Tektronix 485 Bedienungsanleitung

TABLE

CONTENTS

485/R485 Service

SECTION 1SPECIFICATION

Pogo

SECTION 3CIRCUIT DESCRIPTION (conti

p,,.

Introduc1ion

,.,

Focus

Restorer

3-13

V.tical

Deflection

SyRem

...

Beam

Current

Limit

3-14

Probe

Perlormanu

...,

Po_r

Supply

Shutdown

Ceused

tlOd

Triggerin;

Excessi.... Beam

Current

314

Horizontal Deflection

CRT

Control

Circuits

3-14

Calibrated

Sweep

Delay

Auto

Focu'

Circuit

3-14

X·Y

Calibrator

3-15

CRT

Calibrator

Other

CharacteriRics

SECTION 4

MAINTENANCE

Ell'lironmental

CharactMiRics

IntroduC1ion

4-,

Cover Removal

and

Reinstallation

4-,

SECTION 2OPERATING INSTRUCTIONS Cleaning

,.,

Lubrication

'.'

Gen

....

,.,

Visuallnlf)aC1ion

'·3

Praliminary

Information

,.,

Semiconductor

Checks

4-3

Controls

and

Connection'

'.,

Recalibration

'·3

Front

Pane!

,.,

Troublll$hootin;

Rear Panel

Introduction

'·3

Bottom

Side

Troublashootin;

Aids

'·3

Circuit

Board.

Troublashoo1in;

Equipment

Troubllt'ShOOlin;

Techniques

SECTION 3CIRCUIT DESCRIPTION Special

Troubleshooting

Information

4-,

Correcti

...

Mainter'anca 4-11

Introduction

3·'

Dblainillll

Replacament

Paru

4·11

n A

ttenuttor

3·'

Solderillll

Tachniques

4-11

1Megohm

Buffer

Amplifier

3·'

Component

Repl_ment

4-12

nOverload

Protection

3·'

Circuit

Board

Repl_ment

4·12

V.tical

Preamplif

•

3·'

Timin;

Board Removal 4-12

Transform"

Board

Remonl

4·13

Signal

Channel

Switch

3·'

InYartar

Board

Removal 4_14

Internal

Trigger Amplifiar

3·'

Semiconductor

Replacement

4-14

Main Vertical Amplifier

3·'

Circuit

Board

Pin'

4·14

Scale

Faetor

Readout

End Lead Pin

Connectors

4·15

Vertical

Mode

Control

Cathode

Ray

Tuba

Repl_ment

4-15

ZAxis 3·3 Rapachllillll

for

Shipmant

4·15

ATrig9er Amplifier

Inlarboard

C9mb

Connection

Loutions

4-"

AEXT Trigger

Identify

Triggoer

Gen

....

,or

SECTION 5

CALIBRATION

Tr.r

Generator

J.4

Introduction

5·'

and

Sweep,

J.4

TEKTRON

Field Sllt'Yiea

5.'

Horizontal

Amplifier

Usin;

Thi,

Procedure

5·'

Horizontal

Control

Test

Equipment

Required

5·'

Power

Inverter/Regulator

Special Calibration Filltures

5·'

Line

Filt.,

Calibrttion

Equipm""t

AII.,nalil/ft

Line

Input

Circuil

Perlormance

Check

Slart

Natwork

'.'

Calibration

Procedure

Inverter

nvart.,/R'lIulltor

lnvarter

Currant

Limitillll

Circuit

SECTION 6RACKMQUNTING

OvlltVoltage

Stop

Circuit

Introduction

,.,

L1na

Stop

Circuit

and

Surge

Limiting

Rack

Dimension,

,.,

Procedure

for Converting

the

485

Slida

Out

TtlICks

6·'

Operation

Mounlin;

Procedure

6·'

low

Volt.

Supplies

,.,

Alter"'te

RNr

Mounting

Methods

5·'

Power

Supply

Protaetion

Circui1

3·10

Removing

ln$larung

thaln$lrumant

,.,

Stop

Mono$lable

3·10

Slida

Out

Track

Lubrication

,.,

Balenea

Nod.

