Tektronix TEK 222 Manuale utente

E-

SERVICE

063-0066-00

MANUAL

Product

Group

222

Digital

Storage

Oscilloscope

Preliminary

Service

THE

FOLLOWING

SERVICING

INSTRUCTIONS

ARE

FOR

USE

QUALIFIED

PERSONNEL

ONLY.

AVOID

PERSONAL

INJURY,

NOT

PERFORM

ANY

SERVICING

OTHER

THAN

THAT

CONTAINED

OPERATING

INSTRUCTIONS

UNLESS

YOU

ARE

QUALIFIED

SO.

REFER

OPERATORS

SAFETY

SUMMARY

AND

SERVICE

SAFETY

SUMMARY

PRIOR

PERFORMING

ANY

SERVICE.

First

Printing

April

1989

Tektronix.

COMMITTED

EXCELLENCE

1989

Tektronix,

Inc.

All

rights

reserved.

Contents

this

publi-

cation

may

not

reproduced

any

form

without

the

written

permission

Tektronix,

Inc.

Products

Tektronix,

Inc.

and

its

subsidiaries

are

covered

U.S.

and

foreign

patents

issued

and

pending.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

ane

are

registered

trademarks

Tektronix,

Inc.

Printed

U.S.A.

Specification

and

price

change

privileges

are

reserved.

LIST

ILLUSTRATIONS

LIST

TABLES

OPERATORS

SAFETY

SUMMARY

SERVICING

SAFETY

SUMMARY

222

DSO

Preliminary

Service

TABLE

CONTENTS

SECTION

SPECIFICATIONS

INTRODUCTION

.............

RECOMMENDED

PERFORMANCE

CHECK

SCHEDULE

.................

ELECTRICAL

SPECIFICATIONS

............

VERTICAL

DEFLECTION

SYSTEM

..............0.0.

ENVIRONMENTAL

SPECIFICATIONS

............

MECHANICAL

SPECIFICATIONS

............

BATTERY-CHARGER

ADAPTER

vias

inn

nscensegen

EXTERNAL

SUPPLY

VOLTAGE

...................

FIRST

TIME

BATTERY

OPERATION

.................

START-UP

.................,

VIEWING

SIGNAL

QUICKLY

Page

TIPS

BATTERY

CARE

......

2-2

BATTERY

REPLACEMENT......

2-3

SECTION

BLOCK

DIAGRAM

OVERVIEW

INTRODUCTION

.............

3-1

ACQUISITION

SYSTEM

........

3-1

TIME

BASE

..................

3-4

PROCESSOR

SYSTEM

........

3-4

DISPLAY

SYSTEM

............

3-6

BATTERY

CHARGER

RECTIFIER

.................,

3-9

POWER

SUPPLY

............

3-10

SECTION

PERFORMANCE

CHECK

PROCEDURE

INTRODUCTION

.............

4-1

TEST

EQUIPMENT

REQUIRED

..................

4-1

PERFORMANCE

CONDITIONS

................

4-1

PERFORMANCE

CHECK

INTERVAL

.............0.000.

4-1

PREPARATION

...............

4-1

INDEX

PERFORMANCE

CHECK

PROCEDURE

.........

4-5

DISPLAY

CHECKS

..............

4-6

INITIAL

CONTROL

SETTINGS

...

4-6

PROCEDURE

................

4-6

VERTICAL

...............0000

4-7

INITIAL

CONTROL

SETTINGS

...

4-7

PROCEDURE

................

4-7

HORIZONTAL

..................

4-11

INITIAL

CONTROL

SETTINGS

4-11

PROCEDURE

...............

4-11

TRIGGER

................000,

4-12

INITIAL

CONTROL

SETTINGS

................,

4-12

PROCEDURE

...............

4-12

222

DSO

Preliminary

Service

Page

SECTION

ADJUSTMENT

PROCEDURE

INTRODUCTION

.............

5-1

TEST

EQUIPMENT

REQUIRED

...........000005.

