Campbell Scientific CDM-VW300 Series Dynamic Vibrating-Wire Analyzer System - Manual (Page 116)

Appendix G. CRBasic Program Library
Sample (2,Diag(),IEEE4)
EndTable
BeginProg
'100 Hz/10msec scan rate
Scan (10,msec,500,0)
CDM_VW300Dynamic (CPI_ADDR,Freq(),Diag()) 'Get dynamic readings
CallTable dynamic
If TimeIntoInterval (0,1,Sec) Then 'Process static data only once per second
CDM_VW300Static (CPI_ADDR,StaticFreq(),Therm(),DynStdDev()) 'Get static readings
CallTable static
EndIf
NextScan
EndProg
G.1.15 100 Hz Measurement Example — One CDM-VW305, Eight
Channels
'===100Hz-1Device8Ch_4-25-13.CR3===
'CR3000 datalogger
'CDM-VW305 vibrating-wire analyzer
'Program to read 100-Hz dynamic data from one CDM-VW305 analyzer measuring eight channels
'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 '<<<<<<<<<<<<<
Public Freq(8) 'dynamic frequencies
Public Diag(8) As Long 'diagnostic code
Public StaticFreq(8) 'Static (1Hz output) frequencies
Public Therm(8) 'Thermistor readings
'Standard Deviation of the dynamic readings that occurred during the latest one-second interval
Public DynStdDev(8)
'The following arrays are used to configure the CDM-VW300 series device. Refer to the
'CDM_VW300Config instruction used below.
'
' CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
' --- --- --- --- --- --- --- ---
'Set to true (Enabled=1, Disabled=0) only those channels which have sensors connected.
Dim Enable(8) As Long = { 1, 1, 1, 1, 1, 1, 1, 1}
'Specify the target/desired resonant amplitude at which the sensor will be maintained
'via excitation, given in volts. This should be in the range 0.010 to 0.001.
Dim Max_AMP(8) = { 0.002, 0.002, 0.002, 0.002, 0.002, 0.002, 0.002, 0.002}
'Low Frequency Boundary (sensor frequency should never fall below
'this value regardless of environmental changes).
Dim F_Low(8) = { 300, 300, 300, 300, 300, 300, 300, 300}
'High Frequency Boundary (sensor frequency should never exceed
'this value regardless of environmental changes).
Dim F_High(8) = { 6000, 6000, 6000, 6000, 6000, 6000, 6000, 6000}
'Output Format - Hz vs. Hz^2 :: Value of 0 – measured frequency is given in units of Hz,
'Value of 1 – measured frequency is squared and given in units of Hz^2
Dim OutForm(8) As Long = { 0, 0, 0, 0, 0, 0, 0, 0}
'Multiplier (factor) to be applied to sensor output frequency
Dim Mult(8) = { 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0}
'Offset (shift) to be applied to sensor output frequency
Dim Off(8) = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}
'Steinhart-Hart coefficients [A,B,C] for converting thermistor ohms to
'temperature in Celsius. Specifying zeroes for A,B,C results in a reading in Ohms.
Dim SteinA(8) = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}
Dim SteinB(8) = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}
Dim SteinC(8) = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}
'Rainflow configuration (not used in this program, but required as configuration arguments)
Dim RFMB(8) As Long = { 20, 20, 20, 20, 20, 20, 20, 20}
Dim RFAB(8) As Long = { 20, 20, 20, 20, 20, 20, 20, 20}
Dim RFLL(8) = { 400.0, 400.0, 400.0, 400.0, 400.0, 400.0, 400.0, 400.0}
G-24