Exact 240 User manual

ELECTRONICS,

INC.

INSTRUCTION

MANUAL

240 s/n _

J.O.

33A1-8-376-J

llectronics,

Inc

~

INSTRUCTION

MANUAL

Type

240

sin--

455 S.

2N

D

AVE

.

HILLSBORO, OREGON

PHONE (503) 648-6661

TWX

(503)

821-6927

Copyright

©

1962

by

Exact Electronics, Inc., Hillsboro,

Oregon.

Printed

in

the

U.S. A.

All

rights reserved. Contents

of

this

pub-

lication

may

not

be

reproduced

in

any

form without permission

of

the

copyright

owner.

240-0664

SECTION

I - -

1 . 1

1.2

1.

3

1.

4

1.

5

./NOEX

SPECIFICATIONS

FRONT

PANEL

FAMILIARITY

PURPOSE

OPERATION

APPLIC,;TIONS

OPERATION

SECTION

I I .- -- - - - - - - - - - - - - - - - - - - - - -

-MAINTENANCE

2.

1

2.2

2.3

2.4

2.5

2.6

BLOCK

DIAGRAM

CHASSIS

LAYOUT

CIRCUIT

DESCRIPTION

TROUBLESHOOTING

PROCEDURE

RESISTANCE/DC

VOLTAGE

CHARTS

WAVEFORM

CHART

SECT.I

ON

I I I - - - - - - - - - - - - - - - - - - - - - - -

CAL

I

BRAT

I

ON

3.1

POWER

SUPPLY

3.2

TIMING

3.3

TRIANGLE

LINEARITY

3.4

SINE

WAVE

CALIBRATION

3.5

DC

LEVELS

ANO

OUTPUT

AMPLITUDES

SECTION

IV

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

PARTS

LIST

SE

CT

I

ON

V - - - - - - - - - - - - - - - - - - - CIRCUIT

DIAGRAM

I

I 240-0664

SECTION

I OPERA

TJ

ON

1.1

- - - - - - - - - - - - - - - - - - - - - SPECIFICA

TIONS

1.2

- - - - - - - - - - - - - - -

FRONT

PA

NEL

FAMILIARITY

1.3

- - - - - - - - - - - - - - - - - - - - -

PURPOSE

1.4

- - - - - - - - - - - - - - - - - - - -

OPER

~

TION

1.5

- - - - - - - - - - - - - - - - - - - - - - APPLICA

TION

S

I

TYPE

240

FUNCTION

GENERATOR

TYPE

240

FUNCTION

GENERATOR

TYPE

240 FUNCTION GENERATOR.

Here's

a

Function

Generator

that

simultaneously

produces

four

separate

outputs.

Three

of

the

outputs

are

fixed

amplitude

square,

triangle

,

and

sine

wave-

forms.

The

fourth

output (MAIN)

is

switched

to

provide

any

of

the

three

waveforms

,

with

adjust-

able

amplitude

and

reference

l

evel.

Th

e 240

is

a

reliable

general

purpose

Function

Generator

for

use

in

circuit

design

;

equipment

checkout

and

cali-

bration,

and

in

quality

control

applications.

SIMULTANEOUS OUTPUTS. All

outputs

of

the

240

are

simultaneous

and

synchronized

throughout

the

frequency

range.

Phase

relationship

is

unique

in

that

the

triangle

and

sine

waveform

peaks

occur

at

the

rise

and

fall

points

of

the

square

waveform.

MAIN OUTPUT

REFE

RENCE

LEVEL.

The

main

output

reference

leve

l

control

enables

the

output

waveform

·

reference

level

(center

of

triangle,

sine

and

square)

to

be

shifted

between

-15

and +15

volts

or,

in

the

switched

position,

set

to

approximately

O

volts.

Also,

circuit

ground

can

be

either

strap-

ped

to

chassis

ground

or

left

isolated.

PACKAGING.

The

240

is

5-1/4

" high by

15-1

/ 2"

wide,

and

weighs

only 18

lbs.

net.

The

240

can

be

supplied

in

rackmount

version

(240RM)

at

no

addi-

tional

cost.

F-ront

panel

is

dark

grey

in

color,

with

silkscreened

white

callouts.

End

bells

and

cabinet

are

medium

grey.

All

exterior

finishes

are

oven

baked

for

durability.

*

SIMULTANEOUS

OUTPUTS

*

SQUARE

-

TRIANGLE

-

SINE

*

300mv

to

25

volts

P-P

*

0.001

to

10,000

KC

EXACT

ELECTRONICS

INC.

455

S.E.

2nd

Avenue,

Hillsboro,

Oregon

97123

------------

,RINTED

IN

U. S.

A.

S-240.3

Se

l

ects

o

ut

put

freq

uen

cy

range.

