

slide

the

Type

382

completely

into

the

compartment.

Once

the

plug-

in

unit

is

seated,

turn

the

aluminum

knob

a

few

turns

clock-

wise

until

it

is

hand-tight.

®

The

Type

352

requires

at

least

one

sampling

head

in

order

to

operate.

The

sampling

head

(or

heads)

can

be

plugged

into

the

Type

3S2

or

used

remotely

by

use

of

an

extender

cable.

To

insert

a

sampling

head

into

the

right

or

left

Channel

compartment

of

the

Type

3S2,

slide

the

unit

completely

into

the

compartment,

leaving

the

latch

at

the

bottom

of

the

unit

free

to

move.

Once

the

sampling

head

is

seated,

push

the

latch

to

lock

the

head

in

place.

To

remove,

pull

the

latch

knob

away

from

the

panel,

then

pull

the

unit

from

the

compartment.

See

Fig.

2-1.

The

same

system

of

connec-

tions

applies

when

using

the

sampling

head

extender

cable.

_

Horizontal

4

Compatibility

switch

SW6

(inside)

*

series

:

: .

‘Sampling

Head

Latch

knob-

Fig.

2-1.

Installation

information

and

location

of

the

Horiz

Plug-In

Compatibility

switch.

Mating

The

Type

382

Vertical

Output

Amplifier

gain

must

be

matched

to

the

indicator

oscilloscope

CRT

deflection

factor

for

accurate

gain

measurements.

The

GAIN

control,

a

screw-

driver

adjustment

on

the

front

panel

adjusts

the

Vertical

Output

Amplifier

gain

of

the

Type

3S2.

Adjustment

of

this

GAIN

control

using

the

Type

284

Pulse

Generator

as

a

signal

source

is

shown

under

Equivalent-Time

Sampling

Operation

which

follows.

For

further

Gain

information,

refer

to

the

Gain

Adjustment

instructions

later

in

this

section.

2-1

Operating

Instructions—Type

352

FIRST-TIME

OPERATION

Equivalent-time

Sampling

Operation

Equivalent-time

sampling

operation

of

the

Type

352

re-

quires

a

sampling

sweep

plug-in

unit

in

the

right

hand

com-

partment

of

the

indicator

oscilloscope.

In

this

First

Time

Operation

procedure,

a

Type

312

Random

Sampling

sweep

is

used.

The

Type

312

is

recommended

for

use

with

the

Type

382,

because

random

sampling

permits

viewing

the

signal

in

advance

of

the

triggering

event.

Such

trigger

lead-

time

is

required

by

the

Type

3S2

to

view

fast

rise

pulses

while

internally

triggering

the

sampling

sweep

unit

from

the

TRIG

OUT

connector.

The

Type

561A

Oscilloscope

is

used,

and

a

Type

284

Pulse

Generator

is

used

as

a

signal

source.

Any

S-

Series

sampling

head

can

be

used.

In

this

First

Time

Opera-

tion,

two

Type

S-1

Sampling

Heads

are

used.

If

you

are

not

already

familiar

with

the

operation

of

the

oscilloscope

and

sampling

sweep

unit,

read

the

manuals

for

these

instru-

ments

before

proceeding.

Single

Trace

Make

sure

that

the

internally

mounted

Horiz

Plug-in

Com-

patibility

switch

SW6

is

in

the

Sampling

3T-Series

position.

See

Fig.

2-1

for

its

location.

Also

make

sure

that

the

Samples/

Div

switch

SW450

on

the

Type

3T2

bulkhead

immediately

behind

the

front

panel

is

set

to

the

Variable

(Front

Panel)

position.

