Campbell CR850 User Manual

79

Section 6. CR800 Specifications
1.1
CR800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1–6,DIFF1–3)
3.0.1
Threedifferential(DIFF)orsix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.
425)conversion.ADIFFmeasurementwithinputreversalhas
better(finer)resolutionbytwicethanBasicRes.
3.1.1‐‐810

Range(mV)
1

DIFF
Res(μV)
2

Basic
Res(μV)
±5000
±2500
±250
±25
±7.5
±2.5
667
333
33.3
3.33
1.0
0.33
1333
667
66.7
6.7
2.0
0.67
1
Rangeoverheadof≈9%onallrangesguaranteesfull‐scale
voltagewillnotcauseover‐range.
2
ResolutionofDIFFmeasurementswithinputreversal.
3.2‐‐810
ANALOGINPUTACCURACY
3
:
±(0.06%ofreading+offset
3
),0°to40°C
±(0.12%ofreading+offset
3
),‐25°to50°C
±(0.18%ofreading+offset
3
),‐55°to85°C(‐XTonly)
3.2.1
3
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+3.0µV(forSEmeasurement)
3.3
ANALOGMEASUREMENTSPEED:
3.3.1‐‐810
‐‐‐TotalTime
4
‐‐‐
Inte‐
gration
Type
Code

Inte‐
gration
Time


Settling
Time
SE
with
no
Rev
DIFF
with
Input
Rev
250
_60Hz
5

_50Hz
5

250µs
16.67ms
20.00ms
450µs
3ms
3ms
≈1ms
≈20ms
≈25ms
≈12ms
≈40ms
≈50ms
4
Includes250μsforconversiontoengineeringunits.
5
AClinenoisefilter
3.4
INPUT‐NOISEVOLTAGE:ForDIFFmeasurementswithinput
reversalon±2.5mVinputrange(digitalresolutiondominatesfor
higherranges):
250μsIntegration:0.34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;±90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1–2)
4.0.1‐‐8
Twoswitchedvoltageoutputssequentiallyactiveonlyduring
measurement.
4.0.2
RANGESANDRESOLUTION:
4.1‐‐810


Channel


Range

Resolu‐
tion
Current
Source
/Sink
(VX1–2) ±2.5Vdc 0.67mV ±25mA
4.2‐‐810
ANALOGOUTPUTACCURACY(VX):
±(0.06%ofsetting+0.8mV,0°to40°C
±(0.12%ofsetting+0.8mV,‐25°to50°C
±(0.18%ofsetting+0.8mV,‐55°to85°C(‐XTonly)
4.4
VXFREQUENCYSWEEPFUNCTION:Switchedoutputsprovidea
programmablesweptfrequency,0to2500mVsquarewavesfor
excitingvibratingwiretransducers.

3.5.0
PERIODAVERAGE
3.5.0a
Anyofthe6SEanaloginputscanbeusedforperiodaveraging.
Accuracyis±(0.01%ofreading+resolution),whereresolution
is136nsdividedbythespecifiednumberofcyclestobe
measured.
INPUTAMPLITUDEANDFREQUENCY:
3.5.1‐‐810


Volt‐
Input
Signal
Peak‐Peak

Min
Pulse


Max
age
Gain
Range
Code
Min
mV
6

Max
V
7

Width
µs
Freq
kHz
8

1
10
33
100
mV250
mV25
mV7_5
mV2_5
500
10
5
2
10
2
2
2
2.5
10
62
100
200
50
8
5
6
SignaltobecenteredaroundThreshold(seePeriodAvg()
instruction).
7
Signaltobecenteredaroundground.
8
Themaximumfrequency=1/(twiceminimumpulsewidth)
for50%ofdutycyclesignals.
5.0
RATIOMETRICMEASUREMENTS
5.1‐‐810
MEASUREMENTTYPES:TheCR800providesratiometric
resistancemeasurementsusingvoltageexcitation.Three
switchedvoltageexcitationoutputsareavailablefor
measurementoffour‐andsix‐wirefullbridges,andtwo‐,
three‐,andfour‐wirehalfbridges.Optionalexcitationpolarity
reversalminimizesdcerrors.
5.2‐‐810
RATIOMETRICMEASUREMENTACCURACY
9,11

NoteImportantassumptionsoutlinedinfootnote9:

±(0.04%ofVoltageMeasurement+Offset
12
)
5.2.1
9
Accuracyspecificationassumesexcitationreversalfor
excitationvoltages<1000mV.Assumptiondoesnotinclude
bridgeresistorerrorsandsensorandmeasurementnoise.
11
Estimatedaccuracy,∆X(whereXisvaluereturnedfrom
measurementwithMultiplier=1,Offset=0):
BRHalf()Instruction:∆X=∆V
1/
V
X
.
BRFull()Instruction
:
∆X=1000x∆V
1/
V
X
,expressedasmV•V
‐1
.
Note∆V
1
iscalculatedfromtheratiometricmeasurement
accuracy.SeemanualsectionResistanceMeasurements
(p.
291)formoreinformation.
12
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+3.0µV(forSEmeasurement)
NoteExcitationreversalreducesoffsetsbyafactoroftw
o.
6.0
PULSECOUNTERS(P1–2)
6.0.1
Two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:16.7x10
6

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:Intern al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1‐4)
7.0.1
Four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.SDMcommunications
arealsosupported.
7.0
DIGITALI/OPORTS(C1‐4)
7.0.1
Four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.SDMcommunicationsare
alsosupported.
7.1
LOWFREQUENCYMODEMAX:<1kHz
7.2
HIGHFREQUENCYMODEMAX:400kHz
7.3
SWITCH‐CLOSUREFREQUENCYMAX:150Hz
7.4
EDGE‐TIMINGRESOLUTION:
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

7.12
SWITCHED12Vdc(SW12)
Oneindependent12Vdcunregulatedterminal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:(notelectricallyisolated)forcomputerconnection
orconnectionofmodemsnotmanufacturedbyCampbell
Scientific.
COM1toCOM2:two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areindividuallyconfigurable
andmeetSDI‐12Standardv.1.3fordataloggermode.Uptoten
SDI‐12sensorsaresupportedperport.

9.5
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2322(16‐bitCPUwith32‐bitinternal
corerunningat7.3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:9.6to16Vdc
11.2‐‐810
INTERNALBATTERY:1200mAhrlithiumbatteryforclockand
SRAMbackup.Typicallyprovidesthreeyearsofback‐up.

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:0.7mAtypical;0.9mAmaximum
1HzSampleRate(onefastSEmeas.)mA
100HzSampleRate(onefastSEmeas.):16mA
100HzSampleRate(onefastSEmeas.withRS‐232
communications):28mA
Activeexternalkeyboarddisplayadds7mA(
100mAwith
backlighton).
12.0
PHYSICAL
12.1
DIMENSIONS:241x104x51mm(9.5x4.1x2in.);additional
clearancerequiredforcablesandleads.
12.2
MASS/WEIGHT:0.7kg/1.5lbs
13.0
WARRANTY
13.1
Warrantyisstatedinthepublishedpricelistandinopening
pagesofthisandotherusermanuals.




Campbell CR850 Specifications

General

Brand	Campbell
Model	CR850
Category	Measuring Instruments
Language	English