Tektronix R485 Betriebsanleitung

Tektronix, I

P.O. Box

500

Beaverton, Oregon

97005

070-1193-00

TEKTRCNI»

485/R485

OSCILLOSCOPE

SERVICE

TRUCTION

MAN

Number

473

485/R485Service

TABLE

CONTENTS

SECTION 1 SPECIFI

CAT

ION

Page

SEC

TION

3 CIRCUIT DESCRIPTION (cont)

Page

Introduction

1-1

Focus

Restorer

Vertical

Deflection

System

1-1

Beam

Current

Limit

Probe

erformance

1-3

Power

Supply

Shutdown

Caused

and

B Triggering 1-3 Excessive

Beam

Current

3-14

Horizontal

Deflection

-4

Control

Circuits

Calibrated

Sweep

Delay 1-4

Auto

Focus

Circuit

X-V 1-6

Calibrator

CRT

1-6

Calibrator

1-6

Other

Characteristics 1-6 SECTI

INTENANCE

EnvironmentalC

racteristics 1-6

Introdu

ction

4-1

Cover Removal

and

Rainstallation 4-1

SECTION 2 OPERATING INSTRUCTIONS Cleaning 4-1

Lubri

cation

-2

General 2-1 Visual Inspection

4.3

Preliminary

Inform

ation

2-1

Semiconductor

Checks

4-3

Controls

and

Connections

2:1 Recalibration 4-3

Front

Panel 2-1 Troubleshooting 4-3

Rear Panel

2-4

troduction

4.3

Bottom

Side

2-4

Troubleshooting

Aids 4.3

Circuit

Boards

4-3

Troubleshooting

Equipment

4-5

Troubleshooting

Techniqu

4-6

SECTION 3 CIRCUIT DESCRIPTION Special

Troublesho

oting

Infor

mation 4-7

CorrectiveMaintenance 4-11

ntroduction

3-1 Obtaining R

eplacement

Parts

4-11

Attenuator

3-1 Soldering

Techniqu

4-11

1 Megohm BufferAmplifier 3-1

Component

Replacement

n Overload

Protect

ion

Circuit

Board

Replacement

4-12

Vertical Preamplifier 3-1 Timing Board Removal

4-12

Transformer

Board

Removal 4•13

Signal

Channel

Switch

3-2 Inv

erter

Board

Removal

4-14

Inter

nal Trigger Amplifier

3-2

Semico

ndu

ctor

Replacement

4-14

Main Vertical

Amplifier

3-2

Circuit

Board

Pins

4-14

Scale

Factor

Readout

3..J

End

Lead Pin

Connectors

4-15

Vertical

Mode

Control

3.3

Cathode

Ray

Tube

Rep

acemen

4-15

Axis

3.3

Repackaging

for

Shipment

4-15

A Trigger Amplifier

3-3

lnt

erboard

C9mb

Connection

Locations

4-16

EXT

Trigger

Identify

3-3 SECTION 5

CAL

BRAT

ION

A Trigger

Generato

3-4

B Trigger

Generator

3-4

troduction

5-1

and

B Sweeps

3-4

TEKTRONIX FieldService 5-1

Horizonta

Amp

lifier

3-6

Using

is Procedure 5-1

Horizontal

Control

3-6

Test

Equipment

Required 5-1

Power

verter/Regula

tor

3-6 Special Calibration

Fixtures

5-1

Line

Filter

3-6

libration

Equipment

Alternatives

5-4

Line

Input

Circuit

3-6

Performance

Check

5-4

Start

Network

3-7

Calibration

Procedure

5-8

Inverter

3-8

Inverter

/Regulat

3-8

Inverter

Current

Limiting

Circuit

3-8

SECTION 6 RACKMOUNTING

Overvoltage

Stop

Circuit

3-8 I

ntroduction

6-1

Line

Stop

Circuit

and

Surve

Limiting 3-8 Rack Dimensi

ons

6-1

Procedure

for

Converting

the

485

Slide

Out

Tracks

6-1

Operatio

3-9

Mounting

Procedure

6-1

Low

Voltage Supplies

3-9

Alternate

Rear

Mounting

Methods

6-2

Power

Supply

Protection

Circuit

3-10

Removing

Installing

the

strument

6-2

Stop

Monostable

Slide

Out

ack

