Campbell CDM-VW300 Series Manuál stáhnout pdf (Strana 112)

Appendix G. CRBasic Program Library

Dim OutForm(2) As Long = { 1, 1}

'Use a multiplier of 0.001 to divide by 1000 and get digits

'Then scale further to get to Strain

Dim Mult(2) = { 0.001*GageFactor*NomBatchFactor,

0.001*GageFactor*NomBatchFactor} 'Digits (Hz^2/1000) times G times B results in strain

Dim Off(2) = { 0.0, 0.0}

'Use Steinhart-Hart coefficients To get Thermistor output in DegC

Dim SteinA(2) = {1.4051E-3, 1.4051E-3}

Dim SteinB(2) = { 2.369E-4, 2.369E-4}

Dim SteinC(2) = { 1.019E-7, 1.019E-7}

Dim RFMB(2) As Long = { 20, 20}

Dim RFAB(2) As Long = { 20, 20}

Dim RFLL(2) = { 400.0, 400.0}

Dim RFHL(2) = {4000.0,4000.0}

Dim RFHY(2) = { 0.005, 0.005}

Dim RFOF(2) As Long = { 100, 100}

CDM_VW300Config(0,CPI_ADDR,0,Enable(),Max_AMP(),F_Low(),F_High(), _

OutForm(),Mult(),Off(), SteinA(),SteinB(),SteinC(), _

RFMB(),RFAB(),RFLL(),RFHL(),RFHY(),RFOF())

DataTable (static,true,-1)

DataInterval (0,1,Min,10)

CardOut (0 ,-1)

Average (2,StaticStrain(),IEEE4,False)

Average (2,Temp(),IEEE4,False)

Average (2,StrainStdDev(),IEEE4,False)

EndTable

DataTable (dynamic,true,-1)

CardOut (0 ,-1)

DataEvent (100,(Strain(1) > 200) OR (Strain(2) > 200),1,100)

Sample (2,Strain(),IEEE4)

Sample (2,DCode(),IEEE4)

EndTable

DataTable(CalHist,NewFieldCal,-1)

CardOut (0 ,-1)

SampleFieldCal

EndTable

BeginProg

'50 Hz/20msec scan rate

Scan(20,msec,500,0)

CDM_VW300Dynamic(CPI_ADDR,Strain(),DCode()) 'Get unshifted strain

'Now shift the given Strain using the Baseline/Offset value

Strain(1) = Strain(1) + StrainBL(1) : Strain(2) = Strain(2) + StrainBL(2)

'Zeroing calibration for Geokon 4000 Vibrating Wire Strain Gage

'Strain offset and Temperature baseline readings

FieldCal(0,Strain(),2,0,StrainBL(),ZeroMode,0,1,100) 'Calibrate for 2 seconds

FieldCal(4,Temp(),2,0,TempBL(),ZeroMode,0,1,100)

CallTable dynamic

CallTable CalHist

If TimeIntoInterval (0,1,Sec) Then

CDM_VW300Static(CPI_ADDR,StaticStrain(),Temp(),StrainStdDev()) 'Obtain un-shifted static

'strain

'Calculate static digits reading (for troubleshooting)

StaticDigits(1) = StaticStrain(1)/GageFactor/NomBatchFactor

StaticDigits(2) = StaticStrain(2)/GageFactor/NomBatchFactor

'Now shift the given StaticStrain using the Offset/Baseline reading to obtain

'final/adjusted StaticStrain

StaticStrain(1) = StaticStrain(1) + StrainBL(1) : StaticStrain(2) = StaticStrain(2) + _

StrainBL(2)

'Calculate static frequency from static digits (for troubleshooting)

StaticFreq(1) = SQR(StaticDigits(1)*1000) : StaticFreq(2) = SQR(StaticDigits(2)*1000)

CallTable static

EndIf

NextScan

EndProg

G-20

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