Tektronix 285 Manuale utente

INSTRUCTION

MAN

UAL

Serial

Number

Tektronix,

Inc.

(©)

1968

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

the

United

States

America.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

permission

the

owner.

S.W.

Millikan

Way

©.

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables:

Tektronix

070-0903-00

1168

Type

285

Power

Supply

for

S-50

Series

Heads.

Fig.

1-1.

Type

285

Type

285

SECTION

TYPE

285

SPECIFICATION

General

Information

The

Type

285

Power

Supply

for

S-50

Series

Heads

contains

the

regulated

power

supplies

for

operation

either

the

Type

$-50

Pulse

Generator

Head

the

Type

S-51

Trigger

Countdown

Head.

provides

front

panel

trigger

output

jack

for

the

internal

trigger

pulse

any

S-50

series

head.

Characteristics

The

following

characteristics

apply

over

am-

bient

temperature

range

0°

+50°

and

after

five-minute

warmup,

provided

the

instrument

has

been

calibrated

temperature

between

+20°

and

+30°

ELECTRICAL

CHARACTERISTICS

Characteristic

Performance

Requirement

Output

Voltage

within

+15

within

and

-12.2

Maximum

Output

Current

100

from

each

supply

Ripple

mV or

Tess

Grounded

Neutral

Distri-

bution

System

115

VAC

136

VAC

230

180

VAC

272

VAC

Line

Voltage

Range

Line

Frequency

50 Hz

400

Fuse Data

115

1/8

Slo

Blow

230

1/16

Slo

Blow

ENVIRONMENTAL

CHARACTERISTICS

Storage

Operating

Temperature--

-40°

Temperature--

stated

+65°C

above

the

Electrical

Characteristics

table.

Altitude--

50,000

Altitude--

15,000

feet

MECHANICAL

CHARACTERISTICS

Dimensions--

Height

1/8

inches

Width

inches

Length

inches

Approximate

dimensions

include

switch

and

cord

holders.

Construction--

Aluminum

allow

chassis

with

epoxy

laminated

circuit

boards.

Both

circuit

boards

are

removable

with-

out

using

soldering

iron.

The

front

panel

anodized

aluminum.

The

textured

aluminum

cover

has

blue

vinyl

paint.

Accessories---

Standard

accessories

supplied

with

the

Type

285

are

listed

the

Me-

chanical

Parts

List.

1-1

Type

285

SECTION

OPERATING

INSTRUCTIONS

General

Information

The

Type

285

Power

Supply

for

S-50

Series

Heads

intended

for use

with

special

heads

such

the

Type S-50

Pulse

Generator

Head

the

Type

S-51

Trig-

ger

Countdown

Head.

The

Type

285

provides

the

regula-

ted

supply

voltage

requirements

one

Type

S-50

series

head.

Regulated

voltages

are

delivered

the

S-50

series

head

through

connector

J40

the

rear

the

plug-in

compartment.

coaxial

connector,

J17,

also

located

the

rear

the

plug-in

compartment.

coaxial

cable

within

the

Type

285

connects

J17

the

TRIGGER

OUT

con-

nector

(J45),

the

Type

285

front

panel.

The

signal

available

the

TRIGGER

OUT

connector

depends

the

type

S-50

series

head

plugged

into

the

Type

285.

See

the

instruction

manual

for

your

S-50

series

head

for

further

information.

Operating

Information

line

voltage

Selector

switch

the

Type

285

rear panel

permits

operation

from

115

VAC

230

VAC.

sure

the

switch

set

the

position

corresponding

the

line

voltage

utilized,

and

connect

the

Type

285

power

cord

the

line.

The

S-50

series

head

plugged

into

the

compart-

ment

provided

the

Type

285

front

panel.

insert

S-50

series

head,

slide

the

unit

completely

into

the

compartment

the

Type

285,

leaving

the

latch

the

bottom

the

unit free

move.

Push

the

latch

knob

lock

the

S-50

series

head

place.

remove

the

head,

pull

the

latch

knob

away from

the

panel.

See

Fig. 2-1.

toggle switch

the

front

panel

the

Type

285

turns

the

instrument

off.

POWER

indica-

tor

lights

when

the

POWER

switch

and

the

instru-

cee

TEKTRONIX,

INC.,

PO!

ment

connected

the

line

voltage.

Coan

TYPE

285

POWER

SUPPL

—

Fig,

2-1.

$-50

series

head

installed

the

Type

285.

2-1

Type

285

SECTION

CIRCUIT

DESCRIPTION

The

Type

285

Power

Supply

develops

regulated

vol-

tages

-12.2

and

+15

for

the

Type S-50

series

head.

