Campbell CDM-VW300 Series Manuál stáhnout pdf (Strana 113)

Appendix G. CRBasic Program Library

G.1.13 50 Hz Measurement Example — One CDM-VW300, Two

Geokon 4000 Sensors with FieldCal() and TableFile() to

'===Geokon4000-50Hz2ChEventTableFile_4-25-13.CR3===

'CR3000 datalogger

'CDM-VW300 vibrating-wire analyzer

'Program to read 50-Hz dynamic data from one CDM-VW300 measuring two Geokon 4000 strain gages.

'Write data to CF card at each event.

'Demonstrate use of TableFile() with Option 64, DataEvent(), and DataInterval() to conserve

' data storage.

'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 calibration 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)

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

Public NewDynFileStored As Boolean 'Needed for TableFile

Public NewStaticFileStored As Boolean 'True when a new file was just created on the card

Public LastDynFileName As String * 35 'The name of the new file just created on the card

Public LastStaticFileName As String * 35

'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 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)

'Even though data is observed once per second,

'write out 1 minute averages

G-21

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 121 122

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