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-3-


1U SPECIFICATIONS




Type - Wien Bridge RC Oscillator

Power Rcqui::ement 24C -y, 50,/6OH:- Approx, 3ovA

Dimer;sions J O O ( W ) 1 ' 7 0 ( U ): ; 1 5 3 ( D ) m m
r
( Ma r" ) toOiw)x 1s0( u)x 110( D)
mm

Worght Approx. 5kg
Vacuum Tube 5AV6 1
6AR5 2
1zAT 7 1
6){4 4
I


:a'
:1
Accessones Operation I\4anual
Test Data 1

Frcquency Rangc xl 18 - 2OOHz
x 1O 1 B O- 2 O O O H z
x 1OO 1 800 - 20000Hi
x 1k 18 - 200kHz

Calibration Accuracv From 18tlz to loOkl{z ! (2% + 1 t{z )
,
f'requency regulation For AC -?.40_V, t 5%t Less than * 1%

Frequency response Sine : Less than j O,5 dB ( reference : l kHz )

Square : Less than i 0,5 dB
( referencc : 1 kHz ) up to 2Okllz

Maximum Output Sine : more ttran 5 V rms
Squa.re ; more than 10 Vp-p
Complex : morc than 1OVp-p
' D i s t o r t i o n o - fS i n c W a v c l , c s s t h a n 1f , a t 1 k l 1 z

, /
. Sag or Overshoot of Sqare Wave
7 Lcss
Lo=" than 1 clB

Complex Wave Basc line frequency
Superposed Wave lBHz - ?OOkHz
Amplitude Ratio Approx, {;1

Output Impedance Less tiran 3 kil
-A -




2o FLTNCTION OI"CTONTROLs AND TERIutNALb




oRc,27A
OSCILLATOR




Por,r'cr srvitch
I




OutJrut tcrminals

/\
Frccluencl- control -2 u'aveform
I"requenc, Auo Output L'eve.I




R c m o v c t h i s p a n e l for replacement
of thc:rmi stcr
r
q




-3" OPERATION


.}"1
INI'IIAL PROCIIDURII


Conrrect tire porver ca=irlcto a po.,\er line of thb snecifietl voltagc ancl

frcquettc','" Turn the pol,er sn'.tch to ON., '1'hc lamp of dial illumination

u'ill light and tirc irrstrument will opcratc aftcr a fe:w minutes warm

-up" It will ber w-itliin specifications after 3O minutcs.


3.2 I RIiQUIINCI

Se:t tlto RANGE and li'RFjQUIINCY cor.rtrols for thc clcsired frequcrrcl,-"

Thc frequencv di:rl scal"e must be multpliccl i:-v thc multipll-ing factor

indicated b5' the RANGtr sn,itch setting to obtain the oscillatorfrequencyc

llxAtvIPLE: 1oo ( on clial scale ) x 1o (multiplS,ing factor indicated bI

RANGIT :IWITCH settilir ) : t tUz

When the rot:rr-v s'.vitch r'^,irichsclccts WAVEFORIyi is sct in the position

of CON4PLEX, thc r.a.luc ol.,taincd above is tlic frccllrency of superpaseC

wave , lvhilc- the base frcquency is constant ( .= linc frequency ) at any

position of the RANGIT and FREQUtrNCY controls settingo


}"3 OUTPUT TER\4INALS

The unbalanced output is ol-.,tained from the potcntiomctcr connectecl

betrry-ecn the cathode of the cathocie follor,ver 'Ihc
and ground . I'alue of

thc output impedancc valics nearly frorn zr:ro to 3 kQ according to ilre

position of the output control , beirrg maximum near its center positiol
'
The load resistance higher than 1O ke is desirecl to avoicl the increase

of distortion in or.rtput r,vaveformo

The lorver value of resistancb may be uscd at the lorner voltage of the

output without thc increase of distortion"




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r+:,.




-6-

4O OPERATING CONSIDERATION


e: 4.1 CHANGtr IN OUTPUT CAI*ISED ElY LINE] VOLTAGE VARIATION
r
The example of chanp ir' ,
+4
the frequency of oscill:rtion- 2
f:taooHz Ll


and the output voltage is slioun o
t
rq
2
()
in Fig" 1,
-4 as
-6

-a
Frequency L.NE YOLTA&E (o/o)

Output Voltage
Fig" 1 l-

4"2 FREQUENCY RESPONStr

. Frequency r e s p o n s e o f sine and square warre output are show'n in Figo 2 .