The

Type

285

Power

Supply

operates

from

115

VAC

230 VAC

power

source.

Switch

SW2

must

placed

the 115

position

the

power

source

115

VAC.

The

primary

windings

transformer

are

connected

parallel

and

fuse

protects

the

Type

285

Power

Supply

case

overload.

the

power

source

230

VAC,

place

switch

SW2

the 230

position.

The

pri-

mary

windings

transformer

are

connected

series.

Fuse

connected

series

with

Fl,

and

the

controlling

fuse.

POWER

indicator

light

connected

across

the

secondary

winding

the

-12.2

Power

Sup-

ply.

POWER

switch

SW1

connects

both

sides

the

pow-

line

the

Type

285

Power

Supply.

The

+15

Power

Supply

composed

transformer

secondary

winding

(terminals

and

the

transfor-

mer),

full

wave

bridge

rectifier

D020,

filter

capacitor

C20,

error

signal

amplifier

Q24,

inverter

amplifier

Q33 and

series

regulator

Q35.

The

regulator

action

follows:

(Assuming

positive-going

change

output

voltage.)

Q24A

biased

Zener

diode

022.

Q24B base

biased

the

voltage

divider

network

R29,

R30

and

R31.

R30

sets

the

Power

Supply

output

+15

The

error

sig-

nal

applied

Q24B

base

through

the

voltage

divider

R29,

R30,

and

R31.

(C29

couples

fast-rise

signals

Q24B base

for

greater

output

from

Q24B.)

Emitter

fol-

lower

Q24B

drives

Q24A

emitter.

The

in-phase

error

output

signal

the

junction

R26 and

R27

drives

Q33

base.

Q33

inverts

and

amplifies

the

signal

drive

035,

which

serves

variable resistor

series

with

the

load.

The

signal

Q35

reverse

biases

the

transistor

decrease

the

current

through

and

the

load.

The

decreased

current

through

the

load

lowers

the

load

voltage

the

desired

value.

Turning

the

Type

285

with

the

load

connected,

first

most

the

supply

voltage

appears

across

Q35

which

cut

off

(it

nas

very

high

resistance);

There-

fore,

the

output

voltage

about

zero

volts.

Q16

the

-12.2

Power

Supply

also

turned

off

since

that

supply

does

not

have

the

+15

necessary

for

proper

operation.

Network

R36, R37,

R38

and

D37

applies

for-

ward

bias

and

turns

Q35.

With

about

zero

volts

feeding

R37,

(instead

the

normal

operating

voltage

-12.2

V),

approximately

-27

volts

the

junction

R37-R38,

D37

biased

into

conduction.

The

resul-

ting

voltage

drop

across

R36

forward

biases

Q35

into

conduction

and

the

+15

volt

Power

Supply

output

rises

+15

which

time

the

-12.2

Power

Supply

oper-

ates

properly

and

D37

reversed

biased

(cut

off).

Components

not

described

above

provide

the

fol-

lowing

functions:

C22

helps

stabilize

Q24A

base

voltage

for

high

frequency

signals

and

reduce

the

noise

generated

022.

R26

parasitic

suppressor.

D33

provides

temperature

compensation

for

Q33.

C39

re~

duces

the

high

frequency

output

impedance

the

sup-

ply.

The

-12.2

Power

Supply

composed

trans-

former

secondary

winding

(terminals

and

the

transformer),

full

wave

bridge

rectifier

D4,

filter

capacitor

C4,

error

signal

amplifier

Q6,

emitter

fol-

lower

Q12 and

series

regulator

Q16.

The

regulator

action

follows:

(Assume

negative

change

output

voltage).

Q6B

base

biased

the

voltage

divider

R10

and

R11.

R10

con-

nected

the

+15

reference

voltage.

The

error

sig-

nal

applied

Q6B

voltage

divider

R10

and

R11.

(C11

couples

fast

rise

signals

Q6B

base

for

greater

output

from

Q6B.)

Emitter

follower

Q6B

drives

Q6A

emitter.

The

in-phase

error

output

signal

the

col-

lector

Q6A

drives

emitter

follower

Q12.

In-phase

output

from

Q12

emitter

drives

Q16,

which

serves

variable resistor

series

with

the

load.

The

neg-

ative-going

signal

Q16

base

reverse

biases

the

tran-

sistor

decrease

the

current

through

and

the

load.

The

decreased

current

through

the

load

raises

the

voltage

back

-12.2

Rl2

transistor

Q12's

dissipation

limiting

re-

sistor.

C18

reduces

the

high

frequency

output

impe-

dance

the

supply.

