Kikusui Electronics Corporation ORC-27A Service manual

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Type

1U SPECIFICATIONS

Wien Bridge

-

Oscillator

RC

-3-

Power
Dimer;sions

Worght
Vacuum

Accessones

Frcquency

Calibration

f'requency

Rcqui::ement

(

Mar"

Tube

)

Rangc

Accuracv

regulation

24C

JOO(W)

toOiw)

Approx.

-y,

50,/6OH:-

r 1'70(U) :;

1s0(u)

x

5kg

5AV6
6AR5
1zAT

7

6){4

Operation I\4anual
Test

Data

xl

1O

x

1OO

x

1k

x

From 18tlz
For

AC

to loOkl{z

-?.40_V,

Approx,

153(D) mm

x 110(D) mm

!

,

5%t

Less

t

3ovA

1
2
1

4

I

:a'
:1

1

-

18
1BO - 2OOOHz
1

800

18 - 200kHz

(2%

+

1

t{z

than

*

2OOHz

-

20000Hi

)

1%

Frequency

Maximum Output

'

Distortion
Sag

.

or

Complex

Output

o-f

Overshoot

Wave

Impedance

response

Sinc

Wavc

of Sqare

Sine
Square : Less

Sine :
Squa.re ; more
Complex

l,css than 1

Wave

Basc
Superposed Wave lBHz
Amplitude

: Less

more ttran 5 V

: morc than 1O Vp-p

/

7

,

Lo=" than

Lcss than

Less tiran

(

referencc : 1

f,

Ratio

3

j

than

at

kil

O,5 dB

than

i 0,5 dB

than 10 Vp-p

1kl1z

1 clB

1

rms

(

reference

kHz

up to

)

line frequency

-

?OOkHz

Approx,

{;1

: l

2Okllz

kHz

)

2o

FLTNCTION

oRc,27A

OSCILLATOR

OI"CTONTROLs

AND TERIutNALb

-A

-

Frccluencl-

/\

I"requenc

control

,

Auo

-2

I

u'aveform

Output

L'eve.I

Por,r'cr

OutJrut

srvitch

tcrminals

Rcmovc
of

thc:rmi

this panel

stcr

for

replacement

r

.}"1

INI'IIAL

-3"

PROCIIDURII

q

OPERATION

I RIiQUIINCI

3.2

Conrrect

tire

porver
frcquettc','"
u'ill

light

and tirc

-up"

Se:t

It

will ber w-itliin

tlto

RANGE

Thc frequencv

indicated
llxAtvIPLE:

RANGIT

When

CON4PLEX,

of

b5'

1oo

:IWITCH

the

rot:rr-v s'.vitch

Turn

and

di:rl

the

(

thc

RANGtr

ca=irlc to a po.,\er

pol,er

the

irrstrument

sn'.tch

will

specifications

li'RFjQUIINCY

scal"e

on clial

settilir

r.a.luc ol.,taincd

must

be

sn,itch

scale

r'^,irich sclccts

)

:

setting

)

t tUz

line of thb

to

ON.,

opcratc

after

cor.rtrols for

multpliccl

to

(multiplS,ing

1o

x

WAVEFORIyi

above

is

snecifietl

'1'hc

lamp

aftcr a

3O

fe:w

minutcs.

thc clcsired frequcrrcl,-"

thc

i:-v

obtain

multipll-ing

the

factor

is sct in

tlic frccllrency

voltagc

ancl
of dial illumination
minutes

warm

factor

oscillatorfrequencyc

indicated

the

of superpaseC

bI

position

}"3

wave , lvhilc-

position

OUTPUT

The

betrry-ecn

thc output impedancc

position

'

The

of distortion in

The lorver

output

of the

TER\4INALS

unbalanced

the cathode of the

of

the output

load

resistance

value

without thc increase

the

base

RANGIT

output is

or.rtput

of

resistancb

frcquency

FREQUtrNCY

and

ol-.,tained from

cathocie follor,ver

valics

control

higher

r,vaveformo

nearly frorn

than

of

is

constant

the potcntiomctcr

zr:ro

beirrg maximum

,

ke is

1O

may

be uscd

distortion"

.=

(

linc frequency

controls

ground

and

to 3 kQ

near its

desirecl to

the

at

lorner voltage

at any

)

settingo

connectecl
'Ihc

.

according

center

avoicl the increase

I'alue

to ilre

positiol

of the

of

I

-6-

r+:,.

OPERATING

4O

CHANGtr

e:

r

4.1
The
the

and

IN

OUTPUT

example of

frequency

the

output voltage is slioun

in Fig"

1

,

CAI*ISED

chanp

of

oscill:rtion-

ir'

,

CONSIDERATION

ElY

LINE]

VOLTAGE

VARIATION

f:taooHz

+4

-4

-6

2

Ll

o

t

rq

2

()

as

-a

FREQUENCY

4"2

.

Frequency

RESPONStr

response

Frequency
Output Voltage

of

sine

and

square

warre

L.NE

Fig" 1

output

YOLTA&E

are

(o/o)

l-

show'n in Figo

2.