3·10

Overcurrant

Protection

3-12 SECTION 7ELECTRICAL PARTS LIST

Low

Line Voltage

Protaction

3·12

Samplin;

Period

Ti..-

and

Dver_ SECTION 8DIAGRAMS

AND

CIRCUIT BOARD

Voltage

Protection

3·12

CRT

Clfcuil

3-12

ILLUSTRATIONS

Filament

Voltage

3·12

His;,

Volt.

Supplies

3-12

Anode

Supply

312

SECTION 9

MECHANICAL

PARTS LIST

C,thode

SupplV 3-12

Cathode

Regulator

3·12

Grid

RlI$Iorar 3-13 CHANGE

INFORMATION

REV. B. MAR.

1976

Section

1--485/R485

Service

SPECIFICATION

Introduction

The

485/R485

ageneral-purpose, environmentalized,

high·performance, portable, wide-band oscilloscope which

has adual-channel vertical amplifier with selectable

input

impedance (DC

350

MHz

bandwidth with 50

input

impedance;

250

MHz

bandwidth with 1

Mil

input

impedance). The

485

has a 1 ns sweep rate, stable triggering

bandwidth limits and calibrated

X-V

capabilities.

Delayed sweep has calibrated delay time, can be triggered

aher

delay and can be displayed with the intensified main

sweep

an alternate sweep switching display. Additional

features are XtO, X100

probe

scale factor

readout,

8div

Xl0

div graticule area, small

spot

size

and

high writing rate.

MHz

bandwidth limiter, 1

MHz

and

1kHz last·rise

calibrator

and

autofocus are also included. The

input

automatically disconnected from excessive Voltages. An

external trigger view feature

also provided. The 485·1 and

485-2 have no external trigger view. The

485-2

has Only

nvenical

input

impedance.

Input Coupling Selection

AC; DC; GND (provides zero reference, precharges

coupling capacitor, disconnects

nload

50 n

model.

Lower

-3

dB Point (AC coupling from

source)

ninput, 1kHz

less.

input

lX,

10 Hz

less.

Deflection Factor

5mV/div

5V/div

10 calibrated steps (1-2·5

sequence), accurate within

2%.

Uncalibraled, continuo

ously variable between steps

least 12.5 V/div.

Lights at edge of knob skirts indicate correct defleClion

faclor for 1

lOX

and

l00X

probes.

ELECTRICAL

CHARACTERISTICS

Gain can be recalibfated at fronl panel. 1

Mil

SAL

available at

botlom

panel to eliminate step

allenuator

shift above

mV/div,

the 1

mode.

VERTICAL

DEFLECTION SYSTEM

identical channels)

Display Modes

Channell;

Alternate; Chopped (approximatelv 1

MHz

rate); Added;

X·Y

(CH

-y

and

-XI;

Channel 2

(+Up

Inverted).

(VARIABLE gain

Terminated Source

c..---

TYPICAL

BANOWIOTH.

VS.

VARIABLE

GAIN

SETTING

300

BW.

MH.

200

Internal Trigger Source

Normal (displaved signal). Channel 1

Channel 2

signal.

500

400

BandwidthIand Risetime2

CALIBRATED3) From

son

_15°C

+35°C

From

nterminated source

-1SoC

+35°C.

within

paralleled by approximately 20 pF.

nDC

least

350

MHz, 1ns

Selectable Input Impedance

nwithin 0.5%.

VSWR

t;;;;1.25:

1on 5mV/div and

10 mV/div, 1.15:1 Irom 20 mV

5V!div

350

MHz.

to at least 250 MHz, 1.4 ns

Fill.

1·1.

Typical

Bandwidth,

vs.

Vari.bl.

G;oinSIII;ng tvaries

considerablv

depending

instrumant

SNI

,.,

Bandwidlh

tBWI mellsure<! 81

-3

down.

lRiSBlime c;otcul;oled

trom

O.35/BW.

From

+35°C

+55°C,

300

MH~

for

and

200

MH~

for

MO.