Lubrication

6-2

Balance

Node

3.•

Overcurrent

Protection

SECTION 7 ELECTRI

CAL

PARTS

LIST

Low

Line

Voltage

Protection

Samp

ling Period

Timer

and

Over- SECTION 8 DIAGRAMS

AND

CIRCUITBOARD

ltage

Protection

CRT

Circuit

ILLUSTRATIONS

Filament

Voltage 3-

High Voltage Supplies 3-

Anode

upply

SEC

TION

MECHANICAL

PARTS

LIST

Cathode

Supply

3-12

Cathode

Regulator 3-12

Grid

Restorer

CHANGE

INFORMAT

ION

REV.

B, MAR.

1976

485/A485

rvrce

48S

onable

Osc:

OSC:Ope.

Section 1

-485

R485

Service

SPECIFICATION

Introduction

The

485

a general-purpose, environmentalized,

high-performan

ce,

portable,

wide-band

lloscope which

has a

dua

l-channel vertical amplifier

wit

h selectable

input

impedance (DC

350

MHz

bandwidth

with

input

impedance; DC

250

MHz

bandw

dth

wit

h 1

input

impedance).

The

485

has a 1 ns sweep rate, stable triggering

bandwidth limits and calibrated X-Y capabilities.

Del

ayed

sweep

has

calibrated

delay

time,

can

trigger

after

delay

and

can be displayed with

the

intensified main

sweep in an

alternate

sweep switching display. Additional

features are X

X100

probe

scale factor

readout,

8 div

div graticule ar

ea,

sma

spot

size

and

high writing rate.

A 20 MHz

bandw

dth

limiter, 1

and

1 kHz fast-rise

cali

brator

and

autofocus

are

also included.

inp

automatically disconnected

from

excessive voltages.

external trigger view feature

also provided.

e 485-1

and

485-2 have

external trigger view.

The

485-2

has

only

n vertical

input

impedance.

ELECTRICAL

CHARACTERISTICS

VERTI

CAL

DEFLECTION SYSTEM

iden

tica

l channels)

lectable

Input

Imp

eda

wit

hin

0.5

VSWR

,s;;:;

1.25:1

5 mV/div

and

10 mV/div,

1.15

:1 from

5 V/div

350

MHz.

M.Q

withi

n 1%

ralleled

approximately

pF.

Bandw

idth

1 and Riset

ime

(VA

ABLE

gain

LIBR

From

n Terminated Source

°C

+35°C

From

terminated

source -

°C

+35°C.

n DC

east

z, 1 ns

least

250

MHz, 1.4 ns

1Bandw

idt

h (BW) measured

-3

down

2Risetime calculated

from

0.35

From

+35

°C

°C, BW

300

z f

n and

200

for

1 M

3See Fig. 1-1

for

effect

VAR

ABLE

gain

trol.

REV C.

MAR

1979

nput

Coupling

lection

AC; DC; GND (provides

zero

reference, precharges

coupling c

apa

citor,

disconnects

n load in

model.

ower

- 3

Point

(AC

coup

from

source)

50 n inpu

1 kHz or less.

input

, 10 Hz

less.

Defle

ion F

actor

5 mV/div

5 V/div in

calibrated steps

-2-5

sequence). accurate within 2%. Uncalibrated, continu-

ously variable between steps

least

.5 V/div.

Lights

edge

knob

skirts indicate

correct

deflection

factor

for

10X

and

100X

probes.

Gain can be recalibrated

front

panel. 1

M.Q

BAL

avai

lab

bottom

panel

eliminate

step

attenuator

shift above

/div, in

the

mode.

Display Modes

Channel 1; Alternate; Chopped (approximately 1 MHz

rate);

Added;

X-Y

(CH

1 - Y

and

CH 2

-X);

Channel 2

Inverted).

Tri

gger

Sour

Normal (displayed signal). Channel 1

Channel 2

signal.