Adj

us

ts

output

fr

equen

cy

. Sel e

cts

M

AIN

out

put

wave

form

Adjust

s

MAIN

ou

tp

ut

P

ower

swit

ch

Adj

u

sts

de r efer ence

MAIN

Straps

c

irc

u

it

gr ound

to chas

sis

g

rou

nd.

level of

MA

IN ou

tput.

o

utput

SPECIFICATIONS

MAIN

OUTPUT

Amplitude

*. • • . . . . . . 300

mv

to

25

volts

P-P

(min)

• • • . . . • . . . . . . . . 25

volts

into

5K

load

Stability

/Repeata

bility

••••••

• 50

mv

(10

min),

150

mv

(24

hrs)

Amplitude

Change

with

Frequency

. . . . .

0.5

%

to

lkc

1%

to

lOkc

Amplitude

Chang

e

with

Function

• • • • • . . . 1%

max

DC

Reference

Lev

el

Range*: • • •

-1

5

to

+15

volts

or

switched

to

O

volts

Frequency

Range

•

•••.•......

0.001

cps

to

10 kc

Frequency

Devia

ti

on

from

Absolute

. • • . . • 3%

max

Long

Term

Freque

ncy

Stability

. • . . . . . . . . . • ±1%

POW

ER

REQUIREM

ENTS

Line

Voltage.

. . . . . . . . 105

to

125

or

200

to

250

vac

Line

Frequency

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

50

to

400

cps

Power

......

..

.

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

125

watts

PHY

SICAL

CHARA

CTERISTICS

Weight

.......

........

18

lbs

net,

25

lbs

gross

Vo

lume

. . . • . . . . • . . . . . . . . . . . . . 2

cu

ft

gross

Dimensions

....

. . . .

....

15-1/2w

X

5-1/4h

X 13d

1

13

1

SQUARE

WAVEFORM

Risetime

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

usecs

or

faster

Symmetry

.....

,

.......

,

......

, , , , 99.

5%

Overshoot

.................•

, . , . , 1%

max

Droop

. . . . . . . . . . . . . . . . . . . . . . . . . . 1%

max

TRIANGLE

WAVEFORM

Linearity

. . . . . . . . . . . . . . . . . . . . . . . . 99.

5%

Symmetry

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

, , ,

..

, . ,

..

, .

99.

5%

SINE

WAVEFORM

Total

Distortion

..

Less

than

2%

over

entire

freq.

rang

e

AUXILIARY

OUTPUTS

Amplitude

*. • • . • • • • • • • • • • • . 30

volts

P-P

(min)

• • • . • . • • . • . . • • . • . . 30

volts

into

7K

Stability/Repeatability

• . • • • • • • •

(same

as

main)

Amplitude

Change

with

Frequency

• •

(same

as

main)

DC

Reference

Level

• . • • • • . • • • . . • 0

volts

(fixed)

Frequency

Range

••••.•.•

Synchronized

with

m

ai

n

*

Max

Current

. . . . . 15

ma

@ +15 vdc

reference

l

evel

.

..

...

3

ma

@

-15

vdc

reference

level

PRICE

F.

0.

B.

Factory

AUX

ILIARY

OUT

PUTS

MAIN

O U

TPUT

• • •

For

the

location

of your

nearest

representative

,

consult

Electroni

c

En-

gineers

Master.

• • •

$4

75. 00

II

EXACT

:-

ELECTRONICS

INC

.

.455

··.S~

E.

2~d

.

Ave

.

nue,

Hillsl:>'oro,

Oregon

97123

Telephone

(503)

6.48-6661

0

TWX:

503-821-6927

6-64

I

SECTION I---------------------------------------------

OPERATION

1.1

SPECIFI

CATIONS

(CONT I

NUED)

DJMENSfONS:

RACKMOUNT

ST

ANDA

RD

l-·--

-•1

3"

1 -1

-t

------·15

11

--

-

-~

II

•

THESE

MEASUREMENTS

ARE

CORRECT

WITHIN

:

1/16"

DUE TO THE

CAS

TIN

G OF THE

ALUM

I

NUM

ENOBELLS.

I

-

•

I

•

I

•

SEC

TIO

N I

----------

-

--

- - --

--

-~-

----

-------

----

-----------~---OPERATION

1.2

240-0664

FRONT

PANEL

FAM

IL

IARITY

1.2.1

TlMING

MUL

ilPLlER

'1

"TIMING

...

....

-o\

I/-

'

,,,

....

.......

--

-,

...