5-1

LIMITS

AND

TOLERANCES

.....

5-1

ADJUSTMENTS

AFFECTED

CIRCUIT

BOARD

REPLACEMENT

............--

5-1

PREPARATION

FOR

ADJUSTMENT

...........-05.

5-1

PROCEDURE

STEPS

.............

5-2

PREPARATION

.............-.

5-2

ADJUSTMENTS

............5.

5-2

SECTION

MAINTENANCE

STATIC-SENSITIVE

COMPONENTS

.............055

6-1

PREVENTIVE

MAINTENANCE

.....

6-3

INTRODUCTION

.............

6-3

INSPECTION

AND

CLEANING

6-3

LUBRICATION

.............5.

6-5

PERIODIC

READJUSTMENT

....

6-5

TROUBLESHOOTING

...........

6-6

INTRODUCTION

.............

6-7

TROUBLESHOOTING

AIDS

....

6-7

TROUBLESHOOTING

TECHNIQUES

...............

6-7

CORRECTIVE

MAINTENANCE

....

6-8

INTRODUCTION

.............

6-8

MAINTENANCE

PRECAUTIONS

..............

6-8

REPACKAGING

FOR

SHIPMENT

...........0.0000.

6-8

REMOVE

AND

REPLACE

PROCEDURES

.................

6-9

TOP

CASE

REMOVAL

.........

6-9

Page

PROBE

REMOVAL

AND

REPLACEMENT

............--

6-9

FRONT

PANEL

SWITCH

BOARD

REMOVAL

..........00000005

6-11

TOP

PANEL

SWITCH

BOARD

REMOVAL.........000000005

6-11

POT

BOARD

REMOVAL

......

6-11

CRT

REMOVAL

.............

6-11

POWER

SUPPLY

BOARD

REMOVAL............0-000:

6-12

CPU/DISPLAY

BOARD

REMOVAL.........000000005

6-12

ACQUISITION

BOARD

AND

MAIN

BOARD

REMOVAL

.....

6-12

ACQUISITION

BOARD

REPLACEMENT

.............

6-12

ACQUISITION

BOARD

AND

MAIN

BOARD

REINSTALLATION

...........

6-12

CPU/DISPLAY

BOARD

REINSTALLATION

...........

6-12

POWER

SUPPLY

BOARD

REINSTALLATION

...........

6-12

CRT

REINSTALLATION

.......

6-12

POT

BOARD

REINSTALLATION

...........

6-12

CASE

REASSEMBLY

.........

6-12

SECTION

OPTIONS

AND

ACCESSORIES

INTRODUCTION

.............

7-1

STANDARD

ACCESSORIES

....

7-1

OPTIONAL

ACCESSORIES

.....

OPTIONS

.............00

00s.

FIELD

ACCESSORY

KIT

PARTS

LIST

.............0005

7-1

SECTION

8—

REPLACEABLE

PARTS

222

DSO

Preliminary

Service

LIST

ILLUSTRATIONS

Figure

Page

1-1

Maximum

common-mode

voltage

versus

frequency

derating

curve..............

1-5

2-1

External

Power

Input

....

0.2...

ccc

cece

cence

eee

eeeeeneennenes

2-1

3-1

Simplified

block

diagram

the

222

DSO

..........

ccc

eee

eeees

3-2

Floating

Acquisition

System

1.2.0.0...

ccc

cece

eee

neeeeeeunees

3-3

Processor

System

simplified

block

diagram

...........

0...

cece

eee

ccc

eee

eees

3-5

3-4

Display

System...

...

ccc

cece

eee

cece

eeennaannnnns

3-7

3-5

Battery

Charger

block

diagram

.............

cece

ccc

cece

eee

eeeeeauneeeus

3-9

3-6

Power

Supply

block

diagraM

.............

cece cece

eee

eeneeeeeunnees

3-10

4-1

RS-232

interconnection

cable

wiring

...........

