Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 107)

Appendix G. CRBasic Program Library
DataTable (dynamic,true,-1)
Sample (8,Freq(),IEEE4)
Sample (8,Diag(),IEEE4)
EndTable
'Store Rainflow-Histogram Output
DataTable (rainflhist,true,-1)
RainflowSample (RF1(),IEEE4)
RainflowSample (RF2(),IEEE4)
RainflowSample (RF3(),IEEE4)
RainflowSample (RF4(),IEEE4)
RainflowSample (RF5(),IEEE4)
RainflowSample (RF6(),IEEE4)
RainflowSample (RF7(),IEEE4)
RainflowSample (RF8(),IEEE4)
EndTable
BeginProg
'50 Hz/20msec scan rate
Scan (20,msec,500,0)
CDM_VW300Dynamic (CPI_ADDR,Freq(),Diag())
CallTable dynamic
If TimeIntoInterval (0,1,Sec) Then
CDM_VW300Static (CPI_ADDR,StaticFreq(),Therm(),DynStdDev())
CallTable static
EndIf
NextScan
SlowSequence
Scan (5,sec,10,0)
'Rainflow-Histogram call must be in a slow sequence scan
CDM_VW300Rainflow (CPI_ADDR,RF1(),RF2(),RF3(),RF4(),RF5(),RF6(),RF7(),RF8())
CallTable rainflhist
NextScan
EndProg
G.1.10 50 Hz Diagnostic Example — One CDM-VW300, Two
Geokon 4000 Sensors with FieldCal()
'===Geokon4000-50Hz2ChDiags_4-25-13.CR3===
'CR3000 datalogger
'CDM-VW300 vibrating-wire analyzer
'Program to read 50-Hz diagnostic data from one CDM-VW300 analyzer measuring two Geokon 4000
'strain gages.
'Diagnostic code evaluation example -- use counters to track diagnostic flag counts.
'IMPORTANT -- Ensure that the CPI address coded on the following line matches the address
'reported for the attached analyzer in the DevConfig or DVWTool software.
Const CPI_ADDR = 1 '<<<<<<<<<<<<<<SET CPI ADDRESS HERE
'Constants specific to the Geokon 4000 strain gages
Const GageFactor = 4.062 'G = 4.062 - Gage factor taken from sensor manual
Const NomBatchFactor = 0.97 'B=0.97 - Batch Factor taken from cal sheet provided with sensors
'Output will be in Strain, not Digits nor Frequency
Public Strain(2) : Units Strain() = Microstrain 'Measured strain output in units of Microstrain
Public StrainBL(2) : Units Strain() = Microstrain 'Baseline/offset strain reading in units of
'Microstrain (for calibration)
Public DCode(2) As Long 'Dynamic diagnostic code
Public StaticStrain(2) : Units StaticStrain() = Microstrain 'Static (1Hz) strain reading in
microstrain
Public StaticDigits(2) 'Calculated Static (1Hz) Digits output (for troubleshooting)
Public StaticFreq(2) : Units StaticFreq) = Hz 'Calculated Frequency (1Hz) from static
'digits ( for troubleshooting).
G-15