Kenwood FG-273 User manual

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FUNCTIONGENERATOR
FG-273
INSTRUCTION MANUAL
KENWOODCORPORATION
KENWOOD

TABLE OFCONTENTS
INTRODUCTION 3
FEATURES 3
PRECAUTIONS • 4
SPECIFICATIONS 5
OPERATOR'S CONTROLSANDINSTRUTONS•••8
FrontPanel8
Rear Panel13
MAINTENANCE• 14
Aproductof
KENWOOD CORPORATION
17-5,2-chome,Shibuya,Shibuya-ku,Tokyo150,Japan
2

INTRODUCTION
TheMODELFG-273Sweep/FunctionGenerator
providesofa functiongenerator,pulsegenerator,Sweep
oscillator, andfrequencycounter.
FEATURES •
1. Wide-banddesign: sevenrangescover full oscillation
frequency from 0.02Hzto2 MHz
2. Selectableoutputofsinewaves,squarewaves,and
triangularwavesthroughone-touchoperation.
3. TTL/CMOSsquarewaveoutputconnectorfacilitates
using TTL-levelandCMOS-leveloutputsquarewaves
as thesignalsourceforexperimentofa digitalcircuit.
4.ThesymmetryFunctionvariessymmetryofsaw-tooth
waves andpulsewaves.
Itcaninvertthewavepolarity.
5.Equipped with a 6-segmentLEDoscillationfrequency
display anda countercoveringtherange from 5 Hzto
10MHz.
6.Applyingvoltage from 0 to+10V totheVCFIN
connector implementsexternalsweepaswellasoutput
frequencycontrol.
7.Thelogsweepandlinearsweepfunctionprovides
sweep frequencycontroluptomax.1000: 1.Sweep
frequencyisvariable from 0.5Hz(2 seconds) to50
Hz(20milliseconds).
Sweep controlisimplementedbyapplyingsweepsignal
totheVCFconnector from anexternaldevice.
3. DCvoltage(0to± 10V)canbeoverlaiduponoutput
waveform.
9.Combineduseofthe-20dBand-40dBATTENUA-
TOR pushbuttonsandthecontinuousattenuator
providesmaximumattenuationover60dB.
10.A smallandlight-weight case with convenient
carryinghandle,whichalso serves asa tilting stand.
3

PRECAUTIONS
1. DonotusetheFG-273FunctionGeneratorunderthe
following conditions:
- Places exposedtothedirectsunlight
-Veryhotandhumidrooms
-Rooms with excessive mechanicalvibrations
-Neardeviceswhichirradiatestrongmagnetic
forces orpulsevoltage
3. DonotrepeatswitchingonandofftheGenerator.
4.Followtheinstructionsinsection" MAINTENANCE",
•ifthesupplyvoltageistobechanged.
2. TheFG-273operatesimmediatelyafterturningon
power.
For accuratemeasurement,however,waituntilit
warmsupsufficientlyafterpressingthePOWER
switch.
4

SPECIFICATIONS
< FREQUENCY CHARACTERISTICS >
GENERAL
OutputWaveform• • • • Sine wave,squarewave,
trianglwave,pulsewave,TTL
/CMOS-level squarewave,&
rampwave
Oscillation FrequencyRange• • 0.02Hzto2 MHz
7ranges(1/10/100/1k/10k/
100k/1M)
Frequency Accuracy(1)• • Max.± 1/4digits(Digital
display tooutputfrequency)
Frequency Accuracy(2)• • ± 5%offull scale (0.2Hto
2MHz) ( Frequencydialto
outputfrequency)
External FrequencyControl(VCF)
InputVoltage0 to+10; frequency
increases withpositive
voltage,max.± 20V (DC+
AC peak)
Frequency VariableRange• • • 1000: 1 ormore
SymmetryVariableRange• • • • 1 : 1 to40: 1 ormore
DC Offset• •••••± 10V(opencircuit)
±5V (into50O)
continuous variable
Polarity• Invertedornon-inverted
SINE WAVE
Distortion1%or less (10Hzto100kHz)
OutputFrequency Response • • • Within± 1.0dBupto
100kHz(into50O , atmax.
output)
Output• • Variable
SQUARE WAVE
Symmetry± 3%or less (at100Hz)
Rise/Fall Time• • • • 100nsor less (atmax.output
level)
Output••••••••Variable
TRIANGL WAVE
Linearity1%or less (at100Hz)
Output••Variable
5

