Kenwood FG-272 User manual

©PRINTED INJ.N
FUNCTION GENERATOR
FG-272
INSTRUCTION MANUAL
KENWOOD CORPORATION
KENWOOD

TABLE OFCONTENTS
INTRODUCTION3
FEATURES 3
PRECAUTIONS 4
SPECIFICATIONS 5
OPERATOR'S CONTROLSANDINSTRUCTIONS- 8
FrontPanel• 8
Rear Panel13
MAINTENANCE••••• 14
A productof
KENWOOD CORPORATION
17-5,2-chome,Shibuya,Shibuya-ku,Tokyo150,Japan
2

INTRODUCTION
TheMODELFG-272Sweep/FunctionGeneratorprovides
functionsofa functiongenerator,pulsegenerator,and
sweeposcillator.
FEATURES
1. Wide-banddesign: sevenrangescover full oscillation
frequency from 0.2Hzto2 MHz
2. Selectable output ofsinewaves,squarewaves,and
triangl waves through one-touchoperation.
3.TTLsquarewave output connectorfacilitatesusing
TTL-level output squarewavesasthesignalsource
forexperimentofa digital circuit.
4.ThesymmetryFunctionvariessymmetryofsaw-tooth
wavesandpulsewaves.
Itcaninvertthewavepolarity.
5.Applyingvoltage from 0 to+ 10VtotheVCFIN
connector implem ntsexternalsweepaswellas output
frequencycontrol.
6.Thelinearsweepfunctionprovidessweepfrequency
controluptomax.100: 1,Sweepfrequencyisvariable
from 0.5Hz(2seconds)to50Hz(20milliseconds).
Sweepcontrolisimplementedbyapplyingsweepsignal
totheVCFconnector from anexternaldevice.
7.OCvoltage(0to± 10V)canbeoverlaidupon output
waveform.
8.CombineduseoftheATT-20dBpushbuttonandthe
continuous attenuator providesmaximum attenuation
over40dB.
9.A smalland light-weight case with convenientcarrying
handle,whichalso serves asa tilting stand.
3

PRECAUTIONS
1. DonotusetheFG-272FunctionGeneratorunder3.DonotrepeatswitchingonandofftheGenerator,
thefollowingconditions:
- Places exposedtothedirectsunlight4,Followtheinstructionsinsection" MAINTENANCE
-Veryhotandhumidroomsifthesupplyvoltageistobechanged.
-Rooms with excessive mechanicalvibrations
-Neardeviceswhichirradiatestrongmagnetic
forces orpulsevoltage
2. TheFG-272operatesimmediatelyafterturningon
power.
For accuratemeasurement,however,waituntilit
warmsupsufficientlyafterpressingthePOWER
switch.
4

SPECIFICATIONS
<FREQUENCY CHARACTERISTICS >
GENERAL
OutputWaveformSinewave,squarewave,
trianglwave,pulsewave,
TTL-level squarewave,&
rampwave
Oscillation FrequencyRange•••0.2Hzto2 MHz
7ranges (1/10/100/1 k/10k
/100k/1M)
Frequency Accuracy± 5%of full scale
External FrequencyControl(VCF)
InputVoltage• 0 to+10; frequency
increases with positive
voltage
Frequency VariableRange•••100: 1 ormore
DC Offset••••••••••± 10V (opencircuit)
±5V (into 500)
continuous variable
Polarity• • • Invertedornon-inverted
SINE WAVE
DistortionRatio1%or less (10Hzto100kHz)
OutputFrequency Response ••• Within ± 1.0dBupto100
kHz (into 10Oatmax.
outputlevel)
Output• Variable
SQUARE WAVE
Symmetry••••••••±3%or less (at100Hz)
Rise/Fall Time100nsor less (atmax.
outputlevel)
OutputVariable
TRIANGL WAVE
Linearity1%or less (at100Hz)
OutputVariable
5

TTL OUTPUT
Rise/Fall Time25nsor less
OutputTTLlevel
<SWEEP CHARACTERISTICS >
InternalSweepLinear
Sweep Frequency• • • • • 0.5Hz(2sec)to50Hz(20
msec), continuousVariable
Sweep Width 1 : 1 to100: 1,peak-to-
peakvariableandcontinuous
variable
External sweep• BymeansofVCFinput
(Input impedance: 13kO)
<OUTPUT CHARACTERISTICS>
OutputVoltage• 20Vppormore(opencircuit)
10Vppormore (into 50O )
Attenuator•••••••• -20dBstep,andcontinuous
variable
Impedance50O±10%
< POWER SUPPLY >
InputVoltage 100/120/220/240 VAC± 10%
(Max.250VAC)
Frequency ••••••••• 50/60 Hz
Power Consumption• • • • Approx.20VA
<ENVIRONMENTALCONDITIONS>
Storage Temperature• • • -20to60°C,70%or less
OperatingTemperature• • 0 to40°C,80%or less
With Specifications• • • • 23±5°C,70%or less
6

<SIZE & WEIGHT>
Dimensions (WHO)• 240x 64x 190mm
Weight1.8kg
<ACCESSORIES >
Instruction Manual•••••••1
AC cable••••••••••••1
Fuse (0.3AT)1
(0.2A)1
7