(A)

TIMING

RANGE

.001

CPS

TO

10,000

CPS

(a)

TIMING

AC

CURAC

Y MAXIMUM

2%

OEVIATtoN

BETWEEN

ANY

coMe1-

NATtON

OF

MULTIPLt£R

ANO

DIAL

S£TTING

AND

ABSOLUTE

TIME

(c)

TIMING

STABILITY

MAXIMUM

1%

DEVIATION

FROM

ORIGINAL

SET

FREQUENCY

OVER

A 24 HOUR

PERIOD.

TIMING

I S

MORE

CRITI-

CAL

AT

X1

ENO

OF

THE

CYCLES/SEC

OIAL

1. 2. 2

OUTPUT

-~

lo\A\t~

I

C.KT

"'"c."~

~

G~D

OUTPUT

GND

(A)

TIME-PHASE

RELATION

OF

OUTPUTS

SQUARE.

TRl

P\

NGLE.

SI

NE

I

•

I

II

I

I 240-0664

SECT

IO

--

-

----

-

-------

---~----------------------

--~----OPERATION

1. 2

.2

.

OU

FUT

(CONTINUED

"!

DC

LEVE:L

(

s)

1AIN

OUT

PU

T

(1)

A

PLiTUDE

(2)

DC

COMPON

E T • "

(3)

STABILITY

(4)

IMPEDANCE

+

300

V T O AT

LEAST

25v

pp

Ftxto

AT

ZERO

VOLTS

OR

VARI

A

BLE

FROM

-13v

T O

+13v

(MINIMUM

RANGE)

50MV

SHORT

TERM

'

150M

V

LONG

TERM

INT

i

I =

AP

PRO'X

ZOO

..Cl.

J5MA

MAX

3MA

AT

-J3V

DC

L.EVEl..

(c)

PO

LARJTY

CiRCUI

T ~

ROU

O

CA

N BE I

SOLATED

FROM CAB I

NET

GROUNO

BY

REMO

ING

TH ~

NTERCONNECTING

ST~AP

. T

HE

O

UTPUT

WILL

NOW

BE

rLOATI

G• I F YOU DO NO T LOAD

THE

OUTPUT,

TH

fRE

WILL

SE

S

O~

E

HUM

P

ICK

UP A

ND

A 1 µ

FD

CAPACITOR

SHOULC

BE

PL

AC

ED

· BE

TW

EE

TH

E

TWO

GRO

U

ND

POST

S a

MA't1UM

ELE

VA

T

ION

POTENTIAL

--

50

V

(o)

DC

LEVEL

THE ABOVE K

ETC

H t LLU

STRATES

THE

OP~R

TION

~NO RAN G£

o~

THE~

DC

LEVEL

POTENTIOMETER.

WHEN

THIS

POTE

NTIO-

MET

ER

IS

JN HE

"S\,,IIT

8

H£0

1f

OR

ll(,II

P

OSITION

, THE

WAVE-

FORMS

SH

OULD

HA

VE A

CE

NTER

O

DC

L

EVE

L .

INTERN

AL

AD-

J~ST

M

ENT

S ON

LL

WAV

EFORM

E

ASSURE

THI

T

THIS

CAN

ALWAYS

B E TR

UE.

: THE SINE ANO SQ

UA

RE

OFFSETS

ARE

SIMILAR

TO

THE

ABOVE

TRIANGLE

OFFSETS.

I

240~664

SECTION

I-------------------------~------------------~------

OPERATION

1~2.2

OUTPUT

(CONTINUE~)

(£)

AMPLITUDES

THE

AMPLITUOES

OF ALL WAVEFORMS AR~ THE SAME

WITHIN

2%.

INTERNAL

ADJUSTMENTS

ON

THE SQUARE

ANO

TRIANGLE

WAVEFORMS

ASSURE

THAT

THEIR

AMPL!TUOES

CAN

BE

ADJUSTED

'TO

WITHIN

2%

OF THE

SJNE

WAVE

AMPL~TUOE.

(~)

31MULTANEOUS

OUTPUTS

THE

SIMULTANEOUS

OUTPUT WAVEFORMS ARE

AT

A

FfXEO

QC

LEVEL

(iN~ERNAL

ADJUSTMENT).

THE

AMPLSTUOES

Or

TH£

SQUARE

ANO

TRIANGLE

WAVEFORMS

ARE

INTEP.NALLY

AOJUST-

ABLEo

LEVEL

cP-o

l£VEL

I

240-0664

SECTION

l

-~-..-----------------------------------------

·-------

...

----

OPERATION

1.4

PURPOSE

THE

GENERAL

PURPOSE

OF

THE

TYPE

240

IS

TO

GENERATE

SQUARE,

TRIANGLE

AND

SINE

WA

VEFORMS

OVER A

CONTINUOUSLY

VA

RIABLE

FREQUENCY

RANGE OF

0.001

CPS

TO

10,000

CPS .