TTL OUTPUT
Rise/Fall Time25nsor less
Output TTLlevel
CMOS OUTPUT
Rise/Fall Time60nsor less
Output• Continuousvariable from +5
Vto+15V (High)
<SWEEP CHARACTERISTICS >
InternalSweepLinearorlogarithmic
Sweep Frequency• • • • • 0.5Hz(2sec)to50Hz(20
msec),continuousvariable
Sweep width • • • • • • • 1 : 1 to1000: 1,peak-peak
variableandcontinuous
variable
External sweepBymeansofVCFinput
<FREQUENCY COUNTER CHARACTERISTICS >
Frequency Range• • • 5 Hzto10MHz(1Osec,1 sec,
0.1 sec, & 0.01sec)
Accuracy • ••••••Referenceclockaccuracy± 1 count
Stability• ± 2x10"5or less (0to40°C)
InputSensitivity• • • • 30mVr.m.s.(5Hzto10MHz)
Max.InputVoltage• • 150Vr.m.s(at1kHz)
InputImpedance• • • • OdB: Approx,500k£l
-20dB: Approx,1MX1
<OUTPUT CHARACTERISTICS >
OutputVoltage• • • • 20Vppormore(opencircuit)
10Vppormore (into 5012)
Attenuator• • • • • • -20dB/-40dBstep,orcontinuous
variable
Impedance• 50O±10%
6

<POWER SUPPLY >
Input Voltage• • • • * 100/120/220/240 VAC± 10%
(Max.250VAC)
Frequency • • 50/60 Hz
PowerConsumption• • Approx.20VA
<ENVIRONMENTALCONDITIONS>
StorageTemperature• • -20to60°C,70%or less.
OperatingTemperature• 0 to40°C,80%or less
With Specifications• • 23± 5 °C,70%or less
<SIZE& WEIGHT>
Dimensions(WHD)»• 240x 64x 190mm
Weight 1.8kg
<ACCESSORIES >
Instruction Manual • • 1
AC cable• • 1
Fuse (0.3AT)1
(0.2A) 1
7

OPERATOR'S CONTROLSANDINSTRUCTIONS
Fig. 1
8
FRONTPANEL

®POWERPushbutton
Pressing thispushbuttonturnsonpower.Counter
display fightsuptoindicatepowerison.
©CounterDisplay
Digitallydisplaysinternaloscillationfrequencyor
frequencyofexternalinputsignal.
© OVER LED
Lights upwhenreadingonthecounterdisplay
overflows. .
0 GATE LED
Flashes whenthegateisoperating.
©,©Hz/kHzLED
Indicatetheunitoffrequency,HzorkHz,aswellas
thedecimalpointwhen10s,1s,0.1s,or0.01s is
selected with thegate time selectorswitchassembly®.
© FREQUENCY Control
Variablepotentiometervariesfrequencywithinthe
rangeselected with theFreqoencyRANGEselector
switch assembly®.Thedialis scaled from 0.2to2.0.
© SWEEP WIDTH / PULL ONControl
Pullingtheknob selects internalsweep.Rotatingit
controls sweepwidth.
Pushing theknob selects externalsweep,whichis
implementedwhenexternalsweepvoltageisapplied
totheVCFinputconnector,
© SWEEP RATE / PULL LOGControl
Controls sweeprate(sweepfrequency)oftheinternal
sweep oscillator.
Pullingtheknob selects logarithmicsweep.
9

© DUTY/PULL INV(SymmetryAdjustment/PolaritySelector)Knob
Controls symmetryofoutput signal.
Clockwise rotationvariesthedutyratiofrom1:1to40:1.
This adjustmentmakespulsewaveofsquare wave, rampwaveorsaw-toothwaveoftriangle wave,
and asymmetric sine waveof sine wave.
Pulling thisknobinvertsthephasepolarity.
Note : Note thatcontrollingthisknobchangesfrequency.
Normal Inverted Normal Inverted
Waveform^^^o/?
Counterclockwise
Rotation' ;
Counterclockwise
;Rotation
Clockwise
Rotation
Clockwise
Rotation
Square Wave
TriangiWave
Sine Wave
TTL Wave
Fig. 2 EffectofINVERTPushbutton with respectto
DUTY ControlKnobSetting
10