0.00

ccc

cece

eee

ence

eeuenes

4-4

4-2

Trigger

Jitter

CHECK...

1...

ccc

cece

cence

eee

eens

enetennenns

4-14

5-1

Rear

Panel

adjustments

........

0...

cece

ccc

cee

eeeneenenneens

5-3

5-2

Top

accessible

adjustments

.......

0...

ccc

cee

cece

eee

ence

eneeeneeenns

5-4

5-3

CH1

and

CH2

Input

Compensation

..............

ccc

cece

cee

eee

cence

5-5

5-4

Clock

Delay

adjustment

............

cece

eee

cece

eee

eceaceneeeedaes

5-6

6-1

Circuit

board

locations

........

0...

cece

cee

cece

eeennnneunees

6-10

Table

Page

4-1

Test

Equipment

Required

.........

0...

cece

ene

nnneeeeeennns

4-2

VOLTS/DIV

Accuracy

Settings

............

0...

ccc

ence

unnns

4-9

6-1

Relative

Susceptibility

Static-Discharge

Damage

................

ccc

cece

eee

6-1

6-2

External

Inspection

Checklist

.............

ccc

cece

eee

cece

eeeeeeeenns

6-3

Internal

Inspection

Checklist

...........

00.

cece

eee

eeeeeeeuneues

6-4

222

DSO

Preliminary

Service

OPERATORS

SAFETY

SUMMARY

The

safety

information

this

summary

for

operating

personnel.

Warnings

and

cautions

will

also

found

through-

out

the

manual

where

they

apply.

Terms

this

Manual

CAUTION

statements

identify

conditions

practices

that

could

result

damage

the

equipment

other

property.

WARNING

statements

identify

conditions

practices

that

could

result

personal

injury

loss

life.

Terms

Marked

Equipment

CAUTION

indicates

personal

injury

hazard

not

immediately

accessible

one

reads

the

markings,

ora

hazard

property,

including

the

equipment

itself.

DANGER

indicates

personal

injury

hazard

im-

mediately

accessible

one

reads

the

marking.

Symbols

this

Manual

Indicates

where

applicable

cautionary

other

information

found.

For

maximum

input

voltage

ratings,

see

the

Specifications.

SERVICING

SAFETY

SUMMARY

FOR

QUALIFIED

SERVICE

PERSONNEL

ONLY

Refer

also

the

preceding

Operators

Safety

Summary

Not

Service

Alone

not

perform

internal

service

adjustment

this

product

unless

another

person

capable

rendering

first

aid

and

resuscitation

present.

Use

Care

When

Servicing

With

Power

Dangerous

voltages

exist

several

points

this

product.

avoid

personal

injury,

not

touch

exposed

connections

components

while

power

on.

Disconnect

power

and

remove

the

battery

before

removing

protective

panels,

soldering,

replacing

components.

Section

1—222

DSO

Preliminary

Service

SPECIFICATIONS

INTRODUCTION

Performance

characteristics

given

the

Electrical

Specifications

apply

when

the

instrument

has

been

self

calibrated

within

5°C

the

ambient

temperature,

has

warmed

least

minutes,

and

operating

ambient

temperature

between

-10°C

and

+55°C

(unless

otherwise

noted).

Items

listed

the

Detailed

Specifications

are

verifiable

limits

that

define

the

measurement

capabilities

the

instrument.

Environmental

Specifications

are

given

and

Mechanical

Specifications

are

given

following

the

Electrical

Specifications.

RECOMMENDED

PERFORMANCE

CHECK

SCHEDULE

ensure

accurate

measurements,

check

the

per-

formance

this

instrument

every

2000

hours

operation

(once

each

year

used

infrequently).

repairs

are

made,

affected

circuits

may

need

readjusted.

ELECTRICAL

SPECIFICATIONS

VERTICAL

DEFLECTION

SYSTEM

Deflection

Factor

per

division

per

division

1-2-5

sequence.!