3-1

Type

285

SECTION

MAINTENANCE

Removal

the

Case

Remove

the

screws

holding

the

power

cord

holders

and

the

case

will

slide

off

the

rear

the

Type

285.

Parts

Removal

and

Replacement

Whenever

part

replaced,

check

and

adjust

the

power

supplies

necessary;

see the

Calibration

sec-

tion.

Most parts

the

Type

285

can

replaced

with-

out

detailed

instructions.

Parts

ordering

information

included

immediately

preceding

the

Electrical

Parts

List

section.

CAUTION

Disconnect

the

power

cord

before

re-

moving

fuses

other

components.

Transistor

Replacement.

Transistors

should

not

replaced

unless

they

are

actually

defective.

Tran-

sistor

defects usually

take

the

form

the

transistor

opening,

shorting

developing

excessive

leakage.

check

transistor

for

these

and

other

defects,

use

transistor

curve

display

instrument

such

Tektronix

Type

575.

However,

good

transistor

checker

not

readily

available,

defective

transistor

may

found

making

in-circuit

voltage

checks,

substitution.

The

location

all

transistors

silk-screened

the

circuit

board

the

socket

or on

the

chassis

for

the

rear-panel

mounted

power

transistors.

check

transistors

using

voltmeter,

measure

the

emitter-to-base

and

emitter-to-collector

voltages

and

determine

whether

the

voltages

are

consistent

with

the

normal

resistances

and

currents

the

circuit

(see

Fig.

4-1).

Note

the

lead

configuration

Fig.

4-2.

there

doubt

about

whether

the

transistor

good

not,

substitute

new

transistor,

but

first

certain

the

circuit

voltages

applied

the

transistor

are

correct

before

making

the

substitution.

tran-

sistor

substituted

without

first

checking

out

the

circuit,

the

new

transistor

may

immediately

damaged

some

defect

the

circuit.

4-1

Parts

Replacement.

The

replacement

parts

sol-

dered

the

circuit

boards

follows:

Clip

the

leads

the

component

to be

re-

placed.

Remove

the

component

from

the

circuit

board.

Remove

the

clipped

leads

individually

from

the

circuit

board.

The

tip

the

soldering

iron

should

copper

with

chisel

bevel

shape.

obtain

Tow

working-

tip

temperature,

consider

the

following:

slow

soldering

speeds,

25-watt

iron

and

1/8

inch

tip.

medium

soldering

speeds,

4-watt

iron

and

3/16

inch

tip.

fast

soldering

speeds,

50-

60-watt

iron

and

1/4

inch

tip.

Install

the

new

part, with

leads

bent

fit

the

holes

and

clipped

they

will

just

protrude

through

the

board,

and

apply

heat

and

solder

for

firm

sol-

der

joint.

The

best

type

solder

for

use

the

Tektronix

circuit

boards

"eutectic"-type

cored-wire

solder

size

#20

AWG,

composed

63%

tin

and 37%

lead

with

central

core

activated

rosin

flux.

Fig.

4-1.

In-circuit

voltage

checks

NPN

PNP

transistors.

Fig.

4-2.

Lead

configuration

transistors

the

Type

285.

Circuit

Board

Replacement.

circuit

board

damaged

and

cannot

repaired,

the

entire

board,

inclu-

ding

all

soldered-on

components,

should

replaced.

The

part

number

given

the

Mechanical

Parts

List

for

the

completely

wired

board.

Both

circuit

boards,

which

are

mounted

back

with

plastic

spacer

separation,

are

secured

chassis

mounting

screws.

Loosen

the

mounting

screws

and

lift both

circuit

boards

from

the

chassis.

Sepa-

Maintenance-Type

285

rate

the

boards

gently

pulling

the

+15

Regulator

board

upward

from

the

-12.2

Regulator

board.

Color-

coded

wires

are

removed

from

the

pins

pulling

straight

off

with

long-nosed

pliers.

The

sequence

wires

the

-12.2

Regulator

board

listed

Table

4-1.

Table

4-1

Red

White

Green

White

Pinc

Blue

White

Grey

White

(2)

Violet

White

(2)

White

Yellow

White

Orange

White

Black

White

Brown,

Red,

Black

White

Green, Green,

Black

White

attach

the

+15

Regulator

board

the

-12.2

Regulator

board,

align

the

pins

and the

mounting

screws

before

easing

the

board

into

position.

Install

the

circuit

boards

and

tighten

the

mounting

screws.

Parts

Locations

All

components

mounted

circuit

boards

are

iden-

tified

circuit

numbers

and

shown

the

photographs

included

the

remainder

this

section.

Case

Replacement

Align

the

case

the

side

adjustment

hole

will

be on

the

left

the

285,

the

head

opening,

and

the

feet

the

bottom.

