Campbell-scientific CR3000 Micrologger Manual do Utilizador descarregar pdf (Página 79)

79



Section 6. CR3000 Specifications

1.1

CR3000specificationsarevalidfrom─25°to50°Cinnon‐condensingenvironmentsunlessotherwisespecified.Recalibrationisrecommendedeverytwoyears.Criticalspecificationsandsystem

configurationsshouldbeconfirmedwithaCampbellScientificapplicationsengineerbeforepurchase.

2.0

PROGRAMEXECUTIONRATE

2.1

10mstoonedayat10msincrements

3.0

ANALOGINPUTS(SE1–28,DIFF1–14)

3.0.1

Fourteendifferential(DIFF)or28single‐ended(SE)individually

configuredinputchannels.Channelexpansionprovidedby

optionalanalogmultiplexers.

3.1.0

RANGESandRESOLUTION:Withreferencetothefollowingtable,

basicresolution(BasicRes)istheresolutionofasingleA/D

(p.

449)conversion.ADIFFmeasurementwithinputreversalhas

better(finer)resolutionbytwicethanBasicRes.

3.1.1‐‐30



Range(mV)



DIFFRes,μV



(17bit)

BasicRes,μV

(16bit)

±5000

±1000

±200

±50

±20

83.33

16.67

3.33

0.83

0.33

167

33.3

6.67

1.67

0.67

Rangeoverheadof≈9%onallrangesguaranteesfull‐scale

voltagewillnotcauseover‐range.

ResolutionofDIFFmeasurementswithinputreversal.

3.2‐‐30

ANALOGINPUTACCURACY

:

±(0.04%ofreading+offset),0°to40°C

±(0.07%ofreading+offset),‐25°to50°C

±(0.09%ofreading+offset),‐40°to85°C(‐XTonly)

3.2.1

Accuracydoesnotincludesensorandmeasurementnoise.Offset

definitions:

Offset=1.5xBasicRes+1.0µV(forDIFFmeasurementw/input

reversal)

Offset=3xBasicRes+2.0µV(forDIFFmeasurementw/oinput

reversal)

Offset=3xBasicRes+5.0µV(forSEmeasurement)

3.3

ANALOGMEASUREMENTSPEED:

3.3.1‐‐30

‐‐‐TotalTime

‐‐‐

Inte‐

gration

Type

Code



Inte‐

gration

Time



Settling

Time

SE

with

no

Rev

DIFF

with

Input

Rev

250

_60Hz



_50Hz



250µs

16.67ms

20.00ms

200µs

3ms

≈0.7ms

≈20ms

≈23ms

≈1.4ms

≈40ms

≈46ms

Includes250μsforconversiontoengineeringunits.

AClinenoisefilter

3.4

INPUT‐NOISEVOLTAGE:ForDIFFmeasurementswithinput

reversalon±20mVinputrange(digitalresolutiondominatesfor

higherranges):250μsIntegration:0.4μVRMS,50/60Hz

Integration:0.19μVRMS



INPUTLIMITS:±5Vdc



DCCOMMON‐MODEREJECTION:>100dB



NORMAL‐MODEREJECTION:70dB@60Hzwhenusing60Hz

rejection



INPUTVOLTAGERANGEW/OMEASUREMENTCORRUPTION:±8.6

Vdcmax.



SUSTAINED‐INPUTVOLTAGEW/ODAMAGE:±16Vdcmax.



INPUTCURRENT:±1nAtypical,±6nAmax.@50°C;±120nA@

85°C



INPUTRESISTANCE:20GΩtypical



ACCURACYOFBUILT‐INREFERENCEJUNCTIONTHERMISTOR(for

thermocouplemeasurements):

±0.3°C,‐25°to50°C

±0.8°C,‐55°to85°C(‐XTonly)

4.0

ANALOGOUTPUTS(VX1–4,IX1–3,CAO1–2)

4.0.1‐‐30

Fourswitchedvoltageandthreeswitchedcurrentoutputs

sequentiallyactiveonlyduringmeasurement.Twocontinuous

outputs.

4.0.2

RANGESANDRESOLUTION:

4.1‐‐30



Chan‐

nel



Range



Res‐

olution

Current

Source

/Sink

Compli‐

ance

Voltage

VX1–4 ±5Vdc 0.17mV ±50mA N/A

IX1–3 ±2.5mA 0.08µA N/A ±5Vdc

CAO1–2 ±5Vdc 0.17mV ±15mA N/A

4.2‐‐30

ANALOGOUTPUTACCURACY(VXandCAO):

±(0.04%ofsetting+0.5mV,0°to40°C

±(0.07%ofsetting+0.5mV,‐25°to50°C

±(0.09%ofsetting+0.5mV,‐40°to85°C(‐XTonly)

4.3‐‐30

ANALOGOUTPUTACCURACY(IX)

±(0.1%ofsetting+0.5µA,0°to40°C

±(0.13%ofsetting+0.5µA,‐25°to50°C

±(0.15%ofsetting+0.5µA,‐40°to85°C(‐XTonly)

4.4

VXFREQUENCYSWEEPFUNCTION:Switchedoutputsprovidea

programmablesweptfrequency,0to5000mVsquarewavesfor

excitingvibratingwiretransducers.