Vertical

Resolution

8-bits,

levels

per

division.

10.24

divisions

dynamic

range.'

Accuracy

-10°C

+55°C

+3%

(when

the

self

calibration

has

been

done

within

5°C

the

ambient

temperature).

1Performance

Requirement

not

checked

manual.

VOLTS/DIV

Variable

Control

Increases

the

deflection

factor

2.5

Aberrations

+6%,

-6%.

p-p

less.1

Measured

with

5-division

reference

signal,

from

50-2

source

driving

50-0

load

the

probe

tip.

Vertically

center

the

top

the

reference

signal.

Useful

Rise

Time

SEC/DIVx

1.6

Rise

time

limited

the

vertical

amplifier

response.

Useful

Bandwidth

—S

SAMPLE

Timebase

put

Useful-storage

bandwidth

limited

the

frequency

where

there

are

samples

per

sine-

wave

signal

period

the

maximum

sampling

rate.

This

yields

maximum

amplitude

error

5%.

Maxi-

mum

sampling

rate

MHz

per

division.

Accuracy

the

useful-storage-bandwiath

limit

measured

with

respect

6-division,

50-kHz

sine

wave.

REPETITIVE

0.5

ys/div

MHz.

ys/div

MHz.!

us/div

2.5

MHz.!

Bandwidth

limited

MHz

the

analog

system.

PEAK

DETECT

(ENV

and

CONT

ENV

acauisition

modes

per

division

and

slower)

Sine-wave

Amplitude

Capture

(5%

p-p

maximum

amplitude

uncertainty)

MHz.

1-1

Specifications

—

222

DSO

Preliminary

Service

Pulse

Width

Amplitude

Capture

(50%

p-p

maximum

amplitude

uncertainty).

100

ns.

A/D

Converter

Linearity

Monotonic

with

missing

codes.'

Position

Control

Range

divisions.

Input

Linear

Range

+20

divisions.

Balance

0.2

division

less

trace

shift

when

switching

between

VOLTS/DIV

switch

settings

when

the

ambient

temperature

within

+5°C

the

tem-

perature

which

the

last

self

calibration

was

done.

INVERT

Balance

0.4

division

less

trace

shift

when

switching

between

INVERT

and

non-INVERT

displays

when

the

ambient

temperature

within

5°C

the

tem-

perature

which

the

last

self

calibration

was

done.

Input

Current

2.5

less

(0.5

division

less

trace

shift

when

switching

between

and

GND

input

coupling

with

the

VOLTS/DIV

switch

per

division)".

Input

and

Input

Resistance

1MQ

+10%.!1

Input

Capacitance

pF.!

These

and

characteristics

include

the

probe.

Maximum

Rated

Input

Voltage

400

(dc

peak

ac)

800

Vac

p-p

kHz

less.1

'Performance

Requirement

not

checked

manual.

1-2

See

Figure

1-1

for

voltage

versus

frequency

derating

curve.

Maximum

Common-Mode

Potential

400

(dc

peak

ac).!

Maximum

Common-Mode

Potential

DC-to-1

kHz

800

peak-to-peak.!

kHz-to-100

kHz

See

Figure

1-1

for

voltage

versus

frequency

derating

curve.

Maximum

Potential

Between

Channels

800

(dc

peak

ac).!

Common-to-Ground

Capacitance

Less

than

150

pF.’

Common-Mode

Rejection

Ratio

DC-to-1

kHz

more.1

kHz-to-100

kHz

more.!

Isolation:

Channel

Signal

Channel

Signal

DC-to-10

MHz

more.!

Isolation:

Channel

Common

Channel

Common

DC-to-1

kHz

more.!

kHz-to-100

kHz

more.!

TRIGGER

SYSTEM

Internal

Sensitivity

0.5

division

MHz.

Level

+20

divisions.

External

Sensitivity

200

MHz.

Level

t2.3V.

Input

Resistance

1MQ

+10%.!1

Input

Capacitance

pF.!