Slide

the

case

the

Type

285

and

attach

the

cord

holders

with

the

mounting

screws.

4-2

Maintenance-Type

285

—

Fig.

4-3.

+15

Regulator

circuit

board.

——————

Fig,

4-4.

12.2

Regulator

circuit

board.

Type

285

SECTION

PERFORMANCE

CHECK/CALIBRATION

Introduction

This

section

the

manual

contains

procedure

for

checking

and

calibrating

the

power

supplies

the

Type

285.

The

instrument

will

not

require

frequent

calibration,

but

occasional

adjustments

will

nec-

essary

components

age

are

replaced.

Equipment

Required

The

following

equipment

its

equivalent

re-

quired

for

calibration

the

Type

285.

Autotransformer

with

output

voltage

variable

between

and

136

VAC

(or

180

272

VAC)

and

minimum

rating

watts.

the

autotransformer

does

not

have

voltmeter

indicate

output

voltege,

mon-

itor

its

output

with

RMS

reading

voltmeter

with

range

least

150

(300)

volts.

For

example,

Gen-

eral

Radio

WIOMT3W

Metered

Variac

Autotransformer.

Oscilloscope,

maximum

deflection

factor

mV¥/div

and

comparison

voltage

for

measurement

+15

and

-12.2

within

0.2%.

Tektronix

Type

Plug-In

Unit

with

Type

545B

Oscilloscope

(540

series)

Tektronix

Type

3A7

Differential

Comparator

with

Type

3B4

Time

Base

Unit

and

Type

561A

Oscilloscope

(560-Series)

meet

these

requirements.

probe,

Tektronix

P6028.

Tektronix

Part

No.

010-0074-00.

Type

plug-In

Unit

not

available,

precision

voltmeter

needed

that

can

measure

+15

-12.2

with

accuracy

+0.2%.

John

Fluke

Model

801B

meets

the

requirements.

Test

loads

for

power

supplies:

+15

supply;

150

watt,

composition

resis-

tor,

10%

tolerance,

Tektronix

Part

No.

306-0151-00.

-12.2

supply;

120

watt,

composition

resis-

tor,

10%

tolerance,

Tektronix

Part

No.

306-0121-00.

Four

clips,

Mueller

#30

miniature,

to be

at-

tached

the

test

load

resistors.

Tektronix

Part

No.

344-0024-00.

PRELIMINARY

INSTRUCTIONS

Disconnect

the

power

cord.

Remove

the

case

the

Type

285

removing

the

power

cord

holder

screws

and

sliding

the

case

off

the

rear.

Connect

the

120

resistor

between

J40

and

ground.

Connect

the

150

resistor

between

opposite

and

ground.

Connect

the

Type

285

power

cord

the

output

the

variable

autotransformer.

Turn

the

instrument

power

and

adjust

the

autotransformer

for

output

115

volts

deter-

mined

the

LINE

VOLTAGE

SELECTOR,

located

the

rear

panel.

Turn

the

oscilloscope.

Allow

minutes

for

warmup

and

stabilization.

Set

the

oscilloscope

and

Type

controls

follows:

5-1

Performance

Check/Calibration-Type

285

Fig.

5-1.

Locations

test

points

and

adjustment.

R30

+15

Volts

Oscilloscope

Triggering

Int,

Stability

Fully

clockwise

Time/cm

Type

Range

Comparison

Véltage

1500

GND

Input

Atten

Display

A-Vc

Millivolts/cm

Variable

Calib

PROCEDURE

Check

Adjust

Power

Supplies

Set

the

oscilloscope

trace

the

graticule

center

line.

Connect

the

probe

the

150

resistor

the

Type

285.

Fig.

5-1

shows

the

locations

test

points

and

the

adjustment.

5-2

Set

the

GND

switch

and

the

Range

switch

+11.

Check

that

the

trace

the

center

line

with

comparison

Voltage

setting between

1515

and

1485

(15

volts

41%).

the

Comparison

Voltage

not

between

1515

and

1485,

adjust

R30,

the

+15

volts

control,

until

the

trace

the

graticule

center

line

with

Comparison

Voltage

set

1500.

Change

the

autotransformer

output

voltage

from

volts

136

volts

and

check

that

the

+15

supply

remains

within

the

tolerance.

Set

the

autotransformer

output

voltage

115

volts.

Set

the

Range

switch

and the

GND

switch

GND.

Connect

the

probe

the

120

resistor.

Set

the

trace

the

center

line.

Set

the

Comparison

voltage

1220.

Change

the

GND

switch

and the

Range

switch

-11.

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