@ OFFSET/PULL ADJControl
Pulling thisknobadmixesDCvoltage with output signal.
Clockwise rotationadmixespositivevoltage.
Counterclockwise rotationadmixesnegativevoltage-
Fig. 3 iillustratesseveraltypesofwaveform with the OFFSET knobpulledand50-ohmloadconnected.
ZeroDCoffsetatmax.signallevel
Offset limit fornon-clippingsignal
Positive DCoffset NegativeDCoffset
Excessive offset
Positive DCoffset NegativeDCoffset
Fig.3 ApplicationExampleofDCOffset
11

©PUSHTTLKnob(CMOSLevel Control Knob)
PullingthecontrolvariesthelevelofCMOSsquare
waves from 5Vpp to15Vppcontinuously.
Rotatingtheknob,ifitisdepressed, causes no
variationinthelevelofTTLsquarewaves,
@ AMPLITUDEControl
Rotatingthis control varies amplitude of output
waveform.
@ FrequencyRange/GateTimeSelectorSwitchAssembly
Selects the following sevenrangesofoscillation
frequencyor four rangesof gate time :
X1:
10s
0.2Hzto2 Hz
X10: A 2Hzto20Hz
X100: •1s 20Hzto200Hz
X1k: J 0.2kHzto2 kHz
X10k: 0.1s 2 kHzto20kHz
X100k :i 0.01s 20kHzto200kHz
X 1 M : I
0.01s 0.2MHzto2 MHz
(§)COUNTEREXTSelectorPushbutton
Pressing thepushbutton (button engaged)selects
external input frequency.Anotherpress (button
released)selectsinternaloscillationfrequency.
@ COUNTER-20dBPushbutton-
Pressing thepushbuttonattenuatescounter input
signalby20'dB.
@,@ATTENUATORPushbuttons
Pressing thesepushbuttonsattenuates output signal
by20dBand40dBrespectively.
@ FUNCTIONSelectorSwitchAssembly
Selects output waveformoutofsinewave(),
triangl wave(/\/),andsquarewave(H-i)•
@ TTL/CM OS Output Jack
OutputsTTL-levelorCMOSsquarewaves.
®EXTCOUNTER Input Jack
Input jackformeasuringfrequencyofexternalsignal.
®VCF Input Jack
By applyingvoltagetothisjackinthestatewhere
the WIDTH pushbutton(8)isdepressed (button engaged),
frequencyof output signalcanbevaried.
Applicationofvoltage from 0 to10Vvaries
frequencyuptomax,1000:1.
(§> OUTPUT Jack
Outputssinewave, triangl wave,orsquarewave
selected with theFUNCTIONselectorswitchassembly
@ .
12

REAR PANEL
@ PowerConnector
Connector forsupplyingACpower.
Use thededicatedpowercord.
© Fuse Holder
Fuse holderforACpowersupply.
Fig. 4
13

MAINTENANCE
1. Fuse Replacement
Ifthefusehasblownout,findoutandeliminatethe cause.
Then, replaceitwitha new fuse.Usea 0.3A slow-blowfuseforsupplyvoltageof100to120V , ora 0.2A
fuse forsupplyvoltageof220to240V. Fuse holderisprovidedontherearpaneloftheunit.
2. ChangingSupplyVoltage.
WARNING: Prior'to"opening'the case, besuretodisconnectthepowercord from the.socket,
2-1HowtoRemove Case
To openthe case, turntheunitupsidedown,andremovefour screws fromthe case baseplate.(SeeFig.5.)Then,
lift thebaseplatetodetachit.
2-2HowtoChangeSupplyVoltage
The FG-273isavailableforsupplyvoltageof100,120,220,and240VAC,50/60Hz.
To changethesupplyvoltage,removethe case (inaccordancewithitem2-1above),andreconnectthevoltage
selector plugontheprintedcircuitboardintheunittoa desiredvoltagepositiononthevoltageterminalboard.
(See Fig.6.)
14

Screws (4)
Power transformer
Frontside
Fig. 6 Internal selection of Supply Voltage
Rubbershoe
Case
Fig. 5 Disassembly and Assembly of Case
Fuse side
Voltage selector plug
-Voltageterminalboard
15
Rearside