)Sea

Fi9.

1·1

for

effect

VARIABLE

gain

conlrol.

REV

C. MAR 1979

SO%

Per<;ent

CAL Gain

'00%

Speeification-485/R485

Service

200 V

100

60V

<DV

20V

10V

":::::

""'-

150

~~E~A~

!,~CING-..~

50V

"'-,- TYPICAL

PROTECTION_

~o,."'

....

DISCONNECT

Oi$l;onnlll;:1

CHARACTERISTIC

Threshold

::::

Ilatd!if'llJl

~o,

.......

...

NONRECURRING

SIGNALS

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

THIS

AREA

NOT

TRIP

THE

DISCONNECT

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

....

1 V 0.1 ms

50 nProtection

rnl

Tima

from

5urt

Applied

Voltage

Fig. 1-2. Typical

Protection

Disconnect

Charae:teristic.

Bandwidth

limiter

0.1 s1 •

Internal detection circuitry automatically disconnects

excessive signals

up to 50

The disconnected

condition

indicated, and has manual reset.

Maximum

Input

Voltage

50 nDisconnect occurs for voltages

that

exceed approx,

imately 5 V

RMS

continuous

0.1 watt-second for

instantaneous voltages of 5 V

Repeated application

voltages

excess

50 volts

and

greater than 0.1 watt-second

will

cause

deterioration

K1S1 relay contacts. due to arcing. Signals in

excess

150 volts will

damage

the instrument.

Mil·DC

coupled 250 V

(DC

+peak ACI. 500 V

pop

1kHz. AC coupled 500 V(DC +peak ACI. 500 V

pop

1kHz.

Common Mode Rejection

Added Mode

with

Channel 2invened.

least 10:1 at

50 MHz for a·division

signal

after adjusting

2gain

for

best

CMR at 50 kHz

and

mV/div.

1-2

Limits to approximatelv 20 MHz the Vertical

Amplifier

and Internal Trigger signals.

Channel Isolation

least 30:1 at 350 MHz.

Ext

Trigger Display (R485 and 485

only)

Momentary pushbutton

VERT

MODE

area

enables

display

EXT

ATrigger when Asource

EXT

position. Deflection factor

approximatelv 50 mV/div.

Risetime

approximately 1.5

ns.

Delav match

input

within

0.5

50%

amplitude.

Triggering level

within

0.5 div

center-screen.

Probe Power

Two

4-pin connectors at the

rear

the instrument

provide power suitable for optional active probes

such

the P6201.

®i

Specification-485/R485

Service

PROBE PERFORMANCE

(Probes are Optional Accessories)

Temperature Range

Lower Bandwidth for this

Input

-3

point with

485

Bandwidth

Type Atten. Impedance (maximum) (minimum) Specification

For Use WIth

nInput

010-6056·03

6ft.

P6056

lOX

500!"! 1

200

350

MHz

010-6056·05 -9ft.

010·6057·03

- 6 ft.

_15°C

to +35°C

P6057 100X 5k!"! 1

350

MHz

010·6057-{)5 -

9ft.

100

3pF 10

P6201 010·6201·01

-6ft.

Plug·

lOX

MS1

<1.5

330

MHz

DoC

to +35°C

(FET Probe)

100X 1

MS1

<1.5

For Use With 1

Mil

Input

010·6053·11 -

3112lt.

1M!"! 9.5

250

MHz

P6053A

010·6053·13

-6ft. lOX 1M!"! 12

250

MHz

-lS0Cto+35°C

010·6053·15

-9ft. 1M!"! 13.5 pF 200

MHz

Aand B

TRIGGERING

Time

Base

Aand BTrigger Sensitivity

Trigger Mode To 50

MHz

At 350

MHz

lot 0.3 div 1.5

div

Ext 20 mV 100

Signals below 16

are attenuated.

Reject Signals below 16 kHz are attenuated.

Reject Signals below 16

and above 50

kHz

are attenuated.

Sweep free·runs

the absence of atriggering signal

and lor signals below 20 Hz.

Sweep runs only when triggered.