THESE

WAVEFORMS A

RE

AVAILABLE

SIMULTANE-

OUSLY

FROM

THE

DESIGNATED

JACKS

ON

THE R I GHT

HAND

SIDE

OF

THE

FRONT

PANEL

AND/OR

SINGLY

AS

SELECTED

FROM

THE

MA

IN

OUTPUT

TERMINAL•

OPER

A

TION

FOR

FIRST-TIME

OPERATION,

THE

FOLLOWING

PROCEDURE

SHOULD

BE

USED:

(A)

CHECK

FOR

STRAP

BETWEEN

THE

GROUND

POSTS.

(e)

SET

THE

PO

WER

sw1TcH

To

ON.

(c)

ALLOW A

TEN-MINUTE

WARM-UP

PER

I

OD.

(D)

SET

THE

OUTPUT

sw1TcH

TO

TRI

A

NGLE

w~

VEFORM.

(E)

TURN

OUTPUT

ATTENUATOR

(RED

CONCENTRIC

KNOB)

FULLY

CLOCKWISE.

(F)

SET

THE

TIMING

MULTIPLIER

SWITCH

AND

CYCLES/SEC

DIAL

TO

THE

DE-

SIRED

F"REQUENCY.

(G)

S

ET

THE

±DC

LEVEL

TOO

. ( S

WITCH

CLOSED)

POSITION

OR

TO

THE

OUT-

PUT

LEVEL

DESIRED.

(H)

CONNECT

THE

MA

IN

OUTPUT

AND/OR

SIMULTANEOUS

OUTPUT

TO

THE

SYSTEM,

CIRCUIT,

AND

OSCILLOSCOPE,

ETC.

(J)

CONNECT

THE

SIMULTANEOUS

SQU

A

RE

WAVE

OUTPUT

TO THE

EXTERNAL

TRIG-

GER

INPUT

OF

THE

MONITOR

OSCILLOSCOPE.

1.5

APPLICATIONS

(A)

GENERAL

WAVEFORM

SOURCE

FOR

RESEARCH,

ANALOG

COMPUTERS

AND

SYS-

TEMS

CHECKING

(B)

THE

LOW

FREQUENCY

SQUARE

WAVE

FOR

RESPONSE

CHECKS

(c)

THE

TRIANGLE

AS

RASTER

GENERATOR

(D)

LINEARITY

CHECKING

OF

INSTRUMENTS

OR

SYSTEMS

BY

VARYING

QC

LEVEL

AMPLITUDE

OR

FREQUENCY

WHILE

HOLDING

ONE

OR

BOTH

Or

THE

OTHER

PARAMETERS

CONSTANT

(E)

W

AVEFORMS

CAN

BE

DIRECTLY

MIXED

BY

PATCHING

TOGETHER

THE

SIMUL-

TANEOUS

AND

MAIN

OUTPUT

AT

THE

FRONT

PANEL

TO

PRODUCE

COMPLEX

WAVEFORMS.

IF

YOU

WISH

TO

QC

OFFSET

SOME

OF

THE

SIMULTANEOUS

OUTPUTS,

INTERNAL

ADJUSTMENTS

CAN

BE

MADE.

I

I 240-0664

SF CT/ON II

2.

1

2.2

- - - - - -

2.4

2.

3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.

4

.1

2.4.2

2.4.3

2.4.4

2.4.5

MA/t

JTEN

ANCE

- - B

LOCK

DI

A

GR

AM

CH

ASSI S

LAYOUT

-

CIR

C

UIT

DESCRIPTION

PO

W

ER

S

UPPLY

SQUA

RE

W/

VEFOR

M

GENER

A

TOR

TRI

A

NGLE

WA

VEFORM

GENER

A

TOR

S

INE

WA

VEFORM

GENER

A

TOR

MAIN

OUTPUT

S

IMULT

A

NEOU

S

OUTPUTS

TROUBL

ES

HOOTING

PROCEDURE

PO

W

ER

S

UPPLY

SQUhRE

~JA

VEFORM

TRI

A

NGLE

WA

VEFORM

SI

NE

WA

VEFORM

DC

LEV

E

LS

2.5

- - - - - - - - - - - - - -

RESI

STA

NCE/DC

VOLT

A

GE

CH

A

RT

S

PO

WE

R SUP

PLY

R

ES

I

ST

J

NCE

,

ND

'

DC

VOL

T/

GE

CH

A

RT

MA

IN

CH

AS

SI S

RE

SISTA

NCE

A

ND

DC

VOLT

A

GE

CH

A

RT

2.6

- - - - - - - - -

WAVEFOR

M A

MPL

rTU

DE

A

ND

DC

LEVEL

CH

A

RT

To

ASSURE

DRIFT-FREE

OPER

A

TION

WITHIN

CA uT!ON

THE

INSTRUMENT

CAPABILITIES,

A

GED

TUBES

SHOULD

BE

USED

FOR

REPLACEMENT.