500

400

300

,_/

---

----

200

ICAL

BANDWIDTH

VARIABLE

GAI

SET

TING

100

50%

100

Percent

CAL

Gain

Fig. 1-1.

Typ

ical

Bandwidth

n vs.

Var

ble

Gain Setting (varies

considera

y depending

nstrument

SN)

1-1

Specification-485

R485

Service

100

60V

40V

20V

1 V 0.1 ms

NONRECURRING

SIGNALS

THIS

AREA

NOT

TRIP

THE

DISCONNECT

1 ms

TYP

CAL

PROTECTION

------It--

DISCONNECT

CHARACTERI

TIC

0.1 s

5 V

1 s

from

Start

Applied Vol

tag

Fig. 1-2. Typical

n Protec

tion

Disconnect Characteristic.

50 n Protection

Internal detection

circuitry

automatica

y disconnects

excessive

signals

V. The disconnected

condition

indicated, a

manual reset.

Maximum I

nput

Voltage

50 U Disconnect occurs

r voltages that exceed approx-

imately 5 V RMS continuous

watt-second

instantaneous voltages

5 V

Repeated application

voltages

excess

50 vo

and greater than

1 watt-second

will

cause

deterioration

K1S1

relay contacts, due

arcing.

Signa

excess

150

volts will damage the instrument.

1 MU-DC coupled 2

V (DC + peak AC), 5

V P

-P

1 kHz. AC cou

ed 5

V (DC + peak AC), 500 V P-P

1 kHz.

Common Mode Rejection

Added

Mod

Channel 2 inverte

least 10:1 at

MHz

for

8-division signal a

fter

adjusting CH 2 gain

for

best CMR

kHz

and 20 mV

/div.

1-2

Bandwidth Limiter

Lim

its

appr

imate

20 MHz the Vertical

d Internal

igger signals.

Channel Isol

ation

At least

:1 at

350

Ext

Trigger Display (R485 and

485

onl

Momentary pushbu

ERT

MODE

area

enabl

splay

T A Trigger when A source is

EXT

tion.

tion factor

approximately 50 mV

/div

Risetime

approximately 1.5 ns. Delay match

CH 1

or CH 2

input

is wi

in 0

at 50% amplitude.

Triggering l

eve

0.5

div

center-screen.

Probe Power

4-pin connectors at

the

rear

the instr

ent

provide power suitable

for

tional

tiv

bes

such

the P

620

®I

Specification-485/R485

Service

PROBE PERFORMANCE

(Prob

are

Optional

Accessories)

Temperature Range

wer

Bandwidth

for

thi

Input

-3

point

with

485

width

Type

Atten

. Impedance (max

imum

) (minimum) Specification

For

Use

With

Input

P6056 010.-6056-03 - 6 ft.

010-

6056

- 9

ft.

,ox

soon

1 pF 200 Hz

350

MHz

010-6057-

- 6 ft. -

°C to +

°C

P6057

100X

1 pF

Hz 350

MHz

010

-6

057

- 9 ft.

100

P6201 0°C

°C

010

-6201-01 - 6 ft. Plug-

10X

1.5

1 Hz

330

MHz

(FET

Prob

On 1

00X

1 Mn < 1.5

For

With

1 Mn I

nput

010

-60

- 3 1/2

P6053A

010

-6053-13 - 6 ft.

010

6053

- 9

A and B

IGGERING

igger

Mod

NORMAL.

Sweep runs

only

when triggered.

AUTOMATIC.

,ox

eep

free-runs

the

absence

a triggering signal

and

for

gnals

below

20 Hz.

GLE SWEEP.

Sweep runs one time

the

rst triggering event after

pressing the reset selector.

B Trigger Mode

BRUNS

AFTER

DELAY

TIME.

Starts automatically at

e end

the delay time.

TRIGGERABLE

AFTER

DELAY

TIME.

Runs wh

gge

red.

e B (delayed) sweep runs

once, in

eac

these modes,

following

the A sweep

delay time.

REV.

