Feedback 550603 User manual

~

Sine-Square

,

Oscillator

550603

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OSCILLATOR

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FEEDBACK

www.g0rsq.co.uk

Sine-Square

Oscillator

550603

Contents

Section

1

Description

Section

2 Operation

Section

3

Circuit

Description

Section

4 Maintenance

E

FEEDBACK

INSTRUMENTS

LIMITED

CROWBOROUGH

SUSSEX

ENGLAND

Telephone:

Crowborough

(08926)

3322

Cables: Feedback

Crowbr

Telex:

95255

Manual

603

EdC

0480

Printed

in

England

by

FI

Ltd,

Crowborough

I

Feedback

Instruments

Lld

Component replacement

Although

this

Feedback

manual

was

believed

to

be

correct

at

the

time

of

printing,

components

supplied

may

differ

slightly

from

those

described.

We

endeavour

continually

to

improve

our

equipment

by

incorporating

the

latest

developments

and

components,

even

up

to

the

time

of

despatch.

Whenever

possible

we

will

include

such

new

or

revised

information.

Whenever

possible,

replacement

components

should

be

similar

to

those

originally

supplied.

These

may

be

ordered

direct

from

Feedback

Instruments

Limited

or

its

agents

by

quoting

the

following

information;

1.

Equipment

type

2.

Equipment

serial

number

3.

Co'mponent

reference

4.

Component

value

Standard

components

can

often

be

replaced

by

alterna·

tives

available

locally.

COPYRIGHT

NOTICE

©

Feedback

Instruments

Limited.

All

rights

reserved.

No

part

of

this

publication

may

be

reproduced,

stored

in a

retrieval

system,

or

transmitted,

in

any

form

or

by

any

means,

electronic,

mechanical,

photocopying,

recording

or

otherwise,

without

the

prior

perm:ssion

of

Feedback

Instruments

Limited

2

The Health

and

Safety at Work Act

1974

We

are

required

under

the

Health

and

Safety

at

Work

Act

1974,

to

make

available

to

users

of

this

equipment

certain

information

regarding

its safe use.

The

equipment,

when

used

in

normal

or

prescribed

applications

withtn

the

parameters

set

for

its

mechanical

and

electrical

performance,

should

not

cause

any

danger

or

hazard

to

health

and

safety

if

normal

engineering

practices

are

observed

and

they

are

used

in

accordance

wi

th

the

ins

tructi

ons

suppl ied.

If, in

specific

cases,

circumstances

exist

in

which

a

potential

hazard

may

be

brought

about

by

careless

or

improper

use,

these

will be

pointed

out

and

the

necessary

precautions

emphasized.

While

we

attempt

to

give

the

fullest

possible

user

information

in

our

handbooks,

if

there

is

any

doubt

whatsoever

about

any

aspect

relating

to

the

proper

use

of

this

equipment

the

user

should

contact

the

Product

Safety

Officer

at

Feedback

Instruments

Limited,

Crowborough.

DESCRIPTION

1.1 Introduction

The

Feedback

SS0603

Sine-Square

Oscillator

is

based

on

a novel RC

oscillator

circuit

that

generates

sine waves.

A

block

diagram

of

the

main

features

of

the

circuit

is

shown

in fig

1.1.

The

fine

frequency

controlling

element

is

a

dual-gang

air-spaced

capacitor

effectively

giving

infinite

resolution,

and

the

ranges

are

selected

by

switching

the

requisite

resistors.

Sine-Square

Oscillator

SS0603

SECTION 1

A

thermistor

is

used

to

control

the

amplitude

of

oscillation.

A

current

input

Schmitt

trigger

is

used

to

produce

a

square

waveform

from

the

sine

wave

for

the

various

square-wave

output

options.

The

output

amplifier

provides

a

current

which

is

connected

to

the-slider

of

the

600-ohm

output

resistance,

thus

providing

an

output

from

a

true

GOO-ohm

output

impedance.

I

C

I R I

AI\.~I\./'-....a

output

•

...

voltage

lA

R Schmit t

current

600n

follower amplifier

trigger

S

chmitt

mode

sine/square

Fig

1.1

~

3

Feedback

Instruments

Ud

When

the

TTL

output

is

selected

the

output

1.2

Mechanical

current

is

shunted

by

a zen

er

diode

to

keep

the

output

The

550603

is

housed

in

an

ASS

plastic

case

made

in

voltage

and

output

impedance

at

values

suitable

for

two

halves

each

secured

by

two

screws

on

each

side.