..

.

~

..

V!OS

M

5QUARE.

WAVE

MULTI

t

TIMING

V

/02

TR

IANGLE

INTEGRATOR

I

-~

MILL[R

DC.

B~L

V/04

S\NE

SHAPER

.-

..

---

· -

......

TYPE

240

BLOCK

DIAGRAM

~

C.101

\0FT

V

!OIB

SQUARE

MULTI

CF

C'<CLEs/sEC

y

SQUI\RE.

'?

5YM

XIO

>

~

5QUl'\RE.

~

SY!'<\

Xl

~

C

S\NE.

SHAPE.

_A\A

~

V"(V-

I A

MUL

Tl

PLIE.R

0

~

....,.

I f 1 $S\NE. 51-\~PE.

B

~

SINE.

?

SHM>E.

TR\1",NC.LE.

SQUA

RE.

>

AM

PL

>

t---~"

SQUARE

~

LEVE.L

LEVEL

~

-5

TRI.-.NG-LE.

l

AMPL

'.:>INE.

y

LE-VEL

"<>

V!O!A

50UARC

WAVE

CF

OUT

I

V/038

TR

IA

N

GLE

CF

OUT

I

VI03A

SINE

WAVE

CF

OUT

l

SOU

A.RE

TRIP..NGLE.