Trigger

Jitter

S/div

ns/div

X10

MAG)

1/50th

division

ns.1

X10

MAG

1/Sth

division

ns.

HORIZONTAL

SYSTEM

Range

per

division

per

division.'

The

X10

MAG

control

extends

the

maximum

sweep

speed

per

division.

Displayed

Accuracy

t2%.

X10

MAG

+5%.1

Accuracy

over

divisions.

Sample

Rate

NORMAL

SEC/DIV

PEAKDET

(ENV

and

CONT

ENV)

MHz.!

REPETITIVE

ns/div

ws/div

MHz.1

ps/div

MHz.1

ACCURACY

0.01%.

Sample

accuracy

based

the

accuracy

the

20-MHz

oscillator.

'1Performance

Requirement

not

checked

manual.

Specifications

—

222

DSO

Preliminary

Service

Record

Length

512

data

points;

calibrated

points

per

division’.

POSITION

Control

Range

Start

the

first

division

and

end

the

tenth

division

can

positioned

past

the

center

vertical

graticule.

Displayed

Trace

Length

10.24

divisions.1

X-Y

OPERATION

Accuracy

Same

the

Vertical

system.1

Useful

Bandwidth

SEC/DIV

Hz.1

Skew

Between

and

ns.1

RS-232

INTERFACE

Maximum

Applied Voltage

(any

pin)

(dc

peak

ac).1

Baud

Rates

300,

1200,

2400,

9600;

0.1%

accuracy

based

the

microprocessor

clock.1

Signals

RD,

TD,

and

SGND.

SGND

connected

internally

EXTERNAL

TRIG

COM.

DSR

and

CTS

are

always

high,

and

DTR

and

RTS

are

ignored.1

Levels

Compatible

with

RS-232C.

1-3

Specifications

—

222

DSO

Preliminary

Service

EXTERNAL

POWER

REQUIREMENTS

Voltage

Range

Pin-to-pin

16.0

Vac

400

Hz.!1

Vdc.!

Either

Power

Pin-to-EXT

TRIG

COMM

RS-232

COMM

-0.5

Vac

peak.!

Current

ampere

maximum

when

charging

batteries.1

Maximum

Power

Consumption

watts

volt-amperes

(when

charging

batteries).1

INTERNAL

BATTERIES

Battery

Sealed,

lead-acid

battery."

Charge

Time

Three

hours

for

full

charge

with

oscilloscope

not

operating."

Battery

Excessive

Discharge

Protection

Instrument

operation

automatically

interrupted

when

battery

charge

drops

7.32

V.1

Typical

Operating

Time

Two

hours

maximum

sample

rate,

trigger,

and

auto

shutdown

defeated.

'Performance

Requirement

not

checked

manual.

1-4

Battery

Capacity

versus

Temperature

-15°C

20°C

30°C

55°C

80%

100%

110%

ENVIRONMENTAL

SPECIFICATIONS

Environmental

Requirements

Instrument

will

meet

the

requirements

Tektronix

Standard

062-2853-00,

Class

The

instruments

meets

all

the

following

MIL-T-28000D

requirements

for

Type

Ill,

Class

equipment,

except

where

noted

otherwise.

Temperature

Operating

-10°C

+55°C

14°F

+131°F).1

Nonoperating

-51°C

+71°C

(-60°F

160°F).1

Tested

MIL-T-28800D,

para

4.5.5.1.3

and

4.5.5.1.4

except

that

para

4.5.5.1.3,

steps

and5

are

performed

before

step

(-51°C

nonoperating

test).

Equipment

shall

remain

off

upon

return

room-ambient

temperature

during

step

Exces-

sive

condensation

shall

removed

before

operat-

ing

during

step

7.1

Altitude

4,570

meters

(15,000

feet).

Maximum

operating

temperature

decreases

1°C

per

1,000

feet

above

5,000

feet.1

Operating

Nonoperating

15,240

meters

(50,000

feet).1

Indice

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