Load resistance oO 70pF ehuhted
!t
lOkQ TOpF shunted




a
t
k
:
l*
s
tr
F
o

too 3fi

FREQ (Hz)

Fig'
t
4"3 SQUARE WAVE

Square wave in this instrument is sha.ped from sine wave through the

clipper circuito The faster rise time is obtained nearly propbrtional

to frequencyo However, the quality of the waveform becomes poor

because of the upper frequency limit of the circuitso
I

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\iAINTT.\AN('I].
.'"


The instrumcnt $,-as thorouglill tcsted ancl insp<,'cted bcforc [eing ship-

pcrl , but in thc casc of dcfocl, refor to tirc follouing dc:scr:i1;tions and

thc t1-pical f)C voltage r.,,rittr:n in thc cirer.rit cliagrarn"

O],' CA:;tr
5.1 RtrMO\,'AI-,

To removc tjrc ca,sc, r:'emove fivc: scr()ws on tlic top elnd l-rottom of fho

front pancl slrorvn in Fig, 3 , a n d sliclc thc,.case to tl-re rcar arrtl off tlier

instrumonto It is lrecommcnclecl to pu11 off tlrc pou'cr cablc fr:om the linc

c1 ring
u above proce-.clul'e,




cre\\


)CTCW




Top vicw Bottom view


I'ig" 3


5. 2 RtrPI,ACEN4ENT Otr TI{ERMIS'I'OR

Tho-rmistor of this instrumorrt is easily rc;rlaced by removing tl.c srnall

square panel on thc re'ar of thc czrsc,

5 3 I'RtrQUtrN(-)YCAI,IBRATION
"
I
Tire resistors and turring ca.pacltor of the frequc-.ncy cletcrmining netrnork

in thc instr:umcut are sck:ctcd accor:
The instrumcnt uill oscillate'or.cr all rangcs properly at tirc frc-'c1ucnc1-

indicated on thc frequency dial if the calibration o s m a d e a t o n l - v *o n e

point ncar: high end of the dial" Thc follorving procedur:e is recommcnded

''\,hen the frequencll' sta.ndard of 2OOOHz for instance is availablc,
-B-



( r ) c H E C K F o R L o w o F DIAL

Check the dial nee !
mi::ror when turning capacitor is in thc position of maximum capacitancee

(2) cAPAcITY BALAN\IE ot- BRIDGE

Set the turning capacitor in the ma:
RANGE srvitch on " x1O I' o Replace thc thermistor with the var'.able

resistor and adjust its value to gef the oscillator
of about 1Ok!.:r output

ncarly the same in the levcl rvith thcrmistor. Turn frequency dial slow1y

torvard high encl and thc oscillator output Ievel will fluctug.te'

Adjust trimmers Ctl , CL2 to keep the output level nearly constant"

(t) cALIBRATIoN AT 2oooHz

Adjust trimmers Ct1 , Ct2 in approximately same quantity to get the osc-

illator frequency of 2OOOHzon the dial scale tr200'l

This adjustment may be done .r'ith thermistor connectf:d instead of the

variable resistor for the stable output voltage" In.this caser horvever,

when trimmers are adjusted in relatively muclr quantity because bI a.large

error in -frequencyr, adjustment in step (2) should be repeated'


Check the frequency error on every point in every range and a large error

is still found after abovc acljustment or further accuracy is desired, the fol*

lorving procedure maY be adoPted"

(") In the range of x1, resistancc value of 2OM? is adopted as a branch.of
I

Wien Bridge. Sueh a high rcsistor shows generally a lirger drift in its

value, besides the deterioration of the insulation resistance parallel to

ttre resistor may become unnegligible after long period of bperation o

Check the resistor and the associated circuit' Adjust the effective value

of resistance of necessarye
t/



-9 -



(b) The oscillation frequency isoften slightty lower than dial indication of

tr20O$ in thc rangc of xlOO ancl x-lko Then, adjust the frequency by con-

necting high resistor or small capacitor paral1c1 to R'l
"

lc/ If thc more pi:ecise calibration is dcsircd on each point on the dial bct-

rrveen both end of thc rangc, bcncl the plate segments of turning capacitor

rotor associated u.ith each dial point.
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