SI

NE

~

OUTPUT

( r

~

l

!j

[)-

~~~~~~~~~~~~~~~--'

t.

DC

L

~~mw

~

MIN

I\M

P

DC.

BAL

V/06

MAIN

OUTPUT

CF

I

MAIN

I

240-0664

SECT

IO

N

tt

----------------------

-

---------------

-

---

-------

MAINTENANCE

2.2

CHASSIS

LAYOUT

10

TG

06

MA\N

(9T\MiNG

><-

i ©

'\

':>QUP.RE.

5

'(

t-\

:(10

~y"

,

HI • 11I I I I G

11

T BIo+

~

8 4 2

5

Vl

02.

V\03

V

104

(/)

UJ I i i i i • • • n

19103

&

..._

a

l\

s l I T 3

IO

2

IJl

6• i

01

C\0

3

Te,os- H

.F.

"TRl

COt.i\P

R 2 3

y

-2\0V

~DJ

BOTTO

TO

0 SQU

"RE.

O c

LEVEL

(D

TRI

A.MP

,-,.

IJ\lLL~R

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-066

4

SECTION

I I

--

-

---

- -

---

-----

---------

- -

--

---

-

--

- -

--

---

----

--

MAINTENANCE

2.3

CIRCUIT

DESCRIPTION

2 . 3 . 1

POWER

SUPP

LY

THE

THREE

POWER

SUPP

LIE

S ARE

ALL

BASED

ON

THE

SAME

PRINCIPLE:

A DC

AMPLIFIER

IS

REFERENCED

TO A S

TANDARD

VOLTAGE

(A

5651

GAS

TUBE

OR

PRECISION

DIVIDE

RS FROM -

210V)

.

ANY

VARIATION

FROM

LI

NE

OR

LOAD

rs

AMPLIFIED

BY

THE

DC

AMPLIFIER

AND

PASSED

AL ONG AS A C

ON

TRO

L

VOLTAGE

TO

THE

SERIES

REGULATOR

TUBE .

THE

FILA

MENT SU

PPLY

I S REGU LA

TED

BY

A

TR~NS!S

TOR

REFERENCE

D

TO

A

Z

ENER

DIODE.

2.3

. 2 S Q

UARE

W~

VEFORM

GENERATOR

(A)

V105

IS

A

CATHODE

COUPLED

MU

L

TIVI

B

RATO

R.

ITS

OUTPUT

(PIN

#

6)

SWINGS

FROM

BELO

W

-1

00V

, WHEN

V105B

IS

CONDUCT-

IN

G ,

TO

+100V

WHEN

IT

I S CUT

OFF.

THE

TIME

DU

RATION

OF

EACH HALF

-CYCL

E

IS

DETERM

IN

ED

BY

THE

TRIANGLE

WAVEFORM

AT

GRID

P

IN

#9 OF

V10

5 A ·

THE

TRIANG

LE

NOW

DETERMINES

THE

SWITCH

ING

OF

THE

M

UL

T I

VIB

RAT OR .

THE

TRI

A

NGLE

M

UST

ALWAYS

PASS

THROUGH

THE

SAME DC

LEVELS

TO

SWITCH

V105

AND

THERE-

FORE

THIS

PARTLY

DETERMINES

THE

TIMING

OF

THE

INSTRUMENT

.

(B)

THE

LOOP

GAIN

OF

THE

CATHODE

COUP

LED

MULT[V!BRATOR

rs

DE-

TE

RM

INED

BY

I

TS

CATHODE

CURRENT

.

THIS

DETERMINES

THE

FINAL

TIMING

AND

IS

CONTROLLED

BY R1

05.

(c)

V1018

I S A

CATHODE

FOLLOWER

WHOSE

OUTPUT

HAS

THREE

FUNC-

TIONS:

(1)

SQUA

RE

WA

VE

SYMMETRY (

X10),

R111

PROVIDES

FOR

EQUAL

VOL T

AG

E

BUT

OPPOSI

T E

POLARITY

AT

X10

E

ND

OF

CYCLE

S

/SEC

DIAL

F

OR

EACH

HALF-CYCLE

OF

V105

.

(2)

PROVIDES

ST

AN

DARD

SQU

AR

E

WA

VE

TO

OUTPUT

CATH ODE

FOLLOW-

ER

V101

A.

(3)

PROV

IDE

S

SQUARE

WAVE TO MI

LLER

INTEGRATOR

T

IMING

RE-

SISTORS

AND

CAPACITO

RS

(R134-R136

AND

C1

02A

-

F).

2.3

. 3

TRIANG

LE

WA

VEFORM

GENERATOR

V102

IS

A M

ILLE

R

INTREGRATOR

AMPLIFIER

WITH

AN

ASSOCIATED

CATHODE

FOLLO

WER

.

THE

SYMMETRICAL

S

QUARE

WA

VE FROM

V101B

IS

FED

TO

GRID

# 2 OF

V102

AND

THE

INTEGRATOR

ACTION

PRODUCES

A

TRIANGLE

WAVEFOR

M AT

THE

CATHODE

(PIN

#8 OF

V102).

TIME

CONST

ANT S

FOR

THE

INTEGR

ATO

R ARE

C102

(A

-F),

R116

AND

R134,

R135

,

R136.

MILLER

DC BAL

R13

2

DETERMINES

THE

LEVEL

AND

AMP

-

LIT

UDE OF

THE

S

IGNAL

BEING

F ED BACK TO

THE

GRID

#9

OF

V105

.

2.3

. 4

SINE

WA

VE

FORM

GENERAT

OR

V104

IS

A

PENTODE

WHOS E

BIAS

CHARACTER

ISTICS

ARE

ADJUSTED

BY

THREE

S I

NE

SHA

PI

NG

A

DJUST

MENTS

,

R139,

R143

AND

R145

.

THE

LINE

AR

TRI

AN

GLE

FROM

V102

IS

SHAPED

BY

THESE

ADJUSTME

