PiezoFilmLabAmplifier
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ChargeorVoltageModeOperation
BNCInputandOutput
0.01to1000mV/pCSensitivityRangeinChargeMode
1Mto1GInputResistance,-40to40dBGaininVoltage
Mode
Multi-Pole,Low-PassandHigh-PassFilteringwith-3dB
FrequenciesRangingfrom0.1Hzto100kHz
InternalBattery(2x9V)orexternal24VDCPower
SupplyOperation
ThePiezoFilmLabAmplifierisaversatilepreamplifierforusewithPiezoelectricsensors.Theelectricsignal
fromthepiezofilmisgeneratedwithintheelectrodesofacapacitor.Itisimportanttoarrangeaninputthatcontrolstherate
ofchargeleakageappropriatelyfortheapplication.Simplyconnectingapiezofilmelementtotheinputofanoscilloscopewill
usuallycreateahigh-passfilterthatremovesanylowfrequencycontentoftheoriginalpiezosignal,andthiscanleadto
disappointmentorincorrectevaluationofthematerial''struepotential.ThishasledMEAStodevelopanewlow-costPiezo
FilmLabAmp,specificallyaimedatdevelopersandengineersexploringthematerial.Bothfirst-timeusersandseasoned
professionalswillbenefitfromthewiderangeofsensitivityadjustmentineithervoltageorchargemodes,andthefunctionality
ofthehigh-andlow-passfilters.
FEATURES
?WideDynamicRange
?ChargeandVoltageModes
?Responseto0.1Hz
?ActiveHPandLPFilters
APPLICATIONS
?LowFrequencyDynamicStrain
?PyroelectricSignals
?Audio-bandandAcousticSignals
?MachineVibration
?PiezoCableandTrafficSensorInterface
performancespecifications
ELECTRICAL
SupplyVoltageInternal2x9VBatteryorExternal24VDC(usingthesupplied100-240VAC50/60Hz
powersupplyunit)
MaxInputVoltage30V
MaxLinearOutputSwing±4V(battery),±5V(ext)
VoltageMode:
InputResistorValues1M,10M,100M,1G?
Gain0to+40dBin10dBIncrementswith-40dBSwitch
Noise30mVrms(0.20Vpp)typ,1Hzto100kHz,1GInput,+40dB(loweronbatterypower)
ChargeNoise:
FeedbackCapacitorValues100pF,1nF,10nF,100nF
SensitivityRange0.01to1000mV/pC
Noise20mVrms(0.13Vpp)typ,1Hzto100kHz,100pF,+40dBGain(loweronbatterypower)
ENVIRONMENTAL
OperatingTemperature0to50°C
OperatingHumidity5to95%RHNon-Condensing
SurvivalTemperature-20°Cto+60°C,PowerOff
Linearity<1%
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Instructionsdescriptionofcontrols
ModeSelectorSwitch
Thesettingofthisswitchdetermineswhetherthe
amplifierisfunctioningin“chargemode”or“voltage
mode.”Inchargemode,theinputappearslikea
short-circuitsensorandallchargethatisgenerated
bythesensorglowsintotheinputandappearsona
feedbackcapacitorwithinanop-ampcircuit.In
“voltagemode,”theinputappearslikeanopencircuit
andnochargeflows.Thesettingsofthevariousinput
andfiltercontrolsthenmodifytheactualperformance
ineithersetting.
FeedbackCapacitanceSelector(chargemode)
Whentheamplifierisoperatinginchargemode,this
controlchangesthesensitivityoftheinitialamplifier
stage.Intypicaluse,itwillbesettothevalueclosest
tothesensorundertest.Selectingafeedback
capacitancelowerthanthatofthesensorwillcreate
furtherapparentgain,whileselectingahigher
feedbackcapacitancewillreduceoverallgain.A
quantityofchargeappliedtotheinputnumerically
equaltothefeedbackcapacitancevalue(for
example,100pCofcharge,with100pFsettingof
feedbackcapacitance)willgenerateonevoltfromthe
initialstage,beforefurthermodificationbythefilters
andgaincontrol.