B, AUG. 1977

9.5

pF 250

pF 1 Hz 250 MHz -

°C

+35

°C

13.5

200 MHz

Time

A and B Trigger Sensitivity

Trigger

Mod

MHz

350

DC I

0.3

div

1.5 div

Ext

20mV

100

AC Signals below

are

attenuated.

Reject Signals below

kHz

are

attenuated.

HF Reject

gna

bel

Hz and above 50

are

attenuated.

eve

and

Slope

Internal, permits selection of

tri

ggering

point

at any

leve

on the positive and negative slope

the d

played

waveform.

Ext

ernal, level

stable through at least

±0.5 V

for

eit

her

polar

(±

5 V

for

..;-

10).

A Source

Int

ernal, Lin

ternal, External

..;-

,o,

1-3

Specification-485/R485

Service

B runs after Delay Time, Internal, External, External

~10.

External Inputs

paralleled by approximately 20

pF.

Maximum

input

voltage

500

(DC

+ peak

AC)

500

V p.p

1 kHz.

Jitte

Less than 0.1 ns

350

MHz

and

1 ns/div.

HORIZONTAL

DEFLECTION

Time

Bas

e A and B

1 ns/div

0.5

s/div in 27 calibrated steps (1·2·5

sequence). Uncalibrated, A

continuously variable

between steps and

least 1.25 s/div.

Time B

ase

A and B Sweep Accuracy (Center 8

scree

n division

Sweep

Rate

+15°C

+35°C - 15°C

+55°C

1 ns

to 20 ns/div ±3% ±5%

ns/div

0.1 s/div ±2% ±4%

0.2

s/div

0.5

s/div ±3% ±5%

splay Modes

A, A INT

El--lsified

during B delayed, ALTernate display

A INTEN and B (delayed sweep). Only A sweep

displayed

for

A sweep rates

1, 2 and 5 ns/div.

1-4

Minimum

Sweep

Holdoff

Trigger H

oldoff

Norm

detent)

Time

Setting

1 ns/div

0.1 µs/div

0.2

µs/div

0.5

µs/div

0.5

s/div

A Trigger

Holdoff

Less than 0.4 µs.

Less

than

1.0 µs.

Less

than

2 times the

A TIME/DIV

sett

ing.

Adjustable control permits a stable presentation of

repet

itive complex waveforms.

The

control

covers

least

the

one

full sweep

for

sweeps faster than

0.2

s/div.

B Ends A

The

A sweep

reset

the

end

the

B sweep

allow

the fastest possible sweep re

pet

ition rate for increased

trace intensity in the delayed sweep mode.

CALIBRATED

SWEEP

DELAY

Delay

Time

Range

9.9

times

the

y Time/Div settings

ns/div

0.5

s/div.

Differential Delay Time

curacy (+15°C

+35°C)

Exclude

e first (above 0.0)

1.0

turn

the

first

the

dial.

Setting

ns/div

and

20 ns/div

ns/div

1 ms/div

2 ms/div

0.5

s/div

± (1%

mi::asurement

+0.2%

full scale3)

± (0.5%

measurement

+0.1%

full scale)

(1%

measurement

+0.1%

full scale)

3Full scale is

lOX

the

Delay Time/Div

Setting.

!'!

::,

3.0

2.0

1.0

SPECIFIED

DIFFERENTIAL

DELAY

ACCURACY

. --S

IZE

MEASUREMENT

\ \

1\-.

' '

r-,...,.._

I I I I I

----

.......

,.__

nstdiv

ns/d

\ ~r------

........

ms/d

0.5

s/d

iv -

r--

~so

ns/div

ms/div

~:t

(0.5

measurement

+0.1%

full

sc:ale)

2 3 4 5 6 7 8 9

DIFFERENCE

Between

Two

Dial

Readings.

Major

D.T

.P.

Divis

ions

Fig. 1-3. Specified Differential Delay

Accuracy

vs. Size

Measure-

men

Jitt

Less

than

005

% (one

part

20,0

00)

scale plus

0.2

ns. (Wrap-around cover

must

place.)