NT

S TO

PRODUCE

A

VERY

LOW

DISTORTION

SINE

WAVE

AT

THE

PL

AT E

# 5 ·

I

240-0664

SECTION

II

-------------------------

-

----------------------

-

MrilNTENANCE

2 . 3 . 4 S

INE

WA

VEFORM

GE

NER

A

TOR

(CONTINUED)

S

INE

,D

J '

(R139)

CONTROLS

THE

DC

LEV

EL OF

THE

GRID

.

S

INE

AD

J B

(R143)

CONTROLS

THE

AMPLITUDE

OF

THE

TRIANGLE

INTO

GRID

# 1 OF

V104

.

S I NE

AD

J c

(R145)

coNTRo

Ls

THE

suPPREs

s

oR

B1

As

oF

v104

.

2 . 3 . 5 MA IN

OUTPUT

V106

IS

A

CONVENTION

AL

CATHODE

FOL

L

OWER

.

THE

PROP

ER WAVEFORM

BEING

FED

TO

THE

GRID

I S

SELECTED

BY

THE

OUTPUT

SWITCH

,

SW

104

.

THE

QC

LEVEL

OF

THE

CONTRO

L

GRID

IS

DETERMINED

BY

:

(

A)

R158,

R159

AND

R161

IF

±DC

OUTPUT

LEV

EL

SWITCH

I S

CC'.,../

IN

SWITCHED

POSI

TIO

N.

(B)

R162

IF

±DC

OUTPUT

LEVEL

SWITCH

IS

cw

FR

OM

SW

IT

CHED P O

SI

-

TION

.

2 .

3.6

S I

MU

LT

ANEOUS O

UT

P

UTS

V1 0 1 A ,

V1038

A

ND

V10

3 r ARE

ST

ANDARD

CATHODE

FOLLO

WE RS

PROV

I D-

IN

G LOW

IMPEDANCE

OUTPUTS

FOR

THE

INDIVIDUAL

SQUA

RE

,

TRI

A

NGLE

AND

S I

NE

WAV

EFORMS

. TH E

SINE

WA

VEFORM

CATHODE

FOLLOWER

(V103

A)

HAS

A

DC

LEV

EL

CONTRO

L

ONLY,

W

HILE

THE

S QUARE WAVE

AN

D

TRI

ANG

LE

WAVEFORM

CATHODE

FOL

LOWERS

(V1018

AND

V103ff)

HAVE

BOT

H

DC

L EVEL

AND

AMP

LIT

UDE

CONTROLS·

2 . 4

TROUBLE

S

HOOTING

PROCEDURE

2 .

4.1

PO

W

ER

S

UPPLY

(

A)

ALL

CIRCUITS

DEPEND

ON

T

HE

REGU LATED -

210V

,

+1

QQV

AND

+250V

.

THE

MORE

CRITIC

AL

GENERATING

C I

RCUITS

ALSO

DE 0END

ON

T HE -

11V

FIL

AMEN

T REGU L A

TION

. A

LWAY

S CHEC K

TH

ES

E

SUP

-

PL

IES

FOR

CORRECT

VOLT

AGE A

ND

MINIMUM

RIPPLE

(BELOW

10MV

ON

HIGH

-VOLT A

GE

S

UPPLI

ES

AND

BELOW

100MV

ON

-

11V

SUPPLY)

.

(1)

FOR

-

210V

PROB

L

EM

S

CHECK

V1,

V2

AND

V3

;

CHE

CK

-

210

A

DJ

R23;

CHECK

DIODES

09

THROUGH

012

.

(

2)

FOR

+1

00V

PROBLEM

S

CHECK

-

210V

,

V3

AND

V4,

DIVIDER

VOLT

AGE AT

# 1

OF

V4

AND

DIODES

05

THROUG

H

08

.

(3)

FOR

+

250V

PROBLEM

S

CHECK

-210V

,

V5

AND

V6

,

DIVIDER

VOLT

AGE

AT

# 1 OF

v6

AND

DIODES

01

THROUGH

o4

.

(4)

FOR

-

11V

PROB

LE

MS

CHECK

Q1 ,

ZENER

DIODE

017

AND

DIODES

013

THROUGH

0 1 6 .

(B)

'

.,../HE

N E X

PERIEN

C

ING

HUM,

DRIFT

OR

JI

TTER

,

CHECK

THE

RE

GUL A-

TION

OF

THE

POWER SU

PPLIES

AND

/OR

INSU

RE

TH

AT

THE

STRA

P

I S

INSTA

LL

ED

BETWEEN

THE

CHASSI

S GROUND A

ND

THE

CIRCUIT

GROUND TERM I

NALS

.

I

240-0664

SECT

ION

I I

-------------------------------------------------

Mh

lNTEN

NCE

2.5

2 • 4 • 1 p 0 1

ER

:.;

up

p

Ly

( c

ON

T I Nu

ED

)

(c)

S

HORTED

RECTIFIER

DIODES

MAY CA

USE

FUSE

BLOWING.

2.4.

2 S QU~

RE

W

VEFORM

V10

5

GENERATES

THE

SQUARE

WA

VEFO

RM

.

T~E

FLIP

TIME

JS

DE-

TERMINED

BY

THE

TRI

AN

GLE

WA

VEFORM

PRESENT

AT

THE

GRID

(PIN

# 9

OF

V105)

WHICH

IS

DERIVED

FROM

V102

CATHODE

FOLLOWER.

PROB-

LEMS

INVOLVING

SQU ARE WA

VEFORM

ONLY

SHOULD

BE

TRACED

TO

V101

AND

V105

IN

TH

AT

ORDER.

IF

EXPERIENCING

AN

UNSYMMETRICAL

SQU ARE

WA

VEFORM,

VERIFY

THAT

THE

TWO

SYMMETRY

AD

JUSTMENTS

R111

AND

R120

ARE

CORRECT

(SE

E

PAR

A

GRPH

3.2.4).

2.4.3

TRI

A

NGLE

WAVE

FORM

V1

02

IS

A