TTL.

The

case

provides

the

main

structural

strength

of

the

A

separate

sinewave

'sync'

output

is

continuously

instrument.

Removal

of

the

case

gives access

to

all

available

for

oscilloscope

synchronisation

or

frequency

components.

Without

the

cover

the

SS0603

consists

of

monitoring

. a

horizontal

PWB

fixed

by

small

plastic

brackets

to

the

•

FEEDBACK

SINE

FAEQUEN~

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100-1

Ok

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OUTPUT

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IOQk-l

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.'"

Hz

6

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-

POWER

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=--

...

0:=

/

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~

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Ill'

I

IIII

Fig 1.2

4

front

and rear panels.

This

provides a

structure

strong

enough

for

normal

handling

and maintenance.

The

low

power

dissipation

of

the

SS0603

obviates

the need

for

ventilation

holes. The

oscillator

tuning

capacitor

and associated resistors are

mounted

in a die-

cast metal screening

box

fixed

to

the

front

panel. This

provides

complete

electrostatic

screening and

protection

from

dust

for

the sensitive high-impedance

circuit.

All

controls

are situated on the

front

panel shown

in fig 1.2.

They

are:

Power Red push

button

power

switch

Separate red

power

indicator

Frequency

Rotary

range

switch

0..

r-.

Fine

frequency

control

(approx·

Q

imately

logarithmic

cal

ibrated

"

frequency

dial)

Waveform

Selection

Four

black push

buttons

Amplitude

Single

rotary

control

Output

terminals Main

output

from

pair

of

Red

and Black

4mm

socket

binding

posts

TTL

Output

Separate

4mm

socket

Sync

out

4mm

socket

Sine-Square Oscillator

SS0603

1.3 Specification

of

type

SS0603

The

SS0603

is

a general-purpose, solid state

'RC'

sine

oscillator

providing

sine wave

or

square wave

outputs.

Frequency

Range

10Hz

to

1MHz

in five switched ranges.

Resolution

-

infinite.

Range Overlap

25% at

top

of

each range and 10% at

bottom

of

each

range.

Scale

Accuracy

±5%

of

setting.

Typically

±2%

of

setting.

Frequency

Stability

Measured at 1

kHz

on 1

to

10kHz

range.

Drift

Typically

50ppm

per

10

minutes

measured

after

10

minutes

warm

up.

Supply

voltage change

Typically

0.003%

for

10% change

in

supply

voltage.

Main

Output

Waveforms

Sine, Square

or

Positive-only

Square wave selected

by

pushbuttons.

Output

Impedance

nominally

600

ohms.

5

Feedback

Instruments

L

td

Amplitude

Control

Single

continuous

control

nominally

0-15V

pk-

pk

at

1V

pk-pk

intervals.

Minimum

Usable

Output

Typically

200mV

pk-pk.

Amplitude

Stability

Typically

±1% over frequency range.

Offset

The

d.c

component

on the sine and square waveforms

is

separately set

by

internal adjustments and

is

normally

set

to

within

0.1V

of

zero. This d.c

component'

is

reduced

proportionally

to

the signal

output

by

the

output

control

(or

by

resistive loading).

Terminations

4mm

binding

posts (Hi-red and Lo-black) on J;';"

pitch

Purity

Sine

distortion

less

than

05%

at 1kHz.

Square wave rise and fall times -

less

than 100ns.

Auxiliary Outputs

TTL compatible square wave Available

only

when

appropriate

pushbutton

is

depressed.

Amplitude

+3.5

to

+4.5V

in the 'high' state and

o

to

·lV

in the

'Iow'

state.

Rise Time

Less

than 100ns.

6

Current sink capacity Eight standard

TT

L loads.

Termination

4mm

socket

Sync

Out

Continuously

available sine

waveform

Amplitude

2

to

6V

pk-pk

DC

component

Less

than

4V

d.c

Impedance 1k

r2

Termination

4mm

socket

Power requirements

Line

voltage

200!250V

or

1

00!125V

rms,

50

or

60Hz.

Consumption

5VA

Fuse

315mA

slow

blow

(20mm

x

5mm)

Littel

fuse

style

213

Seswick

TDC

123

Suss

GMA

Dimensions and Weight

Width

300mm

(1

2in)

Height

(with

feet)

115mm

(45in)

Depth

225mm

(gin)

Weight

2.1

kg

(4.63Ib)

OPERATION

2.1 I

nstallation

of

SS0603

The

oscillator

·is

packed

in inserts

of

expanded

poly-

styrene

to

prevent

damage

in

transit.