3.5.0

PERIODAVERAGE

3.5.0a

Anyofthe28SEanaloginputscanbeusedforperiod

averaging.Accuracyis±(0.01%ofreading+resolution),where

resolutionis68nsdividedbythespecifiednumberofcyclesto

bemeasured.

INPUTAMPLITUDEANDFREQUENCY:

3.5.1‐‐30



Volt‐

Input

Signal

Peak‐Peak



Min

Pulse



Max

age

Gain

Range

Code

Min



Max



Width

µs

Freq

kHz



1

5

20

50

mV1000

mV200

mV50

mV20

200

20

5

2

10

2

2.5

5.0

10.0

100

200

100

50

20

SignaltobecenteredaroundThreshold(seePeriodAvg()

instruction).

Signaltobecenteredaroundground.

Themaximumfrequency=1/(twiceminimumpulsewidth)

for50%ofdutycyclesignals.

5.0

RATIOMETRICMEASUREMENTS

5.1‐‐30

MEASUREMENTTYPES:TheCR3000providesratiometric

resistancemeasurementsusingvoltageorcurrentexcitation.

Fourswitchedvoltageexcitationoutputsareavailablefor

measurementoffour‐andsix‐wirefullbridges,andtwo‐,

three‐,andfour‐wirehalfbridges.Threeswitchedcurrent

excitationoutputsareavailablefordirectresistance

measurements.Optionalexcitationpolarityrevers

alminimizes

dcerrors.

5.2‐‐30

RATIOMETRICMEASUREMENTACCURACY

9,10,11

:



±(0.02%ofVoltageMeasurement+Offset

),0°to40°C

±(0.025%ofVoltageMeasurement+Offset

),─25°to50°C

±(0.03%ofVoltageMeasurement+Offset

),─40°to85°C(‐

XT)

5.2.1

Accuracyspecificationassumesexcitationreversalfor

excitationvoltages<500mVandexcitationcurrents<500µA.

Assumptiondoesnotincludebridgeresistorerrorsandsensor

andmeasurementnoise.

ForResistance()instruction,thesensorresistanceis

determinedfromV



/I

,whereexcitationcurrentI

is

measuredacrossa1000Ω,±0.005%at25˚C,2ppm•˚C

‐1

TCR

internalresistor.

Estimatedaccuracy,∆X(whereXisvaluereturnedfrom

measurementwithMultiplier=1,Offset=0):

BRHalf()Instruction:∆X=∆V

1/

.

BRFull()Instruction

:

∆X=1000x∆V

,expressedasmV•V

‐1

.

Note∆V

iscalculatedfromtheratiometricmeasurement

accuracy.SeemanualsectionResistanceMeasurements

(p.

300)formoreinformation.

Offsetdefinitions:

Offset=1.5xBasicRes+1.0µV(forDIFFmeasurementw/

inputreversal)

Offset=3xBasicRes+2.0µV(forDIFFmeasurementw/o

inputreversal)

Offset=3xBasicRes+5.0µV(forSEmeasurement)

NoteExcitationreversalreducesoffsetsbyafactoroftw

o.

6.0

PULSECOUNTERS(P1–4)

6.0.1

Fourinputsindividuallyselectableforswitchclosure,high

frequencypulse,orlow‐levelac.Independent24‐bitcounters

foreachinput.

6.1

MAXIMUMCOUNTSPERSCAN:16.8x10



6.2

SWITCH‐CLOSUREMODE:

MinimumSwitchClosedTime:5ms

MinimumSwitchOpenTime:6ms

Max.BounceTime:1msopenwithoutbeingcounted

6.3

HIGH‐FREQUENCYPULSEMODE:

Maximum‐InputFrequency:250kHz

Maximum‐InputVoltage:±20V

VoltageThresholds:Countupontransitionfrombelow0.9Vto

above2.2Vafterinputfilterwith1.2μstimeconstant.

6.4

LOW‐LEVELACMODE:Internalaccouplingremovesdcoffsets

upto±0.5Vdc.

InputHysteresis:12mVRMS@1Hz

Maximumac‐InputVoltage:±20V

Minimumac‐InputVoltage:

6.4.1

Sinewave(mVRMS) Range(Hz)

20

200

2000

5000

1.0to20

0.5to200

0.3to10,000

0.3to20,000

7.0

DIGITALI/OPORTS(C1‐8,SDM1‐3)

7.0.1

Eightportssoftwareselectableasbinaryinputsorcontrol

outputs.Provideon/off,pulsewidthmodulation,edgetiming,

subroutineinterrupts/wakeup,switch‐closurepulsecounting,

high‐frequencypulsecounting,asynchronouscommunications

(UARTs),andSDI‐12communications.