MILLER

INTEGRATOR.

THE

INTEGR

ATOR

INPUT

IS

A

SQUARE

WA

VEFORM FROM

V1018.

THE

INTEGR

ATOR

OUPUT

IS

A

POSI-

TIVE

A

ND

NEG

AT

IVE

GOING

VOLT

A

GE

IN

THE

FORM OF A

TRIANGLE.

PROBLEMS

INVOLVING

TRIANGLE

ONLY

SHOULD

BR TR ACED TO

V1038,

V1

02

,

R133

AND

R105

SETTING

S IN

TH

AT

ORDER.

2.4.4

S

INE

W~

VEFORM

V1

04

SHAPES

THE

TRI

A

NGLE

WAVEFO

RM

INTO

A S

INE

WA

VEFORM.

THIS

SHAP

ING

DEPENDS

ON

ACCUR

A

TE

SYMMETRY

OF

THE

SQU

ARE

AND

TRI-

ANGLE

WA

VEF

O

RMS.

THE

INPUT

DC

LEVEL

AND

AMP

LITUDE

OF

THE

TRIANGLE

WAVEFORM ARE

CRITIC

A

L.

LL

A

ND

CALIBR

A

TION

P R

OCEDURES

SHOULD

BE

CHECKED

BEFORE

FURTHER

TROUBLESHOOTING

OF

THE

SINE

WAVEFORM.

ONLY

THEN

SHOULD

PROB-

LEM S BE

TRACED

TO

V103

,

V102,

S

INE

S HA

PE

A

DJUSTMENTS

(R139,

R143

AND

R145)

A

ND

SINE

DC L

EVE

L

R154

IN

THA T

ORDER.

2.4.5

DC

LEV

ELS

INCORRECT

DC

LEVELS

OF

OUTPUT

WAVEFORMS

MAY BE CA

USED

.

BY

JN-

~O

RR

ECT

INTERN

AL DC

LEVEL

A

DJUSTMENTS

(

SEE

PARAG

RAPH

3.5).

RESI

ST A

NCE

A

ND

DC

VOLT

AGE CHriRT S

2.5.1

PO

WER S

UPPLY

RE

S I

STA

N

CE

A

ND

DC

VOLT

AGE CH

AR

T

(

A)

RESISTANCE

MEASUREMENTS

THE

RESISTANCE

ME

A

SUREMENTS

WERE

MA

DE

ON

A COLD

INSTRUMENT

WITH

CONTROLS

SE

T AS

FOLLOWS:

M

ULTI

PL

I

ER

CYCLES/SEC

DIAL

AT

TENU

AT OR

PO

wER

OFF

-ON

100

10

FULL

C1

J

OFF

I

-

'

II

240-0664

SECTION

I I

-------------------~----~----------------------

MAINTENANCE

2.6

2.5.1

POWER

SUPPLY

RESIST

A

NCE

AND

DC

VOLTAGE

CHART

(CONTINUED)

(s)

DC

VOLTAGE

MEASUREMENTS

(1)

THE

DC

VOLTAGE

MEASUREMENTS

WERE MADE

WITH

A VTVM

HAVING

AN

11

MEGOHM

INPUT

RESISTANCE.

THE

INSTRUMENT

INPUT

VOLTAGE

WAS

ADJUSTED

TO

117

VAC

(2)

THE

FUNCTION

GENERATOR

CONTROLS

WERE

SET

AS

FOLLOWS:

MULTIPLIER

CYCLES/SEC

DIAL

ATTENUATOR

PQ

l,.J

ER

OFF-ON

100

10

FULL

cw

ON

2.5.2

MAIN

CHASSI

S

RESISTA

r·

cE

AND

DC

VOLT

AGE

CHART

(A)

RESISTANCE

MEASUREMENTS

THE

RESISTANCE

MEASUREME

N

TS

WERE MADE

ON

A COLO

INSTRUMENT

WITH

THE

INSTRUMENT

CONTROLS

SET

AS

FOLLOWS:

MULTI

PL

I

ER

CYCLES/SEC

DIAL

ATTENUATOR

PO

,.

JER

OFF-ON

(s)

DC

VOLTAGE

MEASUREMENTS

100

10

FULL

C;,J

OFF

(1)

THE

DC

VOLTAGE

MEASUREMENTS

WERE MADE

WITH

A VTVM

HAVING

AN

11

MEGOHM

INPUT

RESISTANCE.

THE

INSTRUMENT

INPUT

VOLTAGE

WAS

ADJUSTED

TO

117VAC.

(2)

THE

FUNCTION

GENERATOR

CONTROLS

WERE

SET

AS

FOLLOWS:

MULTI

PL

I

ER

CYCLES/SEC

DIAL

ATTENUATOR

PO

WER

OFF-ON

WAVEFORM

AMPLITUDE

AND

DC

LEVEL

CHA

RT

100

10

FULL

CW

ON

THE

WAVEFORM

AMPLITUDES

AND

DC

LEVELS

WERE

MEASURED

USING

A

TEKTRONIX

TYPE

532

OSCILLOSCOPE

WITH

A

TYPE

CA DUAL

TRACE

PLUG-IN.

I

I 240-0664

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ON I f

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DC

VOLTAG

E

AND

RESIST

A

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II

240-0664:

SEC

TION

11

--------------

-

---------

----

-

-------

---

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-

MAINTENANCE

MAIN

CHASSIS

DC

VOLTAGE

A D

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SI

STA

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eXact 240 User manual

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