Sweep runs one time on the first triggering event

alter

pressing the reset selector.

AUTOMATIC.

SINGLE SWEEP.

ATrigger Mode

NORMAL.

level

and Slope

BTrigger Mode

BRUNS AFTER DELAY TIME.

Starts automatically

the

end of the delay time.

Internal, permits selection of triggering point at any

level

on the positive and negative slope of the displayed

waveform. External,

level

adjustable through at least

to.5

Vfor either polarity

It5

Vfor

EXT

+10l.

BTRIGGERABLE AFTER DELAY TIME.

Runs when triggered. The B(delayed) sweep runs

once, in each of these modes, following the Asweep

delay time.

ASource

Internal, Line, External, External +10.

REV.

AUG.

1977 1-3

SpeCification--485IR48S Service

BSource

Bruns after Delay Time, Internal, External, External

+10.

Minimum Sweep Holdoff

Trigger Holdoff in

Norm

detent)

ATime Setting

External Inputs

1Mil paralleled by approximately 20 pF. Maximum

input voltage 500 V

(DC

+peak AC), 500 V

p.p

1kHz.

Jitter

less

than 0.1 ns at

350

MHz

and 1nsldiv.

1ns/div

0.1

~s/div

0.2

~s/div

0.5

~s/div

0.5

s/d;v

ATrigger Holdoff

less

than 0.4

~s.

Less

than 1.0

IJ.s.

Less

than 2times the

ATIMEIDIV setling.

HORIZONTAL

OEFLECTION

Time Base Aand B

1nsldiv to 0.5 sldiv

27 calibrated steps /1-2·5

sequence). Uncalibrated, A

continuously variable

between steps and to at least 1.25 sldi

....

Adjustable control permits astable presentation of

repetitive complex waveforms. The control covers at

least the time of one full sweep for sweeps faster than

0.2

s/di

....

BEnds A

The Asweep

reset at the end of the Bsweep to allow

the fastest possible sweep repetition rate for increased

trace intensity

the delayed sweep mode.

CALIBRATED

SWEEP

DELAY

Delay Time Range

9.9

times the Delay TimelDiv settings of 10 ns/div

0.5

s/di

....

Exclude

the

first (above 0.0) 1.0

turn

or the first

the

DELAY dial.

Differential Delay Time Accuracy (+1S'"C

+35"Cl

'Full

sca'e

i110X

Ihe

OeillY

Tima/Oiv

Sening.

Time

Base

Aand BSweep Accuracy (Center 8

screen divisions)

Sweep Rate +lS'"C

+3S'"C

-lS'"C

+SS'"C

1nsldiv to 20 nsldiv

'3%

'5%

50 nsldiv

0.1 sldiv '2% "'I'

0,2

sldi

...

0.5

sldi

...

'3% '5%

Display Modes

INTEi~sified

during Bdelayed, ALTernate display

of AINTEN and B(delayed sweep), Only Asweep

displayed for Asweep rates of

1,2

and 5ns/div.

1-4

DELAY TIME Setting

10 ns/div and 20 ns/div

ns/div to 1ms/div

2ms/div to

0.5

s/div

(1%

of mt:8surement

+0.2% of full

scale')

±(0.5% of measurement

+0.1

%of full scale)

(l%of

measurement

+0.1

%of

full

scale)

•

,.,

SPECIFIED

OIFFERENTIAL

OELAY

ACCURACY

V,.

SIZE

MEASUREMENT

div

ntldiv

2mild;"

0.5

sid;"

Specification-485/A485

Service

CRT

TEKTRONIX

CRT

4-inch rectangular

tube;

10 divisions

(0_8

cm/div)

display area.

P31

phosphor normally supplied;

Pl1

optional

without

extra charge.

kV accelerating

potential.

nsld;" to 1

mildi

~IO.5'"

me.",

••

mlnt

+0.'%

lull

lUll)

DIFFERENCE

Batween

Two

Dial

Raad;n!p,1Y.3je"

D,T~.

Oivision1

Fie.

'-3.