Type

3S2

Horiz

Plug-In

Compatibil-

Sampling

ity

SWé6

(behind

front

panel}

Display

Mode

CH

B

NORMAL-SMOOTH

NORMAL

A

and

B

POSITION

Midrange

DC

OFFSET

Midrange

(5

turns

from

(both

Channels)

one

end}

Units/Div

200

(both

Channels)

VARIABLE

CAL

(both

Channels}

INVERT

Push

in

DOT

RESPONSE

Midrange

(both

channels)

B

DELAY

Midrange

TRIG

OUT

switch

Optional

Type

312

Horiz

Position

Midrange

Samples/Div

9

o'clock

position

Display

Mode

Normal

Start

Point

With

Trigger

Sweep

rate

100

ns

Range

1

ws

Diplay

Mag

x1

Time

Magnifier

XI

Variable

Cal

Time

Position

Both

fully

clockwise

Trig

Sensitivity

Fully

clockwise

Recovery

Time

Optional

Trigger

Polarity

+

Trigger

Source

Ext

Type

284

Square

Wave

Amplitude

1.0V

Period

1

ps

Mode

Square

Wave

Output

Lead

Time

75

ns

Connect

the

Square

Wave

Output

signal

from

the

Type

284

to

the

input

connector

of

the

Sampling

Head

installed

in

the

Channel

B

compartment

through

a

5ns

coaxial

cable.

Any

applied

signal

(to

Type

S-i)

should

be

1

volt

or

less.

This

is

the

normal

signa!

range

for

the

Type

S-1.

See

the

sampling

head

specification

of

the

Type

S-1

or

the

S-

Series

sampling

head

you

are

using

for

further

information.

Connect

the

Trigger

Output

signal

from

the

Type

284

to

the

50Q

external

Trigger

Input

connector

on

the

Type

312

through

a

5Sns

signal

delay

coaxial

cable

with

BNC

con-

nectors.

Center

the

trace

on

the

graticule

with

the

A

POSITION

control,

and

if

necessary

use

the

DC

OFFSET

control.

Ad-

just

the

Trig

Sensitivity

control

on

the

Type

312

counter-

clockwise,

then

clockwise

for

a

stable

trace.

Observe

a

square

wave

display.

If

its

amplitude

is

5

vertical

divisions,

the

Type

352

GAIN

adjustment

on

the

front

panel

is

prop-

erly

set.

If

the

amplitude

is

not

5

vertical

divisions,

adjust

the

GAIN

control

with

a

small

screwdriver

for

5

vertical

divisions.

Now

check

Channel

A

by

applying

the

input

signal

to

the

input

connector

of

the

sampling

head

installed

in

the

Channel

A

compartment.

Change

the

Display

Mode

switch

to

CH

A.

NOTE

Operating

the

sampling

head

without

the

input

connector

terminated

by

a

50

©

resistor

or

coaxial

cable

will

cause

a

vertical

shift

to

the

zero

signal

baseline

by

a

few

millivolts.

This

occurs

because

the

strobe

kickout

signal

is

reflected

from

the

open

input

connector.

The

kickout

signal

arrives

back

at

the

sampling

bridge

during

sampling

time,

while

the

bridge

is

still

conducting.

To

avoid

this,

set

the

display

zero

reference

point

with

the

input

circuit

connected,

not

before

connecting

it.

Also

use

at

least

20cm

of

airline

between

the

Type

S-1

input

and

a

fast

generator

or

circuit

that

is

sensitive

to

the

fast

Strobe

kickout

signal.

Experiment

with

the

various

Channel

B

front-panel

con-

trols,

and

notice

the

effect

of

each.

For

example,

note

the

effect

of

the

POSITION

control

in

positioning

the

display

above

and

below

the

zero

reference

level

at

the

graticule

centerline.

Return

the

Position

control

back

to

midrange,

and

turn

the

DC

OFFSET

control

counterclockwise

to

posi-

tion

the

upper

portion

of

the

square

wave

to

the

graticule

centerline.

This

new

reference

level,

set

by

the

DC

OFFSET

control,

can

be

monitored

at

the

OFFSET

X10

10

kQ

jack.

®

Now,

notice

that

the

POSITION

control

positions

the

dis-

play

above

and

below

the

new

reference

level.