InputImpedanceSelector(voltagemode)
Whentheamplifierisoperatinginvoltagemode,this
controlchangestheelectricalresistanceseenatthe
inputoftheamplifier.Foragivenvalueofsensor
capacitance(C),differentvaluesofinputresistance
(R)createdifferentlow-frequencyresponse
characteristics.ThesimpleRCfilternetworkformsa
high-passfilter,whichoperatesindependentlyfrom
thelowfrequencyselectorswitch.Theinfluenceof
thisimpedanceselectormustthereforebe
consideredseparatelyfromthelowfrequency
selector(seeAppendixB).
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descriptionofcontrols(continued)
InputAttenuatorSwitch(voltagemode)
Thisswitchallowstheinputsignaltobeattenuated
by40dB(linearfactorof100),whentheamplifieris
operatinginvoltagemode.Thiscanbeusefulin
caseswheretheopen-circuitvoltagebeing
monitoredisveryhigh,andwouldcausetheoutput
voltagetoclip.Thesettingofthisswitchdoesnot
affecttheinputimpedanceseenbythesensor.
LowFrequencySelector
Thefunctionofthiscontrolistoapplyamulti-pole
high-passfiltertothesignal.Frequenciesbelowthe
selectedlimitwillbeprogressivelyattenuated.In
chargemodeoperation,thesignalwillbe-3dB
down(orapproximately0.7X)attheselected
frequency.Involtagemode,theinfluenceoftheRC
filtermustalsobeconsidered(seeInput
ImpedanceSelector).Reducingthelow-frequency
contentofasignalmaybeusefulwhenthesignals
ofinterestarerelativelyhighinfrequencyandlow
inamplitude.
HighFrequencySelector
Thiscontrolappliesamulti-polelow-passfilterto
thesignal.Itcanbeusedinconjunctionwiththe
LowFrequencyselectortoformaband-passfilter,
wherenoiseoutsideaselectedbandoffrequency
canbestronglyattenuated.
GainSelector
Thepurposeofthiscontrolistoallowselectionofa
finalgaintobeappliedtotheoutputofthefilter
stages.Selecting"0dB"involtagemodemeans
thattheoverallgainoftheamplifieriszerodB
(linear1X),whentheInputAttenuatorisalsosetto
"0dB".Thegainisadjustablein10dBstepsupto
40dB(linear100X).
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Appendix
PowerIndicator
ThegreenpowerindicatorLEDlightswhenthepowerswitchisswitchedto"1"(ONposition),using
eithertheinternalbatteriesorwhentheexternal24Vpowersupplyisconnected.
BattLow
TheredlowbatteryLEDlightswhenthevoltageoftheinternalbatteriesfallsbelow8Vapprox.When
thebatterypowerisnolongersufficientforcorrectoperation,neither"Power"nor"BattLow"willbe
illuminatedwhenpowerswitchisswitchedto"1".
BatteryCompartments
Thebatterycompartmentsareaccessiblefromthe
rearpanel.Toopenacompartment,thebatterytray
shouldbeliftedupslightly,thenpulledoutwards.
Batteriescanbeleftintheamplifierwhileitisbeing
operatedonexternalpower.
ExternalPowerInput
Justbelowthebatterycompartmentsliestheinput
connectorfor24VDC(centerpin+ve).Useonlythe
powersupplyprovidedwiththeamplifier.
PowerSwitch
Thisswitchespower(frominternalbatteriesorfromexternal24VDCsupply)totheamplifieronoroff.
Toconservebatterylife,powershouldbeswitchedoffwhenunitisnotinuse.
InputBNC
Signalinput(foreithervoltagemodeorchargemodeoperation)shouldbeconnectedtotheInputBNC.
Inputvoltageshouldnotexceed30V,andthisvoltageshouldnotappearacrossasensorcapacitancein
excessof100nF.Theinputaddsapprox50pFshuntcapacitance,whichmustbeborneinmindwhen
calculatingRCfilterfrequenciesforlow-valuesensorcapacitanceinvoltagemode.
OutputBNC
Impedance50ohmsmax.Theoutputoftheamplifierisintendedtodrivetheinputofanoscilloscope,
signalanalyzer,ordataacquisitionsystem.