On

opening

the

end

of

the

corrugated

cardboard

container,

the

inserts

together

with

the

SS0603

should

be

smoothly

withdrawn

from

the

container.

Take

care

that

the

inserts

and

the

SS0603

are

held

together

during

this

time.

I

nspect

the

SS0603

and

if

any

damage

is

evident

immediately

notify

the

carrier.

2.2

Voltage

Selection

Ensure

that

the

instrument

is

set

to

the

appropriate

voltage

supply.

This

is

effected

either

by

inspecting

the

tag (if

fitted)

on

the

power

cable

or

by

checking

the

voltage

selection

switch

after

removing

the

top

cover

of

the

instrument.

Voltage

selection

is

accomplished

by

a slide

switch

on

the

printed

circuit

board;

it

has

positions

marked

'115'

and

'230'.

Set

the

switch

to

'115'

for

operation

from

100

to

125

volts

and

to

'230'

for

200

to

250

volts.

Wire

connections.

The

colour

code

of

the

power

supply

cable

is:

Brown

Live

Blue

Neutral

Green/Yellow

Ground

Sine-Square

Oscillator

SS0603

SECTION 2

The

ground

wire

is

connected

to

the

front

and

rear

panels

of

the

SS0603

and

to

the

common

terminal

on

the

front

panel.

2.3

Frequency

Selection

Any

value

of

frequency

in

the

range

10Hz

to

1MHz

may

by

obtained

by

use

of

the

range

switch

and

fine

frequency

control.

The

rotary

range

switch

provides

the

following

frequency

decades:

10Hz

to

100Hz

to

1.0kHz

to

10kHz

to

100kHz

to

1MHz

The

required

frequency

is

set

by

the

variable

control,

graduated

1

to

10

(0.9

to

13

with

overlap).

For

example,

to

set

3.6kHz

turn

the

range

switch

to

the

1.0kHz

to

1OkH z range

and

turn

the

variable

control

to

3.6.

2.4

Outputs

Selection

A

required

output

waveform

is

selected

by

pushing

one

of

the

four

output

selection

buttons

-

Sine,

Square,

positive

only

square

wave

or

TTL-compatible

square

wave.

Of

these

four

options,

only

the

TTL

output

is

available

from

a

separate

4mm

socket,

the

remainder

being

available

from

the

Main

Output.

7

Feedback

Instruments

Ltd

Main

Output

The

amplitude

of

the

output

waveform

is

set

by

the

output

control

knob

cal i

brated

from

0

to

15V

pk-pk

and

is

the

open-circuit

or

no-load

voltage.

The

output

impedance

is

600

ohms

and

any

loading

will

lower

the

output

voltage.

In

particular

if

loaded

with

600

ohms

the

terminal

voltage

will

be

half

that

indicated.

TTL

Output

This

output

is

available

from

a

separated

4mm

socket

when

the

appropriate

pushbutton

is

depressed.

The

separate

output

is

provided

as a

precaution

against

accidental

damage

that

might

ensue

should

an

overvoltage

be

applied

and

the

wrong

waveform

pushbutton

depressed.

The

output

ampl

itude

is

fixed

and

is

5-volt

TTL-compatible.

The

output

impedance

is

low

when

in

the

'0'

or

'1'

condition

and

is

high

during

transition.

SVnc

Output

This

extra

sinewave

is

continuously

available

and

is

Intended

for

such

functions

as

frequency

monitoring

and/or

oscilloscope

synchronisation.

In

the

latter

case

the

use

of

a

sinewave

allows

a

certain

amount

of

phase

adjustment

of

the

oscilloscope

display

by

adjustment

of

the

oscilloscope

trigger

level.

Phase relationships

The

sync

output

is

in

phase

with

the

main

sine wave

output

and

in

approximate

anti-phase

to

the

various

square

wave

outputs.

8

CIRCUIT DESCRIPTION

For

convenience

the

circuits

in

this

section

are

simplified

or

in

the

form

of

block

diagrams.

The

full

circuit

is

shown

in

fig

4.4.

3.1 RC Frequency Network

The

basic

oscillator

is

based

on

the

circuit

shown

in

fig

3.1.

V1

r;r

Fig

3.1

This

circuit

was

used

in

preference

to

other

RC

circuits

because

it

enables

the

frame

of

the

double-gang

variable

capacitor

C,

C'

to

be

grounded.