X·Y

Full Sensitivity

(CH

1 V

ert,

CH 2 H

orizonta

l.) 5 mV/div

5 V/div

calibrat

steps

(1-2-5 sequence)

accurate

within 2%.

Gain

can

recalibrated

front

panel.

Y Performance

Identical

CH 1. See Vertical Deflection.

X-Axis Bandwidth

4 MHz (with

div reference signal).

X-Y

ase

Match (Fu

and

Limit)

Within 3°

X-Gain Match

5°C

+35°C:

°C

+55°C:

Specification-485/R485

Service

CRT

TEKTRONIX

CRT

4-inch rectangular

tube;

divisions (0.8

cm/d

)

display area. P31

phosphor

normally

supplied; P11

optional

without

extra

charge.

kV accelerating

potential.

Photographic Writing Speed

least 3 div/ns for

standard

P31

phosphor;

least

6 div/ns

for

opt

ional P11

phosphor

(with

the

TEKTRONIX C-31-R

Camera

and

POLAROID

10,000

ASA film).

Auto

Focus

Autom

atically maintains beam

foc

us for all intensity

tting

s. (Intensified z

and

EXT Z axis are

not

auto

focused).

Graticule

Internal,

parallax. Variable

ge-lighting. Markings

for

measurement

risetime. Graticule

dark

with

illumination

off.

Beam Fi

nder

Limits display within graticule area.

External Z-Axis

Risetime

ns. Inp

500

+o.2 V (DC

MHz)

blanks trace

average

intensity.

+2 V (DC

blanks

maximum

intensity

trace.

Beam

Current

Lim

Automatically limits

e average beam

current

protect

the

CRT

phosphor.

(Limi

average

current

µA

for

sweep rates faster

than

ms/div; 5

µA

for

ms/div

and

slower sweep rates

and

for

X-Y

. Backup system

shuts

down

power

supply

if average

current

reaches

approximately

µA.)

1-5

Specification-485

R485

Service

CALIBRATOR

Two

Frequency

Fast-Rise

Calibrator

Accuracies +

°C

+35°C -

°C

+55°C

5 V amplitude

load

0.5

V amplitude

n±0.5% load

mA amplitude

optional

BNC

acces-

ry current loop

Selectable Frequency

1 MHz and 1 kHz

Output

Resista

nce

450U

Risetime

0.5% 1%

1% 1.5%

1.5

0.25% 0.5%

Positive edge into

n, less

than

1 ns. Overshoot

and

ringing less than 2% into

1 GHz bandwi

dth.

kHz

Duty

Cycle

49.8

50.2

OTHER

CHARACTERISTICS

Signal

Output

Positive gates from

both

time bases (approximately 4 V).

and a positive-going Sawtooth from Time Base A

(approximately 10 V). Gates and

Sawtooth

are approxi-

mately

0.5

V amplitude into

Power

Requir

ement

Two-position line

volt

age sele

115

V (90 V to

136 V) a

230 V (180 V to 272 V)

440

Hz.

watts maximum at 115 V and 60 Hz.

0.9

A maxi

mum

115

V and

Hz. Line fuse: 3 A fast.

Coo

ling

Quiet,

ere

rced

-a

ir ventilation. Fan speed

increases smoothly wi

increasing ambient temperature.

ENVIRONMENTAL

CHAR

TERI

STICS

Amb

ent

Temp

era

tur

Operating: - 15°C to +

°C

Storage: -

°C

1-6

Altitude

Operating:

000

feet

. Maximum a

owa

e ambient

temperature decreased

1°C per

1000

feet

from

5,000

000

feet.

Nonoperating:

50,000

feet.

Vibration5

Oper

ing:

minutes along each

the

three axis,

0.025 inch peak-to-peak displa

cement

(4 g's

Hz)

10 Hz in 1-

minute

cycles.

Shock

Operating and

nope

rating:

g's,

one

half sine,

-ms duration, 2 shocks per

axis

each direction for a

total

shocks.

Electromagnetic

Interference

{With

485

EMI

modification option

4).

Meets inter-

ference requir

ements

-1-6

180

: power line

conducte

150

kHz

z; radi

ated,

150

kHz

GHz.

