Campbell CDM-VW300 Series Instrukcja Obsługi Pobierz pdf (Strona 93)

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Appendix G. CRBasic Program Library

The following example programs are compatible with CR3000, CR1000, and

CR800 dataloggers without modification. The programs are available for

download at www.campbellsci.com/downloads. Look for "CDM-VW300

Example Programs." The programs are named with a .CR3 extension and can

be renamed as .CR1 or .CR8 without modification to run on the CR1000 or

CR800 dataloggers. To use programs from this library,

1. Select the desired program and save it to your PC.

2. Open CRBasic Editor.

3. Open the program file just downloaded to edit, if necessary.

4. Send the program to the datalogger using the program Send command

in RTDAQ or LoggerNet.

5. Monitor the operation of the system with the numeric and graphical

monitors available with RTDAQ or LoggerNet.

G.1 Dynamic Measurements

G.1.1 20 Hz Measurement Example — One CDM-VW300, Two

Channels

'===20Hz-1Device2Ch_4-25-13.CR3===

'CR3000 datalogger

'CDM-VW300 vibrating-wire analyzer

'Program to read 20 Hz dynamic data from one CDM-VW300 analyzer measuring two 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 '<<<<<<<<<<<<<<SET CPI ADDRESS HERE

Public Freq(2) 'dynamic frequencies

Public Diag(2) As Long 'diagnostic code

Public StaticFreq(2) 'Static (1 Hz output) frequencies

Public Therm(2) 'Thermistor readings

'Standard Deviation of the dynamic readings that occurred during the latest one-second interval

Public DynStdDev(2)

'The following arrays are used to configure the CDM-VW300. Refer to the CDM_VW300Config

'instruction used below

' CH1 CH2

' --- ---

'Set to true (Enabled=1, Disabled=0) only those channels which have sensors connected

Dim Enable(2) As Long = { 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(2) = { 0.002, 0.002}

'Low Frequency Boundary (sensor frequency should never fall below

'this value regardless of environmental changes)

Dim F_Low(2) = { 300, 300}

'High Frequency Boundary (sensor frequency should never exceed

'this value regardless of environmental changes)

Dim F_High(2) = { 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(2) As Long = { 0, 0}

'Multiplier (factor) to be applied to sensor output frequency

Dim Mult(2) = { 1.0, 1.0}

G-1

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