Specified

DiH

....

ntial Oelav

Accuracy

tIS. Size

Meawr.

manto

Jitter

less

than 0.005% (one part

20,000) of full scale plus

0.2

os. (Wrap-around cover must be

place.)

X-y

Full

Sensitivity

(CH

1Vert,

2Horizontal.) 5mV/div

5V/div

10 calibrated steps (1·2·5 sequence) accurate within

2%.

Gain can be recalibrated

front

pane1.

YPerformance

Identical

1. See Vertical Deflection.

X-Axis Bandwidth

4MHz (with 10 div reference signal).

x-v

Phase

Match

(Full

BWand

Limit)

Within 3° to 4MHz.

X·Gain Match

CH 2

+15°C

+35°C:

Photographic Writing Speed

At least 3div/ns for

standard

P31

phosphor;

least

6div/ns for optional

Pl1

phosphor (with the

TEKTRONIX C-31·R Camera and POLAROID 10,000

ASA film).

Auto

Focus

Automatically maintains beam focus for

all

intensitY

settings. (Intensified zone

and

EXT Zaxis are

not

auto-focused).

Graticule

Internal,

parallax. Variable edge-lighting. Markings

for measurement

risetime. Graticule

dark with

illumination off.

Beam Finder

limits

display wilhin graticule area.

External Z-Axis

Risetime 15 ns. Input R

500

+0.2 V

{DC

20 MHzl

blanks trace of average intensitY.

(DC

2MHz)

blanks maximum intensity trace.

Beam

Current

limit

Automatically limits the average beam

current

to protect

the CRT phosphor.

(limits

average

current

fJA

for

sweep rates faster than

ms/div; 5

fJA

for

ms/div

and slower sweep rates and for X·Y. Backup system

shuts down power supply

average

current

reaches

approximately

fJA.)

'-5

Specification~85/R485

Service

CALIBRATOR

Two-Frequency Fast-Rise Calibrator

ACCtJracies

+15D

+3SD

-lSOC

+SSD

SVamplitude

0.5%

load

0.5 Vamplitude to

1.5%

50 n

to.5%

load

50 mA amplitude to

optional

BNC

acces- ,% 1.5%

sorv

current loop

Selectable Frequency 0.25% 0.5%

of 1

MHz

and 1kHz

Output

Resistance

450 n

Risetime

Positive edge into

less than 1ns. O'JershOOl and

ringing less than

into 50 nat 1GHz bandwidth.

1kHz Duty Cycle

49.8%

50.2%

OTHER CHARACTERISTICS

Signal

Outputs

Posilive gates from both time bases lapprollimately 4V).

and apositive-going Sawtooth from Time Base A

(approximately 10 V). Gates and Sawtooth are approxi-

mately

0.5

Vamplilude into

Power Requirement

Two·position line voltage selector 115 V(90 V

136

and 230 V(180 Vto 272 V)

440

Hz.

watts mallimum at 115 Vand 60 Hz.

0.9

Amaximum at

115 Vand

Hz.

line

fuse: 3 A fast.

Cooling

Ouiet, filtered. forced-air ventilalion. Fan speed

increases smoothly with increasing ambient temperature.

ENVIRONMENTAL

CHARACTERISTICS

Ambient

Temperature

Operating:

_15

+S5D

Storage:

_3S

+75D

1·6

Altitude

Operating:

1015,000

feet. Maximum allowable ambient

lemperature decreased

Cper 1000 feet from

5,000

15,000 feet.

Nonoperating:

1050,000

feet.

VibrationS

Operating: 15 minutes along each of lhe three axis,

0.025 inch peak-to·peak displacement

g's at

Hzl

1010551010

in l-minute cycles.

ShockS

Operating and Nonoperaling: 30 g's, one half sine,

11·ms duralion, 2shocks per axis in each direclion for a

10tal

12shocks.

Electromagnetic Interference

(With

485

EMI

modificalion

option

41. Meets inter-

ference requirements of

Mll-1·618D:

power line

conducted, 150 kHz

25 MHz; radiated, 150 kHz

GHz.