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Appendix
AppendixA:Filterresponseplots
UpperLimitingFrequencyControl
-60
-50
-40
-30
-20
-10
0
10
110100100010000100000
Frequency(Hz)
Ma
gn
itu
de
(d
B)100KHz
10kHz
1kHz
100Hz
10Hz
LowerLimitingFrequencyControl
-60
-50
-40
-30
-20
-10
0
10
0.010.1110100100010000
Frequency(Hz)
Ma
gn
itu
de
(d
B)0.1Hz
1Hz
10Hz
100Hz
1kHz
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Appendix
AppendixB:InfluenceofInputImpedanceselection
onlowfrequencyresponse(voltagemode)
Thetablebelowshowsthetheoretical-3dBfrequency(inHz)ofthehigh-passfilterthatis
formedwhenasensorofcapacitancelistedinfirstcolumnisconnectedtothespecified
inputimpedance.
1M10M100M1G
100p1592159161.6
220p723727.20.72
470p339343.40.34
1n159161.60.16
2.2n727.20.720.072
4.7n343.40.340.034
10n161.60.160.016
22n7.20.720.0720.0072
47n3.40.340.0340.0034
100n1.60.160.0160.0016
Note:theshadedcellshavea-3dBfrequencythatisbelowtherangeoftheLow
FrequencySelector,andinthiscase,theLowfrequencySelectorwilldeterminethe
performance.Inthecaseoftheunshadedcells,thelowfrequencylimitwillbedetermined
eitherbytheLowFrequencyselector,orbythedataabove,whicheveristhehigher.
北京赛斯维测控技术有限公司咨询热线：010-84775646www.sensorway.cn
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includedinpackage
1)PiezoFilmLabAmplifier:
2)PowerSupply:
Input:100-240VAC,50/60Hz,1.8A
Output:24VDC1A
Connector:IEC60320C14(inlet)
3)PowerSupplyCable/Plug
MUSTBEORDEREDSEPARATLY
Connector:IEC60320C13
RegionalVersionsAvailable:
1007232-1-PowerSupplyPlug,EU
1007232-2-PowerSupplyPlug,UK
1007232-3-PowerSupplyPlug,USA
1007232-4-PowerSupplyPlug,Japan
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includedinpackage
Theinformationinthissheethasbeencarefullyreviewedandisbelievedtobeaccurate;however,noresponsibilityisassumedforinaccuracies.Furthermore,thisinformationdoesnot
conveytothepurchaserofsuchdevicesanylicenseunderthepatentrightstothemanufacturer.MeasurementSpecialties,Inc.reservestherighttomakechangeswithoutfurthernotice
toanyproductherein.MeasurementSpecialties,Inc.makesnowarranty,representationorguaranteeregardingthesuitabilityofitsproductforanyparticularpurpose,nordoes
MeasurementSpecialties,Inc.assumeanyliabilityarisingoutoftheapplicationoruseofanyproductorcircuitandspecificallydisclaimsanyandallliability,includingwithoutlimitation
consequentialorincidentaldamages.Typicalparameterscananddovaryindifferentapplications.Alloperatingparametersmustbevalidatedforeachcustomerapplicationby
customer’stechnicalexperts.MeasurementSpecialties,Inc.doesnotconveyanylicenseunderitspatentrightsnortherightsofothers.
orderinginformation
NorthAmerica
MeasurementSpecialties,Inc.
1000LucasWay
Hampton,VA23666
SalesandCustomerService
Tel:+1-800-745-8008or
+1-757-766-1500
Fax:+1-757-766-4297
TechnicalSupport
Email:piezo@meas-spec.com
Europe
MEASDeutschlandGmbH
Hauert13
44227Dortmund
Germany
SalesandCustomerService
Tel:+49(0)231974021
TechnicalSupport
Tel:+49(0)6074862822
Email:piezoeurope@meas-spec.com
Asia
4)Accessories
(a)2x9VBatteries,Type1604A
(6LF22/6LR61/MN1604),Mercuryand
CadmiumFree
(b)PiezoSensor(modifiedSDT1-028K),p/n
1-1000288-1,1mShieldedCable,BNC
Connector
(c)BNC“Tee”adapter
(d)2xBNCCable,0.58mNominal,Bare
End
北京赛斯维测控技术有限公司
北京市朝阳区望京西路48号
金隅国际C座1002
电话：＋8601084775646
传真：＋8601058949029
邮箱：sales@sensorway.cn
http://www.sensorway.cn
北京赛斯维测控技术有限公司www.sensorway.cn咨询热线：010-84775646
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