At

resonance

the

oscillatory

voltages

will be as in

the

phasor

diagram

fig

3.2.

The

amplifier

A

amplifies

VR'

by

X3,

to

provide

5ine-5Quare

Oscillator

550603

SECTION 3

the

voltage

V I

to

maintain

oscillation.

The

phase

and

gain

relationship

of

the

network

RCR'C'

is

very

similar

to

that

of

the

active

side

of

the

well-known

Wien Bridge.

1

The

resonant

frequency

is

f

'"

---

where

R

'"

R'

27TRC

and

C

'"

C'.

vc'~7

VR/

Fig

3.2

Phasor diagram

The

amplitude

of

oscillation

is

maintained

by

controlling

the

gain

of

the

oscillator

loop

by

means

of

a

thermistor.

3.2

RC

Oscillator Amplifier

Fig

3.3

shows

the

amplifier

used

to

maintain

oscillation

in

the

RC

network.

The

FET's

TR9a

and

TR9b

provide

suitable

high

impedance

inputs

for

connection

from

the

RC

network.

The

differential

input

stage

TR9-11

has

two

outputs.

One

output

is

used

for

feedback

to

the

RC

network

via

the

thermistor

and

the

emitter

follower

TR

14

while

the

other

output

goes

to

the

output'

circuit

which

includes

the

Schmitt

trigger.

The

gain

of

the

9

Feedback

Instruments

Ltd

amplifier

is

principally

determined

by

the

ratio

of

dissipated

in

the

thermistor

causes

its

resistance

to

drop

resistor

network

RA

and

resistor

R2 .

For

steady

so

reducing

the

rate

of

build

up

of

oscillation.

A

point

oscillation

this

ratio

has

to

be

about

1

:3.

When

the

of

equilibrium

is

reached

where

the

thermistor

resistance

thermistor

R2

is

cold

the

ratio

is

much

greater

than

3

and

is

just

three

times

that

of

resistor

network

RA.

so

the

amplitude

of

oscillation

builds

up.

The

power

then

stabilising

the

ampl

itude

of

oscillation.

r-----

I

sinewave

current

to

output

circuit

differential

in

put

stage

I

TR10

TR11

:

TR9a

TR9b

hi h I

impe~a

n~c~eptl--1~WL.---J

push-pull

I

input

froml

R

.C.

O--+------+--------J

Cire u it I

I

~

RA--~~~

I

L _

Fig

3.3

10

3.3

Schmitt Trigger

Unless

'the

sine

wave

main

'output'

is

selected,

the

Schmitt

Trigger

produces

a

square

waveform

from

the

sinewave

input.

The

circuit

is

shown

in

fig

3.4(a)

and

the

corresponding

waveforms

in

3.4(b).

V

cc

TR18

point B • square

wO

ve

•

out

TR13

point A

sine

current

input

(point

A)

Sine-Square

Oscillator

550603

When

the

sinewave

is

selected

resistor

R42

is

shunted

by

resistor

R34

so

that

switching

does

not

take

place

and

a

sine

voltage

waveform

is

available

at

the

emitter

of

transistor

TR

13.

corresponding

waveforms

Vcc

val tage 8

A

time

1I

\.

Vrefi\1

\

sme

current

input

time

(0 ) (

b)

Fig 3.4a Fig

3.4b

11

Feedback

Instruments

Ltd

3.4

Output

Circuit

The

sine

or

square-wave

voltage

waveforms

generated

by

the

circuit

in fig

3.4(a)

are

converted

to

a

corresponding

current

waveform

by

transistor

TR16.

Transistor

TR19

provides

a

constant-current

load

switched

to

the

appro-

priate

value

for

the

selected

waveform.

When

TTL

is

selected

the

output

current

is

fed

to

a

Zener

diode

to

limit

the

voltage

excursion

abruptly

at

positive

and

negative limits

suitable

for

5-volt

TTL.

For

all

other

output

options

the

output

current

is

connected

to

the

slider

of

the

linear

output

potentiometer

which

is

shunted

to

provide

a

600-ohm

output

impedance.

3.5 Power Supply

The

SS0603

circuit

operates

from

unregulated

positive

a,nd negative

voltage

lines

of

about

25

volts.

The

mains

transformer

has a

double

primary

winding

connected

in series for

200

to

250-volt

operation

and

in

parallel for

100

to

125-volt

suppl

ies.

Voltage

selection

is

effected

conveniently

by

a slide

switch

positioned

on

the

main

PWB.