Humidity

Operating and Storage: 5cycles (120 hours) to

95"

relalive humidity referenced

Mll-E-l6400F

(par.

4.5.91hrough 4.5.9.5.1, class 41.

Dimensions and Weight

Heighl; 6and

9/16

inches.

Width: (with handleI12 inches.

Depth (including panel

coved:

18 and 1/2 inches.

Depth (handle extended): 20 and

5/8

inches.

Net weight (wilhoul accessory case

and

panel

coved:

pounds.

Net weight (with panel cover, accessory case

and

accessories): 24 pounds.

Domestic shipping weight:

pounds.

Export·packed weight: 42 pounds.

SR48S

strapped

tab~,

nol

mounted

rloC:k.

Section

2~85/R485

Service

OPERATING

INFORMATION

PRELIMINARY

INFORMATION

The

485

cooled by air entering through the air filter

on the rear panel and exiting through the holes on the sides.

Adequate clearance must be provided at these locations.

Allow at least one inch clearance behind the air filter and at

least one inch on the sides.

Athermal

cutoot

this instrument provides thermal

protection and disconnects the power

the instrument

the internal temperature exceeds asafe operating level.

Power

automatically restored

.......

en the temperature

returns to asafe level.

Oean

the air filter periodically: a

dirtY filter prevents adequate air flow into

the

instrument.

Operating Temperature

The

485

can be operated where the ambient air

temperature

between

-ls'"C

and +5s'"C (+5°F

and

+131°F). This instrument can

stored in ambient

temperatures between

-5s'"C

and +75°C

(-67°F

and

+167"F). After storage at temperatures beyond the opera·

ting limits, allow the chassis temperature

come within

the operating limits before power

applied.

WARNING

This instrument

designed

for

operation from a

power source with irs nautra'

near earth

(ground) potential

with

aseparate safety-earth

conductor.

not

intended

for

operarion from two

phases

amulti-phase sysrem,

across the

legs

single-phase, three-wire system.

Operating Voltage

-----,

The

485

can be operated from either a115 Vor 230 V

nominal line voltage source,

a220 Vellternal battery

pack. The Line Voltage Selector switch on the rear panel

converts this instrument from one operating voltage

the

other.

General

To effectively use the 485, the operation and capabilities

of the instrument

must

be known. This section describes

the operation of the controls and connections and gives

first-time and general operating information.

CONTROLS ANO CONNECTORS

Power Cord Conductor Identification General

Conductor Color Alternate Color

Ungrounded (Line) Brown Black

Grounded (Neutral) Blue

lftfhite

Grounding (Earthlngl Green·Yellow Green·Yellow

This instrument

may

damaged

operated

with

the

Line Vo/rage $elector switch

set

incorrect posi-

tions

for

the line volrage applied.

The major controls and connectors for operation of lhe

485

are located on the front panel of the instrument. Some

aU;l{iliary

functions are provided on the side, top,

bonom

and rear panel. To make

full

use of the capabilities of this

instrument,

the

operator should be familiar with the

function and use of each of these controls and connectors.

Abrief description of each control and connector

given

here.

Front Panel

POWER

Pushbutton Turns instrument on or off.

115 V

230

V9(J.136 V

180-272 V

CAL 5 V Connector

BNC

connector for square·wave

voltage calibrator

output

signal.

The

485

designed to

used with athree-wire

power system.

the three

two·wire adapter

used

connect this instrument to atwo-wire

power system, be

sure

connect the groond lead of the adapter

earth

(ground). Failure

complete the groond

sV1tem

may allow

;he chassis of this instrument

be elevated above ground

potential and pose ashock hazard.

FREO Pushbutton

INTENSITY Control

BINTENSITY

Control

Selects one of

two

frequencies

kHz or 1

MHz)

for the last-fise

calibrator signal.

Controls intensitY of writing beam.

Provides additional intensitY coo-

trol for the BSWEEP.

AEV.C,MAA.1977

2·'

Andere Handbücher für 485

Dieses Handbuch passt für folgende Modelle

Inhaltsverzeichnis

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