OPERATOR'S CONTROLSANDINSTRUCTIONS
FRONTPANEL
Fig. 1
8

®POWERPushbutton
Pressing thispushbuttonturnsonpower.LEDlights
uptoindicatepowerison*
(2) RANGE(Hz)SelectorSwitchAssembly
Selects thefollowingsevenrangesofoscillation
frequency:
XI:
0.2Hz to
2 Hz
X10:
2 Hz to 20Hz
X100: 20Hz to 200Hz
X1k: 0.2kHz to
2 kHz
X10k:
2 kHz to 20kHz
X100k: 20kHz to 200kHz
X 1 M : 0.2MHzto
2 MHz
(3)FUNCTIONSelectorSwitchAssembly
Selects output waveformoutofsinewave(^V),
trianglwave(/\,), andsquarewave(H—i)-
0ATT-20dBPushbutton
pressing thispushbuttonattenuatesinputsignalby
20dB.
9

(DINVERTPushbutton-
Depressing (buttonengaged)invertspolarity.Another press (buttonreleased)recoverstheformerpolarity.
Fig. 2 illustrateseffectsoftheINVERTpushbuttonwithrespecttoDUTYcontrolknobsetting.
Fig. 2 EffectofINVERTPushbuttonwithrespectto
DUTY ControlKnobSetting
^\^^F>olarity Normal Inverted Normal Inverted
Waveforrr?\^/7
Counterclockwise
Rotation
Counterclockwise
Rotation
Clockwise
Rotation
Clockwise
Rotation
Square Wave
TrianglWave
Sine Wave
TTL Wave
10

©MAIN/PULSEOUTPUT Jack
MAIN : Outputssinewave,trianglwave,orsquare
waveselected with theFUNCTTONswitch
assembly.
PULSE : Outputspulsewave,regardlessof
FUNCTIONswitchsetting.
©AMPLITUDEControl
Rotatingthisknobvariesamplitudeofoutput
waveform.
(8)DC OFFSET Control
PullingthisknobadmixesDCvoltage with output
signal.
Clockwise rotationadmixespositivevoltage.
Counterclockwise rotationadmixesnegativevoltage.
Fig. 3 illustratesseveraltypesofwaveform with the
DCOFFSET knobpulledand50-ohmloadconnected.
ZeroDCoffsetatmax.signallevel
Offset limit fornon-clippingsignal
Excessive offset
Fig.3 ApplicationExampleofDCOffset
11
Positive DCoffset NegativeDCoffset
Positive DCoffset NegativeDCoffset

(9)DUTY/PULLTOWARS(SymmetryAdjustment)Control
Controls symmetryofoutputsignal.
Pullingthisknob,andclockwiserotationvariesthe
dutyratio from 1:1to5:1.
This adjustmentmakespulsewaveofsquarewave,
rampwaveorsaw- tooth waveoftrianglewave,
andasymmetricsinewaveofsinewave.
Note : Note that controllingthisknobchanges
frequency.
© SWEEP RATE Control
Controls sweeprate(sweepfrequency)oftheinternal
sweep oscillator.
© SWEEP WIDTH Control
Rotatingtheknobcontrolssweepwidth.
© FREQUENCY ControlDial
Variablepotentiometervariesfrequencywithinthe
rangeselected with theRANGEselectorswitch
assembly @.Thedialisscaled from 0.2to2.0.
© SWEEP SelectorPushbutton
Depressing (button engaged) selects internalsweep.
Another press (button released) selects external
sweep.
12

REAR PANEL
©VCFInput Jack
By applyingvoltagetothisjackinthestatewhere
the SWEEP selectorpushbutton© isanother press
(button released),frequencyofoutputsignalcan
bevaried.
Applicationofvoltage from 0 to10Vvaries
frequencyuptomax.100: 1.
©PowerConnector
Connector forsupplyingACpower.
Use thededicatedpowercord.
© Fuse Holder
Fuse holderforACpowersupply.
13
Fig. 4

MAINTENANCE
1. Fuse Replacement
Ifthefusehasblownout,findoutandeliminatethe cause.
Then, replaceitwitha newfuse.Usea 0.3A slow-blowfuseforsupplyvoltageof100to120V,ora 0.2A fuse
forsupplyvoltageof220to240V. Fuse holderisprovidedontherearpaneloftheunit.
2. ChangingSupplyVoltage
WARNING: Priortoopeningthe case, besuretodisconnectthepowercordfromthesocket.
2-1HowtoRemove Case
To openthe case, turntheunitupsidedown,andremovefour screws fromthe case baseplate.(SeeFig.5.)Then,
lift thebaseplatetodetachit.
2-2HowtoChangeSupplyVoltage
The FG-272isavailableforsupplyvoltageof100,120,220,and240VAC,50/60Hz.
To changethesupplyvoltage,removethe case (inaccordancewithitem2-1above),andreconnectthevoltage
selector plugontheprintedcircuitboardintheunittoa desiredvoltagepositiononthevoltageterminalboard.
(See Fig.6.)
14

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