Humidity

Operating and Storage: 5 cycles (

120

hours)

relative humidi

referenced

MIL-E-16400F {par.

5.9

through 4.5.9.5.1, class

Dimen

sions

and

Weight

Height: 6 and

9/16

inches.

Width: {with handle)

inches.

Depth (including panel cover):

1/2 inches.

Depth (handle extended): 20 and 5/8 inches.

t weight {without ac

ssory case and panel cover):

pounds.

Net weig

(with panel

ver. accessory case

and

essories): 24 pounds.

omest

ic shipping weig

: 31 pou

ort-packed weight:

pounds.

5R485 s

trapped

table

. not

mount

rack.

Section 2

-485

R485

Service

OPERATING

INFORMATION

General

To effectively use the

485,

the operation

and

capabilities

the

instrument

must

be known. This section describes

the

operation

the

controls

and connections

and

gives

first-time and general operating information.

PRELIMINARY

INF

ORMAT

ION

Operating Vo

age

WARNING

This instrument is designed

for

operation from a

power

source

with

its

neutral

near earth

(ground)

potential

th a separate safety-earth

conductor.

not

intended

for

operation from two

phases

a multi-phase system,

across the

legs

single-phase, three-wire system.

The

485

can

operated

from

either

115

V or

230

nominal line voltage source,

220

V external

battery

pack. The Line Voltage Selector switch

the rear panel

converts this

instrument

from

one

operating voltage

the

other.

Power Cord Conductor Identification

Conductor Color

Alternat

e Color

Ungrounded (Line) Brown Black

Grounded (Neutral) Blue

Grounding (Earthing) Green-Yellow Green-Yellow

This instrument

may

be damaged

operated

with

the

Line

Voltage Selec

tor

switch set

incorrect posi-

tions

for

the line voltage applied.

115 V

230

V 90-136 V

180-272 V

The

485

designed

used with a three-wire AC

power system.

the t

two-wire

adapter

used

connect this

instrument

a two-wire AC power system, be

sure

connect

the ground lead

the

adapter

eart

(ground). Failure

complete

the ground system may allow

,he chassis

this

instrument

be elevated

abo

ve ground

potential and pose a sh

k ha

REV

. C,

MAR.

1977

Operating Temperature

The

485

can

operated

where

the

ambient air

temperature

between

-15

°C

and

+55

°C (+5° F

and

+131°F). This instrument

can

be stored in ambient

temperatures between

-55°C

and

+75°C

(-67

° F

and

167

°F). A

fter

sto

temperatures

beyond

the

opera-

ting

mits, allow

the

chassis t

emperatu

come

within

the

operating limits before power

applied.

The

485

cooled by

air

entering through the air filter

the

rear panel and exiting through

the

holes

the

sides.

Adequate clearance must be provided

these locations.

Allow

east

one

inch clearance behind

the

air

ter

and

least

one

inch

the sides.

A thermal

cutout

in this instrument provides thermal

protection and disconnects

the

power

the

instrument if

the internal

temperature

exceeds a safe operating level.

Power

automatically re

stored

when

the

temperature

returns

a safe level. Clean

the

air

filter periodically; a

y filter prevents adequate air flow

into

the instrument.

CONTROLS AND CONNECTORS

General

The

major controls

and

connectors

for

operation

the

485

are

locat

the

front

panel

the instrument. Some

auxiliary functions are provided

e side,

top,

bottom

d rear panel. To make full use

the capabilities

this

instrument,

the

operator

should

be familiar with the

function and use

each of these

contro

and

connectors.

A brief descrip

tion

each

contro

l and

connecto

given

here.

Front

Panel

POWER Pushb

utton

Turns

instrument

off.

CAL 5 V Connector BNC

connector

for square-wave

voltage calibrator

output

signal.

FREQ

Pushbutton

Selects

one

two

frequencies

kHz

1 MHz) for

the

fast-rise

calibr

ator

signal.

INTENSITY

Cont

rol Controls intensity

writing beam.

B INTENSITY Provides additional intensity

con

•

Control trol

the

B SWEEP.

2-1

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