Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 108)

Appendix G. CRBasic Program Library
Public Temp(2) : Units Temp() = DegC ' Temperature in DegC
Public TempBL(2) : Units TempBL() = DegC ' Temperature Baseline in DegC
Public StrainStdDev(2) : Units StrainStdDev() = Microstrain 'StdDev of dynamic strain readings
Public ZeroMode 'Mode variable for baseline/offset zeroing calibration
'Diagnostic Code flags
Public ExciteStr(2) : Units ExciteStr() = Volts 'Excitation strength on the VW channel in volts
Const VoltFactor = 1/42.5 'For converting 0-255 range of excitation into 0 to 6V
Public LowAmpCount(2) As Long
Public HighAmpCount(2) As Long
Public LowFreqCount(2) As Long
Public HighFreqCount(2) As Long
Public ResetCounts As Boolean
'Configure the CDM-VW300 device
Dim Enable(2) As Long = { 1, 1}
Dim Max_AMP(2) = { 0.002, 0.002}
Dim F_Low(2) = { 300, 300}
Dim F_High(2) = { 6000, 6000}
'Use Hz^2 (1) instead of Hz (0) so we can get to digits
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 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)
Sample (2,StaticStrain(),IEEE4)
Sample (2,Temp(),IEEE4)
Sample (2,StrainStdDev(),IEEE4)
EndTable
DataTable (slow,true,-1)
DataInterval (0,1,Min,10)
Average (2,StaticStrain(),IEEE4,False)
Average (2,Temp(),IEEE4,False)
Average (2,StrainStdDev(),IEEE4,False)
Average (2,ExciteStr(),IEEE4,False)
Sample (2,LowAmpCount(),UINT2)
Sample (2,HighAmpCount(),UINT2)
Sample (2,LowFreqCount(),UINT2)
Sample (2,HighFreqCount(),UINT2)
EndTable
DataTable (dynamic,true,-1)
Sample (2,Strain(),IEEE4)
Sample (2,DCode(),IEEE4)
Sample (2,ExciteStr(),IEEE4)
EndTable
DataTable(CalHist,NewFieldCal,-1)
SampleFieldCal
EndTable
BeginProg
'50 Hz/20msec scan rate
Scan (20,msec,500,0)
CDM_VW300Dynamic (CPI_ADDR,Strain(),DCode()) 'Get unshifted strain
G-16