12

MAINTENANCE

4.1 Fault location

Faults

will

appear

as

abnormal

outputs

from

the

oscillator

or

as

calibration

inaccuracies. The nature

of

the

abnormality

allows the area in

which

the

fault

is

located

to

be

narrowed.

The

oscillator

has

been designed

to

allow

access

to

most

of

the

components

by

removal

of

the

case.

Position

the

carrying

handle

as

in

fig

4.1

thereby

allowing

access

to

the

four

case-fixing screws. Unscrew

with

a Posidrive

No.

2 screwdriver, the

four

screws on each side

of

the

case

and

then

remove

the

handle,

while

pulling

outwards

as

shown

in

fig

4.2

to

avoid scratching the

case.

I

~-

.

~~

U 0

Fig 4.1

5ine-~Quare

Oscillator

550603

SECTION 4

[@]

Fig

4.2

The

top

and

bottom

halves

of

the cover can

then

be

I

ifted

off.

The

chassis

formed

by

the PWB and

front

and rear panels

is

strong

enough

for

normal

handling

during

maintenance.

Positions

of

components

and test

points

referred

to

in

the

following

tables can be

found

by

reference

to

the

component

diagram

fig

4.3

and

the

complete

circuit

diagram fig

4.4.

4.2

Preset Controls

Before assuming a

fault

condition,

check

that

the preset

controls

are

not

in need

of

adjustment.

The

following

is

a

list

of

the

controls

and

the

malfunctions

that

can

occur

if

the

controls

are

improperly

set.

13

Feedback

Instruments

Ltd

Symptom

Amplitude

of

sine wave

wrong

DC

offset

on

square

wave

and

sine wave

DC

offset

on

sine wave

Mark/Space

ratio

of

square

wave

Frequency

calibration

out

at

all

frequencies

Frequency

calibration

at

1MHz

Control

R27

R41

R36

R32

Positions

of

frequency

knob

and

dial

on

shaft

C7

4.3 Setting-up Procedure

This

is

a

procedure

for

bringing

the

SS0603

up

to

specification

-

it

is

not

a

fault-finding

procedure,

although

failure

to

set-up

will

indicate

a

fault

condition.

1.

Select

square

waveform

and

display

the

SS0603

output

at

maximum

amplitude

on

an oscilloscope.

Set

the

SS0603

to

about

1kHz

on

the

1

to

10kHz

range.

Then

adjust

potentiometer

R41

to

bring

the

square

wave

symmetrical

about

0 volts.

2.

Select

sine

waveform

from

the

main

output

and

adjust

potentiometer

R36

so

that

the

sine wave

is

also

symmetrical

about

0 volts

and

adjust

poten-

tiometer

R27

so

that

the

maximum

pk-pk

sine

amplitude

is

15

volts.

3.

Return

to

square

waveform

and

adjust

potentio-

meter

R32

to

bring

mark/space

ratio

to

unity.

14

4.

While still

on

1kHz

to

10kHz

range

adjust

the

position

of

the

dial and

knob

on

the

dual-gang

capacitor

shaft

so

that

the

SS0603

generates

10kHz

when

the

dial

indicates

10kHz.

Check

other

graduations

to

be

within

±5%

of

frequency.

5.

Switch

to

the

top

of

the

frequency

range

and

adjust

capacitor

C7

to

make

calibration

at

1MHz

correct.

4.4 Diagnostic Table

Unless

otherwise

stated,

set

the

controls

on

the

in-

strument

as follows.

Frequency

range

1kHz

to

10kHz

Frequency

dial

1.0

Output

amplitude

maximum

Waveform

Sine

Sine-Square Oscillator

SS0603

Symptom

Power

indicator

lamp

not

lighting

Failure

to

function

properly

Failure

to

function

Across

D2

8.25V

±0.5V

TR7,

TR12,

TR3, TR5,

properly

TR19,

TR8

Failure

to

function

Across

C1

7.5V

±1V

TR8, TR7,

TR

1

properly

Failure

to

function

properly

Failure

to

function

properly

Failure

to

function

properly

Test

point

Check

power

supply.

Check fuse.

+ve line

-ve line

Across

D1

Across C7

Across R45

(+ve

supply)

current

Across

R46

(-ve

supply)

current

Correct

output

at

Test

Point

Voltage in range

100·125Vor

200-250V

+25

±5V

-25

±5V

8.2V

±0.5V

OV

±0.2V

2.6

±0.3V

(Note

{these

(values

(apply

{only

2.35

±0.3V

(for

(sine

(output

Probable

location

of

fault

Power

supply

Power

supply

or

SiC

on

lines

TR2,

TR14

TR9.

