Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 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
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