7.0

DIGITALI/OPORTS(C1‐8,SDM1‐3)

7.0.1

Eightportssoftwareselectableasbinaryinputsorcontrol

outputs.Provideon/off,pulsewidthmodulation,edgetiming,

subroutineinterrupts/wakeup,switch‐closurepulsecounting,

high‐frequencypulsecounting,asynchronouscommunications

(UARTs),andSDI‐12communications.

7.1

LOWFREQUENCYMODEMAX:<1kHz

7.2

HIGHFREQUENCYMODEMAX:400kHz

7.3

SWITCH‐CLOSUREFREQUENCYMAX:150Hz

7.5

OUTPUTVOLTAGES(noload):high5.0V±0.1V;lo w<0.1V

7.6

OUTPUTRESISTANCE:330Ω

7.7

INPUTSTATE:high3.8to16V;low‐8.0to1.2 V

7.8

INPUTHYSTERISIS:1.4V

7.9

INPUTRESISTANCE:

100kΩwithinputs<6.2Vdc

220Ωwithinputs≥6.2Vdc

7.10

SERIALDEVICE/RS‐232SUPPORT:0to5VdcUART

7.11‐‐30

ADDITIONALDIGITALPORTS:SDM‐C1,SDM‐C2,SDM‐C3are

dedicatedformeasuringSDMdevices.

7.12

SWITCHED12Vdc(SW12V)

Twoindependent12Vdcunregulatedterminalsswitchedonand

offunderprogramcontrol.Thermalfuseholdcurrent=900mA

at20°C,650mAat50°C,and360mAat85°C.

8.0

CECOMPLIANCE

8.1

STANDARD(S)TOWHICHCONFORMITYISDECLARED:

IEC61326:2002

9.0

COMMUNICATION

9.1

RS‐232PORTS:

DCEnine‐pin:(electricallyisolated)forcomputerconnectionor

connectionofmodemsnotmanufacturedbyCampbell

Scientific.

COM1toCOM4:fourindependentTx/Rxpairsoncontrolports

(non‐isolated);0to5VdcUART

BaudRate:selectablefrom300bpsto115.2kbps.

DefaultFormat:eightdatabits;onest

opbits;noparity.

OptionalFormats:sevendatabits;twostopbits;odd,even

parity.

9.2

CSI/OPORT:Interfacewithtelecommunicationsperipherals

manufacturedbyCampbellScientific.

9.3

SDI‐12:DigitalcontrolportsC1,C3,C5,C7areindividually

configurableandmeetSDI‐12Standardv.1.3fordatalogger

mode.UptotenSDI‐12sensorsaresupportedperport.

9.4‐‐30

PERIPHERALPORT:40‐pininterfaceforattachingCompactFlash

orEthernetperipherals.

9.5

PROTOCOLSSUPPORTED:PakBus,AES‐128EncryptedPakBus,

Modbus,DNP3,FTP,HTTP,XML,HTML,POP3,SMTP,Telnet,

NTCIP,NTP,WebAPI,SDI‐12,SDM.

10.0

SYSTEM

10.1

PROCESSOR:RenesasH8S2674(16‐bitCPUwith32‐bitinternal

corerunningat≈21.9MHz)

10.2

MEMORY:2MBofflashforoperatingsystem;4MBofbattery‐

backedSRAMforCPUusage,programstorage,andfinaldata

storage.

10.3

REAL‐TIMECLOCKACCURACY:±3min.peryear.Correctionvia

GPSoptional.

10.4

RTCCLOCKRESOLUTION:10ms

11.0

SYSTEMPOWERREQUIREMENTS

11.1

VOLTAGE:10to16Vdc

11.2‐‐30

INTERNALBATTERIES:1200‐mAhrlithiumbatteryforclockand

SRAMbackup.Typicallyprovides3yearsofbackup.Optional

10‐Ahralkalineor7‐Ahrrechargeablebattery+baseavailableas

primarypowersupply.

11.3

EXTERNALBATTERIES:Optional12Vdcnominalalkalineand

rechargeableavailable.Powerconnectionisreversepolarity

protected.

11.4

TYPICALCURRENTDRAINat12Vdc:

SleepMode:2mA

1HzSampleRate(onefastSEmeas.)3m3A

100HzSampleRate(onefastSEmeas.):10mA

100HzSampleRate(onefastSEmeas.withRS‐232

communications):38mA

Activeintegratedkeyboarddisplayadds1mA(42mAwith

backlighton).

12.0

PHYSICAL

12.1

DIMENSIONS:241x178x96mm(9.5x7.0x3.8in.);additional

clearancerequiredforcablesandleads.

12.2

MASS/WEIGHT:

12.2.1‐‐30

BaseType: Mass(kg) Weight(lbs)

LowProfBase 1.6 3.6

AlkalineBase 3.8 8.3

RechargeBase 4.8 10.7

13.0

WARRANTY

13.1

Warrantyisstatedinthepublishedpricelistandinopening

pagesofthisandotherusermanuals.



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