10,

11

(inside

box)

Excessive voltage

implies excess

current

and

short

circuits.

Look

for

burnt

components.

Low

readings

suggest olc

components.

15

Feedback

Instruments

ltd

4.5 Component Replacement Table

The

SS0603

is

not

critical

with

regard

to

component

types

but

proper

performance

can

only

be

expected

if

component

replacements are

of

reasonably

similar

types.

A

brief

general

specification

of

suitable com-

ponents

is

listed together

with

a

look-up

table.

Component

Resistors

Spec

Component

Spec

Component

Spec

Component

Capacitors

Spec

R1

A R16 B R31 A

C1

Q

R2

Thermistor

R17 B R32 E C2 P

R3 A R18 B R33 A C3J M

R4 A

R19

B R34 A

C4

R5 A

R20

B

R35

A C5 L

R6 A

R21

B R36 E C6 P

R7 A R22 B R37 A

C7

L

R8 A R23 A R38 A C8 Q

R9 A R24 A R39 A C9 Q

Rl0

A R25 A R40 A

Cl0

Q

R

11

B R26 A

R41

E

C11

Q

R12 B R27 E R42 A

R13

B

R28

A

R43

H

R14 B R29 A R44 A

R15 B R30 A R45 A

R46 A

16

5ine-5qudre Oscillator

550603

Spec

TVp(!

Rating

Tolerance Fixing Position

A

Resistor

1/8W

or

more

5%

or

less PWB

hole

ctrs

0.6"

Rl,

R3

to

10,

Res. dia. less

than

R28

to

31,

R33

to

~5,

0.2"

R37

to

40,

R42,

R44

to

46.

B

Resistor

1/8W

1%

Mounted

on

Rllto22

frequency

switch

E

Preset

carbon

O.lW

or

more

20%

or

less

See

fig

4.3

R27,

R32,

R36,

R41

or

Cermet

pots

H

Potentiometer

'hW :!:10%

15/16"diam.

R43

wirewound

1"

shaft

lkD

5/8"

FMF

K

Capacitor

100V

±2'h% see fig

4.3

C5

L

Capacitor

100V

PWB

centres

C7

compression

0.6"

0.4"

wide

M

Jackson

Bros.

type

P222

two-gang

510pF

per

section

C3,C4

P

Capacitor

See

fig

4.3

C2,C6

Ceramic

Q

Capacitor

35V

wkg

-20 +

80%

Cl,C8,C9,Cl0,Cll.

Electrolytic

17

I

Feedback

Instruments

Ltd

Transistors

If

the

Ferranti

transistor

types

are

not

available

the

following

types

bearing

EIA

or

Pro-Electron

type

num-

bers

may

be

used.

This

table

does

not

imply

that

the

types

listed

are

equivalents

in

any

other

situation

-~_~_~--,a;_~--=~-C-K-f-----=-;_~A_9-=-3-0--+--

:~~~~~tron

ZTX213CK

2N3251 BC213C

ZTX313CK

2N2369 BSX20

Other

components

are listed

below

with

the

Manu-

factu

rer'

s na

me.

Circuit

ref

Type

No

Manufacturer

=T--=R--=9:-------1--

J

-:-'4'-":-::2:----+--

Si

Iiconix

R2

RA54

STC

Other

components

including

mains

transformer

and

switches

are

supplied

to

Feedback

specifications

and

should

be

ordered

through

Feedback

Instruments

Limited,

Crowborough,

Sussex.

Returned

instruments

Should

the

instrument

be

returned

for

repair

and

recali-

bration

at

any

time,

the

mains

plug

should

be

removed,

as

no

provision

for

the

plug

is

included

in

the

packing

when

we

return

the

instrument

to

you.

The

address

to

which

an

instrument

should

be

returned

is:

Feedback

Instruments

Limited,

Serv

ici

ng

Department,

Park

Road,

Crowborough,

TN6

2QR,

Sussex,

England.

__

I

dr

,,"e

I

,}'

Sine-Square

Oscillator

550603

41

,.

R46

--rr:::r

"'"

R4S

,

---.z----,b,.c.

lO

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e-qD-

;-00-

r.:l

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tJ

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R34

R38

'-OD-

U

R41

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r:l

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R24J;J

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;:~_·'x<·,--

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19

feedback 550603 User manual

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