FUNCTION

OF

FRONT

PANEL

CONTROLS

AND

CONNECTORS

A

special

removeable

knob

is

used

on

the

three

controls

A

DOT

RESPONSE,

B

DOT

RESPONSE

and

B

DELAY

allowing

these

controls

to

be

screwdriver

adjusted.

Knob

removal

may

be an

operator

convenience

in

production

line

appli-

cations.

Pull

the

knob

away

from

panel

to

remove.

Observe

the

internal

spring

wire

orientation

before

replacing

a

knob.

The

spring

wire

should

slide

into

the

control

shaft

screw-

driver

slot

to

prevent

knob

slippage

at

the

end

of

control

rotation.

Display

Mode

Selects

one

of

the

five

following

display

Switch

modes.

CH

A

The

Channel

A

signal

is

displayed.

CH

B

The

Channel

BB

signal

is

displayed.

DUAL-TRACE

Both

channel

signals

are

displayed,

but

each

trace

has

one-half

the

normal

number

of

dots

per

sweep.

The

display

switches

from

CH

A

to

CH

B

after

each

CH

A

dot,

and

vice

versa.

While

operating

in

Dual-

Trace,

one

sweep

contains

the

same

num-

ber

of

dots

as

if

only

one

channel

were

displayed.

A+

8B

The

algebraic

sum

(A-+B

as

selected

with

the

INVERT

switches)

of

the

two

Chan-

nels

is

displayed.

A

VERT

The

Channel

A

signal

is

displayed

ver-

B

HORIZ

tically

and

the

Channel

B

signal

is

dis-

played

horizontally

for

X-Y

operation.

Functions

only

with

sampling

sweep

units.

NORMAL-

Selects

unity

loop

gain

at

NORMAL,

SMOOTH

(Red

and

reduces

the

loop

gain

to

<0.3

at

knob

concentric

SMOOTH.

NORMAL

provides

the

correct

with

the

Display

loop

gain

required

when

measuring

rise-

Mode

switch}

time.

SMOOTH

reduces

the

effect

of

random

noise

on

the

display

while

re-

quiring

high

sampling

dot

density

for

the

correct

displayed

risetime.

POSITION

Adjust

the

vertical

position

of

the

A

and

Controls

B

displays

independently.

(The

B_

posi-

tion

control

becomes

the

horizontal

posi-

tion

control

in

the

A

VERT

B

HORIZ

mode.}

DC

OFFSET

These

controls

apply

internal

signal

offset

+1¥V

Controls

voltages

of

+1

to

—1

volt

to

the

sampling

head

(unless

otherwise

stated

on

the

sam-

pling

head

front

panel}.

The

input

signal

zero

reference

(related

to

the

CRT)

is

the

DC

Offset

voltage

instead

of

ground.

Permits

all

portions

of

a

maximum

-++1-volt

input

signal

to

be

positioned

through

the

CRT

vertical

‘window’

even

at

a

deflec-

tion

factor

of

2

units/div

(2mV/Div

with

a

Type

S-1

or

S-2}.

The

vertical

window

is

a

total

of

14mV

when

the

deflection

factor

is

2mV/Div,

and

1.6

volts

when

the

deflection

factor

is

200

mV/Div.

The

front

panel

OFFSET

monitor

jacks

allow

accurate

slide-back

@3

Units/Div

Switches

VARIABLE

Con-

trols

(Same

con-

trol

knob

with

INVERT

Switches)

INVERT

Switches

DOT

RESPONSE

GAIN

TRIG

OUT

Aor

B

Switch

B

DELAY

VERT

OUTPUTS

A

OUTPUT

.2V/DIV,

10

ka

Operating

Instructions—Type

382

voltage

measurements

to

be

made

of

part

or

all

of

a

signal

at

10X

the

actual

offset

voltage

applied

to

the

head.

Selects

calibrated

deflection

factor

for

each

Channel.

The

units

are

selected

and

named

on

the

adjacent

S-Series

sampling

head.