4"3

a

t
k

:

l*

s

tr

F

o

SQUARE

Square
clipper

too

FREQ

WAVE

wave

in

this instrument is

circuito The faster

3fi

(Hz)

Fig'

Load

resistance

sha.ped from

rise time

!t

is

lOkQ

obtained

oO

70pF
TOpF

sine

wave through

nearly

ehuhted

shunted

t

the

propbrtional

to frequencyo

However, the

quality

because of the upper frequency

limit

of

the waveform

of

the circuitso

I

I

'

becomes

poor

I

\iAINTT.\AN('I].

.'"

*7*

RtrMO\,'AI-,

5.1

instrumcnt

The

in

but

pcrl

,

thc

t1-pical

f)C voltage

O],' CA:;tr

To

removc

front

instrumonto

c1 uring a bove

pancl slrorvn in

tjrc ca,sc, r:'emove

$,-as thorouglill

thc casc

It is

proce-.clul'e,

of

Fig,

lrecommcnclecl to

tcsted

dcfocl,

r.,,rittr:n in thc

3,

refor to tirc

fivc:

scr()ws on tlic top elnd l-rottom

and

sliclc

pu11

cre\\

insp<,'cted

ancl

follouing

cirer.rit cliagrarn"

case

pou'cr

to

tl-re

thc,.

off tlrc

bcforc

cablc

[eing

dc:scr:i1;tions

rcar arrtl

fr:om

)CTCW

ship-

and

of

fho

tlier

off

the linc

Top vicw Bottom view

2

RtrPI,ACEN4ENT Otr TI{ERMIS'I'OR

5.
Tho-rmistor

square

I'RtrQUtrN(-)Y

3

5

"

Tire

in thc

The instrumcnt

indicated

point
''\,hen

resistors

instr:umcut

ncar: high

the

panel

of

on

instrumorrt is

this

thc re'ar of thc

CAI,IBRATION

turring ca.pacltor of the frequc-.ncy

and

are

uill oscillate'or.cr

thc frequency

on

end of

frequencll' sta.ndard

I'ig"

sck:ctcd

dial

the

dial"

3

easily

czrsc,

accor:<ling

all rangcs

if

the

Thc

follorving

2OOOHz for

of

rc;rlaced by

to thc splecified

properly

calibration os made

procedur:e

instance

removing

cletcrmining netrnork

at tirc

is

availablc,

tl.c srnall

rating,

frc-'c1ucnc1-

onl-v* one

at

is

recommcnded

I

(r)

cHECK

Check the dial

mi::ror when

FoR Low

nee<ile

!

turning

DIAL

oF

is

capacitor

exactly

is

on

in

tr

thc

f'of

O

position

the even

of maximum

scale beneath

capacitancee

-B-

the

(2)

cAPAcITY
Set the turning

RANGE

resistor
ncarly
torvard
Adjust

(t)

cALIBRATIoN AT

Adjust

srvitch

of about

the

high encl

trimmers

trimmers
illator frequency
This

adjustment
variable
when

trimmers are adjusted

BALAN\IE

on " x1O

same

resistor

ot- BRIDGE

capacitor

in the ma:<imum

I'

Replace

o

1Ok!.:r and adjust

in the levcl rvith

thc oscillator

and

Ctl

CL2 to

,

keep the output

2oooHz

Ct2 in

Ct1

,

2OOOHz on

of

may be done

the stable

for

approximately

.r'ith

in

capacitance

thermistor

thc

its value

to

thcrmistor.

output

Ievel will

same

the dial scale

thermistor

output voltage"

relatively

muclr

position

the var'.able

with

gef

oscillator

the

Turn frequency

fluctug.te'

level

nearly

quantity

tr200'l

connectf:d

In.this

quantity

instead

caser horvever,

because

ancl

output

dial

constant"

get

to

the osc-

of the

bI

the

slow1y

a.large

error

Check
is still

lorving

(")

In

Wien

value,

ttre

in -frequencyr,

frequency error

the

found after

procedure

range

the

Bridge.

besides

resistor
Check the resistor
of

resistance

adjustment

every

on

abovc

maY

acljustment

adoPted"

be

of x1, resistancc

rcsistor

Sueh a

the

may

high

deterioration

become

and

unnegligible

the associated

of necessarye

in step

point
or

value

(2)

in

every

further accuracy

2OM?

of

shows

of the

insulation resistance

after

circuit' Adjust

should

be repeated'

range and a

is

adopted

generally

period

long

large

is desired,

as a branch.of

lirger

a

of bperation

effective

the

error
the

in

drift
parallel

fol*

I

its

to

o

value

t/

-9 -

(b)

lc/

The oscillation
tr20O$

necting

If

rrveen

rotor associated

in thc rangc of

high

thc

more

both

pi:ecise

end

resistor

frequency

xlOO

or small

calibration

thc rangc,

of

u.ith each dial

isoften

ancl x-l

slightty

ko Then,

capacitor

is dcsircd on each

the plate

bcncl

point.

lower than dial

frequency by

adjust

paral1c1

segments

the

to R'l

point

of

indication

of

con-

"

the

on

turning capacitor

dial bct-

Od

UC

'

{a:-.

r,-+:

.1,..,

1d,'1

d

r"Bl

?

'o

!c

a

r1

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