For

example,

with

a

Type

S-1

sam-

pling

head

in

Channel

A

and

the

Chan-

nel

A

Units/Div

switch

set

at

100,

each

major

division

of

deflection

corresponds

to

100

millivolts

of

applied

signal

at

the

S-1

input

connector

when

the

VARIABLE

Control

is

in

the

CAL

position.

Provides

+

and

—

Uncalibrated

variation

of

the

deflection

factor

between

labeled

values

of

the

Units/Div

switches.

Counter-

clockwise

rotation

decreases

the

display

size,

increasing

the

deflection

factor

to

at

least

3.43

times

the

Units/Div

calibrated

value

(display

is

<0.7

as

large

as

when

VARIABLE

is

at

CAL).

Clockwise

rotation

increases

the

display

size,

decreasing

the

deflection

factor

to

at

least

0.4

times

the

Units/Div

calibrated

value

(display

is

>2.5

as

large

as

when

VARIABLE

is

at

CAL).

In

the

Normal

(pushed

in)

position,

a

pos-

itive

input

signal

deflects

the

CRT

beam

upward.

In

the

pulled

position

the

dis-

played

signal

is

inverted.

When

the

Dis-

play

Mode

switch

is

set

to

A

+

B,

alge-

braic

addition

of

Channels

A

and

B

is

obtained.

The

position

of

the

INVERT

switches

determines

the

polarity

of

each

channel

before

algebraic

addition.

Allows

the

loop

gain

of

each

Channel

to

be

adjusted

to

unity

when

the

NOR-

MAL-SMOOTH

switch

is

in

the

NORMAL

position.

Matches

the

vertical

output

amplifier

gain

to

the

oscilloscope

CRT

deflection

factor.

(Does

not

affect

the

internal

Digital

Gain

accuracy.)

When

the

sampling

head

contains

a

trig-

ger

pickoff

circuit,

selects

the

signal

from

Channel

A

or

Channel

B

input

circuit.

De-

livers

the

signal

to

the

TRIG

OUT

jack

on

the

front

panel.

(Such

signals

are

use-

ful

for

externally

triggering

a

sampling

sweep

unit).

It

also

selects

an

internal

vertical

signal

facsimile

from

channel

A

or

B

for

use

in

internal

triggering

of

real-

time

time-base

units.

Varies

the

time

position

of

CH

B

display

over

a

range

of

af

least

10ns.

Time

coincidence

will

depend

upon

the

time

difference

of

sampling

heads

and

sampling

head

extender

cable

units.

The

Channel

A

facsimile

signal

(the

same

Memory

output

signal

that

drives

the

Ver-

tical

Amplifier)

is

available

at

this

con-

2-3

Operating

Instructions—Type

3$2

TEKTRONIX

©

(—

\

TYPE

3S2

SAMPLING

UNIT

A

POSITION

B

POSITION

DC

OFFSET

+1V

DUAL-TRACE

DC

OFFSET

+1V

CHA

CHB

A

VERT

B

HORIZ

A+B

pot

GAIN

B

DELAY

NORMAL

SMOOTH

DOT

RESPONSE

©

TRIG

OUT

RESPONSE

©

~CT)s

©

os

ICAL

LZY-y,

P59

20

10

a

S

QW

POSITION

200

OF

PORTLAND,

OREGON,

U.S.A.

(—

y)

(a

—))

mVOLTS/DIV

mVOLTS/DIV

TYPE

S-1

TYPE

S-1

SAMPLING

HEAD

SAMPLING

HEAD

aN

aN

“a

ra]

Q

9

G0

=

—

RISETIME

RISETIME

$350ps

502

£350ps

{

TEKTRONIX

®

+5V

MAX

LTEKTRONIX

®

S

ey

GND

VERT

OUTPUTS

.

2v/DIV

A

10KQ

OFFSET OFFSET

X10

10KQ

X10

10KQ

Fig.

2-2.

Control

Setup

Chart.